CN105499588A - Powder metallurgy manufacturing technology of synchronizer gear hub - Google Patents

Powder metallurgy manufacturing technology of synchronizer gear hub Download PDF

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Publication number
CN105499588A
CN105499588A CN201510904002.8A CN201510904002A CN105499588A CN 105499588 A CN105499588 A CN 105499588A CN 201510904002 A CN201510904002 A CN 201510904002A CN 105499588 A CN105499588 A CN 105499588A
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CN
China
Prior art keywords
powder metallurgy
gear hub
blank
synchromesh gear
tooth
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Pending
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CN201510904002.8A
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Chinese (zh)
Inventor
陈珠洪
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Bi Dream Technology (shanghai) Composite Material Co Ltd
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Bi Dream Technology (shanghai) Composite Material Co Ltd
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Priority to CN201510904002.8A priority Critical patent/CN105499588A/en
Publication of CN105499588A publication Critical patent/CN105499588A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F1/00Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition
    • B22F1/0003Metallic powders per se; Mixtures of metallic powders; Metallic powders mixed with a lubricating or binding agent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12Both compacting and sintering
    • B22F3/16Both compacting and sintering in successive or repeated steps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F5/00Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08Manufacture 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
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/16Ferrous alloys, e.g. steel alloys containing copper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • B22F2003/247Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • B22F2003/248Thermal after-treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F2999/00Aspects linked to processes or compositions used in powder metallurgy

Abstract

The invention belongs to the technical field of powder metallurgy, and relates to a powder metallurgy manufacturing technology of a synchronizer gear hub. The powder metallurgy manufacturing technology comprises the steps that prepared raw material powder is placed into a press die cavity and pressed to form a blank, the blank is processed through air cooling to form a hardened body after the blank is sintered in an oxygen-free environment, and testing and packaging are conducted after finish machining of the hardened body is accomplished and burrs are brushed away. By the adoption of the powder metallurgy manufacturing technology, air-blast quenching is utilized under the condition of the high temperature during the later period of the sintering process of the blank, so that the number of steps is reduced, the dimensional accuracy of products is high, and the yield is high.

Description

A kind of powder metallurgy manufacturing process of synchromesh gear hub
Technical field
The present invention relates to powder metallurgical technology, particularly a kind of powder metallurgy manufacturing process of synchromesh gear hub.
Background technology
Synchromesh gear hub is the vitals in automobile gearbox, and due to its shape, desired strength is high, so usually adopt powder metallurgical technique shaping.Powder metallurgical technique has very high raw material utilization rate, and up to 90%, because certain porosity is contained in inside, not only reduce the weight of product, and hole can absorb vibration in the running, the lubricating oil in space can increase wearability and lubricity.
Have a lot of tooth-shape structure in synchromesh gear hub, synchromesh gear hub is also provided with keyway 1, the immediate tooth in keyway 1 both sides is distortion tooth 2, and other positions are orthodont 3, distortion tooth 2 and orthodont 3 profile of tooth identical (as shown in Figure 1) before sintering.But keyway 1 structure can cause the inhomogeneities of Stress Release, the deflection being specially distortion tooth 2 in keyway 1 both sides in sintering process is greater than the deflection of orthodont 3, makes keyway 1 open distortion, will cause shaping bad like this.In order to tackle this situation, in prior art, the powder metallurgy process of synchromesh gear hub is two-step sintering method: shaping → presintering → machined → double sintering → shaping → high-frequency quenching → cleaning → packaging.Adopt two-step sintering shapingly slow down to allow it in prior art, but shaping like this after shaping also will be relied on to improve profile accuracy, extend technological process, continuous production difference and add production cost.
Therefore, be necessary to provide a kind of new powder metallurgical technique to solve the problems referred to above.
Summary of the invention
Main purpose of the present invention is the powder metallurgy manufacturing process providing a kind of synchromesh gear hub.
The present invention is achieved through the following technical solutions above-mentioned purpose: a kind of powder metallurgy manufacturing process of synchromesh gear hub, and step comprises:
1. pressing step: the material powder prepared is added press die cavity, press molding, obtain blank after the demoulding;
2. sinter-hardened step: blank is added continuous sintering furnace, sinters in oxygen-free environment, carries out air-blast quenching then, and cooling velocity is 2.5-5 DEG C/s, obtains hardenite;
3. machining steps: be fixed on by hardenite on CNC equipment, is processed as on a small quantity and meets size and shape need product;
4. burr brushing step: carry out surface treatment to product by burr brushing equipment, removes burr, obtains product;
5. packaging step is checked: check product surface state, no defective product is packed.
Concrete, the mass percent of each composition of described raw material is graphite 0.5-0.8%, copper 1.3-2.5%, nickel 1-5%, molybdenum 1.2-4.5%, and all the other are iron.
Concrete, the pressure of described pressing step is 500-700MPa.
Concrete, described sintering temperature is 1100-1200 DEG C, and the time is 30-45min, and oxygen-free environment adopts hydrogen as protective gas.
Concrete, described air-cooled employing nitrogen is as cooling medium.
Further, blank shaping in described pressing step has keyway and some teeth, and described tooth is divided near the correction of the flank shape tooth of described keyway and the orthodont away from described keyway, and the profile of tooth of described correction of the flank shape tooth is less than the profile of tooth of described orthodont.
Further, described machining steps is omitted.
Adopt technique scheme, the beneficial effect of technical solution of the present invention is:
1, in present invention process blank section high temperature after sintering condition under utilize air-blast quenching, step is saved, and product size precision is high, and yield is high;
2, adopt the raw material of this composition proportion sinter-hardened effective, intensity is reliable;
3, under sintering process is in reducibility gas hydrogen shield, the oxidation of composition can fully be avoided like this;
4, adopt correction of the flank shape toothing can weaken the deformation at blank keyway place further, even can save presintering and shaping process.
Accompanying drawing explanation
Fig. 1 is the blank front view of original design;
Fig. 2 is the partial enlarged drawing of A Position Design difference in displaying chart 1;
Fig. 3 is the flow chart of this technique.
Numeral in figure:
1-keyway, 2-makes a variation tooth, 2 '-correction of the flank shape tooth, 3-orthodont.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1
1. pressing step: the material powder prepared according to 0.6% graphite, 1.5% bronze medal, 4% nickel, 0.5% molybdenum and 93.4% iron adds press die cavity, and press molding 600MPa, obtains blank after the demoulding;
2. sinter-hardened step: blank is added continuous sintering furnace, be heated to 1100 DEG C of sintering 30min under in hydrogen shield, cooling velocity is 2.5-5 DEG C/s, obtains hardenite;
3. machining steps: be fixed on by hardenite on CNC equipment, is processed as on a small quantity and meets size and shape need product;
4. burr brushing step: carry out surface treatment to product by burr brushing equipment, removes burr, obtains product;
5. packaging step is checked: check product surface state, no defective product is packed.
Embodiment 2
1. pressing step: the material powder prepared according to 0.5% graphite, 1.3% bronze medal, 3.5% nickel, 0.4% molybdenum and 94.3% iron adds press die cavity, and press molding 500MPa, obtains blank after the demoulding;
2. sinter-hardened step: blank is added continuous sintering furnace, be heated to 1100 DEG C of sintering 45min under in hydrogen shield, cooling velocity is 2.5-5 DEG C/s, obtains hardenite;
3. machining steps: be fixed on by hardenite on CNC equipment, is processed as on a small quantity and meets size and shape need product;
4. burr brushing step: carry out surface treatment to product by burr brushing equipment, removes burr, obtains product;
5. packaging step is checked: check product surface state, no defective product is packed.
Embodiment 3
1. pressing step: the material powder prepared according to 0.7% graphite, 1.7% bronze medal, 4.5% nickel, 0.6% molybdenum and 92.5% iron adds press die cavity, and press molding 700MPa, obtains blank after the demoulding;
2. sinter-hardened step: blank is added continuous sintering furnace, be heated to 1200 DEG C of sintering 40min under in hydrogen shield, cooling velocity is 2.5-5 DEG C/s, obtains hardenite;
3. machining steps: be fixed on by hardenite on CNC equipment, is processed as on a small quantity and meets size and shape need product;
4. burr brushing step: carry out surface treatment to product by burr brushing equipment, removes burr, obtains product;
5. packaging step is checked: check product surface state, no defective product is packed.
Embodiment 4
A powder metallurgy manufacturing process for synchromesh gear hub, step comprises:
1. pressing step: the material powder prepared according to 0.65% graphite, 2% bronze medal, 4% nickel, 1.4% molybdenum and 91.95% iron adds press die cavity, press molding 600MPa, obtain blank after the demoulding, blank has the correction of the flank shape 2 ' structure (as shown in Figure 2) being less than orthodont 3 profile of tooth;
2. sinter-hardened step: blank is added continuous sintering furnace, be heated to 1150 DEG C of sintering 30min under in hydrogen shield, cooling velocity is 2.5-5 DEG C/s, obtains hardenite;
4. burr brushing step: carry out surface treatment to product by burr brushing equipment, removes burr, obtains product;
5. packaging step is checked: check product surface state, no defective product is packed.
Embodiment 5
A powder metallurgy manufacturing process for synchromesh gear hub, step comprises:
1. pressing step: the material powder prepared according to 0.5% graphite, 1.5% bronze medal, 3.5% nickel, 1.2% molybdenum and 93.3% iron adds press die cavity, press molding 500MPa, obtain blank after the demoulding, blank has the correction of the flank shape tooth 2 ' structure (as shown in Figure 2) being less than orthodont 3 profile of tooth;
2. sinter-hardened step: blank is added continuous sintering furnace, be heated to 1150 DEG C of sintering 30min under in hydrogen shield, cooling velocity is 2.5-5 DEG C/s, obtains hardenite;
3. machining steps: be fixed on by hardenite on CNC equipment, is processed as on a small quantity and meets size and shape need product;
4. burr brushing step: by burr brushing equipment, surface treatment is carried out to hardenite, obtain product;
5. packaging step is checked: check product surface state, no defective product is packed.
Embodiment 6
A powder metallurgy manufacturing process for synchromesh gear hub, step comprises:
1. pressing step: the material powder prepared according to 0.8% graphite, 2.5% bronze medal, 4.5% nickel, 1.6% molybdenum and 90.6% iron adds press die cavity, press molding 600MPa, obtain blank after the demoulding, blank has the correction of the flank shape tooth 2 ' structure (as shown in Figure 2) being less than orthodont 3 profile of tooth;
2. sinter-hardened step: blank is added continuous sintering furnace, be heated to 1100 DEG C of sintering 30min under in hydrogen shield, cooling velocity is 2.5-5 DEG C/s, obtains hardenite;
3. machining steps: be fixed on by hardenite on CNC equipment, is processed as on a small quantity and meets size and shape need product;
4. burr brushing step: carry out surface treatment to product by burr brushing equipment, removes burr, obtains product;
5. packaging step is checked: check product surface state, no defective product is packed.
Sinter-hardenedly in the art complete continuously, processing continuity is good; Utilize air-blast quenching under sintering back segment hot conditions, efficiency is quick, save blank be infected with cooling fluid after drying steps; Air-cooled heat transfer is even, and cooling velocity is little in the distortion of 2.5-5 DEG C/s scope inner structure, and dimensional accuracy is high; Hydrogen is reducibility gas, under sintering process is in hydrogen shield, more fully can avoid the oxidation of composition compared to inert gas or nitrogen environment; Correction of the flank shape toothing can weaken the deformation at blank keyway place further, can save machining process, further speed production efficiency.
The synchromesh gear hub that the synchromesh gear hub processed by embodiment 1-6 and two-step sintering method obtain carries out product parameters contrast, and relevant parameter is as follows:
As seen from the above table, under not obvious product strength prerequisite of producing lower than prior art, the yield that improving technique obtains product increases significantly.
Above-described is only some embodiments of the present invention.For the person of ordinary skill of the art, without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.

Claims (7)

1. a powder metallurgy manufacturing process for synchromesh gear hub, is characterized in that step comprises:
1. pressing step: the material powder prepared is added press die cavity, press molding, obtain blank after the demoulding;
2. sinter-hardened step: blank is added continuous sintering furnace, sinters in oxygen-free environment, carries out air-blast quenching then, and cooling velocity is 2.5-5 DEG C/s, obtains hardenite;
3. machining steps: be fixed on by hardenite on CNC equipment, is processed as on a small quantity and meets size and shape need product;
4. burr brushing step: carry out surface treatment to product by burr brushing equipment, removes burr, obtains product;
5. packaging step is checked: check product surface state, no defective product is packed.
2. the powder metallurgy manufacturing process of a kind of synchromesh gear hub according to claim 1, is characterized in that: the mass percent of each composition of described raw material is graphite 0.5-0.8%, copper 1.3-2.5%, nickel 1-5%, molybdenum 1.2-4.5%, and all the other are iron.
3. the powder metallurgy manufacturing process of a kind of synchromesh gear hub according to claim 1, is characterized in that: the pressure of described pressing step is 500-700MPa.
4. the powder metallurgy manufacturing process of a kind of synchromesh gear hub according to claim 1, is characterized in that: described sintering temperature is 1100-1200 DEG C, and the time is 30-45min, and oxygen-free environment adopts hydrogen as protective gas.
5. the powder metallurgy manufacturing process of a kind of synchromesh gear hub according to claim 1, is characterized in that: described air-cooled employing nitrogen is as cooling medium.
6. according to the powder metallurgy manufacturing process of the arbitrary described a kind of synchromesh gear hub of claim 1-5, it is characterized in that: blank shaping in described pressing step has keyway and some teeth, described tooth is divided near the correction of the flank shape tooth of described keyway and the orthodont away from described keyway, and the profile of tooth of described correction of the flank shape tooth is less than the profile of tooth of described orthodont.
7. the powder metallurgy manufacturing process of a kind of synchromesh gear hub according to claim 6, is characterized in that: omit described machining steps.
CN201510904002.8A 2015-12-09 2015-12-09 Powder metallurgy manufacturing technology of synchronizer gear hub Pending CN105499588A (en)

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Application Number Priority Date Filing Date Title
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CN105499588A true CN105499588A (en) 2016-04-20

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107812948A (en) * 2017-11-08 2018-03-20 江苏智造新材有限公司 A kind of processing method of powder metallurgy synchronizer tooth hub
CN108994306A (en) * 2018-07-27 2018-12-14 广东东睦新材料有限公司 A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub
CN109702208A (en) * 2018-12-28 2019-05-03 江苏智造新材有限公司 A kind of double clutch automatic speed changing case synchromesh gear hub and its powder metallurgically manufacturing technique
CN109852897A (en) * 2018-12-28 2019-06-07 江苏智造新材有限公司 A kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs
CN110090962A (en) * 2018-01-31 2019-08-06 米巴精密零部件(中国)有限公司 Method for manufacturing synchronous hub

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107812948A (en) * 2017-11-08 2018-03-20 江苏智造新材有限公司 A kind of processing method of powder metallurgy synchronizer tooth hub
CN110090962A (en) * 2018-01-31 2019-08-06 米巴精密零部件(中国)有限公司 Method for manufacturing synchronous hub
CN108994306A (en) * 2018-07-27 2018-12-14 广东东睦新材料有限公司 A kind of sinter-hardened technique of powder metallurgy synchronizer tooth hub
CN109702208A (en) * 2018-12-28 2019-05-03 江苏智造新材有限公司 A kind of double clutch automatic speed changing case synchromesh gear hub and its powder metallurgically manufacturing technique
CN109852897A (en) * 2018-12-28 2019-06-07 江苏智造新材有限公司 A kind of method for preparing powder metallurgy of double clutch large torque automatic gear-box synchromesh gear hubs

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Application publication date: 20160420