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Vacuum brazing method, sprue bush and die core

A brazing method and a technology of a vacuum brazing furnace, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of complex processing of cooling channels, poor quality of formed parts, and easy water leakage, etc., and achieve Improve quality and production efficiency, good brazing effect, good brazing quality effect

Inactive Publication Date: 2015-11-11
江西优信普科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of the sprue sleeve is small. Generally, the water-proof sleeve is set outside the sprue sleeve by die-casting to form a cooling channel on the sprue sleeve. However, the die-casting method has poor sealing performance and is prone to water leakage at high temperatures. , thus affecting the performance of the sprue sleeve
The structure of the mold core is generally complicated, and the processing of the cooling water channel is complicated. It is difficult to design a water channel with a better cooling effect on the mold core, resulting in poor product quality and low production efficiency of the molded parts.

Method used

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  • Vacuum brazing method, sprue bush and die core
  • Vacuum brazing method, sprue bush and die core
  • Vacuum brazing method, sprue bush and die core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as figure 1 Shown, a kind of vacuum brazing method comprises the following steps:

[0055] S110: performing pretreatment on the parts to be brazed, setting brazing material on at least one of the two matching surfaces to be brazed, so that the two matching surfaces to be brazed are fully fitted for assembly, and Place the assembled parts to be brazed into a vacuum brazing furnace.

[0056] Further, the pretreatment of the parts to be brazed includes finishing the surface to be brazed, so that the unevenness gap between the two matching surfaces to be brazed is kept within the range of 0.4 mm, so that the surface to be brazed is The welding seam is tight; the parts to be brazed are cleaned to improve the brazing quality of the brazed parts.

[0057] S120: When the vacuum degree in the vacuum brazing furnace is less than or equal to 5×10 -3 The temperature starts to rise at Pa, and the temperature in the vacuum brazing furnace is heated by a stepwise heating metho...

Embodiment 2

[0077] The difference from the first implementation is that in step S120, the stepwise temperature rise method is used to heat the temperature in the vacuum brazing furnace, so that the internal temperature is gradually heated to 40°C-50°C higher than the melting point of the solder, specifically including the following steps :

[0078] Heat the vacuum brazing furnace for 45 minutes to raise the temperature to 450°C and keep it warm for 30 minutes;

[0079] Heat the vacuum brazing furnace for 50 minutes to raise the temperature to 950°C and keep it warm for 50 minutes;

[0080] Heat the vacuum brazing furnace for 45 minutes to raise the temperature to 1050° C. and keep it warm for 50 minutes.

[0081] Using the above values ​​to heat the parts to be brazed in steps, the outer side of the surface to be brazed of the obtained brazed parts has a uniform silvery color, the appearance of the brazing seam is continuous, the quality is good, and the yield is high. The hydrostatic t...

Embodiment 3

[0083] This embodiment is a sprue sleeve obtained by the above-mentioned vacuum brazing method. Such as Figure 4 , Figure 5 , Figure 6 As shown, a sprue sleeve includes an inner sleeve 100 and an outer sleeve 200, the upper part of the inner sleeve 100 is processed with a cylindrical boss 110, and a circulating cooling water channel 120 is opened on the inner sleeve 100, so The circulating cooling water channel 120 includes an annular groove 121 arranged on the upper part of the cylindrical boss 110, and two first water channels 122 extending from the lower side of the annular groove 121 to the lower part of the cylindrical boss 110, the outer part The sleeve 200 is sleeved on the outer periphery of the cylindrical boss 110 , and the outer sleeve 200 and the inner sleeve 100 are brazed by the vacuum brazing method described above. Further, the upper end of the cylindrical boss 110 is provided with a first brazing groove 112, and the lower end of the outer part cover 200 ...

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Abstract

The invention discloses a vacuum brazing method, a sprue bush and a die core. The vacuum brazing method includes the following steps that pretreatment is conducted on brazing parts; the temperature starts to rise when the vacuum degree in a vacuum brazing furnace reaches 5*10<-3> Pa, the interior of the vacuum brazing furnace is heated through a step-wise temperature rising method, the interior of the vacuum brazing furnace is heated to exceed the brazing filler metal melting temperature by 40 DEG C to 50 DEG C, and the vacuum degree in the vacuum brazing furnace is kept between 2.7*10<-2> Pa to 8*10<-3> Pa; nitrogen or inert gas is introduced into the vacuum brazing furnace to cool the parts in the air to below 100 DEG C, and the parts are taken out; and deep-cooling treatment and tempering treatment are conducted on the taken parts. By means of the vacuum brazing method, the sprue bush and the die core, the parts are integrated, good in brazing quality and good in airtightness. The sprue bush and the die core are good in airtightness, the temperature can be adjusted and controlled quickly and effectively, and the quality of die forming products and production efficiency are improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a vacuum brazing method, a sprue sleeve and a mold core. Background technique [0002] The vacuum brazing process refers to the heating of workpieces in a vacuum chamber, which is mainly used for welding of high-quality products and easily oxidized materials. Traditionally, the vacuum brazing process is widely used in plate-fin heat exchangers and coolers in air separation equipment, petrochemical equipment, vehicles, ships, and household appliances. In the field of mold injection molding, vacuum brazing technology is generally involved. However, the mold is generally in a high mold temperature working environment, and the quality and precision of the molded parts are required to be high. The brazing quality of the parts produced by the traditional brazing process is not high, especially when it is under high temperature conditions for a long time. Poor, poor durability. [0...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K35/30B29C45/27B29C33/76
CPCB23K1/0008B23K1/008B23K1/20B23K35/0244B23K35/304B29C33/76B29C45/2602B29C45/2708
Inventor 陈文清陈文渊
Owner 江西优信普科技有限公司
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