JP2002059238A - Forging apparatus and method for producing metallic part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a hollow part of metallic parts having the hollow part, such as faucet metal tool, in a forging process. SOLUTION: A production method of the metallic parts has at least a process, in which an upper punch is pushed against a blank laid on a space surrounded with dies dividable into plural pieces and a lower punch disposed at the faced position to the upper punch and having a lower punch guide, is retreated against the pushing force of the upper punch to form a deep hole, and a process, in which the retreat of the lower punch guide is regulated and the partition between the upper punch and the lower punch is punched out with the upper punch and the lower punch guides.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging apparatus and a method for manufacturing a metal part using the same.

[0002]

2. Description of the Related Art For example, FIG. 1 shows a faucet fitting, and a faucet fitting body 1 having a relatively long water passage space therein.
Is manufactured by casting or hot forging, but the casting has poor surface conditions, causes defects such as pinholes, has a poor product yield, and surface finishing is inevitable even for good products. Accordingly, the present applicant has disclosed in Japanese Patent Application Laid-Open No. 10-243.
As No. 41, we propose a faucet fitting using forging, which has excellent points such as excellent surface condition and can have a complicated appearance, but as a surplus part formed by forging There was room for improvement in removing the partition walls. In addition, 3 is a connection part on the piping side, and 4 is a spout connection part. In addition, there are knobs for water volume adjustment on the left and right of the main unit
5 and a temperature control knob 6 are provided.

[0003]

SUMMARY OF THE INVENTION The present invention has been made based on the above problems, and has a mold that can be divided into a plurality of molds.
An upper punch that can move forward and backward toward a space surrounded by these molds, and a position facing the upper punch,
A lower punch capable of moving forward and backward and a lower punch guide for guiding the lower punch are arranged, and the lower punch guide retreats together with the lower punch against the pressing force of the upper punch, and engages with a part of the mold. The forging device is characterized in that only the lower punch guide is restricted from retreating, and the upper punch is movably arranged until the upper punch is positioned in the lower punch guide restricted from retreating.

According to the present invention, the lower punch guide and the lower punch retreat against the pressing force of the upper punch, whereby the material can be formed into a deep hole in the hollow portion while being extruded backward by the upper punch. After the formation of the deep hole is completed, the partition wall of the material between the upper punch and the lower punch is removed by a shearing force between the upper punch and the lower punch guide end face to form a through hole,
A molded article having a deep hole hollow portion can be manufactured.

[0005] A forging apparatus is provided with cooling means such as air blowing for cooling a position near the space side of the lower punch guide where the lower punch guide is restricted from retreating.

By cooling the above-mentioned partition walls to the brittle region by the cooling means, the removal of the partition walls by the punch can prevent the generation of burrs as much as possible, and the partition walls can be easily removed.

Further, the upper punch is pressed toward a material placed in a space surrounded by a mold that can be divided into a plurality of dies, and is disposed at a position facing the upper punch against the pressing force of the upper punch. A step of forming a deep hole by retreating a lower punch having a lower punch guide, a step of restricting retraction of the lower punch guide, and a step of punching a partition between the upper punch and the lower punch by the upper punch with the lower punch guide. It is a method for producing at least a metal component.

In addition, the upper punch is pressed toward a material placed in a space surrounded by a mold that can be divided into a plurality of dies, and is disposed at a position facing the upper punch against the pressing force of the upper punch. A step in which the lower punch having the lower punch guide is retracted to form a deep hole; a step in which the lower punch guide is restricted from retreating; and a step in which the partition wall between the upper punch tip surface and the lower punch end surface is cooled to a brittle region; A step of punching a partition wall between an upper punch and a lower punch by a lower punch guide.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 2 shows a completed product of the body of the faucet fitting by forging according to the present invention, which can be formed from a rod-shaped material in a single forging operation.
12, Spout connection part mixed water passage 13, Spout connection part mounting screw 14, Shower connection part mixed water passage 15, Water amount and temperature adjustment cartridge mounting part 16 are removed by cutting to finish the faucet fitting main body of Fig. 4. be able to. According to this forging method, the post-processing load (cutting load) can be greatly reduced as compared with the conventional forging method, and the material yield can be improved.

Next, the structure of the forging device for the faucet fitting body will be described with reference to FIG. The faucet fitting main body forging apparatus includes a fixed main body frame 21, a lower die 22 provided on the main body frame, a lower punch 23 which can be raised and lowered by a hydraulic cylinder A (not shown), and a lower punch between the lower die and the lower punch. Guide 24, lower punch guide lowering bolt 25 fixed to lower punch guide through a part of lower punch
A side punch A126, a side punch A227, a side punch B28 provided on the lower die, an upper slider 29 facing the lower die, an upper die B30 provided on the upper slider,
It has an upper die A 31, an upper die A guide 32, and an upper punch 33 which can be raised and lowered by a hydraulic cylinder B (not shown).

The outer diameter of the upper punch and the inner diameter of the lower punch guide have an appropriate clearance. As described later, punching a part (partition) of the material remaining between the upper punch, the lower punch, and the lower punch guide during molding. Can be. The lower die has a cooling air inlet 34, a cooling groove 35, and a cooling air outlet 36, and can cool the material near the punching point, and the material of the partition reaches the brittle temperature range by cooling, and is easily punched. Becomes possible.

The upper slider is a hydraulic cylinder C (not shown).
(Main) and can move up and down.
The upper die A is divided (to four parts) for product release, guided by the upper die A guide, and the upper die B
The upper die A is divided in a state where the upper slider is lowered and the mold is clamped.
Combine to form an integral cavity.

The side punch A1 and the side punch B are connected to hydraulic cylinders D and E (not shown), respectively, and are movable left and right. The side punch A2 is freely movable left and right on the same axis as the side punch A1.
Thus, in the initial state, it is located near the left end of the side punch A1.

The heating of the mold is performed by a belt heater 38 attached to the outer periphery of each of the lower die and the upper die.
The temperature is controlled by a thermocouple and a temperature controller (not shown). The outer periphery of the belt-shaped heater is covered with a heat insulating material 39, and a heat insulating plate 40 is interposed between the main body frame and the lower die, and between the upper slider and the upper die, respectively, so that the heat is adiabatically kept. The upper punch and the lower punch are each heated by a heater 41 mounted inside, and the temperature is controlled by a thermocouple and a temperature controller (not shown).

Next, the operation and the forging method will be described with reference to FIGS.

First, the upper dies 30, 31 and the lower dies 22
Then, the respective punches 23, 26, 27, 28, 33 are heated to an appropriate temperature, and the respective punches 23, 26, 2, 2
7, 28, and 33 are arranged as shown in FIG. 6, the material M heated to an appropriate temperature is placed on the lower punch 23, and the upper die B3 is placed.
0 is lowered and the mold is clamped. At this time, upper die A30
Is pressed into the upper die B30 along the tapered portion simultaneously with the contact with the lower die 22 to form an integral cavity.

Next, as shown in FIG. 7, the lower punch 23 and the lower punch guide 24 are raised, and the side punch B 28
The material is stretched into the cavity at the tip and the shower connection
Perform molding of 2. Next, with the lower punch 23 and the lower punch guide 24 raised, the upper punch 33 is lowered, and as shown in FIG. 8, the material is extended into the cavity at the tip of the side punch A 127, and the piping side connection portion 3, Spout connection
At the same time as 4 is filled with the material, the power of the lower punch 23 is slightly reduced. At this time, the side punch A 228 retreats against the stretching force of the material M to form an appearance of the final product.

Subsequently, as shown in FIG. 9, the power of the upper punch 33 is further increased, and the lower punch 2 is pressed against the pressing force.
3 is lowered to complete the material filling of the product section.
At this time, the lower punch guide 24 also retreats integrally with the lower punch 23.

Lower punch guide 2 retreating as a unit
4 is restricted from being retracted by engaging a part of the mold, but the lower punch 23 can be further retracted. At the time when the lower punch guide 24 is engaged, that is, when the formation of the deep hole is completed, cooling air is supplied from the cooling air inlet 34 to cool a part of the lower die 22 near the cooling groove 35, and The material between the lower punch 33 and the lower punch 23 and the lower punch guide 24 is made brittle. The air that has passed through the cooling groove 35 is discharged from the cooling air outlet 36 to the outside of the mold.

Further, as shown in FIG.
Is lowered, the lower punch guide 24
a is engaged with the heat insulating plate 40 and the retraction is restricted, so that only the lower punch 23 is lowered, and the material M between the upper punch 33 and the lower punch 23 is sheared by the upper punch 33 and the lower punch guide 24. It is punched out by force and the molding is completed.
Note that the lower punch guide 24 may be formed to have a slight taper so that a shearing force easily acts.

Next, as shown in FIG.
3. The side punches A127 and B28 are respectively retracted.

Next, as shown in FIG.
0 is raised and the mold is opened. At this time, upper die A3
Although 1 attempts to remain on the lower die 22 by its own weight, it is guided along the taper by the upper die A guide 32 provided on the upper die B30, so that it opens laterally and the upper half of the product is released. The upper die A guide 32
Is caught by the upper die A31 at a certain position, and the upper die A
31 has a structure which does not fall.

Finally, as shown in FIG. 13, the lower punch 23 and the lower punch guide 24 are raised with the mold open, and the removal of all the products is completed. At this time, a part (partition) of the previously punched material is lightly engaged with the product again, and is discharged out of the mold at the same time as the product is taken out.

The obtained molded product is processed as described above to obtain a final product.

[0026]

According to the present invention, since a metal part having a communicating hollow portion can be manufactured in a series of processing steps, the number of post-processes can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a metal part formed by the present invention.

FIG. 2 is a diagram showing an example of a molded product molded according to the present invention.

FIG. 3 is a view showing a material used in the present invention.

FIG. 4 is a view showing a metal part obtained by post-processing a molded article formed by the present invention.

FIG. 5 is a view showing an embodiment of the present invention (with the mold opened).

FIG. 6 is a view showing an embodiment of the present invention (mold clamping state).

FIG. 7 is a view showing an embodiment of the present invention (extruding a material with a lower punch).

FIG. 8 is a view showing an embodiment of the present invention (extrusion of material with upper punch).

FIG. 9 is a view showing an embodiment of the present invention (formation of a deep hole by an upper punch and a lower punch, cooling).

FIG. 10 is a diagram showing an embodiment of the present invention (removal of a partition wall by an upper punch).

FIG. 11 is a view showing an embodiment of the present invention (state in which the punch is retracted).

FIG. 12 is a view showing an embodiment of the present invention (with the mold opened).

FIG. 13 is a view showing an embodiment of the present invention (a molded body is knocked out).

[Explanation of symbols]

1: Faucet fitting body, 2: Shower connection, 3: Pipe side connection, 4: Spout connection, 5: Water volume control knob, 6: Temperature control knob, 11: Pipe side connection water passage, 12: Pipe Side connection part mounting screw, 13: spout connection part mixed water passage, 14: spout connection part mounting screw, 15: shower connection part mixed water passage, 1
6: Water volume / temperature control cartridge mounting part, 21: Main frame, 22: Lower die, 23: Lower punch, 24: Lower punch guide, 25: Lower punch guide lowering bolt, 26: Side punch A
1, 27: side punch A2, 28: side punch B, 29: upper slider, 30: upper die B, 31: upper die A, 32: upper die A guide, 33: upper punch, 34: cooling air inlet , 35:
Cooling groove, 36: cooling air outlet, 37: spring, 38: belt heater, 39: heat insulating material, 40: heat insulating plate, 41: heater

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E03C 1/042 E03C 1/042 Z 1/044 1/044 F-term (Reference) 2D060 BB01 BD01 4E087 AA06 AA10 BA17 CA24 CA27 CB01 EC15 EC17 ED00 ED12 GA09 HA00 HA29 HB02

Claims (5)

[Claims] An upper punch which has a mold which can be divided into a plurality of parts and which can be moved forward and backward toward a space surrounded by these molds, and a lower part which can be moved forward and backward at a position opposed to the upper punch. A punch and a lower punch guide for guiding the lower punch are arranged, and the lower punch guide retreats together with the lower punch against the pressing force of the upper punch, and engages with a part of the mold to form only the lower punch guide. The forging device is arranged such that retraction is restricted, and the upper punch is movably arranged until the upper punch is positioned in the lower punch guide whose retraction is restricted. 2. The forging apparatus according to claim 1, wherein cooling means is provided for cooling a position near the space side of the lower punch guide at a position where the lower punch guide is restricted from retreating. apparatus. 3. The forging device according to claim 2, wherein said cooling means is air. 4. An upper punch is pressed against a material placed in a space surrounded by a mold that can be divided into a plurality of parts, and is disposed at a position facing the upper punch against the pressing force of the upper punch. A step of forming a deep hole by retreating a lower punch having a lower punch guide, and a step of punching a partition wall between the upper punch and the lower punch by the upper punch and the lower punch guide, wherein the lower punch guide is restricted from retreating. A method for producing at least a metal component. 5. An upper punch is pressed toward a material placed in a space surrounded by a mold that can be divided into a plurality of dies, and is disposed at a position facing the upper punch against the pressing force of the upper punch. A step in which the lower punch having the lower punch guide is retracted to form a deep hole; a step in which the lower punch guide is restricted from retreating; and a step in which the partition wall between the upper punch tip surface and the lower punch end surface is cooled to a brittle region; And a lower punch guide for punching a partition wall between the upper punch and the lower punch.