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Nitriding processing technology for sewing machine presser foot piece

A sewing machine presser foot and processing technology, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems that cannot meet the high-precision technical requirements, the surface hardness of the presser foot parts is low, and the hardness of the workpiece is low. , to achieve the effect of saving quenching and tempering treatment process before nitriding, reducing production cost and increasing nitrogen content

Inactive Publication Date: 2017-09-29
昆山鑫昌泰模具科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, when the gas nitriding heat treatment is performed on the surface of the sewing machine presser foot made of 56CrNiMoV7, since the workpiece is cast and formed, it has not been quenched and tempered before nitriding, and the hardness of the workpiece is low. If the conventional short-time nitriding process is used , it is easy to cause the surface hardness of the presser foot to be low, and the depth of the deep layer is shallow, which cannot meet the high-precision technical requirements

Method used

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  • Nitriding processing technology for sewing machine presser foot piece
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  • Nitriding processing technology for sewing machine presser foot piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A nitriding processing technology for a sewing machine presser foot, comprising the following processing steps:

[0025] (1) Pretreatment process; the sewing machine presser foot made of 56CrNiMoV7 is placed in an ultrasonic cleaning machine for cleaning to remove the oil stains on the surface of the sewing machine presser foot; rack, and hoisted into the well-type nitriding furnace model RN-75-6;

[0026] (2) Exhaust process; after checking that the lid of the nitriding furnace is covered correctly, the nitriding furnace is heated up, and nitrogen gas with a purity of more than 99.99% is introduced during the heating process to exhaust the air in the nitriding furnace. The nitrogen flow rate is set to 1m 3 / h, and at the same time control the furnace pressure to 0.01Pa;

[0027] (3) Pre-oxidation process; when the furnace temperature in the nitriding furnace rises to 300°C, keep it warm for 1 hour to ensure that the temperature of the sewing machine presser foot also...

Embodiment 2

[0032] A nitriding processing technology for a sewing machine presser foot, comprising the following processing steps:

[0033] (1) Pretreatment process; the sewing machine presser foot made of 56CrNiMoV7 is placed in an ultrasonic cleaning machine for cleaning to remove the oil stains on the surface of the sewing machine presser foot; rack, and hoisted into the well-type nitriding furnace model RN-75-6;

[0034] (2) Exhaust process; after checking that the lid of the nitriding furnace is covered correctly, the nitriding furnace is heated up, and nitrogen gas with a purity of more than 99.99% is introduced during the heating process to exhaust the air in the nitriding furnace. The nitrogen flow rate is set to 1m 3 / h, and at the same time control the furnace pressure to 0.02Pa;

[0035] (3) Pre-oxidation process; when the furnace temperature in the nitriding furnace rises to 300°C, keep it warm for 1 hour to ensure that the temperature of the sewing machine presser foot also...

Embodiment 3

[0040] A nitriding processing technology for a sewing machine presser foot, comprising the following processing steps:

[0041](1) Pretreatment process; the sewing machine presser foot made of 56CrNiMoV7 is placed in an ultrasonic cleaning machine for cleaning to remove the oil stains on the surface of the sewing machine presser foot; rack, and hoisted into the well-type nitriding furnace model RN-75-6;

[0042] (2) Exhaust process; after checking that the lid of the nitriding furnace is covered correctly, the nitriding furnace is heated up, and nitrogen gas with a purity of more than 99.99% is introduced during the heating process to exhaust the air in the nitriding furnace. The nitrogen flow rate is set to 1m 3 / h, and at the same time control the furnace pressure to 0.01Pa;

[0043] (3) Pre-oxidation process; when the furnace temperature in the nitriding furnace rises to 280°C, keep it warm for 1 hour to ensure that the temperature of the sewing machine presser foot also ...

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Abstract

The invention discloses a nitriding processing technology for a sewing machine presser foot piece. The technology comprises the pretreatment procedure, the exhaust procedure, the pre-oxidization procedure, the nitriding procedure and the cooling procedure. Particularly, the pre-oxidization procedure is conducted before the nitriding procedure of the processing technology, the temperature and time of the oxidization process are reasonably controlled, accordingly, a layer of oxidization film is generated on the surface of a workpiece and has high adsorption performance for nitride, the nitrogen content of the surface of the workpiece is obviously improved, the nitrogen concentration gradient of the surface of the workpiece is increased, accordingly, the speed of diffusion of nitrogen atoms to a sewing machine presser foot piece base body is increased, the fatigue resisting strength, the abrasion resistance and other properties of the surface of the presser foot piece are improved, and the service life of the presser foot piece is prolonged. In addition, at the pre-treatment procedure stage, an ultrasonic cleaning machine is adopted for cleaning the sewing machine presser foot piece, oil dirt on the surface of the sewing machine presser foot piece is removed, and activated nitrogen atoms can be more easily adsorbed to the surface of the sewing machine presser foot piece during nitriding treatment.

Description

technical field [0001] The invention relates to the technical field of metal surface heat treatment, and specifically provides a nitriding process for a sewing machine presser foot. Background technique [0002] Nitriding is the process of infiltrating the surface layer of steel with nitrogen atoms. Its purpose is to improve the hardness and wear resistance of the surface layer, as well as improve fatigue strength and corrosion resistance. [0003] At present, when the gas nitriding heat treatment is performed on the surface of the sewing machine presser foot made of 56CrNiMoV7, since the workpiece is cast and formed, it has not been quenched and tempered before nitriding, and the hardness of the workpiece is low. If the conventional short-time nitriding process is used , It is easy to cause the surface hardness of the presser foot to be low, and the depth of the deep layer is shallow, which cannot meet the high-precision technical requirements. [0004] In view of this, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/02C23C8/14C23C8/38
CPCC23C8/02C23C8/14C23C8/38
Inventor 沈君朱金凯郑飞飞
Owner 昆山鑫昌泰模具科技有限公司
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