JPH0318010Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a press die for inclined hole punching used for punching a hole in a direction oblique to the movement direction of a slide ram of a press machine.

(Prior Art) Conventionally, this type of press mold, as shown in FIGS. 6 and 7, abuts a slide cam 51 to which a punch 50 is integrally attached to a cam surface 54 of a pad 52 or a drive cam 53. and its cam surface 54
The slide cam 51 is moved in accordance with the reciprocating motion of the upper mold with reference to , and an inclined hole is punched at a predetermined position on the inclined surface.

Another conventional example is disclosed in Japanese Patent Laid-Open No. 58-212820.

This device performs piercing in a direction diagonal to the direction of movement of the slide of a press machine.The piercing unit is buried in a pad made of an elastic material without using a cam, and the piercing is performed in conjunction with the movement of the slide. The structure includes a pusher that pushes the piston rod of the unit.

(Problems to be solved by the invention) However, the above-mentioned conventional apparatus has the following problems. In other words, if a drive cam is used, it is difficult to operate the drive cam to center the hole, and when drilling multiple holes with different inclination angles, it is difficult to adjust the inclination angle. It is necessary to manufacture drive cams corresponding to the total number of holes and incorporate them into the mold, which poses problems in that the structure of the mold becomes complicated and the mold itself becomes larger. Also, if there is a large difference in the angle of inclination of multiple holes, or if there are a large number of holes with different angles of inclination, it is difficult to drill in one process, so drilling in multiple processes is necessary. There is a problem that this becomes necessary and productivity decreases. Further, since the drive cam needs to be machined to correspond to the holes having different inclination angles, the number of machining steps increases and the cost of the mold increases.

Next, in the device disclosed in Japanese Patent Application Laid-Open No. 58-212820, since an elastic body is used for the pad, there are the following problems. That is, when a pusher is used to press a piercing unit embedded within a pad made of an elastic body, the pad, which is an elastic body, is easily bent, so the pressing force must always be applied to the center of the piercing unit. If the point of application of this pressing force deviates from the center of the piercing unit, the pad, which is an elastic body, will be bent, causing a misalignment between the piercing punch and the button die, making it impossible to make a hole. The pad made of this elastic body is subject to severe fatigue and wear over time due to the repeated operation of the mold, and this fatigue and wear causes a shift in the point of application of the pressing force. The problem is that the pads must be replaced frequently to maintain accuracy.
Furthermore, since the piercing unit is surrounded by a pad made of an elastic body, the piercing unit exhibits a floating state in a sense. Therefore, when multiple slanted holes are drilled, the piercing punch of each piercing unit receives pressing force from the pusher, so this pressing force is uniform, and the point of application of the pressing force does not coincide with the center of each piercing unit. In this case, the pad made of an elastic body is deformed by the respective pressing forces, resulting in misalignment of the axes of the piercing punch and the button die. If the axes of the piercing punch and the button die are misaligned in this way, there is a problem that the piercing punch and the button die are damaged, and there is also a problem that burrs are generated. In order to minimize the deformation of the pad made of elastic material, the thickness of the elastic material surrounding the piercing unit must be increased, so the external shape near the hole of the product made with the piercing unit must be increased. Since it is not possible to perform punching, and this contour punching must be performed in a separate process, there is a problem in that productivity is reduced.

The present invention provides a press die for punching inclined holes, which simplifies the mold by eliminating the machining cam, and eliminates the problems associated with the elastic body by eliminating the use of an elastic body in the pad.

(Means for Solving the Problems) In order to achieve the above object, the present invention embeds a punching die in the inclined part of the lower die punch which is inclined with respect to the moving direction of the upper die, and A pad made of an inelastic body is disposed between the lower die punches, and is slidably guided and moved within a predetermined range in the moving direction of the upper die, and presses the workpiece on which the lower die punches are placed. A hole punch, which is along the axis of the hole punch die and perpendicular to the inclined surface and is pressed by the upper mold, is installed in the pad portion facing the hole punch die through a retainer, and The present invention is characterized in that the retainer portion is provided with forced return means for returning the hole punch pushed out by the lowering of the upper die.

(Function) By configuring the present invention as described above, since the pad is an inelastic body, even if pressing force is applied to the hole punch incorporated in the pad via the retainer, the pad will not be affected by the pressing force. Not deformed. As a result, if the axis of the punching die provided on the lower punch and the axis of the hole punch incorporated in the pad are aligned at the initial stage, misalignment between the two axes will not occur. In this way, since there is no deformation of the pad, misalignment of the axes of the hole punch and the hole die is prevented, so even if multiple holes with different inclinations are made, there is no misalignment of the axes between the two. It is possible to drill multiple holes with different slopes. Then, by lowering the upper die, the pad presses the workpiece placed on the lower die, and by lowering the upper die, pressing force is applied to the hole punch built into the pad, and the punch is pushed out. This allows for accurate drilling. When the upper die is lifted up after drilling is completed and the pressing force of the hole punch is released, the hole punch is housed in the pad by forced return means.

(Example) Embodiments of the present invention will be described based on the drawings.

In FIG. 1, the press die of the present invention includes an upper die 1 which is attached to a slide ram (not shown) of a press machine and moves back and forth, a lower die punch 3 on which a panel 2 having an inclined surface is placed, and an upper die 1. The pad 4 is generally composed of a pad 4 that descends as the pad 4 descends and presses the panel 2 as a workpiece.

The upper mold 1 has a guide post 5 hanging from the upper bottom surface as a guide for sliding the pad 4 along the moving direction of the upper mold, and a side pin that restricts the movement range of the pad 4 above the side wall 1a of the upper mold. 6 is inserted into the outer wall and protrudes inward. Further, a plate plate 9 is provided at the bottom of the side wall, which forms an inclined surface expanding outward, and has a protrusion 8 for pressing a punching punch 7, which will be described later, when the upper die 1 is lowered. Furthermore, there is a thick bottom part 1b below the tip of the inclined part, and on this bottom part 1b, in line with the outer surface of the lower die punch 3,
A cutting blade 10 is provided to cut the outer shape of the panel 2.

The pad 4 has a pad inclined surface 4b facing the inclined surface of the lower die punch 3 in order to press the inclined surface of the panel 2 on its downward inclined portion 4a.
In order to fit the punching die 11 embedded in the slope of the
A hole punch 7 that is aligned with the axis of 1 is incorporated via a retainer 12.

The hole punch 7 inserted into the retainer 12 has a compression spring 13 interposed in the gap with the retainer 12, so that the hole punch 7 is always inserted into the side wall 1a of the upper die.
It is configured to include a forced return means for pressing it to the side.

Further, in order to fit the guide post 5 of the upper die 1 into the upper end surface of the pad 4, a guide hole 15 into which a guide bush 14 is inserted and a recess 16 for storing an elastic body as a pad wiper are formed.
A center shaft 17 is erected on the upper surface of the pad 4, and a hollow bush 18 made of an elastic material such as urethane rubber is fitted onto the center shaft 17 in accordance with the gap with the upper bottom surface of the upper die 2.

Further, the outer wall of the pad 4 is provided with a recess or horizontal structure 19 into which the tip of the side pin 6 can be inserted and moved by a predetermined range S.

The lower punch 3 has an upper surface shaped to match the shape of the panel 2, and is provided with a strip hole 20 communicating with the bottom of the punching die 11.

Further, FIGS. 2 and 3 show the structure of the hole punch 7 and the retainer 12, which are equipped with forced return means. Reference numeral 21 denotes a rotation prevention plate for the punch 7 fixed to the retainer 12 by screws 22, and 22 denotes a guide bush for preventing the punch 7 from rattling. Further, a recess 23 is formed at the upper end of the hole punch 7 so that the protrusion 8 of the plate 9 of the upper die 1 is engaged therewith. Note 24, 25
are bolts for fixing the retainer 12 to the pad 4.

Next, the operation of this embodiment will be explained.

When the upper die 1 is lowered by the slide ram, the side pin 6 of the pad 4 is positioned at the upper end of the recess 19 of the pad 4 due to its own weight. First, the pad slope 4b is the panel 2 placed on the lower die punch 3.
Press and restrain.

On the other hand, the hole punch 7 in the retainer 12 is in pressure contact with the plate plate 9 of the upper die due to the repulsive force of the compression spring 13 of the forced return means.
The tip of the hole punch 7 is located on the pad slope 4b or at a position recessed from the slope.

In this way, when the upper die 1 further descends from the state where the pad 4 pinches the panel 2 with the lower die punch 3, the hollow bush 18 of the elastic body at the upper end of the pad 4
is compressed, further pressing the panel 2, and the side pin 6 of the upper mold moves below the recess 19, and the protrusion 8 of the plate 9 on the side wall 1a of the upper mold 1 presses the upper end of the hole punch 7 with the compression spring. 13
Press against the repulsive force of In other words, when the upper mold 1 is lowered by a predetermined distance S after the pad 4 contacts the panel 2, the hole punch 7 is moved by a distance S _{of 1} minute due to the movement of the plate 9 of the upper mold 1 (see Fig. 3). ). As a result, the hole punch 7 comes into contact with the panel 2, further penetrates the panel 2, and the punch die 11
A hole punching process is performed by inserting the hole into the hole.

On the other hand, at the same time, the panel portion at the end of the lower die punch 3 is cut by the cutting blade 10 of the upper die 1, and the outline punching is completed.

When the predetermined punching process is completed, the upper mold 1 is raised. However, in the pad 4, the side pin 6 has a recess 19.
Hold down panel 2 and do not move until it moves to the top end. Accordingly, the gap between the pad 4 and the inclined surface portion of the upper mold 1 widens, and the punch 7 is ejected from the punch die 11 due to the repulsive force of the compression spring 13 and is housed in the pad 4.

After the side pin 6 comes into contact with the upper end of the recess 19, the pad 4 rises together with the upper mold 1, and the pressed panel 2 is taken out.

In the embodiments described above, side pins were used to move the upper die 1 within a predetermined range, but a pad movement regulating member such as a Dutch men may also be used instead.

Further, other elastic bodies can be used for the compression spring 13 and the urethane rubber hollow bush 18, respectively. Further, although a guide post is used as a means for guiding the pad relative to the upper mold, it is also possible to eliminate rattling by constructing a guide frame within the inner wall of the upper mold that abuts the side wall of the pad. Further, other embodiments will be described along with their effects based on the drawings.

In FIG. 4, 30 is a fixed cam attached to the upper die 1, 31 is a hole punch unit arranged at different inclination angles, and 32 is a pad wiper made of urethane rubber.

FIG. 5 is a detailed configuration diagram of the hole punch unit 31, in which the hole punch 7 is inserted into a punch holder 34 in the retainer 12 and held by a ball 35 and a coil spring 36.

The upper part of the punch holder 34 is threaded into a tip 37a of the head 37 of the hole punch unit 31 which abuts the fixed cam 30, so that the punch holder 34 is integrated.

As the press machine descends, the fixed cam 30 hits the head 37 of each hole punch unit 31, and the punch holder 34 and hole punch 7 move to the pad 4.
A detent 21 fixed to the retainer 12 descends while sliding against the retainer 12.

At this time, due to the movement of the fixed cam 30, the head 3
7 presses the spring 38 built into the punch holder 34, and further presses the pin engaging piece that engages with the side pin 12a provided integrally with the retainer 12, so the spring 38 is compressed. The state will be as follows. Moreover, the punch holder 34 and punch 7 can be lowered relative to the retainer 12 by the distance S ₁ of movement pushed out by the fixed cam 30 to punch a hole in the panel 2.

The operation of this embodiment configured in this way will be described next. Since the pad 4 is an inelastic body, even if a pressing force is applied to the hole punch 7 incorporated into the pad 4 via the retainer 12, the pad 4 will not be deformed by the pressing force. As a result, if the axis of the hole punching die 11 provided on the lower punch 3 and the axis of the hole punch 7 incorporated in the pad 4 are aligned at the initial stage, the deviation of the axis between the two can be avoided. does not occur. Since there is no deformation of the pad 4 in this way, misalignment of the axis of the punch die 11 and the axis of the hole punch 7 is prevented, so it can be used even for holes with different inclinations as shown in Fig. 4. It is possible to simultaneously drill multiple holes with different inclinations without misalignment of the axes between the two. Then, by lowering the upper die 11, the panel 12 placed on the lower die punch 3
is pressed by the pad 4, and then the upper die 1 is lowered to apply a pressing force to the punch 7 built into the pad 4 to push out the punch 7, thereby aligning the axis of the punch 7 with the hole punch 7. Since the axes of the die 11 are aligned, accurate drilling can be performed.
When the upper die 1 is lifted up after the completion of drilling and the pressing force of the hole punch 7 is released, the hole punch 7 is moved by the spring 13 or the spring 3 shown in FIG.
It is housed in the pad 4 by 8.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, the pad is made of an inelastic material, so that the pad does not deform even when a pressing force is applied to the hole punch. Then, a hole punch was installed in the pad made of inelastic material through a retainer, and the axis of the hole punch was aligned with the axis of the hole punch die provided in the lower punch, so that the upper mold This makes it possible to maintain the axes of the two in a consistent state even when a pressing force is applied to the hole punch. This allows multiple holes with different inclination angles to be drilled at the same time, and since the axis of the hole punch and the hole die are always aligned, no punching burrs occur. There is no interference between the punching dies and there is no possibility of damage. Furthermore, since no drive cam is used, the structure is simplified and the mold itself can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional configuration diagram showing the first embodiment of the present invention, Fig. 2 is a plan view of the retainer and hole punch portion in Fig. 1, and Fig. 3a is a line A-A in Fig. 2. 3b is a perspective view of the upper part of the punch shown in FIG. 3, FIG. 4 is a schematic sectional view of the main part showing another embodiment, and FIG. FIG. 5b is a perspective view of the head of the punch unit shown in FIG. 5, and FIGS. 6 and 7 are partial sectional views of a conventional press die. 1... Upper die, 2... Panel, 3... Lower die punch, 4... Padded, 7... Hole punch, 11...
...Drilling die, 12...Retainer, 13...Spring (forced return means).

Claims (1)

[Scope of utility model registration request] A punching die is buried in the inclined part of the lower die punch which is inclined with respect to the moving direction of the upper die, and is slidably guided within a predetermined range in the moving direction of the upper die between the upper die and the lower die punch. A pad made of an inelastic material is disposed to press the workpiece placed on the lower die punch while moving along the axis of the punching die, and a pad made of an inelastic body is provided to press the workpiece placed on the lower die punch, and a pad made of an inelastic body that faces the punching die is provided along the axis of the punching die. A hole punch perpendicular to the surface and pressed by the upper mold is assembled into the pad via a retainer, and a forced return of the hole punch pushed out by the lowering of the upper mold is returned to the retainer part. A press mold for punching inclined holes, which is equipped with means.