KR100999439B1 - Powder metallurgy press mold and molding method using threof - Google Patents

Powder metallurgy press mold and molding method using threof Download PDF

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Publication number
KR100999439B1
KR100999439B1 KR1020100064746A KR20100064746A KR100999439B1 KR 100999439 B1 KR100999439 B1 KR 100999439B1 KR 1020100064746 A KR1020100064746 A KR 1020100064746A KR 20100064746 A KR20100064746 A KR 20100064746A KR 100999439 B1 KR100999439 B1 KR 100999439B1
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KR
South Korea
Prior art keywords
side core
mold
die
out punch
hole
Prior art date
Application number
KR1020100064746A
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Korean (ko)
Inventor
정삼균
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정삼균
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Priority to KR1020100064746A priority Critical patent/KR100999439B1/en
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Publication of KR100999439B1 publication Critical patent/KR100999439B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B22F2003/033—Press-moulding apparatus therefor with multiple punches working in the same direction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press metallurgical mold for metallurgy and a molding method using the same. In particular, an upper mold having an upper out punch and an inner diameter having the same inner diameter as the outer circumferential surface of a powder metallurgical product, such as a rod guide, are filled with metal powder. A press mold comprising a die having a filling hole provided with a hole, and a lower mold having a lower out punch, the press mold comprising: an upper side core formed at least one of the upper out punch of the upper mold in a length direction; At least one lower side core formed in a length direction at a position corresponding to the upper side core among the upper out punches of the lower mold; And an elevating member for elevating the lower side core.
According to the present invention as described above, the side core is separated into the upper and lower parts and designed to be positioned in the upper out punch and the lower mold of the upper mold, respectively, to form a short length of the side core, the lower side core to the filling hole when the metal powder is filled It is lifted to form a hole, and during molding, the upper side core is inserted into the hole and the lower side core is lowered by the air cylinder and positioned on the bottom of the rod guide so that the side core is damaged by the pressure generated at the side during molding. You can prevent it.

Description

Press mold for powder metallurgy and molding method using the same {POWDER METALLURGY PRESS MOLD AND MOLDING METHOD USING THREOF}

The present invention relates to a powder metallurgy press mold and a molding method using the same. Specifically, the side core is separated into the upper and lower parts, and designed to be positioned at the upper out punch and the lower mold of the upper mold, respectively, to shorten the length of the side core. The lower side core relates to a powder metallurgy press mold and a molding method using the same so that the lower side core is elevated to the filling hole to form the hole when the metal powder is filled.

Powder metallurgy is a method of compacting and then sintering metal powder to obtain a final molded product. The powder metallurgy method shows a very large difference from the method of obtaining a molded product by rolling, forging, casting, etc., and a product which is difficult to manufacture through a melting process is usually manufactured by powder metallurgy.

Powder metallurgy is mainly used for sintered iron, brass, bronze, stainless steel, etc. In order to supplement the physical properties of the manufactured articles, various main metal powders are added and molded into the main material. As an example, a technique is known in which fine powders such as graphite and copper are mixed with a main material, and the powder mixture is sintered to improve strength, weather resistance, wear resistance, and the like.

In addition, a technique for producing a sintered part having high toughness and high strength by sintering by adding nickel and molybdenum to the main material for the purpose of expanding the application range of the sintered part is known.

The powder metallurgy method as described above has various kinds of advantages that cannot be obtained as a material produced by melting. In particular, it is possible to easily obtain a product requiring high dimensional accuracy, and there is an advantage of not having to cut the manufactured product.

Due to such advantages, various types of parts manufactured by the melting process are gradually manufactured by powder metallurgy.

On the other hand, the road guide manufactured by powder metallurgy also enters the shock-up showbar of the automobile, as shown in Figure 1, the rod guide (A) has a large diameter center hole (B) is formed to guide the rod in the center, A hole C through which oil or gas penetrates around the center hole B is formed radially.

On the other hand, the method of forming a hole in powder metallurgy has a problem that the manufacturing cost and manufacturing time is increased because the hole is usually processed separately through post-processing.

In order to solve this problem, a press die which integrally forms a hole using a side core is used during molding.

As shown in FIG. 2, the press mold 1 includes an upper mold 10, a die 20, and a lower mold 30.

First, the upper mold 10 includes an upper back plate 12 to which the holder 11 is bolted to an upper surface, an upper out punch 13 to be coupled to a bottom surface of the upper back plate 12, and a holder 11. It consists of an upper inner punch 14 which is fixed while being drawn into the upper out punch 13 through the upper back plate 12. At this time, the first guide hole 15 into which the side core 37 of the lower mold 30 is inserted in the longitudinal direction is formed outside the upper out punch 13.

In addition, the inner diameter of the die 20 is formed in the same shape as the outer circumferential surface of the rod guide, and the filling hole 21 in which the metal powder is seated is formed in the center portion.

In addition, the lower mold 30 has a lower first back plate 31, a lower out punch 32 coupled to an upper surface of the lower first back plate 31, and a lower portion located below the lower out punch 32. The lower inner punch 34 coupled to the second back plate 33, the upper surface of the lower second back plate 33, and drawn into the lower out punch 32, and the lower portion of the lower second back plate 33. Is fixed to the clamp 35, inserted into the lower inner punch 34, and the upper end is installed on the side of the center core 36 and the center core 36 inserted into the lower end of the upper inner punch 14. The side core 37 forming the hole C of the rod guide A is fixed. At this time, outside the lower out punch 32 and the lower inner punch 34, a second guide hole 38 into which the side core 37 is inserted in the longitudinal direction is formed.

Referring to the process of forming the product of the rod guide through the press die, as shown in Figure 3a, the lower out punch 32 and the lower inner punch of the lower die 30 in the filling hole 21 of the die 20 The metal powder P is filled in the empty space of the filling hole 21 in the state in which the 34 and the center core 36 and the side core 37 are inserted.

In this state, the upper mold 10 is lowered to the die to apply pressure as shown in FIG. 3B.

Then, the load guide while the lower out punch 32 and the center core 36 and the side core 37 corresponding to the upper inner punch 14 and the upper out punch 13 are lowered by the pressure of the upper mold 10. (A) is molded. At this time, the center hole B is formed by the center core 36 in the center of the rod guide A, and the hole C is simultaneously formed on the outside of the center hole B by the side core 37.

As shown in FIG. 3C, the upper die 10 is raised, the die 20 is lowered, and the rod guide A is discharged by the lower out punch 32.

However, as shown in FIGS. 3D and 3E, the side core 37 dies through the lower out punch 32 and the lower inner punch 34 in the clamp 35 located at the bottom of the lower mold 30. It has a length (approximately 50 cm or more) extending to the filling hole 21 of (20), and because the diameter is 2.2 mm or less, the pressure of the side core 37 by the pressure generated on the side when applying pressure for molding There is a problem that the upper end is broken, and the fragments of the broken side core 37 are discharged together when the rod guide A is discharged.

The present invention is to solve the above problems, the side core is separated into the upper and lower parts to be positioned in the upper out punch and the lower mold of the upper mold, respectively, to form a short length of the side core, the lower side core is a metal powder During filling, the hole is lifted up to fill the hole, and during molding, the upper side core is inserted into the hole and the lower side core is lowered by the air cylinder and positioned on the bottom of the rod guide. It is an object of the present invention to provide a press mold for powder metallurgy and a molding method using the same to prevent the side core from being broken.

Features of the present invention for achieving the above object,

A die having an upper mold having an upper out punch, a filling hole having an inner diameter in the same shape as an outer circumferential surface of a powder metallurgical product such as a rod guide, and having a filling hole in which metal powder is seated, and a lower having a lower out punch. A press mold comprising a mold, the press mold comprising: an upper side core formed on at least one upper out punch of the upper mold in a length direction; At least one lower side core formed in a length direction at a position corresponding to the upper side core among the lower out punches of the lower mold; And an elevating member for elevating the lower side core.

Here, the upper side core protrudes from the upper out punch to the lower end such that the lower end thereof lowers the lower side core upon the lowering of the upper mold by a molding process.

Here, the lower side core protrudes upward from the lower out punch so that an upper end thereof forms a hole when metal powder is filled in the filling hole of the die.

Here, the elevating member is an air cylinder which is located at the lower end of the lower out punch and raises and lowers the lower side core by a piston, and a solenoid valve is installed on the air line of the air cylinder to form a molding cycle. The solenoid valve raises and lowers the lower side core by raising and lowering the piston of the air cylinder.

According to another aspect of the present invention,

In the molding method using the above-mentioned powder metallurgy press die, the lower out punch, the lower inner punch and the center core of the lower mold are placed into the filling hole of the die, and at the same time, the lower side core is supplied by supplying air into the elevating member. A first step of elevating into the filling hole of the die; A second step of filling metal powder in the filling hole of the die; A third step of lowering the upper mold with a die to press the upper out punch and the upper inner punch to press the metal powder filled in the filling hole of the die, and to lower the lower side core with the upper side core; A fourth step of raising the upper mold and lowering the lower mold to discharge molded products; And a fifth step of raising and lowering the lower side core into the filling hole of the die by supplying air into the elevating member while returning the lower mold to the initial position.

According to the powder metallurgy press mold and the molding method using the same according to the present invention, the side core is separated into the upper and lower parts and designed to be located at the upper out punch and the lower mold of the upper mold, respectively, to form a short length of the side core. When the lower side core is filled with metal powder, it is elevated to the filling hole to form a hole, and during molding, the upper side core is inserted into the hole and the lower side core is lowered by the air cylinder to be positioned at the bottom of the rod guide. There is an advantage that can prevent the side core from being damaged by the pressure generated in the side.

1 is a perspective view showing the configuration of a road guide for a shock-up showbar of an automobile.
Figure 2 is a side cross-sectional view showing a press die integrally forming a hole using a conventional side core.
3A and 3E are explanatory diagrams showing an operating state of a press die for integrally forming holes using a conventional side core.
Figure 4 is a side cross-sectional view showing the configuration of a press mold for powder metallurgy according to the present invention.
5a to 5f is an operational state diagram for explaining a molding method using a powder metallurgy press mold according to the present invention.

Hereinafter, with reference to the accompanying drawings, the configuration of the powder metallurgy press mold according to the present invention will be described in detail.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Figure 4 is a side cross-sectional view showing the configuration of a press mold for powder metallurgy according to the present invention.

Referring to FIG. 4, the powder metallurgy press mold 100 according to the present invention further includes an upper side core 110, a lower side core 120, and a lifting member 130.

At this time, the upper die 10, the die 20, and the lower die 30 are given the same reference numerals and have the same configuration as in the prior art, and their overlapping description is omitted, and only the changed parts will be described.

First, the upper side core 110 is formed at least one fixed to the upper out punch 13 of the upper mold 10 in the longitudinal direction, the lower end of the lower during the lowering of the upper mold 10 by the molding process It protrudes from the upper out punch 13 to the lower end to lower the side core 120.

Here, the number of the upper side core 110 is determined according to the position and the number of the holes (C) formed in the rod guide (A), the installation position and number is determined, the diameter can form the hole (C) It is preferably formed to be 2.2 mm or less.

In addition, the lower side core 120 penetrates through the lower out punch 32 of the lower mold 30, and a lower end thereof is fixed to the lower first back plate 31, and an upper end thereof is a filling hole of the die 20. The metal powder protrudes from the lower out punch 32 to the top so as to form the hole C when the metal powder 21 is filled.

Here, the number of the lower side core 120 is installed to correspond to the number and position of the upper side core 110 1: 1, it is preferable that the diameter is the same diameter as the upper side core (110).

Here, the lower first back plate 31 is provided with a guide hole 31a therein so that the elevating member 130, which will be described below, is raised and lowered so that the lower side core 120 is elevated.

In addition, the elevating member 130 is coupled to the bottom of the lower second back plate 33 to raise and lower the lower side core 120 by pneumatic.

Here, the elevating member 130 is an air cylinder for elevating the lower side core 120 while the piston 131 is elevated along the guide hole 31a of the lower first back plate 31.

Here, a solenoid valve 133 is installed on an air cylinder, that is, the air line of the elevating member 130, so that the solenoid valve 133 raises and lowers the piston 131 according to a molding cycle, thereby lowering the lower side core 120. Raise and lower. That is, the lower side core 120 is raised and lowered when the metal powder is filled, and the lower side core 120 is lowered when the upper mold 10 is pressurized, and the lower side core (or lower) is filled again after discharge of the rod guide A. The operation of raising 120 is repeated.

Hereinafter, a molding method using a powder metallurgy press mold according to the present invention will be described in detail with reference to the accompanying drawings.

5a to 5f is an operational state diagram for explaining a molding method using a powder metallurgy press mold according to the present invention.

First, as shown in FIG. 5A, the lower out punch 32, the lower inner punch 34 and the center core 36 of the lower mold 20 are placed into the filling hole 21 of the die 20. At the same time, the air is supplied into the air cylinder 130 to raise and lower the lower side core 120 into the filling hole 21 of the die 20 (S100).

In this state, as shown in FIG. 5B, the metal powder P is filled in the filling hole 21 of the die 20 (S110).

When the filling of the metal powder P is completed, the upper die 10 is lowered to the die 20, as shown in FIG. 5C, and the die 20 is formed by the upper out punch 13 and the upper inner punch 14. Pressing the metal powder (P) filled in the filling hole 21 (S120). At this time, the lower side core 120 is lowered to the upper side core 110. The upper side core 110 is inserted into the hole C formed by the lower side core 120 so that the hole C is continuously maintained. do.

When the pressurization is completed, as shown in FIG. 5D, the upper mold 10 is raised, and the lower mold 20 is lowered to discharge the rod guide A, which is a molded product, in operation S130.

When the discharge of the rod guide A is completed, as shown in FIG. 5A, the air is supplied into the air cylinder while returning the lower mold to the initial position, thereby elevating the lower side core into the filling hole of the die, and repeating the above process. Perform (S140).

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

The present invention can be used not only in press molds applied to powder metallurgy but also in forging dies.

10: upper mold 20: die
30: lower mold 110: upper side core
120: lower side core 130: elevating member
A: Rod Guide C: Hole

Claims (5)

A die 20 having an upper mold 10 having an upper out punch 13, and a filling hole 21 having an inner diameter in the same shape as an outer circumferential surface of a powder metallurgical product such as a rod guide and having a metal powder seated thereon; In the press mold which consists of the lower metal mold | type 30 provided with the lower out punch 32,
At least one is formed in the upper out punch 13 of the upper mold 10 in the longitudinal direction, and a lower end thereof protrudes from the upper out punch 13 to the lower end when the upper mold 10 is lowered by a molding process. An upper side core 110;
At least one of the lower out punches 32 of the lower mold 30 is formed at a position corresponding to the upper side core 110 in the length direction, and an upper end thereof is formed in the filling hole 21 of the die 20. A lower side core 120 protruding upward from the lower out punch 32 to form a hole C when the metal powder is filled; And
Powder metallurgy press mold, characterized in that it comprises a lifting member (130) for raising and lowering the lower side core (120). delete delete The method of claim 1,
The elevating member 130,
Located in the lower end of the lower out punch 32 is an air cylinder for raising and lowering the lower side core 120 by the piston 131, the solenoid valve 133 is formed on the air line of the air cylinder is formed The powder metallurgy press die of the solenoid valve is to lift the lower side core 120 by raising and lowering the piston of the air cylinder in accordance with the cycle. In the molding method using the powder metallurgy press die of claim 1,
Position the lower out punch 32 of the lower mold 20, the lower inner punch 34 and the center core 36 into the filling hole 21 of the die 20, and simultaneously supply air into the air cylinder 130. Supplying and lowering the lower side core 120 to the inside of the filling hole 21 of the die 20 (S100);
A second step (S110) of filling the metal powder (P) in the filling hole (21) of the die (20);
The upper mold 10 is lowered to the die 20 to press the upper out punch 13 and the upper inner punch 14 to press the metal powder P filled in the filling hole 21 of the die 20. A third step (S120) of lowering the lower side core 120 to the upper side core 110;
A fourth step S130 of raising the upper mold 10 and lowering the lower mold 20 to discharge the molded product; And
The fifth step (S140) of raising and lowering the lower side core 120 into the filling hole 21 of the die 20 by supplying air into the elevating member 130 while returning the lower mold 20 to the initial position. Molding method using a powder metallurgy press die, characterized in that consisting of.
KR1020100064746A 2010-07-06 2010-07-06 Powder metallurgy press mold and molding method using threof KR100999439B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101060195B1 (en) * 2011-06-15 2011-08-29 고강문 Powder metallurgy press mold and molding method using threof
KR101550690B1 (en) * 2014-02-25 2015-09-08 이석기계 (주) Manufacturing apparatus of core for forming oil gallery of engine piston

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200251129Y1 (en) * 2001-07-09 2001-11-17 주식회사 에이에이치에스 Multi-plate adapter apparatus for powder molding press
KR100841546B1 (en) * 2006-10-30 2008-06-26 오일광 Gear moulding method and apparatus thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200251129Y1 (en) * 2001-07-09 2001-11-17 주식회사 에이에이치에스 Multi-plate adapter apparatus for powder molding press
KR100841546B1 (en) * 2006-10-30 2008-06-26 오일광 Gear moulding method and apparatus thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101060195B1 (en) * 2011-06-15 2011-08-29 고강문 Powder metallurgy press mold and molding method using threof
KR101550690B1 (en) * 2014-02-25 2015-09-08 이석기계 (주) Manufacturing apparatus of core for forming oil gallery of engine piston

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