JP2693080B2 - Knockout molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knockout portion forming method for forming a knockout portion into a plate shape.

[0002]

2. Description of the Related Art Conventionally, in order to form a knockout portion into a plate shape, a dedicated mold is adopted according to the shape and size of the knockout portion, and the knockout portion is formed by single-shot machining. Is common. In addition, the molding process of the knockout part is a shape generally used for wiring outlets of electrical parts, etc.If it is unknown whether to use it, shape this shape, tap it when using it, remove the wiring, etc. The shape of the product to pass through is molded.

[0003]

By the way, when the knockout portion is formed into a plate shape as described above, if the dimensions are changed, it is necessary to remanufacture a new mold.
Also, when performing molding processing of knockout parts of different sizes, since the mold is dedicated, several types of molds are required, and the molds will be replaced each time,
There was a problem that it took a lot of time and labor.

The object of the present invention is to cope with the progress of automation of press machines in order to solve the above problems, and by using three molding dies regardless of the molding shape, the molding length of the intermediate portion in the knockout portion is used. It is possible to provide a method for forming a knockout portion in which the accuracy of the joint portion of the knockout portion can be improved and the knockout portion can be variously changed.

[0005]

In order to achieve the above object, the method of forming a knockout portion according to the present invention is such that the one end side and the other end side have different shapes, and A method for forming a knockout portion, wherein a knockout portion having a molding shape of an intermediate portion connected to an end side different from that of the one end side and the other end side is formed on a plate material (W) by a punch press. After the molding process is performed by the first molding die (7a) provided in the punch press, the molding process by the second molding die (7b) provided in the punch press is continuously performed on one end side thereof. The intermediate part is formed by repeating once or continuously a plurality of times, and then the other end is formed continuously by the third forming die (7c) provided in the punch press for the intermediate part. Processing And it is characterized in Ukoto.

[0006]

Knockout portion in which the molded shape on the one end side and the molded shape on the other end side are different and the molded shape of the intermediate portion connecting the one end side and the other end side is different from the molded shapes on the one end side and the other end side. When forming the plate material (W) with a punch press, first one end of
Molding is performed by the molding die (7a). afterwards,
The intermediate part is formed by repeating the forming process by the second forming die (7b) provided in the punch press continuously on one end side once or continuously a plurality of times. Next, the other end side is continuously formed by the third forming die (7c) provided in the punch press in the middle part.

Thus, by using the three molding dies of the first molding die (7a), the second molding die (7b) and the third molding die (7c), the knockout portion The molding length of the intermediate portion can be freely changed.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. Since the punch press has a known structure, its illustration and description are omitted.

Referring to FIG. 1, a punch press 1 is rotatably provided with an upper turret 3 and a lower turret 5.
On the circumferences of the upper and lower turrets 3, 5, the first to third molding dies 7a, 7b, 7c are formed as upper dies 9a, 9b, 9c and lower dies 11a, 11b at positions corresponding to each other.
11c and are installed. A striker 13 is provided directly above the upper molds 9a, 9b, 9c. In the state shown in FIG. 1, the striker 13 operates and the pressing force lowers the upper die 9a, and the upper die 9a cooperates with the lower die 11a to cooperate with the lower die 11a to form the tip portion (one end The side) is being molded. When the striker 13 is raised, the upper mold 9a has a well-known structure, so the illustration thereof is omitted. However, the upper mold 9a is in a raised position apart from the lower mold 11a by a spring or the like.

The structure of the above-mentioned partial mold 9a and the lower mold 11a as the first molding mold 7a in the first step is as shown in FIG. 1, FIG. 2 and FIG. It is mounted on the circumference of and is vertically movable. That is, the punch head support members 21 and 23 are integrally provided on the upper part of the punch holder 15 which is one member constituting the upper mold 9 a by the fastening members 17 and 19, and the fastening member 25 is provided on the upper surface of the punch head support member 23. Thus, the punch head 27 is integrally mounted.

A die main body 29a for the first step is fixed to the lower portion of the punch holder 15 by a fastening portion 31, and a stepped hole 31H is formed at the axial center of the die main body 29a. A vertically movable U-shaped ejector 33a is inserted into the mounting hole 31H, and the ejector 33a
A is biased in the projecting direction by, for example, a spring or the like as an ammunition machine 35 provided in the punch holder 15, and the ejector 33a is positioned by abutting the step portion 37 of the stepped hole 31H. Further, on the lower surface of the mold body 29a, the entire U-shaped molding die 3 is formed in a semicircular shape on the front side (the left side in FIGS. 1 and 2) of the molding portion Ws in the traveling direction.
Nine has been ablated. Incidentally, reference numeral 41 is a mold body 29a.
It is a key groove provided in the and is locked by the key 43.

A lower mold 11a, which is formed in cooperation with the upper mold 9a, is provided on the circumference of the lower turret 5 so as to face the upper mold 9a. That is, the mold main body 45a for the first step, which is one member constituting the lower mold 11a, is attached to the lower turret 5, and a protrusion 47 is formed on the mold main body 45a. A U-shaped molding die 49 having the same size is formed so as to be engaged with the U-shaped molding die 39 formed in the mold body 29a as the upper mold 9a.

The molding die 49 provided on the upper surface of the protrusion 47 has a rectangular notch 51 formed at the front end side (left side in FIGS. 1 and 2) of the molding portion Ws in the traveling direction. An arcuate chamfered portion 53 is formed in an appropriate range on the rear end side (the right side in FIGS. 1 and 2) of the molding portion Ws in the traveling direction of the upper surface of the portion 47.

The ejector 55a mounted on the protrusion 47 and having a vertically movable U-shaped hole is engaged with the mold body 45a by a plurality of stopper bolts 57 and a plurality of connecting bolts 59. The stopper bolt 57 is inserted in a stepped hole 61 formed in the mold body 45a, and the connecting bolt 59 is vertically movably inserted in a through hole 63 formed in the mold body 45a. Connecting bolt 59
The lower end of the is screwed to the push-up plate 65.

The push-up plate 65 is mounted movably up and down on a plurality of guide rods 67 hanging from the lower surface of the mold body 45a, and a spring receiving plate 69 is locked to the lower portion of the guide rods 67, and the springs. A spring or the like is mounted as an ammunition 71 between the receiving plate 69 and the push-up plate 65. Then, the push-up plate 65 is always driven by the elastic force of the bullet 71.
Rises, and the ejector 55a rises via the connecting bolt 59 and is stopped at the upper limit by the stopper bolt 57. That is, the upper surface of the ejector 55a and the mold body 45
It is flush with the upper surface of a.

With the above structure, the molding portion Ws for molding the knockout portion on the plate material W is positioned at the position of the molding die 49 of the die body 45a of the lower die 11a. And
When the striker 13 is actuated and the upper die 9a is pressed, the molding die 39 provided on the die body 29a is engaged with the molding die 49 provided on the die body 45a of the lower die 11a, and the die body 29a. The ejector 55a provided on the die main body 45a is pushed by the lower surface of the plate body W through the plate material W and descends. The forming portion Ws of the plate material W is pushed up and formed by the lowering of the ejector 55a. At this time, the plate material W and the forming portion Ws are held by a tab T (a tab T on the left side in FIG. 6) which is a partially cut portion, and a curved surface is formed at the rear portion of the forming portion Ws by the chamfered portion 53. . Furthermore, the ejector 33a biased by the ammunition 35 provided in the upper mold 9a is equipped as a measure against biting of the product.

By the above-mentioned operation, the front end of the forming section Ws is formed and the first step is completed. When the molding operation is completed, the above-described operations are reversed to return the upper and lower molds 9a and 11a.

The structure of the upper mold 9b and the lower mold 11b as the second molding mold 7b in the second step is different from the structure adopted in the above-mentioned first step, and different members are formed in the mold body. The only difference is the molding die and ejector
The other constituent members are exactly the same members, and illustration and explanation of these constituent members are omitted, and only different members will be described.

Referring to FIGS. 3 and 5, the upper die 9
Mold body 29b for the second step, which is one member constituting b
The ejector 33b is inserted into the ejector 33b.
b has a rectangular shape. On the lower surface of the die main body 29b, a concave molding die 73 having walls on both sides is formed in parallel with the traveling direction of the molding portion Ws (left direction in FIG. 3).

A protrusion 75 is formed on the mold main body 45b for the second step, which is one member constituting the lower mold 11b for performing the molding in cooperation with the upper mold 9b, and the protrusion 75 is formed.
In the forming die 77 provided on the upper surface of the forming part Ws, angular notches 79 are formed at predetermined intervals on both sides in parallel with the traveling direction of the forming part Ws.
An arc-shaped chamfered portion 53 is formed in an appropriate range on the rear end side (the right side in FIG. 3) in the traveling direction of s.

With the above-described structure, the tip side (one end side) of the forming part Ws, that is, the left end side in FIG. 6 is pushed up in the above-mentioned first step, and the upper die 9b in the second step.
Is operated a predetermined number of times, ie, once or continuously a plurality of times, so that the intermediate portion of the molding portion Ws, that is, the straight portion of the middle portion in FIG. Can be The plate material W and the forming part Ws are connected and held by a dove part T (a middle tab T in FIG. 6) which is a partially cut part, and the forming part Ws is formed in a state of being floated by the plate material W. become. Further, the molding die 7 of the second step including the curved surface formed by the chamfered portion 53 of the molding die 49 of the first step described above.
The curved surface is flattened by sequentially performing molding with Nos. 3 and 77, and the shape of the connecting portion can be finished with high accuracy.

The upper mold 9c and the lower mold 11c as the third molding dies 7c in the third step are different from those in the first step as in the second step. , The generating mold formed on the mold body and the ejector are different, and the other constituent members are exactly the same member,
Illustration and description of these constituent members are omitted, and only different members will be described.

Referring to FIGS. 4 and 5, the upper die 9
Mold body 29c for the third step, which is one member constituting c
The ejector 33c is inserted into the ejector 33c.
c is the rear end side in the traveling direction of the forming part Ws (right side in FIG. 4)
Has a semi-circular U-shape. The mold body 2
A U-shaped molding die 81 having a semi-circular shape on the rear end side in the traveling direction of the molding portion Ws is also formed on the lower surface of 9c.

A protrusion 83 is formed on the die main body 45c for the third step, which is a member constituting the lower die 11c for forming in cooperation with the upper die 9c, and the protrusion 83 is formed.
The molding die 85 provided on the upper surface of the mold has a rectangular notch 87 on the rear end side (the right side in FIG. 4) in the traveling direction of the molding part Ws.
Are formed.

With the above-described structure, since the straight portion, which is the intermediate portion of the forming portion Ws, is pushed up in the second step described above, the forming die 81 provided in the die bodies 29c, 45c in the third step is pushed up. , 85 completes the forming operation of pushing up the rear end side (the other end side) of the forming portion Ws, that is, the right end side in FIG. It should be noted that the plate material W and the forming portion Ws are connected and held by a tab portion T (a tab T on the right side in FIG. 6) which is a partially cut portion, and the forming portion Ws is formed in a state of floating above the plate material W. become.

With the above-mentioned structure, the operation will be described with reference to FIG. 6 and FIG.
In order to form the forming part Ws as shown in FIG. 1, first, the plate bodies W are assembled with the die main bodies 29a and 45a of the first step, and the forming process is performed by the lower die 9a and 11a.
The tip portion (one end side) of the forming portion Ws, that is, the left end side in FIG. 6 is formed. Then, the mold body 29b in the second step,
45b is incorporated and is molded by the lower molds 9b and 11b to continuously mold the middle part of the molding part Ws, that is, the straight part of the middle part in FIG. 6, to the tip side (one end side). Then, the die bodies 29c and 45c in the third step
Then, the molding process is performed by the upper and lower molds 9c and 11c, and the rear end side, that is, the right end side in FIG.

By the above-described forming operation, the forming portion Ws is floated above the plate material W as shown in FIG. 7, and the plate material W and the forming portion Ws are connected and held by the tabs T arranged at a plurality of positions. The length L of the forming portion Ws can be set freely, and by performing the forming operation of the second step once or continuously a plurality of times according to the length L, it is possible to correspond to the desired length. .

Thus, regardless of the shape of the molding part Ws, that is, the product part, the mold in the second step can be operated a predetermined number of times, that is, by operating it once or continuously a plurality of times, so that the mold can be replaced each time. It is possible to improve workability without the need to perform any work or to prepare many molds. Further, the mold body 45a in the first step and the mold body 4 in the second step
By providing the arc-shaped chamfered portion 53 on the upper surface of 5b, the accuracy of the connecting portion can be improved by the feed processing, and the above-described effect makes it possible to cope with the progress of automation of the press machine.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

[0030]

As can be understood from the above description of the embodiments, according to the present invention, since the construction is as described in the claims, the knockout portion is formed in the plate material in three steps. And divide the second molding of the second process into 1
It is possible to change the length of the intermediate portion in the knockout portion by performing the operation once or continuously a plurality of times.

Since the same mold can be used even if the length of the intermediate part in the knockout part is changed, there is no need to replace the mold, and it is not necessary to prepare many molds and workability is improved. It is possible to cope with the progress toward automation of press machines.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an upper die and a lower die, which are molding dies, showing a main part of the present invention.

FIG. 2 is a sectional view showing a part of an upper mold and a lower mold in a first step.

FIG. 3 is a cross-sectional view showing a part of an upper mold and a lower mold in a second step.

FIG. 4 is a sectional view showing a part of an upper mold and a lower mold in a third step.

FIG. 5 is a side view showing a part of an upper mold and a lower mold that are used for each process.

FIG. 6 is a plan view of a molding portion in a knockout portion.

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6;

[Explanation of symbols]

 1 Punch Press 3 Upper Turret 5 Lower Turret 7a 1st Mold 7b 2nd Mold 7c 3rd Mold

Claims (1)

(57) [Claims] 1. A molding shape on one end side is different from a molding shape on the other end side, and a molding shape of an intermediate portion connecting the one end side and the other end side is different from the molding shapes on the one end side and the other end side. In a knockout portion forming method of forming different knockout portions on a plate (W) by a punch press, a first forming die (7
After performing the forming process according to a), the intermediate part is continuously formed on the one end side by repeating the forming process by the second forming die (7b) provided in the punch press once or continuously a plurality of times. Forming process of the knock-out part is performed by the third forming die (7c) provided in the punch press continuously with the intermediate part. Method.