JPH08206750A - Press piercing device - Google Patents

Abstract

PURPOSE: To execute piercing with one die in piercing upper/lower two holes to a cylindrical work with a press as well as the work having different distance between upper/lower holes. CONSTITUTION: A lower punch 20 and lower die 16 are arranged to a lower die assembly 11, an upper punch 30 and upper die are arranged to an upper die 12, a lower hole is pierced to a cylindrical work 13 with the lower punch 20 and lower die 16, an upper hole is pierced to the work 13 with the upper punch 30 and upper die 28. Further, each piercing is executed while the lower die assembly 11 takes the lower end of work 13 for reference and the upper die assembly 12 takes the upper end of work 13 as reference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press punching device for punching a cylindrical work in two steps by pressing.

[0002]

2. Description of the Related Art Conventionally, for example, there is a motor frame formed by rolling a steel plate into a cylindrical shape. For example, when a hole for ventilation is formed in the cylindrical work in two steps, As shown in FIG. 7, a lower die 1 is provided with a punch 2 and a die 3 in two upper and lower stages, whereby a work 4 having a lower hole 5 and an upper hole 6 formed therein is provided. There is.

[0003]

However, in the case of the above, as shown in FIGS. 8 and 9, the number and shape of the holes 5 and 6, and the respective ends of the workpieces 4 and 7 to the holes 5 and 6, respectively. Even if the distance is the same, if the distance between the upper and lower sides of the holes 5 and 6 is different due to the different lengths of the works 4 and 7, different molds having the punch 2 and the die 3 according to the difference are required. This leads to an increase in die cost and an increase in setup time.

The present invention has been made in view of the above circumstances, and therefore, an object of the present invention is to form a hole in a cylindrical work in two steps, that is, even if the distance between the holes is different. It is to provide a press punching device that can do it in one mold.

[0005]

In order to achieve the above object, in the press punching device of the present invention, a lower die and an upper die are provided with punches and dies, respectively, and thereby a cylindrical work is vertically moved. The feature is that holes are made in two steps.

[0006] In this case, it is preferable that the lower die determines the positions of the punch and the die with the lower end of the work as a reference and the upper die uses the upper end of the work as a reference to form holes in the work in two upper and lower stages.

[0007]

According to the above means, the punch and the die provided on the upper die are positioned relative to the punch and the die provided on the lower die according to the distance between the upper and lower sides of the hole opened in the work by the upper and lower positions of the upper die. Then, in this state, the lower and upper holes can be formed in the work.

In this case, in particular, the lower die is based on the lower end of the work, and the upper die is based on the upper end of the work. In this case, the work is set in the lower die, and then the upper die is lowered until it hits the upper end of the work, so that the lower die punch and die and the upper die punch and die are placed between the upper and lower holes of the hole. The hole can be drilled by setting it at a position according to the distance, and in this case, even if the length of the work varies, the hole can be drilled without changing the distance from both ends of the work. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 shows a lower mold 11, an upper mold 12, and a cylindrical work 13. Of these, the lower mold 11 has a lower mold holder 14 as a base body, and a core metal 15 is provided upright at the center of the upper surface of the lower mold holder 14. The cored bar 15 has a thick cylindrical shape on its peripheral wall, and for example, three lower dies 16 are arranged on the outer peripheral part of the lower part, and three upper dies described later enter the outer peripheral part of the upper part (see FIG. 2). ) Is formed.

Around the cored bar 15 on the lower die holder 14, three slide blocks 18 shown in FIG. 2 are arranged.
The slide blocks 18 are supported on both sides by two guide blocks 19, respectively, and are movable in the direction of the core bar 15 and the direction of the counter core bar 15. Lower punch 2 corresponding to die 16
0 is mounted, and the auxiliary block 21 is mounted on the upper part.
Further, a slant surface 22 is formed on a portion of the slide block 18 on the side opposite to the core 15 and a fixed backup block 23 for moving the slide block 18 is arranged on the side of the side opposite to the core 15.

On the other hand, the upper die 12 has an upper die holder 24.
The upper die plate 25 is suspended below the upper die holder 24 by, for example, four bolts 26 shown in FIG. 3, and is elastically biased and held by a spring 27. In addition, the upper mold plate 25 has a lower surface,
The upper die 28 is aligned with the concave portion 17 of the core metal 15, and a slide block 29 that moves similarly to the slide block 18 is aligned with the core block 15 side of the auxiliary block 21. , The upper die 28 on the upper die 28 side of the slide block 29.
The upper punch 30 corresponding to is attached. In addition, a cam 32 having an inclined surface 31 corresponding to the inclined surface 22 of the slide block 18 is provided outside the upper die plate 25 of the upper die holder 24.

The work 13 is, for example, a frame of a motor and is formed into a cylindrical shape by rolling a steel plate and welding both ends thereof.

Next, the operation of the above structure will be described. The work 13 has no hole before processing, and the work 13 is fitted and set on the outer periphery of the cored bar 15 from the state shown in FIG. Next, when the pressing operation is started, the upper die holder 24 is lowered, so that the upper die plate 25 causes the upper die 28 to enter the concave portion 17 of the cored bar 15 and causes the slide block 29 to move from the auxiliary block 21. It is positioned on the side of the cored bar 15 and stops at the upper end of the work 13. As a result, the upper punch 30 and the upper die 28 provided on the upper die 12 are different from the lower punch 20 and the lower die 16 provided on the lower die 11, respectively.
The work 13 is set at a position corresponding to the distance between the upper and lower sides of the hole.

Then, by continuing the pressing operation in this state, the upper die holder 24 is further lowered to compress the spring 27, and the slant surface 31 of the cam 32 is slidably contacted with the slant surface 22 of the slide block 18. The slide block 18 is moved to the core metal 15 side, and the slide block 29 is also moved to the core metal 15 side from the slide block 18 via the auxiliary block 21. Therefore, the lower punch 20 and the upper punch 30 also move to the core metal 15 side, the lower punch 20 punches out the lower part of the work 13 and enters the lower die 16, and the upper punch 30 punches out the upper part of the work 13 and punches the upper die. By entering the inside of the work 28, the holes 33 and 34 are formed in the upper and lower two stages of the work 13 (see FIGS. 4 to 6).

After punching, since the upper die holder 24 is raised, the cam 32 is also raised, whereby the slide block 18 is released from the pressing by the cam 32 and returned to the original position by the force of the return spring (not shown). Therefore, the lower punch 20 is also pulled back from the lower die 16, and the slide block 29 is also released from the pressing by the slide block 18 and returned by the force of the return spring (not shown), and the upper punch 30 is pulled out from the upper die 28. Then, in that state, the slide block 29, the upper punch 30,
With the upper die 28, the upper die plate 25 ascends and returns together with the upper die holder 24.

As described above, according to this structure, the upper punch 30 and the upper die 28 provided on the upper die 12 are placed on the lower die 20 and the lower die 16 provided on the lower die 11 depending on the vertical position of the upper die 12. , The holes 33, 34 opened in the work 13 are set at positions corresponding to the distance between the upper and lower sides, and in this state, the holes 3
3 and 34 can be opened in the work 13, and even for works with different vertical distances between the holes 33 and 34,
It is possible to set the upper punch 30 and the upper die 28 at appropriate positions to open the holes 33 and 34, and since they can be performed by one mold, compared with the conventional one that requires a plurality of molds. However, the mold cost and setup time can be reduced.

Further, particularly in the above-mentioned construction, the lower die 11 is based on the lower end of the work 13 and the upper die 12 is based on the upper end of the work 13, and the lower punch 20, the lower die 16 and the upper punch 30 are respectively formed. Since the position with respect to the upper die 28 is determined, the work 13 is set on the lower die 11, and then the upper die 12 is lowered until it abuts on the upper end of the work 13, so that the lower punch 20 and the lower die 16 are placed. Also, the upper punch 30 and the upper die 28 are set at positions corresponding to the distance between the upper and lower sides of the holes 33 and 34 to be formed in the work 13, and the holes can be formed.
Moreover, in this case, even if the length of the work 13 varies, the holes 33 and 34 can be opened without changing the distances from both ends of the work 13, and the accuracy can be improved.

[0018]

The press punching device of the present invention is as described above, and has the following effects. Firstly, a cylindrical work having two upper and lower holes punched by a press is provided with a lower die having a lower punch and a lower die, and an upper die having an upper punch and an upper die. By making the lower hole in the work with the lower die and the upper hole in the work with the upper punch and the upper die, even for works with different distances between the upper and lower holes, one mold can be used. The holes can be drilled, and the mold cost and setup time can be reduced.

Secondly, the lower die determines the positions of the lower punch, the lower die and the upper punch, and the upper die with respect to the lower end of the work and the upper die with respect to the upper end of the work. By making holes, the lower punch, lower die, upper punch, and upper die can be easily set, and even if the work length varies, the holes can be separated from both ends of the work. You can open without making a difference, and you can improve the accuracy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an entire pre-processing state showing an embodiment of the present invention

FIG. 2 is a plan view of the lower die before processing.

FIG. 3 is a plan view of the upper die before processing.

FIG. 4 is a vertical cross-sectional view of the entire machining execution state

FIG. 5 is a plan view of a lower die machining execution state.

FIG. 6 is a plan view of an upper die machining execution state.

FIG. 7 is a view corresponding to FIG. 4 showing a conventional example.

FIG. 8 is a front view of the workpiece after processing.

FIG. 9 is a front view of a different work after being processed.

[Explanation of symbols]

11 is a lower die, 12 is an upper die, 13 is a work, 16 is a lower die, 20 is a lower punch, 28 is an upper die, 30 is an upper punch,
33 and 34 show holes.

Claims (2)

[Claims] 1. A cylindrical work having a hole formed in two stages by pressing, comprising a lower die having a lower punch and a lower die, and an upper die having an upper punch and an upper die.
A press punching device characterized in that a lower hole and a lower die are used to make a lower hole in the work, and an upper punch and an upper die are used to make an upper hole in the work. 2. The lower die determines the positions of the lower punch, the lower die and the upper punch, and the upper die with respect to the lower end of the work and the upper die with respect to the upper end of the work, and the lower and upper holes are opened. The press punching device according to claim 1, wherein: