CN101402150B

CN101402150B - Aluminum impeller air brazing process

Info

Publication number: CN101402150B
Application number: CN2008101220075A
Authority: CN
Inventors: 沈音; 贺北平
Original assignee: HANGZHOU HANGYANG COMPRESSOR CO Ltd
Current assignee: HANGZHOU HANGYANG COMPRESSOR CO Ltd
Priority date: 2008-10-22
Filing date: 2008-10-22
Publication date: 2011-05-11
Anticipated expiration: 2028-10-22
Also published as: CN101402150A

Abstract

The invention discloses an air brazing technology for an aluminum impeller. Firstly, a finished aluminum impeller is cleaned by weak base, weak acid and clear water, an oxidation film on the aluminum impeller is removed, and a wheel disk and a wheel cover are compounded; and a clearance, namely a welding seam is reserved between compounding surfaces, an aluminum alloy brazing flux is coated at the welding seam, an aluminum brazing wire is placed on the welding seam, technological equipment is used to place the aluminum impeller into a preheated furnace for impeller preheating first and temperature-rise brazing then, and the aluminum impeller is taken out of the furnace and cooled when the brazing temperature is reached and the brazing wire is melted and then is cleaned by a chromic anhydride solution and the clear water to finish the whole brazing process. The air brazing technology has the characteristics of high quality, high efficiency, low cost, low energy consumption, low pollution and so on.

Description

Aluminum impeller air brazing process

Technical field

What the present invention relates to is a kind of soldering processes of aluminium impeller, especially a kind ofly is applicable to aluminum impeller air brazing process in the decompressor.

Background technology

In the prior art, what the equipment of aluminium impeller salt bath brazing adopted is salt bath, and it is a crucible in fact, employed electrode is with graphite or stainless steel, and it is that whole workpiece is immersed saline solution high temperature heating soldering, and saline solution is a heat-conducting medium, be again brazing flux, must make regular check on composition and impurity content.This soldering processes have heating rapidly, and temperature is even, the production efficiency height, and saline solution media protection workpiece is not oxidated, is applicable to the continuity production in enormous quantities; But the weak point of this technology is the cost height, power consumption big (can not intermittently use), the fused salt steam is seriously polluted, and heating process can be sent toxic gas, in brazing process, the electromagnetism ringing also may make workpiece dislocation or solder misplace, influence brazing quality, therefore want recruitment to put into the reliable location of row, and these used tool structure complexity, versatility is poor, and cost is higher.

Summary of the invention

The objective of the invention is to overcome the deficiency that prior art exists, and provide a kind of high-quality and high-efficiency, low cost, low energy consumption, oligosaprobic aluminum impeller air brazing process.This technology at first is that manufactured aluminium impeller is cleaned up with weak base, weak acid and clear water, remove the oxide-film on the aluminium impeller, wheel disc, wheel cap is compound, and to make composite surface leave the gap be weld seam, coat aluminum alloy brazing flux in the commissure, and put thread almit, the aluminium impeller is put in the middle of the stove of preheating with frock, carry out the impeller preheating earlier, the soldering that heats up then is when arriving brazing temperature, come out of the stove during the solder fusing, cooling cleans up with chromic anhydride solution and clear water again, finishes whole brazing process.

The further soldering processes of the present invention are: with the moulding of aluminium Impeller Machining, press special process, wheel disc, wheel cap are adjusted to predetermined gap; Weld preceding cleaning then, preferred weak base is that 10% NaOH cleans, and preferred weak acid is that 14% weak salpeter solution cleans; Rinse well with clear water at last; Assemble again, on composite surface, coat preferred QJ207 brazing flux, put L400 silk solder, workpiece is placed on the frock; Carry out soldering then, temperature is 650 ℃ in the stove, puts in the middle of the stove, and 600 ℃ of temperature are incubated 15 minutes, and stove is warming up to 680 ℃, and about 16 minutes, the solder fusing was come out of the stove; Carry out postwelding at last and clean, cooling is 20 minutes in air, puts into cold water and washes, and puts into 2% chromic anhydride solution cleaning then, and the back cleans up with clear water.

The invention belongs to a kind of improvement to existing soldering processes, it has high-quality and high-efficiency, low cost, low energy consumption, characteristics such as low pollution.

Description of drawings

Fig. 1 is workpiece of the present invention carries out soldering in stove a tool structure schematic diagram.

The specific embodiment

The present invention will be described in detail below in conjunction with the accompanying drawings and the specific embodiments: the present invention uses weak base with manufactured aluminium impeller 1, weak acid and clear water clean up, this aluminium impeller is a workpiece, remove the oxide-film on the aluminium impeller, with wheel disc, wheel cap is compound, and to make composite surface leave the gap be weld seam, coat aluminum alloy brazing flux in the commissure, and put thread almit, and carry out soldered into position 4 with stove 3 centres that frock 2 is put into preheating with aluminium impeller 1, carry out the impeller preheating earlier, soldering then heats up, when arriving brazing temperature, come out of the stove cooling during the solder fusing, clean up with chromic anhydride solution and clear water again, finish whole brazing process.

Embodiment 1: the aluminium Impeller Machining is shaped to diameter of phi 130mm, and material selection LD2 presses special process, and wheel disc, wheel cap are adjusted to predetermined gap; Weld preceding cleaning then, preferred weak base is that 10% NaOH cleans, and preferred weak acid is that 14% weak salpeter solution cleans; Rinse well with clear water at last; Assemble again, on composite surface, coat preferred QJ207 brazing flux, put L400 silk solder, workpiece is placed on the frock; Carry out soldering then, temperature is 650 ℃ in the stove, puts in the middle of the stove, and 600 ℃ of temperature are incubated 15 minutes, and stove is warming up to 680 ℃, and about 16 minutes, the solder fusing was come out of the stove; Carry out postwelding at last and clean, cooling is 20 minutes in air, puts into cold water and washes, and puts into 2% chromic anhydride solution cleaning then, and the back cleans up with clear water.

Because the present invention is a kind of improvement to prior art, therefore, brazing flux used in the prior art, silk solder, aluminium, cleaning fluid etc. all are applicable to the replacement of the foregoing description 1 and become other embodiment of the present invention; And the temperature of furnace temperature and workpiece heating can reasonably be selected according to selected brazing flux, silk solder etc.; and do not need to make any creative work on this basis that is chosen in the embodiment of the invention 1; therefore protection scope of the present invention is not limited to the content of the foregoing description, and every real-time mode that can access on the foregoing description basis is all within protection scope of the present invention.

Claims

1. aluminum impeller air brazing process, this technology at first is that manufactured aluminium impeller is cleaned up with weak base, weak acid and clear water, remove the oxide-film on the aluminium impeller, wheel disc, wheel cap is compound, and make composite surface leave the gap to be weld seam, to coat aluminum alloy brazing flux in the commissure, and put thread almit, the aluminium impeller is placed on the frock, and put into together in the middle of the stove of preheating, temperature is 650 ℃ in the stove; When 600 ℃ of aluminium impeller temperature, insulation is 15 minutes in the stove, and stove is warming up to 680 ℃ then, and about 16 minutes, the solder fusing was come out of the stove; Carry out postwelding at last and clean, cooling is 20 minutes in air, puts into cold water and washes, and puts into 2% chromic anhydride solution cleaning then, and the back cleans up with clear water, finishes whole brazing process.

2. aluminum impeller air brazing process according to claim 1, cleaning before it is characterized in that welding and selecting weak base for use is 10% NaOH, selecting weak acid for use is 14% weak salpeter solution; The aluminum alloy brazing flux of coating in the commissure is selected the QJ207 brazing flux for use, and the thread almit of putting is selected L400 silk solder for use.