Screw machining process and device

A technology of processing technology and processing equipment, which is applied in the field of screw processing technology and processing equipment, can solve the problems that affect the processing accuracy and surface roughness, it is difficult to guarantee the processing quality of parts, and the screw error is large, so as to alleviate the situation of multilateral cracks and expand Effective crystallization temperature range, effect of reducing hot cracking tendency

Pending Publication Date: 2019-04-12
XIANGYANG FURUITE MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that the slender screw has poor rigidity and is easily deformed during processing, so that the error of the processed screw is large, and it is difficult to ensure the processing quality of the parts.
In addition, there is still improper clamping in turning long screw rods, which is prone to bending deformation and vibration due to cutting force and gravity, thus affecting machining accuracy and surface roughness

Method used

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  • Screw machining process and device
  • Screw machining process and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] S1: Material selection. 85Cr alloy structural steel and round bar are selected as raw materials.

[0042] S2: Forging, cutting and processing on a machine tool to obtain a round bar-shaped steel product with a length of 50 cm and a diameter of 5 cm.

[0043]S3: heat treatment. Put the workpiece into the electric furnace, heat and anneal, the annealing temperature is 680°C, keep it warm for 2h, and cool the furnace to 500°C. Then normalize and heat to 760°C, keep warm for 3h, and air-cool. For the first quenching, the temperature is 760°C, heat preservation for 1h, and the oil is cooled to 300°C. High temperature tempering, the temperature is 350 ℃, heat preservation 3h, air cooling. Carburizing, the carburizing fluid is acetone, and ammonium molybdate with a concentration of 0.5mol / L is dissolved in the acetone. The carburizing temperature is 900°C, the holding time is calculated as 0.15-0.2mm / h, the drip volume is 35-65 drops / min, and the carburizing time is 5h. ...

Embodiment 2

[0049] S1: Material selection. 85Cr alloy structural steel and round bar are selected as raw materials.

[0050] S2: Forging, cutting and processing on a machine tool to obtain a round bar-shaped steel product with a length of 50 cm and a diameter of 5 cm.

[0051] S3: heat treatment. Put the workpiece into the electric furnace, heat and anneal, the annealing temperature is 700°C, keep it warm for 2h, and cool the furnace to 510°C. Then normalize and heat to 740°C, keep warm for 3h, and air-cool. For the first quenching, the temperature is 770°C, heat preservation for 1h, and the oil is cooled to 330°C. High temperature tempering, the temperature is 360 ℃, heat preservation 3h, air cooling. Carburizing, the carburizing fluid is acetone, and ammonium molybdate with a concentration of 0.3mol / L is dissolved in the acetone. The carburizing temperature is 910°C, the holding time is 0.15-0.2mm / h, the drip volume is 35-65 drops / min, and the carburizing time is 5h. Direct second...

Embodiment 3

[0057] S1: Material selection. 85Cr alloy structural steel and round bar are selected as raw materials.

[0058] S2: Forging, cutting and processing on a machine tool to obtain a round bar-shaped steel product with a length of 50 cm and a diameter of 5 cm.

[0059] S3: heat treatment. Put the workpiece into the electric furnace, heat and anneal, the annealing temperature is 710°C, keep it warm for 2h, and cool the furnace to 510°C. Then normalize and heat to 780°C, keep warm for 3h, and air-cool. For the first quenching, the temperature is 780°C, heat preservation for 1h, and the oil is cooled to 330°C. High temperature tempering, the temperature is 360 ℃, heat preservation 3h, air cooling. Carburizing, the carburizing fluid is acetone, and ammonium molybdate with a concentration of 0.3mol / L is dissolved in the acetone. The carburizing temperature is 910°C, the holding time is 0.15-0.2mm / h, the drip volume is 35-65 drops / min, and the carburizing time is 5h. Direct second...

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Abstract

The invention relates to the technical field of screw machining, in particular to a screw machining process and device. The screw produced through the machining process has high hardness, meanwhile, the damping performance of a workpiece is improved, and thus the application range of the workpiece is expanded. The screw machining process comprises the key points that S1, material selection is conducted; S2, forging is conducted to obtain round-bar-shaped steel; S3, heat treatment is conduced, and the specific process sequentially comprises annealing, normalizing, first quenching, high-temperature tempering, carburizing, second quenching and low-temperature tempering; S4, the end face is milled; S5, a central hole is drilled; S6, a spiral groove is milled, and the steel treated through thestep S5 is placed in a thread rolling die, positioned through a positioning tool and subjected to thread rolling operation; and S7, chamfers at the ends are milled, and thus a finished product is obtained.

Description

technical field [0001] The invention belongs to the technical field of screw rod processing, and in particular relates to a screw rod processing technology and processing equipment. Background technique [0002] The screw is the main and key part of the mechanical parts. Its working environment is often rotating at high speed, high pressure and high temperature. Therefore, the screw needs to have good tensile, bending and fatigue resistance, not only high hardness but also wear resistance. Good toughness, it is widely distributed in various industries such as automobile, metallurgy, machinery, petroleum, electric power, building materials, shipbuilding, etc. Some industries also require the screw to have better damping, vibration and noise reduction functions. In the industry, the processing of long screws has always been a difficult problem in turning. The reason is that the slender screw has poor rigidity and is easily deformed during processing, so that the error of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D9/00C21D1/18C23C8/46B21H3/04
CPCC21D1/18C21D9/0075C23C8/46B21H3/04B23P15/00
Inventor 郑军刘胜全曾庆波
Owner XIANGYANG FURUITE MACHINERY MFG CO LTD
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