Vacuum oil quenching heat treatment technology for alloy tool steel bearing steel wire taper die
A technology of alloy tool steel and vacuum oil, applied in heat treatment furnaces, heat treatment equipment, quenching agents, etc., can solve problems such as surface oxidation, cracking and quenching, product surface decarburization, etc., to avoid product deformation and cracking, and heating speed slow, tissue-dense effect
Inactive Publication Date: 2018-02-09
HANGZHOU HANGREN TOOLS
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Problems solved by technology
[0004] However, there are some defects in salt bath quenching: 1. During the heating process and surface cleaning treatment, waste gas and boiling water will be generated to pollute the environment; 2. During the heating and heat preservation process of medium temperature salt bath heat treatment, the temperature rise rate is relatively fast, and it is easy to generate quenching stress inside the workpiece , resulting in product deformation, cracking and quenching brittleness; 3. The surface of the product is easily oxidized during the heating process, resulting in decarburization of the product surface, causing fatal damage to the tap and die; Surface pickling and treatment, complex process
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Embodiment
[0019] Embodiment: A vacuum oil quenching heat treatment process for alloy tool steel bearing steel tap and die, including vacuum oil quenching process and vacuum tempering process, wherein:
[0020] Vacuum oil quenching process includes: 1. Quenching and heating 1: Put the workpiece into the vacuum furnace, and the heat adopts radiation linear heating, and the workpiece is heated from normal temperature to 700°C, and the heating time is 100min;
[0021] 2. Vacuumizing 7. After heating to 700°C, adopt a stepped vacuuming method to vacuumize the vacuum furnace from normal pressure to 0.02 bar. The vacuuming is divided into three steps. The first step is from normal pressure to 0.6 bar. bar, then pressurized to 0.7bar, the second step is vacuumed from 0.7bar to 0.3bar, then boosted to 0.4bar, the third step is vacuumed from 0.4bar to 0.02bar, and the vacuuming is completed within 140-150min;
[0022] 3. Vacuum heating 2: After vacuuming, heat through thermal radiation, from 700°...
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The invention relates to a vacuum oil quenching heat treatment technology for an alloy tool steel bearing steel wire taper die. The vacuum oil quenching heat treatment technology includes a vacuum oilquenching technology and a vacuum tempering technology, wherein the vacuum oil quenching technology includes the steps of heat radiation heating, step-type vacuumizing, vacuum heat insulation, vacuumquenching oil cooling and air cooling. The vacuum tempering technology includes the steps of heating to the tempering temperature, vacuumizing and heat insulation and air cooling. Through vacuum oilquenching and vacuum tempering, the optimum performance of the alloy steel bearing steel wire taper die is obtained, cutting thread internal texture of the die is dense, good toughness under high hardness is achieved, vacuum oil quenching has no pollution to the environment, the heating speed is slow, product deformation and cracking are avoided, the whole process is implemented under vacuum, andproduct surface decarburization cannot be caused.
Description
technical field [0001] The invention relates to a heat treatment process, in particular to an alloy tool steel bearing steel tap die vacuum oil quenching heat treatment process. Background technique [0002] Heat treatment refers to a metal thermal processing process in which materials are heated, kept warm and cooled in a solid state to obtain the desired structure and properties. [0003] Due to the particularity of alloy tool steel and bearing steel materials, the existing alloy tool steel bearing steel taps and dies are mostly quenched in a medium-temperature salt bath. The salt bath is to melt industrial salt into a liquid state as a heating medium, and then put the workpiece to be heat-treated Heating in liquid salt and finally heat treatment. [0004] However, there are some defects in salt bath quenching: 1. During the heating process and surface cleaning treatment, exhaust gas and boiling water will be generated to pollute the environment; 2. During the heating and...
Claims
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IPC IPC(8): C21D1/18C21D1/773C21D9/22C21D1/58
CPCC21D1/18C21D1/58C21D1/773C21D9/22
Inventor 徐水木
Owner HANGZHOU HANGREN TOOLS