JPH05245544A - Curling forming method by turret punch press and metallic die for the same - Google Patents

Abstract

PURPOSE:To shorten the time required for exchanging a metallic die and to improve the working efficiency by using one forming metallic die for three processes of curling forming. CONSTITUTION:A work W is horizontally held by a turret punch press, the tip end of the work W is curling formed by the cooperation of an upper forming metallic die 1 and a lower forming metallic die 61 in the three processes after allocating the upper and lower metallic dies 1, 61 fitted in the upper and lower turrets at the worked position. In the above-mentioned processes, the first and the second stage bending of the first and the second processes are carried out by using the working parts 5 and 65 provided on the upper and lower metallic dies 1 and 61 for the first and second processes and the third process bending is carried out by using the working parts 7 and 67 for the third process provided on the upper and lower forming metallic dies after the working parts for the first and second processes are elevated not to influence the work after the second stage bending is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curling molding method in a turret punch press for curling a work and a curling molding die used in the method.

[0002]

2. Description of the Related Art Conventionally, as a curling forming method in a turret punch press for bending an end portion of a work into a curl shape, the applicant of the present invention filed a prior application, and disclosed in JP-A-3-20412.
It is known as Japanese Patent No. 4 publication. That is, this forming method is to hold the work horizontally by a turret punch press,
When the upper and lower dies cooperate to process the curling molding on the tip of the work in three steps, the molding dies mounted on the turret are indexed to the processing position. Two
After bending the first section and the second section of the process, and after finishing the bending process of the second section, the upper die of the forming die is raised so as not to interfere with the work, and then another forming die is formed. The die is selected from the turret and indexed at the processing position to perform the bending in the third step.

[0003]

By the way, in the above-mentioned conventional curling molding method, the first and second curling methods are used.
The forming die for the process and the forming die for the third process are separate, and must be manually performed when exchanging with a normal punching die attached to the turret of the turret punch press. In addition, it was also limited in space.

Therefore, when carrying out the curling molding process, it is necessary to replace the mold, and this mold replacement takes time, and the working efficiency of the turret punch press is deteriorated. Further, since it becomes an obstacle when performing other processing, there is a problem that the mold is replaced or the workability is deteriorated to perform processing.

Further, there is a problem in that there is a space limitation and two molding dies must be used for the three-step processing.

In order to improve the above-mentioned problems, the object of the present invention is to make it possible to perform a curling molding process comprising three steps with one molding die, thereby shortening the time for exchanging the dies and improving the workability. An object of the present invention is to provide a curling molding method for a turret punch press and a curling molding die used for the method.

[0007]

In order to achieve the above-mentioned object, the present invention holds a work horizontally by a turret punch press and positions the upper and lower molding dies mounted on the upper and lower turrets at processing positions. When the curling molding is performed on the tip of the work in three steps by the cooperation of the indexing upper molding die and the lower molding die, for the first and second steps provided in the upper and lower molding dies. Bending of the first and second joints of the first and second processes is performed in the machining part of the above, and then, after the bending of the second joint is finished, the machining parts for the first and second processes interfere with the work. The curling forming method in the turret punch press is characterized in that the bending of the third step is performed in the processing portion for the third step provided in the upper and lower forming dies after the ascent is raised.

Further, the present invention is a curling molding die having a rectangular shape for carrying out curling molding processing on the tip of a work, and the bending processing of the first and second steps is performed by separating the curling molding die from the front and back of the molding die. A curling molding die was provided with a bending portion for the first and second steps to be performed and a bending portion for the third step to perform the bending step of the third step.

In this curling molding die, it is desirable that a rotating die is provided below the upper molding die in the bending portion for the first and second steps.

[0010]

By adopting the curling forming method in the turret punch press of the present invention and the forming die used in the method, when the curling process is performed on the tip of the work by the turret punch press in three steps, it is mounted on the turret. The processing parts for the first and second steps of the existing molding die are indexed to the processing positions, and the first node, which is the tip of the work in the first step, is bent by this molding die. Then, in the second and first process parts of the same molding die, the second joint is bent at a position away from the work tip by a predetermined amount in the second process, and then the same molding attached to the turret is performed. The curling of the third step is performed in the processing section for the third step of the die to complete the curling molding process.

During the bending process described above, when the second mold is finished, when raising the upper mold, a rotating mold is provided below the upper molding mold in the bending parts for the first and second processes. With the provision, even if the tip of the mold interferes with the work, the work can be released by the rotation of the mold, and curling molding can be performed by the turret punch press, and the productivity can be improved.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings. It should be noted that the upper and lower molds are mainly shown in the drawings, and the turret punch press for carrying out the present invention has a generally known configuration, and therefore, illustration and description thereof will be omitted.

First, of the upper and lower molds, which are the molding dies, the upper molding die will be described. The molding die is attached to the turret in advance.

Referring to FIGS. 1, 2 and 3, the upper molding die 1 is mounted on the circumference of the upper turret in a turret punch press (not shown) at appropriate intervals, and has a circular shape. Instead of being formed in a rectangular shape, the punch holder 3 is provided. The punch holder 3 accommodates a punch-side processing section 5 for the first and second steps and a punch-side processing section 7 for the third step.

Punch side processing section 5 for the first and second steps
The punch body 9 is mounted on the front side of the punch holder 3. A flange 11 is attached to the upper portion of the punch body 9 with a plurality of bolts 13 and the like, and a punch head 15 is attached to the protruding portion 9T of the punch body 9 with a bolt 17 and the like.

A key groove 19 is formed vertically on the outer wall of the punch body 9, and a key 23 attached to the punch holder 3 with a plurality of bolts 21 is engaged with the key groove 19. There is.

A hole 25 is formed on the lower side of the punch body 9 in the vertical direction from below. A pin 27 is attached to the upper portion of the hole 25 in a direction orthogonal to FIG. Further, the punch block 2 is provided at the lower end of the punch body 9.
9 is attached by a bolt 31, and one end of a pin 33 is fixed to the punch block 29.

A rotary punch 35 is rotatably attached to the pin 33. A pin 37 is attached to the upper left side of the rotary punch 35 in FIG. The pin 37 and the pin 27 are hooked by a bullet 39.

As the punch side processing section 7 for the third step, a punch guide 41 is mounted on the rear side of the punch holder 3. The punch body 4 is provided in the punch guide 41.
3 is mounted so that it can move up and down. A punch head 45 is integrated with the upper portion of the protruding portion 43T of the punch body 43.

Between the flange 47 provided on the upper part of the punch guide 41 and the punch head 45, there is an ammunition 49.
Is urged upward and is interposed. Punch body 4
A molding portion 51 and a guide portion 53 are provided at the tip (lower end) of the nozzle 3.

A striker 55 provided on an upper frame of the turret punch press is selectively positioned above the punch heads 15 and 45 by, for example, a hydraulic cylinder. In addition, the punch holder 3
As shown in FIG. 2, a plurality of tapered pin holes 57 are formed, and the tapered pin holes 57 are engaged with positioning pins provided on the upper turret of the turret punch press. The upper molding die 1 is positioned on the upper turret. Further, as shown in FIGS. 1 and 3, the side wall of the punch holder 3 is
An exchange hole 59 for exchanging the upper molding die 1 with an automatic die exchanging device is provided. For example, an exchange rod is mounted in the exchange hole 59, and the upper molding die 1 is attached and detached from the upper turret.

Referring to FIGS. 1, 4 and 5, a lower molding die 61 is mounted on the circumference of a lower turret of a turret punch press (not shown) at a position corresponding to the upper molding die 1. Moreover, like the upper molding die 1,
The die holder 63 has a rectangular shape instead of a circular shape.
Is equipped with.

The punch side processing part 5 for the first and second steps and the punch side processing part 7 for the third step of the die holder 63.
At a position corresponding to the die side processing portion 65 for the first and second processes.
And the die side processing part 67 for the third step is housed.

Die side processing section 65 for the first and second steps
The die body 69 is attached to the front side of the die holder 63 attached to the lower turret. An ejector plate 71 is vertically movably mounted on the die body 69. The ejector plate 71 is urged upward by the urging force of a urethane spring 73 inserted into the die body 69 to hold the work.

As the die side processing portion 67 for the third step, a die body 73 is attached to the die holder 63, and the position of the die body 73 corresponding to the guide portion 53 formed at the lower end of the punch body 43. A guide hole 75 is formed in the. Therefore, the guide portion 53 is inserted into the guide hole 75.

Tapered pin holes 77 are formed on the left and right sides of the front side of the die holder 63. The taper pins provided on the lower turret are attached to the tapered pin holes 77 to position the die holder 63 with respect to the lower turret. . Further, as shown in FIGS. 1 and 5,
The side wall of the die holder 63 is provided with an exchange hole 79 for exchanging the lower molding die 61 with an automatic die exchanging device. For example, an exchange rod is attached to the exchange hole 79, and the lower molding die 61 is attached and detached from the lower turret.

Next, the upper and lower molding dies 1, 61 of this embodiment
The operation of performing the curling molding process on the tip of the work by using will be described.

In FIG. 1, the work W is placed on the ejector plate 71, and the striker 55 is positioned above the punch head 15 and operated, so that the rotary punch 3 is moved.
As shown in FIG. 6, the first joint 81 is bent at the tip of the work W by the cooperation of the die 5 and the die body 69.

Subsequently, the work W is advanced by a predetermined amount, and the second joint 83 is bent in the second step. After the bending work of the second joint 83 is completed, the rotary punch 35 rises. However, as shown in FIG. 7, since the work W is bent at the first joint 81, the bending tip and the rotary punch are naturally formed. Molding part 3 of 35
Although it interferes with 5S, the rotary punch 35 rotates around the pin 33 as a center of rotation against the repulsive force of the ammunition machine 39, so that interference can be avoided. When the buffer portion escapes, the rotary punch 35 returns to the old position again by the tensile force of the bullet 39.
Next, as shown in FIG. 8, when the striker 55 is positioned above the punch head 45 and the striker 55 is actuated, the punch body 43 and the die body 73 cooperate with each other to work the forming portion 43S of the punch body 43. The tip of W can be rounded and curled to form a product.

As described above, the curling molding process in the first, second and third steps can be performed by one molding die. Therefore, it is possible to shorten the time for exchanging the dies and improve the work efficiency.

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

[0032]

As can be understood from the above description of the embodiment, according to the present invention, since the construction is as described in the claims, the first molding die is used. The curling molding process including the second and third steps can be performed. Therefore, it is possible to shorten the time for exchanging the dies and improve the work efficiency.

[Brief description of drawings]

FIG. 1 is a side sectional view of a molding die for curling molding according to the present invention.

FIG. 2 is a plan view of an upper molding die in FIG.

FIG. 3 is a front view of FIG.

FIG. 4 is a plan view of the lower molding die in FIG.

FIG. 5 is a front view of FIG.

FIG. 6 is a side view showing a state in which the first bending of the first step is performed on the tip of the work.

FIG. 7 is a state diagram of the upper and lower molding dies after performing the second joint bending of the second step on the tip of the work.

FIG. 8 is a state diagram when the curling bending of the third step is performed on the work with the upper and lower molding dies.

[Explanation of symbols]

 1 Upper Mold 3 Punch Holder 5 Punch Side Processing Part for 1st and 2nd Process 7 Punch Side Processing Part for 3rd Process 9 Punch Body 15 Punch Head 33 Pin 35 Rotating Punch 43 Punch Body 45 Punch Head 61 Lower molding die 63 Die holder 65 Die side processing part for the first and second steps 67 Die side processing part for the third step 69 Die body 71 Ejector plate

Claims (3)

[Claims] 1. The work is held horizontally by a turret punch press, and the upper and lower molding dies mounted on the upper and lower turrets are indexed to a processing position to cooperate with the upper and lower molding dies. When processing the curling molding on the tip of the work in three steps, the processing parts for the first and second steps provided in the upper and lower molding dies are used in the first and second steps of the first and second steps. After bending the two joints, and after finishing the bending of the second joint, raise the processed parts for the first and second steps so as not to interfere with the work, and then to the upper and lower molding dies. A curling forming method in a turret punch press, characterized in that bending is performed in the third step in a processing portion provided for the third step. 2. A curling molding die having a rectangular shape for performing a curling molding process on a tip of a work, wherein the curling molding die is spaced apart before and after the molding die to perform bending in the first and second steps. A curling mold, comprising a bending portion for the second step and a bending portion for the third step for performing the bending step of the third step. 3. The curling molding die according to claim 2, wherein a rotating die is provided below the upper molding die in the bending portion for the first and second steps.