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A mold for manufacturing a screw rotor by additive technology and its application method

A screw and rotor technology, applied in the field of molds for manufacturing screw rotors through additive technology, can solve problems such as difficulty in mold manufacturing, inability to fully guarantee accuracy, and difficulty in positioning, and achieve the effects of saving development time, good solidification effect, and simple process

Active Publication Date: 2022-04-19
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The turning method to process the screw requires a five-axis linkage CNC machine tool, which requires particularly high machining accuracy. The accuracy requirements cannot be fully guaranteed during the processing and assembly process. The screw needs to be milled after turning, but there are difficulties in positioning and low accuracy. And other issues
Screw rotors can also be processed by casting. At present, screw castings are generally cast with green sand or resin sand, but the obtained screw rotors are prone to defects such as shrinkage cavities, shrinkage porosity, subcutaneous pores, and graphite floating, and the casting rejection rate is high. , the economic benefit is low, and the casting process also has the inevitable shortcomings of difficult mold manufacturing and low precision

Method used

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  • A mold for manufacturing a screw rotor by additive technology and its application method
  • A mold for manufacturing a screw rotor by additive technology and its application method
  • A mold for manufacturing a screw rotor by additive technology and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A mold for manufacturing screw rotors through additive technology, which is characterized in that it includes a receiving platform 4 and a mold 2. The mold 2 is provided with a molding cavity 5 that runs through its upper and lower sides, and the receiving platform 4 and the mold 2 are arranged on the same axis. Above, the receiving platform 4 and the mold 2 can move back and forth along the central axis and rotate around the axis, and the cross-sectional shape of the molding cavity 5 is the shape of the rotor profile of the screw rotor 3 to be produced.

[0029] The shape of the inner cavity of the molding cavity 5 is a part of the outer shape of the screw rotor 3 to be made. The shape of the inner cavity of the forming cavity 5 is 0.15 circles of a complete spiral on the external shape of the screw rotor 3 to be produced. A cooling water channel 6 is arranged in the mold 2 , and the cooling water channel 6 is arranged around the forming cavity 5 . The mold 2 is also ...

Embodiment 2

[0032] A method for using the above-mentioned mold for manufacturing a screw rotor through additive technology, comprising the following steps:

[0033] Step 1. Move the receiving platform 4 to be close to the mold 2, and heat the mold 2 to the working temperature of 200-300°C; at the same time, the injection barrel 1 can be heated at the same time to ensure the fluidity of the material;

[0034] Step 2, injecting molten molding material into the mold 2; injecting cooling water into the cooling channel 6 to keep the mold 2 at working temperature;

[0035] Step 3: After filling the material, continue to inject the material, and at the same time keep the receiving platform 4 away from the model 2 and rotate relatively; Corresponding to the lead;

[0036] Step 4: Continue step 3 until the screw to be manufactured is completed, stop the line-to-line movement between the injection and receiving platform 4 and the mold 2, and take it off after cooling.

[0037] The realization pri...

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PUM

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Abstract

The invention discloses a mold for manufacturing a screw rotor through additive technology and a method for using the mold. The mold includes a receiving platform and a mold. On the axis, at least one of the receiving platform and the model can move back and forth along the central axis, and at least one of the receiving platform and the model can rotate around the central axis. The shape of the rotor profile. Compared with the prior art, the present invention has the following advantages: simple, easy to operate, cost saving, no problems such as difficult positioning and low precision in ordinary processing; the process is smooth without sputtering, and the solidification effect is good; the screw rod is elongated in this solution , The process of liquid pouring and solidification occurs simultaneously until the required screw rotor is formed. The process is simple and the yield is high.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, in particular to a mold for manufacturing a screw rotor through an additive technology and a method for using the same. Background technique [0002] Screw pumps are more and more used in vacuum coating, semiconductor and other industries due to their cleanness and oil-free, high transmission efficiency and high ultimate vacuum. The market demand for screw pumps is increasing. The monopoly of giant companies makes the domestic research on screw pumps start slowly, and the independent research and development capabilities are weak, which also makes the prospect of screw pumps in China very broad. [0003] At present, screw processing methods include turning, milling, casting and their composite processing methods, but these basically have various problems. The turning method to process the screw requires a five-axis linkage CNC machine tool, which requires particularly high machi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/04B33Y10/00B33Y30/00
CPCB22D11/0405B22D11/009B33Y30/00B33Y10/00
Inventor 干蜀毅李斌余清州冯绅绅高明燚舒晓冬
Owner HEFEI UNIV OF TECH