KR101250852B1 - Beryllium-cooper alloy plunger tip of die-casting machine and manufacturing method thereof - Google Patents

Beryllium-cooper alloy plunger tip of die-casting machine and manufacturing method thereof Download PDF

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KR101250852B1
KR101250852B1 KR1020100109841A KR20100109841A KR101250852B1 KR 101250852 B1 KR101250852 B1 KR 101250852B1 KR 1020100109841 A KR1020100109841 A KR 1020100109841A KR 20100109841 A KR20100109841 A KR 20100109841A KR 101250852 B1 KR101250852 B1 KR 101250852B1
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plunger tip
copper alloy
beryllium copper
die casting
molten metal
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KR1020100109841A
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Korean (ko)
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KR20120048287A (en
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정원표
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정원표
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  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
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Abstract

The present invention relates to a beryllium copper alloy plunger tip for die casting and a method of manufacturing the same, and more particularly, to enable the production of a plunger tip for die casting from a copper beryllium alloy through optimization of a beryllium copper alloy continuous casting process and a heat treatment process, thereby providing high thermal conductivity. The present invention relates to a beryllium copper alloy plunger tip for die casting and a method of manufacturing the same, which can improve the service life of the plunger tip by preventing the shortening of the life due to thermal load and high temperature corrosion by securing the thermal fatigue characteristics.

Description

BERYLLIUM-COOPER ALLOY PLUNGER TIP OF DIE-CASTING MACHINE AND MANUFACTURING METHOD THEREOF}

The present invention relates to a beryllium copper alloy plunger tip for die casting and a method of manufacturing the same, and more particularly, to enable the production of a plunger tip for die casting from a copper beryllium alloy through optimization of a beryllium copper alloy continuous casting process and a heat treatment process, thereby providing high thermal conductivity. The present invention relates to a beryllium copper alloy plunger tip for die casting and a method of manufacturing the same, which can improve the service life of the plunger tip by preventing the shortening of the life due to thermal load and high temperature corrosion by securing the thermal fatigue characteristics.

Die casting, which is one of the casting methods, refers to a process in which molten metal (molten metal) is pressed into a mold having a predetermined shape at a pressure higher than atmospheric pressure, and pressed by casting until the end of solidification. Die-casting is widely used for its advantages such as improved dimensional accuracy, surface smoothness, cutting, and high-speed mass production. The apparatus used to perform this diecast is a diecasting machine.

In general, as shown in FIG. 1, the die casting plunger tip 10 is combined with the plunger rod 30 so that the molten metal M is formed at high pressure and high speed by contacting the molten metal M at the first time in the die casting machine 1. It is a part that is pushed into the gate of the mold through the sleeve 20, which serves as a guide so that.

Therefore, since the die casting plunger tip 10 is exposed to a condition in which contact and cooling with the molten metal M are repeated, heat resistance, thermal fatigue resistance, impact resistance, wear resistance, wear resistance, and high temperature corrosion resistance are required.

Die casting production of non-ferrous materials in Korea is mostly done in small and medium-sized businesses, in addition to some large products or products that require advanced technology, and mainly uses cast iron (FC-25) or mold steel (SKD61) as the plunger tip for die casting. have.

However, the die-casting plunger tip as described above has a disadvantage in that the fatigue life is greatly reduced due to thermal fatigue and damage. Recently, spraying and nanocoating were applied to the surface in order to increase the service life of the plunger tip, but there was no significant effect.

Molds, sleeves and plunger tips, which make up the most important part of the die casting process, have problems with hot cracking and soldering, which greatly affect the quality and life of the product. In particular, the plunger tips require wear resistance and lubricity due to friction with the sleeve.

On the contrary, casting and mold steel plunger tips produced in Korea do not satisfy the requirements as described above, and have a short lifespan.

Beryllium copper (Be-Cu) alloy plunger tips have excellent abrasion resistance, thermal fatigue resistance and thermal shock resistance, but are imported at a high price due to the lack of manufacturing technology by the continuous casting method of high strength beryllium copper alloy.

Therefore, in most die-casting SMEs, inexpensive cast iron or mold steel plunger tips are used in spite of short replacement cycles, and beryllium copper alloy plunger tips are used only in large enterprises or high-end products.

The present invention has been made to solve the problems described above, the object of the present invention is to be able to produce a plunger tip for die casting from a beryllium copper alloy through a beryllium copper alloy continuous casting technology and heat treatment process optimization, high thermal conductivity The present invention provides a beryllium copper alloy plunger tip for die casting and a method of manufacturing the same, which may improve the service life of the plunger tip by preventing the shortening of the life due to thermal load and high temperature corrosion by securing the thermal fatigue characteristics.

It is also an object of the present invention to provide a beryllium copper alloy plunger tip for die casting and a method of manufacturing the same, by producing a high strength beryllium copper alloy wire having an outer diameter of 100 mm or more and a hardness of 400 HV or more.

It is also an object of the present invention to provide a beryllium copper alloy plunger tip for die casting and a method of manufacturing the same, which has abrasion resistance and lubricity even after frequent friction with a sleeve serving as a guide of the molten metal in a die casting machine, thereby delaying the replacement time.

In the manufacturing method of the beryllium copper alloy plunger tip for die casting of the present invention, in the manufacturing method of the beryllium copper alloy plunger tip for die casting, the molten metal (M) inside the melting furnace 1100 heated by the heater unit 1200 is passed through the beryllium Continuous casting step (S10) for continuously casting the copper alloy wire (B); Forging step (S20) for cutting the cast beryllium copper wire (B) to a predetermined length, hitting the surface and forging in the forging press (2000); Processing step (S30) of processing the beryllium copper alloy wire (B) in the form of the plunger tip 100 through a cutting and cutting process; A heat treatment step (S40) of age-hardening the processed plunger tip (100): a polishing step (S50) of polishing the surface of the plunger tip (100) heat-treated; Characterized in that it comprises a.

In addition, the forging step (S20) is characterized in that the forging operation to hit the surface by heating the beryllium copper alloy wire (B) cut to a predetermined length to 820 ~ 870 ℃.

In addition, the continuous casting step (S10) is deoxidation of the molten metal (M) by supplying argon (Ar) or nitrogen (N 2 ) gas to the gas injection unit (1310, 1320, 1330, 1340) formed in the melting furnace 1100 And molten metal (M) purification step (S11) of controlling oxygen to a predetermined amount or less by removing impurities; An active metal addition step (S12) of adding an active metal to the purified molten metal (M); And taking out step (S13) for casting the beryllium copper alloy wire (B) by adjusting the take-out rate of the molten metal (M) to which the active metal is added in a predetermined cycle; And a control unit.

In addition, the beryllium copper alloy wire (B) cast in the continuous casting step (S10) is characterized in that the diameter of 100mm ~ 110mm .

In addition, the heat treatment step (S40) is characterized in that the age-hardened heat treatment 0.5 to 5 hours by heating the processed plunger tip 100 to 300 ~ 350 ℃.

In addition, the processing step (S30) is a hollow molding step (S31) is formed by cutting the inside of the beryllium copper alloy wire (B) of the cylindrical shape is a hollow portion 120 is open and hollow inside one side; And a thread processing step (S32) in which the female thread 110 is processed on the open inner circumferential surface of the hollow part 120.

In addition, the beryllium copper alloy plunger tip for die casting of the present invention is characterized by being manufactured by the method for producing the beryllium copper alloy plunger tip for die casting.

The beryllium copper alloy plunger tip for die casting of the present invention and a method of manufacturing the same are capable of producing a die casting plunger tip from a beryllium copper alloy through a beryllium copper alloy continuous casting technique and heat treatment process optimization, thereby improving high thermal conductivity and thermal fatigue characteristics. It has the advantage that the life of the plunger tip can be improved by preventing the shortening of the life due to thermal load and high temperature corrosion.

In addition, the method of manufacturing the beryllium copper alloy plunger tip for die casting of the present invention has an advantage of improving the service life of the plunger tip by enabling production of a high strength beryllium copper alloy wire having an outer diameter of 100 mm or more and a hardness of 400 HV or more.

In addition, the beryllium copper alloy plunger tip for die casting of the present invention has the advantage that the replacement time can be delayed due to wear resistance and lubricity even with frequent friction with the sleeve serving as a guide of the melt in the die casting machine.

In addition, the beryllium copper alloy plunger tip for die casting of the present invention and a method of manufacturing the same may be achieved by localizing the beryllium copper alloy plunger tip, which has been dependent only on imports, thereby contributing to cost reduction and improved productivity and competitiveness of domestic die casting manufacturers. There is an advantage that it can.

In addition, the beryllium copper alloy plunger tip for die casting of the present invention and its manufacturing method can be applied to the production of dies for extrusion and forging of nonferrous alloys such as aluminum and magnesium, and the semi-melt extrusion, which has been difficult to industrialize due to mold damage and reaction problems. The advantage is that it can be applied to forging and cross-section extrusion parts.

1 is a cross-sectional view showing a typical die casting machine.
Figure 2 is a flow chart showing a method for producing a beryllium copper alloy plunger tip for die casting according to the present invention.
3 is a cross-sectional view showing a horizontal continuous casting apparatus according to the present invention.
Figure 4 is a flow chart showing a continuous casting method according to the present invention.
5 is a perspective view showing a beryllium copper alloy plunger tip for die casting according to the present invention.
Figure 6 is a cross-sectional view showing a beryllium copper alloy plunger tip for die casting according to the present invention.
Figure 7 is an exploded perspective view showing a forging press die and beryllium copper alloy wire according to the present invention.

Hereinafter, the beryllium copper alloy plunger tip for die casting of the present invention having the characteristics as described above and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.

Figure 1 is a cross-sectional view showing a typical die casting machine, Figure 2 is a flow chart showing a method for producing a beryllium copper alloy plunger tip for die casting according to the present invention, Figure 3 is a cross-sectional view showing a horizontal continuous casting apparatus according to the present invention, Figure 4 5 is a flow chart showing a continuous casting method according to the present invention, Figure 5 is a perspective view showing a beryllium copper alloy plunger tip for die casting according to the present invention, Figure 6 is a cross-sectional view showing a beryllium copper alloy plunger tip for die casting according to the present invention. 7 is an exploded perspective view showing a forging press die and a beryllium copper alloy wire according to the present invention.

The method of manufacturing the beryllium copper alloy plunger tip for die casting of the present invention includes a continuous casting step (S10), a forging step (S20), a processing step (S30), a heat treatment step (S40), and a polishing step (S50).

First, the continuous casting step S10 is a step of continuously casting the beryllium copper alloy wire B by passing the molten metal M inside the melting furnace 1100 heated by the heater unit 1200. The beryllium copper alloy wire (B) cast in the continuous casting step (S10) may have a diameter of 100mm ~ 110mm .

As shown in Figures 3 to 4, the casting device used in the continuous casting step (S10) is preferably a horizontal continuous casting device 1000 is easy to mass and continuous casting, the continuous casting step (S10) Molten metal (M) purification step (S11), active metal addition step and take-out step (S13).

First, the casting apparatus 1000 will be described. The moving path of the molten metal M is cooled by the melting furnace 1100, the heater 1200 for heating the molten metal M inside the melting furnace 1100, and the cooling water. Cooling means 1400 for cooling and solidifying the molten metal M, a mold 1500 in which a slag of the molten metal M and the molten metal M is reduced, and the cast steel is provided, It is preferably formed to include a transfer unit 1600 for taking out the slab discharged from the mold 1500.

The molten metal (M) purification step (S11) is supplied to the molten metal (M) by supplying argon (Ar) or nitrogen (N 2 ) through the gas injection unit (1310, 1320, 1330, 1340) inside the melting furnace (1100). It is a step of controlling the oxygen to a predetermined amount or less by removing the deoxidation and impurities.

At this time, the concentration of oxygen is preferably controlled to 10 ppm or less.

The active metal addition step (S12) is a step of adding the active metal to the molten metal (M) purified through the molten metal (M) purification step (S11).

In this way, the beryllium copper alloy plunger tip manufacturing method of the present invention has the advantage that the active metal can exhibit the desired characteristics according to the element added without causing the oxidation reaction with the oxygen in the air at the time of the active metal addition step (S12). .

The active metal may be any one or more selected from aluminum (Al), iron (Fe), silicon (Si), and nickel (Ni).

The take-out step S13 is a step of taking out the cast through the operation of the transfer unit 1600, it is preferable that the take-out speed and the forward-retraction direction of the transfer unit 1600 has a certain cycle.

For example, the constant cycle may be two steps of forward / stop or a three-step cycle of forward / stop / reverse or backward / stop / forward.

The forging step (S20) is a step of cutting the cast beryllium copper alloy wire (B) to a predetermined length, hitting the surface and forging in the forging press (2000).

At this time, the beryllium copper alloy wire (B) is preferably cut to a length of about 1m. The cut beryllium copper alloy wire (B) is forged in the forging press (2000) as shown in Figure 7, the temperature is suitable between 820 ~ 870 ℃, preferably about 850 ℃.

The beryllium copper alloy wire (B) hotly heated is hit by the surface in the forging press (2000) and subjected to the forging step (S20).

Through the forging step (S20), the diameter of the beryllium copper alloy wire (B) is reduced from 110mm to 100mm , the structure is more dense, the hardness can be increased.

After completing the forging step (S20), the beryllium copper alloy wire (B) is subjected to a machining step (S30) is processed in the form of a plunger tip 100 through a cutting and cutting process.

The processing step (S30) is characterized in that it comprises a blow molding step (S31) and a thread processing step (S32).

The blow molding step S31 is a step of processing the beryllium copper alloy wire B, which is a base material of the plunger tip 100 used in the die casting machine, to process the shape of the plunger tip 100. That is, the hollow part 120 is formed by cutting the inside of the cylindrical beryllium copper alloy wire B through boring, etc., and the hollow part 120 having one side open and the hollow part 120 formed therein. Accordingly, the cross section of the plunger tip 100 is formed in an annular shape.

The thread processing step is a step in which the female thread 110 is processed on the open inner circumferential surface of the hollow part 120.

As shown in FIG . 6, a male thread (not shown) is processed on an outer circumferential surface of the plunger rod 200, so that the female thread 110 of the hollow part 120 and the male thread of the plunger rod 200 are not. H) are screwed together.

On the other hand, in order to facilitate screwing, the outer circumference of the plunger tip 100 in which the female screw thread 110 is formed may be formed in a square or hexagon, in order to form a hexagon as shown in the embodiment of FIG. The outer peripheral surface of the plunger tip 100 may be cut and processed into a hexagonal shape, and the internal thread 110 may be processed on the inner peripheral surface thereof.

As described above, when the forging step (S20) and the machining step (S30) is completed, the work for improving the hardness on the outer peripheral surface of the plunger tip 100 is required. That is, the heat treatment step (S40) is performed.

The heat treatment step (S40) is an age hardening heat treatment of the plunger tip 100, it is preferable to heat the processed plunger tip 100 to 300 ~ 350 ℃ age hardening heat treatment for 0.5 to 5 hours. At this time, the plunger tip 100 may be heated to 200 ~ 500 ℃ aging hardening heat treatment.

At this time, the heat treatment step (S40) of the plunger tip 100 can be shortened by a high temperature treatment in a short time, but the curing process after the pilot test in consideration of the cooling rate, curing rate, etc. according to the conditions of the furnace It is preferable.

The polishing step (S50) is a step of smoothly polishing the surface of the heat treated plunger tip 100 to finish.

As described above, the beryllium copper alloy plunger tip for die casting of the present invention includes the continuous casting step (S10), forging step (S20), processing step (S30), heat treatment step (S40) and polishing step (S50). It is manufactured by a method of manufacturing a beryllium copper alloy plunger tip for die casting.

Accordingly, the beryllium copper alloy plunger tip for die casting according to the present invention and a method of manufacturing the same may be manufactured using a beryllium copper alloy through a beryllium copper alloy continuous casting technique and heat treatment process optimization, thereby providing high thermal conductivity and heat. It has the advantage that it is possible to improve the life of the plunger tip by ensuring fatigue characteristics to prevent shortening of life due to heat load and high temperature corrosion.

In addition, the method of manufacturing the beryllium copper alloy plunger tip for die casting of the present invention has an advantage of improving the service life of the plunger tip by enabling the production of a high strength beryllium copper alloy wire having an outer diameter of 100 mm or more and a hardness of 400 HV or more.

In addition, the beryllium copper alloy plunger tip for die casting according to the present invention has the advantage of having abrasion resistance and lubricity even with frequent friction with a sleeve serving as a guide of the molten metal (M) in a die casting device, thereby delaying the replacement time.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

S10-S50: each step of the manufacturing method of the beryllium copper alloy plunge tip of this invention
B: Beryllium Copper Alloy Wire
100: Plunger Tip
110: female thread 120: hollow part
200: plunger rod
1000: horizontal continuous casting device
1100: melting furnace
1200: heater unit
1310 ~ 1340: Gas injection part
1400: cooling means
1500: Mold
1600: transfer unit
M: molten metal
2000: forging press

Claims (7)

Cooling furnace 1100, a heater unit 1200 for heating the molten metal M inside the melting furnace 1100, and a cooling path for cooling and solidifying the molten metal M by cooling a moving passage of the molten metal M with cooling water. The means (1400), the molten metal (M) and the molten solid (Shell) of the molten metal (M) that the temperature is reduced is introduced into the mold 1500 to provide the cast steel, and to take out the cast steel discharged from the mold 1500 In the method of manufacturing a beryllium copper alloy plunger tip for die casting using a horizontal continuous casting apparatus 1000 including a transfer unit 1600,
Deoxidation of the molten metal M by supplying argon (Ar) or nitrogen (N 2 ) gas to the gas injection units 1310, 1320, 1330, and 1340 formed in the melting furnace 1100 heated by the heater unit 1200. And a molten metal (M) purification step (S11) for controlling oxygen to a predetermined amount or less by removing impurities, an active metal addition step (S12) for adding an active metal to the purified molten metal (M), and a molten metal (M) at a predetermined cycle. Continuous casting step (S10) comprising a take-out step (S13) for casting a beryllium copper alloy wire (B) having a diameter of 100 ~ 110mm by adjusting the extraction speed of the ;
Forging step (S20) for cutting the cast beryllium copper alloy wire (B) to a predetermined length, heated to 820 ~ 870 ℃ hit the surface and forging in the forging press (2000);
Processing step (S30) of processing the beryllium copper alloy wire (B) in the form of the plunger tip 100 through a cutting and cutting process;
Heat treatment step (S40) for age-hardening the processed plunger tip 100:
Polishing step (S50) for polishing the surface of the plunger tip 100, the heat treatment; Including but not limited to:
The extraction step (S13) is
When taking out the cast through the operation of the transfer unit 1600, the take-out speed and the forward-retraction direction of the transfer unit 1600 has a certain cycle, the predetermined cycle is a two-stage repeated cycle of forward / stop, or forward / stop Method of producing a beryllium copper alloy plunger tip for die casting, characterized in that any one of three repetition cycles of / reverse, reverse / stop / forward .
delete delete delete The method of claim 1,
The heat treatment step (S40) is
Method of producing a beryllium copper alloy plunger tip for die casting, characterized in that the plunger tip 100 is heated to 300 ~ 350 ℃ aging hardening heat treatment for 0.5 to 5 hours.
The method of claim 1,
The processing step (S30) is
A hollow molding step (S31) in which a hollow portion 120 having one side open and a hollow is formed by cutting the cylindrical beryllium copper alloy wire B inside;
A method for manufacturing a beryllium copper alloy plunger tip for die casting, comprising: a thread processing step (S32) in which a female thread (110) is processed on an open inner circumferential surface of the hollow part (120).
The method according to any one of claims 1, 5 and 6 ,
A beryllium copper alloy plunger tip for die casting manufactured by the method of manufacturing the beryllium copper alloy plunger tip for die casting.
KR1020100109841A 2010-11-05 2010-11-05 Beryllium-cooper alloy plunger tip of die-casting machine and manufacturing method thereof KR101250852B1 (en)

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KR1020100109841A KR101250852B1 (en) 2010-11-05 2010-11-05 Beryllium-cooper alloy plunger tip of die-casting machine and manufacturing method thereof

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101630537B1 (en) 2014-12-10 2016-06-14 변길식 Plunger tips for die casting method

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KR101910015B1 (en) 2017-02-06 2018-10-19 (주)엠티에이 Iron-copper alloy having high thermal conductivity and method for manufacturing the same
KR102116006B1 (en) 2018-08-03 2020-05-27 (주)엠티에이 Platform for growing carbon materials having large area and method for growing carbon materials using the same
KR20180113487A (en) 2018-10-08 2018-10-16 (주)엠티에이 Iron-copper alloy having high thermal conductivity and method for manufacturing the same
KR102578486B1 (en) 2021-11-09 2023-09-14 (주)엠티에이 Iron-copper alloy having network structure and method for manufacturing the same

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Publication number Priority date Publication date Assignee Title
KR20020045177A (en) * 2000-12-08 2002-06-19 신현택 Plunger for die casting
KR100594369B1 (en) * 2004-04-08 2006-06-30 씨티코리아(주) Method for manufacturing the plunger tip of die-casting machine
KR100987704B1 (en) * 2008-02-29 2010-10-13 정경훈 Method of producing plunger tip for diecast machine

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
KR20020045177A (en) * 2000-12-08 2002-06-19 신현택 Plunger for die casting
KR100594369B1 (en) * 2004-04-08 2006-06-30 씨티코리아(주) Method for manufacturing the plunger tip of die-casting machine
KR100987704B1 (en) * 2008-02-29 2010-10-13 정경훈 Method of producing plunger tip for diecast machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101630537B1 (en) 2014-12-10 2016-06-14 변길식 Plunger tips for die casting method

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