JPH07148545A - Production of mouth piece pin - Google Patents

Abstract

PURPOSE:To make without generating a constricted part on an internal diameter part and an external diameter part, to make without generating cracks on a flange and a work connecting part and to make to hardly generate a deflected center of a penetrated hole. CONSTITUTION:The production consists of a first process which forms a work 9b by drilling a drilled hole with one of punch pins and together forms the top end of the work in taper like, a second process which forms a flange part by stretching the middle real part of the work with a punch and a second punch pin after forming a flange forming space 8 by placing the punch 14 on the flange forming part 11, and a third process which drills the drilled hole of the work further deeper with a third punch pin. Further, it consists of a 4th process which forms the taper part of the work further deeper with a 4th punch pin and together forms a hole on the bottom of the work, a 5th process which forms a fine drilling hole on the lower part of the drilled hole, and a 6th process which penetrates through the hole of the work with the punch pin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a base pin, and its object is to prevent a neck from being formed in an inner diameter portion and an outer diameter portion of a work and to form a crack in a connecting portion between a collar portion and the work. Another object of the present invention is to provide a method for manufacturing a cap pin that does not cause core runout of a through hole.

[0002]

2. Description of the Related Art As a conventional method of manufacturing a die pin, for example, as shown in FIGS. 13 to 15, a solid material (A) cut into a predetermined length is loaded into a die (B). While the outer shape is regulated, the punch (C) is axially press-fitted from one end of the material (A) to form the bottomed hole (D), and the punch (C) is press-fitted to the outer periphery of the material (A). A thick portion (E) (E) protruding outward on the surface is raised along the circumferential direction (see FIG. 13), and then a punch (F) is press-fitted into the bottomed hole (D) to form a bottomed bottom. The depth of the hole (D) is increased to form the material (A) in the shape of a hollow bottomed cylinder (see FIG. 14), and then the thickness is increased with the punch (F) inserted in the bottomed hole (D). The flanges (G) and (G) are formed by pressing the parts (E) and (E) in the axial direction of the material (A) to increase the outer diameter of the thick parts (E) and (E) (see FIG. 15). Then It was those.

[0003]

However, in this conventional manufacturing method, the outer diameter of the thick portion is increased after the thick portion protruding outward of the outer peripheral surface of the material is raised along the circumferential direction. At the very least, the brim is formed. In other words, after pulling the raw material to form the thick portion in the hollow portion (bottomed hole) of the raw material, the thick portion formed by pulling is compressed to form the brim portion. Therefore, tensile and compression fatigue occurs in this material (metal material), and this collar portion is easily broken. Further, since the material is pulled to form the thick portion, and the thick portion formed by the tension is compressed to form the collar portion, the inner diameter portion of the material and the outer diameter portion of the material, Specifically, a neck is formed in the vicinity of the collar, and since this collar is molded in two steps, a crack occurs at the connection between the collar and the material, and this collar or the material easily breaks. Become. Since the bottomed hole is deeply formed in the second step, a thin and long punch pin for drilling is used, and the runout of the hole (bottomed hole) is likely to occur. Moreover, since the collar portion is formed through the two steps, the number of manufacturing steps of the collar portion increases.

In view of the above situation, the inventor of the present invention does not have a constriction in the inner and outer diameters of the work, does not cause a crack in the connecting portion between the collar and the work, and has a runout of the through hole. We continued our earnest research on a method of manufacturing a base pin that is less likely to cause a crack and that can shorten the manufacturing process of the collar portion.

[0005]

That is, the present invention is a method of manufacturing a base pin protruding from a base of a fluorescent lamp or the like, in which one die having holes is loaded with a raw material, and the punch pin is attached to the raw material. The first step of forming a work by punching a hole of a required depth and forming the tip of the work in a tapered shape, and the work in a second die having a hole provided with a collar forming part in the upper part. A second step of forming a collar portion on the work by pulling the solid portion of the work by loading and arranging a punch on the collar forming portion to form a collar forming space, and a hole. The third step of loading a work provided with a collar portion into the three dies having the above, and the third step of drilling the holes of the work more deeply with the three punch pins, and the above-mentioned four dies having a hole provided with a die spin at the bottom. Load the work The fourth step of forming a tapered portion formed at the tip of the work deeper with a punch pin and forming a hole at the bottom of the work by die spin, and loading the work into five dies having holes and A fifth step of forming a thin perforation at the lower part of the perforation by means of five punch pins having a small diameter, and a sixth step of loading the work into a six die having an opening and penetrating the hole of the work with the punch pin. The present invention relates to a method for manufacturing a base pin, comprising:

[0006]

[Operation] The solid portion of the work is pulled by one casting to form the collar portion on the work. Therefore, the manufacturing process of the collar portion can be shortened, the tensile compression fatigue of the metal material can be reduced, and the inner diameter portion of the work, that is, the through hole formed by penetrating the work and the outer portion of the work. There is no constriction in the diameter part. and,
No cracks occur at the connection between the collar and the work.
Furthermore, since deep hole drilling is performed in the required steps (five steps), it is possible to process holes with less runout without using thin and long punch pins.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a method for manufacturing a base pin according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a material used in a method for manufacturing a cap pin according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a state in which the material shown in FIG. 1 is perforated, and FIG. 3 is shown in FIG. 4 is a cross-sectional view showing a state in which the collar portion is provided on the work, FIG. 4 is a cross-sectional view showing a state where the work shown in FIG. 3 is further deeply drilled, and FIG. 5 is formed at the tip of the work shown in FIG. FIG. 6 is a cross-sectional view showing a state in which a tapered portion is formed deeper and a hole is provided at the bottom of the work, FIG. 6 is a cross-sectional view showing a state in which a fine perforation is provided at the lower part of the perforation of the work shown in FIG. 5, and FIG. 7 is shown in FIG. 8 is a sectional view showing a state in which the hole of the work is penetrated, FIG. 8 is a sectional view showing a state in which the hole of the work is further deeply drilled by another third step, and FIG. 9 is a view showing the hole of the work shown in FIG. FIG. 10 is a cross-sectional view showing the state in which the cap pin is made to move, FIG. 10 is a schematic view for explaining the manufacturing process of the base pin, and FIG.
Similar to the schematic diagram for explaining the manufacturing process of the base pin,
FIG. 12 is a schematic view for explaining the manufacturing process of the cap pin, similar to FIG.

(1) is a material of a base pin provided in a state of protruding from a base of a fluorescent lamp or the like, and the material (1) is solid and is made of a copper alloy. The material (1) is cut into a predetermined length in advance. The present invention uses cold forging in which the material (1) is processed at room temperature in each step.

First, in the present invention, the material (1) is loaded into the hole (3) provided in the die (4). The loaded material (1) is the inner diameter of the die (4), that is, the hole (3).
Is held by. As shown in FIG. 10, a vertically moving push-out pin (2) is arranged under the hole (3), and the lower part of the hole (3) is formed in a tapered shape. A punch pin (5) having a tip portion (7) having a diameter smaller than that of the material (1) is press-fitted into the material (1) loaded in the hole (3) to obtain the required depth in the material (1). A hole (6) is drilled to form a work (9a) shown in FIG. In this step, since the lower part of the hole (3) is formed in a tapered shape, the tip of the work (9a) is formed in a tapered shape (hereinafter referred to as a tapered portion (26)). When the punch pin (5) is pressed into the material (1), a gap (2) is formed between the tip (7) of the punch pin (5) and the hole (3).
5) is formed, and the material (1) in this gap (25) is stretched (extruded backward). The work (9a) having the perforations (6) is extruded from the inside of the die (4) by raising the push-out pin (2).

Next, the work (9a) having the perforations (6) is loaded into the holes (12) provided in the die (13). The loaded work (9a) is a die (1
It is held by the inner diameter of 3), ie the hole (12). As shown in FIG. 11, a push-out pin (10) which moves up and down is arranged at the lower part of the hole (12), and a flange forming portion (11) is provided at the upper end of the hole (12). The lower part of () is formed in a tapered shape. A punch (1) is placed on a die (13) provided with a collar forming section (11).
4) is provided to form the flange forming space 8 and then the work 9a is punched by the punch 14 and the punch pin 15.
The solid portion (27) is pulled to form the collar portion (16) on the work (9a) as shown in FIG. 3 (upsetting).
The work (9b) on which the flange portion (16) is formed is extruded from the inside of the die (13) by the ascent of the extrusion pin (10). If a required number of recesses (not shown) are radially provided on the lower portion of the punch (14), the collar (1
It is preferable that an edge-shaped ridge (not shown) for preventing rotation can be formed on the collar portion (16) when the step (6) is formed.

A work (9) on which the collar (16) is formed
b) With another die (not shown) and a punch pin (not shown), the perforation (6) is further deeply drilled as shown in FIG. 4 (rear extrusion process).

The work (9c) in which the perforations (6) are formed deeper is loaded into the holes (18) provided in the die (17). As shown in FIG. 12, a cylindrical pushing sleeve (19) which moves up and down is arranged under the hole (18), and a die spin (20) slidable in the pushing sleeve (19) is provided. ) Is arranged. The tip of the work (9c) loaded in this hole (18), that is, the tapered portion (26) is formed deeper by the punch pin (24), and the work (9) is formed by the die spin (20).
Form a hole (21) at the bottom of c). As shown in FIG. 5, the work (9d) having the hole (21) at the bottom is extruded from the die (17) by the upward movement of the extrusion sleeve (19).

Next, a work (9d) having a hole (21) formed on the bottom is provided with another die (not shown), and a cylindrical pushing sleeve that moves up and down is arranged and the pushing is performed. It is loaded in the hole in which the die spin slidable in the sleeve is arranged. Work (9d) loaded in this hole
Perforations (6) formed in at least the work (9d)
With a punch pin (not shown) having a diameter smaller than the diameter of
Fine perforations (22) at the bottom of the perforations (6) as shown in FIG.
Are formed (backward extrusion). In this process, the die spin is used to lower the work (9d), that is, the hole (2
1) is pressed.

A thin perforation (22) is formed below the perforation (6).
The work (9e) provided with is mounted on an opening having the same shape as the outer shape of the work (9e) provided on another die (not shown). The work (9e) loaded in this opening is punched (forward extruded) through the holes (6), the thin perforations (22) and the holes (21) of the work (9e) with a punch pin (not shown). , A through hole (28) is formed in this work (9e), and a base pin (2) as shown in FIG. 7 is formed.
3) is formed. In this step, the work (9e) is supported by the die.

Further, a punch pin (having a diameter smaller than the inner diameter of the hole (6) formed in the work (9b) and at least the work (9b) in which the collar portion (16) is formed in another die (not shown)). The work (9f) provided with the perforations (29) may be formed (rear extrusion processing) by further perforating the perforations (6) as shown in FIG. 8 (not shown). After forming the perforations (29), the steps described above are performed, that is, the tapered portion (26) of the work (9f) is formed deeper and a hole (not shown) is formed at the bottom of the work (9f). A thin perforation (22) is formed in the lower part of the perforation (29), and a through hole (30) is formed as shown in FIG. By forming in this way, the base pin (31) provided with the through hole (30) having two steps as shown in FIG. 9 can be formed.

These punch pins (5), (1
5), (24), etc. and dice (4), (13), (17)
Etc. are arranged at equal intervals on the same axis.
Further, the works (9a) to (9) formed in the respective shapes by being loaded in the dies (4), (13), (17) and the like.
e) is the die (4), (13), (17)
A transfer mechanism (not shown) waiting on the upper side of each of the next stations (dies (13), (1)
7) etc.).

In this way, the solid part (27) of the work (9a) is pulled by one casting to pull the work (9a).
Since the collar portion (16) is formed on the collar portion, the collar portion (1
6) The manufacturing process can be shortened, the tensile and compression fatigue of the metal material can be reduced, and the penetrating hole formed by penetrating the inner diameter portion of the die pin (23), that is, the work (9e). No constriction occurs in the outer diameter portion of the hole (28) and the work (9e). and,
The solid part (2
Since 7) is pulled to form the collar portion (16) on the work (9a), cracks do not occur at the connecting portion between the collar portion (16) and the work (9a). Furthermore, since deep hole drilling is performed in the required steps (five steps), it is possible to process holes with less runout without using thin and long punch pins.

[0018]

As described above, the present invention is a method of manufacturing a base pin protruding from a base of a fluorescent lamp or the like,
A first step of forming a work by loading a material into one die having a hole and punching a hole of a required depth in the material with a punch pin, and forming the tip of the work into a tapered shape The work is loaded into a second die having a hole provided with a collar forming portion, a punch is arranged on the collar forming portion to form a collar forming space, and then the solid portion of the workpiece is fixed by the punch and the second punch pin. A second step of pulling to form a collar portion on the work, and a third step of loading a workpiece having a collar portion on three dies having holes and further perforating the work with three punch pins. The work is loaded into four dies each having a hole provided with a die spin in the lower part, and the taper portion formed at the tip of the work is further deepened by the four punch pins, and the bottom of the work is formed by the die spin. A fourth step of forming a hole in the hole, a fifth step of loading the work into a die having five holes and forming a thin hole at the bottom of the hole with five punch pins having a diameter at least smaller than the diameter of the hole, and the opening A method of manufacturing a die pin, which comprises a sixth step in which the work is loaded into a six die having parts and the hole of the work is penetrated by a punch pin, so that the following effects are obtained.

That is, since the solid portion of the work is pulled by one casting to form the collar portion on the work, the manufacturing process of the collar portion can be shortened, and the metal material can be tension-compressed. You can reduce fatigue and
The inner diameter portion of the work, that is, the through hole formed by penetrating the work and the outer diameter portion of the work are not constricted. Moreover, since the solid portion of the work is pulled by one casting to form the flange portion on the work, cracks do not occur at the connection portion between the flange portion and the work. Furthermore, since deep hole drilling is performed in the required steps (five steps), it is possible to process holes with less runout without using thin and long punch pins.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a material used in a method for manufacturing a base pin according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which perforations are provided in the material shown in FIG.

3 is a cross-sectional view showing a state in which a collar portion is provided on the work shown in FIG.

FIG. 4 is a cross-sectional view showing a state in which the work shown in FIG. 3 is further perforated.

5 is a cross-sectional view showing a state in which a tapered portion formed at the tip of the work shown in FIG. 4 is formed deeper and a hole is provided at the bottom of the work.

6 is a cross-sectional view showing a state in which a thin perforation is provided in the lower part of the perforation of the work shown in FIG.

7 is a cross-sectional view showing a state where a hole of the work shown in FIG. 6 is penetrated.

FIG. 8 is a cross-sectional view showing a state in which the work is perforated further deeply by another third step.

9 is a cross-sectional view showing a state in which a hole of the work shown in FIG. 8 is penetrated.

FIG. 10 is a schematic view for explaining a manufacturing process of the base pin.

FIG. 11 is a schematic view for explaining the manufacturing process of the cap pin, similar to FIG.

FIG. 12 is a schematic view for explaining the manufacturing process of the cap pin, similar to FIG.

FIG. 13 is a schematic view for explaining a conventional manufacturing process of a base pin.

FIG. 14 is a schematic view for explaining the conventional manufacturing process of the spinneret pin, similar to FIG.

FIG. 15 is a schematic view for explaining the conventional manufacturing process of the spinneret pin, similar to FIG.

[Explanation of symbols]

 1 Material 3 Hole 4 Die 5 Punch Pin 6 Punch 7 Tip Part 8 Collar Forming Space 9a Work 9b Work 9c Work 9d Work 9e Work 11 Collar Forming Part 12 Hole 13 Die 14 Punch 15 Punch Pin 16 Clasp Part 17 20 Die 18 Hole 22 Thin Perforation 23 Base Pin 24 Punch Pin 25 Gap 26 Tapered Part 27 Solid Part 29 Perforation 30 Through Hole 31 Base Pin

Claims (2)

[Claims] 1. A method of manufacturing a base pin projecting from a base of a fluorescent lamp or the like, wherein a material having a hole is loaded into a die, and a punch pin having a required depth is drilled in the material. To form a work and form the tip of the work into a taper shape, and to load the work into a second die having a hole in which a flange forming portion is provided in the upper part and punch a punch on the flange forming portion. The second step of forming a collar portion on the workpiece by pulling the solid portion of the workpiece by the punch and the second punch pin after forming the collar forming space, and the collar portion on the third die having holes. The third step of loading the provided work and punching the hole of the work further deeply with the three punch pins, and loading the work into four dies having a hole provided with a die spin in the lower part, and using the four punch pins Formed at the tip of the work Fourth step of forming the tapered portion further deeply and forming a hole in the bottom of the work by die spin, and loading the work in five dies having holes and punching with five punch pins having a diameter at least smaller than the diameter of the punch Die pin comprising a fifth step of forming thin perforations in the lower part of the base and a sixth step of loading the work into a six die having an opening and penetrating the hole of the work with a punch pin. Manufacturing method. 2. The die according to claim 1, wherein the third step is further deeply drilled by three punch pins having a diameter smaller than the inner diameter of the hole formed in the work in the first step. Pin manufacturing method.