JPH0328970Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a press die, and particularly to a shifting cam mechanism for processing a workpiece from a plurality of directions.

Conventional technology As is well known, press working can perform various types of processing such as bending, shearing, punching, and drawing.
In addition, since the output of press machines has increased, various functions have been added to press dies to perform multiple types of processing such as bending and shearing in one process, thereby improving processing efficiency. For example, as shown in FIG. 6, it is a long member 1 with a U-shaped cross section (or a box-shaped cross section) that opens downward, and has flanges 2 and 3 bent upward at both ends thereof, and further has side walls. When a member having through-holes 4 in the parts thereof is manufactured by press working, upward bending of the flanges 2 and 3 and punching of the through-holes 4 are performed at the same time as the bending of the entire body.

In a press die that performs such so-called composite processing, the bending direction of the flanges 2 and 3 is opposite to the lowering direction of the upper die, and the punching direction of the through hole 4 is horizontal, so it is difficult to assemble a shifting cam mechanism. It is said to have a complex structure. To specifically illustrate this, FIG. 7 is a perspective view schematically showing a conventional shifting cam mechanism, in which the hole punch 5 is directed toward the side wall of the long material 1 that has been bent. Slide cam 6 moving forward
is attached to the front of the slide cam 6.
is configured such that when a fixed cam 7 attached to an upper mold (not shown) descends, it is pressed through both cam surfaces and moves forward. Also, long material 1
A push-up cam 8 for bending and forming the flange is disposed on the end side of the push-up cam 8 so as to be movable up and down, and a second push-up cam 8 for pushing up the push-up cam 8 by sliding toward the push-up cam 8 is disposed below the push-up cam 8. The slide cam 9 is arranged, and the second slide cam 9
second fixed cam 1 for pushing up toward the cam 8 side
0 is attached to the upper mold. Therefore, in the conventional shifting cam mechanism described above, each fixed cam 7, 1
0 descends together with the upper mold, the slide cam 6 is pushed and advanced, and the punch 5 punches the through hole 4.
By performing the punching process and moving the second slide cam 9 forward, the push-up cam 8 presses and
The flanges 2 and 3 are raised and bent upward.

Problems to be Solved by the Invention However, in conventional press dies, as mentioned above, the cam mechanism for upwardly bending the flanges 2 and 3 and the cam mechanism for punching the through hole 4, etc. Since each cam mechanism for machining in a different direction was made independent, the following problems arose. In other words, if each cam mechanism with different machining directions is made independent, each can be manufactured individually.
Because of their ability to be adjusted, it is considered advantageous, and has traditionally been done, to keep each cam mechanism independent in the field of press mold manufacturing. However, from the perspective of those who use and maintain press dies, the cam mechanism is independent and there are a large number of fixed cams, so the impact noise during press processing deteriorates the working environment and is unbearable. In some cases,
In other words, the cam mechanism in the press die changes the lowering movement of the upper die into a movement in a different direction, and since the fixed cam and slide cam are separated when not in operation, it is necessary to incorporate a shifting cam mechanism. With the press type, it is difficult to completely eliminate the impact noise when the fixed cam comes into contact with the slide cam and starts pressing it, so the problem is that the larger the number of fixed cams, the louder the impact noise becomes. occurs. Furthermore, if the cam mechanism were made independent as described above, the number of parts would increase, which would not only increase the cost of the cam mechanism, but also increase the size of the press die itself, increasing its cost. There is a problem that makes it difficult to manage.

Means for Solving the Problems In view of the above-mentioned circumstances, this invention was developed to replace one of the slide cams for processing operated by a fixed cam with the other in a press die that simultaneously performs press processing in multiple directions. The object of the present invention is to provide a shifting cam mechanism that is configured to act as a driving cam for a processing slide cam, has a small number of fixed cams, and has a simple configuration. In other words, the idea is to provide a processing slide cam on the lower mold that is operated by a fixed cam attached to the upper mold, and a drive cam surface that is inclined at a predetermined angle with respect to the direction of movement of the slide cam. and has a processing part that processes the workpiece, and is pressed by the driving cam surface as the slide cam moves, and processes the workpiece from a direction different from that of the slide cam. The feature is that the second slide cam is provided on the lower die.

Function: In other words, in this invention, when the fixed cam presses the first slide cam, the first slide cam presses the second slide cam. Therefore, a fixed cam for the second slide cam is not required.

Embodiment FIG. 1 is a perspective view showing the principle of an embodiment of this invention, and FIGS. 2 to 5 are views showing more concretely, and the press mold shown here is a
This is a configuration in which a long material 1 having the shape shown in the figure is press-formed. In other words, a workpiece 11 such as a steel plate is placed in a lower die 12.
A part 13 which is pressed against the mold and bent into a U-shaped cross section is attached to the upper die 14 so as to be movable up and down, and when the upper die 14 is at the upper limit position,
The part 13 is held in a depressed state relative to the upper mold 14 by an elastic body 15 such as a coil spring disposed between the upper end of the part 13 and the upper mold 14. A punching die 16 is arranged at a location corresponding to the through hole 4 in the lower mold 12, and a slide cam 17 that moves back and forth in the horizontal direction toward the punching die 16 is provided on the lower mold 12. . That is, the slide cam 17 is installed on the lower mold 12 via the slide plate 18 provided at the lower part thereof, and the hole punching die 16 is located on the front surface of the slide cam 17.
A punch 19 serving as a processing section is attached to a location corresponding to . Moreover, the slide cam 17 is
As shown in FIG. 5, the punching die 16 is moved by an elastic body 20 such as a coil spring placed between a receiving surface provided at a predetermined location in the lower part and a receiving surface provided on the lower mold 12 opposite thereto. In contrast, the rear end of the slide cam 17 has a
A passive cam surface 21 for advancing the slide cam 17 toward the punching die 16 is formed. As shown in FIG. 4, the cam surface 21 is a surface inclined downward toward the rear end at a predetermined angle (in FIG. 4, indicated by an angle θ ₁ with respect to the vertical line) with respect to the moving direction of the slide cam 17. A fixed cam 22 having a driving cam surface corresponding to the surface 21 on the lower end side is attached to the upper mold 14 facing downward.

Furthermore, the above-mentioned slide cam 17 is replaced by a fixed cam 22.
The flange 2 is a driven cam, but the flange 2,
The second slide cam (hereinafter referred to as a push-up cam) 23 having a bending edge for performing upward bending is configured to act as a driving cam. That is, a push-up cam 23 is arranged at a position corresponding to the end of the workpiece 11, and the push-up cam 23 is held by the lower die 12 so as to be movable up and down via a slide plate 24 attached to the side surface. Also, push-up cam 2
The tip of a guide pin 25 that penetrates a predetermined location of the lower die 12 from below is screwed into the lower die 12, and is pushed up by the elastic force of an elastic body 26 such as a compression coil spring placed between the lower end and the lower die 12. 23. A wedge portion 27 extending below the push-up cam 23 is formed at the end of the slide cam 17 on the push-up cam 23 side, and by attaching a slide plate 28 to the upper surface of the wedge portion 27, the tip A cam surface 29, which is a second driving cam surface, is formed to be inclined downward at a predetermined angle θ to the side.

Therefore, in the above press mold, when the upper mold 14 descends, the pad 13 first presses and fixes the workpiece 11 to the lower mold 12, and
The workpiece 11 is bent into a U-shaped cross section. Thereafter, the upper mold 14 further descends while compressing the elastic body 15 provided on the upper part of the pad 13. As a result, the slide cam 17 is pushed by the fixed cam 22 and moves forward, and the through hole 4 is punched by the punch 19. Perform punching process. At the same time or in succession, the cam surface 2 of the wedge portion 27 as the slide cam 17 moves forward.
Due to the action of 9, the push-up cam 23 is pushed upward, and as a result, the push-up cam 23 is pushed up against the flange 2,
Perform 3 upward bends. In the above-described cam mechanism, the punching of the through hole 4 and the flange 2,
Two types of machining with different machining directions, ie, upward bending in No. 3, can be performed with a configuration provided with a single fixed cam 22.

Note that if the upper mold 14 is raised, the fixed cam 22
Since the pressing force caused by the sliding cam 17 is eliminated,
is moved backward by the elastic force of the elastic body 20 and returns to its original position, and the pushing up force acting on the push-up cam 23 disappears, so the push-up cam 2
3 is pulled down to the lower limit position by an elastic body 26 provided between the lower end of the guide pin 25 and the lower mold 12.

By the way, in the above-mentioned embodiment, the machining directions are two directions, horizontal and vertical, but this invention is not limited to the above-mentioned embodiment, and may be a diagonal direction that is inclined with respect to the horizontal direction or the vertical direction. There may be two or more processing directions. These machining directions can be set by appropriately setting the direction and shape of the cam surface.

Effects of the invention As is clear from the above explanation, according to this invention, the slide cam, which is a driven cam for the fixed cam, acts as a driving cam for the other slide cams. The number can be significantly reduced compared to the conventional method, and as a result, impact noise during press working can be reduced. Also, according to this invention, since the number of parts can be reduced, the shifting cam mechanism can be made inexpensive and compact.
Along with this, press molds can also be made cheaper and more compact, making maintenance and handling of the press mold easier.Furthermore, since the space occupied by the shifting cam mechanism is reduced, there is greater freedom in mold design. It has an increasing effect.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the principle of an embodiment of this invention, Fig. 2 is a plan view showing an embodiment of this invention in more detail, and Fig. 3 is a cross-section taken along the - line in Fig. 2. Figure 4 is a cross-sectional view taken along the - line in Figure 2, Figure 5 is a cross-sectional view taken along the - line in Figure 2, and Figure 6 shows an example of the shape of a pressed product to be obtained by press working. FIG. 7 is a perspective view showing the principle of a conventional shifting cam mechanism. 11...Work material, 12...Lower die, 14...Upper die, 17...Slide cam, 19...Punch, 2
1, 29...cam surface, 22...fixed cam, 23...
...Second slide cam (thrust cam).

Claims (1)

[Scope of utility model registration request] A fixed cam having a driving cam surface inclined at a predetermined angle with respect to the downward direction of the upper mold is attached to a predetermined location of the upper mold of the upper mold and the lower mold that are paired with each other,
In a shift cam mechanism in a press die, in which a slide cam is provided in a lower die, the slide cam is provided with a passive cam surface corresponding to the drive cam surface and a processing section for processing the workpiece. The second cam is tilted at a predetermined angle with respect to the direction of movement of the cam.
A drive cam surface is provided, and a second processing section that processes the workpiece from a direction different from the processing section, and as the slide cam moves, the second drive cam surface 1. A shifting cam mechanism for a press mold, characterized in that a second slide cam that is operated in a pressing operation is provided on a lower mold.