CN106736321A - A kind of 20Cr cam cuttings technique - Google Patents

A kind of 20Cr cam cuttings technique Download PDF

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Publication number
CN106736321A
CN106736321A CN201611268044.8A CN201611268044A CN106736321A CN 106736321 A CN106736321 A CN 106736321A CN 201611268044 A CN201611268044 A CN 201611268044A CN 106736321 A CN106736321 A CN 106736321A
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CN
China
Prior art keywords
cam
treatment
carried
grinding
technique
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611268044.8A
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Chinese (zh)
Inventor
高仲华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Borun Mould Co Ltd
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Chongqing Borun Mould Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing Borun Mould Co Ltd filed Critical Chongqing Borun Mould Co Ltd
Priority to CN201611268044.8A priority Critical patent/CN106736321A/en
Publication of CN106736321A publication Critical patent/CN106736321A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/14Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels

Abstract

Cam drive is the important component in machine driving, particularly in the manufacture of some fixtures, the handling and clamping of workpiece is generally carried out by the way of cam clamping.Cam structure generally relies on the type face of cam to transmit power, so in the fabrication process in transmittance process, requirement to cam type surface is higher, not exclusively size requirement, while also have requirement very high to surface roughness, in existing processing, it is general to use grinding as last procedure, but because the type face of cam is special, particularly when the lift section of cam is ground, easily there is crackle, in existing processing, the probability for crackle occur is 8%.A kind of 20Cr cam cuttings technique, comprises the following steps:Blank forming;It is rough turn;Milling cam contour;Carburizing;Half smart car;Quenching;Smart car;Corase grind cam;Tempering;Fine grinding cam;Pincers worker.

Description

A kind of 20Cr cam cuttings technique
Technical field
The present invention relates to machining technology field, and in particular to a kind of 20Cr cam cuttings technique.
Background technology
Cam drive is the important component in machine driving, particularly in the manufacture of some fixtures, generally using cam folder Tight mode carries out the handling and clamping of workpiece.Cam structure generally relies on the type face of cam to transmit in transmittance process Power, so in the fabrication process, the requirement to cam type surface is higher, not exclusively size requirement, while to surface roughness Also there is requirement very high, it is general to use grinding as last procedure in existing processing, but because the type face of cam is special Very, particularly easily there is crackle when the lift section of cam is ground, in existing processing, the probability for crackle occur is 8%.
The content of the invention
In order to solve the problems, such as crackle easily occur during existing cam cutting, it is convex that the present invention provides a kind of 20Cr steels Wheel processing technology.
The present invention is achieved by the following technical solution:A kind of 20Cr steels cam cutting technique, including following step Suddenly:
S1:Blank forming, the blank with cam contour is formed by forging or casting;
S2:It is rough turn, two end faces and endoporus of roughing cam on lathe;
S3:Milling cam contour, the profile of machining cam on milling machine or machining center;
S4:Carburizing, Carburization Treatment is carried out to cam contour surface;
S5:Half smart car, two end faces and endoporus of semifinishing cam on lathe;
S6:Quenching, Quenching Treatment is carried out by the cam after step S5 treatment;
S7:Smart car, finishes two end faces and endoporus of cam on lathe;
S8:Corase grind cam, roughly grinds the type face of cam on grinding machine;
S9:Tempering, temper is carried out by the cam after step S8 treatment;
S10:Fine grinding cam, fine grinding treatment is carried out by the cam after step S9 treatment;
S11:Pincers worker, deburring is carried out by the cam after step S10 treatment.
Further, the temper is lonneal treatment, and the temperature is 180 DEG C~200 DEG C, insulation 3 Hour~4 hours.
Further, it is described fine grinding cam when grinding parameter be emery wheel abrasive material be cubic boron nitride, linear velocity 60m/s~ 80m/s, radial feeds 0.003mm/r~0.007mm/r, coolant is Aquatex3380.
The beneficial effect comprise that:By the rough turn roughing standard for obtaining cam;Origin reference location is obtained with after rough turn Milling cam contour is carried out, the type face of cam is obtained;The cam obtained after milling cam contour is carried out into carburizing, cam face is improved C content;Half smart car is carried out to the cam after carburizing, the carburized layer of part surface is removed, only retains the carburized layer of cam type surface;Connect And cam is quenched, improve the hardness of carburizing layer surface, while also can guarantee that the endoporus of cam has toughness higher;Essence Car, is that the cam after quenching is modified, it is determined that the benchmark of finishing;Corase grind cam, grinding is carried out to cam type surface, In order to prevent because stock removal is excessive in grinding process, the instantaneous temperature for causing cam type surface to be contacted with emery wheel is too high, formation the Secondary quenching, produces grinding crack, so carrying out temper to cam after cam is roughly ground, is allowed inside cam by tempering Tissue evenly, then carries out fine grinding cam type surface;Pincers worker deburring is carried out after fine grinding, the processing of whole cam is completed.According to Above-mentioned technique, solves the problems, such as easily crackle occur during existing cam cutting.
Brief description of the drawings
Fig. 1 is a kind of camshaft part schematic diagram of 20Cr steels cam cutting technique of the invention.
Fig. 2 is a kind of 20Cr steels cam cutting process flow diagram of the invention.
Specific embodiment
To describe in detail in conjunction with specific embodiments with reference to the accompanying drawings below:
A kind of 20Cr steels cam cutting technique, comprises the following steps:
S1:Blank forming, the blank with cam contour is formed by forging or casting;
S2:It is rough turn, two end faces and endoporus of roughing cam on lathe;
S3:Milling cam contour, the profile of machining cam on milling machine or machining center;
S4:Carburizing, Carburization Treatment is carried out to cam contour surface;
S5:Half smart car, two end faces and endoporus of semifinishing cam on lathe;
S6:Quenching, Quenching Treatment is carried out by the cam after step S5 treatment;
S7:Smart car, finishes two end faces and endoporus of cam on lathe;
S8:Corase grind cam, roughly grinds the type face of cam on grinding machine;
S9:Tempering, temper is carried out by the cam after step S8 treatment;
S10:Fine grinding cam, fine grinding treatment is carried out by the cam after step S9 treatment;
S11:Pincers worker, deburring is carried out by the cam after step S10 treatment.
In practice, the material of cam is 20Cr to the present invention, and radius of cam base-circle is R50mm, and cam eccentricity is 23mm, tip circle radius is R68mm, center-hole diameter φ 38mm.By the rough turn roughing standard for obtaining cam;In the present embodiment, Using common lathe(C6130)It is processed, being positioned on the basis of two end faces and centre bore of cam after rough turn is carried out Milling cam contour, in the present embodiment, milling is carried out using milling-lathe machining center, obtains the type face of cam;It is convex after by milling The cam obtained after wheel profile carries out carburizing, improves the C content of cam face, in the present embodiment, carburizing thickness 0.5mm;It is right Cam after carburizing carries out half smart car, removes the carburized layer of part surface, only retains the carburized layer of cam type surface;Half smart car is followed by And cam is quenched, improve the hardness of carburizing layer surface, while also can guarantee that the endoporus of cam has toughness higher; Smart car is carried out after quenched, is that the cam after quenching is modified, it is determined that finishing benchmark, same smart car cam face and Endoporus is to drawing size;Corase grind cam, grinding is carried out to cam type surface, in order to prevent in grinding process because stock removal mistake Greatly, the instantaneous temperature for causing cam type surface to be contacted with emery wheel is too high, forms second and quenches, and grinding crack is produced, so thick Temper is carried out to cam after mill cam, the tissue allowed inside cam by tempering evenly, then carries out fine grinding cam type Face;Pincers worker deburring is carried out after fine grinding, the processing of whole cam is completed.Nearly 360 of camshaft is processed according to above-mentioned technique, Occur crackle no more than 5, it is 1.38% the probability of crackle occur, at the same crack length 8mm, depth 2mm with It is interior.Solve the problems, such as easily crackle occur during existing cam cutting, be effectively guaranteed product quality and product is qualified Rate.
Further, uniform in order to ensure the stress after being tempered inside cam, the temper is lonneal treatment, The temperature is 180 DEG C~200 DEG C, is incubated 3 hours~4 hours, and in the present embodiment, temperature is 190 DEG C, insulation 3.5 hours time, cam type surface is detected after tempering is organized as tempering fine martensite+retained austenite+granular and a small amount of small Strip and block carbide, with preferable plasticity and toughness.
Further, in order to reduce grinding produce stress, during the fine grinding cam grinding parameter for emery wheel abrasive material be vertical Square boron nitride, linear velocity 60m/s~80m/s, radial feeds 0.003mm/r~0.007mm/r, coolant is Aquatex3380, in the present embodiment, the linear velocity 70m/s of emery wheel, radial feeds 0.005mm/r.
It should be understood that embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it is to be understood that readding Read after the content of instruction of the present invention, those skilled in the art can make any various changes and modification to the present invention, these The equivalent form of value equally falls within the application appended claims and is limited.

Claims (3)

1. a kind of 20Cr cam cuttings technique, it is characterised in that comprise the following steps:
S1:Blank forming, the blank with cam contour is formed by forging or casting;
S2:It is rough turn, two end faces and endoporus of roughing cam on lathe;
S3:Milling cam contour, the profile of machining cam on milling machine or machining center;
S4:Carburizing, Carburization Treatment is carried out to cam contour surface;
S5:Half smart car, two end faces and endoporus of semifinishing cam on lathe;
S6:Quenching, Quenching Treatment is carried out by the cam after step S5 treatment;
S7:Smart car, finishes two end faces and endoporus of cam on lathe;
S8:Corase grind cam, roughly grinds the type face of cam on grinding machine;
S9:Tempering, temper is carried out by the cam after step S8 treatment;
S10:Fine grinding cam, fine grinding treatment is carried out by the cam after step S9 treatment;
S11:Pincers worker, deburring is carried out by the cam after step S10 treatment.
2. a kind of 20Cr cam cuttings technique according to claim 1, it is characterised in that:The temper is returned for low temperature Fire treatment, the temperature is 180 DEG C~200 DEG C, is incubated 3 hours~4 hours.
3. a kind of 20Cr cam cuttings technique according to claim 1, it is characterised in that:Grinding ginseng during the fine grinding cam Number is cubic boron nitride for emery wheel abrasive material, and linear velocity 60m/s~80m/s, radial feeds 0.003mm/r~0.007mm/r are cold But liquid is Aquatex3380.
CN201611268044.8A 2016-12-31 2016-12-31 A kind of 20Cr cam cuttings technique Pending CN106736321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611268044.8A CN106736321A (en) 2016-12-31 2016-12-31 A kind of 20Cr cam cuttings technique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611268044.8A CN106736321A (en) 2016-12-31 2016-12-31 A kind of 20Cr cam cuttings technique

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Publication Number Publication Date
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108927581A (en) * 2018-08-06 2018-12-04 合肥银泉铸造有限责任公司 A kind of entirety worm screw processing technology
CN109483186A (en) * 2018-12-24 2019-03-19 王明川 A kind of processing technology improving plane dish-type cam cutting precision and efficiency
CN109837377A (en) * 2017-11-29 2019-06-04 江苏科技大学 The method for preventing cam of camshaft delayed crack
CN111283389A (en) * 2020-03-17 2020-06-16 无锡鹰贝精密轴承有限公司 End face grinding process for wear-resisting disc of hydraulic motor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101249602A (en) * 2008-03-21 2008-08-27 谢斌 Processing technique of cam bit
CN102962650A (en) * 2012-12-16 2013-03-13 重庆望江工业有限公司 Method for manufacturing prismatic profiling facing cam
CN103433709A (en) * 2013-08-28 2013-12-11 宁波富莱茵汽车部件有限公司 Processing technology of camshaft
WO2014195098A1 (en) * 2013-06-03 2014-12-11 Mahle International Gmbh Method for producing a cam
CN104233315A (en) * 2013-06-14 2014-12-24 无锡市森信精密机械厂 Technology for preventing grinding crack of carburizing camshaft
CN104259756A (en) * 2014-08-15 2015-01-07 安庆创跃电器有限公司 Reciprocating cutter bar mower cam machining process
CN105563055A (en) * 2015-11-27 2016-05-11 陕西启源科技发展有限责任公司 Thin-walled workpiece machining method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101249602A (en) * 2008-03-21 2008-08-27 谢斌 Processing technique of cam bit
CN102962650A (en) * 2012-12-16 2013-03-13 重庆望江工业有限公司 Method for manufacturing prismatic profiling facing cam
WO2014195098A1 (en) * 2013-06-03 2014-12-11 Mahle International Gmbh Method for producing a cam
CN104233315A (en) * 2013-06-14 2014-12-24 无锡市森信精密机械厂 Technology for preventing grinding crack of carburizing camshaft
CN103433709A (en) * 2013-08-28 2013-12-11 宁波富莱茵汽车部件有限公司 Processing technology of camshaft
CN104259756A (en) * 2014-08-15 2015-01-07 安庆创跃电器有限公司 Reciprocating cutter bar mower cam machining process
CN105563055A (en) * 2015-11-27 2016-05-11 陕西启源科技发展有限责任公司 Thin-walled workpiece machining method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109837377A (en) * 2017-11-29 2019-06-04 江苏科技大学 The method for preventing cam of camshaft delayed crack
CN108927581A (en) * 2018-08-06 2018-12-04 合肥银泉铸造有限责任公司 A kind of entirety worm screw processing technology
CN109483186A (en) * 2018-12-24 2019-03-19 王明川 A kind of processing technology improving plane dish-type cam cutting precision and efficiency
CN111283389A (en) * 2020-03-17 2020-06-16 无锡鹰贝精密轴承有限公司 End face grinding process for wear-resisting disc of hydraulic motor
CN111283389B (en) * 2020-03-17 2021-10-22 无锡鹰贝精密液压有限公司 End face grinding process for wear-resisting disc of hydraulic motor

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