CN109128189B - Manufacturing method of speed-regulating three-jaw inner gear ring - Google Patents
Manufacturing method of speed-regulating three-jaw inner gear ring Download PDFInfo
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- CN109128189B CN109128189B CN201810775126.4A CN201810775126A CN109128189B CN 109128189 B CN109128189 B CN 109128189B CN 201810775126 A CN201810775126 A CN 201810775126A CN 109128189 B CN109128189 B CN 109128189B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/105—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing inorganic lubricating or binding agents, e.g. metal salts
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Abstract
The invention relates to a method for manufacturing a speed-regulating three-jaw annular gear. The method comprises the following steps: the method comprises the following steps: proportioning metal powder, and step two: pressing and forming, step three: sintering the three-jaw annular gear, and step four: carburizing the three-jaw annular gear, and including the following steps: tempering the three-jaw annular gear, and the sixth step: and (7) polishing and packaging. The method is scientific and precise, improves the tooth strength and the comprehensive mechanical property of the three-jaw internal gear ring, increases the torque transmission capacity, improves the bearing capacity of the convex jaw, and prolongs the service life of the three-jaw internal gear ring.
Description
Technical Field
The invention relates to the technical field of manufacturing of inner gear rings, in particular to a method for manufacturing a speed-regulating three-jaw inner gear ring.
Background
In the current industrial production and daily life, the electric hand drill is visible everywhere, but the speed-regulating three-jaw inner gear ring used on the electric hand drill is difficult to contact, and the common speed-regulating gear ring is a metal casting or a plastic casting or adopts the traditional cutting process. The disadvantages are that: the mechanical properties of a casting part and a traditional cutting machined part are poor, the internal structure of the material is loose, the mechanical strength of the product is poor, the tooth loss phenomenon is easy to occur, the utilization rate of the metal material in the traditional cutting machining is low, and the production efficiency is low.
Disclosure of Invention
The invention aims to provide a method for manufacturing a speed-regulating three-jaw annular gear, aiming at the defects of the prior art, namely poor performance of a casting part and a cutting machining part and low production efficiency.
In order to realize the purpose, the invention also provides a manufacturing method of the speed-regulating three-jaw annular gear, which adopts the technical scheme that:
a manufacturing method of a speed-regulating three-jaw annular gear comprises the following steps:
the method comprises the following steps: proportioning metal powder, weighing 90 parts by weight of iron powder, 2 parts by weight of nickel powder, 1.5 parts by weight of copper powder, 0.5 part by weight of molybdenum powder and 0.6 part by weight of sintering aid, wherein the sintering aid comprises 0.3 part by weight of cuprous phosphide powder and 0.3 part by weight of ferric oxide powder, and uniformly mixing the weighed powder to form powder metallurgy powder for later use;
step two: pressing and forming, namely filling the powder metallurgy powder in the first step into a die set, wherein the die set comprises a middle die fixed on a workbench, a lower die attached to the lower bottom surface of the middle die and an upper die pressing the powder metallurgy powder in a space formed by the middle die and the lower die, the middle die comprises a horizontally arranged base body, a vertical through hole is formed in the base body, the inner diameter of the through hole is 45.6mm, the depth of the through hole is 14.55 +/-0.1 mm, an annular groove is formed in the lower edge of the inner wall of the through hole, the inner diameter of the annular groove is 48mm, the groove width of the annular groove is 1.5mm, the lower die is plate-shaped, the upper surface of the lower die is abutted against the lower surface of the middle die to seal the bottom of the through hole, the upper die comprises a vertically arranged bar, the bar comprises a punch section at a free end, a middle transition section and a connecting section at the root, the diameter of the connecting section is 46mm, the diameter of the transition section is 45.6mm, and the length of the transition section is 6.9 +/-0.1 mm, the three grooves along the axial direction of the bar stock are arranged on the outer wall of the transition section at intervals, each groove comprises a pair of centrosymmetric first grooves and a second groove positioned on the transition section between the two first grooves, the width of each first groove is 7.92 +/-0.1 mm, the length of each first groove is 6.9 +/-0.1 mm, the width of each second groove is 10.65 +/-0.1 mm, the length of each second groove is 2.9 +/-0.1 mm, each second groove extends from the free end of the transition section to the corresponding connecting section, the diameter of each punch section is 38.6mm, the length of each punch section is 7.55mm, the bottom surfaces of the first grooves and the bottom surfaces of the second grooves are coplanar with the outer wall of each punch section, straight teeth along the length direction of the punch sections are arranged on the outer wall of the punch sections in the circumferential direction, the straight teeth corresponding to the grooves extend into the grooves, the length of the straight teeth positioned in the grooves is the same as the length of the corresponding grooves, and powder metallurgy powder is filled into a space formed by the lower, then, an oil press is used for pressing the upper die into the middle die, and the pressure of the oil press is 50 MPa, so that the required three-jaw inner gear ring is formed;
step three: sintering the three-jaw annular gear, and sintering the three-jaw annular gear in a sintering furnace in a protective atmosphere; the sintering furnace is vacuumized in the atmosphere of nitrogen, the vacuum degree is 0.06-0.07Mpa, the heating temperature of the sintering furnace is 880 +/-20 ℃, the temperature is kept for 3 hours, cuprous phosphide powder reacts with copper powder, nickel powder and iron powder respectively in the sintering process to generate three eutectic liquid phases of Cu-P, Ni-P and Fe-P, the material migration of alloy elements and the progress of the sintering diffusion process are promoted, the cuprous phosphide powder changes the tissue structure of a sintered body, the formation of massive ferrite in the tissue is reduced, the spacing between pearlite sheets is homogenized, ferric oxide powder is uniformly distributed among powder particles of the sintered body in the sintering process, the cohesive force among the powder is improved, the sintering speed is accelerated, the sintering temperature is reduced, and the sintered body is naturally cooled to below 50 ℃ and then taken out of the sintering furnace;
step four: carburizing the three-jaw ring gear, namely placing the three-jaw ring gear in the third step in a quenching furnace for carbonitriding for 180-240 minutes, wherein the carburizing temperature is 800 +/-20 ℃;
step five: tempering the three-jaw annular gear, starting a pit furnace by an operator, vacuumizing the pit furnace, filling nitrogen into the pit furnace for protection, keeping the temperature of the heating temperature in the pit furnace at 150 +/-20 ℃ for 3 hours, and naturally cooling the pit furnace to below 50 ℃ to be discharged out of the pit furnace;
step six: and (3) polishing and packaging, and self-checking the three-jaw inner gear ring by an operator to ensure that the three-jaw inner gear ring has no crack, no material shortage, no residual meat and no burr, if the three-jaw inner gear ring is qualified, packaging, sealing, drying and storing, otherwise, the three-jaw inner gear ring is a waste product.
Compared with the prior art, the invention has the beneficial effects that: the method is scientific and precise, improves the tooth strength and the comprehensive mechanical property of the three-jaw internal gear ring, increases the torque transmission capacity, improves the bearing capacity of the convex jaw, and prolongs the service life of the three-jaw internal gear ring.
Drawings
Fig. 1 is a schematic structural view of the three-jaw annular gear in the invention.
Fig. 2 is a sectional view taken along a-a in fig. 1.
Detailed Description
The manufacturing method of the speed-regulating three-jaw annular gear comprises the following steps:
the method comprises the following steps: proportioning metal powder, weighing 90 parts by weight of iron powder, 2 parts by weight of nickel powder, 1.5 parts by weight of copper powder, 0.5 part by weight of molybdenum powder and 0.6 part by weight of sintering aid, wherein the sintering aid comprises 0.3 part by weight of cuprous phosphide powder and 0.3 part by weight of ferric oxide powder, and uniformly mixing the weighed powder to form powder metallurgy powder for later use;
step two: pressing and forming, namely filling the powder metallurgy powder in the first step into a die set, wherein the die set comprises a middle die fixed on a workbench, a lower die attached to the lower bottom surface of the middle die and an upper die pressing the powder metallurgy powder in a space formed by the middle die and the lower die, the middle die comprises a horizontally arranged base body, a vertical through hole is formed in the base body, the inner diameter of the through hole is 45.6mm, the depth of the through hole is 14.55 +/-0.1 mm, an annular groove is formed in the lower edge of the inner wall of the through hole, the inner diameter of the annular groove is 48mm, the groove width of the annular groove is 1.5mm, the lower die is plate-shaped, the upper surface of the lower die is abutted against the lower surface of the middle die to seal the bottom of the through hole, the upper die comprises a vertically arranged bar, the bar comprises a punch section at a free end, a middle transition section and a connecting section at the root, the diameter of the connecting section is 46mm, the diameter of the transition section is 45.6mm, and the length of the transition section is 6.9 +/-0.1 mm, the three grooves along the axial direction of the bar stock are arranged on the outer wall of the transition section at intervals, each groove comprises a pair of centrosymmetric first grooves and a second groove positioned on the transition section between the two first grooves, the width of each first groove is 7.92 +/-0.1 mm, the length of each first groove is 6.9 +/-0.1 mm, the width of each second groove is 10.65 +/-0.1 mm, the length of each second groove is 2.9 +/-0.1 mm, each second groove extends from the free end of the transition section to the corresponding connecting section, the diameter of each punch section is 38.6mm, the length of each punch section is 7.55mm, the bottom surfaces of the first grooves and the bottom surfaces of the second grooves are coplanar with the outer wall of each punch section, straight teeth along the length direction of the punch sections are arranged on the outer wall of the punch sections in the circumferential direction, the straight teeth corresponding to the grooves extend into the grooves, the length of the straight teeth positioned in the grooves is the same as the length of the corresponding grooves, and powder metallurgy powder is filled into a space formed by the lower die and the middle die, then, an oil press is used for pressing the upper die into the middle die, and the pressure of the oil press is 50 MPa, so that the required three-jaw inner gear ring is formed;
step three: sintering the three-jaw annular gear, and sintering the three-jaw annular gear in a sintering furnace in a protective atmosphere; the sintering furnace is vacuumized in the atmosphere of nitrogen, the vacuum degree is 0.06-0.07Mpa, the heating temperature of the sintering furnace is 880 +/-20 ℃, the temperature is kept for 3 hours, cuprous phosphide powder reacts with copper powder, nickel powder and iron powder respectively in the sintering process to generate three eutectic liquid phases of Cu-P, Ni-P and Fe-P, the material migration of alloy elements and the progress of the sintering diffusion process are promoted, the cuprous phosphide powder changes the tissue structure of a sintered body, the formation of massive ferrite in the tissue is reduced, the spacing between pearlite sheets is homogenized, ferric oxide powder is uniformly distributed among powder particles of the sintered body in the sintering process, the cohesive force among the powder is improved, the sintering speed is accelerated, the sintering temperature is reduced, and the sintered body is naturally cooled to below 50 ℃ and then taken out of the sintering furnace;
step four: carburizing the three-jaw ring gear, namely placing the three-jaw ring gear in the third step in a quenching furnace for carbonitriding for 180-240 minutes, wherein the carburizing temperature is 800 +/-20 ℃;
step five: tempering the three-jaw annular gear, starting a pit furnace by an operator, vacuumizing the pit furnace, filling nitrogen into the pit furnace for protection, keeping the temperature of the heating temperature in the pit furnace at 150 +/-20 ℃ for 3 hours, and naturally cooling the pit furnace to below 50 ℃ to be discharged out of the pit furnace;
step six: and (3) polishing and packaging, and self-checking the three-jaw inner gear ring by an operator to ensure that the three-jaw inner gear ring has no crack, no material shortage, no residual meat and no burr, if the three-jaw inner gear ring is qualified, packaging, sealing, drying and storing, otherwise, the three-jaw inner gear ring is a waste product.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (1)
1. A manufacturing method of a speed-regulating three-jaw annular gear is characterized by comprising the following steps:
the method comprises the following steps: proportioning metal powder, weighing 90 parts by weight of iron powder, 2 parts by weight of nickel powder, 1.5 parts by weight of copper powder, 0.5 part by weight of molybdenum powder and 0.6 part by weight of sintering aid, wherein the sintering aid comprises 0.3 part by weight of cuprous phosphide powder and 0.3 part by weight of ferric oxide powder, and uniformly mixing the weighed powder to form powder metallurgy powder for later use;
step two: pressing and forming, namely filling the powder metallurgy powder in the first step into a die set, wherein the die set comprises a middle die fixed on a workbench, a lower die attached to the lower bottom surface of the middle die and an upper die pressing the powder metallurgy powder in a space formed by the middle die and the lower die, the middle die comprises a horizontally arranged base body, a vertical through hole is formed in the base body, the inner diameter of the through hole is 45.6mm, the depth of the through hole is 14.55 +/-0.1 mm, an annular groove is formed in the lower edge of the inner wall of the through hole, the inner diameter of the annular groove is 48mm, the groove width of the annular groove is 1.5mm, the lower die is plate-shaped, the upper surface of the lower die is abutted against the lower surface of the middle die to seal the bottom of the through hole, the upper die comprises a vertically arranged bar, the bar comprises a punch section at a free end, a middle transition section and a connecting section at the root, the diameter of the connecting section is 46mm, the diameter of the transition section is 45.6mm, and the length of the transition section is 6.9 +/-0.1 mm, the three grooves along the axial direction of the bar stock are arranged on the outer wall of the transition section at intervals, each groove comprises a pair of centrosymmetric first grooves and a second groove positioned on the transition section between the two first grooves, the width of each first groove is 7.92 +/-0.1 mm, the length of each first groove is 6.9 +/-0.1 mm, the width of each second groove is 10.65 +/-0.1 mm, the length of each second groove is 2.9 +/-0.1 mm, each second groove extends from the free end of the transition section to the corresponding connecting section, the diameter of each punch section is 38.6mm, the length of each punch section is 7.55mm, the bottom surfaces of the first grooves and the bottom surfaces of the second grooves are coplanar with the outer wall of each punch section, straight teeth along the length direction of the punch sections are arranged on the outer wall of the punch sections in the circumferential direction, the straight teeth corresponding to the grooves extend into the grooves, the length of the straight teeth positioned in the grooves is the same as the length of the corresponding grooves, and powder metallurgy powder is filled into a space formed by the lower die and the middle die, then, an oil press is used for pressing the upper die into the middle die, and the pressure of the oil press is 50 MPa, so that the required three-jaw inner gear ring is formed;
step three: sintering the three-jaw annular gear, and sintering the three-jaw annular gear in a sintering furnace in a protective atmosphere; vacuumizing the sintering furnace in the atmosphere of nitrogen, keeping the vacuum degree of 0.06-0.07Mpa and the heating temperature of the sintering furnace at 880 +/-20 ℃ for 3 hours, naturally cooling the sintering furnace to below 50 ℃ and taking the sintering furnace out;
step four: carbonitriding the three-jaw annular gear, namely putting the three-jaw annular gear in the third step into a quenching furnace for carbonitriding for 180-240 minutes at the temperature of 800 +/-20 ℃;
step five: tempering the three-jaw annular gear, starting a pit furnace by an operator, vacuumizing the pit furnace, filling nitrogen into the pit furnace for protection, keeping the temperature of the heating temperature in the pit furnace at 150 +/-20 ℃ for 3 hours, and naturally cooling the pit furnace to below 50 ℃ to be discharged out of the pit furnace;
step six: and (3) polishing and packaging, and self-checking the three-jaw inner gear ring by an operator to ensure that the three-jaw inner gear ring has no crack, no material shortage, no residual meat and no burr, if the three-jaw inner gear ring is qualified, packaging, sealing, drying and storing, otherwise, the three-jaw inner gear ring is a waste product.
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| CN109706372A (en) * | 2019-02-18 | 2019-05-03 | 益阳市再超粉末冶金有限公司 | A kind of sintering method of powdered metallurgical material gear |
| CN110004373A (en) * | 2019-02-21 | 2019-07-12 | 益阳市再超粉末冶金有限公司 | A method of gear is manufactured with antifriction material of powder metallurgy |
| CN110508822B (en) * | 2019-09-27 | 2021-08-27 | 苏州唯创特精密机械有限公司 | Gear ring preparation process |
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| KR20120007235A (en) * | 2010-07-14 | 2012-01-20 | 현대자동차주식회사 | Method of manufacturing sintered annulus gear for transmission |
| CN103084569B (en) * | 2013-01-04 | 2015-10-07 | 中南大学 | A kind of low-alloy content iron-based powder of additive activating and prepare the method for agglomerated material |
| CN103231052B (en) * | 2013-03-30 | 2015-08-05 | 安徽省恒宇粉末冶金有限公司 | A kind of powder metallurgy central gear and preparation method thereof |
| CN103639674B (en) * | 2013-12-04 | 2016-01-20 | 鞠小平 | The processing method of reductor ring gear |
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