JP3298656B2 - Hole punching die positioning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching die positioning device, for example, a punching die for determining the position of a workpiece on a press die when punching the workpiece with a press die or the like. The present invention relates to a mold positioning device.

[0002]

2. Description of the Related Art In general, there is a punching die shown in FIG. 3 for forming a hole in a processed product 1A with a press die or the like. The punching die 1 is a flat upper and lower pressing die 2,
3, a columnar post 4 is fixed to the lower press die 3,
A sleeve 5 fitted to the post 4 is fixed to the upper press die 2, and the post 4 slides inside the sleeve 5 as the upper press die 2 moves up and down. A die plate 6 is provided on the lower press die 3, and a punch 7 is press-fitted and held in the plate 8 so as to face the die 6 </ b> A of the die plate 6, and is fixed to the upper press die 2. Reference numeral 9 denotes a guide plate. The guide plate 9 guides the punch 7 and is provided on the die plate 6 side so as to be urged by a spring 9A so that the processed product 1A after punching is removed from the punch 7. It is energizing.

[0003]

However, in such a conventional hole punching die 1, the punch 7 and the die 6A are not provided.
, That is, the relative position between the upper press die 2 and the lower press die 3 is determined by the play in the state where the post 4 and the sleeve 5 are fitted and the fall of the post 4 and the sleeve 5. The closer the backlash is to zero and the closer to zero the fall, the more accurately the relative position between the post 4 and the sleeve 5 is determined. However, it is very difficult to manufacture the relative positions of the post 4 and the sleeve 5 with high accuracy and close to zero error, and a small amount of play is required to make the sleeve 5 movable with respect to the post 4. Is necessary. Therefore, the upper press die 2 and the lower press die 4
There is a problem that positioning with high precision cannot be performed.

In the above-described configuration, even if a guide pin for positioning the workpiece 1A is provided on the lower press die 3 and the workpiece 1A is accurately positioned on the lower press die 3,
Since high-precision positioning between the lower press die 3 and the upper press die 2 cannot be performed, high-precision hole punching by the punch 7 on the upper press die 2 cannot be performed. Further, in the above-described hole punching die 1, a columnar pilot is provided on the upper press die 2 side, and the pilot of the upper press die 2 side is inserted into a reference hole (not shown) of the workpiece 1 </ b> A on the lower press die 3. Even if the upper press die 2 is positioned with respect to the reference hole of the processed product 1A, if the position of the pilot on the upper press die 2 drops without being determined, the tip of the pilot is processed. Deflected from the reference hole of product 1A, processed product 1A
Around the reference hole. There is a problem that the processed product 1A is greatly deformed depending on the hole punching die 1 for heavy objects.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem. A movable bush is provided on a lower press die. The inner part of the bush is guided by the pilot to guide the inner and outer surfaces of the inner hole of the bush. Is always stable and can be obtained with high precision.

Further, by forming an oil groove on the inner peripheral surface of the inner hole of the bush to be fitted to the pilot, the positioning operation can be made smoother, and the bush can be moved horizontally in the lower press die. Accordingly, it is an object of the present invention to provide a hole punching die positioning device capable of positioning a hole punching position more smoothly and accurately.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a punching die positioning apparatus for punching a workpiece positioned and inserted between a punch and a die. A first press die and a second press die, the punch being held by a first press die holding the punch, having a smaller diameter than the reference hole on the same axis as the reference hole of the workpiece; Two columnar pilots protruding from the tip of the punch to the second press die side and loosely fitted and held in the second press die holding the die, and face the pilot and fit the pilot. A bush having an inner hole, protruding from the surface of the second press die toward the first press die side, and having a protruding portion that fits into a reference hole of the workpiece, and a biasing member for the first press die And the second pump A guide plate having a concave relief deeper than the protrusion amount of the bushing protrusion on the front side of the die, and urged movably from the tip of the punch toward the second press die. It is characterized by having.

[0008] The present invention is characterized in that the bush has an oil groove on an inner peripheral surface of an inner hole fitted with the pilot. In the present invention, the bushing is characterized in that it is held horizontally movable on the second press die.

[0009]

According to the present invention, since the first press die holding the punch and the pilot and the second press die having the die and the bush to be loosely fitted are provided, the first press die is the second press die. When approaching the mold, the tips of the two pilots are inserted into the inner holes of the protruding portions of the bush, respectively. If there is a deviation in the relative position between the pilot and the bush, the bush that fits into the reference hole of the workpiece moves in the second press die together with the workpiece, and when the pilot fits on the inner peripheral surface in the inner hole, The pilot coincides with the axis of the processing reference hole of the processed product, and the positioning of the processed product is performed with high accuracy.

In the present invention, since the oil groove is provided on the inner peripheral surface of the inner hole of the bush, the fitting between the inner hole of the bush, the tip and the intermediate portion of the pilot is smooth. In the present invention, the bush is held by the second press die so as to be horizontally movable. Therefore, even if the position of the bush is displaced from the tip of the pilot, the bush moves horizontally by the approach and insertion of the pilot, and the bush is fitted. I do.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a first embodiment of a positioning device for a punching die according to the present invention . First, the configuration will be described. FIG.
1A and 1B, reference numeral 10 denotes a punching die, and reference numeral 11 denotes a positioning device for the punching die provided in the punching die 10. The punching die 10 has a processing reference hole 12 as shown in FIG.
This is an apparatus for performing a hole punching process at a predetermined drilling position 13a with respect to a processing reference hole 12 in a processed product 13 having a hole.

In FIG. 1A, a punching die 10 is an upper die 15 which is a first pressing die which is disposed to face each other up and down.
And a lower die 16 as a second press die. Lower mold
16 is fixed to a base (not shown), and the upper die 15 is held so as to be able to approach and separate from the lower die 16. For example, as shown in FIG. 3, two posts 4 are fixed to the lower die 16 and a sleeve 5 fitted to the post is fixed to the upper die 15.

The upper die 15 has a press-fitting plate 15B into which a columnar punch 17 is press-fitted downward, and is fixed integrally with the press-fitting plate 15B above the press-fitting plate 15B. Receiving plate 15A
And holds the punch 17. 18 is a pilot, the pilot 18 is at a predetermined position with respect to the punch 17,
Further, the workpiece 13 is press-fitted into the press-fitting plate 15B on the same axis as the two processing reference holes 12, and is held by the pressure-receiving plate 15A. Only one is shown in the figure. The pilot 18 has a diameter smaller than the diameter of the processing reference hole 12 of the processed product 13, and
It is a long columnar body that has a guide portion 18a that protrudes below the tip of the punch 17 and below the lower surface of a guide plate 19, which will be described later, and whose diameter decreases toward the front side. The positional relationship between the pilot 18 and the punch 17 is determined by a jig borer, and the hole position accuracy of the punch 17 is set to ± 0.002 mm or less.

A guide plate 19 is provided between the upper die 15 and the lower die 16 near the tip of the punch 17 for guiding the tip of the punch 17 and the intermediate portion of the pilot 18.
The guide plate 19 is a support column not shown, for example,
The pressure receiving plate 15 supported by the post 4 shown in FIG.
One end 20a is provided between A and the press-fit plate 15B, and one end 20a is held by the tip 20b of the spring 20 held by the press-fit plate 15B, and can be moved up and down. When the guide plate 19 is held below the upper die 15 by the spring 20 and is at the standby position, the tip of the punch 17 is set so as to be in the guide hole 19 b of the guide plate 19.

The lower mold 16 includes a fixing plate 16E fixed to a base (not shown), and a die plate 16D fixed to the fixing plate 16E on the fixing plate 16E and having a die 22 at a position corresponding to the punch 17. Have. Reference numeral 23 denotes a bush. The bush 23 is loosely fitted on the upper surface of the fixed plate 16E in a convex space 16a provided at a position facing the pilot 18 of the die plate 16D holding the die 22 so as to be able to move horizontally. Has been held. The inner diameter of the space 16a is formed larger than the outer diameter of the bush 23 by 0.03 mm to 0.05 mm. The bush 23 has an inner hole 23a that fits into the pilot 18, protrudes from the upper end 22a of the die 22 toward the upper die 15, and has a protrusion 23b that fits into the processing reference hole 12 of the processed product 13. ing. A chamfer 23c is formed at the upper end of the protruding portion 23b so that the machining reference hole 12 can be easily inserted, and a spiral oil groove 25 is formed on the inner peripheral surface of the inner hole 23a.

As shown in FIGS. 1 and 2, the guide plate 19 is provided on the front side of the lower die 16 at a position facing the protrusion 13b of the bush 23 when the upper die 15 approaches the lower die 16. It has a concave relief 19a that is deeper than the projection of the projection 23b. Reference numeral 24 denotes a guide ring. The guide ring 24 is fixed to the guide plate 19 and is fitted to the pilot 18 to guide the pilot 18.

Next, the operation will be described. Hole punching mold 10
The upper die 15 holds the punch 17 and holds the two pilots 18, and has an inner hole that fits the pilot 18, and a protruding projection that fits into the processing reference hole 12 of the processed product 13. And a lower die 16 that holds the die 22 while the bush 23 is loosely fitted, so that when the processed product 13 is placed on the lower die 16, the processed Type 16
Is inserted along the chamfer 23c of the projecting portion 23b of the bush 23 projecting upward from the surface of the bush 23, and smoothly fits into the projecting portion 23b.

Next, when the upper die 15 approaches the lower die 16, the tip of the guide portion 18a of the pilot 18 approaches the inner hole 23a of the protruding portion 23b of the portion 23, and is slightly inserted into the inner hole 23a. If the upper die 15 holding the pilot 18 and the lower die 16 holding the bush 23 are misaligned, the bush 23 is loosely fitted in the space 16a of the die plate 16D.
23 moves in the space 16a. Bush 23 is fixed plate
The bush is held so that it can move horizontally on the 16E.
The movement of 23 moves the upper surface of the fixed plate 16E horizontally and smoothly by the amount of the aforementioned displacement. The upper die 15 further approaches the lower die 16, and the intermediate portion 18 b of the pilot 18 is further inserted into the inner hole 23 a and fitted to the inner peripheral surface in the inner hole 23 a. Since an oil groove 25 is provided on the inner peripheral surface, the pilot 18
Fits smoothly into 23a. Middle part 18b of pilot 18
Is fitted into the inner hole 23a, the pilot 18 coincides with the axis of the processing reference hole 12 of the processed product 13, and the positioning of the processed product 13 is performed with high accuracy. For this reason, the tip of the punch 17 held integrally with the pilot 18 is positioned at a predetermined drilling position 13a of the workpiece 13.
Matches with high precision.

When the upper die 15 further approaches the lower die 16, the pilot 18 is smoothly and deeply inserted into the drilling position 13a, and the lower surface of the guide plate 19 is brought into contact with the surface of the workpiece 13 as shown in FIG. Is pressed and fixed by the compression force of the spring 20, the tip of the punch 17 projects from the lower surface of the guide plate 19, and a punching position 13 a of the workpiece 13 is punched with the die 22. At this time, the lower mold of the guide plate 19
Since the relief 19a is provided on the front side on the 16 side, the protrusion 23b of the bush 23 enters the relief 19a, and the protrusion 23b does not hit the guide plate 19.

After processing, when the upper die 15 separates from the lower die 16 and rises, the tip of the punch 17 leaves the upper end 22a of the die 22 and returns to the guide hole 19b of the guide plate 19, and the processed product 13
, The workpiece 13 is left on the lower die 16 and the boring of the workpiece 13 ends. In the above-described embodiment,
Although the case where the upper mold 15 approaches the lower mold 16 has been described, the present invention is not limited to this embodiment, and the upper mold 15 is fixed, and the lower mold 16 is fixed.
16 may move upward. Also, the upper mold 15 and the lower mold 16 may of course move horizontally instead of vertically. Further, the pilot 18 may be held by a fixed-side press die.

[0021]

As described above, according to the present invention,
A movable bush is provided on the lower press die, and for the processed product, the outer periphery of the projecting portion of this bush is fitted to the inner diameter of the reference hole of the processed product, and the pilot is used to fit the inner peripheral surface of the inner hole of the bush with a pilot. By guiding, the position of the processed product is prevented from being displaced due to backlash caused by the post and the sleeve that guide the upper and lower press dies, and the positioning of the processed product is always stable and high accuracy can be obtained.

Further, according to the present invention, the positioning operation can be performed more smoothly by forming the oil groove on the inner peripheral surface of the inner hole of the bush fitted with the pilot. Further, according to the present invention, the bush can be moved horizontally in the lower press die, so that the hole through position of the processed product can be positioned smoothly and accurately.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an embodiment of a positioning device for a punching die according to the present invention, in which (a) is a sectional view of a main part thereof, and (b) is a plan view of the processed product before processing.

FIG. 2 is a cross-sectional view of a principal part showing the operation of the positioning device for a punching die shown in FIG.

FIG. 3 is a schematic cross-sectional view showing a conventional hole punching die positioning apparatus.

[Explanation of symbols]

 10 Hole punching die 11 Hole punching die positioning device 12 Processing reference hole 13 Processed product 15 Upper die (first press die) 16 Lower die (second press die) 17 Punch 18 Pilot 20 Spring (biasing member) ) 22 Die 23 Bush 25 Oil groove

Claims (3)

(57) [Claims] 1. A punching die positioning device for punching a workpiece positioned and inserted between a punch and a die, wherein the first device is disposed to face each other and can be approached and separated from each other.
A press die and a second press die, held by the first press die holding the punch, having a smaller diameter than the reference hole on the same axis as the reference hole of the workpiece, Two columnar pilots protruding from the tip to the second press die side, and an inner hole that is loosely fitted and held in the second press die holding the die, and is opposed to the pilot and fitted to the pilot. A bush having a protrusion protruding from the surface of the second press die toward the first press die side and fitting into a reference hole of the processed product; and a biasing member interposed between the bush and the first press die. And a concave relief deeper than the protrusion of the projecting portion of the bush is provided on the front portion of the second press mold side so as to movably move from the tip of the punch toward the second press mold side. and a is a guide plate, the bushing is the pie A positioning device for a punching die, wherein an oil groove is provided on an inner peripheral surface of an inner hole fitted to a lot. 2. The apparatus according to claim 1, wherein said bush is held by said second press die so as to be movable horizontally. 3. A positioning device of a punching die for punching a workpiece positioned and inserted between a punch and a die, wherein said first positioning device is disposed so as to face each other and can be approached and separated from each other.
A press die and a second press die, held by the first press die holding the punch, having a smaller diameter than the reference hole on the same axis as the reference hole of the workpiece, Two columnar pilots protruding from the tip to the second press die side, and an inner hole that is loosely fitted and held in the second press die holding the die, and is opposed to the pilot and fitted to the pilot. A bush having a protrusion protruding from the surface of the second press die toward the first press die side and fitting into a reference hole of the processed product; and a biasing member interposed between the bush and the first press die. And a concave relief deeper than the protrusion of the projecting portion of the bush is provided on the front portion of the second press mold side so as to movably move from the tip of the punch toward the second press mold side. and a is a guide plate, the bushing is the second A hole punching die positioning device, which is held by a press die so as to be horizontally movable.