JP2884827B2 - Cam type for press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention utilizes a cam having an inclined cam surface to apply a pressing force in one direction, such as downward, to a press machine in the other direction, such as a horizontal direction crossing the same. Alternatively, the present invention relates to a cam die for press that performs processing such as drilling, shearing, and bending.

[0002]

2. Description of the Related Art Conventionally, as a cam type for presses of this kind,
For example, as disclosed in Japanese Utility Model Publication No. 1-23638, the cam slide is reciprocated in the horizontal direction in accordance with the vertical operation of the cam driver disposed on the upper die, and pressed by a punch or the like attached to the cam slide. Processing is performed.

In these press cam dies, the front wall of the cam guide and a recess provided in the cam slide are used to return the cam slide to an initial position, that is, a retracted position by moving the cam driver upward. A return coil spring is disposed between the two ends.A pin having one end screwed to the front wall of the cam guide has a pin on one end of the coil spring disposed on the front wall of the cam guide. The cam guide is extended and inserted into the provided recess, and is held by this pin so that the position of the cam guide at one end of the coil spring with respect to the front wall during use is not changed.

[0004]

When the position of one end of the coil spring with respect to the front wall of the cam guide is held by the pins screwed to the cam guide as described above, the front wall of the cam guide is required. Disengagement of the pin to the press cam type disassembly and maintenance work, especially replacement work of the coil spring, and when assembling again, the pin must be screwed into the front wall of the cam guide. The workability is extremely poor.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a press cam mold excellent in disassembly and assemblability.

[0006]

According to the present invention, there is provided a cam guide, a cam slide movably disposed on the cam guide, having a cam surface inclined at one end, and a cam slide. A cam driver which has a cam surface at one end, which is in surface contact with the cam surface, moves the cam slide on the cam guide via the cam surface by movement, and in order to return the cam slide to the initial position on the cam guide, One end of the coil spring is disposed in the recess formed in the cam slide and provided between the cam guide and the cam slide. The other end of the coil spring has a predetermined position with respect to the cam guide. A spring position holding member provided integrally with a bulging portion surrounded by the other end and a spring receiving plate portion with which the other end of the coil spring abuts, and disposed on a wall surface of the cam guide facing the opening end of the recess; With And is, the spring position holding member, its is held in the cam guide at the site of the outer periphery of the spring receiving plate portion, the bulging portion, the other end of the coil spring the bulging front end side
It has a conical surface as the centering surface of
Before the ride was guided by the cam guide by the cam driver
The recess formed in the cam slide even in the advanced state
Is achieved by a press cam mold that is bulged with sufficient lowness to lie outside the

In one of the press cam dies according to the present invention, the spring position holding member is held by the cam guide by arranging a portion of the outer peripheral edge of the spring receiving plate portion in a groove formed in the cam guide. The present groove may be formed at any part of the cam guide. However, in one preferred example in which the cam guide includes a guide bar and a base to which the guide bar is attached, a groove is formed between the guide bar and the base. The spring position holding member is cam guide by placing the outer peripheral portion of the spring receiving plate portion in this groove so that the outer peripheral portion of the spring receiving plate portion is sandwiched between the guide bar and the base portion. May be held. In another one of the press cam molds of the present invention, opposing outer peripheral portions of the spring receiving plate portion are bent, and the front outer wall portion of the cam guide is gripped by the bent outer peripheral portions. In other words, the spring position holding member may be held by the cam guide by fitting the spring receiving plate to the front wall of the cam guide.

[0008] In one preferred embodiment, the bulging portion of the spring position holding member has an annular portion and a conical portion, and the surface of the conical portion has a centering surface for centering one end of the coil spring. Is formed. By forming a centering surface on the bulging part, even if the coil spring jumps during use and one end of the coil spring tries to displace from a normal position, it can be forcibly stopped, so that the coil spring is damaged and normal operation is performed. You can avoid situations that can't be done. The centering surface may be embodied by the conical surface of the above-mentioned conical portion. Is also good. The angle of inclination of this conical surface can be determined in view of the above-mentioned centering action and the ease of replacement of the coil spring, and in a preferred example, about 1
It is in the range of 0 to 25 degrees, and more preferably about 15 degrees.

[0009] In one of the above-mentioned press cam dies, the thickness W of the annular portion is such that R ≧ W ≧ 1 with respect to the wire diameter R of the coil spring.
/ 2R is preferable.

[0010]

In the press cam mold of the present invention, for example, a cam driver is fixed to an upper mold and a cam guide is fixed to a lower mold. In this state, when the cam surface of the cam driver is moved downward while the cam surface of the cam driver slides on the cam surface of the cam slide together with the operation of the ram of the press machine, the cam slide is pressed by the cam driver and the moving direction of the cam driver. Is moved against the spring force of the coil spring in a direction intersecting the direction of movement of the coil spring. With this movement, the workpiece is processed by a processing tool such as a punch attached to the cam slide. Thereafter, the cam driver is raised with the rise of the ram of the press machine, and at the same time, the cam slide is urged by the coil spring, and the cam slide is retracted and returned to the initial position. In the press cam mold of the present invention, the coil spring is compressed from the cam slide easily by compressing the coil spring to the thickness of the bulging portion of the spring position holding member in a state where the cam slide is returned to the initial position. It can be removed and thus easily disassembled. When assembling again, the reverse operation may be performed.

The present invention will be described below based on preferred embodiments shown in the drawings. This will clarify the invention described above and other inventions.

The present invention is not limited to these specific examples.

[0013]

1 to 4, a cam guide 1 comprises a base 2, a front wall 3 and a rear wall 4 erected at both ends of the base 2, and a front wall 3 and a rear wall respectively at both ends. Screws 5 and 6 in part 4
And a cylindrical guide bar 7 fixed by the The base 2 is provided with through holes 8 and 9.
The cam guide 1 is fixed to, for example, the lower die of the press by screws or the like inserted into the cam guide 1 and the screw 9.

A cam slide 10 movably disposed in the direction A on the base 2 of the cam guide 1 comprises a main body 11 and a main body 1.
1 comprises a lower plate 12 attached to the lower surface of the body 1 and a shock absorbing member 13 attached to the rear end of the body 11, and a guide bar 7 penetrates a through hole 14 formed in the body 11. A cam surface 15 that is inclined is formed at one end of 11. The lower surface 16 of the lower plate 12 is slidably abutted on the upper surface 17 of the base 2 in the direction A. Between the main body 11 and the guide bar 7 in the through hole 14, there is preferably formed copper on a back metal. Wound bush bearings 18 and 19 each formed by filling and covering a sintered alloy layer with a lubricating synthetic resin are provided fixed to the main body 11. With this configuration, the movement of the cam slide 10 in the direction A is guided by the guide bar 7, and its rotation about the guide bar 7 is prevented by the base 2. A dust seal ring 20 is fitted to the front end of the through hole 14, and the ring 20 prevents dust from entering the through hole 14.

The cam driver 21 has through holes 22 and 23
Body 2 having at one end a flange portion 24 having an opening formed thereon and a cam surface 25 in surface contact with the cam surface 15 of the cam slide 10.
6 and the cam driver 21 is B
Cam surfaces 25 and 15 that come into surface contact with each other by moving in the direction
The cam slide 10 is moved in the direction A on the base 2 of the cam guide 1 via. The lower part 27 of the main body 26 has a forked shape so as to straddle the guide bar 7. The cam driver 21 is fixed to, for example, an upper die of a press via screws inserted into the through holes 22 and 23.

The cam slide 10 is connected to the base 2 of the cam guide 1.
The coil spring 28 that returns to the upper initial position, that is, the left end in FIG. 1 in this example, has one end 29 disposed on the bottom surface of the recess 30 provided in the main body 11 of the cam slide 10, And is provided between them.
The spring position holding member 32 that holds a predetermined position of the other end 31 of the coil spring 28 with respect to the front wall portion 3 of the cam guide 1 is formed by sheet metal working.
A bulged portion 33 enclosed by and surrounded by 1 and a spring receiving plate portion 34 with which the other end 31 of the coil spring 28 abuts are integrally provided . The spring position holding member 32 includes the guide bar 7 and the front wall 3.
A portion of the upper edge 36 which is one of the outer peripheral edges of the spring receiving plate portion 34 is disposed in the groove 35 formed between the guide bar 7 and the front wall portion 3. Pinched, held,
Thus, the cam guide 1 facing the open end 37 of the recess 30
Are detachably disposed on the wall surface 38 of the front wall portion 3 of FIG. Further, in this example, opposing side edges 39 and 40 which are the other outer peripheral edges of the spring receiving plate portion 34 are bent, and both side edges 39 and 40 are formed in the longitudinal grooves formed on both side surfaces of the front wall portion 3. 41 and 4
2 is arranged so as to grip the front wall 3. In other words, in addition to the above, the spring position holding member 32 of the present embodiment further includes two side edges 39 and 4 on the front wall portion 3 of the cam guide 1.
0 and is held by the cam guide 1.

As shown in detail in FIGS. 3 and 4, the bulging portion 33 comprises an annular portion 43 and a truncated conical portion 44 integrally formed on an end face of the annular portion 43. The conical surface 45 of the frustoconical portion 44 is designed to return to the original position even if the other end 31 rides on the conical surface 45 when the position of the other end 31 of the coil spring 28 changes, in other words, the other end 31. Acts to align. Further, the other end 31 can be easily formed into the annular portion 43.
In this example, the annular portion 43 is formed such that the thickness W thereof is substantially equal to the wire diameter R of the coil spring 28 so as not to get on. The inclination angle 46 of the conical surface 45 is about 15 degrees in this example. As described above, the bulging portion 33 has a bulging tip.
A conical surface as the centering surface of the other end 31 of the coil spring 28 on the side
45, and also the bulge 33 is shown in FIG.
As shown in FIG.
In the state of being further advanced by being guided by the cam guide 1
Also located outside the recess 30 formed in the cam slide 10.
So that it swells out with sufficient lowness.

In this embodiment, as is apparent from FIG. 2, the cam guide 1, the cam slide 10, and the cam driver 21 are formed so that their lateral widths are all the same.

The cam 50 for a press constructed as described above.
In this case, a working tool such as a punch 52 is attached to the front surface 51 of the main body 11 of the cam slide 10 for use.
In the initial position, the cam driver 2 fixed to the upper mold
1, the cam slide 10 is located to the left of the base 2 of the cam guide 1 fixed to the lower die in FIG. 1, and the cam driver 21 is lowered with the operation of the ram of the press machine. And the cam surface 25 of the cam driver 21
Is lowered while slidingly contacting the cam surface 15 of the cam slide 10. As the cam driver 21 descends, the cam slide 10 is pressed against the cam surface 15 by the cam surface 25 of the cam driver 21 and is moved forward in the direction A, that is, while pressing the coil spring 28 to the right in FIG. During this movement, the inner surfaces of the bush bearings 18 and 19 come into sliding contact with the surface of the guide bar 7, so that the cam slide 10 is guided and moved by the guide bar 7. The punch 5 is moved by the forward operation of the cam slide 10.
At 2, the workpiece is processed. Thereafter, when the cam driver 21 is moved upward together with the operation of the ram of the press machine, the cam slide 10 is moved by the impact buffering member 13 attached to the rear surface of the main body 11 by the elastic force of the coil spring 28. The cam driver 21 is moved until it comes into contact with No. 4 and returned to the initial position. The retraction stop of the cam slide 10 is caused by the shock absorbing member 13.
This is performed by contact with the rear wall portion 4, so that the impact at the time of stoppage is reduced.

In the pressing cam mold 50 of the present embodiment, the bulging portion 33 of the spring position holding member 32 is formed by the annular portion 43 having the truncated conical portion 44. After the cam slide 10 is brought to the initial position, only the coil spring 28 is compressed to the thickness W or more of the annular portion 43 without removing the spring position holding member 32, and only the coil spring 28 is taken out from the side. Therefore, replacement of the coil spring 28 can be easily performed. Further, in the press cam mold 50, the spring receiving plate portion 34 is sandwiched between the guide bar 7 and the front wall portion 3 by the upper edge 36, and the front wall portion 3 is gripped via both side edges 39 and 40. Therefore, the spring position holding member 32 is firmly maintained at the predetermined position, and the position of the other end 31 of the coil spring 28 can be held at a predetermined position without any change in the position of the bulging portion 33.

In the above example, both side edges 3 of the spring receiving plate portion 34 are used.
Although the spring position holding member 32 having the bent portions 9 and 40 is used, the present invention is not limited to this. For example, the spring position holding member 61 whose both side edges 39 and 40 are not bent as shown in FIG. Such a spring position holding member 61 may be held on the front wall 3 of the cam guide 1 via only the upper edge 36. Therefore, the same effect as described above can be obtained even if a cam for press is constituted by such a spring position holding member 61. When the spring position holding member 32 or 61 is used, the spring receiving plate 3
A groove for receiving the lower edge 62 of the base 4 is provided on the upper surface 17 of the base 2;
The lower edge 62 may be fitted into this groove to more reliably hold the spring position holding member 32 or 61 on the front wall 3 of the cam guide 1.

[0022]

As described above, in the press cam type of the present invention, the spring position holding member for holding the contact position of the other end of the coil spring with the cam guide is expanded by the other end of the coil spring. Since the coil spring is formed by the parts, the coil spring can be easily removed and mounted in maintenance disassembly and assembly such as replacement of the coil spring, and the workability is extremely excellent. In addition, since the spring position holding member is held by the cam guide at the entire outer peripheral edge of the spring receiving plate portion or at any position, the spring position holding member can be prevented from being displaced. The position holding member can hold the position of the other end of the coil spring as desired. That is, for the press of the present invention
According to the cam type, the spring position holding member has a spring receiving plate portion.
Because it is held by the cam guide at the outer peripheral edge,
It is possible to avoid situations such as displacement of the position holding member.
Therefore, the spring position holding member without position fluctuation
The position of the other end of the coil spring can be held as desired, and
Is a cone as the centering surface at the other end of the coil spring
Surface, and the cam slide is
Even when the cam guide is advanced by being guided by the cam guide,
Expansion so that it is located outside the recess formed in the
Because the protrusion is swelled with a sufficient height, the spring
Installation and removal of position holding member and coil spring are extremely
It is easy to replace the spring position holding member and coil spring.
For easy maintenance and disassembly and assembly, take out the coil spring easily.
It can be removed and attached, it can be made extremely workable,
In addition, the bulging portion is aligned with the other end of the coil spring on the bulging tip side.
Since it has a conical surface as a surface,
When the end jumps up and comes off the bulge, the other end
Even if you get on the bulge, it returns to its original position due to the conical surface.
As a result, the bulge is bulged with a sufficiently low
Even if the other end of the coil spring is
And the other end of the coil spring comes off the bulge
Avoid accidents such as the coil spring being crushed by riding.
Can comb.

[Brief description of the drawings]

FIG. 1 is a side sectional view of one preferred embodiment of the present invention.

FIG. 2 is a front view of the specific example shown in FIG.

FIG. 3 is a partially enlarged explanatory view of the specific example shown in FIG. 1;

FIG. 4 is a partially exploded perspective view of the specific example shown in FIG.

FIG. 5 is a perspective view of another example of the spring position holding member according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 cam guide 10 cam slide 15 cam surface 21 cam driver 25 cam surface 28 coil spring 32 spring position holding member

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B21D 37/08

Claims (2)

(57) [Claims] 1. A cam guide, a cam slide movably disposed on the cam guide and having a cam surface inclined at one end, and a cam surface at one end contacting the cam surface of the cam slide. A cam driver for moving the cam slide on the cam guide via the cam surface by movement, and one end disposed in a recess formed in the cam slide for returning the cam slide to an initial position on the cam guide. A coil spring provided between the cam guide and the cam slide, and a bulged portion surrounded by the other end of the coil spring and a coil spring to maintain a predetermined position of the other end of the coil spring with respect to the cam guide. A spring position holding member disposed integrally on a wall surface of the cam guide facing the opening end of the recess, the spring position holding member integrally having a spring receiving plate portion with which the other end abuts, Then The bulging portion is held by the cam guide at the outer peripheral portion of the spring receiving portion, and the bulging portion is
It has a conical surface as the centering surface at the other end of the spring.
And the cam slide is adjusted to the cam guide by the cam driver.
Formed on a cam slide even when it is moved forward
Low enough so that it lies outside the recess
A press cam type that is bulging . 2. The press cam die according to claim 1, wherein the spring position holding member is held by the cam guide by arranging an outer peripheral portion of the spring receiving plate portion in a groove formed in the cam guide. .