JPH10314863A - Cam structure of press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute piercing, etc., on an inclining face nearby the central part of a large pressed goods without using a large working cam, and further at the same time with a bending or blanking process of the work. SOLUTION: A cam base 10 having a vertical sliding face and a lateral sliding face is hung to an upper die 100 of a press die, and on this cam base 10, a cam driver 20 to slide up and down and a working cam 30 to slide in the lateral direction are installed freely slidably. Then, while the work W is held with the cam driver 20 and a lower die 200 following to lowering of an upper die 100, by moving the working cam 30 to the inclining face direction with the upward movement of the cam driver 20 and the lowering movement of the upper die 100, a piercing punch 70 is advanced toward the work W and working of piercing, etc., is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a process for forming a hole in the same process as a large-sized die such as a bending die or a punching die when a process such as punching is required on an inclined surface near the center of a large pressed product. The present invention relates to a press-type cam structure in which a small-sized processing cam can be adopted so that drilling or the like can be performed.

[0002]

2. Description of the Related Art Conventionally, when drilling, bending, punching, etc. are performed in a direction inclined with respect to a pressing direction,
It is common to incorporate a cam into a press die. This cam structure generally has a press-type lower mold 2 as shown in FIG.
00 and the upper die 100
And the driving surface 321 of the cam driver 320
And a working cam 330 that slides in the working direction K with the upper sliding surface 121 of the upper die 100.

By the way, a work W which is a pressed part is a large part such as a panel of an automobile body, for example.
Conventionally, when a processing portion such as a hole is located near the center of the work W, a large processing cam 3 as shown in FIG.
I had to adopt 30. That is, the conventional cam driver 320 is fixed to a key portion of the lower die 200 further outside the cutout w90 on the outer periphery of the work W provided on the lower die 200. The cam driver 320 is fixed to the outside of the cutout w90 because the work W is on the lower die 200 even if the cutout w90 on the outer periphery of the work W is cut. This is because it can be installed only outside the line w90.

The cam driver 320 includes a work W
Of the front end of the machining cam 330 near the center of the
A drive surface 321 that is substantially perpendicular to the mounting portion 333 and that is parallel to the drilling direction K is formed. On the other hand, the upper mold 10
At the key point 0, there is a driven surface 331 slidingly contacting the driving surface 321 of the cam driver 320 at the rear, and a processing tool 70 for performing a boring process is attached to the front mounting portion 333. A processing cam 330 that slides along the sliding surface 121 is provided.

[0005]

The conventional machining cam 3
As is clear from FIG. 6, since the distance between the attachment portion 333 of the processing tool 70 and the driven surface 331 is large, the size of the 30 is inevitably large, and the manufacturing cost of the processing cam 330 is expensive. In addition, there is a problem that a dedicated process including the processing cam is required.

[0006] Further, the outer peripheral portion w90, which has the most processing such as bending and punching of the work W, is blinded by the processing cam 330 and cannot be processed in the same pressing step. There is a problem that a press die for processing is separately required, which increases the cost and the number of steps of the press die. The present invention has been made to solve the above problems.

[0007]

According to a first aspect of the present invention, there is provided a press-type die having a vertical sliding surface parallel to the pressing direction and substantially perpendicular to the pressing direction. A cam base having a horizontal sliding surface and a contact surface that is suspended from the cam base, slides up and down along a vertical sliding surface of the cam base by a rear sliding surface, and abuts against a work on a lower surface. A cam driver having an inclined surface at the front, and a lateral sliding surface of the cam base by an upper sliding surface,
A press-type cam structure comprising a processing cam having a processing tool that slides in a lateral direction with an upper die pressing operation on an inclined surface that is in sliding contact with the guide surface of the cam driver and that is parallel to the inclined surface. .

According to the first aspect of the invention, when the upper die is lowered, the lower surface of the cam driver first contacts the upper surface of the work placed on the lower die, and the cam driver vertically slides the cam base suspended from the upper die. It moves relatively upward along the moving surface.
With the relative upward movement of the cam driver, the processing cam moves forward, and in conjunction with the lowering of the upper die, the processing tool is advanced in the processing direction of the workpiece to perform processing such as drilling. Therefore, since the cam driver is installed near the processing part, it is possible to drill the center part in one press die without crossing the processing line of the upper die for processing such as punching the outer periphery of the work. Will be possible.

[0009] Further, a second aspect of the present invention for solving the above-mentioned problems.
In the press type cam structure according to claim 1, the holding member sandwiches a guide surface of the cam driver and an inclined surface provided on the processing cam on at least one side surface of the cam driver and the processing cam. A press-type cam structure characterized in that they are slidably held with each other. According to the second aspect, the cam driver can be reliably held slidably on the cam base and the processing cam.

[0010] Further, a third aspect of the present invention is to solve the above problem.
In the press type cam structure according to claim 2, the holding member has one end fixed to one of the cam driver and the processing cam, and the other end fixed to one of the cam driver and the processing cam. A press-type cam structure characterized by being slidably engaged with a concave groove formed on the other side surface in parallel with the inclined surface. According to the third aspect, the cam driver and the processing cam can be held by a simple holding member, so that the press die can be manufactured at low cost.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a cam structure 1 of the present invention, and shows a state in which an upper press die 100 is at a top dead center. The upper mold 100 has a punching blade 101 on the outer periphery, and a pad 110 for holding the work is suspended from the inner periphery thereof together with the lower mold so as to be slidable up and down. The cam structure 1, which is a main part of the present invention, is provided in the notch 111 of the pad 110 with the upper die 1.
00 and is stored. This cam structure 1
It comprises a cam base 10, a cam driver 20, and a processing cam 30.

The cam base 10 is fixed to the recess 103 of the upper mold 100 on the upper surface of the bottom 11 having a substantially inverted L-shaped cross section. The vertical part 1 which goes down continuously from this bottom part 11
2 is a vertical sliding surface 1 for guiding the cam driver 20
3 are provided. At the lower end of the vertical portion 12, a stopper 14 for preventing the cam driver 20 from dropping is provided.

A cam driver 20 which slides up and down in sliding contact with a vertical sliding surface 13 of the cam base 10 is suspended. This cam driver 20 has a substantially pentagonal shape,
A vertical sliding surface 21 in the vertical direction that slides on the vertical sliding surface 13 of the cam base 10, a lower surface 22 for holding the work W between the lower mold 200, and a surface 23 parallel to the boring surface w 91 of the work W. And a guide surface 24 on which the processing cam 30 slides at a substantially right angle to the surface 23, and an upper surface 25 pressed downward by the spring 18 between the cam base 10 and the upper portion.

Next, the working cam 30 is constantly pressed in the direction of the cam driver 20 (leftward in the figure, hereinafter referred to as "rearward"), and a sliding surface 15 provided on the cam base 10 at the upper part.
A sliding surface 31 that slides laterally along the cam base 1
0, a rear surface portion 32 in contact with a key point, an inclined surface 34 in sliding contact with the guide surface 24 of the cam driver 20, and an inclined surface 3
A processing surface 33 on which a drilling tool 70 is erected at right angles to 4;
Vertical surface 3 pressed from cam base 10 via spring 19
5 and a substantially pentagonal shape.

The detailed structure of the vertical portion 12 of the cam base 10 and the vertical sliding surface 21 of the cam driver 20, and the sliding surface 15 of the cam base 10 and the sliding surface 31 of the processing cam 30 are shown in FIG. The sliding surface 15 of the working cam 30 and the sliding surface 31 of the processing cam 30 will be described as a representative in a vertical sectional view. That is, the sliding surface 15 of the cam base 10 has a U-shaped cross section opened downward, and the stopper member 1 is formed so as to partially close the opening.
7, 17 are provided. The sliding surface 31 of the processing cam 30 is the sliding surface 15 of the U-shaped cross section of the cam base 10.
And is held by the stopper member 17 so as not to drop.

Also, as shown in FIG.
One end is fixed to the side wall surface 39 of the machining cam 30, and the other end is fitted into the groove 28 provided in the side wall surface 29 of the cam driver 20, and slides between the side wall surface 29 of the cam driver 30 and the side wall surface 39 of the processing cam 30. A forced return follower 40 having a U-shaped cross section that moves is provided.

On the other hand, the lower die 200 has an outer periphery w90 of the work W.
And a top surface 211 on which the workpiece W is placed. A die 220 for drilling a drilled portion w91 of the work W at an angle of approximately 45 degrees with respect to the pressing direction is provided at a substantially central portion of the upper surface 211. At the lower part of the die 220, a hole 212 and a chute 290 for penetrating the lower die 200 and dropping the scrap after punching are provided.

The operation of the present invention configured as described above will be described. First, when the upper mold 100 is at the top dead center as shown in FIG. 1, the cam base 10 is also suspended above the upper mold 100, and the cam driver 20 is attached to the cam base 10 by its own weight and the spring 18. Due to the downward pressing force, it comes into contact with a stopper 14 provided at the lower end of the cam base 10 and is at the lowermost end.

The processing cam 30 is provided with a cam driver 2.
0 is located at the lowermost end and is located at the rearmost position in the figure due to the pressing force of the spring 19. As the upper mold 100 gradually descends, the pad 110 for holding the work W hits the upper surface of the work W, and the work W is held between the pad 110 and the lower mold 200. At this time, the lower surface 22 of the cam driver 20 is also
Abuts on the work W and holds the work W. (State of FIG. 2)

When the upper mold 100 further descends, as shown in FIG.
At the same time as the workpiece W is pulled out by the contact of the punching blade 101, the cam base 10 also moves down, so that the cam driver 20 moves up relatively. The rising of the cam driver 20 causes the working cam 30 to move forward (to the right in the drawing) against the pressing force of the spring 19. Due to the synergistic movement of the forward movement and the downward movement of the processing cam 30, the punch 70 provided at the tip of the processing cam 30 causes the drilling processing surface w of the workpiece W to move.
The workpiece W proceeds to 91, and the workpiece W is drilled. When these outer punching and drilling are completed, the upper mold 10
0 is returned to the state shown in FIG. 1, and the one-cycle pressing process is completed.

[0021]

According to the cam structure of the present invention configured as described above, the following effects can be obtained. That is, since the cam driver and the processing cam are suspended from the upper die near the processing part of the work via the cam base, it does not cross the outer punching line on the outer periphery of the work. Can be installed integrally, the press die can be simplified, and the pressing process can be shortened.

Further, since the lower surface of the cam driver performs the drilling while holding the work near the processing portion together with the lower mold, the drilling can be performed accurately without the work being displaced.

Further, since the cam driver and the processing cam are slidably provided on the cam base, even if the drilling processing position is changed due to a change in the design of the work, the change can be easily dealt with.

In this embodiment, an example in which a hole is formed near the center of the work has been described. However, the present invention can also be applied to bending and the like near the center of the work.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a cam structure of the present invention in which an upper die is located at a top dead center.

FIG. 2 is a longitudinal sectional view of the cam structure of the present invention showing a state in which an upper die is lowered and a lower surface of a cam driver is in contact with an upper surface of a work.

FIG. 3 is a vertical sectional view of the cam structure of the present invention showing a state immediately before the upper die is lowered, the outer periphery of the work is punched out, and at the same time, the end of the punch is brought into contact with the work and drilling is performed. Figure

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along the line VV in FIG. 2;

FIG. 6 is a longitudinal sectional view of a conventional cam structure corresponding to FIG.

[Explanation of symbols]

 Reference Signs List 1 cam structure 100 upper die 10 cam base 110 pad 20 cam driver 200 lower die 30 processing cam W work 40 forced return follower

Claims (3)

[Claims] A cam base having a vertical sliding surface parallel to the pressing direction and a horizontal sliding surface substantially perpendicular to the pressing direction; a cam base suspended from the cam base; A cam driver that slides up and down along the vertical sliding surface of the cam base by the sliding surface, has a contact surface on the lower surface that contacts the work, and has a guide surface on the front, and a sliding surface on the upper part. A laterally sliding surface of the cam base, and a processing cam having a processing tool having a processing tool parallel to the inclined surface, which slides laterally with an upper die pressing operation on an inclined surface that slides on a guide surface of the cam driver. Press-type cam structure consisting of 2. The press-type cam structure according to claim 1, wherein at least one side surface of the cam driver and the processing cam has a holding member sandwiching a guide surface of the cam driver and an inclined surface provided on the processing cam. A press-type cam structure which is slidably held. 3. The press-type cam structure according to claim 2, wherein one end of the holding member is fixed to one of the cam driver and the processing cam, and the other end is one of the cam driver and the processing cam. A press type cam structure characterized in that the other side surface is slidably engaged with a concave groove formed parallel to the inclined surface.