JP2847978B2 - Top hanging cam structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an upper hanging cam in a press die.

[0002]

2. Description of the Related Art In a punching process using a press, if the angle of a cutting edge portion of a lower die becomes an acute angle of, for example, 70 degrees or less, the strength of the cutting edge decreases, which is not preferable. If there is a possibility of becoming
The process is performed in two steps: unfolding and cushion bending.

That is, as shown in FIG. 4, the work W is clamped between the press pad 1 and the lower mold 2 so that the cut portion of the work W is almost horizontal, and the upper mold 3 is cut with respect to the work W. After performing an unfolding process in which the blade 3a abuts at a substantially right angle and cuts the work W, the work W is re-clamped between the press pad 4 and the lower mold 5 of another molding die, and the periphery of the work W cut in the previous process is removed. A desired work shape was obtained by performing a cushion bending step of correcting the portion to a predetermined angle.

[0004] There is also a method of performing processing using a shift cam mechanism.

[0005] For example, FIG. 5 shows a step of extracting a luggage inner panel W of an automobile body by a press die having a shift cam mechanism. The luggage inner panel W formed into a predetermined shape by the previous step is a lower die. The slide plate 9b of the upper suspension cam 9 suspended on the upper die 8 is mounted on the lower die 6 when the ram is lowered. By slidingly contacting the cam surface 10a, the upper suspension cam 9 is driven forward in a direction approaching the luggage inner panel W, and performs punching from the outside to the inside of the vehicle.

A guide rail 11 serving as a forced return cam is provided on the side surface of the upper suspension cam 9.
b, and the guide rail 11
Is engaged with one side of a guide member 12 provided on the side surface of the fixed cam 10 and having a U-shaped cross section (see FIG. 6).

When the upper suspension cam is pushed away from the luggage inner panel W by the elastic force of the return spring 13 when the ram is raised, the upper suspension cam is forcibly guided so as to retreat along the guide rail 11. And the hanging cam 9
Of the lower die 6 does not interfere with the lower die 6.

[0008]

However, in the above-described conventional suspension cam 9 of the approaching cam type, since the punching process is performed from the outside of the vehicle to the inside, the burr is restricted from the inside to the outside of the vehicle. When performing the punching process, the panel W is mounted upside down, and the cutting edge of the lower die 6 becomes an acute angle in the pressing direction. Therefore, as described above, the strength of the cutting blade is unfavorably reduced, and therefore, as shown in FIG. 4, it is necessary to perform the punching process in two steps, ie, unfolding punching and cushion bending.

Further, Japanese Utility Model Laid-Open Publication No. 63-24982 discloses another structure of the upper suspension cam. This is because the cam driver is suspended by using a hanger on the upper suspension cam, and the cam driver is also integrally lifted with the upper die when the ram is raised. The concave block is engaged with the mating block to fix it, and the upper hanging cam can be driven.By raising the cam driver when the ram is raised, there is no upward protrusion from the lower mold, and large products are carried in. So that it can be processed.

However, the structure of the upper hanging cam has a problem that clearance cannot be controlled because there is no receiving portion for reaction force at the time of punching.

The present invention has been made in view of the above circumstances, and works on a cutting blade from a work when the work is cut.
Control the fluctuation of clearance due to reaction force
It is an object of the present invention to provide an upper suspension cam structure that can be used.

[0012]

As the present invention means to solve the above object, according to an aspect of, Wah click is placed, and,
A lower mold having a first cutting edge, and a straight line with respect to the lower mold.
Upper die arranged to be relatively movable in the direction of approaching / separating
And an upper cam suspended from the upper die,
A second cutting blade attached to the lower cam,
Provided on the upper driving cam surface and the upper suspension cam,
The driving cam when the upper die and the lower die move relative to each other.
By moving along the surface, the upper suspension cam
Operated in a direction different from the relative movement direction, the first
Biting the cutting blade and the second cutting blade into both surfaces of the work
The workpiece is cut from its edge to its edge.
The driven cam surface and the driven cam
When the first cutting blade and the second cutting edge are in contact with each other,
Between the cutting blade and the cutting direction of the work
In on suspended cam structure direction of clearance is set, before SL drive cam surface, the at the time of cutting of the workpiece second
When the reaction force acting on the cutting blade is transmitted to the upper suspension cam,
In this case, the reaction force causes the upper suspension cam to operate and the drive
The moving cam surface and the driven cam surface are arranged so as to be separated from each other.
The upper suspension cam or the lower die
On the other hand, when the reaction force is transmitted to the upper suspension cam
A guide member to maintain the the previous SL drive cam surface the slave moving cam surface in contact is characterized by being kicked set.

[0013]

[Function] When the upper and lower dies are brought close to each other,
The contact between the moving cam surface and the clearance between the two cutting blades
Is set, and the relative movement direction between the upper mold and the lower mold is
The upper suspension cam operates in different directions. And two cuts
The blade bites into both sides of the work, from edge to edge of the work
A cutting line is formed over the workpiece and the workpiece is cut. Toes
Machining is performed in which both ends of the cutting line reach the edge of the workpiece.
Nawa is, so-called open cutting line Ru is formed.

[0014] For this reason, in the cutting process of the work, word
From the workpiece to the second cutting edge,
A reaction force in the crossing direction acts. And this reaction force is suspended
Is transmitted to the drive cam surface and separates the drive cam surface and the driven cam surface.
It is the power to try. However, due to the guide member
Because the reaction force is received, the driving cam surface and the driven cam surface
Are kept in contact. Therefore, cutting of the workpiece
In the process, a setting is made between the first cutting edge and the second cutting edge.
Fluctuations in the clearance are suppressed , and high-precision machining is performed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the upper suspension cam structure of the present invention is applied to a press-type upper suspension processing cam for punching a luggage inner panel of an automobile body will be described below with reference to FIGS. I do.

FIGS. 1 and 2 show a first embodiment, in which a press die for punching a panel is an upper die 2.
1 and a lower mold 22 . This upper die 21 moves in the direction of arrow B.
By descending and ascending, the upper mold 21 and the lower mold 22 are directly
It is configured to linearly approach / separate. On the lower surface of the upper die 21, a processing cam 23 as an upper suspension cam is suspended so as to be slidable in the horizontal direction, and is always urged in a return direction (left direction in FIG. 1) by a return spring 24.

A cutting blade 22a is provided on the upper part of the lower mold 22, and a luggage inner panel W formed in a predetermined shape excluding a marginal pressing margin portion by the previous process is provided on the upper surface thereof. The product portion is placed upside down, and the product portion is held by the product holding pad 25 when the upper die 21 descends.

Further, on the peripheral edge of the lower mold 22 and the cam driver 26 is provided a fixed cam, to the outside of the upper portion of the cam driver 26 (right side in FIG. 1) is plate-shaped
Fixed cam 26b is attached by bolt 26c
I have. Flat drive movement cam surface 26a in the fixed cam 26b
Are formed.

At the lower end of the machining cam 23 , a bob
The plate-shaped slide plate 23b is removed by the
Is attached. In this slide plate 23b,
A driven cam parallel to the driving cam surface 26a of the cam driver 26
The surface 23c is formed. Cutting edge 23a at the bottom of the side closest to the luggage inner panel W in or machining cam 23
The driving cam surface 26a of the cam driver 26 is moved downward so that the cutting blade 23a slides in a direction in which the cutting edge 23a comes into contact with the cut portion of the luggage inner panel W substantially at right angles. Ascending direction (arrow B direction)
And the inclination with respect to are set. That is,
Occurs when cutting the luggage inner panel (work) W
The reaction force S is transmitted to the processing cam 23 via the cutting blade 23a.
In this case, the processing cam 23 operates by the
Force in the direction in which the moving cam surface 26a and the driven cam surface 23c separate.
It is arranged to become.

The upper part of the cam driver 26 has a section L
A guide member 27 having a V-shape is attached by a bolt 28 in a direction orthogonal to the drive cam surface.
Thereby, escape of the processing cam 23 in the direction away from the driving cam surface 26a (the direction of arrow S in FIG. 1) when cutting the luggage inner panel W is restricted (see FIG. 2).

The driving cam surface 26a and the driven cam surface 23
c and the cutting blade 22a and the cutting blade 23a
In the cutting direction of the luggage inner panel W
The clearance in the intersecting direction is set. The clearance is set in accordance with the thickness of the workpiece W to be punched. When the clearance is properly set, the driven cam surface 23 of the slide plate 23b of the processing cam 23 is set.
c is such that close contact with the drive cam surface 26a of the cam driver 26, the Rukoto be replaced with a slide plate 23b suitable thickness, allowed to adjust the clearance
Noh. In addition, the guide member 27 is
When mounting, a shim plate is sandwiched or the drive cam surface 26a
The bolt 28 is attached in a direction orthogonal to remembering function of adjusting the amount of protrusion of the guide member 27, at the time of punching, the driven cam face 23c is driven cam surfaces of the slide plate 23b
As sliding contact without leaving 26a or al, Rukoto to ensure proper clearance is possible. In addition, a guide
The member 27 connects the luggage inner panel W to the cutting blade 22a and the cutting edge 22a.
In the process of cutting with the cutting blade 23a, the cutting blade 23
When the reaction force S acting on a is transmitted to the machining cam 23
And receives the reaction force S and slides with the fixed cam 26b.
It also has a function to suppress separation from the plate 23b.
There Ete.

Next, the operation of this embodiment configured as described above will be described.

After adjusting the clearance amount to match the thickness of the luggage inner panel W for punching, the lower die 2
The luggage inner panel W is placed at a predetermined position on the second.

Next, with the lowering of the ram, first, the product holding pad 25 is lowered to clamp the luggage inner panel W between the lower die 22 and the lower die 22. When the ram descends further, the upper mold 21
Plate 23 of machining cam 23 suspended on the lower surface of
b abuts against the drive cam surface 26a of the cam driver 26,
While being guided and lowered by the driving cam surface 26a, the driving cam surface 26a is driven forward in a direction away from the workpiece W against the elastic force of the return spring 24, that is, in the direction of arrow A in FIG.

Then, the processing cam 23 is lowered by a predetermined amount,
When the cutting blade 23a approaches the luggage inner panel W to be cut from a substantially right angle direction, the slide plate 23b
Is engaged with the inside of the L-shaped end of the guide member 27, and the driven cam surface is guided so as to slidably contact the drive cam surface 26a, and the separation from the drive cam surface 26a is regulated. As a result, the clearance between the cutting edge 22a of the lower die 22 and the cutting edge 23a of the machining cam 23 is properly maintained.

When the machining cam 23 further descends in this state, the two cutting blades 22a and 23a
Luggage inner panel
Is cut lines formed from the edge of the Le W over the edge, unnecessary periphery of luggage inner panel W such as pressing margin is disconnected by cutting edges 23a and punching is completed. Toes
And both ends of the cutting line are at the edges of the luggage inner panel W
All forms of processing are performed, so-called open cutting lines
Is formed. For this reason, the luggage inner panel W
In the cutting process, the cutting edge from the luggage inner panel W
23a in a direction substantially orthogonal to the cutting direction.
The reaction force S acts. Then, this reaction force S is
To the fixed cam 26b and the slide press.
Port 23b in a direction substantially perpendicular to the drive cam surface 26a.
In the direction of separation. However, the guide member 27
The reaction force is received by the driving cam surface 26.
a is kept in contact with the driven cam surface 23c. did
In the process of cutting the luggage inner panel W
And a clamp set between the cutting blade 22a and the cutting blade 23a.
Since the fluctuation of the clearance is prevented, high precision blanking can be achieved.

When the ram reaches the bottom dead center and starts to rise, the machining cam 23 is allowed to move in the return direction with the rise of the upper die 21, and the machining cam 23 is moved by the elastic force of the return spring 24. Return to expected position. At this time, the cutting blade 23a and the slide plate 23b are provided on the same side of the processing cam 23, and the cutting blade 23a of the processing cam 23 is formed by punching out of the luggage inner panel W. Because it does not cross the cutting blade 22a in the vertical direction,
Even if the timing of the movement of the processing cam 23 in the return direction is delayed, the processing cam 23 and the lower mold 22 do not interfere with each other,
There is no danger of damaging the cutting blades 22a, 23a.

FIG. 3 shows a second embodiment. In the first embodiment, the driving cam surface 2 of the cam driver 26 is used.
Instead of the guide member 27 for maintaining the contact state between the driven cam surface 6a and the driven cam surface of the slide plate 23b of the processing cam 23, the guide pin 31 is erected on the cam driver 26 so as to be parallel to the drive cam surface 26a. Processing cam 2
A guide hole 32 into which the guide pin 31 fits is formed on the lower surface of the guide pin 3.
1 is provided with a guide bush 32a which fits tightly. The same operation and effect as in the first embodiment can be obtained, and the guide pin 31 is connected to the guide bush 32a.
There is an advantage that it is easy to secure high clearance accuracy because it is fitted with no gap and slides in contact with the peripheral surface.

[0029]

As described above, the upper suspension cam structure of the present invention, when the upper mold and the lower mold are brought close to each other, makes the drive cam surface
Clearance between the two cutting edges due to contact with the driven cam surface
Is set, and the relative movement direction between the upper mold and the lower mold is
The upper hanging cam operates in different directions. And two
The cutting edge cuts into both sides of the work, and from the edge of the work to the edge
A cutting line is formed over and the workpiece is cut. Toes
Machining is performed in which both ends of the cutting line reach the edge of the workpiece.
That is, a so-called open cutting line is formed. this
Therefore, in the process of cutting the workpiece,
Reaction force on the blade in a direction almost perpendicular to the cutting direction
Works. And this reaction force is transmitted to the upper suspension cam.
And lift the lifting cam in the direction in which the driving cam surface and the driven cam surface separate.
Power to operate the system. However, due to the guide member
Because the reaction force is received, the driving cam surface and the driven cam surface
Are kept in contact. Therefore, cutting of the workpiece
In the process, a setting is made between the first cutting edge and the second cutting edge.
The fluctuation of the clearance is suppressed, and the workpiece is cut.
Accuracy can be improved .

[Brief description of the drawings]

FIG. 1 is a sectional side view showing an upper suspension cam structure according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional side view showing an upper suspension cam structure of a second embodiment.

FIG. 4 is an explanatory view showing conventional punching performed in two steps.

FIG. 5 is a sectional side view showing a conventional hanging cam structure.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

[Explanation of symbols]

 Reference Signs List 21 Upper die 22 Lower die 22a Cutting blade 23 Working cam 23a Cutting blade 23b Slide plate 24 Return spring 25 Product holding pad 26 Cam driver 26a Drive cam surface 27 Guide member 28 Adjusting bolt 31 Guide pin 32 Guide hole 32a Guide bush W Luggage inner panel

Claims (1)

(57) [Claims] 1. A word click is mounted, and a first cutting edge
The lower mold that has, and approaches and separates linearly from this lower mold
The upper die that is arranged to be relatively movable in the direction
Suspended upper suspension cam and attached to this upper suspension cam
A second cutting blade, and a driving cam provided on the lower die.
Surface and the upper suspension cam, and the upper die and the front
When it moves relative to the lower die, it moves along the drive cam surface.
By doing so, the upper suspension cam is
Operating in different directions, the first cutting edge and the second
The cutting edge of 2 is cut into both sides of the work
And a driven cam surface for cutting from the edge to the edge.
The driving cam surface and the driven cam surface come into contact with each other.
Thereby, between the first cutting edge and the second cutting edge,
Clear run in a direction substantially perpendicular to the cutting direction of the workpiece
In on suspended cam structure scan is set, before SL drive cam surface, said second switching during cutting of the workpiece
When the reaction force acting on the blade is transmitted to the upper suspension cam
The reaction force causes the upper suspension cam to operate and the drive
The cam surface and the driven cam surface are arranged apart from each other.
And either the upper suspension cam or the lower die
On the other hand, when the reaction force is transmitted to the upper suspension cam
To, on the suspended cam structure, wherein a guide member to maintain the the previous SL drive cam surface the slave moving cam surface in contact is eclipsed set.