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Method for improving sheet annular titanium alloy gear part machining precision

A technology for machining parts and titanium alloys, which is applied in the field of improving the machining accuracy of thin ring-shaped titanium alloy gear parts, and can solve the problems of poor cutting performance, small deformation coefficient and large back cutting force of titanium alloys.

Active Publication Date: 2015-06-10
XIAN NORTH ELECTRO OPTIC TECH DEFENSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, titanium alloy has poor cutting performance and is a typical difficult-to-cut material.
Specifically, it is manifested in low thermal conductivity, small elastic modulus, small deformation coefficient, high chemical activity, small main cutting force and large back cutting force. It is not suitable for making slender shafts and thin-walled parts. Poor, difficult to clamp, easily deformed during processing
For general parts, it is sufficient to select cutting tools with good performance, adopt general clamps, auxiliary tools, increase the aging process and other technological measures, but it is not enough to take the above measures only for thin ring titanium alloy parts

Method used

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  • Method for improving sheet annular titanium alloy gear part machining precision
  • Method for improving sheet annular titanium alloy gear part machining precision
  • Method for improving sheet annular titanium alloy gear part machining precision

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Embodiment 1

[0026] The purpose of the present invention is achieved as follows. A method for improving the machining accuracy of thin annular titanium alloy gear parts includes the following steps:

[0027] 1) For rough turning, the parts are pressed with a pressing plate along the axis direction, and the parts are roughed; radial pressing methods such as three-jaws are prohibited during the processing to prevent "three-point" deformation.

[0028] 2) Recrystallization annealing. In step 1, the parts have a large machining allowance, a large cutting stress will be generated inside, and the material structure is also in an unstable state. Therefore, recrystallization annealing is arranged in the process plan. The heating temperature is 740~760℃, and the temperature is kept warm. After 1.9~2.1h, the furnace is cooled to 150°C and then air-cooled to room temperature. This process will recrystallize the deformed grains and restore the equilibrium state. The metallographic structure and stress state...

Embodiment 2

[0041] Take the machining of 6-level precision gear parts as an example, the material is titanium alloy TC4, the modulus is M1, the number of teeth is 330, and the part structure is as follows figure 1 and figure 2 As shown, the diameter of the inner hole 1 is φ312H6mm, and the diameter of the addendum circle 2 is φ332h8mm. The coaxiality of the addendum circle 2 to the inner hole 1 is required to be φ0.014mm; the thickness of the gear is 6mm, and the two ends are perpendicular to the inner hole 1. It is 0.014mm, and 27 gear slots 3 with a radius of 3mm and a depth of 3.5mm are distributed on the circumference of φ318mm, 27 first gear holes 4 with φ3.4mm, and 6 second gear holes 5 with φ2mm. image 3 As shown, the outer ring of the gear addendum circle 2 has an annular process boss 6.

[0042] From the analysis of the part structure, the difference between the inner and outer radius of the ring of the part is only 10mm, the thickness is 6mm, and the diameter of the addendum circl...

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Abstract

The invention relates to a method for improving the sheet annular titanium alloy gear part machining precision. The method includes the following steps: (1) rough turning a blank, pressing a part through a pressing plate along the axis direction, and conducting rough machining on the part; (2) recrystallization annealing; (3) rough turning a gear bank again; (4) thermocycling; (5) semi-finish-turning the gear blank; (6) stress relief annealing; (7) conducting auxiliary procedures, and machining and finishing other structural elements of the part thoroughly; (8) conducting subzero treatment; (9) finishing machining the gear blank; and (10) manufacturing teeth and conducting thermo-cold cycling. After the teeth are manufactured, conducting twice thermo-cold cycling, conducting cold treatment at the temperature of -50- -60 DEG C, keeping the temperature for 1.3-1.7h, air cooling to the room temperature for 1.5h, heating to 80-100 DEG C in a thermostat, keeping the temperature for 2.8-3.2h, air cooling to the room temperature, and finishing finish machining. By means of the method, deformation in a machining process can be eliminated.

Description

Technical field [0001] The invention relates to the field of parts processing, in particular to a method for improving the processing accuracy of thin annular titanium alloy gear parts. Background technique [0002] Titanium alloy is an indispensable key material for high-tech products. Titanium alloy materials have good comprehensive mechanical, chemical and physical properties, light weight, and a density of about 4.54g / cm. 3 , Is about 60% of steel, but its specific strength (strength / density) is the highest alloy among modern engineering structural metal materials. After adding alloy strengthening elements to the titanium alloy material, the thermal stability is very high, and its strength is about 10 times higher than that of aluminum alloy under the conditions of 300 °C to 350 °C. Therefore, titanium alloy materials are widely used in weapons, aviation, aerospace and other fields. [0003] However, titanium alloy has poor cutting performance and is a typical difficult-to-cut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/14
Inventor 张勇杨永娟李时威陈贞奇蔡永斌
Owner XIAN NORTH ELECTRO OPTIC TECH DEFENSE
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