JP2004322164A - Manufacturing method of parking pole for at of vehicle by press complex forming - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable press forming of highly precise formed parts with ease. <P>SOLUTION: The female die has a tapered face whose diameter becomes smaller toward the depth from a surface facing to a punch and a forming part arranged at the end of the tapered part. A plate-shaped workpiece produced by hot, warm and cold forging processes or a casting process is press formed to the parking pole for automatic transmission of vehicle by the use of the female die. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention manufactures a plate-shaped material having a complex shape at low cost by hot, warm, and cold forging or casting, and then uses a precision punching technique to perform a composite press working of a parking pole for an automobile AT. And a method for producing the same.
[0002]
[Prior art]
In the conventional manufacturing method, hot, warm, and cold forgings and cast castings are manufactured, and then finished by full cutting.
In a part of a product that requires special precision, a machining method completed by polishing or buffing requires a large number of man-hours.
In addition, since a cutting step using a cutting tool such as an end mill is added to the finishing of each hole in the plate-shaped material, a processing cost about three times the price of the plate-shaped material is required.
[0003]
As another manufacturing method, a fine blanking press machine (hereinafter, referred to as an FB press machine) may be used to precisely punch a sheet material into a required contour shape.
Processing by the FB press machine is to use a special FB press machine to drive a special wedge called a material holder into the sheet material, and to apply a strong pressure to the counter to apply a special stress to the material at the time of punching. Punching with extremely small clearance between female and female dies.
This is a processing method that finishes the processing surface to a level equivalent to relatively beautiful cutting by these operations (for example, see Patent Document 1).
[0004]
The biggest disadvantage of the processing by the FB press machine is that the cut-out portion is generated in an amount of about 20 to 30% of the thickness in proportion to the thickness of the plate-shaped material. For this reason, in a product that does not like the occurrence of sagging, the sagging portion is removed by cutting.
[0005]
[Patent Document 1]
Patent No. 2829270 [0006]
[Problems to be solved by the invention]
Hot, warm, cold, forged or cast plate-shaped material is manufactured, and then the contours and various holes are made by pressing, but if precision is required, conventional full cutting Since finishing is performed by processing, there is a problem that the number of processing steps is large and the manufacturing cost is increased.
Further, there is a problem that productivity is low even in processing using an FB press machine, and as described above, it is not possible to completely prevent the occurrence of a cutout portion.
The present invention has been proposed in view of the above problems, and an object of the present invention is to enable high-precision molded products to be easily press-molded.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, there is provided a method for manufacturing a parking pole for an automobile AT by press-combining an outer peripheral contour portion of a plate-shaped material and / or a hole in the plate-shaped material using a press machine. When performing press working using a die composed of a female die, a counter and a punch, the female die forms a tapered portion having a tapered surface having a smaller diameter toward the back than the surface facing the punch, and the tip of the tapered portion is formed. Parts are formed, and the female die is used for automobile AT by pressing a plate-like material formed by hot, warm, cold, forging press working or casting by reciprocatingly passing through a forming part. A parking pole is formed.
[0008]
In addition, the female die has a taper portion set from 3 ° to 45 ° on one side taper angle from the entrance toward the back from the surface facing the punch, or a single molded portion at the back of the taper portion, It is also characterized by the fact that the portion between the molding portions is formed in a straight shape.
[0009]
Further, the plate-shaped material has a protrusion for preventing sagging in at least a part of a peripheral portion, and the plate-shaped material has an outer shape that is 0.01 mm to 2.5 mm larger than a required finished dimension. On the other hand, the inner dimension can be made smaller by 0.01 mm to 2.5 mm on one side, and the dimension of the contoured part of the female die can be reduced by 0 to 5% of the thickness of the plate material from the finished dimension. It is also characterized in that it is manufactured or processed while holding a plate-shaped material in a female die.
[0010]
Embodiment
An embodiment of a method for manufacturing a parking pole for an automobile AT by press compounding according to the present invention will be described with reference to the drawings.
FIG. 1 is a vertical sectional front view of a punching die for processing a parking pole. In the drawing, reference numeral 1 denotes a female die, 2 denotes a large-diameter punch, 3 denotes a plate-shaped material (work), and the female die 1 faces upward. The large-diameter punch 2 is installed on the lower side.
At the center of the positioning plate 4 of the plate-shaped material 3, a concave portion 5 is formed to guide the positioning, and a plurality of ejector pins 23 arranged on the positioning plate 4 or the upper surface of the large-diameter punch 2 are used to form the plate-shaped material 3. 3 is arranged at a position about 5 mm higher than the upper surface of the large-diameter punch 2.
Further, these ejector pins 23 are intended to prevent the burrs or the like generated on the outer peripheral portion of the plate-shaped material 3 from sticking, and to stably remove the plate-shaped material from the upper surface of the punch.
In the concave portion 5 of the positioning plate 4 of the plate-shaped material 3, grooves (not shown) for air blow are formed in several places around the concave portion 5.
[0011]
At the center of the female die 1, a pressure-adjustable counter 6 is installed so as to be vertically slidable, and is constantly receiving a constant downward pressure. The lower surface 6 a of the counter 6 is at the lower surface of the female die 1 (facing the punch). The lower surface portion 6a protrudes more than 2 mm from the surface 1a, and the lower surface portion 6a hits the plate-shaped material 3 prior to the female die 1 to sandwich the plate-shaped material 3 on the large-diameter punch 2.
The lower portion (the surface facing the punch) 6a of the counter 6 blows off traces generated during molding of the plate-shaped material 3 by an air blow means (not shown), and the upper surface of the plate-shaped material 3 is not damaged by the traces. It has become.
A small-diameter punch 7 for punching is provided inside the counter 6 so as to be vertically movable, and the lower surface 7a of the punch 7 is set at a position several millimeters higher than the lower surface 1a of the female die 1.
A flange 19 is formed at the upper part of the small-diameter punch 7. The flange 19 is housed in the punch holder 20 while being pressed downward by a spring 22 or urethane via a push-down pin 24 from above. Have been.
The coefficient of restitution of the spring 22 or urethane is determined according to the material and thickness of the plate-shaped material 3, the required vertical momentum of the small-diameter punch 7, and the like, and the strength of the spring 22 or urethane is adjusted by the two screw screws 21. You.
[0012]
As shown in FIG. 3, a forming part 9 having forming parts 8, 8 at the top and bottom is hollowed out at a portion near the lower surface 1a of the female die 1.
The forming portions 8 of the forming portion 9 are formed to have a contour of a desired processing shape, and a straight cylindrical portion 10 is formed between the forming portions 8.
A downwardly expanding tapered entrance / exit 11 is formed from the lower forming portion 8 to the lower surface 1a of the female die 1, and the one-sided taper angle α is set to 20 °. Here, the one-sided taper angle α is set between 3 ° and 45 °.
That is, when the one-sided taper angle α is less than 3 ° and exceeds 45 °, cracks easily occur in the plate-shaped material 3.
[0013]
The upper part from the upper molded part 8 is a tapered relief part 12 expanding upward as shown in FIG.
The relief portion 12 is formed in a tapered shape, but may be straight as shown in imaginary diagrams 13 and 14.
The plate-shaped material 3 processed by the above-mentioned mold is formed by casting or forging as shown in FIG.
That is, the outer shape of the plate-shaped material 3 is larger than the required finished dimension by 0.01 mm to 2.5 mm, while the inner size of the hole 15 is 0.01 mm to 2.5 mm on one side of the finished dimension. A material convex portion 16 is formed at the edge portion of the front end portion which is manufactured to be small in millimeters and in which the excess thickness is easily moved.
Here, if the external dimensions are less than 0.01 mm, chipping is likely to occur at the corners, and if it exceeds 2.5 mm, the excess thickness becomes too large and processing becomes difficult.
This is the same for the inner shape.
The plate-shaped material 3 can be formed by punching or cutting instead of casting or forging.
[0014]
Next, a procedure for processing the plate-shaped material 3 with the mold having the above-described configuration will be described.
First, the plate-shaped material 3 is accurately placed in the concave portion 5 of the positioning plate 4 on the large-diameter punch 2 with the material convex portion 16 facing upward.
When the press starts descending, the lower surface 6a of the counter 6 first comes into contact with the plate-shaped material 3, and the plate-shaped material 3 is pressed with a constant pressure.
Since the plate-shaped material 3 on the large-diameter punch 2 is pressed by the upper pressure body 16 via the counter knockout pin 17, the plate-shaped material 3 is held on the large-diameter punch 2 so as not to move back and forth and right and left.
When the female die 1 is lowered, the operation of punching out the outer peripheral portion of the plate-shaped material 3 at the forming part from the tapered entrance of the female die is started.
[0015]
When the plate-shaped material 3 on the large-diameter punch 2 is passed down to the straight cylindrical portion 10 and the relief portion 12 at a stroke by the lowering of the female die 1, the small-diameter punch 7 is raised several millimeters above the lower surface 6a of the counter 6. I'm waiting.
The small-diameter punch 7 hits the hole 15 of the plate-shaped material 3 and a small-diameter punching process is started.
At the time of processing, the plate-shaped material 3 advances until the female die 1 reaches the lowest point in a state where the left, right, front and rear movements are held immobile. At this time, the pressure of the upper hydraulic pressure body 16 is switched to a stronger pressure.
The plate-shaped material 3 passes through the forming part 8 and the straight cylindrical part 10 from the entrance 11 and then moves to the relief part 12.
The punched outer peripheral portion of the plate-shaped material 3 is released to a relief portion 12 in the die 1 and expands in a tapered shape slightly wider than the dimension of the straight cylindrical portion 10 (see FIG. 4).
When the plate-shaped material 3 is passed through the straight cylindrical portion 10 from the relief portion 12 from the top to the bottom in FIG. 4, an additional process for correcting the tapered expansion portion is performed.
[0016]
The dimensions of the plate-shaped material 3 discharged from the female die 1 are expanded, for example, into a tapered shape having a diameter of 0.04 mm to 0,06 mm due to processing at the time of pressing down. By removing this expanded portion, the expanded portion of the plate-shaped material becomes 0.02 to 0.025 mm in diameter when it is discharged from the female die 1.
Here, since the manufacturing dimension of the straight portion 10 which determines the accuracy of the female die 1 is manufactured by taking into account the expansion coefficient, it is manufactured by 0.02 mm in diameter smaller than the required dimension. It is possible to manufacture the material with an extremely small material outer diameter error of 0.005 mm or less in diameter.
By adjusting the pressure applied to the plate-shaped material 3 by the pressure body, it is possible to prevent the punch from being damaged when a hole is formed by 30% of the thickness of the plate-shaped material 3. This makes it possible to make a hole of 3 mm for the thickness of the plate material 3 of 10 mm.
[0017]
As described above, the vertical movement of the small-diameter punch 7 during the processing is performed after the tip 7a of the small-diameter punch 7 reaches the straight cylindrical portion 10 of the female die 1 with a delay after the processing of the outer peripheral portion of the plate-shaped material 3. Start processing.
Thus, the pressurized tonnage for drilling can be reduced by providing a time lag between the outer periphery punching and the small diameter hole 15 punching, and the pressurizing tonnage can be reduced. Can be accurately processed.
Here, when the small diameter punch 7 is out of the hole 15 of the plate-shaped material 3, the hole 15 is deformed because it receives pressure from the outer peripheral portion when passing through the forming portion 8 of the female die 1 and the straight cylindrical portion 10. And shrink.
In order to prevent this deformation and reduction, the female die 1 is raised with the small-diameter punch 7 pierced into the hole 15 of the plate-shaped material 3, and the plate-shaped material 3 comes out of the straight cylindrical portion 10 into the tapered portion 11 therebelow. Since the small-diameter punch 7 is removed from the hole 15 of the plate-shaped material 3 at that time, there is no pressure toward the small-diameter hole 15 from the outer peripheral portion of the plate-shaped material 3 at that time. Therefore, it is possible to keep the hole diameter precisely.
[0018]
When the counter 6 starts to ascend after passing through the lowest point of the press as described above, the small-diameter punch 7 is maintained in the state of being inserted into the hole 15 of the plate-shaped material 3 for a while, and the tapered portion 11 of the female die 1 The small-diameter punch 7 also comes off from the small-diameter hole 15 at the time of leaving the raw material 3.
With this operation, when the plate-shaped material 3 passes through the straight cylindrical portion 10 of the female die 1 in reverse, the hole 15 of the plate-shaped material 3 can be precisely finished without being deformed or shrunk.
[0019]
In addition, when the female die 1 passes through the lowermost point, the positioning plate 4 of the plate-shaped material 3 is pushed down at the outer peripheral portion of the large-diameter punch 2, and at the same time, ring-shaped scum is generated on the outer peripheral portion of the plate-shaped material 3. I do.
The scrap is pushed down from the upper surface of the large-diameter punch 2 downward.
The scraps are discharged to the outside of the mold by raising the positioning plate 4 of the plate-shaped material 3 with the timing of the lower pressure pin 18 in synchronization with the timing.
At this time, the traces generated during molding of the plate-shaped material 3 are blown off from the upper surface of the large-diameter punch 2 by an air blow means (not shown), and the lower surface of the plate-shaped material 3 is not damaged by the traces.
[0020]
The plate-shaped material 3 does not bite into the outer peripheral portion of the upper surface of the large-diameter punch 2 by the ejector pins 23 and does not need to be separately cleaned by an air blow means (not shown). Can be automatically loaded and unloaded at a high speed.
In the above-described embodiment, two molding parts 8 are provided on the upper and lower sides, but it is needless to say that the number of molding parts 8 can be reduced to one.
[0021]
【The invention's effect】
As described above, since it is possible to produce with high productivity using an inexpensive general-purpose press machine as compared with conventional cutting and FB press methods, it can be provided to a wide range of markets by producing inexpensive parking poles. .
The cast material can be manufactured by hot, warm, and cold forging or casting, and a precision product can be instantaneously manufactured by one-stroke processing using a general-purpose press.
Hot, warm, cold forged plate-shaped material or cast plate-shaped material is provided with a tapered convex part in a part of the plane partially so as to prevent a sagging part at the time of punching. Therefore, after this precision punching process, there is almost no punch sagging part, and the precision of the precise outer contour and each hole, the cut surface can be mirror-finished, and a product with high productivity and low cost can be manufactured.
By the way, there are two formed portions at the back of the tapered portion, and a shock line is not attached to the outer peripheral portion when the formed portions are formed in a straight shape.
[Brief description of the drawings]
FIG. 1 is a vertical sectional front view of a precision press punching die of a parking pole of the present invention.
FIG. 2 is a perspective view of a plate-shaped material of a parking pole according to the present invention.
FIG. 3 is a vertical sectional front view showing the internal configuration of a female die of the parking pole of the present invention.
FIG. 4 is an explanatory view of a parking pole according to the present invention being processed by a female die.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Female die 6 ... Counter 7 ... Small diameter punch 8 ... Molding part 11 ... Tapered part 15 ... Hole

Claims (8)

In a method of manufacturing a parking pole for an automobile AT by press compounding using a press machine, an outer contour shape portion of a plate-shaped material and / or a hole portion in the plate-shaped material are formed by molding a female die, a counter and a punch. In using and press working, the female die forms a tapered portion having a tapered surface having a smaller diameter toward the back than the surface facing the punch, and the tip of the tapered portion is formed with a molded portion, and in the female die, A parking pole for an automobile AT is formed by pressing a plate-shaped material formed by hot, warm, cold, forging press working or casting by reciprocating through a forming portion. Manufacturing method of a parking pole for an automobile AT by press compounding. The automobile AT parking according to claim 1, wherein the female die has a taper portion having a one-side taper angle between 3 ° and 45 ° from an entrance toward a back of a surface facing the punch. A method of manufacturing poles by press compounding. 3. The parking pole for an automobile AT according to claim 1, wherein a single molded portion is formed at the back of the tapered portion, and the plate-shaped material is reciprocated and molded at the molded portion. Manufacturing method by press compounding. 2. The automobile AT according to claim 1, wherein two formed portions at the back of the tapered portion are formed, the formed portions are formed in a straight shape, and the plate-shaped material is formed by the formed portions. Manufacturing method of parking pole by press compound processing. 2. The manufacturing method according to claim 1, wherein the plate-shaped material is provided with a protrusion for preventing sagging on at least a part of a peripheral portion thereof. The plate-shaped material is formed with an outer shape 0.01 mm to 2.5 mm larger than the required finished size, while the inner shape size is manufactured 0.01 mm to 2.5 mm smaller on one side than the finished size. A manufacturing method of the parking pole for an automobile AT according to claim 1 by press compounding. 2. The manufacturing method according to claim 1, wherein the contour of the female die is formed such that the thickness of the plate-shaped material is 0-5% less than the finished dimension. 2. The method according to claim 1, wherein the plate-shaped material in the female die is machined with both surfaces thereof sandwiched.

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