JPS6130743Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a press-type offset cam mechanism in a press processing device.

Conventionally, in press working, if the workpiece has a negative angle surface (an inwardly curved surface of the workpiece that cannot be bent or drawn in one press action), simple processing is required. In this method, the posture of the workpiece was changed manually to eliminate the negative angle surface, and the workpiece was formed using a general forming method.

FIG. 3 shows a general press die in which the posture of the workpiece itself is manually changed by changing the negative angle surface of the workpiece. The functions of the constituent elements of the workpiece 1 after completion of molding, the workpiece 1' before molding, the lower mold 2, the upper mold 3, the plate holder 4, and the spring 5 will be explained below. After the workpiece 1' is loaded into the lower mold 2, a spring 5 is applied so that the lower mold 2 and the workpiece 1' are brought into close contact with each other by a plate holder 4 built into the upper mold 3 fixed to the press machine. After being sufficiently compressed, the upper mold curved blade 6 starts molding, and the machine further operates to the bottom dead center, completing the press working. Elements 1 to 5 in Figure 3 are shown in Figure 4~
Also in FIG. 6, the same symbols and the same functions are used.

However, as press processing has become faster and more automated, this processing method is no longer suitable, and the fourth
~The press die shown in Fig. 6 has also been proposed.

Figure 4 shows a cam 6 and a cam driver 7 that transform the movement of the press machine to form the negative angle surface of the workpiece.
This shows a press mold having a separate drive source, for example, a hydraulic cylinder 9, for guiding the posture of the workpiece before and after molding. The loaded workpiece 1' is held in the posture of the guide block 8' by the action of a cylinder 9, which is a separate drive source. From this state, the press machine further descends, and after the spring 5 is sufficiently compressed, the cam 6' and cam driver 7' come into contact, and the cam 6' moves due to the direction changing action of the cam driver 7', and the press machine The cam 6 and cam driver 7 operate until the machining is completed at the bottom dead center of the machine. When the press machine is raised, after the plate holder 4 is separated from the workpiece 1, the guide block 8 returns to the position 8', and the cam 6 returns to the position 6' due to the action of the cam return spring 10.
Pressing is completed.

FIG. 5 shows a multiple cam type structure in which a cam 8 and a cam driver 9 serve as the workpiece posture guide mechanism, similar to the cam 6 and cam driver 7 as separate drive sources in FIG. The operation of each component is the same as that in FIG. 4, so a description thereof will be omitted.

FIG. 6 shows a cam combination structure in which a machining cam 6 and a workpiece posture guide cam 8 are constituted by one cam driver 7, which is a double cam type structure. The workpiece 1' is introduced at the position of the guide cam 8', and as the press machine descends, the guide cam operates to the position 8, completes guiding the workpiece, and is held there. Furthermore, the press machine descends, the plate presser 4 comes into contact, the spring 5 is sufficiently compressed, the guide cam 8 has already been activated, and after a certain period of time has passed, the movement of the processing cam 6, which has started to operate, progresses. Pressing is completed at the bottom dead center of the press machine. The actions of the components after the bottom dead center are as follows: First, after the compression of the spring 5 is released, the workpiece 1 and the plate holder 4 are separated, and at approximately the same time, the machining cam 6, which is ahead of the workpiece 1, moves 6' Return to position. Further, the guide cam 8 also returns to the position of the guide cam 8' at approximately the same time, behind the working cam 6, and the press working is completed.
In this structure, the workpiece is returned by the processing cam 6
This is done by a return claw 12 fixed to the.

As mentioned above, the mechanism shown in FIGS. 4 to 6 requires a means for separating the negative angle portion of the workpiece after forming from the press mold. In the example shown in FIG. 4, a separate drive source (cylinder 9) is used to move the negative angle portion of the workpiece away from the normal guide position. Also,
In the examples shown in Figures 5 and 6, a shifting cam mechanism is installed, which is the same drive source as in press working, but in Figure 5, the driver is placed in the front and back direction of the die (left and right in the figure), and The workability of loading objects is significantly reduced, and the cam structure becomes complicated in both Figures 5 and 6.
Both are expensive.

The purpose of this invention is to guide the posture of the workpiece using a single drive source in a press-type offset cam mechanism of a press processing device, and to avoid the need for complex structures such as multiple cam types or double cam types. It is an object of the present invention to provide a press-type offset cam mechanism that is simple, inexpensive, and has good workability without being complicated.

Hereinafter, the structure and effects of the present invention will be described in detail based on the embodiments shown in the accompanying drawings.

Figures 1 and 2 show an embodiment of the press-type offset cam mechanism of the present invention. Figure 1 shows the press machine at the top dead center, and Figure 2 shows the press machine at the bottom dead center. Each state is shown. In these figures, 1 is the workpiece after completion of molding, 1' is the workpiece before molding, 2 is the lower die fixedly installed, and 3 is the workpiece after molding is completed.
Reference numeral 4 indicates an upper die movable in the vertical direction, and 4 indicates a workpiece plate holder attached to the upper die 3 via a spring 5. A cam driver 7 as shown is fixed to the upper mold 3, and a processing cam 6 is provided on the lower mold 2 so as to be able to slide in the horizontal direction. When the upper mold 3 descends, the cam driver 7 comes into contact with the cam surface of the processing cam 6, and moves the processing cam 6 to the left in the figure against the force of the spring 10. A connecting rod 9 extending from the left side of the machining cam 6 and passing through the workpiece guide block 8 is fixed to the machining cam 6. A stopper 9' is provided at the left end of the connecting rod 9. The guide block 8 has a hole for passing the connecting rod 9 and is itself able to slide freely over the lower mold 2. A spring 11 is provided between the processing cam 6 and the guide block 8 and around the connecting rod 9, and constantly presses the guide block 8 to the left side.

In FIG. 1, a workpiece 1' prior to forming is placed in the position shown by hand or other suitable means. When the upper die 3 and the cam driver 7 descend, the processing cam 6 slides to the left in the figure against the force of the spring 10. At this time, the biasing force of the spring 11 causes the guide block 8 to move to the left while contacting the stopper 9' of the connecting rod 9, thereby moving the workpiece 1' before forming to the left. When the guide block 8 comes into contact with the stopper 13 fixed to the lower die 2, the workpiece 1' to be formed is guided to a predetermined processing position. That is, the right edge of the workpiece 1' is in contact with the lower mold 2, and the left edge is in contact with the guide block 8.
You will be guided to a state where you are in contact with. When the upper die 3 of the press machine further descends, the plate holder 4 comes into contact with the workpiece 1'. As a result, the workpiece 1 is stably held between the guide block 8, the processing cam 6, and the plate holder 4. After the spring 5 is sufficiently compressed, the processing cam 6 comes into contact with the workpiece 1', and the negative angle surface of the workpiece 1 is pressed until the bottom dead center of the press machine shown in FIG. Complete.

In the upward movement of the press machine, first, the cam driver 7 rises, and the processing cam 6 starts to move backward to the right side due to the biasing force of the spring 10.
is separated from the workpiece 1, and after a certain stroke, the plate holder 4 is also separated from the workpiece 1. During this time,
The connecting rod 9 moves in the same way as the machining cam 6, but the free sliding guide block 8 has its position fixed by the action of the spring 11 until the machining cam 6 and plate holder 4 complete their operations. There is. Furthermore, with the upward movement of the press machine, the stopper 9' of the connecting rod 9 comes into contact with the guide block 8, and the guide block 8 is slid to the right in the figure, and after a certain stroke, the return pawl 12 fixed to the processing cam 6 is moved. contacts the forming end of the workpiece 1 and starts moving the workpiece 1 back to the right side. When the press machine reaches the top dead center, as shown in FIG. In this state, the formed workpiece 1 is removed from the press machine by hand or other suitable means, and the press cycle is completed.

As explained above, the press-type near-cam mechanism of the present invention uses a single drive source to guide the posture of the workpiece, and does not require multiple cam types or double cam types as in conventional examples. It is simple, inexpensive, and has good workability.

[Brief explanation of drawings]

Fig. 1 shows the press-type off-center cam mechanism of the present invention in the top dead center state, Fig. 2 shows the press-type off-center cam mechanism of the same invention in the bottom dead center state, and Fig. 3
~ Figures 6 are diagrams showing press dies of the prior art, respectively. 1...Workpiece, 2...Lower die, 3...Upper die, 6
...Processing cam, 7...Cam driver, 8...Guide block, 9...Connecting rod, 9'...Stopper, 1
0, 11... Spring, 12... Return pawl, 13... Fixed stopper.

Claims (1)

[Scope of utility model registration request] A cam driver 7 is fixed to the upper mold 3 of the press mold which can be moved in the vertical direction, and a processing cam 6 is provided which can be slid horizontally in one direction against the first spring 10 by lowering the cam driver. A connecting rod 9 is fixed to the cam, extending in one horizontal direction, passing through the guide block 8, and having a stopper 9' at the other end.
A second spring 11 is provided between the guide block and the processing cam, and when the processing cam 6 and the connecting rod 9 move in one horizontal direction as the upper die 3 descends, the second spring 11 is first moved. The biasing force causes the guide block 8 to slide horizontally in one direction until it comes into contact with the fixed stopper 13 to guide the workpiece 1' to a predetermined forming position, and then the processing cam 6 moves the workpiece 1' The negative angle surface is machined, and as the upper mold 3 rises from the bottom dead center, the processing cam 6 and the connecting rod 9
When moving in the other direction horizontally, first the first spring 10
The machining cam 6 is separated from the workpiece 1 due to the urging force, and then the stopper 9' of the connecting rod 9 comes into contact with the guide block 8, and then the guide block is moved in the other horizontal direction and fixed to the machining cam 6. A press type cam mechanism characterized in that a workpiece 1 is discharged horizontally in another direction by a return claw 12.