Method for manufacturing pneumatic or electric tool taping block

A technology of electric tools and manufacturing methods, which is applied in the field of manufacturing pneumatic tool impact blocks, can solve the problems of high production cost of high-performance and high-precision forgings, easy cracking and failure of molds, etc., and achieve good surface smoothness and reduce Production cost, effect of eliminating cracks

Inactive Publication Date: 2010-12-29
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the forging process is carried out at high temperature, the mold is prone to cracks and is prone to failure
Therefore, th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, the manufacturing method of the pneumatic or electric tool impact block of this embodiment includes the following steps in sequence:

[0019] ① Prepare the raw material, that is, the mixed powder of iron and carbon. The formula is: 99.8% iron: 0.1% carbon, and then add wax with a content of 0.1%;

[0020] ② Press the above mixed powder on a press with a pressure greater than 600MPa to make the density greater than 7.3g / cm 3 Block parts; pressing can be formed by warm pressing and mold heating.

[0021] ③Sintering, the block parts are sintered at a temperature of 1100°C, the sintering time is more than 10 minutes, and the sintering is carried out in a vacuum sintering furnace or in a sintering furnace based on nitrogen and the proportion of hydrogen is 10vol%;

[0022] ④Heat treatment: Determine the heat treatment process according to the chemical composition requirements of the sintered parts. The heat treatment quenching temperature is 800°C, hold for 30...

Embodiment 2

[0023] Embodiment 2, the manufacturing method of the pneumatic or electric tool impact block of this embodiment includes the following steps in sequence:

[0024] ① Prepare the raw materials, that is, the mixed powder of iron, chromium, carbon and copper. The formula is: iron: 99.1%, carbon: 0.2%, chromium: 0.2%, and then add wax with a content of 0.5%;

[0025] ② Press the above mixed powder on a press with a pressure greater than 600MPa to make the density greater than 7.3g / cm 3 Block parts; pressing can be formed by warm pressing and mold heating.

[0026] ③Sintering, the block parts are sintered at a temperature of 1350°C, the sintering time is more than 12 minutes, and the sintering is carried out in a vacuum sintering furnace or in a sintering furnace based on nitrogen and the proportion of hydrogen is 10vol%;

[0027] ④Heat treatment: Determine the heat treatment process according to the chemical composition requirements of the sintered parts. The heat treatment quench...

Embodiment 3

[0029] Embodiment 3, the manufacturing method of the pneumatic or electric tool impact block of this embodiment includes the following steps in sequence:

[0030] ① Prepare the raw materials, that is, the mixed powder of iron, chromium, molybdenum, nickel, carbon and copper. The formula is: 84.5% iron: 1.0% carbon, 5.0% chromium, 1.5% molybdenum, and 4% nickel , the copper content is 3%, wherein, chromium, molybdenum, copper, nickel are added in the form of iron alloy or master alloy, and then wax with a content of 1% is added;

[0031] ② Press the above mixed powder on a press with a pressure greater than 600MPa to make the density greater than 7.3g / cm 3 Block parts; pressing can be formed by warm pressing and mold heating.

[0032] ③Sintering, the block parts are sintered at a temperature of 1350°C, the sintering time is more than 30 minutes, and the sintering is carried out in a vacuum sintering furnace or in a sintering furnace based on nitrogen and the proportion of hydr...

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Abstract

The invention discloses a method for manufacturing a pneumatic or electric tool taping block, which sequentially comprises the following steps of: (1) preparing raw materials, namely mixed powder of iron, chromium, molybdenum, nickel, carbon and copper, and adding a lubricant with required content; (2) pressing the mixed powder on a press under the pressure of more than 600 MPa into bulk parts with the density of more than 7.3 g/cm<3>; (3) sintering, namely sintering the bulk parts in a vacuum sintering furnace at the temperature of between 1,100 and 1,350 DEG C for more than 10-30 minutes; and (4) performing heat treatment, namely determining a heat treatment process according to the chemical composition requirement of the sintered parts, keeping the quenching temperature of the heat treatment between 800 and 1,000 DEG C, keeping the temperature for 30 to 45 minutes, keeping the tempering temperature between 150 and 400 DEG C, and keeping the temperature for 110 to 130 minutes. Compared with the prior art, the method has the advantages of simple manufacturing process, high precision, good surface smoothness, effective elimination cracks of the mold easily generated in the forging process at high temperature, reduction of production cost and improvement of production efficiency, so the method is a manufacturing method worthy of popularization.

Description

technical field [0001] The invention relates to a manufacturing method of a pneumatic tool hammer (HAMMER). Background technique [0002] Generally, the unified blow blocks of pneumatic or electric tools use powder forging process or ordinary die forging process. For the powder forging process, compared with ordinary die forging, it has the following advantages: (1) High formability: due to the fine powder particles, when poured into the mold cavity, it fills the cavity like a fluid, and the formability is extremely high. Therefore, forgings with various complex shapes can be formed smoothly. (2) High mechanical properties: the fatigue strength of forging increases from 290MPa for ordinary die forgings to 340MPa for powder forgings. (3) High precision of forgings: Since the heating temperature of forging is low, and it is carried out in an anti-oxidation protective atmosphere without scale, it is possible to obtain forgings with high dimensional accuracy and low surface ro...

Claims

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Application Information

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IPC IPC(8): B22F3/16B22F3/24
Inventor 包崇玺曹红斌张静锋郑财明
Owner NBTM NEW MATERIALS GRP
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