A method of manufacturing a stainless steel hollow screw
A manufacturing method and stainless steel technology, applied in the field of vacuum obtaining equipment, can solve the problems of difficult casting, solidified carbon deposits in the medium, and difficult to process and manufacture, and achieve the effects of reducing production costs, improving yield, and simplifying manufacturing and casting difficulties.
Active Publication Date: 2017-07-28
威海智德真空科技有限公司
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Problems solved by technology
At present, the screws of screw vacuum pumps on the market are all solid structures. Due to the high temperature in the working chamber, it is easy to produce carbon deposits solidified by the medium, which seriously affects the service life of the vacuum pump.
The stainless steel hollow screw model is complicated to make and difficult to cast, and it is not easy to process and manufacture by traditional methods
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Embodiment Construction
[0013] Such as image 3 As shown, the stainless steel hollow screw is composed of a rod body 1 and a helical tooth 2, and the helical tooth 2 is a hollow structure, forming a cooling cavity of the screw.
[0014] The method of the present invention is the precision casting of the helical teeth of the stainless steel hollow screw rod in sections, and the process of welding and assembling process comprises the following steps:
[0015] 1. Divide the helical tooth shape of the whole screw into split hollow screw components with exactly the same shape and half the pitch, such as figure 2 As shown, precision casting is carried out;
[0016] 2. After the casting of the hollow screw assembly is completed, the stainless steel solution annealing treatment is carried out, mainly to remove the casting stress, refine and uniform the structure, and restore the corrosion resistance of the stainless steel.
[0017] 3. The hollow screw assembly processed in step 2 is assembled on the CNC a...
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The invention relates to vacuum obtaining equipment, in particular to a manufacturing method of a stainless steel hollow screw. The method includes the following steps: (1), divide the helical tooth shape of the whole screw into split hollow screw components with the same shape and one-half pitch, and carry out precision casting; (2), after the casting of the hollow screw component is completed, Carry out annealing treatment, pre-treatment of welding; (3), put the hollow screw assembly processed in step 2 on the special welding equipment, and carry out assembly argon shielded welding; when welding, rotate a hollow screw assembly along the helical direction to offset One-half pitch, aligned and welded with another hollow screw component cross-section; (4) After the hollow screw component is welded, the pressure test is carried out on the screw cooling cavity, and the stainless steel screw helical tooth profile is carried out after stress relief and tempering treatment Wire machining, that is, to manufacture hollow screw products. The method of the invention is simple, easy to operate and improves the casting yield.
Description
technical field [0001] The invention relates to vacuum obtaining equipment, in particular to a manufacturing method of a stainless steel hollow screw. Background technique [0002] The screw vacuum pump has been proved to be a dry vacuum pump with excellent performance. It has the advantages of low ultimate pressure, simple vacuum system, no medium in the working chamber, clean vacuum, wide application range, and environmental protection. It is more and more used in All walks of life, replacing traditional water ring vacuum pumps and oil-sealed vacuum pumps. At present, the screws of screw vacuum pumps on the market are all solid structures. Due to the high temperature in the working chamber, it is easy to produce carbon deposits solidified by the medium, which seriously affects the service life of the vacuum pump. The stainless steel hollow screw model is complicated to make and difficult to cast, and it is not easy to process and manufacture by traditional methods. Cont...
Claims
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IPC IPC(8): B23P15/00
Inventor 李乐忠
Owner 威海智德真空科技有限公司