CN101077524A - Powder metallurgy warm-pressing system heating method - Google Patents
Powder metallurgy warm-pressing system heating method Download PDFInfo
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- CN101077524A CN101077524A CN 200610070122 CN200610070122A CN101077524A CN 101077524 A CN101077524 A CN 101077524A CN 200610070122 CN200610070122 CN 200610070122 CN 200610070122 A CN200610070122 A CN 200610070122A CN 101077524 A CN101077524 A CN 101077524A
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Abstract
The present invention relates to heating process for warm pressing powder metallurgical process includes the following steps: mixing powder material and preheating, preheating mold, pressing green compact, sintering green compact, cooling product, and post treating. It features the product cooling step with protective gas introduced into the cooling section of the sintering furnace to cool the workpiece to about 300 deg.c. The heated protective gas is collected, compressed with an air compressor and maintained in a high pressure tank, and the high temperature and high pressure protecting gas is jetted to mix material powder and preheat the mold. The present invention possesses the circular utilization of the protecting gas, and has the advantages of lowered power consumption, reduced production cost, raised production efficiency, homogeneous mixing of the powder material and homogeneous temperature distribution.
Description
Technical field:
The present invention relates to a kind of powder metallurgy warm-pressing system heating method.
Background technology:
Powder metallurgy adopts temperature-pressure formation can obtain high density high-performance iron-based powder metallurgy parts.The powder metallurgy warm-pressing forming technology is general through following operation: mix powder, powder heating, mould and die preheating, green compact compacting, green sintering, goods cooling and post processing etc.But the workpiece that sintering is crossed discharges a large amount of heat energy in temperature-fall period, utilizes the recirculated water in the water jacket to cool off at present, and water processing establishment takes up room bigger, and expense is higher, and environment is caused certain pollution, especially the energy is caused huge waste.Whether is there more economical effective method to provide thermal source, simultaneously to the processing that cools of sintering workpiece for the powder metallurgy warm-pressing heating system? extensively retrieve at the problems referred to above, still find no desirable technical scheme.
Summary of the invention:
Purpose of the present invention is exactly the high shortcoming of equipment cost height, energy consumption that exists in the existing powder metallurgy warm-pressing system for overcoming; and a kind of new method that proposes; the sintered metal product that promptly utilizes protective gas as medium firm sintering to be crossed carries out cooling processing; thereby absorb the waste heat that the sintered article cooling produces, and be used for warm-pressing system heating powder, mixed-powder and preheated mold.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of powder metallurgy warm-pressing system heating method; it comprises following master operation: mix operations such as powder and powder preheating, mould and die preheating, green compact compacting, green sintering, goods cooling, post processing; it is characterized in that in the goods refrigerating work procedure; to the sintering furnace temperature descending section, feed protective gas from an end goods are lowered the temperature (cooling back products temperature is about 300 ℃), collect the protective gas that had been heated from the other end.Flow, the time of the protective gas that feeds can be according to concrete technological requirement respective settings.Described protective gas is to prevent workpiece material powder composition oxidized gas in technical process, as nitrogen N
2, carbon dioxide CO
2, cracked ammonium (75% nitrogen N
2+ 25% hydrogen H
2), helium He, argon Ar etc.Preferably adopt nitrogen from economy and security consideration, about pressure 0.12MPa.
For abundant recycling heat energy, the protective gas that was heated can be pressurizeed by air compressor, be delivered in the high pressure tank stand-by then.Described high-pressure gas jar structure can divide three layers, and internal layer is the high temperature gas-bearing reservoir, and the middle level is oil reservoirs, and skin is the low temperature gas-bearing reservoir.This kind arrangement is in order to reach the effect of energy storage buffer.Pressure in the high pressure tank will feed in the internal layer through the high-temperature gas that reaches after the pressurization about 400 ℃ about 0.4Mpa, absorbs gas pressurized institute thermal discharge by the intermediate layer heat exchanger, about oily temperature rise to 300 ℃.
Adopt the protective gas of HTHP in the air accumulator that the starting powder of filling a prescription is sprayed, starting powder is mixed and heating simultaneously, simultaneously mould is carried out preheating, generally be easy to be controlled in the 130-150 ℃ of scope.
The invention has the advantages that: make full use of waste heat and energy-conservation; The temperature adjusting range is wide, and control is sensitive; Simple in structure, easy to operate; Powder uniformity height, uniformity of temperature profile and accurately; Adjustable for the powder amount; Low cost of manufacture, 1/10 of not enough import equipment helps advanced powder metallurgy warm-pressing forming technology and warm flow compaction forming technology and applies.Adopt protective gas as heat transfer medium, supporting equipment simple, and can recycle very easily, significantly reduce energy resource consumption, and reduce the input that is equipped with water processing establishment, and then reduce cost and enhance productivity.
For the present invention is described in further detail, one embodiment of the present of invention are provided below.
The specific embodiment:
Embodiment: main step is:
1, the high temperature sintering products temperature is about 1280 ℃, and the workpiece that sintering is finished transfers to the sintering furnace temperature descending section, and the gate of closing sintering furnace temperature descending section front and back makes this section be in sealing state.The nitrogen N that adopts air separation machine equipment to produce
2, pressure 0.12MPa feeds in the sintering furnace temperature descending section from low-temperature end, takes the nitrogen N that heated away from temperature end
2, after 20-30 minute, workpiece is cooled to 300 ℃, goes to down postprocessing working procedures one.
2, take the nitrogen N that heated away from the sintering furnace temperature descending section
2,, send in the high pressure tank and (, can use high pressure tank in parallel), along with the injection of gas, nitrogen N according to the requirement of gas-storing capacity by the air compressor pressurization
2Temperature reaches about 400 ℃, and pressure is about 0.4Mpa.Absorb gas pressurized institute thermal discharge by the intermediate layer heat exchanger, about oily temperature rise to 300 ℃, finish the gas storage work of high pressure tank.As also continuing gas storage, then use other high pressure tank in parallel.
3, from high pressure tank, emit the HTHP nitrogen N
2, it is fed injection stirring and heating powder raw material in the mixed powder machine, powder stock is heated to about 140 ℃.To lower the temperature to some extent in the gases at high pressure dispose procedure, but the high temperature oil in the oil reservoirs discharges the part heat by heat exchanger, make the protective gas temperature remain on 300 ℃.Another part nitrogen N
2Feed mould, be heated about 135 ℃.
Claims (7)
1, a kind of powder metallurgy warm-pressing system heating method; it comprises following master operation: mix powder and powder heating, mould and die preheating, green compact compacting, green sintering, goods cooling, post processing; it is characterized in that in the goods refrigerating work procedure; feed protective gas from an end to the sintering furnace temperature descending section goods are lowered the temperature, collect the protective gas that had been heated from the other end.
2, powder metallurgy warm-pressing system heating method according to claim 1 is characterized in that described protective gas can be a nitrogen N
2, carbon dioxide CO
2, cracked ammonium (75% nitrogen N
2+ 25% hydrogen H
2), a kind of among the helium He, argon Ar.
3, according to claim 1,2 described powder metallurgy warm-pressing system heating methods, it is characterized in that adopting air compressor to collect the gas that was heated, be delivered in the high pressure tank stand-by then.
4, powder metallurgy warm-pressing system heating method according to claim 3 is characterized in that being provided with in the high pressure tank medium oil of heat energy storage.
5, powder metallurgy warm-pressing system heating method according to claim 3 is characterized in that adopting protective gas that the starting powder of prescription is sprayed, and starting powder is mixed.
6, powder metallurgy warm-pressing system heating method according to claim 3 is characterized in that adopting high temperature protection gas directly to feed mixed powder, and mixed-powder is heated.
7, powder metallurgy warm-pressing system heating method according to claim 3 is characterized in that adopting high temperature protection gas that mould is carried out preheating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610070122 CN101077524A (en) | 2006-11-09 | 2006-11-09 | Powder metallurgy warm-pressing system heating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610070122 CN101077524A (en) | 2006-11-09 | 2006-11-09 | Powder metallurgy warm-pressing system heating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101077524A true CN101077524A (en) | 2007-11-28 |
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|---|---|---|---|
| CN 200610070122 Pending CN101077524A (en) | 2006-11-09 | 2006-11-09 | Powder metallurgy warm-pressing system heating method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103695794A (en) * | 2013-12-24 | 2014-04-02 | 舒思雄 | Balance block for compressor and manufacturing method for balance block |
| CN111872382A (en) * | 2019-10-28 | 2020-11-03 | 张家港振江粉末冶金制品有限公司 | Powder metallurgy method for copper product |
-
2006
- 2006-11-09 CN CN 200610070122 patent/CN101077524A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103695794A (en) * | 2013-12-24 | 2014-04-02 | 舒思雄 | Balance block for compressor and manufacturing method for balance block |
| CN111872382A (en) * | 2019-10-28 | 2020-11-03 | 张家港振江粉末冶金制品有限公司 | Powder metallurgy method for copper product |
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