CN105643218A - Machining method of gear parts of gearbox - Google Patents
Machining method of gear parts of gearbox Download PDFInfo
- Publication number
- CN105643218A CN105643218A CN201410644341.2A CN201410644341A CN105643218A CN 105643218 A CN105643218 A CN 105643218A CN 201410644341 A CN201410644341 A CN 201410644341A CN 105643218 A CN105643218 A CN 105643218A
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- conducted
- quenching
- carburizing
- temperature
- roughness
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- 238000003754 machining Methods 0.000 title abstract 5
- 238000010791 quenching Methods 0.000 claims abstract description 16
- 230000000171 quenching Effects 0.000 claims abstract description 16
- 238000005255 carburizing Methods 0.000 claims abstract description 13
- 238000005242 forging Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000005496 tempering Methods 0.000 claims abstract description 5
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 238000007689 inspection Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0nMS4wJyBlbmNvZGluZz0naXNvLTg4NTktMSc/Pgo8c3ZnIHZlcnNpb249JzEuMScgYmFzZVByb2ZpbGU9J2Z1bGwnCiAgICAgICAgICAgICAgeG1sbnM9J2h0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnJwogICAgICAgICAgICAgICAgICAgICAgeG1sbnM6cmRraXQ9J2h0dHA6Ly93d3cucmRraXQub3JnL3htbCcKICAgICAgICAgICAgICAgICAgICAgIHhtbG5zOnhsaW5rPSdodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rJwogICAgICAgICAgICAgICAgICB4bWw6c3BhY2U9J3ByZXNlcnZlJwp3aWR0aD0nMzAwcHgnIGhlaWdodD0nMzAwcHgnIHZpZXdCb3g9JzAgMCAzMDAgMzAwJz4KPCEtLSBFTkQgT0YgSEVBREVSIC0tPgo8cmVjdCBzdHlsZT0nb3BhY2l0eToxLjA7ZmlsbDojRkZGRkZGO3N0cm9rZTpub25lJyB3aWR0aD0nMzAwLjAnIGhlaWdodD0nMzAwLjAnIHg9JzAuMCcgeT0nMC4wJz4gPC9yZWN0Pgo8dGV4dCB4PScxMDAuNScgeT0nMTcwLjAnIGNsYXNzPSdhdG9tLTAnIHN0eWxlPSdmb250LXNpemU6NDBweDtmb250LXN0eWxlOm5vcm1hbDtmb250LXdlaWdodDpub3JtYWw7ZmlsbC1vcGFjaXR5OjE7c3Ryb2tlOm5vbmU7Zm9udC1mYW1pbHk6c2Fucy1zZXJpZjt0ZXh0LWFuY2hvcjpzdGFydDtmaWxsOiNFODQyMzUnID5IPC90ZXh0Pgo8dGV4dCB4PScxMjYuMScgeT0nMTg2LjAnIGNsYXNzPSdhdG9tLTAnIHN0eWxlPSdmb250LXNpemU6MjZweDtmb250LXN0eWxlOm5vcm1hbDtmb250LXdlaWdodDpub3JtYWw7ZmlsbC1vcGFjaXR5OjE7c3Ryb2tlOm5vbmU7Zm9udC1mYW1pbHk6c2Fucy1zZXJpZjt0ZXh0LWFuY2hvcjpzdGFydDtmaWxsOiNFODQyMzUnID4yPC90ZXh0Pgo8dGV4dCB4PScxMzguMCcgeT0nMTcwLjAnIGNsYXNzPSdhdG9tLTAnIHN0eWxlPSdmb250LXNpemU6NDBweDtmb250LXN0eWxlOm5vcm1hbDtmb250LXdlaWdodDpub3JtYWw7ZmlsbC1vcGFjaXR5OjE7c3Ryb2tlOm5vbmU7Zm9udC1mYW1pbHk6c2Fucy1zZXJpZjt0ZXh0LWFuY2hvcjpzdGFydDtmaWxsOiNFODQyMzUnID5PPC90ZXh0Pgo8L3N2Zz4K data:image/svg+xml;base64,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 O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000005422 blasting Methods 0.000 abstract 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials 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O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 238000003860 storage Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 206010011376 Crepitations Diseases 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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 [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
Abstract
The invention discloses a machining method of gear parts of a gearbox. The machining method is characterized by comprising the following steps that (1) the material 20CrMnTi is selected; (2) furnace charging and heating are conducted; (3) forging is conducted; (4) shot blasting is conducted for the first time; (5) rough machining is conducted; (6) normalizing is conducted; (7) gear hobbing is conducted; (8) gear shaving is conducted; (9) deburring and cleaning are conducted; (10) carburizing and quenching are conducted; (11) tempering is conducted; (12) shot blasting is conducted for the second time; (13) an inner hole is ground; and (14) rust protection, checking, packaging and storage are conducted sequentially. According to the machining method of the gear parts of the gearbox, the surface hardness is 58-62 HRC after carburizing and quenching and low-temperature tempering are conducted, the hardness of the core is 35-42 HRC, and the machinability of the 20CrMnTi is improved through normalizing after forging; in addition, cooling and quenching can be conducted directly after carburizing, the carburizing speed is high, transition layers are uniform, the deformation amount is small after carburizing, and the advantages of being capable of bearing high-speed moderate load and impact, resistant to friction and the like are achieved.
Description
Technical field
The invention belongs to thermal treatment process, specifically a kind of gearbox gear method of processing parts.
Background technology
In the prior art, a kind of gearbox gear, its material is 20CrMnTi, it is a kind of converted steel, converted steel be generally carbon content be 0.17%��0.24% soft steel be that its hardening capacity is higher, ensureing in through hardening situation, there is higher intensity and toughness, particularly there is higher low-temperature impact toughness, so it manufactures gearbox gear part through to be usually used on processing automobile multiplex, but in processing treatment process, technology controlling and process is not good, can there is carburizing rear surface and crackle occurs, and centre hardness is inadequate, infiltration layer is uneven, deformation defect after quenching. For solving the problem, it is necessary to a kind of gearbox gear method of processing parts, makes the tooth face hardness of gearbox gear part and periphery hardness all can reach processing request.
Summary of the invention
In view of the deficiency that prior art exists, it is an object of the invention to propose a kind of gearbox gear method of processing parts, eliminate the negative impact of speed of cooling when being quenched by product and hardening capacity, make the tooth face hardness of gearbox gear part and periphery hardness all can reach processing request.
The technical scheme realizing the object of the invention is as follows:
A kind of gearbox gear method of processing parts, described gearbox gear material is 20CrMnTi, it is characterised in that, this working method comprises the following steps:
(1) selection: select the trade mark to be 20CrMnTi;
(2) shove charge heating: heating in process furnace, Heating temperature is 850��1200 DEG C, is incubated 8��10 hours;
(3) forge: die forging machine carries out twice upsetting pull, ensure that upsetting pull ratio is for the first time: 1.1��jumping-up ratio��1.6,1.3��pull out long ratio��2.5, second time upsetting pull ratio is: 1.1��jumping-up is than��1.3,1.4��pull out long ratio��2.5, keep forging temperature 850��1200 DEG C, final forging temperature >=720;
(4) first Shot Blastings;
(5) first roughing, then precision machined surface, roughness Ra is less than 1.6um;
(6) normalizing treatment: normalizing temperature 850��950 DEG C;
(7) gear hobbing process: make the roughness of the lower gear case after processing be: Ra < 6.3 ��m;
(8) Shaving Process: make the roughness of the lower gear case after processing be: Ra < 1.6 ��m;
(9) deburring is cleaned: the lower gear case after precision work is carried out deburring cleaning;
(10) carburizing and quenching: quenching temperature 850��950 DEG C, the cool time 60��90min, quenching medium is water or oil;
(11) temper: tempering temperature 150��220 DEG C;
(12) the 2nd Shot Blastings;
(13) inner hole grinding, makes the roughness of the lower gear case after processing be: Ra < 1.6 ��m;
(14) antirust successively, inspection, packaging, warehouse-in.
A kind of gearbox gear method of processing parts of the present invention, strictly each stage process parameter is controlled, after carburizing and quenching low-temperaturetempering, surface hardness is 58��62HRC, and centre hardness is 35��42HRC, 20CrMnTi improves its machinability with normalizing after forging, in addition, quenching of can directly lowering the temperature after carburizing, and carburizing speed is very fast, transition layer is relatively even, is out of shape little can bearing at a high speed and carries and the advantage such as impact and rub resistance after carburizing and quenching.
Embodiment
Below in conjunction with embodiment, the invention will be further described, and its operation steps is as follows:
A kind of gearbox gear method of processing parts, described gearbox gear material is 20CrMnTi, and this working method comprises the following steps:
(1) selection: select the trade mark to be 20CrMnTi;
(2) shove charge heating: heating in process furnace, Heating temperature is 850��1200 DEG C, is incubated 8��10 hours;
(3) forge: die forging machine carries out twice upsetting pull, ensure that upsetting pull ratio is for the first time: 1.1��jumping-up ratio��1.6,1.3��pull out long ratio��2.5, second time upsetting pull ratio is: 1.1��jumping-up is than��1.3,1.4��pull out long ratio��2.5, keep forging temperature 850��1200 DEG C, final forging temperature >=720;
(4) first Shot Blastings;
(5) first roughing, then precision machined surface, roughness Ra is less than 1.6um;
(6) normalizing treatment: normalizing temperature 850��950 DEG C;
(7) gear hobbing process: make the roughness of the lower gear case after processing be: Ra < 6.3 ��m;
(8) Shaving Process: make the roughness of the lower gear case after processing be: Ra < 1.6 ��m;
(9) deburring is cleaned: the lower gear case after precision work is carried out deburring cleaning;
(10) carburizing and quenching: quenching temperature 850��950 DEG C, the cool time 60��90min, quenching medium is water or oil;
(11) temper: tempering temperature 150��220 DEG C;
(12) the 2nd Shot Blastings;
(13) inner hole grinding, makes the roughness of the lower gear case after processing be: Ra < 1.6 ��m;
(14) antirust successively, inspection, packaging, warehouse-in.
Claims (1)
1. a gearbox gear method of processing parts, it is characterised in that, this working method comprises the following steps:
(1) selection: select the trade mark to be 20CrMnTi;
(2) shove charge heating: heating in process furnace, Heating temperature is 850��1200 DEG C, is incubated 8��10 hours;
(3) forge: die forging machine carries out twice upsetting pull, ensure that upsetting pull ratio is for the first time: 1.1��jumping-up ratio��1.6,1.3��pull out long ratio��2.5, second time upsetting pull ratio is: 1.1��jumping-up is than��1.3,1.4��pull out long ratio��2.5, keep forging temperature 850��1200 DEG C, final forging temperature >=720;
(4) first Shot Blastings;
(5) first roughing, then precision machined surface, roughness Ra is less than 1.6um;
(6) normalizing treatment: normalizing temperature 850��950 DEG C;
(7) gear hobbing process: make the roughness of the lower gear case after processing be: Ra < 6.3 ��m;
(8) Shaving Process: make the roughness of the lower gear case after processing be: Ra < 1.6 ��m;
(9) deburring is cleaned: the lower gear case after precision work is carried out deburring cleaning;
(10) carburizing and quenching: quenching temperature 850��950 DEG C, the cool time 60��90min, quenching medium is water or oil;
(11) temper: tempering temperature 150��220 DEG C;
(12) the 2nd Shot Blastings;
(13) inner hole grinding, makes the roughness of the lower gear case after processing be: Ra < 1.6 ��m;
(14) antirust successively, inspection, packaging, warehouse-in.
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| CN201410644341.2A CN105643218A (en) | 2014-11-14 | 2014-11-14 | Machining method of gear parts of gearbox |
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