CN117548678B - Powder metallurgy production line and production process for synchronizer gear sleeve - Google Patents
Powder metallurgy production line and production process for synchronizer gear sleeve Download PDFInfo
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- CN117548678B CN117548678B CN202410046804.9A CN202410046804A CN117548678B CN 117548678 B CN117548678 B CN 117548678B CN 202410046804 A CN202410046804 A CN 202410046804A CN 117548678 B CN117548678 B CN 117548678B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 67
- 238000003825 pressing Methods 0.000 claims abstract description 40
- 230000007704 transition Effects 0.000 claims abstract description 28
- 238000005245 sintering Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000009700 powder processing Methods 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims description 37
- 238000007654 immersion Methods 0.000 claims description 16
- 239000004014 plasticizer Substances 0.000 claims description 16
- 238000007493 shaping process Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 239000000654 additive Substances 0.000 claims description 12
- 239000000314 lubricant Substances 0.000 claims description 12
- 239000011812 mixed powder Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000003754 machining Methods 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000004381 surface treatment Methods 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000012188 paraffin wax Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000002923 metal particle Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B22F1/14—Treatment of metallic powder
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
Abstract
The invention belongs to the field of special devices for powder metallurgy, and particularly discloses a powder metallurgy production line and production process for a synchronizer gear sleeve, wherein the production line comprises a powder processing unit, a powder forming unit and a sintering furnace for producing formed parts, a plum blossom angle forming pressing group is arranged in the powder forming unit, and the Mei Jiao forming pressing group comprises an injection fixed die for inputting powder, a forming punch for supplying pressure and an inner circumference movable die for profiling products; when the in-process of shifting, after the inner and outer conical surfaces of synchronizer ring and bonding tooth laminate, contact with the shape that the transition circular arc angle of shifting brought at first, then add the contact bonding section to have the process of a circular arc transition, and increased the area of contact of shifting, when not influencing the feel, can improve the thrust that promotes the synchronizer ring, strengthen synchronous efficiency, carry out the preliminary treatment before the sintering, strengthen the position of plum blossom angle department again, improve the stable frequency of use of operation of shifting.
Description
Technical Field
The invention relates to the field of special devices for powder metallurgy, in particular to a powder metallurgy production line and a production process for a synchronizer gear sleeve.
Background
The synchronizer gear sleeve is provided with a sliding block groove, a back taper, a shifting fork groove and Mei Jiao, when an automobile shifts gears, the plum blossom angle surface of the gear sleeve is contacted with Mei Jiaomian of a combining tooth and then slides in smoothly, through analyzing synchronous axial component force and shifting ring component force, the plum blossom angle cut-in point position of the gear sleeve is contacted with a synchronizer gear ring, when two gears shift and three gears shift, the contact distance between the combining tooth of the gear sleeve and the gear ring of the three gears synchronizer is long, so that the axial thrust action time is long, when four gears shift and three gears shift, the contact distance between the combining tooth of the gear sleeve and the gear ring of the three gears synchronizer is short, the axial thrust action time is short, and because the end surface area of the gear sleeve is small, the wall is thin, the plum blossom angle position of the gear sleeve is difficult to process, and in order to improve the hand feeling when the synchronizing ring is attached to the inner and outer conical surfaces of the combining tooth, the plum blossom angle of the gear sleeve and the combining tooth angle of the synchronizing ring are often influenced, and the contact area of the plum blossom angle of the combining tooth angle of the synchronizing ring is small, and the contact area of the tooth sleeve is often caused by the thrust reduction of the tooth sleeve pushing the synchronizing ring, and the synchronization efficiency is influenced when the contact area of the two is small;
the powder metallurgy process is a process technology for manufacturing metal materials, composite materials and various products by taking metal powder as a raw material through forming and sintering, wherein proper metal powder is selected as the raw material, the commonly used metal powder comprises iron, steel, copper, aluminum and the like, the granularity and the components of the powder are required to be selected according to the requirements of producing tooth sleeves, the metal powder and various additives are finely mixed so as to realize uniform distribution of the additives in the metal powder, the aim of the mixing process is to improve the fluidity and the compactness in the forming process, thereby ensuring that the texture of a final finished product is more uniform and compact, the mixture is positioned in a mold for pressing, the pressed metal powder is subjected to high temperature through sintering and then subjected to surface treatment, and the preparation link tends to be integrated in the sintering process, so that the angular position of a plum at the tooth sleeve is not easy to control, and the use effect is easy to reduce.
Disclosure of Invention
The invention aims to provide a powder metallurgy production line for a synchronizer gear sleeve, which can improve the thrust for pushing a synchronizing ring and enhance the synchronizing efficiency by increasing the contact area of gear shifting without affecting the hand feeling, and further control the plum-blossom-angle position in the production process, so that the strength of the gear sleeve at the plum-blossom-angle position is improved, the stable use frequency of gear shifting operation is improved, and the problems in the background art can be effectively solved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a powder metallurgy production line for synchronizer tooth cover, the production line is including the powder processing unit, powder forming unit and the fritting furnace that are used for producing the shaping spare, be equipped with the shaping of plum blossom angle and press the group in the powder forming unit, mei Jiao shaping presses the group including the injection fixed mould piece that is used for the input powder, the shaping drift that is used for supplying pressure and the interior mould piece that moves that is used for profiling product, shaping drift bottom has the tooth is pressed to the both sides of a plurality of auxiliary shaping, the injection fixed mould piece with interior mould piece move and have a production between the mould piece tooth cover extrusion chamber of shaping spare, the raw materials that mix in the powder processing unit is located tooth cover extrusion intracavity is pressed, interior mould piece has a plurality of tooth, every all be equipped with on the tooth and add the contact combination section, add contact combination section both sides and be equipped with transition circular arc shift angle, add contact combination section the transition circular arc shift angle with tooth cover extrusion chamber combines out shaping spare and angle.
As still further aspects of the invention: the powder treatment unit is internally provided with an input cylinder for injecting the iron-based material and a reinforcing cylinder for adding auxiliary materials, wherein the auxiliary materials are carbon, copper, molybdenum and nickel.
As still further aspects of the invention: the forming part teeth are provided with top exposed angles, the top ends of the inner surrounding movable mould parts are provided with avoidance extending angles, a reinforcement immersing cavity is arranged between the top exposed angles and the avoidance extending angles, and the outer side end faces of the two side pressing teeth are matched with the inner side end faces of the reinforcement immersing cavity.
As still further aspects of the invention: the outside of shaping drift has the flow hole that is used for spouting plasticizer and lubricant, the flow hole with strengthen the immersion cavity correspondence, the plasticizer is paraffin.
As still further aspects of the invention: the forming punch is provided with a pressure giving piece for driving lifting movement, the pressure giving piece is connected with a telescopic rod for driving the inner circumference movable module to lift, and the inner circumference movable module is far away from the tooth sleeve extrusion cavity for demolding.
As still further aspects of the invention: the forming part is provided with plum-blossom-angle edges formed by the additionally-arranged contact combination section and the transition arc gear-shifting angle, and the number of the pressing teeth on the two sides is consistent with the number of teeth of the forming part.
As still further aspects of the invention: the two side edge pressing teeth are arranged in two groups, one group is positioned in the powder forming unit, the other group is positioned in the sintering furnace for hot pressing treatment, and the two side edge pressing teeth are opposite to the exposed top angle for increasing additives to promote the combination of metal particles.
As still further aspects of the invention: the avoidance extending angles and the top exposed angles are symmetrically distributed, and the avoidance extending angles are positioned at the tops of the additionally arranged contact combination section and the transition arc gear shifting angle.
As a still further scheme of the invention, the production process of the powder metallurgy production line for the synchronizer gear sleeve comprises the following production steps:
s1, mixing powder by the powder treatment unit, and inputting the mixed powder into the powder forming unit by the powder treatment unit;
s2, controlling the inner periphery movable mould piece to be positioned in the tooth sleeve extrusion cavity, wherein the mixed powder fills the tooth sleeve extrusion cavity;
s3, controlling the forming punch to move towards the injection fixed die part, pressing powder, placing the powder in the tooth sleeve extrusion cavity, simultaneously manufacturing a shape on the forming part by the additionally arranged contact combination section and the transition arc gear shift angle, and integrally shaping the shape of the synchronizer tooth sleeve by applying high pressure to the powder;
s4, spraying a plasticizer and a lubricant into the reinforced immersion cavity through the forming punch;
s5, controlling the inner periphery movable mould piece to leave the tooth sleeve extrusion cavity for demoulding;
s6, sleeving the preliminarily formed synchronizer teeth in the sintering furnace for sintering, and after the pre-treatment stage, the side edge pressing teeth are opposite to the exposed top angles, adding additives, and then fully sintering;
and S7, carrying out surface treatment after finishing the gear sleeve step formed at the bottom of the additionally arranged contact joint section by a machining cutter.
Compared with the prior art, the invention has the beneficial effects that:
the tooth sleeve is pressed by the inner circumference movable mould part, and forms a shape brought by additionally arranging a contact joint section and a transition arc gear shifting angle at the edge position of Mei Jiao, when the synchronous ring is attached to the inner conical surface and the outer conical surface of the joint tooth in the gear shifting process, the synchronous ring is firstly contacted with the shape brought by the transition arc gear shifting angle, and then the contact joint section is additionally arranged, so that the gear sleeve has a circular arc transition process, the gear shifting contact area is increased, the hand feeling is not influenced, the thrust for pushing the synchronous ring is improved, and the synchronous efficiency is enhanced;
the tooth is pressed by two sides in the reinforced immersion cavity to contact, mei Jiao edges of the tooth sleeve can be acted independently, pretreatment is carried out before sintering, the position of the plum blossom angle is reinforced again, and the plum blossom angle position is controlled in the production process, so that the strength of the plum blossom angle position of the tooth sleeve and the stable use frequency of gear shifting operation are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a powder metallurgy line for synchronizer gear sleeves;
FIG. 2 is a schematic diagram of the structure of a powder forming unit in a powder metallurgy line for synchronizer gear sleeves;
FIG. 3 is a schematic view of the structure of an injection molding member in a powder metallurgy line for synchronizer gear sleeve;
FIG. 4 is a schematic view of the structure of an inner movable module in a powder metallurgy production line for synchronizer gear sleeves;
in the figure: 1. a powder treatment unit; 2. a powder molding unit; 3. a sintering furnace; 4. mei Jiao forming a pressing group; 41. injecting a molding piece; 411. a tooth sleeve extrusion cavity; 42. a pressure imparting member; 43. forming a punch; 431. the two sides are pressed with teeth; 44. an inner movable module; 441. a contact combination section is additionally arranged; 442. transition arc shift angle; 443. an avoidance penetration angle; 5. a molding member; 51. a top exposed corner; 6. reinforcing the immersion cavity.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1 to 4, in an embodiment of the present invention, a powder metallurgy production line for a synchronizer gear sleeve includes a powder processing unit 1 for producing a molded part 5, a powder molding unit 2 and a sintering furnace 3, wherein a draft angle molding pressing set 4 is disposed in the powder molding unit 2, the draft angle molding pressing set 4 includes an injection fixed mold 41 for inputting powder, a molding punch 43 for supplying pressure and an inner movable mold 44 for profiling products, a plurality of side pressing teeth 431 for auxiliary molding are disposed at the bottom of the molding punch 43, a gear sleeve extrusion cavity 411 for producing the molded part 5 is disposed between the injection fixed mold 41 and the inner movable mold 44, raw materials mixed in the powder processing unit 1 are pressed in the gear sleeve extrusion cavity 411, the inner movable mold 44 has a plurality of teeth, each tooth is provided with an additional contact bonding section 441, two sides of the additional contact bonding section 441 are provided with transition arc shift angles 442, and the transition arc shift angles 442 are combined with the gear sleeve extrusion cavity 411 to form the molded part 5 and the draft angle.
By adopting the technical scheme: firstly, under the action of the powder treatment unit 1, the mixing preparation of the powder is controlled, and the powder is brought to a condition capable of being pressed. The powder treatment unit 1 is internally provided with an input cylinder for injecting iron-based materials and a reinforcing cylinder for adding auxiliary materials, wherein the auxiliary materials are carbon, copper, molybdenum and nickel, required powders are uniformly mixed according to the required proportion so as to ensure uniform components of a final product, the powders are fully mixed by utilizing mechanical means, when the materials are input through the input cylinder and the reinforcing cylinder, the input speed is controlled according to the addition amount, and the materials can be mixed together in the input process simultaneously, so that the mixing work can be facilitated. The powder processing unit 1 inputs the mixed powder into the powder forming unit 2, the powder forming unit 2 is internally provided with a plum-blossom-shaped forming pressing group 4, mei Jiao forming pressing group 4 comprises an injection fixed die member 41 for inputting the powder, a forming punch 43 for supplying pressure and an inner movable die member 44 for profiling products, the forming punch 43 is provided with a pressure giving member 42 for driving lifting movement, the forming punch 43 is controlled to press, and when the powder is positioned in a die, high pressure is applied to shape a synchronizer gear sleeve. The pressure giving member 42 is connected with a telescopic rod for driving the inner movable mold 44 to move up and down, the inner movable mold 44 is far away from the tooth sleeve extrusion cavity 411 for demolding, the telescopic rod controls the inner movable mold 44 to move, when the inner movable mold 44 is positioned in the tooth sleeve extrusion cavity 411, powder is filled in the tooth sleeve extrusion cavity 411, and after molding, the telescopic rod controls the inner movable mold 44 to leave the tooth sleeve extrusion cavity 411, so that demolding can be facilitated. The forming piece 5 teeth are provided with top exposed angles 51, the top end of the inner surrounding movable module 44 is provided with avoidance extending angles 443, a reinforced immersed cavity 6 is arranged between the top exposed angles 51 and the avoidance extending angles 443, the outer side end faces of the two side pressing teeth 431 are matched with the inner side end faces of the reinforced immersed cavity 6, the forming punch 43 moves, the two side pressing teeth 431 can be positioned in the reinforced immersed cavity 6, the avoidance extending angles 443 are in original machined shapes, the positions of the two side pressing teeth 431 can be avoided, and meanwhile, the top exposed angles 51 are opened to expand a space. The top exposed corner 51 is shaped by pressing, so that the machined top exposed corner 51 is convenient to transition in the gear shifting use process. The outside of shaping drift 43 has the flow hole that is used for spouting plasticizer and lubricant, and the flow hole is corresponding with strengthen the immersion cavity 6, and the plasticizer is paraffin, and the flow hole can be through the valve control process of opening and close, through the pipeline control to when both sides side pressure tooth 431 corresponds with strengthen the immersion cavity 6, can control shaping drift 43 to spout plasticizer and lubricant towards strengthening the immersion cavity 6 in, plasticizer and lubricant are selected as required, can further improve the formability of plum blossom angle position department, strengthen the intensity of suppression. The contact combination section 441 and the transition circular arc gear shifting angle 442 are additionally arranged to manufacture the shape on the forming piece 5, when the inner conical surface and the outer conical surface of the synchronizing ring are attached to the inner conical surface and the outer conical surface of the combination tooth in the gear shifting process, the synchronizing ring can be contacted with the shape brought by the transition circular arc gear shifting angle 442, and then the contact combination section 441 is additionally arranged in a facing manner, so that the process of circular arc transition is realized, the gear shifting contact area is increased, the hand feeling is not influenced, the thrust of the synchronizing ring is improved, and the synchronizing efficiency is enhanced. The preliminarily molded synchronizer gear sleeve is placed in the sintering furnace 3 for sintering, and after the additive is added in the pretreatment stage, the two side edge pressing teeth 431 are opposite to the top exposed angle 51, the additive can be carbon powder after being fully sintered, a certain amount of carbon powder is added to promote the combination of metal particles, the density and the strength of the molded part 5 are improved, the plum blossom angle position is controlled in the production process, and the plum blossom angle position is independently reinforced, so that the strength of the tooth sleeve plum blossom angle position and the stable use frequency of gear shifting operation are improved.
Example 2
Referring to fig. 1 to 4, in an embodiment of the present invention, a production process of a powder metallurgy production line for a synchronizer gear sleeve includes the following steps:
s1, mixing powder by a powder processing unit 1, and inputting the mixed powder into a powder forming unit 2 by the powder processing unit 1;
s2, controlling the inner movable mould member 44 to be positioned in the tooth sleeve extrusion cavity 411, wherein the mixed powder fills the tooth sleeve extrusion cavity 411;
s3, controlling the forming punch 43 to move towards the injection molding piece 41, pressing powder, placing the powder in the tooth sleeve extrusion cavity 411, simultaneously adding the contact joint section 441 and the transition arc gear shift angle 442 to manufacture a shape on the forming piece 5, and integrally shaping the shape of the synchronizer tooth sleeve by applying high pressure to the powder;
s4, spraying a plasticizer and a lubricant into the reinforced immersion cavity 6 through the forming punch 43;
s5, controlling the inner movable mould member 44 to leave the tooth sleeve extrusion cavity 411 for demoulding;
s6, placing the preliminarily molded synchronizer gear sleeve into a sintering furnace 3 for sintering, and after the pre-treatment stage, the side pressing teeth 431 at the two sides are opposite to the exposed top angle 51, adding additives, and then fully sintering;
and S7, carrying out surface treatment after finishing the gear sleeve step formed at the bottom of the additionally arranged contact joint section 441 by a machining cutter.
By adopting the technical scheme: the powder is mixed by the powder processing unit 1, the mixed powder is input into the powder forming unit 2 by the powder processing unit 1, the inner circumference movable mould 44 is controlled to be positioned in the tooth sleeve extrusion cavity 411, the mixed powder fills the tooth sleeve extrusion cavity 411, the forming punch 43 is controlled to move towards the injection fixed mould 41 to press the powder, the powder is placed in the tooth sleeve extrusion cavity 411, meanwhile, the contact bonding section 441 and the transition circular arc shift angle 442 are additionally arranged to manufacture a shape on the forming piece 5, the whole powder is shaped by applying high pressure, the plasticizer and the lubricant are sprayed into the reinforced immersion cavity 6 by the forming punch 43, the inner circumference movable mould 44 is controlled to leave the tooth sleeve extrusion cavity 411 to be demoulded, the preliminarily formed synchronizer tooth sleeve is placed in the sintering furnace 3 to be sintered, after the additive is added, the tooth sleeve 431 is fully added to the exposed angle 51 at the top, and the surface treatment is carried out after the tooth sleeve fine step formed at the bottom of the contact bonding section 441 is additionally arranged by the machining cutter.
The working principle of the invention is as follows: under the action of the powder treatment unit 1, the mixing preparation of the powder is controlled, and the powder is brought to a condition where it can be pressed. The required powder is uniformly mixed according to the required proportion to ensure that the components of the final product are uniform, the powder is fully mixed by utilizing a mechanical means, when materials are put into the feeding cylinder and the reinforcing cylinder, the feeding speed is controlled according to the adding amount, and simultaneously, the materials can be mixed together in the feeding process, so that the mixing work can be facilitated. The powder processing unit 1 inputs the mixed powder into the powder forming unit 2, and the powder forming unit 2 is provided therein with a fillet forming press set 4, mei Jiao forming press set 4 including an injection molding die 41 for inputting the powder, a forming punch 43 for supplying pressure, and an inner peripheral moving die 44 for profiling the product, and when the powder is located in the mold, high pressure is applied to mold the shape of the synchronizer gear sleeve. The pressure giving member 42 is connected with a telescopic rod for driving the inner movable mold 44 to move up and down, the inner movable mold 44 is far away from the tooth sleeve extrusion cavity 411 for demolding, the telescopic rod controls the inner movable mold 44 to move, when the inner movable mold 44 is positioned in the tooth sleeve extrusion cavity 411, powder is filled in the tooth sleeve extrusion cavity 411, and after molding, the telescopic rod controls the inner movable mold 44 to leave the tooth sleeve extrusion cavity 411, so that demolding can be facilitated. The outer end surfaces of the two side edge pressing teeth 431 are matched with the inner end surface of the reinforced immersion cavity 6, the forming punch 43 moves, the two side edge pressing teeth 431 can be located in the reinforced immersion cavity 6, the avoidance extending angle 443 is the original machined shape, the positions of the two side edge pressing teeth 431 can be avoided, and meanwhile the top exposed angle 51 is opened to expand the space. The top exposed corner 51 is shaped by pressing, so that the machined top exposed corner 51 is convenient to transition in the gear shifting use process. The outside of the forming punch 43 has a flow hole for spraying plasticizer and lubricant, the flow hole corresponds to the reinforcement immersion cavity 6, the plasticizer is paraffin, and when the side edge pressing teeth 431 correspond to the reinforcement immersion cavity 6, the forming punch 43 can be controlled to spray plasticizer and lubricant into the reinforcement immersion cavity 6, the plasticizer and the lubricant are selected according to the requirement, the formability of the plum corner position can be further improved, and the pressed strength is enhanced. The contact combination section 441 and the transition circular arc gear shifting angle 442 are additionally arranged to manufacture the shape on the forming piece 5, when the inner conical surface and the outer conical surface of the synchronizing ring are attached to the inner conical surface and the outer conical surface of the combination tooth in the gear shifting process, the synchronizing ring can be contacted with the shape brought by the transition circular arc gear shifting angle 442, and then the contact combination section 441 is additionally arranged in a facing manner, so that the process of circular arc transition is realized, the gear shifting contact area is increased, the hand feeling is not influenced, the thrust of the synchronizing ring is improved, and the synchronizing efficiency is enhanced. The preliminarily molded synchronizer gear sleeve is placed in a sintering furnace 3 for sintering, the gear sleeve step formed at the bottom of the additionally-arranged contact combination section 441 is subjected to surface treatment by a machining cutter after the additive is added and fully sintered, and the gear sleeve is subjected to surface treatment after the gear sleeve is subjected to surface finish machining by the aid of the machining cutter after the additive is added and pressed on the gear teeth 431 at the two sides opposite to the exposed top angle 51.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. A powder metallurgy production line for synchronizer tooth sleeves, which comprises a powder processing unit (1), a powder forming unit (2) and a sintering furnace (3) for producing forming pieces (5), and is characterized in that a plum blossom angle forming pressing group (4) is arranged in the powder forming unit (2), the Mei Jiao forming pressing group (4) comprises an injection fixed die piece (41) for inputting powder, a forming punch (43) for supplying pressure and an inner circumference movable die piece (44) for profiling products, a plurality of auxiliary forming two-side pressing teeth (431) are arranged at the bottom of the forming punch (43), a tooth sleeve extrusion cavity (411) for producing the forming pieces (5) is arranged between the injection fixed die piece (41) and the inner circumference movable die piece (44), raw materials mixed in the powder processing unit (1) are positioned in the tooth sleeve extrusion cavity (411) for pressing, the inner circumference movable die piece (44) is provided with a plurality of teeth, each tooth is provided with a contact bonding section (441), a contact bonding section (441) is arranged on each tooth, and a gear change transition section (442) is additionally arranged on each tooth sleeve extrusion cavity (441) for forming a gear change-over section (442), and a gear change transition section (442) is additionally arranged on each tooth sleeve extrusion cavity (442) for forming a gear change-over section (442);
the forming part (5) is provided with a top exposed angle (51) on the tooth, the top end of the inner surrounding movable mould (44) is provided with an avoidance extending angle (443), a reinforcement immersed cavity (6) is arranged between the top exposed angle (51) and the avoidance extending angle (443), and the outer side end surfaces of the two side edge pressing teeth (431) are matched with the inner side end surfaces of the reinforcement immersed cavity (6); the forming part (5) is provided with plum-blossom-angle edges formed by the additionally-arranged contact combination section (441) and the transition arc gear-shifting angle (442), and the number of the pressing teeth (431) at the two sides is consistent with the number of teeth of the forming part (5); two groups of side edge pressing teeth (431) are arranged, one group of the two groups of side edge pressing teeth is positioned in the powder forming unit (2), the other group of the two groups of side edge pressing teeth is positioned in the sintering furnace (3) for hot pressing treatment, and the two side edge pressing teeth (431) are opposite to the top exposed angle (51) for increasing additives to promote the combination of metal particles; the avoidance extending angles (443) and the top exposed angles (51) are symmetrically distributed, and the avoidance extending angles (443) are positioned at the tops of the additionally arranged contact combination section (441) and the transition arc gear shifting angle (442).
2. A powder metallurgy production line for synchronizer gear sleeves according to claim 1, characterized in that the powder processing unit (1) has an input cylinder for injecting iron-based material and a reinforcing cylinder for adding auxiliary materials, the auxiliary materials being carbon, copper, molybdenum and nickel.
3. A powder metallurgy line for synchronizer gear sleeves according to claim 1, characterized in that the outside of the forming punch (43) has flow holes for injecting plasticizer and lubricant, the flow holes corresponding to the reinforcing immersion cavity (6), the plasticizer being paraffin wax.
4. A powder metallurgy production line for synchronizer gear sleeves according to claim 1, characterized in that the forming punch (43) is provided with a pressure giving piece (42) for driving lifting movement, the pressure giving piece (42) is connected with a telescopic rod for driving the inner movable module (44) to lift, and the inner movable module (44) is far away from the gear sleeve extrusion cavity (411) for demoulding.
5. A process for the production of a powder metallurgy line for synchronizer gear sleeves according to any one of claims 1 to 4, characterized in that: the method comprises the following production steps:
s1, mixing powder by the powder processing unit (1), and inputting the mixed powder into the powder forming unit (2) by the powder processing unit (1);
s2, controlling the inner periphery movable module (44) to be positioned in the tooth sleeve extrusion cavity (411), wherein the mixed powder fills the tooth sleeve extrusion cavity (411);
s3, controlling the forming punch (43) to move towards the injection fixed die piece (41), pressing powder, placing the powder in the tooth sleeve extrusion cavity (411), simultaneously manufacturing a shape on the forming piece (5) by the additionally arranged contact combining section (441) and the transition circular arc gear shifting angle (442), and integrally shaping the shape of the synchronizer tooth sleeve by applying pressure;
s4, spraying a plasticizer and a lubricant into the reinforced immersion cavity (6) through the forming punch (43);
s5, controlling the inner periphery movable module (44) to leave the tooth sleeve extrusion cavity (411) for demolding;
s6, sleeving the preliminarily formed synchronizer teeth in the sintering furnace (3) for sintering, and after the pre-treatment stage, enabling the two side edge pressing teeth (431) to be opposite to the top exposed angle (51), adding an additive, and then fully sintering;
and S7, carrying out surface treatment after finishing the gear sleeve step formed at the bottom position of the additionally arranged contact combination section (441) by a machining cutter.
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