CN1110382C - Thin sheet forming dies - Google Patents

Abstract

The present invention relates to a shaping mould with a shaping position. When a second mould is connected with a first mould for shaping a thin plate, a negative angle is formed. During the shaping process of the thin plate, a cylindrical rotary mould block with a groove arranged in the axial direction can be arranged in the first mould in a rotary mode, a negative angle shaping position is formed at the edge of the groove of the rotary mould, and a sliding mould with a negative angle shaping position is arranged on the second mould in a mode corresponding to the rotary mould. An automatic resetting device arranged on the first mould is used for rotating and contracting the rotary mould to ensure that a workpiece can be dismounted from the first mould after being shaped.

Description

Sheet Forming Die

technical field

The present invention relates to thin plate forming dies.

Background technique

Negative angles of thin sheets such as metal or plastic sheets often result from the use of sliding modules.

At present, the negative angle forming mentioned here refers to: when the workpiece installed on the lower die is vertically lowered to be processed by the upper die to be joined, the forming process is completed by the forming part, which starts at the working point of the upper die Move inwards towards the lower die.

In the traditional negative angle forming process of thin plate products, the workpiece is loaded on the lower die, and the upper die is lowered in the vertical direction, so that the active module on the upper die drives the driven module on the lower die, and the workpiece is processed from the side, when When the processing is completed and the upper die is lifted, the driven module is spring back.

In this process, the forming part on the driven module slides and forms the workpiece from the outside of the workpiece. Its overall profile must be exactly the same as the forming part of the workpiece, but the forming part of the lower die that loads the workpiece must be designed to be able to separate and shrink The part that forms the negative angle of the lower die, or deletes the rear part of the part that forms the negative angle, and the workpiece is moved forward so that the workpiece can be unloaded. When the negative angle is small, there is no serious problem, but when the negative angle is large or the workpiece has a slim frame-like cross-section with grooves, such as the front pillar surface in automotive sheet metal parts, Due to the narrow groove width of the workpiece, when the part of the lower die as a negative angle is separated or deleted, not only cannot a clear outline be formed on the forming part of the passive module, but also the strength of the lower die is not sufficient for negative angle take shape.

In the process of forming a negative angle using a sliding module, the passive module slides over a relatively long linear distance to complete the forming, and repeated sliding of the passive module cannot always be easily and accurately positioned at a specific position, so that product quality is difficult to stabilize. In addition, it is often the case that products are distorted or warped and must be refurbished, but the refurbishment of some products is not practically possible, such as parts that make up automotive panels, such as: body side panels, front fenders , roof, bonnet, decklid, door panels, or front pillar surfaces because these parts have three-dimensional surfaces and contours. In automotive sheet metal parts, if there is any distortion or warp in the product, it will be difficult to assemble these parts with other parts, and it will not be possible to provide high-quality automotive sheet metal structures, nor can the specific product accuracy of thin sheet formed products be guaranteed.

When using a sliding module, a large module and a module seat must be installed on one side of the lower die, on which the workpiece of the lower die is mounted, which requires a large area of the lower die, increases the weight of the die, and makes the die expensive.

Therefore, in order to solve the above problems, the applicant has proposed a thin plate forming method and forming die in Japanese Patent Laid-Open No. 63-41662, which converts the up and down linear motion of stamping into rotary motion.

Now, the forming die will be described in detail with reference to FIGS. 4-8.

Fig. 4 is a left and right perspective schematic diagram of a complete front pillar outer surface, which is an automobile sheet metal part produced by a forming die. In the figures, the lower image shows the right side of the front pillar face and the upper image shows the left side. The surface of the front pillar constitutes a part of the front door frame, a part of the front windshield frame, and a part of the roof support frame, and forms a joint with many other parts. Therefore, this part has strict product accuracy requirements. If the required accuracy If it is not achieved, high-quality sheet metal body cannot be provided.

Since the front pillar surface forms part of the vehicle panel, it has three-dimensional curved surfaces and contours.

The negative-angle portion formed by the forming die is indicated by F in the figure, and its cross section is indicated by a workpiece W in FIG. 8 .

That is to say, after the negative angle is formed, the workpiece W reaches the state in FIG. 8 from the state in FIG. 5 . Incidentally, this molding process includes: first, rolling, then peripheral shaping to the state shown in Fig. 5, followed by a third step of molding.

Regarding the lower die 100 , a cylindrical rotary module 102 with an axial slot 101 is rotatably mounted on the lower die body 103 . The lower mold body 103 is firmly fixed on the lower base 121 with bolts 122 . The shape of the upper surface of the lower mold body 103 is made to accommodate the workpiece W, and the negative angle forming part 104 is processed on the edge of the slot 101 of the rotary module 102 , very close to the upper surface of the lower mold 103 . The automatic reset device embedded in the lower mold body 103 makes the rotary module 102 rotate and shrink, so that the workpiece W can be removed from the lower mold body 103 after forming. In this example, under the elastic force of the coil spring 106, the automatic reset device 105 makes the push rod 107 contact the end bottom surface of the rolling plate 108, and the rolling plate is firmly fixed on the slot 101 of the rotary module 102 with a bolt 151. On the face opposite to the negative angle forming part 104. For automatic reset device 105, can use as pneumatic device, hydraulic device, link mechanism, module or other similar mechanism etc., this device can not only be installed on the lower mold 100, also can be installed between upper mold 109 and lower mold 100.

On the other hand, on the upper mold 109, the sliding module 110 is installed on the position opposite to the above-mentioned rotary module 102, and a negative angle forming part 112 is arranged at the bottom end of the sliding module 110, and the sliding module 110 is guided by the guide (Fig. Not noted in the middle), the compressed coil spring 117 is pressed against the outside of the mold, the spring is compressed and installed between the top surface of the sliding module 110 and the bottom surface of the inclined guide 154, and the guide is firmly fixed with bolts 153 on the upper base 152 . The sliding module 110 is blocked by a baffle 156 firmly fixed on the inclined guide 154 with bolts 155 . The buffer pad 157 is supported downwards by the coil spring 158, and is suspended on the upper base 152 by the suspension bolt 119, and the workpiece W is strongly pressed onto the lower die body 103 to prevent the workpiece W from moving before its negative angle is formed.

The operation of the forming die will be described below.

First, as shown in Figure 5, the upper die 109 is located at the top dead center of the stroke, then the workpiece W is placed on the lower die body 103 of the lower die 100, during this process, the rotary module 102 is under the action of the automatic reset device 105 Turn and shrink.

Then, upper die 109 starts to descend, and as shown in Figure 6, first the bottom surface of sliding module 110 contacts with rolling plate 108, makes rotating module 102 rotate clockwise in Figure 6, but does not cause sliding module 110 and rotating The negative-angle forming locations 104 on the modules 102 interfere with each other.

As the upper mold 109 continues to descend further, the sliding module 110 pushed towards the outside of the mold is against the elastic force of the coil spring 117, and moves laterally to the left under the action of the module, reaching the state shown in Figure 7, the rotated The negative angle forming part 104 on the rotary module 102 cooperates with the negative angle forming part 112 on the sliding module 110 to form a negative angle on the workpiece W.

After the negative angle is formed, the upper mold 109 begins to lift, and the sliding module 110 is supported by the coil spring 117 toward the outside of the mold, moves to the right and rises in FIG. 8 , and does not interfere with the workpiece W that has formed a negative angle.

On the other hand, because the constrained sliding module 110 rises, the rotating module 102 rotates to the right in FIG. , the removal of the workpiece W does not interfere with the negative angle forming part 104 of the rotary module 102 .

The formed thin plate is formed with the negative angle by using the above-mentioned rotary module, but since the rotary module rotates around the axis of rotation to process the workpiece, if the workpiece is close to a straight line without a large bend, the part to be formed with a negative angle can enter the same However, if the workpiece has a large curvature, the part to be formed with a negative angle cannot completely enter one of the rotary modules with the same diameter and cannot be machined.

In particular, automobile sheet metal parts, including door panels, have many curved parts, and in recent years, from the design point of view, many negative angle forming parts have been added in addition to the traditional bending parts, and these negative angle forming parts are required to be completed in one process Parts are formed instead of going through many processes to increase productivity.

Contents of the invention

A thin plate forming die with a negative angle forming part of the present invention completes thin plate forming when the second die moves along a straight line and engages with the first die, and is characterized in that it includes: a cylindrical rotating shaft with an axial slot The modules are rotatably installed in the first mold, a negative-angle forming part is formed on the edge of the slot of the rotating module, and a sliding module with a negative-angle forming part is installed in the form opposite to the above-mentioned rotating module. On the second mold, an automatic reset device installed on the first mold is used to rotate and contract the rotary module to ensure that the workpiece can be unloaded from the first mold after forming, and one of the curved negative angle forming parts utilizes a Rotary block machining with several cylindrical rotary block segments of different diameters.

In this environment, therefore, the present invention relates to a sheet forming die for forming a curved negative angle forming portion using a rotary block having several cylindrical rotary block segments of different diameters.

From the perspective of mold making, the diameter of the rotary module should not be too large, for example, about 320mm. For very curved workpieces, the curved portion is machined with a rotary block consisting of several rotary block segments of different diameters.

Along the swivel axis, this diameter varies as required at different locations according to the degree of curvature of the workpiece. Special consideration must be given to the size of the diameter of the swivel block so that the negatively shaped portion of the swivel block does not become unduly sharp. Since, if the negative angle forming part is too sharp, the strength will be poor, so care should be taken not to make it 30° or less.

If a series of rotary modules are used, when the rotary modules rotate, the end faces of adjacent rotary modules interfere with each other at the joint surface, but the mold of the present invention completely avoids this interference, because a rotary module is used in the present invention module.

Description of drawings

Fig. 1 is the top view of a specific embodiment of the present invention;

Fig. 2 is two cross-sectional views of the workpiece taken from position III-III in Fig. 1 before and after negative angle forming;

Fig. 3 is a longitudinal sectional view taken from III-III position in Fig. 1;

Fig. 4 is a left and right perspective diagram of a complete front pillar surface, which is an automobile sheet metal part;

Fig. 5 is a longitudinal sectional view, what represent is: be used for finishing the state when the patrix of the forming die of the negative angle forming of front column surface shown in Fig. 4 is in top dead center;

Fig. 6 is a longitudinal sectional view of the upper die of the forming die shown in Fig. 5, which descends to engage with the lower die;

Fig. 7 is a vertical sectional view, what represent is the state when the patrix of forming mold among Fig. 5 is in bottom dead center;

Fig. 8 is a longitudinal sectional view of the upper die, showing the state when the upper die rises and is positioned at its top dead center after the forming die shown in Fig. 5 completes negative angle forming.

Detailed ways

Now, the present invention will be described in more detail with reference to a specific embodiment shown in FIGS. 1-3.

As shown in Figure 1, the workpiece W formed by the forming die of the present invention is an automobile trunk lid surface. From a plan view, the concave arc curve part of the front edge of the trunk lid surface forms a negative angle, As shown in Figure 2, negative angle forming is to make the cross section shown in the above figure into the state shown in the figure below.

What Fig. 1 shows is the top view of the thin plate forming die, Fig. 2 is the state of the flange 1 before and after the workpiece W is formed, and Fig. 3 is a longitudinal sectional view taken from the position III-III in Fig. 1 .

The processing part of the workpiece W on the thin plate forming die is the rear edge of the trunk lid surface. It is very clear in Figure 1 that it is a section of convex contour viewed from the plane, and its two ends have a large forward movement. If only one Rotary modules for machining will require a rather large rotary module. But from the perspective of assembling the mould, it is actually impossible to increase the size too much, and the maximum diameter is about 320mm. Also, the angles of the flanges in the middle and at the ends are not the same, and there are cases where the negatively angled shaped portion of the swivel module becomes too sharp to maintain its strength. In the present invention, the rotary module is processed into: a small-diameter middle rotary module section located in the middle and large-diameter two-end rotary module sections located at both ends.

In FIG. 1 , at both ends of the small-diameter central rotary module segment 2 with CA as the rotation axis, a rotary module with a large-diameter side rotary module segment 3 is installed. It can be clearly seen from FIG. 3 that the large-diameter side rotary module segment 3 is concentric with the small-diameter central rotary module segment 2 , and its diameter is larger than the diameter of the small-diameter central rotary module segment 2 . For example, the diameter of the large-diameter side rotary module segment is 290mm, and the diameter of the small-diameter middle rotary module segment is 250mm.

The lower mold 5 has a support 8, which is fixed on the lower mold table 6 with bolts 7, and in the horizontal narrow and long groove 9 in the upper middle part of the support 8, it is supported with an axial slot 10 in a manner that allows it to rotate. Cylindrical large-diameter side rotary module 3 .

In the present embodiment, as shown in Figure 1, an air cylinder 11 is provided as the automatic reset device of the rotary module 4, needless to say, the automatic reset device is not limited to the use of air cylinders, like springs, hydraulic devices, linkages, modules, or the like Any mechanism similar to this can be used, and can be installed not only on the lower die, but also on the upper die.

A connection part 12 is fixed on the bottom surface of the small-diameter middle rotating module 2 and the end of the cylinder piston rod 15, the base of the cylinder is pivotally installed by a bracket 14, and the bracket 14 is fixed on the support 8 with screws 13. The above-mentioned connection parts 12 pivots are installed so that the piston rod 15 is contracted, so that the small-diameter middle rotating wheel 2 is reset. On the bottom of the elongated groove 9 of the support 8, there is a window-shaped slot for the rotation of the connecting part 12 therein.

A negative-angle forming portion 16 is formed on the edge portion of the slot 10 of the edge rotating module section 3 , and the rolling plate 17 is fixed on the surface opposite to the negative-angle forming portion 16 of the slot 10 with bolts 18 . The negative angle forming portion 16 of the large-diameter edge rotary module segment 3 is machined into a workpiece support portion 19 whose outer contour conforms to the contour of the bottom surface of the workpiece W to accommodate the workpiece W, a workpiece loading portion having the same contour as the bottom surface of the workpiece W 20, the upper part of which protrudes slightly outwards, and is connected with the workpiece supporting part 19 of the edge rotating module 3 of the support 8.

Upper mold 21 has a bearing 23, is fixed on the bottom surface of upper mold platform 22 with bolt 24, and wear-resistant plate 25 is fixed on the inclined surface of bearing 23 with bolt 26, and sliding module 27 is by guide plate (not marked in the figure) Hold and slide on the bottom surface of the wear plate 25 . The negative angle forming part 28 is fixed on the upper surface of the sliding module 27 with a bolt 29, and is located at a position where the sliding module 27 is opposite to the slot 10 of the edge rotation module 3 .

On the inclined upper surface of the sliding module 27 , the support plate 29 is fixed with bolts 30 . Between the support plate 29 and the support plate 31 fixed on the support 23, a compressed coil spring 32 is installed, and the spring presses the sliding module 27 to the outside of the mould.

Above-mentioned helical spring 32 is sleeved on the outside of the locating pin 33 that is screwed into the support plate 31 li, and the end of above-mentioned locating pin 33 allows a thrust plate 34 that is fixed on the opposite side with support plate 31 to pass through above.

When the upper die 21 rises, the sliding module 27 moves to the outside of the die until the support plate 29 contacts the thrust plate 34 under the elastic force of the coil spring 32 .

Although not shown in the figure, in order to firmly support the workpiece W, the positioning part of the workpiece W is installed on the lower mold 5 and the upper mold 21, as described in the conventional example, as a backing plate for pressing the workpiece W. Installed on the lower mold 5. However, since these would complicate the illustration and obscure the point of the present invention, positioning parts and backing plates are omitted.

In the middle of the workpiece W, the small-diameter middle rotary module segment 2 is marked by a long and two short dotted lines in the figure, and the rest are almost the same as the large-diameter rotary module.

The working process of the thin plate forming die will be described below.

The state shown in FIG. 3 is the bottom dead center state, and corresponds to FIG. 7 in the conventional example.

In the present invention, although not illustrated, as shown in FIG. During this process, the middle rotary module 4 rotates and shrinks under the action of the cylinder 11 .

Next, as shown in Fig. 6 of the conventional example, in the upper mold 21, the inclined plane 41 of the sliding module 27 and the rolling plate 17 do not cause the sliding module 27 and the small-diameter middle rotating module 2 and the large-diameter side rotating module section 3. When the negative angle forming parts 16 interfere with each other, they come into contact, driving the small-diameter middle rotary module 2 and the large-diameter side rotary module segment 3 to rotate counterclockwise (the rotation direction in the conventional example is opposite to that in this embodiment).

As the upper mold 21 further descends, the sliding module 27 pushed towards the outside of the mold against the elastic force of the coil spring 32 moves laterally to the right under the action of the module, reaching the state shown in Figure 7 of the conventional example, that is, 3 states shown. The negative-angle forming parts 16 on the rotated small-diameter middle rotating module segment 2 and the large-diameter side rotating module segment 3 cooperate with the negative-angle forming parts 28 on the sliding module 27, and the negative angle forms the workpiece W.

After the negative angle is formed, the upper mold 21 begins to lift, and the sliding module 27 is pushed by the coil spring 32 toward the outside of the mold and moves to the left. As shown in FIG. Do not interfere with each other.

On the other hand, when the constrained sliding module 27 is lifted, the cylinder 11 will shrink the piston rod 15, and the small-diameter middle rotary module section 2 and the large-diameter side rotary module section 3 turn leftward, so that the lower mold 5 When unloading the workpiece W that has formed a negative angle, the removal of the workpiece W does not interfere with the negative angle forming part 16 of the small-diameter middle rotary module segment 2 and the large-diameter edge segment rotary module segment 3 .

The invention relates to a forming die having a forming portion forming a negative angle when a second die is moved linearly into engagement with a first die. In the thin plate forming die, a cylindrical rotary module with an axial slot is rotatably installed in the first mold, a negative angle forming part is formed on the edge of the slot of the rotary module, and a negative The sliding module of the corner forming part is installed on the second mold in the form opposite to the above-mentioned rotating module, and an automatic reset device installed on the first mold is used to make the rotating module rotate and shrink, so as to ensure that the workpiece can be moved from the second mold after forming. Since the thin plate forming die is designed to process an extremely curved negative-angle forming part with a rotary module-the rotary module is assembled from several cylindrical rotary module segments with different diameters, so that it is possible to use a forming It is possible to process extremely curved negative-angle forming parts, and it is also possible to reduce the number of processes and improve processing accuracy.

In particular, the thin plate forming die according to the present invention is suitable for forming negative angle forming of the arc-curve part which is convex outward when viewed from a plan view. This is because: the flange to be processed will produce wrinkles when being processed due to its outward protrusion, thereby becoming a shrinkage, so the bottom pushing process is required. In the present invention, since these rotating modules are processed into one , so high-precision bottom pushing processing becomes possible.

Since an extremely curved negative-angle forming section is processed into multiple diameter parts in the present invention, it can be considered to avoid excessively sharp negative-angle forming parts on the rotating module and avoid insufficient strength of the rotating module.

In addition, if several rotary modules are used, when the rotary modules rotate, the end faces of the adjacent rotary modules interfere with each other at the joint surface, but the mold in the present invention completely avoids this interference, because only one rotary module is used in the present invention. module.

Claims (1)

1. A thin plate forming die with a negative angle forming part, when the second die moves along a straight line and engages with the first die to complete the thin plate forming, it is characterized in that it includes: a cylindrical rotary module with an axial slot Installed in the first mold in a rotatable form, a negative angle forming part is formed on the edge of the slot of the rotary module, and a sliding module with a negative angle forming part is installed in the second mold in the form opposite to the above rotary module. On the mold, an automatic reset device installed on the first mold is used to rotate and contract the rotary module to ensure that the workpiece can be unloaded from the first mold after forming, and one of the curved negative angle forming parts utilizes a rotating Modular processing, the rotary module has several cylindrical rotary module segments of different diameters.

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