CN117102830A - Thin cam processing technology - Google Patents
Thin cam processing technology Download PDFInfo
- Publication number
- CN117102830A CN117102830A CN202311140347.1A CN202311140347A CN117102830A CN 117102830 A CN117102830 A CN 117102830A CN 202311140347 A CN202311140347 A CN 202311140347A CN 117102830 A CN117102830 A CN 117102830A
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- China
- Prior art keywords
- blank
- heat treatment
- cam
- thin
- quenching
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- 238000005516 engineering process Methods 0.000 title claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000010791 quenching Methods 0.000 claims abstract description 16
- 230000000171 quenching effect Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005242 forging Methods 0.000 claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- 238000003754 machining Methods 0.000 claims abstract description 4
- 238000009966 trimming Methods 0.000 claims abstract description 4
- 238000004321 preservation Methods 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
The invention provides a thin cam processing technology, which solves the problems of poor wear resistance and poor precision of the existing thin cam. The method comprises the following steps: blanking, forging, primary heat treatment, rough machining, secondary heat treatment, semi-finishing, tertiary heat treatment, plane grinding, linear cutting, finishing, trimming and chamfering, checking and warehousing. The 40GrMo has higher strength and toughness, the deformation of the blank after quenching is smaller, and the blank is refined into grains after forging, so that the fatigue resistance, plasticity, toughness and other mechanical properties of the blank are improved, then the blank is subjected to the first heat treatment to refine the grains, uniform structure and eliminate internal stress, and after the second heat treatment and the third heat treatment, the hardness of the blank is increased, the wear resistance is improved, and the blank is not easy to deform in the processing process, so that the processing precision of the cam is ensured, and the service life and reliability of the cam are further improved.
Description
Technical Field
The invention relates to the technical field of cam processing, in particular to a thin cam processing technology.
Background
The combing machine is a machine used for realizing the combing process in the spinning process, a top combing mechanism is arranged in the combing machine, the top combing mechanism is favorable for reducing combed sliver neps and short piles, the straightening degree of fibers is improved, the evenness value of combed sliver is improved, a top comb in the top combing mechanism is arranged on a nipper through a bracket and swings along with the nipper, and the nipper is driven by a cam; the whole mechanism of the combing machine is compact, and the cam can only adopt a thin cam (as shown in figure 1) due to the limit of the installation space, and the traditional thin cam has poor wear resistance and precision and short service life.
Disclosure of Invention
In order to overcome the defects of the background technology, the invention provides a thin cam processing technology, which solves the problems of poor wear resistance and poor precision of the existing thin cam.
The technical scheme adopted by the invention is as follows:
a thin cam processing technique, comprising the following steps:
(1) And (3) blanking: the blank is 40GrMo;
(2) Forging: the blank is subjected to free forging;
(3) First heat treatment: normalizing, heating to 850-900 ℃, and then air cooling;
(4) Rough machining: the outer diameter of the blank is set to be 4-6mm, and the blank is axially set to be 4-6 mm;
(5) And (3) performing secondary heat treatment: modulating the blank, wherein the hardness of the blank is RHC 28-32;
(6) Semi-finishing: the outer diameter of the blank is left with a margin of 0.4-0.6mm, the axial margin of 0.4-0.6mm is left, and the blank is pre-drilled through a drilling jig;
(7) Third heat treatment: the HRC of the blank is greater than 60;
(8) And (3) plane grinding: the flatness of the blank is 0.005-0.015, and the parallelism of the two surfaces is 0.01-0.03;
(9) Wire cutting: performing linear cutting on the shape and the inner hole of the blank, and placing the allowance of 0.1-0.3mm on the shape and the inner hole to form a cam;
(10) And (3) finishing: finely grinding the inner hole of the cam, positioning the inner hole of the cam, and processing the shape of the cam by a numerical control processing center;
(11) Trimming and chamfering;
(12) And (5) checking and warehousing.
And (3) performing heat treatment in the second part of the step (5), wherein the quenching temperature is 800-850 ℃, the tempering temperature is 200-300 ℃, and the heat preservation time is 1.5-2.5 hours.
And (3) performing heat treatment in the second part of the step (5), wherein the quenching temperature is 830 ℃, the tempering temperature is 250 ℃, and the heat preservation time is 2 hours.
And (3) carrying out heat treatment in the third part of the step (7), adopting vacuum quenching, preheating for 25 minutes at 800 ℃, and carrying out quenching heat preservation for 20 minutes.
The beneficial effects of the invention are as follows:
the 40GrMo has higher strength and toughness, the deformation of the blank after quenching is smaller, and the blank is refined into grains after forging, so that the fatigue resistance, plasticity, toughness and other mechanical properties of the blank are improved, then the blank is subjected to the first heat treatment to refine the grains, uniform structure and eliminate internal stress, and after the second heat treatment and the third heat treatment, the hardness of the blank is increased, the wear resistance is improved, and the blank is not easy to deform in the processing process, so that the processing precision of the cam is ensured, and the service life and reliability of the cam are further improved.
Drawings
Fig. 1 is a schematic view of a thin cam.
Fig. 2 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in an embodiment, as shown in fig. 2, a thin cam processing process includes the steps of:
(1) And (3) blanking: the blank is 40GrMo;
(2) Forging: the blank is subjected to free forging;
(3) First heat treatment: normalizing, heating to 850-900 ℃, and then air cooling;
(4) Rough machining: the outer diameter of the blank is placed with a allowance of 5mm, and the allowance of 5mm is placed axially;
(5) And (3) performing secondary heat treatment: modulating the blank, wherein the hardness of the blank is RHC 28-32;
(6) semi-finishing, namely, reserving a margin of 0.4-0.6mm on the outer diameter of the blank, reserving a margin of 0.4-0.6mm on the axial direction, and pre-drilling the blank through a drilling jig;
(7) Third heat treatment: the HRC of the blank is greater than 60;
(8) And (3) plane grinding: the flatness of the blank is 0.01, and the parallelism of two surfaces is 0.02;
(9) Wire cutting: performing linear cutting on the appearance and the inner hole of the blank, and placing a margin of 0.2mm on the appearance and the inner hole to form a cam;
(10) And (3) finishing: finely grinding the inner hole of the cam, positioning the inner hole of the cam, and processing the shape of the cam by a numerical control processing center;
(11) Trimming and chamfering;
(12) And (5) checking and warehousing.
The 40GrMo has higher strength and toughness, the deformation of the blank after quenching is smaller, and the blank is refined into grains after forging, so that the fatigue resistance, plasticity, toughness and other mechanical properties of the blank are improved, then the blank is subjected to the first heat treatment to refine the grains, uniform structure and eliminate internal stress, and after the second heat treatment and the third heat treatment, the hardness of the blank is increased, the wear resistance is improved, and the blank is not easy to deform in the processing process, so that the processing precision of the cam is ensured, and the service life and reliability of the cam are further improved.
In the embodiment, the second heat treatment in the step (5) is performed at a quenching temperature of 800-850 ℃, a tempering temperature of 200-300 ℃ and a heat preservation time of 1.5-2.5 hours.
In an embodiment, the second heat treatment in the step (5) is performed at a quenching temperature of 830 ℃, a tempering temperature of 250 ℃ and a heat preservation time of 2 hours.
In the embodiment, the third heat treatment in the step (7) adopts vacuum quenching, preheating for 25 minutes at 800 ℃, and quenching and heat preservation for 20 minutes. The fatigue degree, the plasticity, the toughness and the corrosion resistance of the blank are improved by vacuum quenching, and meanwhile, the residual grease on the surface of the blank is removed.
It is apparent that the above examples of the present invention are merely illustrative of the present invention and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary or impossible to exemplify all embodiments herein. And obvious changes and modifications which come within the spirit of the invention are desired to be protected.
Claims (4)
1. A thin cam processing technology is characterized in that: the method comprises the following steps:
(1) And (3) blanking: the blank is 40GrMo;
(2) Forging: the blank is subjected to free forging;
(3) First heat treatment: normalizing, heating to 850-900 ℃, and then air cooling;
(4) Rough machining: the outer diameter of the blank is set to be 4-6mm, and the blank is axially set to be 4-6 mm;
(5) And (3) performing secondary heat treatment: modulating the blank, wherein the hardness of the blank is RHC 28-32;
(6) Semi-finishing: the outer diameter of the blank is left with a margin of 0.4-0.6mm, the axial margin of 0.4-0.6mm is left, and the blank is pre-drilled through a drilling jig;
(7) Third heat treatment: the HRC of the blank is greater than 60;
(8) And (3) plane grinding: the flatness of the blank is 0.005-0.015, and the parallelism of the two surfaces is 0.01-0.03;
(9) Wire cutting: performing linear cutting on the shape and the inner hole of the blank, and placing the allowance of 0.1-0.3mm on the shape and the inner hole to form a cam;
(10) And (3) finishing: finely grinding the inner hole of the cam, positioning the inner hole of the cam, and processing the shape of the cam by a numerical control processing center;
(11) Trimming and chamfering;
(12) And (5) checking and warehousing.
2. A thin cam process according to claim 1, wherein: and (3) performing heat treatment in the second part of the step (5), wherein the quenching temperature is 800-850 ℃, the tempering temperature is 200-300 ℃, and the heat preservation time is 1.5-2.5 hours.
3. A thin cam process according to claim 2, wherein: and (3) performing heat treatment in the second part of the step (5), wherein the quenching temperature is 830 ℃, the tempering temperature is 250 ℃, and the heat preservation time is 2 hours.
4. A thin cam process according to claim 1, wherein: and (3) carrying out heat treatment in the third part of the step (7), adopting vacuum quenching, preheating for 25 minutes at 800 ℃, and carrying out quenching heat preservation for 20 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311140347.1A CN117102830A (en) | 2023-09-06 | 2023-09-06 | Thin cam processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311140347.1A CN117102830A (en) | 2023-09-06 | 2023-09-06 | Thin cam processing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117102830A true CN117102830A (en) | 2023-11-24 |
Family
ID=88807445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311140347.1A Pending CN117102830A (en) | 2023-09-06 | 2023-09-06 | Thin cam processing technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117102830A (en) |
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2023
- 2023-09-06 CN CN202311140347.1A patent/CN117102830A/en active Pending
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