KR101693277B1 - Plunger tip and plunger tip manufacturing mothod for die casting - Google Patents

Plunger tip and plunger tip manufacturing mothod for die casting Download PDF

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Publication number
KR101693277B1
KR101693277B1 KR1020160016396A KR20160016396A KR101693277B1 KR 101693277 B1 KR101693277 B1 KR 101693277B1 KR 1020160016396 A KR1020160016396 A KR 1020160016396A KR 20160016396 A KR20160016396 A KR 20160016396A KR 101693277 B1 KR101693277 B1 KR 101693277B1
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KR
South Korea
Prior art keywords
plunger tip
die casting
insert
manufacturing
present
Prior art date
Application number
KR1020160016396A
Other languages
Korean (ko)
Inventor
이철규
신찬섭
양종현
Original Assignee
이철규
신찬섭
양종현
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Application filed by 이철규, 신찬섭, 양종현 filed Critical 이철규
Priority to KR1020160016396A priority Critical patent/KR101693277B1/en
Application granted granted Critical
Publication of KR101693277B1 publication Critical patent/KR101693277B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
    • B22D17/04—Plunger machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/203—Injection pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/02—Casting in, on, or around objects which form part of the product for making reinforced articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/04—Casting in, on, or around objects which form part of the product for joining parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
    • B24B19/10—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding pistons
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The purpose of the present invention is to provide a manufacturing method of a plunger tip for die casting comprising: a step of manufacturing an insert unit to cover an end of the plunger tip which is worn out the worst; a step of casting a body by inserting the insert unit into a mold (not shown); a step of annealing the integrated insert unit and the body, that is to say the plunger tip; a step of rough-machining the annealed plunger tip; a step of thermally treating the rough-machined plunger tip in a vacuum condition; and a step of precisely treating the plunger tip thermally treated in a vacuum condition. The manufacturing method of the plunger tip for die casting is capable of enabling the plunger tip to obtain optimal durability while minimizing manufacturing costs by minimizing amounts of used special steel and alloy steel which are expensive by forming the insert unit made of the special steel or the alloy steel with excellent durability in the part of the plunger tip which is worn out the worst. Accordingly, the accuracy and efficiency of die casting are improved.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a plunger tip for a die casting,

The present invention relates to a method of manufacturing a plunger tip for die casting, and more particularly, to a method of manufacturing a plunger tip for a die casting, in which a portion of the plunger tip is abraded by a special steel is manufactured by combining the plunger tip with the body of the plunger tip, And more particularly, to a method of manufacturing a plunger tip for die casting to improve precision and efficiency of a die casting operation.

In general, die casting is capable of producing complex and thin castings by injecting molten metal into a mold space by applying high temperature, high speed, high pressure to the molten metal and molding and solidifying a product having a desired shape, , Daily necessities, mobile phone frames and digital camera bodies.

As shown in Fig. 1, the die-casting apparatus is formed with a sleeve 2 so as to communicate with a cavity 1a such as a product formed in the mold 1, and a molten metal And a piston rod 4 of a cylinder which is linearly in line with the sleeve 2 and is actuated by pneumatic or hydraulic pressure is arranged so as to be movable forward and backward, And a plunger tip 10 for pressurizing the molten metal introduced into the sleeve 2 and injecting the molten metal into the cavity 1a of the mold 1 is coupled to the tip end portion.

The plunger tip 10 is formed of a material such as mostly cast iron, SKD-61 or a small amount of beryllium copper depending on import, and its configuration is mostly composed of a piston rod 4 A step portion 12a for easily accommodating the pressure when the molten metal is injected is formed in the front end portion of the injection portion 12 so as to surround the molten metal, And a hollow portion 12b is formed in the injection portion 12 so as to easily accommodate the shrinkage state when the molten metal is injected. The piston rod 4 is continuously connected to the hollow portion 12b The mounting portion 11 is formed in a square or hexagonal and octagonal shape so that the mounting portion 11 can easily be mounted on the outside. The mounting portion 11 has an insertion hole Holes are formed.

Since the plunge tip 10 is mainly made of cast iron and has a good casting property, it can be easily broken by impact due to weak tensile strength and hardness, and it is difficult to obtain a uniform structure and strength because the cooling rate varies depending on its thickness. The surface is worn or damaged, and therefore, it can not be used for a long time, and it is frequently required to be replaced with a new one.

Accordingly, there is disclosed a method of manufacturing a plunger tip for die casting in which a coating layer is formed, in which a plunger tip body is formed of an aluminum material, such as that disclosed in Registration Practice No. 20-0357100, and the surface of the plunger tip body is coated to form a coating layer This is a kind of microdischarge electrodeposition, which is a technique of coating the surface of the plunger tip with a thin film ceramic by locally generating a plasma discharge in the electrolytic solution on the surface, which means that there is a wear limit and when the coating is peeled off, It is disadvantageous in that the durability is significantly lowered.

In addition, as shown in the registration room No. 20-0327496, an extension part integrally bent at one end of the plunger tip and threaded along the outer circumferential surface thereof, and a covering part made of special alloy steel and a double metal material are screwed to the outer circumferential surface of the extension part Although a manufacturing method of a plunger tip for die casting has been developed, it is possible to prevent an economical waste caused by using the entire plunger tip as an alloy steel, but since the entire covering portion is an alloy steel, a considerable economic burden can not be avoided , And most of all, since the plunger tip and the covering portion are formed with the spiral thread for screw connection, the processed portion must be fragile, resulting in a short connection portion.

[Prior Art Literature]

1. Register Room 20-0357100

2. Registration office 20-0327496

In order to solve the above-mentioned problems, an object of the present invention is to provide a plunger tip in which abrasion of a plunger tip is made of a special steel, which is manufactured by incorporating an insert into a body of a plunger tip, And to provide a method of manufacturing a plunger tip for die casting.

According to an aspect of the present invention, there is provided an insert unit for covering an end of a plunger tip having the greatest wear and a main body for supporting the insert unit, And the main body is provided with a plurality of protruding protrusions which are inserted into and bonded to all the through holes formed by the rings of the insert and the connecting rods.

According to the embodiment of the present invention, the width of the ring located at the end of the body of the pair of rings is formed to be longer than the width of the other ring.

According to the embodiment of the present invention, a plurality of ribs are formed on the inner side surface of the inner space portion of the main body.

According to another aspect of the present invention, there is provided a method of manufacturing an insert, comprising the steps of: preparing an insert for covering an end of a plunger tip most abrasive; and inserting the insert into a mold (not shown) A step of annealing the integrated insert and the body, i.e., the plunger tip, a step of roughing the heat treated plunger tip, a vacuum heat treatment of the roughed plunger tip, And precisely machining the plunger tip.

Another method of manufacturing a plunger tip for die casting includes casting the body of the plunger tip and inserting the body into a mold to produce an insert for covering the end of the plunger tip with the most wear, A step of annealing the integrated insert and the body, i.e., the plunger tip, a step of roughing the heat treated plunger tip, a vacuum heat treatment of the roughed plunger tip, And a step of precision machining the tip.

According to the effect of the present invention as described above, since the insert portion made of special steel or alloy steel having excellent abrasion resistance is formed at the portion of the plunger tip which is highly abrasive, the amount of expensive special steel and alloy steel can be minimized to minimize the economic cost, The accuracy and efficiency of the die casting operation can be improved.

In addition, the present invention provides an insert part made of an abrasion resistant material, a body for supporting the insert part integrally formed with the insert part, and a vacuum heat treatment taking into account the different thermal expansion thereof, It is an invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a typical die casting apparatus. Fig.
2 is a perspective view showing a conventional plunger tip for die casting.
3 is a sectional view of Fig. 2;
4 is an exploded perspective view of a plunger tip for die casting according to one embodiment of the present invention.
Figure 5 is a perspective view of the combined state of Figure 4;
Fig. 6 is a sectional view of Fig. 5; Fig.
FIG. 7 is a cross-sectional view of a state in which a part of FIG. 5 is cut away; FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. Also, the singular forms used herein include plural forms as long as the phrases do not expressly mean the opposite. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like. Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further construed to have meanings consistent with the relevant technical literature and the present disclosure and are not to be construed as ideal or official unless defined otherwise.

The embodiment of the present invention described with reference to the perspective view specifically illustrates an ideal embodiment of the present invention. As a result, various variations of the illustration, for example variations in the manufacturing method and / or specification, are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture. For example, the regions shown or described as being flat may have characteristics that are generally coarse / rough and nonlinear. Also, the portion shown as having a sharp angle may be rounded. Thus, the regions shown in the figures are merely approximate, and their shapes are not intended to depict the exact shape of the regions, nor are they intended to limit the scope of the present invention.

Hereinafter, preferred embodiments of a method of manufacturing a plunger tip for die casting according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a perspective view of the plunger tip for die casting according to an embodiment of the present invention, FIG. 5 is a perspective view of the combined state of FIG. 4, FIG. 6 is a sectional view of FIG. 5, Sectional view of the cut-away state.

First, in the drawings, it is noted that the same components or parts are denoted by the same reference numerals as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

The plunger tip 100 for die casting according to the embodiment of the present invention includes an insert portion 110 for covering an end of a plunger tip having the most abrasion and a main body 120 for supporting the insert portion.

That is, the plunger tip 100 of the present invention includes two rings 111 and 112, at least one connecting rod 113 connecting the rings 111 and 112, a through hole 114 formed by the rings 111 and 112 and the connecting rod 113, An insertion protrusion 121 for insertion into the insertion hole 111a of the insert part 110 and a through hole 114 protruding at one side of the outer surface of the insertion protrusion 121, And a main body 120 having a plurality of locking protrusions 122 which are inserted and coupled to the main body 120. At this time, an engaging portion 123 for connecting with the piston rod is formed at the rear of the main body 120.

The reason why the front ring 111, the rear ring 112 and the two rings 111 and 112 are required in the present invention is that only one ring can achieve the object of the present invention but only one ring is formed at the end of the body 120 It is in a very fragile state and can be released from the body 120. Therefore, the connecting rod 113 connects the front ring 111 to the rear ring 112 to hold the front ring 111.

Also, if the two rings 111 and 112 are disposed with a slight separation distance, only one ring can be prevented from being worn, and wear resistance is improved.

The main body 120 is made of FCD 55, which is a general cast material, and the material of the insert 110 is preferably made of special steel or alloy steel having good wear resistance, preferably SKD 61.

The width of the ring, that is, the front ring 111, located at the end of the main body of the front ring 111 and the rear ring 112, of the insert part 110 is greater than the width of the rear ring 112 It is preferable to form it long. This is because the wear of the front ring 111 is much greater than the wear of the rear ring 112.

In addition, it is preferable that the width of the front ring 111 is made longer than the width of the rear ring 112 so that the front ring 111 having a high degree of wear can be further strengthened.

The insertion protrusion 121 of the main body 120 is inserted into the insertion hole 111a of the insert part 110 and the insertion protrusion 121 of the main body 120 is inserted into the through hole 114 of the insert part 110, It is possible to insert the insert 122 by an insert casting method.

A plurality of ribs 124a may be formed on the inner surface of the inner space 124 of the main body 120 so as to reinforce the fragile portion of the main body 120 by the engagement of the insert portion 110 And the heat dissipation effect of the main body 120 is improved.

A method of manufacturing a plunger tip for die casting includes the steps of: preparing an insert portion (110) for covering an end of a plunger tip having the most abrasion; and inserting the insert portion (110) into a mold Casting the body 120 of the plunger tip in an inserting manner; annealing the integrated insert and the body, i.e., the plunger tip, to rough heat the heat treated plunger tip; Vacuum heat treatment of the plunger tip, and precision machining of the vacuum heat treated plunger tip.

Another method of manufacturing a plunger tip for die casting includes casting the body of the plunger tip and inserting the body into a mold to produce an insert for covering the end of the plunger tip with the most wear, A step of annealing the integrated insert and the body, i.e., the plunger tip, a step of roughing the heat treated plunger tip, a vacuum heat treatment of the roughed plunger tip, And precisely machining the tip. Roughing means rough machining. In the present invention, it is of course possible to perform vacuum heat treatment without roughing.

The vacuum heat treatment refers to all the heat treatment in a vacuum state, and is a well known technique, and a detailed description thereof will be omitted.

Particularly, in the present invention, after the plunger tip is manufactured by integrally casting the insert part 110 and the main body 120, heat treatment after roughing is very important.

Although the body 120 and the insert 110 are made of different materials, that is, the body 120 is made of FCD 55, and the insert part 110 is made of a material different from the material of the insert 120, When the above-described method is applied to the plunger tip 100 of the present invention using SKD 61 as a main component, there is a serious problem that the plunger tip is damaged due to different thermal expansion of the body and the insert portion.

Therefore, through the numerous experiments, the vacuum heat treatment method is applied as the most suitable heat treatment method which can solve this problem in the present invention. This is because the vacuum heat treatment method does not induce other thermal expansion in the main body and the insert portion so that damage does not occur. In the present invention, the vacuum heat treatment may include tempering.

Although the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the present invention is not limited thereto and that various changes and modifications will be apparent to those skilled in the art. Various modifications and variations are possible within the scope of the appended claims.

100: Inventive Plunger Tip
110: insert part
111: front ring 112: rear ring
113: connecting rod 114: through hole
120:
121: insertion protrusion 122:

Claims (5)

Fabricating an insert portion for covering an end of the plunger tip with the most abrasion,
Casting the insert by inserting the insert into the mold;
A step of annealing the integrated insert part and the main body, i.e., the plunger tip,
Roughing the heat treated plunger tip;
Vacuum heat treating the roughed plunger tip;
And then finishing the vacuum heat-treated plunger tip. [3] The method of manufacturing a plunger tip for a die casting according to claim 1,
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KR1020160016396A 2016-02-12 2016-02-12 Plunger tip and plunger tip manufacturing mothod for die casting KR101693277B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190043762A (en) 2017-10-19 2019-04-29 변길식 Manufacturing method of plunger tip for die casting
KR20230050959A (en) 2021-10-08 2023-04-17 주식회사 상익기공 Plunger tip of die casting device for burr removal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200327496Y1 (en) * 2003-07-01 2003-09-19 신현택 A plunger tip for die casting
KR20050098666A (en) * 2004-04-08 2005-10-12 씨티코리아(주) Method for manufacturing the plunger tip of die-casting machine
KR20060108953A (en) * 2005-04-13 2006-10-19 신현덕 Plunger tip for die casting
KR20090093594A (en) * 2008-02-29 2009-09-02 서영범 Method of producing plunger tip for diecast machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200327496Y1 (en) * 2003-07-01 2003-09-19 신현택 A plunger tip for die casting
KR20050098666A (en) * 2004-04-08 2005-10-12 씨티코리아(주) Method for manufacturing the plunger tip of die-casting machine
KR20060108953A (en) * 2005-04-13 2006-10-19 신현덕 Plunger tip for die casting
KR20090093594A (en) * 2008-02-29 2009-09-02 서영범 Method of producing plunger tip for diecast machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190043762A (en) 2017-10-19 2019-04-29 변길식 Manufacturing method of plunger tip for die casting
KR20230050959A (en) 2021-10-08 2023-04-17 주식회사 상익기공 Plunger tip of die casting device for burr removal

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