JPH0852598A - Forward progressive die - Google Patents

Abstract

PURPOSE:To eliminate mixing of defective products without damaging a pilot pin by providing a positioning device, by which the tip end of a hoop material is positioned at a position apart by specific distance in the direction of a second stage punching die from the center of a pilot punch, and thereby positioning the hoop material in the early stage of working. CONSTITUTION:Assuming the length of a first die pitch is (p), diameter of a pilot pin 21a is (d), and a safety margin is a the length L between the side on the pilot punch 11a side of a stopper 92 and the center of the pilot punch 11a is shown in the expression I. The tip end 82 of a hoop material 8 is brought against the stopper 92 thus provided, and the positioning is made near the pilot pin 21a; therefore, the pilot pin 21a is prevented from working in a condition without a pilot hole 81a, and consequently the pilot pin 21a is not damaged. In addition, since the length of the hoop 8 that is worked by each punching die initially is the length of the first die pitch, the possibility of producing a defective product is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a progressive die for processing a hoop material, which is a material for processing a long thin steel plate, and more particularly to one having an initial positioning function for the hoop material.

[0002]

2. Description of the Related Art Conventionally, a progressive type has been constructed such that a plurality of processing steps are sequentially performed in the material flow direction. For example, in the case of a 4-stage progressive die, as shown in FIGS. 3 (a) and 3 (b), the first-stage die 1 and the second-stage die 1 which process different shapes with a die pitch p equidistant A die 2, a third die 3, and a fourth die 4 are sequentially arranged. The first-stage punching die 1 is provided with a first-stage punch 11 and a first-stage die 12 corresponding to the upper and lower sides, and a pilot punch 11
a and a pilot die 12a corresponding to the pilot punch 11a are provided. The second-stage punching die 2 is provided with a second-stage punch 21 and a second-stage die 22 corresponding to the upper and lower sides as in the first stage, and instead of the pilot punch 11a and the pilot die 12a, the die from the pilot punch 11a is used. Pilot pins 21a are provided at positions separated by the pitch p. Similar to the second step cutting die, the third step cutting die 3 and the fourth step cutting die 4 are provided with punches and dies respectively corresponding to the upper and lower sides and pilot pins are provided. The punches of the punching die of each stage are fixed to the punch plate 5 so as to reciprocate up and down. The die of each stage is fixed to the bolster plate 6. 7 is a stripper plate. When the hoop material is continuously processed, the hoop material 8 is fed from the first step cutting die 1 side of the progressive feed type,
The pilot punch 11a of the first-stage punching die 1 is used to machine the pilot hole 81a, and the first-stage punch 11 is used to machine the first process portion 81. Next, the hoop material 8 is fed by the feeding device (not shown) by the 1st die pitch p, and the pilot pin 21a is inserted into the pilot hole 81a machined in the first stage by the second stage punching die 2 and positioned. ,
The second punching die 2 is machined with reference to the pilot hole 81a. Similarly, in the processing of the third step and the fourth step, the hoop material 8 is positioned with reference to the pilot hole 81a and the third step cutting die 3 and the fourth step cutting die 4 are processed.

[0003]

However, in the prior art, when the hoop material 8 is first inserted into the first step cutting die 1,
Since the pilot hole 81a is not machined, the position of the tip portion 82 of the hoop material 8 cannot be determined. Therefore, FIG.
As shown by the alternate long and short dash line in (a) and (b), the length from the tip portion 82 of the hoop member 8 to the pilot punch 11a is
If the pitch is longer than the first die pitch p, the vicinity of the tip of the hoop material 8 is caught by the pilot pin 21a of the second step die 2, and if the first step die 1 is processed as it is, the second step die 21 The pilot pin 21a will be damaged.
Further, as shown in FIG. 3C, the tip portion 8 of the hoop material 8 is
If the length from 2 to the pilot punch 11a is short, as shown by the alternate long and short dash line during processing after the second step punching die,
There was a defect that the hoop material 8 was not present in the processing range, and a perfect shape was not formed, that is, one so-called defective product was mixed. It is an object of the present invention to provide a progressive die in which the position of the hoop material at the initial stage of processing is determined, the pilot pin is not damaged, and defective products are not mixed.

[0004]

In order to solve the above problems, the present invention provides a die for processing a plurality of different shapes arranged at a die pitch interval, and a first die among the plurality of die.
A pilot punch and a pilot die provided in the die for the second stage, and pilot pins for the die after the second stage provided at positions separated from the pilot punch by every one die pitch are provided. A progressive die that sequentially processes the hoop material fed from the punch die, where the length of the die pitch is p, the diameter of the pilot pin is d, and the safety margin is α, the second punch die from the center of the pilot punch. In the position away from the hoop member by a predetermined length L, L = p- (d / 2) -α and a positioning device for determining the position of the tip of the hoop member is provided.

[0005]

With the above means, the tip of the hoop material is first abutted against the positioning device and positioned in the vicinity of the pilot pin, so that the pilot pin is not machined without a pilot hole. It will not be damaged. Further, since the length of the hoop that is first processed by each punching die is the length of one die pitch, it can be said that the tip of the hoop material enters the processing range of each process part and produces a defective product. Disappear.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a plan view, and its constitution is almost the same as that of FIG. 3 for explaining the conventional example. To do. The difference from the conventional example is that the tip end portion 82 of the hoop member 8 is provided in the vicinity of the pilot pin 21a of the second step punching die 2 provided at a position separated from the pilot punch 11a of the first step punching die 1 by one die pitch p. The point is that a positioning device is provided to determine the position. In the figure, 9 is a cylinder fixed near both sides of the pilot pins 21a at a position where it does not interfere with the machining operation of the first punching die 1, 91 is a rod reciprocating by the cylinder 9, and 92 is a stopper provided on the rod 91. Thus, a positioning device that determines the position of the tip end portion 82 of the hoop member 8 is configured. The length L between the side surface of the stopper 92 on the pilot punch 11a side and the center of the pilot punch 11a is L = p- (d / 2) -α when the diameter of the pilot pin 21a is d. α is a safety margin of about 1 to 2 mm for preventing the pilot pin 21a from coming into contact with the tip portion 82 of the hoop member 8.

Now, the operation of positioning the tip portion 82 of the hoop member 8 will be described. First, the cylinder 9 pushes the stopper 92 from the position shown by the alternate long and short dash line in FIG. 2 to the position shown by the solid line that does not interfere with the pilot pin 21a, and hits the tip 82 of the hoop member 8 that is sent. . Next, the hoop material 8 is fed from the pilot punch 11a side by a feeding device (not shown), and the tip 8
2 is butted against the stopper 92. In this state, the punch plate 5 is lowered, and the pilot hole 8
The 1st process part 81 containing 1a is processed. Next, the punch plate 5 is raised and the stopper 92 is pulled down by the cylinder 9 to the original position where it does not interfere with the hoop material 8. Next, the hoop material 8 is fed in the direction of the second step by the 1-inch pitch p, the punch plate 5 is lowered, the pilot pin 21a is inserted into the pilot hole 81a to position the hoop material 8, and the second step is performed. Process the die. At the same time, in the first punching die 1, the first hole including the pilot hole 81a
The process part 81 is processed. Next, the third step cutting die 3 and the fourth step cutting die 4 are successively processed successively. As described above, since the tip of the hoop member 8 is first positioned near the pilot pin 21a, the pilot pin 21a is not machined without the pilot hole 81a, and therefore the pilot pin is not damaged. . In addition, the tip of the hoop material 8 does not enter the processing range of each process section to produce a defective product. It should be noted that although in the above-described embodiment, the progressive feed type having four stages has been described, the number of stages is not limited to four.

[0008]

As described above, according to the present invention, since the tip of the hoop material is positioned near the pilot pin at the beginning of the working process, a defective product may occur on the first sheet. Without damaging the pilot pin,
It is effective in providing a safe progressive type.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3A is a side sectional view showing a conventional example, FIG.
(C) It is a top view.

[Explanation of symbols]

1 1st-stage punching die, 11 1st-stage punching, 11a pilot punch, 12 1st-stage die, 12a pilot die, 2 2nd-stage punching die, 21 2nd-stage punching, 21
a Pilot pin, 22 2nd stage die, 3 3rd stage punching die, 4 4th stage punching die, 5 punch plate, 6 bolster plate, 7 stripper, 8 hoop material, 81
1st process part, 81a pilot hole, 82 tip part,
9 cylinders, 91 rods, 92 stoppers

Claims (1)

[Claims] 1. A cutting die for processing different shapes in a plurality of stages arranged at a pitch of one die, a pilot punch and a pilot die provided in the first-stage cutting die among the plurality of cutting dies, and the pilot. A progressive feed die that includes a pilot pin of a die for the second and subsequent stages, which is provided at a position spaced apart from the punch by one die pitch, and sequentially processes the hoop material fed from the die for the first stage. Where p is the length of the pilot pin, d is the safety allowance, and α is the safety margin, the position is a predetermined length L away from the center of the pilot punch in the direction of the second punching die, where L = p- (d / 2) -α, provided with a positioning device for determining the position of the tip of the hoop material.