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Thread processing method for aluminum oxide ceramics

A technology of alumina ceramics and thread processing, which is applied in the field of alumina ceramics, can solve the problems that the controllability cannot meet the screw precision requirements, the specifications of alumina ceramic workpieces cannot be determined, and the specifications cannot be completely unified, etc., to achieve convenient application and high precision , the effect of reducing the overall mass

Active Publication Date: 2015-06-03
ZIBO BEICHEN CERAMICS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Thread processing is a processing technology required for workpieces with high precision requirements. The alumina ceramics produced by traditional processes have a firing line shrinkage of 12% to 25%, which will inevitably lead to the uncertainty of the specifications of the prepared alumina ceramic workpieces. , there is a difference in size between products that exceeds the thread accuracy requirements
Even if the alumina ceramic workpiece with thread is made, it cannot be used interchangeably
Even if some production methods can control the firing line shrinkage of alumina ceramics to 7%~8%, the degree of controllability cannot meet the precision requirements of screws, and the specifications cannot be completely unified.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare the cone section of the threaded ceramic slag remover with a diameter of 45mm;

[0026] 1. Put the alumina granulation powder with a purity of 94% into an oven for drying at 70°C for 8 hours;

[0027] 2. Seal the dried alumina granulation powder with a hard mold;

[0028] 3. Clean the foreign mold impurities;

[0029] 4. After moving into the isostatic press, close the cylinder;

[0030] 5. The isostatic press is programmed to pressurize and boost, from normal pressure to 30MPa for 3 minutes, then to 46MPa for 4 minutes, until the pressure reaches 100Mpa, and then for 7 minutes, and set the pressure release according to the geometric shape of the product Curve, it takes 25 minutes to release from high pressure to 43Mpa, and it takes 8 minutes to release to 30Mpa, and then it can quickly drop to the indoor pressure;

[0031] 6. Exit the machine to clean and remove the outer mold;

[0032] 7. Remove the mold and move it into the lathe tooling to ensure the co...

Embodiment 2

[0041] Prepare the cone section of the threaded ceramic slag remover with a diameter of 300mm;

[0042] 1. Put the alumina granulation powder with a purity of 92% into an oven for drying, and dry at 65°C for 18 hours;

[0043] 2. Seal the dried alumina granulation powder with a hard mold;

[0044] 3. Clean the foreign mold impurities;

[0045] 4. After moving into the isostatic press, close the cylinder;

[0046] 5. The isostatic press is programmed to pressurize and increase the pressure, from normal pressure to 30MPa and hold the pressure for 4 minutes, then increase to 46MPa and hold the pressure for 4 minutes, until the pressure reaches 110Mpa, and then hold the pressure for 8 minutes, and set the pressure release according to the geometric shape of the product Curve, it takes 25 minutes to release from high pressure to 46Mpa, and it takes 10 minutes to release to 30Mpa, and then it can quickly drop to the indoor pressure;

[0047] 6. Exit the machine to clean and remov...

Embodiment 3

[0057] Prepare bolts with a diameter of 16mm;

[0058] 1. Put the alumina granulation powder with a purity of 99% into an oven for drying at a temperature of 50°C for 5 hours;

[0059] 2. Seal the dried alumina granulation powder with a sealed bag;

[0060] 3. Clean the foreign mold impurities;

[0061] 4. After moving into the isostatic press, close the cylinder;

[0062] 5. The isostatic press is programmed to pressurize and increase the pressure, from normal pressure to 28MPa for 2 minutes, then to 42MPa for 3 minutes, until the pressure reaches 70Mpa, and then for 5 minutes, and set the pressure release according to the geometric shape of the product Curve, it takes 15-30 minutes to release from high pressure to 41Mpa, and 5 minutes to release to 30Mpa, and then it can quickly drop to the indoor pressure;

[0063] 6. Exit the machine to clean and remove the outer mold;

[0064] 7. Remove the mold and move it into the lathe tooling to ensure the concentricity and stabi...

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Abstract

The invention discloses a thread processing method for aluminum oxide ceramics, and belongs to the technical field of aluminum oxide ceramics. The thread processing method is characterized by comprising the following steps: performing isostatic pressure pressing on dried aluminum oxide powder, thereby obtaining an aluminum oxide blank to be processed; processing threads on a screw rod, thereby obtaining a blank with threads; continuously sintering the threaded blank for 36-58 hours from the room temperature to 1600 DEG C by using a constant gradient sectional sintering process, and cooling to be the room temperature according to a cooling curve after the sintering is completed, thereby obtaining the threads, wherein the continuous temperature rising process takes 34-52 hours in the continuous sintering process. The shrinkage rate of a sintered line can be controlled to be of a certain value according to demands, so that a threaded product of the aluminum oxide ceramic is uniform in specification and sufficient in precision after being sintered.

Description

technical field [0001] The invention discloses a thread processing method for alumina ceramics, which belongs to the technical field of alumina ceramics. Background technique [0002] Alumina ceramics is a well-known excellent armor material with high elastic modulus, wear resistance, chemical corrosion resistance and high temperature stability. However, alumina ceramics not only have high hardness and high brittleness, but also lead to poor processability and difficulty in processing; and because alumina ceramics have 12%~25% firing line shrinkage and a considerable degree of firing deformation when fired at high temperature, the initial The size and surface finish of fired ceramic products often fail to meet the corresponding precision requirements. After the alumina workpiece is fired to obtain the biscuit, it generally requires ceramic grinding to obtain ceramic parts with dimensional accuracy and surface finish that meet the standards. [0003] Thread processing is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 王世宝
Owner ZIBO BEICHEN CERAMICS EQUIP
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