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Vacuum degreasing sintering molding method

A technology of vacuum degreasing and sintering molding, which is applied in the field of industrial furnaces, and can solve the problems of incomplete removal of vapor wax, pollution of the furnace body and sintering quality, etc.

Active Publication Date: 2021-01-15
ZHUZHOU XINRONGLI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a vacuum degreasing sintering molding method, which aims to solve the problems of furnace body pollution and low sintering quality caused by incomplete removal of vapor wax generated in the dewaxing stage of the sintering process

Method used

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  • Vacuum degreasing sintering molding method

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0050] 1) Loading: put the aluminum alloy billet to be sintered into the effective heating zone 112 of the vacuum degreasing sintering furnace 100:

[0051] 2) Vacuuming: Vacuumizing the vacuum degreasing sintering furnace 100 and the wax trap group 200 until the pressure is 6 Pa;

[0052] 3) Degreasing: Inert gas is introduced into the vacuum degreasing sintering furnace 100, heated from room temperature to 500° C. at a heating rate of 2° C. / min, kept for 1 hour, and vacuumed at the same time. Detect the air pressure of the overflow area 113 and the air pressure of the wax trap group 200, and adjust the flow rate of the inert gas and the vacuum degree of the wax trap group so that the difference between the air pressure of the overflow area 113 and the wax trap group 200 Keep at 15 kPa, the vapor wax produced in the effective heating zone 112 follows the inert gas and enters the wax trapping tank group 200 through the wax trapping pipeline 114;

[0053] 4) high temperature s...

specific Embodiment 2

[0058] 1) Loading: put the alumina blank to be sintered into the effective heating zone 112 of the vacuum degreasing sintering furnace 100:

[0059] 2) Vacuuming: Vacuumizing the vacuum degreasing sintering furnace 100 and the wax trap group 200 until the pressure is 10 Pa;

[0060] 3) Degreasing: Introduce nitrogen gas into the vacuum degreasing sintering furnace 100, heat from room temperature to 600°C at a heating rate of 4°C / min, keep it warm for 1.5 hours, and pump vacuum at the same time. Detect the air pressure of the overflow area 113 and the air pressure of the wax trap group 200, and adjust the flow of nitrogen and the vacuum degree of the wax trap group so that the difference between the air pressure of the overflow area 113 and the wax trap group 200 remains At 20 kPa, the vapor wax produced in the effective heating zone 112 enters the wax trap group 200 through the wax trap pipeline 114 along with the nitrogen gas;

[0061] 4) high temperature sintering;

[0062...

specific Embodiment 3

[0066] 1) Loading: Put the stainless steel billet to be sintered into the effective heating zone 112 of the vacuum degreasing sintering furnace 100:

[0067] 2) Vacuuming: Vacuumizing the vacuum degreasing sintering furnace 100 and the wax trap group 200 until the pressure is 15 Pa;

[0068] 3) Degreasing: Inert gas is introduced into the vacuum degreasing sintering furnace 100, heated from room temperature to 500°C at a heating rate of 2°C / min, and kept at a temperature of 1 hour, while vacuuming, and detecting the air pressure and wax capture in the overflow area 113 The air pressure of the tank group 200, and the flow rate of the inert gas is adjusted and the vacuum degree of the wax trap group is adjusted so that the difference between the air pressure of the overflow area 113 and the gas pressure of the wax trap group 200 remains at 25 kPa, and the effective heating zone 112 The vapor wax produced in the interior follows the nitrogen gas and enters the wax-catching tank g...

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Abstract

The invention provides a vacuum degreasing and sintering formation method. The method comprises the steps of feeding; vacuumizing; degreasing, wherein flow carrying gas is introduced into a vacuum degreasing and sintering furnace, temperature rising and vacuumizing are carried out according to the preset degreasing temperature rise curve, gas pressure of an overflowing and dispersing area and gaspressure of a wax capturing tank set are detected, by adjusting flow of the flow carrying gas and adjusting the vacuum degree of the wax capturing tank set, thus the differential value between the gaspressure of the overflowing and dispersing area and the gas pressure of the wax capturing tank set is kept within the pressure difference range, and steam wax generated in an effective heating area follows the flow carrying gas to enter the wax capturing tank set; and high-temperature sintering and cooling. In the technical scheme, the flow of the flow carrying gas and the vacuum degree of the wax capturing tank set are controlled according to the gas pressure of the overflowing and dispersing area and the effective heating area, thus the steam wax in the effective heating area can directly enter the wax capturing tank set without passing through the inner wall of a furnace cylinder body, compared with the prior art, the steam wax collecting effect is better, pollution to the furnace bodycan be reduced effectively, and the influence on the blank sintering quality of the next time is reduced.

Description

technical field [0001] The invention relates to the technical field of industrial furnaces, in particular to a vacuum degreasing and sintering molding method. Background technique [0002] The conventional dewaxing process is to install a vertical or horizontal wax trap outside the furnace. The horizontal wax trap is directly connected to the lower part of the furnace wall and connected to the vertical wax trap. One side of the vertical wax trap is connected to a vacuum pump group. During the sintering process, the vacuum pump continuously evacuates the furnace body; the temperature in the furnace body rises, and the binder and molding agent are gradually vaporized, which are drawn out by the vacuum pump unit and condensed in the wax trap through the cooling system. [0003] Although the traditional dewaxing equipment can store most of the binder or forming agent in the wax trap, since the binder or forming agent exists in the form of gas in the high-temperature furnace body...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/10
CPCB22F3/1021
Inventor 朱诗坤盛利文盛建华戴金宁
Owner ZHUZHOU XINRONGLI IND
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