CN1038038A - A kind of method of processing arch thin-wall case without mould - Google Patents
A kind of method of processing arch thin-wall case without mould Download PDFInfo
- Publication number
- CN1038038A CN1038038A CN 88105414 CN88105414A CN1038038A CN 1038038 A CN1038038 A CN 1038038A CN 88105414 CN88105414 CN 88105414 CN 88105414 A CN88105414 A CN 88105414A CN 1038038 A CN1038038 A CN 1038038A
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- pressure
- housing
- explosion
- mould
- wall case
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Motor Or Generator Frames (AREA)
Abstract
A kind of hydraulic pressure of processing arch thin-wall case does not have mould-forming process, belongs to design of pressure vessels and manufacturing field.General explosion-proof electric apparatus shell except carrying out the water pressure test, no longer carries out autofrettage after fine finishining, so in actual use, and housing be subjected to can exerting an influence after the power effect greater than the test pressure distortion of explosion-proof performance.The present invention is behind welding sequence, decides the hydraulic coupling of detected value with exceeding the quata housing is exerted pressure, and produces the shell arch form body structure surface of nature, increases casing rigidity and rigidity, reduces technical process.
Description
A kind of hydraulic pressure of processing arch thin-wall case does not have mould-forming process, belongs to the design and the manufacturing field of pressure vessel.
After the explosion suppresion surface fine finishining of general explosion-proof electric apparatus shell, must carry out the water pressure test of 1.0MPa, to check outer cover intensity and to be processed with zero defect, be not more than one as if dripping in 10 seconds and promptly be considered as qualified (referring to GB3836.2-83 " explosive atmosphere electric apparatus for explosive atmospheres flameproof electrical apparatus " d " " appendix A).For reaching this standard, shell must have enough wall thickness, but in the actual production, housing is no longer done the autofrettage of greater strength except that doing above-mentioned test.In actual use, after housing is subjected to effect greater than 1.0MPa power, the distortion of the explosion-proof performance that just may make a difference.Work in-process in addition, in order to eliminate welding stress, the explosion-proof electric apparatus housing also must be done the temper that needs to consume big energy.The explosion-proof electric apparatus case weight of processing is heavy like this, and strength and stiffness also are difficult to reach ideal value and process is many.
The objective of the invention is: in order to ensure the explosion-proof electric apparatus housing when the delivery test, do not destroy explosion-proof the precision and the anti-explosion safety coefficient of enhancing explosion-proof electric apparatus housing, and alleviate its weight, adopt a kind of unique moulding process processing method, make casing under same wall thickness situation, the shell arch form structure of pressure energy power in having comparatively ideal critical external compressive resistance and holding, thus casing anti-explosion safety coefficient improved significantly, alleviate case weight again effectively and eliminate welding stress.
The solution of the present invention is: before fine finishining behind the casing welding sequence, adopted the hydraulic coupling of specified test value multiple, and used the program of pressing-letting out-pressing-letting out to cavity fluid injection and tapping housing.Make housing form the shell arch form structure by plastic deformation.This technical process gives housing certain resistance to deformation prestressing force simultaneously, thereby increases the anti-explosion safety coefficient of housing.That is to say the welding prestressing force of under the situation of not making temper, having eliminated spuious distribution.This programme has reduced the manufacturing procedure and the energy consumption of explosion-proof electric apparatus housing, has reduced manufacturing cost.
Of the present invention being characterized as: behind the intact housing of welding processing, inject liquid according to certain speed toward cavity, apply the hydraulic coupling of setting, and keep a period of time, and then by certain speed, the liquid of releasing and injecting drops to setting with the hydraulic coupling that applies, and then rises to the force value of regulation again by certain speed.Several times are reduced to hydraulic coupling zero for the last time so repeatedly, allow cavity pass through the pressurized plastic deformation, form the shell arch form structural plane of nature.
Below in conjunction with example the present invention further is illustrated: the housing after welding processing is intact is connected as a single entity cavity and lid, as shown in Figure 1 with special quick-release card 1.Certain thickness sealing gasket 2 on pad in the middle of cavity and the lid is to guarantee its sealing.The pressure fluid of pressurized cylinder 3 outputs is according to 0.1～0.7kg/cm when fluid injection
2The compression rate of S injects cavity, makes cavity internal pressure reach 1.2～1.5 times of specified water pressure test pressures.After keeping a period of time, the special foot-operated pressure relieving valve 4 that tramps with one's feet is by 2～3kg/cm
2The S decompression rate discharges liquid.2～7 times so repeatedly, housing surface can form the shell arch form structural plane of nature.This structure can be under the situation that does not increase wall thickness, and external pressure strength in explosion-proof electric apparatus housing anti-is improved more than 1.5 times, and safety coefficient is brought up to more than 12 times by specified 8 times.Handle as surface of shell being added again beading or reinforcement, then effect is better.Fig. 1 is fluid injection, drainage schematic diagram.
Claims (1)
- A kind of method of processing arch thin-wall case without mould belongs to the design and the manufacturing field of pressure vessel, it is characterized in that: after housing processes, by 0.1～0.7kg/cm 2S speed is forced into 1.2～1.5 times of specified hydraulic test pressure values to cavity, after maintenance a period of time, presses 2～3kg/cm with foot-operated special foot-operated pressure relieving valve 2The pressure release of S decompression rate 2～7 times repeatedly, makes pressure reduce to zero at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105414 CN1013088B (en) | 1988-05-24 | 1988-05-24 | Method for processing arch thin-wall case without mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105414 CN1013088B (en) | 1988-05-24 | 1988-05-24 | Method for processing arch thin-wall case without mould |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1038038A true CN1038038A (en) | 1989-12-20 |
| CN1013088B CN1013088B (en) | 1991-07-10 |
Family
ID=4833608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88105414 Expired CN1013088B (en) | 1988-05-24 | 1988-05-24 | Method for processing arch thin-wall case without mould |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013088B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1125085C (en) * | 2000-11-08 | 2003-10-22 | 福州大学 | Process and equipment for preparing special dextrin |
| CN100999053B (en) * | 2006-12-29 | 2010-10-06 | 山东齐鲁电机制造有限公司 | Convex type electric generator casing group welding technology |
| CN104916342A (en) * | 2015-05-11 | 2015-09-16 | 中国科学院上海应用物理研究所 | Method for concentrating uranium from water solution with uranyl ions |
| CN104923167A (en) * | 2015-07-10 | 2015-09-23 | 山东大学 | Preparing method of stable nanometer SiO2/tributyl phosphate composite adsorbing material |
| CN105936824A (en) * | 2016-04-06 | 2016-09-14 | 深圳多元拓展环保科技有限公司 | Soil heavy metal activator and preparation method and application thereof |
| CN107655746A (en) * | 2017-11-02 | 2018-02-02 | 山东交通学院 | A kind of dynamic characteristic test apparatus of spiral case inner chamber pressure-bearing |
-
1988
- 1988-05-24 CN CN 88105414 patent/CN1013088B/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1125085C (en) * | 2000-11-08 | 2003-10-22 | 福州大学 | Process and equipment for preparing special dextrin |
| CN100999053B (en) * | 2006-12-29 | 2010-10-06 | 山东齐鲁电机制造有限公司 | Convex type electric generator casing group welding technology |
| CN104916342A (en) * | 2015-05-11 | 2015-09-16 | 中国科学院上海应用物理研究所 | Method for concentrating uranium from water solution with uranyl ions |
| CN104923167A (en) * | 2015-07-10 | 2015-09-23 | 山东大学 | Preparing method of stable nanometer SiO2/tributyl phosphate composite adsorbing material |
| CN104923167B (en) * | 2015-07-10 | 2017-01-04 | 山东大学 | A kind of stable Nano-meter SiO_22the preparation method of/tributyl phosphate composite adsorbing material |
| CN105936824A (en) * | 2016-04-06 | 2016-09-14 | 深圳多元拓展环保科技有限公司 | Soil heavy metal activator and preparation method and application thereof |
| CN107655746A (en) * | 2017-11-02 | 2018-02-02 | 山东交通学院 | A kind of dynamic characteristic test apparatus of spiral case inner chamber pressure-bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1013088B (en) | 1991-07-10 |
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| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |