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Dewaxing casting method for drill bit

A technology of lost wax casting and drill bits, which is applied in the direction of casting molding equipment, molds, and mold components. It can solve the problems of uncontrollable drill bit processing errors, inability to accurately process workpieces, and poor shell strength, so as to reduce mechanical processing. Efforts to reduce workload, improve consistency and work efficiency, and increase coating performance

Inactive Publication Date: 2017-07-25
宁波神钻工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of science and technology, the workpiece has higher and higher requirements for machining accuracy. However, the existing drill bit adopts the general casting method, which often has the problems of low machining accuracy and large error, and cannot accurately process the workpiece.
Chinese patent application (CN103752907A) discloses a hollow drill bit and a preparation method thereof, which are prepared by machining, surfacing, quenching and tempering heat treatment, and vacuum coating antirust treatment. The advantages of not easy to deform and durable, but it is obvious that the processing error of the drill cannot be controlled by this preparation method
However, due to the lost wax casting method, the mold shell often has problems such as poor strength and deformation during the casting process, and it cannot be completely accurate, and further improvement is needed

Method used

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  • Dewaxing casting method for drill bit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The lost wax casting method of drill bit among the present invention, comprises the steps:

[0047] Preparation of coating: by weight, 20 parts of zircon powder, 40 parts of corundum powder, 13 parts of primary SiO 2 Sol, 25 parts of secondary SiO 2 Sol, 0.3 parts of carbon nanotubes, 1.3 parts of wetting agent, and 0.3 parts of defoamer were mixed, mechanically stirred for 11 hours while ultrasonically vibrating, and then plasma treated for 4 minutes to make a basic coating, which was diluted with water to make a viscosity of 3 cp Primary paint and secondary paint with a viscosity of 10cp;

[0048] Among them, the mesh numbers of zircon powder and corundum powder are 200-400 mesh. Primary SiO 2 The colloidal particle size of the sol is 8-12nm, and the secondary SiO 2 The colloidal particle size of the sol is 15-20nm.

[0049] Shell making: Spray the primary coating on the surface of the preformed meltable wax pattern under a vacuum of 0.05MPa for the first coating...

Embodiment 2

[0054] The lost wax casting method of drill bit among the present invention, comprises the steps:

[0055] Preparation of coating: by weight, 30 parts of zircon powder, 35 parts of mullite, 11 parts of primary SiO 2 Sol, 24 parts of secondary SiO 2 Sol, 0.4 parts of carbon nanotubes, 1.4 parts of wetting agent, and 0.4 parts of defoamer were mixed, mechanically stirred for 12 hours while ultrasonically vibrating, and then plasma treated for 4 minutes to make a basic coating, which was diluted with water to make a viscosity of 3.5cp The primary paint and the secondary paint with a viscosity of 9cp;

[0056] Among them, the mesh numbers of zircon powder and mullite are 200-300 mesh. Primary SiO 2 The colloidal particle size of the sol is 8-10nm, and the secondary SiO 2 The colloidal particle size of the sol is 15-18nm.

[0057] Shell making: Under the vacuum degree of 0.08MPa, spin-spray the primary paint on the surface of the preformed meltable wax type for the first time,...

Embodiment 3

[0062] The lost wax casting method of drill bit among the present invention, comprises the steps:

[0063] Preparation of coating: by weight, 20 parts of zircon powder, 20 parts of corundum powder, 30 parts of alumina powder, 12 parts of primary SiO 2 Sol, 20 parts of secondary SiO 2 Sol, 0.5 parts of carbon nanotubes, 1.5 parts of wetting agent, and 0.5 parts of defoamer were mixed, mechanically stirred for 14 hours while ultrasonically vibrating, and then plasma treated for 4.5 minutes to make a basic coating, which was diluted with water to make a viscosity of 4cp The primary paint and the secondary paint with a viscosity of 8.5cp;

[0064] Among them, the mesh numbers of zircon powder, corundum powder and alumina powder are 250-350 mesh. Primary SiO 2 The colloidal particle size of the sol is 10-12nm, and the secondary SiO 2 The colloidal particle size of the sol is 18-20nm.

[0065] Shell making: Spray the primary coating on the surface of the preformed meltable wax ...

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Abstract

The invention relates to a dewaxing casting method for a drill bit and belongs to the technical field of casting. The casting method includes the steps of coating preparation, shell preparation, calcinations, melting casting and post-processing. The coating preparation includes the steps that materials are mixed, ultrasonic vibration is performed while mechanical stirring is performed for 8-15 hours, then plasma processing is performed for 3-5 minutes, and a basic coating is fabricated; and water is added to the basic coating to dilute the basic coating into a first-grade coating and a second-grade coating, and the viscosity of the first-grade coating is smaller than that of the second-grade coating. The shell preparation includes the steps that the coating is smeared on the preformed fusible wax mould surface, sand blasting and drying are performed, then dewaxing is performed, and a mould shell billet is fabricated. Smearing of the coating includes the steps of primary smearing and secondary smearing, in the primary smearing process, the first-grade coating is rotatably sprayed on the fusible wax mould surface, in the secondary smearing process, the fusible wax mould coated with the first-grade coating is soaked in the secondary coating and then taken out, and the steps of coating smearing, sand spraying and drying are repeatedly performed for 2-5 times. The drill bit prepared through the method is small in error, precise in size and smooth and clean in surface.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to a lost-wax casting method for a drill bit. Background technique [0002] The drill bit is a commonly used tool for drilling. The structure of the drill bit is usually with a cutting edge at the front end and a chip removal groove on the cutter body. When in use, the cutting end mainly bears the cutting force, and the chips are discharged through the chip flute. With the development of science and technology, the workpiece has higher and higher requirements for machining accuracy, but the existing drill bit adopts the general casting method, which often has the problems of low machining accuracy and large error, and cannot accurately process the workpiece. Chinese patent application (CN103752907A) discloses a hollow drill bit and a preparation method thereof, which are prepared by machining, surfacing, quenching and tempering heat treatment, and vacuum coating antirust treatment. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22B22C3/00
CPCB22C3/00B22C9/043B22C9/22
Inventor 练炳方
Owner 宁波神钻工具有限公司
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