A method for machining an internal gear ring used in an internal gear pump

An internal gear pump and processing method technology, applied in the field of mechanical processing, can solve the problems that the depth of the nitrided layer cannot meet the use requirements, the surface roughness of the inner gear ring cannot be guaranteed, the material consumption and product energy consumption are large, etc. The structure of the nitrided layer is easy to control, the processing procedure is simple, and the effect of improving the precision

Active Publication Date: 2016-04-27
NINGBO HOYEA MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the internal ring gear in the prior art generally adopts secondary carbonitriding, and is formed by shaping, pushing, and pulling teeth. However, the secondary carbonitriding treatment method ensures that the thermal deformation of the internal The depth of the nitrided layer cannot meet the requirements of use, the depth of the nitrogen layer is only 0.4-0.5mm, and the HV is less than 850, so it is easy to cause the hardened layer to fail due to wear, and the thermal deformation of the inner ring gear caused by repeated carbonitriding treatment is relatively large. Large, which is not conducive to the normal use of the inner ring gear. In addition, the final heat treatment cannot guarantee the roughness of the inner ring gear surface
In addition, the processing of shaping, pushing and pulling teeth is difficult, the production process is long, the material utilization rate is low, the hardness of the inner ring gear is low, and the material consumption and product energy consumption are relatively large, resulting in high cost

Method used

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  • A method for machining an internal gear ring used in an internal gear pump
  • A method for machining an internal gear ring used in an internal gear pump
  • A method for machining an internal gear ring used in an internal gear pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The following nitrided steel materials are selected as raw materials, sawed according to the shape and specification of the ring gear used in the internal gear pump, and then forged to form a rough ring ring. The nitrided steel material is composed of the following mass percentages: C: 0.38%, Si: 0.30%, Mn: 0.50%, Cr: 1.50%, Al: 0.90%, Mo: 0.22%, Ni: 0.20%, Cu: 0.:25%, S: 0.03:0%, P: 0.035%, and the balance is Fe.

[0025] The inner ring gear blank produced above was subjected to normalizing treatment, the temperature of the normalizing treatment was 940° C., the holding time was 3 hours, and air cooling was performed after the normalizing treatment.

[0026] The above-mentioned air-cooled ring gear blank is subjected to rough turning, quenching and tempering treatment, and then finishing turning, drilling, deburring and annealing treatment. The specific process of the quenching and tempering treatment is to preheat the rough-turned inner ring gear blank first, the pre...

Embodiment 2

[0029]The following nitrided steel materials are selected as raw materials, sawed according to the shape and specification of the ring gear used in the internal gear pump, and then forged to form a rough ring ring. The nitrided steel material is composed of the following mass percentages: C: 0.36%, Si: 0.40%, Mn: 0.4%, Cr: 1.6%, Al: 0.7%, Mo: 0.23%, Ni: 0.25%, Cu: 0.25%, S: 0.030%, P: 0.025%, and the balance is Fe.

[0030] The inner ring gear blank produced above was subjected to normalizing treatment, the temperature of the normalizing treatment was 930° C., the holding time was 3 hours, and air cooling was performed after the normalizing treatment.

[0031] The above-mentioned air-cooled ring gear blank is subjected to rough turning, quenching and tempering treatment, and then finishing turning, drilling, deburring and annealing treatment. The specific process of the quenching and tempering treatment is to preheat the rough-turned inner ring gear blank first, the preheatin...

Embodiment 3

[0034] The following nitrided steel materials are selected as raw materials, sawed according to the shape and specification of the ring gear used in the internal gear pump, and then forged to form a rough ring ring. The nitrided steel material is composed of the following components by mass percentage: C: 0.40%, Si: 0.20%, Mn: 0.60%, Cr: 1.40%, Al: 1.10%, Mo: 0.20%, Ni: 0.30%, Cu: 0.30%, S: 0.025%, P: 0.020%, and the balance is Fe.

[0035] The inner ring gear blank produced above was subjected to normalizing treatment, the temperature of the normalizing treatment was 950° C., the holding time was 4 hours, and air cooling was performed after the normalizing treatment.

[0036] The above-mentioned air-cooled ring gear blank is subjected to rough turning, quenching and tempering treatment, and then finishing turning, drilling, deburring and annealing treatment. The specific process of the quenching and tempering treatment is to preheat the rough-turned inner ring gear blank fir...

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Abstract

The invention relates to a machining method for an annular gear in an internal gear pump and belongs to the technical field of mechanical machining. The machining method includes the following steps that a nitriding steel material is used as a raw material and is sawed and forged to form an internal gear blank; the internal gear blank is subjected to normalizing processing, the normalizing processing temperature is 930-950 DEG C, the heat is preserved for 3-4 hours, and air cooling is conducted after the normalizing processing; the air cooled internal gear blank is subjected to rough turning, thermal refining and finish turning, drilling, deburring and annealing treatment; the internal gear blank subjected to the annealing treatment is subjected to processing of polishing, rough cutting, semi-refined cutting, refined cutting and heat preservation, then is subjected to ionic nitriding treatment and finally is ground and formed to obtain the internal gear product. By means of the method, machining procedures are simple, the hardness of the internal gear is high and can be more than 1000HV, the effective hardness layer is deep and can be 0.3-0.5mm, the precision is high, deformation is small, and abrasion resistance is good.

Description

technical field [0001] The invention relates to a method for processing an inner ring gear used in an internal meshing gear pump, and belongs to the technical field of mechanical processing. Background technique [0002] Gear pumps are widely used in hydraulic systems and can be divided into external gear pumps and internal gear pumps. Internal gear pumps are often used to transport Newtonian or non-Newtonian liquids in petroleum, chemical, paint, dye, food, oil, pharmaceutical and other industries. The types of liquids to be transported can range from light and volatile liquids to heavy and viscous , even semi-solid liquids. The internal meshing gear pump adopts the principle of internal meshing of gears, the pitch circle of the inner and outer gears is close to one side, and the crescent block is separated on the other side. The driving gear on the inner gear shaft drives the inner gear to rotate in the same direction. At the inlet, the gears are separated from each othe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/14
CPCB23P15/14C22C38/002C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/42C22C38/44C23F17/00
Inventor 张策虞拯陈飞飞翁之旦
Owner NINGBO HOYEA MACHINERY MFG
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