JPH0442013Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The disclosed technology belongs to the technical field of the structure of an apparatus that performs shaping such as bending of ultra-thin bag-shaped workpieces such as the lamp top part of the front fender panel of an automobile. .

Therefore, in this invention, a guide cam and a processing cam are provided on a base cam which is slidably provided in the front and rear directions on the lower die table, and a guide cam and a processing cam are provided so as to be relatively movable upward.
This invention relates to a bending processing device for molding ultra-thin bag-shaped workpieces such as lamp tops of front fender panels of automobiles, in which the upper die is provided with a predetermined number of fixed cams and pads for the workpieces, and in particular,
The guide cam has a cam follower correspondingly engaged with one fixed cam provided on the rising upper mold,
It is pivotally supported by a pin provided on a base cam and is swingable, and has a curved edge on the die side, and is adapted to form a side lower flange of an ultra-thin bag-shaped workpiece.
This invention relates to a bending processing device for forming ultra-thin bag-shaped workpieces, in which a punch-side curved blade is attached to one processing cam so that it can move forward and backward via a gas cylinder that absorbs excessive processing force.

<Prior Art> As is well known, there are many large mechanical devices such as automobiles, ships, and aircrafts in which panels are molded and assembled, and the panels assembled in these devices have fairly complex shapes. Therefore, in order to form processed panels having such complicated shapes, a bending device or a bending device using a cam mechanism is used.

Such a bending processing device includes, for example,
The inventions published in No. 158318 and the inventions published in Utility Model Application No. 198452 (1983) have been developed and put into practical use.

Therefore, in the molding process of this type of panel, the aerodynamic characteristics based on research from the hydrodynamic viewpoint of the product equipment,
Various innovative shape changes are now required due to design requirements, and accordingly, molding devices are also required to have stricter design aspects.

For example, the shape of the lamp top portion 4 around the side lamp 3 of the front fender panel 2 of the automobile 1 as a large mechanical device as shown in FIGS. 11 to 16 may also be shaped as shown in FIGS. 11th and 1st due to its heavy and blunt shape with large bends.
Shapes that conform to sharp aerodynamics, as shown in Figures 2 and 13, have become very popular, and as a result, shapes that are difficult to mold as shown in Figures 14 to 16 have become popular. Processing technology that accompanies this process is required.

In order to form the lamp top portion 4 of the sharp front fender panel that follows the aerodynamic shape, first, as shown in FIGS. 5 and then the first
As shown in Fig. 8, a hole is punched for the outer diameter to form a workpiece 6. Next, as shown in Figs. As shown in FIG. 2, an ultra-thin bag-shaped workpiece 9 was formed by bending.

As shown in FIG. 21, the shape of the tip of the ultra-fine bag-like workpiece 9 that has been subjected to the bending process is a severe, ultra-fine bag-like shape with an extremely acute angle where the flanges 10, 10' come together at the tip. Moreover, deformation and bending of the flanges 10, 10' is essentially not allowed due to the relationship with the hood flange and fender flange.

Therefore, in the conventional press forming of the ultra-thin bag-shaped workpiece 9, a bending processing device 11 shown in FIGS. cam 16
The workpiece 7 after the offset bending process is set at a predetermined position at a predetermined angle θ with respect to the horizontal plane, and the guide cam 16 of the base cam 13 moves forward by lowering the fixed cam 15 provided on the upper mold 14. Then, the pad 17 provided on the upper mold 14 descends to position the workpiece 7, and then the fixed cam 1
5 descends, the processing cam 18 slides relative to the base cam 13 and the punch side curved blade 2
0 cooperates with the pad 17 to bend the tip of the extremely thin bag-shaped workpiece 7 from the outside.

During this time, the process line of the bending processing device 11 is the first
The process is as shown in Figure 0.

As shown in FIG. 31, in the process of bending A and B by the curved blade on the die side, the curved blade on the die side and the curved punch side are caught on the panel, so that the curved edge on the die side and punch side curve As shown in Figure 32, this can be dealt with by letting the curved edge of the die side escape by an amount d.
Such movement countermeasures in the bending process increase the number of machining steps in the manufacturing process, which has the disadvantage of increasing costs. There was a negative point that the control was also a hassle.

<Problems to be solved by the invention> However, in the above-mentioned curve forming process, first, as shown in FIG. The curved blade 19 moves forward, and then the punch side curved blade 2
0 moves forward to perform side bending of the flanges 10 and 10', when the die side curved blade 19 enters the back surface of the workpiece 7, the workpiece 7 has an inclination angle less than the predetermined set angle θ, and the flange portion floats. In such a state, the die side curved edge 19 is attached to the flange 10,
10', the flange portions 10, 10' may be deformed, which may lead to product defects.

In response to such troubles on the hood side, on the lamp side as well, if the workpiece 7 is even slightly misaligned, the flange 10,
The die-side curved blade 19 interferes with the die side curved edge 10', causing a similar catch, causing deformation of the product, preventing it from being formed as designed, and potentially reducing the reliability of the product.

In order to avoid trouble caused by the interference between the die side curved blade 19 and the punch side curved blade 20 with the flanges 10, 10' of the workpiece 7 on the hood side or the lamp side, the die side curved blade 19 and the punch side curved blade 20 are 1
9 and the punch side curved blade 20, and the die side curved blade 19 and the punch side curved blade 2 due to the trajectory of the escape and intrusion.
If you make the curved blade body of 0 into an acute shape in advance,
If the force strength is weakened and an overload is applied during pressing, there is a risk of breakage, which is an inconvenience.

Moreover, as shown in FIG. 26, the flanges 10, 1
Since the bending direction of the 0' portion and the flange angle do not match, the die side curved blade 19 and the punch side curved blade 2
Side pressure is applied to the curved blade body of 0, resulting in high load.
There was an inconvenience that the curved blade body was damaged.

If the curved blade is made to escape in order to absorb the deviation, as shown in Figs. 29 and 30, the so-called alignment at the profile 11 portion of the lamp top portion 4 will become poor, and a good profile as designed will not be obtained. I had a problem where I couldn't do it.

Therefore, as shown in FIGS. 29 and 30,
There is a drawback that it is difficult to form an ultra-fine bag-like workpiece with a tip angle larger (or smaller) than the limit forming angle of 40° of Profile 11, and there is a strong need for ultra-fine bag-like design shapes from users. There was a negative point that I couldn't deal with it.

<Purpose of the invention> The purpose of this invention is to improve the sharpness of the tip of an ultra-thin bag-like workpiece, such as the shape of the tip of the lamp top of the front fender of an automobile, which has a novel aerodynamic shape and a sharp design based on the above-mentioned conventional technology. When bending shaped parts, etc., the danger of breakage due to the penetration of the curved blade on the die side or the punch side, and the problem of poor profile alignment are technical issues that need to be solved, and we have developed an ultra-thin bag. It is possible to skillfully follow changes in the design shape of the tip angle of a shaped workpiece, and it does not cause damage to the curved blade body of the die side curved blade or punch side curved blade, and the bending against the flange of the tip It is an object of the present invention to provide an excellent bending processing device for forming ultra-thin bag-shaped workpieces that prevents deformation and variation due to catching of blades, increases reliability of the product, and benefits the field of forming technology application in the machine manufacturing industry. It is something.

<Means for solving the problem> In order to solve the above-mentioned problem, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claim, is based on a guide cam and a pair of base cams provided on the lower mold stand. In the bending processing device for forming an ultra-fine bag-like workpiece, the guide cam is provided with a fixed cam and a pad on the upper die.
It has a cam follower corresponding to two fixed cams, which is swingable about a pin pivotally supported on the base cam, and has a curved blade on the die side, while a curved blade on the punch side is connected to one of the processing cams via a gas cylinder. This is achieved through the use of additional technical measures.

<Function> Therefore, when machining the flange part of an ultra-thin bag-shaped workpiece such as the lamp top part of a front fender panel of an automobile with a sharp design of an aerodynamic shape, the base cam installed on the lower die table is The base cam is equipped with a relatively slidable guide cam and a processing cam, while the upper mold is equipped with a pair of fixed cams and a pad for the workpiece. When the upper die is lowered relative to the lower die table, one fixed cam is pivoted to a pin of the base cam and engages with a cam follower of a swingable guide cam, and slides the guide cam into a predetermined position. The die side curved blade provided on the guide cam enters the lower side of the set workpiece, and when the upper die further descends, the pad descends to position the workpiece, and further, when the other fixed cam descends, The processing cam engages with the processing cam and moves forward, and the punch side curved blade provided on the processing cam moves forward, and the fixed cam rotates the guide cam in a predetermined position relative to the pin via the cam follower of the guide cam. By operating the curved blade on the die side, the curved blade on the die side and the curved edge on the punch side bend the workpiece into an ultra-fine bag shape, and the processing cam and guide cam do not work together, but operate independently, so that the workpiece can be processed under optimal conditions. When the bending process is performed and a large bending load is applied due to the lowering of the fixed cam, the punch side curved blade moves back against the gas cylinder, escaping a predetermined amount slightly and absorbing the excessive applied force. Therefore, the body of the curved blade on the punch side will not be damaged, and the curved blade on the die side will not be strained, so the strength will be increased and the bending of the die side curved blade and the punch side curved blade will be improved. Damage to the blade body is avoided, and the pad comes into pressure contact with the workpiece when the guide cam starts, ensuring reliable positioning and eliminating variations, improving product accuracy. Accurate operation also ensures that the flange does not catch or become deformed.

<Example> Next, an example of this invention will be described below based on FIGS. 1 to 9. Furthermore, the 22nd,
The same parts as in FIG. 23 will be explained using the same reference numerals.

In the embodiment shown in FIGS. 1 to 7, 12 is a lower mold, and a base cam 13' is provided on the upper surface of the lower mold so as to be slidable back and forth in the left and right directions in the figure. A processing cam 18 is provided so as to be relatively slidable,
A guide surface 2 for the workpiece 7 is provided on the upper surface of the base end.
7 is formed.

Also, a pin 24 is provided at a predetermined portion of the base cam 13'.
A guide cam 23 is swingably provided via the
A cam follower 22 is supported by a pin at a predetermined upper portion thereof.

Further, fixed cams 15 and 25 are provided on the upper mold (not shown), and one of the fixed cams 15 is capable of engaging with the processing cam 18 via a cam surface.
The cam surface at the lower end of the other fixed cam 25 is engageable with the cam follower 22 of the guide cam 23.

Further, the upper die is provided with a pad 17 that faces the guide surface 27 of the base cam 13'.

A die side curved blade 19' is provided at the upper end of the guide cam 22, and a punch side curved blade 20' is provided on the processing cam 18 opposite to the die side curved blade 19'.
The flange 10 of the ultra-thin bag-shaped portion for the workpiece 7,
10' is bent.

In addition, in this invention, a nitrogen gas cylinder 26 as a gas cylinder is provided on the processing cam 18 at the rear of the punch side curved blade 20' to absorb excessive bending force applied to the punch side curved blade 20'. It is made possible to do so.

Further, the fixed cam 25 provided on the upper die is given the function of a regular stopper and back-up for the die side curved blade 19', and the guide cam 23 and the guide surface 27 are
The mold is interposed between the mold and the mold as the upper mold is lowered.

In the above-mentioned configuration, when the bending processing device 11' for forming the ultra-fine bag-like workpiece is in the standby position in which preparation is completed, as shown in FIGS.
As shown in Figures 8, 19 and 20, the panel work 7 of the lamp top part 4 of the front fender of an automobile is formed by drawing, punching, and bending.
on the guide surface 27 of the base cam 13',
That is, as shown in FIGS. 22 and 23, when the mold is placed at a predetermined angle of θ with respect to the plane and the upper mold (not shown) is lowered, the base cam 13' is moved in cooperation with the fixed cam 15. As it moves forward, the pad 17 descends and the workpiece 7 passes through the processes shown in Figs. 3 and 5, as shown in Figs. 4, 7, and 1.
The fixed cam 25 descends and engages with the cam follower 22 of the guide cam 23, and the guide cam 23 is pivoted forward about the pin 24 to move the die side curved blade 19' to the workpiece. Try to move it forward inside the 7.

Then, the fixed cam 25' is lowered to be interposed between the base cam 13' and the guide cam 23 and backed up.

On the other hand, as the fixed cam 15 descends, the processing cam 1
8 engages and moves forward, and its punch-side curved blade 20' moves forward to start the side-curve forming operation together with the die-side curved blade 19'.

During this period, even if the lowering of the upper mold becomes an overstroke and excessive pressing force is applied to the die side curved blade 19' and the punch side curved blade 20', the punch side curved blade 20'
On the side, the nitrogen gas cylinder 26 elastically retreats and absorbs this, so that the curved blade body of the punch side curved blade 20' is not damaged, and the die side curved blade 19' is prevented from backing up the fixed cam 25. There is no risk of damage to the curved blade body as it is reinforced.

In this way, the bending of the lamp top portion of the front fender of the automobile is performed as designed, deformation of the flanges 10, 10' is avoided, and
Sharpening of the tip can be avoided, and as a result, the profile 11 can be easily passed, and the 29th and 3rd
It is also possible to bend to a shape in which the inclination angle θ ₁ or θ ₂ of the tip portion shown in FIG. 0 is larger than 40°.

Incidentally, the process lines of each of the above-mentioned processing cams are as shown in FIG.

In the above-mentioned embodiment, the gas cylinder 26 used nitrogen gas, which is an inert gas, to prevent oxidation of each mechanical part, but various embodiments such as using a cylinder of other inert gas can be adopted.

Moreover, the present invention is applicable not only to ultra-thin bag-like workpieces such as lamp tops of front fender panels of automobiles, but also to bending of panels of similar mechanical devices.

<Effects of the invention> As described above, according to this invention, in a device that basically performs side bend forming processing of ultra-thin bag-shaped workpieces such as the lamp top part of a front fender panel of an automobile, the side bending of the die that enters the flange from the back side of the workpiece is performed. By providing a guide cam with a blade so that it can rotate with respect to the base cam, when the curved blade on the die side enters, it does not interfere with the flanges provided at an acute angle on both sides of the tip of the workpiece, causing engagement such as getting caught. Therefore, there is an effect that the flange part is deformed and the workpiece is not deformed and bent, and the die side curved edge provided on the processing cam that engages the fixed cam is prevented from entering the workpiece. Also, even when the pressing force of the pad is large, an excellent effect is achieved in that no unreasonable load is applied and no damage occurs to the curved blade body.

In addition, since the pad presses the workpiece when the guide cam rotates, the product can be accurately positioned during side bend molding, and there is no variation in the product, resulting in an excellent effect of increasing the reliability of the product accuracy.

Furthermore, since the relief amount of the punch side curved blade provided on the processing cam can be minimized by using a gas cylinder, the strength of the curved blade body of the punch side curved blade is increased, and damage is prevented. It becomes less, and
The effect is that damage is avoided.

In addition, since the guide cam and processing cam do not work together and operate independently, it is possible to select the penetration of the die-side curved blade and the punch-side curved blade into the workpiece, improving the accuracy of the bending process. The effect is produced.

Further, since the amount of inclination of the workpiece to be set in the apparatus can be set not only in the horizontal direction but also in the height direction, there is an effect that the degree of freedom in setting is increased.

This reduces the chance of each die-side curved blade or punch-side curved blade catching on the flange of the ultra-fine bag-shaped workpiece, allowing the flange to be freely adjusted to an angle of inclination of 40° or more. It is now possible to mold angular products, which has the excellent effect of increasing the degree of freedom in design.

In this way, the damage to the curved blade is reduced, which improves the durability of the entire device, which reduces the initial cost, and also reduces the need for troublesome work such as maintenance, inspection, and maintenance, and reduces running costs. There is also the advantage of being

[Brief explanation of the drawing]

1 to 9 are explanatory diagrams of one embodiment of this invention, and FIG. 1 is a schematic longitudinal sectional view of the entire bending processing device;
Figures 2, 3, 4, 5, 6, and 7 are partial cross-sectional views,
Fig. 5 is a cross-sectional view of the same part, Fig. 8 is a sectional view of the bending process, Fig. 9 is a machining process diagram, Fig. 10 is a bending process diagram based on the conventional technology, and Fig. 11 is a process diagram of the bending process. Fig. 12 is a perspective view of the workpiece, Fig. 13 is a schematic side view, Fig. 14 is an enlarged overall side view of the workpiece to which this invention is based based on the prior art, and Fig. 15 is the perspective view. 16 is a schematic side view, FIGS. 17 to 21 are perspective views of the processing process for the target ultra-fine bag-shaped workpiece, FIG. 22 is a sectional view of a bending processing device based on the conventional technology, and FIG. 23 is the same as above. FIGS. 24 to 28 are perspective views of the bending process of an ultra-fine bag-like workpiece, FIGS. 29 and 30 are plane and side views of the prior art and the ultra-fine bag-like work according to this invention, and FIGS. FIG. 32 is a perspective view of a bending process for an ultra-fine bag-like workpiece. 12...Lower mold, 13'...Base cam, 23...
...Guide cam, 18...Processing cam, 15, 25...
Fixed cam, 17... Padded, 7, 9... Extra-fine bag-shaped workpiece, 11'... Bending processing device, 22... Cam follower, 19'... Die side curved blade, 26...
Gas cylinder, 20... Punch side curved blade, 24...
Pin, 20'...Die side curved blade.

Claims (1)

[Scope of utility model registration request] In a bending processing device for forming an ultra-thin bag-like workpiece, in which a guide cam and a pair of processing cams are provided on a base cam provided on a lower mold table, and a fixed cam and a pad are provided on an upper mold, the guide cam is provided on the upper mold. It has a cam follower corresponding to one fixed cam, which is swingable with respect to a pin pivotally supported on the base cam, and has a curved edge on the die side, while one of the processing cams has a curved edge on the punch side via a gas cylinder. A bending processing device for forming ultra-thin bag-like workpieces, which is characterized by being equipped with a blade.