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Method for casting high-precision drill

A high-precision, drill-bit technology, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., can solve the problems of uncontrollable drill bit processing errors, inability to accurately process workpieces, and poor shell strength, etc., to improve coating quality , Eliminate air bubbles, reduce the effect of the process

Active Publication Date: 2017-07-28
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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  • Method for casting high-precision drill

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The casting method of high precision drill bit among the present invention, comprises the steps:

[0048] 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, 0.8 parts of mesoporous calcium carbonate, 1.3 parts of wetting agent, 0.3 parts of defoamer are mixed evenly to make a basic coating, and the basic coating is diluted with water to make a first-grade coating with a viscosity of 3 cp and a viscosity of 10cp of secondary paint;

[0049] 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.

[0050] 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 and hanging, the rotation s...

Embodiment 2

[0055] The casting method of high precision drill bit among the present invention, comprises the steps:

[0056] 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, 1.0 parts of mesoporous calcium carbonate, 1.4 parts of wetting agent, and 0.4 parts of defoamer are mixed evenly to make a base paint, and the base paint is diluted with water to make a first-grade paint with a viscosity of 3.5 cp and a viscosity of 3.5 cp. A secondary paint of 9cp;

[0057] 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.

[0058] 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, the rotation speed is 60r / mi...

Embodiment 3

[0063] The casting method of high precision drill bit among the present invention, comprises the steps:

[0064] 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, 1.2 parts of mesoporous calcium carbonate, 1.5 parts of wetting agent, and 0.5 parts of defoamer are mixed evenly to make a basic coating, and the basic coating is diluted with water to make a primary coating with a viscosity of 4 cp and a viscosity of 8.5cp of secondary paint;

[0065] 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.

[0066] Shell making: Spray the primary coating on the surface of the preformed meltable wax pattern under a vacuum of 0.10MPa for...

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Abstract

The invention relates to a method for casting a high-precision drill and belongs to the technical field of casting. The method comprises the steps of shell making, roasting, melting casting and after-treatment, wherein the shell making step comprises the following sub-steps: coating the surface of a preformed fusible wax pattern with a coating, performing sand blasting and drying, and after that, performing dewaxing to manufacture a shell blank; the coating sub-step comprises first-time coating and second-time coating; during the first-time coating, a primary coating is rotationally sprayed onto the surface of the fusible wax pattern; during the second-time coating, the fusible wax pattern coated with the primary coating is immersed into a secondary coating and then taken out; the viscosity of the primary coating is smaller than that of the secondary coating; and the coating, sand blasting and drying substeps are repeated for 2-5 times. The manufactured drill is small in error, precise in dimension and smooth in surface.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to a casting method of a high-precision 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 treatme...

Claims

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Application Information

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