JP2003010920A - Manufacturing method for multi-blade fans - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To efficiently manufacture a plurality of constituent pieces from a base material of one strip-shaped metal plate by progressive processing. SOLUTION: After a plurality of component pieces 11 are cut and formed at a predetermined pitch from a base material 16 of a single band-shaped metal plate and formed, a connecting portion 19 connecting the component pieces 11 is moved in a counter-feed direction. The return bending step of forming the bent overlapping portion 22 in the upright state at the connecting portion 19 is continuously manufactured by progressive press working.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a multi-blade fan or the like, which is formed by arranging a large number of constituent pieces in a cylindrical shape.

[0002]

2. Description of the Related Art Conventionally, various improvements have been attempted with respect to, for example, a method for manufacturing a multi-blade fan, but the method is still not always satisfactory and a more efficient manufacturing method is required. For example, in a method for manufacturing a multi-blade fan disclosed in Japanese Patent Laid-Open No. 6-212299, a manufacturing method excellent in workability is shown by adopting progressive press working. That is, referring to FIG. 14 and FIG. 15, a large number of blade pieces 4 as constituent pieces connected to each other from the base material 1 made of one strip-shaped metal plate by the connecting portions 2 and 3 at both side edge portions. In addition to the cutting and bending, particularly in the eighth station S8, substantially V-shaped bent portions 2a and 3a are formed in the connecting portions 2 and 3.

As a result, the distance P1 between the blade pieces 4 is reduced to the distance P
The blade connecting body 5 shortened to 2 is formed, and the fan main portion 6 cut to a predetermined length is obtained. Then, thereafter, the fan main portions 6 are arranged in a cylindrical shape and joined by caulking to an outer peripheral portion of a separately formed circular main plate 7, and an annular protection ring 8 is attached to one end shown in the drawing by a roller caulking. Therefore, a multi-blade fan integrated in a cylindrical shape was assembled and manufactured.

As described above, in the above-described manufacturing method, since a large number of blade pieces 4 need to be formed in order to obtain the fan main portion 6 of a predetermined length, each blade piece 4 initially formed at the progressive pitch interval P1. This is dealt with by forming the substantially V-shaped bent portions 2a and 3a in order to shorten the interval (interval P2). As a result, the bent portions 2a and 3a simply move up and down, and can be easily processed by using the lower die to enable press work by progressive feeding. Therefore, according to the above method, the fan main body of a predetermined length can be manufactured. It is thought that it can be efficiently manufactured by progressive processing until the part 6 is obtained.

[0005]

However, the V-shaped bent portions 2a and 3a have a limit in forming the V-shape into a more acute shape in terms of molding, and therefore the shortening interval is more than that. It will be difficult to do. In addition, since this V-shaped shape is likely to undergo expansion / contraction deformation and is likely to lose its balance, care must be taken in handling from conveyance to assembly until finally forming the multi-blade fan. Furthermore, even when the protection ring 8 is caulked and fixed, the one V-shaped bent portion 3a becomes an obstacle, and therefore the L-shaped protrusion 9 for caulking is provided.
It was undeniable that the workability was impaired due to the complicated shape such as the formation of protrusions and the troublesome handling.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to manufacture a multi-blade fan or the like capable of reliably and efficiently manufacturing a plurality of component pieces at predetermined intervals by progressive machining. There is a way to provide.

[0007]

In order to achieve the above object, a method for manufacturing a multi-blade fan or the like according to the present invention comprises a press work for intermittently feeding a base material of one strip metal plate at a predetermined pitch. After the step of cutting and forming a plurality of component pieces, and the step of forming a connecting portion that connects each component piece to each other, a return bending step of forming a bending overlap portion at the connecting portion between each component piece is performed. In the manufacturing method to be performed, in the return bending step, when the intermittent feeding of the base material is stopped, the connecting portion is moved in a counter-feeding direction, and an upright bent overlap portion is formed in the connecting portion. This is characterized in that (the invention of claim 1).

[0008] According to such means, the folded and overlapped portion can be formed in the connecting portion by the return bending step, the interval between the component pieces can be sufficiently adjusted (shortened), and the step is sequentially carried out. This is not possible by utilizing the intermittent stoppage, so not only can it be manufactured efficiently by progressive machining,
It is suitable for manufacturing a multi-blade fan and the like because it can surely obtain a bent overlap portion having a required shape and size, is excellent in workability, is advantageous in cost reduction, and can ensure desired air blowing performance.

In the manufacturing method according to the first aspect of the present invention, in the return bending step, the front and rear ends excluding the connecting portion forming the bent overlap portion are clamped and fixed by a mold, and the return mold in which the front end is fixed is fixed. It is characterized in that it is moved in the anti-feed direction (the invention of claim 2).

According to such means, since the front and rear ends are clamped and fixed by the mold, only the connecting portion in the unconstrained state in the middle is surely bent, and an effective bent overlap portion can be obtained. . Further, the return die can be used in a progressive press working apparatus and can be put to practical use, and at the same time, the intended purpose can be reliably achieved when manufacturing a multi-blade fan or the like.

Further, in the manufacturing method according to claim 1 or 2, at least a part of the bent and overlapped portion has an inclined shape (invention of claim 3).

According to such means, the bent and overlapped portion can be surely bent and formed, and the return deformation can be suppressed. Further, even if the overlapped and overlapped portion has a large overlapped dimension, it is inclined to reduce the standing dimension. As a result, the size of the mold can be kept low in the height direction, and the mold apparatus can be kept compact.

Further, in the manufacturing method according to claim 2,
It is characterized in that it has a preliminary bending step for orienting a bending overlap at the connecting portion, which is in the preceding stage of the back bending step (the invention of claim 4).

According to such means, since the bending direction is determined in advance before proceeding to the return bending step, it is possible to smoothly perform the return bending step and obtain a uniform bent overlap portion. In this preliminary bending step, it is possible to easily form because the direction of the bending and folding in the next step can be oriented by forming a slight bending portion.

Further, in the manufacturing method according to claim 4, the bending portion height h in the pre-bending step is set in a range of 0 <h ≦ plate thickness × 2 times (the invention of claim 5). ).

According to such means, by setting the bending height h in the above range, the extension of the metal material is taken into consideration, and this slight pre-bending is excessive against the base material particularly in the subsequent steps. It is possible to prevent excessive tension and external force from being applied to the mold, so it can be suppressed within the allowable range that does not affect the shape of the multi-blade fan or its manufacturing process.
It is possible to properly perform progressive processing at an appropriate position.

Further, in the manufacturing method according to claim 2, in the returning operation of the returning mold after the returning bending step, the returning lower mold is lowered to form a gap, and then the returning upper mold is moved to return. This is characterized in that (the invention of claim 6).

According to such means, at the front end portion of the connecting portion which is sandwiched and fixed to the return mold, the return lower mold is released during the return operation of the return mold, and then the return upper mold is returned. Since this is performed, no external force acts such that the joint portion that has been bent and folded once and shortened follows the return movement of the upper mold, and an effective bent and folded portion can be secured.

Further, in the manufacturing method according to the sixth aspect, the operation is performed when the return die is returned, and when a gap is formed between the upper die and the lower die of the die, the gap is temporarily held. The present invention is characterized in that it has a gap holding means for carrying out the invention (the invention of claim 7).

According to such means, it is possible to maintain the gap for a required time during continuous press working, and to perform the return operation reliably, and to perform a reliable progressive feed. Processing can be provided.

Further, in the manufacturing method according to claim 3,
A crushing step is provided after the return bending step, and the crushing step is characterized in that the upper and lower molds press the bent and overlapped portion to fold it (the invention of claim 8).

According to such means, the bent and overlapped portion can be easily folded in the direction of its inclination by a simple vertical movement of the upper and lower dies, and a large pressing force is not required, so that at the same time as other processing. It can be performed and can be applied reasonably to progressive machining.

Further, in the manufacturing method according to claim 8, the collapsing portion in the collapsing step is formed in an arc shape along a cylindrical outer diameter shape of a multi-blade fan or the like (the invention of claim 8). ).

According to such means, when a multi-blade fan or the like is formed into a cylindrical shape, the free end side which is the tip of the arcuate fold portion along the same shape separates to form a gap. It is possible to form a folded portion that is strong and has a good appearance, and when the protective ring is attached to the end portion in a fitted state, the end portion does not project away from the end portion, so the attaching work ( It also has the advantage that it can be easily crimped.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a multi-blade fan used for a blower such as a range hood will be described below with reference to FIGS. First, FIG.
1 is a perspective view of a multi-blade fan, and as shown in the drawing, a fan main portion 12 in which a large number of arc-shaped blade pieces 11 as constituent pieces are arranged in a cylindrical shape, and an inner side of the fan main portion 12 It is composed of a disk-shaped main plate 13 that is mounted closer to the lower end of the drawing from the intermediate position, and annular protective rings 14 that are mounted on the upper and lower ends of the fan main portion 12, respectively.

The boss portion 1 is provided at the center of the main plate 13.
5, a rotary shaft of a motor (not shown) is fitted and attached. Further, the protective ring 14 is not always necessary, but in practical use, in terms of handling a multi-blade fan,
The upper and lower end portions of the fan main portion 12 are concealed in consideration of the safety of injuries and the like, which also contributes to increasing the strength of the entire multi-blade fan.

Therefore, FIG. 1 shows a process in which a large number of blade pieces 11 described above are formed from a base material 16 which is a strip-shaped metal plate so as to be integrally connected by progressive press working. Of these, FIG. 11A is a plan view, while FIG. 11B is a side view and FIG. 11C shows a stepwise process of processing in an eighth station S8 described later. Therefore, although detailed description will be given later, in this progressive press working, the fan main portion 12 in a state of being cut into a predetermined length which constitutes the multi-blade fan is continuously manufactured.

That is, in the progressive press working apparatus, the base material 16 is moved in the direction of arrow A through the roller feed 17.
It is processed by intermittently feeding pitch by pitch. Among them, first, in the first station S1, circular pilot holes 18 are punched out at both side edges of the base material 16 in the width direction, and when the base material 16 is fed by one pitch, the pilot holes 18 are fitted to pilot pins (not shown). By matching, the base material 16 is positioned.

Then, in the second station S2, the base material 16 is cut at an interval of one pitch along the outer shape of the blade piece 11 leaving both side edges in the width direction, and in the next third station, The blade piece 11 starts to be cut and raised upward. Subsequently, in the fourth and fifth stations, the secondary molding and final molding of the blade pieces 11 that have been cut and raised are sequentially performed, and the blade pieces 11 are sequentially bent into an arc shape while increasing the rising angle with respect to the base material 16. .

Then, at the sixth station S6, both side edges of the base material 16 in the width direction are trimmed including the pilot holes 18. At this time, the narrow connecting portions 19 are provided on both side edges.
Then, the edges are cut off so that the protruding pieces 20 protruding outward are left at intervals corresponding to one pitch. In addition, this protrusion 2
0 is unnecessary for constructing the multi-blade fan, and will be finally cut and removed as will be described later.

Next, the seventh station S7 and the eighth station
In the station S8, the bending process is performed in the connecting portion 19, and first, in the seventh station S7, a preliminary bending is performed so as to be slightly bent upward to form a mountain shape (preliminary bending portion 21), and then the eighth station. In S8, the bent overlap portion 22 bent upward is formed based on the orientation by the preliminary bending portion 21. This bent overlap portion 22
Are bent and overlapped in a substantially contact state, and in the present embodiment, the free end which is the tip is formed in an upright state in which the free end is inclined toward the feed direction. As a result, the initial spacing P1 of the blade pieces 11 is
The number of the blade pieces 11 is doubled when the bending overlap portion 22 is shortened by the amount formed, and for example, when the bending overlap portion 22 is shortened to 1/2 and the interval P2 is obtained.

Therefore, FIG. 1 (C) shows a step-by-step process until the bent overlap portion 22 is formed on the connecting portion 19 in the eighth station S8.
From the state of the pre-bending portion 21 in-(1), an external force in the opposite feed direction (reverse direction) indicated by an arrow B in the drawing is received, and the connecting portion 19 is moved as shown in (C)-(2) on the way. It shows that the bent and overlapped portion 22 is bent upward and is finally in close contact as shown in (C)-(3).

In this case, the movement in the direction opposite to the arrow B is at the portion having the connecting portion 19 and the blade piece 11 preceding the eighth station S8, and the original feed of the base material 16 in the arrow A direction is performed. Is stalled. Regarding the specific shape of the connecting portion 19 along the processing process,
It will be apparent from an enlarged perspective view of the main part of FIG. It should be noted that this series of bending processes is executed by a progressive press working device equipped with a mold device to be described later, and at this time, the projecting piece 20 functions as a slip stopper.

Then, at the ninth station S9, the folded and folded portion 22 in the upright state is crushed from above to form the folded portion 23 which is flatly folded so as to be folded as is apparent from FIG. It After that, when the projecting piece 20 is cut off and the blades 11 are sequentially fed by a predetermined pitch, the blade pieces 11 are cut into a predetermined number of predetermined length units, whereby the manufacturing process of the flat fan main portion 12 is completed. To do.

As described above, in the press working by progressive feeding, the above-mentioned first station S1 to ninth station S
9, the blade pieces 11 whose both ends are connected to each other by the connecting portions 19 are continuously cut and raised to form an arc shape, and the pitch interval P1 of each blade piece 11 forms the bent overlap portion 22. Is shortened to a predetermined interval P2 by
Then, each of the constituent units of the predetermined number of blade pieces 11 is cut and separated from the base material 16, and a so-called predetermined length of the fan main portion 12 is substantially formed.
You will get

Thereafter, as shown in FIG. 3, in order to form the flat plate-shaped fan main portion 12 after cutting into a cylindrical shape, the main plate 13 is arranged with respect to the main plate 13 disposed inside thereof. Thirteen
After the blade 11 is inserted into the arcuate cut groove 13a formed on the outer peripheral edge of the, the outer end of the cut groove 13a is caulked to be fixedly connected. Protective rings 14 are attached to the upper and lower ends.

FIG. 4 schematically shows an example of roller caulking as the mounting means, and FIG.
The state before crimping is shown, and the state after crimping is shown in FIG. That is, in FIG. 7A, a circular notch 24 a on the outer peripheral side of the rotary jig 24 is provided so as to fit the annular protective ring 14, and the annular groove 14 a of the protective ring 14 is fitted.
The lower end portion, which is one end of the fan main portion 12, is inserted in the fan main portion 12, so that the connection portion 19 and the collapsible portion 23 are preliminarily arranged in a housed state.

Next, while maintaining this state, the jig 24
And rotate the roller 25 from the outside with arrow C
By applying pressure in the direction, the connecting portion 19 and the folding portion 2 along the shape of the roller 25 as shown in FIG.
It is crimped in a U-shaped cross section so as to wrap around 3, and in this case, by the projecting folds 23 which are present intermittently,
Especially, it is effectively combined as a detent state. Then, also at the upper end of the fan main portion 12 which is the other end, roller crimping is performed under the same preparatory arrangement as described above, whereby a cylindrical multiblade fan as shown in FIG. 3 is manufactured and completed. This multi-blade fan has the main plate 13 mounted in the middle of the fan main portion 12 close to one end thereof, so that when it is rotated, it sucks air from both ends of the fan main portion 12 and blows it outward. Functions as a double suction type.

Therefore, FIGS. 5 to 9 disclose a part of the progressive press working apparatus, and in particular, the seventh to seventh embodiments described above are disclosed.
The mold construction and operation process of the ninth stations S7 to S9 are shown. First, referring to FIG. 5, a schematic structure of the progressive press working apparatus will be described. This is such that a cam driver 27 and a stopper pin 28 are fixed to a lower bolster 26, and a compression coil spring 29 and a stripper bolt 30 are used. The lower cam holder 31 is supported so as to be vertically movable in sliding contact with the vertical surface of the cam driver 27.

The upper cam holder 32 is provided so as to be opposed to the lower cam holder 31 so as to be movable up and down via a compression coil spring 33 and a stripper bolt 34, which constantly bias the expanding cam holder 32 in the expanding direction. The stripper bolt 3
The lower end of the screw 4 is screwed and fixed to the lower cam holder 31, and is vertically movably inserted into the upper cam holder 32.

Then, these upper and lower cam holders 3
A plurality of pairs of mold devices shown in the figure are provided between 2 and 31, and a pre-bending upper mold 35a and a pre-bending lower mold 35b as a pre-bending mold 35 are respectively provided on the upstream side on the left side. The return mold 3 is fixedly arranged on the lower cam holders 32 and 31 and adjacent to the front side which is the downstream side of the preliminary bending mold 35.
6 is provided to form the mold apparatus, and these are arranged side by side through a predetermined gap Q in the normal state shown in FIG. In addition, a rectangular concave portion 47 is formed on the lower surface of the return upper die 36a, and the lower die 3
As the crushing die 48 for crushing the bending overlap portion 22 in cooperation with 6b, the crushing die 48 is integrated with the return die 36 and has a combined use.

The return mold 36 is provided between the upper and lower cam holders 32 and 31 so as to be slidable in the front-rear direction in the left-right direction in the figure, and is connected to the return lower mold 36b and the preliminary bending lower mold 35b adjacent thereto. A compression coil spring 37 is arranged between them. A cam slider 38 is arranged on the right side of the return mold 36. The cam slider 38 is integrally fixed to the return upper die 36a, and is provided slidably to the left (rear) from the predetermined position shown in FIG. 5 with respect to the upper cam holder 32. The lower die 36b is provided in a joined state in which the right side surface of the lower die 36b is vertically slidable.
In addition, guide pins (not shown) are provided between the upper and lower sides of the return upper die 36a and the lower die 36b, and the lower die 36b is naturally movable in the vertical direction with respect to the upper die 36a. The left and right front and rear directions are integrally connected so as not to be displaced from each other.

Therefore, as the cam slider 38 slides, the return die 36 is also moved. Conversely, in the normal state shown in the figure, the return lower die 36b is moved forward by the elastic force of the compression coil spring 37. The upper die 3 is pushed back to the upper die 3 by way of a guide pin and a cam slider 38 (not shown).
6a is also moved to secure the above-mentioned space Q between the adjacent pre-bending die 35. Further, the cam slider 38 has a cam surface 38a, which is also an inclined surface, facing the cam surface 27a, which is an inclined surface on the upper part of the cam driver 27, and also has cam surfaces 38a, 27.
It is arranged so that it comes in contact with and separates from a and is slidable.

Also, the upper and lower cam holders 32, 3
A plurality of spacer blocks 40 that can be retracted by the cylinder mechanism 39 are arranged at a plurality of locations (only one location is shown) between the first and second locations. When the spacer blocks 40 are in a protruding state (see FIGS. A predetermined gap is secured between the cam holders 32 and 31. That is, between the pre-bending upper die 35a and the lower die 35b, and the returning upper die 36a and the lower die 3
6b constitutes gap holding means for securing a predetermined gap G (see FIGS. 7 and 8) between them, and the mounting structure thereof is not shown, but for example, at two positions on the lower cam holder 31 side facing each other. Installed and supported by. still,
The base material 16 is intermittently fed in the direction of arrow A in the mold apparatus having the gap G.

On the upper part of the upper cam holder 32, a holding plate 43 is held by a stripper bolt 44 from an upper bolster 41 via a compression coil spring 42. Further, the leading pin 45 protruding downward is fixed to the upper bolster 41, and the pressing plate 43 at the hanging portion has a through hole 46 through which the pin can be inserted, and the stripper is inserted in the through hole 46. The heads of the bolts 34 are arranged so that they can be inserted opposite to each other.

In the progressive press working apparatus having such a configuration, the operation process will be described step by step with reference to FIGS. Further, FIG. 10 is an enlarged view of a main part for specifically explaining the operation, which will be described by appropriately referring to it, and also showing a processing process of the connecting portion 19 with respect to the base material 16, so that the connecting portion 19 will be described. The longitudinal side is shown. In addition, the outline arrow shown in these drawings has shown the main operation direction of a press working apparatus or a metal mold | die apparatus.

First, FIG. 5 is incorporated in the upper bolster 32 in a so-called mold opening state in which the mold device is in an open state without transmission of a pressing force through a slide mechanism of a press machine (not shown). Each compression coil spring 29, 33,
37 and 42 are in a stretched free length state, the base material 16 is transported to a predetermined position by progressive feeding, and the feeding is in an intermittent stop state. This corresponds to FIG. 10A in which an essential part of the mold device is enlarged in FIG.

Before the mold opening state shown in FIGS. 5 and 10 (a) reaches the clamped operation state shown in FIG. 6, the pre-bending upper die 35a as shown in FIG. 10 (b) is first prepared.
And the return upper die 36a descends. That is, the upper bolster 41 receives a pressing force from a slide mechanism of a press machine (not shown), and sequentially lowers the holding plate 43 and the upper cam holder 32 via the elastic force of the compression coil spring 42.

This downward pressure is applied to the lower bolster 2
6 compresses the lower cam holder 31 against the compression coil spring 29 that supports the lower cam holder 31 from below, and also compresses the compression coil spring 33 between the upper and lower cam holders 32 and 31. Before the pre-bending die 35 and the return die 36 are lowered to the bottom dead center position, the same molds 35a and 36a are closed with the lower molds 35b and 36b in the up-down direction, that is, a so-called mold clamping state is obtained.

FIG. 10B shows this state.
Therefore, the base material 16 is clamped and fixed in the mold device and pressed in the vertical direction, and in the pre-bending mold 35, the slightly bent pre-bending part 21 is formed in the joint part 19. At this time, if another pre-bending portion 21 that has already been processed and exists is present, the pre-bending portion 21 has a space Q between the adjacent pre-bending die 35 and the return die 36.
If there is a bent overlap portion 22 (details of which will be described later) as shown in FIG. 9A, it is crushed as shown in FIG. Mold 48
The crushing process is performed at the same time so that the crushing process is performed so that the crushing part 23 has a flat shape.
Is formed.

However, the pre-bending die 35 and the return die 3
The predetermined gap Q between the pre-bent portion 21 and the pre-bent portion 21 of the present embodiment.
Although it can be said that the length dimension is equivalent to that, to be precise, it is set so as to shorten the connecting portion 19, and has a dimension for forming a bent overlap portion 22 described later.
The front and rear ends of the are clamped and fixed by the mold device through the gap Q.

Now, referring to FIG. 11, the shape of the pre-bent portion 21 will be described.
In order to suppress the plate thickness t of the base material 16 to 2 times or less, “0 <h ≦
It is set in the range of “t × 2 times”. This is because if the height h of the pre-bending portion 21 is increased to increase the so-called bending degree, the pitch dimension in the connecting portion 19 will be different and will affect the next process. Is obtained experimentally. As described above, in the operation mode of the mold apparatus shown in FIG.
The pre-bending process according to No. 5 is performed, and the crushing process with the crushing mold 48 having the recessed portion 47 that also serves as the return mold 36 can be performed.

Thus, when the pre-bent portion 21 shown in FIG. 10 (b) is formed and the front and rear ends of the pre-bent portion 21 are clamped and fixed, the mold apparatus and the like further descends against the compression coil spring 29. The cam surface 38a of the cam slider 38 among them
Engages with the cam surface 27a of the cam driver 27, and thereafter starts moving along the inclined surface shape. That is, while returning to the whole, the return die 36 is pushed by the cam slider 38 and slides to the pre-bending die 35 side on the left side in the drawing, which moves in the direction opposite to the forward feeding direction. Is.

Finally, the state shown in FIG. 6 is reached, and the slide movement is completed. That is, as shown in FIG. 7A, the upper cam holder 32 descends until it hits the stopper pin 28, and thereafter, further descending is blocked, and the relationship between the cam slider 38 and the cam driver 27 is prevented. Then, the sliding movement of the return mold 36 ends.
With such a sliding movement of the return mold 36 in the anti-feed direction, the connecting portion 19 arranged in the gap Q begins to bend along the bending direction of the preliminary bending portion 21 at the preceding stage, and finally the same figure ( As shown in the enlarged view of the arrow X in FIG. 10 (a) shown in FIG. 10 (b), and as shown in FIG. It is pressure molded.

In this case, the bent and overlapped portion 22 is formed so as to be entirely inclined in the feeding direction by the respective inclined surface portions 35c and 36c between the mold devices of this construction arranged in parallel. Also,
The front and rear ends of the bent and overlapped portion 22 are firmly clamped and fixed, and even if the pre-bent portion 21 and the preceding folded portion 23 in these mold devices are present, they are maintained as they are. Therefore, the so-called return bending process by sliding the return mold 36 is shortened by the length of the connecting portion 19 bent and overlapped, as disclosed in the eighth station S8 based on FIG. 1 above. It is.

When the process further proceeds, the state shown in FIG. 7 (a) is reached. That is, the pressing force from the upper bolster 41 is continuously applied to the stripper bolt 3 in the through hole 46 through the leading pin 45 while the compression coil spring 42 is compressed to the maximum.
4 is transmitted. This allows the stripper bolt 34
Is pushed down and lowered, and the lower cam holder 31 coupled thereto is lowered to the bottom dead center position while further compressing the compression coil spring 29. As a result, the pre-bending lower mold 35b and the returning lower mold 36b of the mold device are respectively the upper mold 3
It is separated from 5a and 36a to form a vertical gap.

At this time, the cylinder mechanism 39 shown in FIG. 7A is driven to push the spacer block 40 out in the direction of the arrow, and the spacer block 40 is inserted between the upper and lower cam holders 32 and 31 so that the space between the mold units is increased. The formed gap G is secured. In this case, as shown in the enlarged view of the Y portion in FIG. 7B, the bent overlap portion 22 is maintained in a state of being clamped and fixed between the side surfaces of the upper molds 35a and 36a, and thus the base material 16 is It is held in a state of being bonded to the lower surface side of the same molds 35a and 36a.

Then, the press working apparatus is shown in FIG.
When the pressurization force is released from the state of reaching the bottom dead center position of, the state of FIG. 8 is reached on the way to the open state shown in FIG. 9, and the press working apparatus returns to the state of FIG. 5 described above. First, FIG.
As shown in (a), the upper bolster 41 is urged upward in the mold opening direction via a slide mechanism (not shown), and the elastic force of each compression coil spring 29, 42 is also added to the entire press working apparatus. Starts upward movement in the return direction. Due to this upward movement, the cam surface 38a of the cam slider 38 is
Reaches a position where it engages with the cam surface 27a of the cam driver 27, the cam slider 38 moves rightward along the cam surface 27a of the cam driver 27 through the lower return die 36b by the elastic force of the compression coil spring 37. Press to move.

For this reason, the return upper die 36a also slides rightward while following the upward movement of the whole, and at the same time,
Meanwhile, the gap G is maintained by the spacer block 40. That is, the pre-bending upper die 35a and the returning upper die 36
After the gap G is formed on the lower surface side of a, the return upper die 36a is slid rightward while holding the gap G.

Accordingly, the base material 16 is still stopped with the bent and overlapped portion 22 being formed as shown in FIG. 7B, which is an enlarged view of the Z portion in the figure, but the base material 16 has a gap. G
Since it is free to move downward in the inside, when the return mold 36 slides to the right as described above, it can move smoothly without being substantially restrained. At this time, even if the preceding folded portion 23 is present in the concave portion 47, the connecting portion 19 having the folded portion 23 is flexed and deformed downward (elastically deformed) so that the concave portion 47 can be easily deformed. You can take it off.

Further, according to the present construction, the contact portion between the collapsing portion 23 and the concave portion 47 at the time of this sliding movement is in the bent base portion as shown in FIG. While having a shape D,
In the concave portion 47 serving as the crushing die 48, the corners on the contact side are made into an arcuate shape E to reduce the catch, and the resistance due to these contact portions can be substantially avoided. Movement can be done smoothly without any problems.

Thus, the return mold 36 shown in FIG.
Is continuously slid to the right from the state where it has slid to the right and returned, so that various compression coil springs 29, 33, 42
Returns to the original free length state when assembled, and returns to the open state of FIG. 9 (the same as the state of FIG. 5). At this time, the cylinder mechanism 39 also operates at substantially the same time, and the spacer block 40 returns to its original position. Then, the mold device is also returned to the normal position, and the base material 16 is also placed in a normal installation state where it is placed on the upper surfaces of the lower molds 35b and 36b of the mold device.
Then, after a predetermined one-pitch feed, the press working in the so-called seventh to ninth stations S7 to S9 shown in FIG. 5 to FIG. 9 described above is repeatedly executed while the feed is stopped.

As described above, according to the present embodiment, a large number of blade pieces 11 are cut and raised from the base material 16 of one strip metal plate at a predetermined pitch interval, and then, the blade pieces 11 are connected to each other. The part 19 is moved in the anti-feed direction, and the return bending step of forming the upright bent and overlapped part 22 on the connecting part 19 is performed by the progressive process.

As a result, the bent overlap portion 22 can be formed in the connecting portion 19 for connecting the blade pieces 11, and the intervals between the blade pieces 11 can be adjusted to be sufficiently shortened. The blade piece 11 can be arranged to obtain desired desired air blowing performance. In addition, this back bending process,
This is made possible by utilizing the intermittent stoppage during progressive feeding, so that not only can sequential and efficient manufacturing be performed efficiently, but the bent overlap portion 22 of the required shape and size can be secured. In addition, it is possible to provide a multi-blade fan which is excellent in workability, advantageous in cost reduction, and capable of ensuring desired performance with uniform quality.

Incidentally, the bent overlap portion 22 in this embodiment.
Since it has a shape in which the whole is inclined in the feeding direction, it can be surely bent and the return deformation can be suppressed. In addition, it is effective in easily and surely performing the crushing process in the next step, and the bent and overlapped portion 22 in the upright state becomes larger as the length of the connecting portion 19 is shortened, but it becomes high by inclining the whole. It is also advantageous in that the size can be suppressed, and accordingly, the mold apparatus can be prevented from becoming large and can be made compact. In this case, the bent and overlapped portion 22 is not limited to be inclined as a whole, and at least a part thereof may be inclined. For example, even if the upper half portion is inclined, substantially the same effect can be expected.

The return bending step is performed by the bending and overlapping portion 2
After the front and rear ends excluding the connecting portion 19 forming 2 are clamped and fixed by a mold device, the return mold 36, which fixes the front end, is moved in the anti-feed direction. Only the connecting portion 19 in the restrained state is surely bent, so that an effective bent overlap portion 22 can be obtained. In addition, even in such a combination as described above in which the return die 36 is slid in the counter-feed direction, it is easily adopted in the progressive press working apparatus, as described in detail with reference to FIGS. 5 to 9. It can be done and the intended purpose can be fully achieved.

In particular, the returning operation of the return die 36 among them is performed by the return lower die 36b through the gap holding means including the spacer block 40 as described with reference to FIGS.
Since the return upper die 36a is moved back after making the gap G to form and secure the gap G, the connecting portion 19 which is clamped and fixed is released to the lower side, and it is impossible for the base material 16 at all. It is possible to perform a smooth return movement without any external force, and substantially without any resistance in the return operation of the return mold 36.

In this case, when the return lower die 36b is not moved down in advance and the return operation of the die 36a is performed, that is, when the slide movement is performed, the connecting portion 19 is held in the return die 36 and pulled in the return direction. As a result, an external force that stretches the bent lap portion 22 that has once been bent acts, so that an effective bent lap portion 22 cannot be secured, and the mold device is always provided with a compression coil spring. 29, 42
Since elastic forces such as the above act in the upper and lower mold clamping directions, the return movement of the return mold 36 is difficult and not easy.

Further, according to this embodiment, the gap G formed by the spacer block 40 is temporarily maintained.
If the spacer block 40 is not provided,
Referring to FIG. 7, even if the gap G is formed by descending to the bottom dead center position, when the entire mold device and the like start to rise due to the return operation, the return bottom supported by the cam holder 31 side is lowered. The die 36b is urged in the direction of joining to the upper die 36a side by the elastic force of the compression coil spring 29 in the maximum compressed state, and the connecting portion 19 is pinched and fixed again.

As a result, again, as described above, there arises a problem that the bending lap portion 22 is stretched in accordance with the returning operation and the returning operation of the return die 36 cannot be performed smoothly. In this embodiment, the gap G is held by the gap holding means for a required time and the returning operation of the return die 36 is started. In the pressing process, it can be dealt with in a timely, reliable, and efficient manner.

On the other hand, since the pre-bending step for pre-orienting the connecting portion 19 in advance is provided before the return bending step, a smooth bending process can be performed in the same direction in the return bending step. Uniform bent portion 22
Can be obtained. In addition, in this preliminary bending step,
Not only is it possible to direct the bending and folding in the next step by forming a few bent portions, but in particular, as described with reference to FIG. 11, the height h of the preliminary bent portion 21 is set to "0 <h≤. By setting in the range of “plate thickness × 2 times”, an excessive tension on the base material 16 and an unreasonable external force to the mold device are applied to the base material 16 in the subsequent process in combination with a slight extension of the metal material. Therefore, it can be suppressed within a permissible range that does not affect the processing and shape of the multi-blade fan, and progressive press working can be properly performed at an appropriate position.

Then, in the step of crushing the bent overlap portion 22,
Since the bent and overlapped portion 22 has the inclined shape as described above, the bent and overlapped portion 22 in the upright state can be easily folded in the inclining direction with a die device that simply moves up and down (folding portion 23). Moreover, since a large pressing force is not required, it can be performed at the same time as other processing, and as the crushing die 48 as in the present embodiment, it can be integrally used in common with the return die 36 and can also be used. It can be applied to a progressive press machine without difficulty.

Further, the crushed portion 23 by this crushing process
Since it is formed into a compact shape by being caulked into a flat shape, it constitutes the cylindrical fan main portion 12, and therefore, when the protective ring 14 is attached to the end of the fan main portion 12, the folded portion 23 is protected by the protective ring 14. It can be easily put into the inside of the fan and has excellent workability, and the external shape of the multi-blade fan can be neat and well-structured.

The present invention is not limited to the above-described embodiment shown in the drawings, but can be carried out by variously modifying it in practice. For example, FIGS. 12 and 13 show a crushing die 49. A modified example is shown, and the return mold 36 which is also used is common to the above-mentioned embodiment.
First, FIG. 12 is an enlarged view of the configuration of the crushing die 49 and the shape of the fold portion 50 formed by the crushing die 49.
The crushing upper die 49a is formed with a concave portion 51 which is recessed in an arc shape on the lower surface, while the crushing lower die 49b is formed with an arcuate projection 52 which faces the concave portion 51. . These arc shapes have substantially the same diameter dimension along the outer diameter shape of the fan main portion 53 formed in a cylindrical shape shown in FIG.

Therefore, the crushed portion 50 formed by the crushing die 49 is formed in the same arc shape.
As can be seen from FIG. 13, this is the shape along the cylindrical shape of the fan main portion 53.
Since the free end F side of does not project away from each other as shown by the chain double-dashed line in the figure, when constructing the cylindrical fan main part 53, it is necessary to attach a protective ring (not shown) attached to the end. A simple multi-blade fan can be provided while making it easier.

In addition, the present invention is not limited to the manufacture of the multi-blade fan shown in the above embodiment, but after forming a plurality of constituent pieces such as the blade pieces 11, the return mold 36 is moved in the direction opposite to the feed direction of the base material 16. The present invention can be applied to those that move and process, and specifically, means for forming a gap G to smoothly perform the returning operation of the return mold 36, or a gap holding means for temporarily holding the gap G, Also, those driving means and the like can be variously embodied and widely implemented without departing from the scope of the present invention.

[0077]

As described above, according to the present invention, a plurality of component pieces are cut and raised at a predetermined pitch interval by a press working in which a base material of a single strip-shaped metal plate is sequentially fed. The connecting portion to be connected is moved in the anti-feeding direction, and the returning bending step is performed to form a bent overlapping portion in an upright state at the connecting portion.

As a result, a bent overlap portion can be formed in the connecting portion connecting the constituent pieces to each other, and the intervals between the constituent pieces can be adjusted to be sufficiently shortened, and a large number of constituent pieces can be formed per predetermined length. Can be provided, and in the case of a multi-blade fan, desired excellent air-blowing performance can be obtained. In addition, this return bending process can be performed by utilizing the intermittent stoppage during progressive feeding, so that not only can it be efficiently performed by progressive feeding, but the bending and lapping of the required shape and size can also be performed. It is possible to provide a manufacturing method of a multi-blade fan or the like that can reliably obtain a part, is excellent in workability, is advantageous in cost reduction, and can ensure desired performance with uniform quality.

[Brief description of drawings]

FIG. 1 is a process diagram showing an embodiment in which the present invention is applied to manufacture of a multi-blade fan, until a fan main portion is formed by progressive press working.

FIG. 2 is an enlarged perspective view showing an essential part of a forming process.

FIG. 3 is a perspective view of a multi-blade fan.

FIG. 4 is a process diagram of a main part in which a protection ring is attached to an end portion of a fan main part, (a) showing a state before caulking and (b) showing a state after caulking;

FIG. 5 is a sectional view showing a mold opening state in a part of the progressive press working apparatus.

FIG. 6A is a view corresponding to FIG. 5 showing a mold clamping state,
(B) is an enlarged view of the X section in the same figure

FIG. 7A is a view corresponding to FIG. 5 showing a returning operation process,
(B) is an enlarged view of the portion Y in the figure

8 (a) is a view corresponding to FIG. 5 showing a further returning operation process, and FIG. 8 (b) is an enlarged view of a portion Z in FIG.

FIG. 9 is a diagram corresponding to FIG. 5 showing a return state.

FIG. 10 is an enlarged view of a main part (a, b, c) for explaining a forming process.

FIG. 11 is an enlarged view of a preliminary bending portion.

FIG. 12 is an enlarged view showing a partial forming process in a modified example.

FIG. 13 is a plan view of a main part of a fan main part.

14 is a view corresponding to FIG. 3 showing a conventional example.

FIG. 15 is a perspective view corresponding to FIG.

[Explanation of symbols]

11 is a blade piece (component piece), 12 and 53 are fan main parts, 1
Reference numeral 4 is a protective ring, 16 is a base material, 19 is a connecting portion, 21 is a pre-bending portion, 22 is a bending overlapping portion, 23 is a folding portion, 35 pre-bending dies (die equipment), 36 return dies (dies). Mold device), 4
0 spacer block (gap holding means), 47 and 51 are recessed portions, 48 and 49 are crushing dies (die device), and 52
Is a protrusion.

Continued front page    (72) Inventor Osamu Yamada             31 at 1509 Komaba Shogenji, Nakatsugawa City, Gifu Prefecture             Shinwa Industry Co., Ltd. F term (reference) 3H033 AA02 BB02 BB06 BB19 CC01                       DD25 EE19

Claims (9)

[Claims] 1. A step of cutting and raising a plurality of component pieces by press working in which a base material of one strip-shaped metal plate is intermittently fed at a predetermined pitch, and a connecting portion interconnecting the component pieces. In the manufacturing method of performing a back-bending step of forming a bend-overlap portion at a connecting portion between each of the constituent pieces after the step of forming the step, the back-bending step comprises intermittent feeding stop of the base material. At the same time, the connecting portion is moved in the anti-feeding direction, and a bent overlapped portion in an upright state is formed on the connecting portion, which is a method for manufacturing a multi-blade fan or the like. 2. In the return bending step, the front and rear ends excluding the connecting portion forming the bent overlap portion are clamped and fixed by a mold, and the return mold having the front end fixed therein is moved in the anti-feed direction. The method for manufacturing a multi-blade fan or the like according to claim 1, wherein. 3. The method for manufacturing a multi-blade fan or the like according to claim 1, wherein at least a part of the bent overlap portion has an inclined shape. 4. The method for manufacturing a multi-blade fan or the like according to claim 2, further comprising a pre-bending step in which a connecting portion is bent and a direction of bending and stacking is provided in a preceding stage of the returning bending step. 5. The height h of the bent portion in the preliminary bending step is 0.
The method for manufacturing a multi-blade fan or the like according to claim 4, wherein the range is set such that <h ≦ plate thickness × 2 times. 6. The returning operation of the returning mold after the returning bending step is performed by lowering the lower returning mold to form a gap and then moving the upper returning mold back. 2. A method for manufacturing a multi-blade fan or the like according to 2. 7. A gap holding means is provided, which operates during the returning operation of the return mold and when a gap is formed between the upper mold and the lower mold of the mold and temporarily holds the gap. The method for manufacturing a multi-blade fan or the like according to claim 6. 8. The multi-blade fan according to claim 7, further comprising a crushing step after the return bending step, wherein the crushing step is performed by pressing the bent overlapped portion in the upright state by the upper and lower molds to fold it. Etc. manufacturing method. 9. The method for manufacturing a multi-blade fan or the like according to claim 8, wherein the crushed portion in the crushing step has an arc shape along a cylindrical outer diameter shape of the multi-blade fan or the like.