CN116214102A - High-hardness mandrel machining process - Google Patents
High-hardness mandrel machining process Download PDFInfo
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- CN116214102A CN116214102A CN202310333216.9A CN202310333216A CN116214102A CN 116214102 A CN116214102 A CN 116214102A CN 202310333216 A CN202310333216 A CN 202310333216A CN 116214102 A CN116214102 A CN 116214102A
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- mandrel
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention relates to the technical field of manufacturing processes, and provides a high-hardness mandrel processing process, which comprises the following steps of: s1, straightening a blank for the first time to ensure that the straightness is less than or equal to 0.2; s2, rough turning the blank to enable the blank to reach the design drawing standard; s3, carrying out tempering heat treatment on the rough-turned blank to HRC38-42; s4, straightening the blank for the second time to ensure that the straightness is less than or equal to 0.2; s5, grinding the blank, and grinding the blank to form a mandrel, wherein the bilateral allowance of the outer circle of the mandrel is 0.35-0.45; s6, straightening the blank for the third time to ensure that the straightness is less than or equal to 0.2; s7, roughly and finely rolling the spline A on the mandrel to enable the spline A to reach the design drawing standard; s8, carrying out laser quenching on the outer surface of the spline A to ensure that the tooth surface hardness of the spline A is HRC45-50, the quenching depth is 0.6-1mm, and the tooth surface deformation is controlled within 0.1 in the tooth surface length direction; s9, carrying out laser quenching on the outer circle surface of the mandrel to ensure that the surface hardness of the mandrel is HRC50-55 and the quenching depth is 1.2-1.5mm; s10, cooling the mandrel.
Description
Technical Field
The invention relates to the technical field of manufacturing processes, in particular to a high-hardness mandrel processing process.
Background
The mandrel is used in various fields, such as automobile parts, office automation parts, household electrical appliance parts, electric tool parts and the like. The mandrel is a mechanical part, typically a metal round bar, that supports and rotates with the rotating part to transmit motion, torque, or bending moment, and the segments may have different diameters. The part in the machine that is in rotary motion is mounted on the spindle.
The mandrel is used as a transmission part and needs to have certain hardness so as to avoid the conditions of fracture and the like. Existing mandrels are typically treated with electroplated hard chrome on the surface to increase the surface hardness and wear resistance of the mandrel. However, the following disadvantages exist in the way of electroplating hard chromium: 1. high cost and the need to continue processing multiple times after plating. 2. The hardness effect is generally small, and the thickness of the hard chromium coating is generally only about 0.05-0.15 mm.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-hardness mandrel processing technology which can greatly improve the surface hardness and wear resistance of the mandrel and has lower cost.
The invention provides a high-hardness mandrel processing technology, which comprises the following steps of:
s1, straightening a blank for the first time to ensure that the straightness is less than or equal to 0.2;
s2, roughly turning the blank to enable the blank to reach the design drawing standard;
s3, carrying out quenching and tempering heat treatment on the blank after rough turning to HRC38-42;
s4, straightening the blank for the second time to ensure that the straightness is less than or equal to 0.2;
s5, grinding the blank, and grinding the blank to form a mandrel, wherein the bilateral allowance of the outer circle of the mandrel is 0.35-0.45;
s6, straightening the blank for the third time to ensure that the straightness is less than or equal to 0.2;
s7, roughly and finely rolling the spline A on the mandrel to enable the spline A to reach the design drawing standard;
s8, carrying out laser quenching on the outer surface of the spline A to ensure that the tooth surface hardness of the spline A is HRC45-50, the quenching depth is 0.6-1mm, and the tooth surface deformation is controlled within 0.1 in the length direction of the tooth surface;
s9, carrying out laser quenching on the outer circle surface of the mandrel to ensure that the surface hardness of the mandrel is HRC50-55 and the quenching depth is 1.2-1.5mm;
s10, cooling the mandrel.
Further, before the blank is straightened for the second time, ultrasonic flaw detection is carried out on the blank, and a blank without cracks and qualified is selected to enter the next working procedure.
Further, after the blank is straightened for the second time, a test piece with the length of 50mm is sawed at the two ends of the blank, metallographic analysis is carried out on the test piece, and hardness data, model data and specification data of the test piece are archived.
Further, S11 is included, the excircle of the mandrel is finely turned, so that the upper deviation is 0mm, and the lower deviation is 0.063mm.
Further, S12, deburring and dulling are sequentially carried out on the surface of the mandrel.
Further, the method also comprises S13, carrying out fourth straightening on the blank to ensure that the straightness is less than or equal to 0.2 and the jumping is less than or equal to
Further, no bruising of the outer circumference of the mandrel is allowed after step S5.
The beneficial effects are that: according to the high-hardness mandrel processing technology provided by the invention, the allowance of the blank on the outer circle and the double edge of the mandrel is 0.35-0.45 before the blank is ground into the mandrel, and then the surface of the spline A and the surface of the mandrel are subjected to laser quenching treatment successively. After surface laser quenching, the energy required by the surface layer is about 40J/mm < 2 >, and the hardness is obviously improved; the surface layer is refined grains, so that the wear resistance of the mandrel is improved; the hardness of the surface layer is high, and the hardness of the transition zone is reduced, so that the bearing surface of the mandrel has higher wear resistance and impact resistance, and the service life is prolonged by about one time, and the cost is high. And meanwhile, compared with the hard chromium electroplating treatment, the laser quenching has lower cost.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1, the invention provides a high-hardness mandrel processing technology, which comprises the following steps:
s1, blanking according to the size of the blank, and straightening the blank for the first time to ensure that the straightness is less than or equal to 0.2.
S2, rough turning the blank to enable the blank to reach the design drawing standard.
S3, carrying out tempering heat treatment on the rough-turned blank to HRC38-42.
S4, straightening the blank for the second time to ensure that the straightness is less than or equal to 0.2.
S5, grinding the blank, and grinding the blank to form a mandrel, wherein the outer circle size of the mandrel is
The double-side allowance of the outer circle of the mandrel is 0.35-0.45, and the double-side allowance of the mandrel is used for machining after quenching.
S6, straightening the blank for the third time to ensure that the straightness is less than or equal to 0.2.
S7, roughly and finely rolling the spline A on the mandrel to enable the spline A to reach the design drawing standard (the spline A is required to be firstly tested and rolled to be qualified and then processed).
S8, carrying out laser quenching on the outer surface of the spline A to ensure that the tooth surface hardness of the spline A is HRC45-50, the quenching depth is 0.6-1mm, the tooth surface deformation is controlled within 0.1 in the tooth surface length direction, and carrying out passing inspection by using a standard gauge.
S9, carrying out laser quenching on the outer circle surface of the mandrel to ensure that the surface hardness of the mandrel is HRC50-55 and the quenching depth is 1.2-1.5mm;
s10, cooling the mandrel. And (3) checking whether the size of the mandrel meets the design requirement or not and whether the appearance is good or not (rust, bruise, burr, scrap iron and the like are avoided in appearance) between shipment. And then carrying out detail treatment, cleaning and oiling, winding oil paper, sleeving a silk screen, and filling into a wooden box to prevent bruising.
The process comprises the steps of grinding a blank into a mandrel, carrying out laser quenching treatment on the surface of a spline A and the surface of the mandrel in sequence, wherein the double-side allowance of the outer circle of the mandrel is 0.35-0.45.
The laser quenching has the advantages that: 1. the laser surface quenching, the energy required by the surface layer of the mandrel is about 40J/mm < 2 >, and the hardness is obviously improved. 2. After surface laser quenching, the surface layer of the mandrel is refined grains, so that the wear resistance of the mandrel is improved. 3. After laser quenching of the surface of the mandrel, the hardness of the surface layer is high, and the hardness of the transition zone is reduced, so that the bearing surface of the mandrel has higher wear resistance and impact resistance, and the service life of the mandrel is doubled.
In addition, compared with the traditional hard chromium electroplating treatment, the laser quenching used in the process has lower cost.
In one embodiment, the blank is subjected to ultrasonic flaw detection before being subjected to the second straightening, and the blank which is free of cracks and qualified is selected to enter the next working procedure. And the qualified blank makes a first-closing record and a file to facilitate subsequent inquiry.
In one embodiment, after the blank is straightened for the second time, a test piece with the length of 50mm is sawed at the two ends of the blank, metallographic analysis is carried out on the test piece, and hardness data, model data and specification data of the test piece are archived so as to facilitate subsequent inquiry.
In one embodiment, the method further comprises S11, finely turning the outer circle of the mandrel to enable the upper deviation to be 0mm and the lower deviation to be 0.063mm, so that the size of the mandrel meets the design use requirement.
In one embodiment, the method further comprises S12, deburring and dulling are sequentially carried out on the surface of the mandrel, so that the surface smoothness of the mandrel is improved, and the method is convenient to install and use.
In one embodiment, the method further comprises S13, carrying out fourth straightening on the blank to ensure that the straightness is less than or equal to 0.2 and the jumping is less than or equal to
In one embodiment, no bruising of the outer circumference of the mandrel is allowed after step S5.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. A processing technology of a high-hardness mandrel is characterized in that: the method comprises the following steps:
s1, straightening a blank for the first time to ensure that the straightness is less than or equal to 0.2;
s2, roughly turning the blank to enable the blank to reach the design drawing standard;
s3, carrying out quenching and tempering heat treatment on the blank after rough turning to HRC38-42;
s4, straightening the blank for the second time to ensure that the straightness is less than or equal to 0.2;
s5, grinding the blank, and grinding the blank to form a mandrel, wherein the bilateral allowance of the outer circle of the mandrel is 0.35-0.45;
s6, straightening the blank for the third time to ensure that the straightness is less than or equal to 0.2;
s7, roughly and finely rolling the spline A on the mandrel to enable the spline A to reach the design drawing standard;
s8, carrying out laser quenching on the outer surface of the spline A to ensure that the tooth surface hardness of the spline A is HRC45-50, the quenching depth is 0.6-1mm, and the tooth surface deformation is controlled within 0.1 in the length direction of the tooth surface;
s9, carrying out laser quenching on the outer circle surface of the mandrel to ensure that the surface hardness of the mandrel is HRC50-55 and the quenching depth is 1.2-1.5mm;
s10, cooling the mandrel.
2. The high hardness mandrel processing process as claimed in claim 1, wherein: before the blank is straightened for the second time, ultrasonic flaw detection is carried out on the blank, and the blank which is free of cracks and qualified is selected to enter the next working procedure.
3. A high hardness mandrel process as claimed in claim 2, wherein: after the blank is straightened for the second time, a test piece with the length of 50mm is sawed at the two ends of the blank, metallographic analysis is carried out on the test piece, and hardness data, model data and specification data of the test piece are archived.
4. The high hardness mandrel processing process as claimed in claim 1, wherein: s11, finely turning the outer circle of the mandrel to enable the upper deviation to be 0mm and the lower deviation to be 0.063mm.
5. The high hardness mandrel processing process as claimed in claim 1, wherein: and S12, deburring and dulling the surface of the mandrel sequentially.
6. The high hardness mandrel processing process as claimed in claim 1, wherein: s13, straightening the blank for the fourth time to ensure that the straightness is less than or equal to 0.2,
7. the high hardness mandrel processing process as claimed in claim 1, wherein: no bruising of the outer circumference of the mandrel is allowed after step S5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310333216.9A CN116214102A (en) | 2023-03-31 | 2023-03-31 | High-hardness mandrel machining process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310333216.9A CN116214102A (en) | 2023-03-31 | 2023-03-31 | High-hardness mandrel machining process |
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| Publication Number | Publication Date |
|---|---|
| CN116214102A true CN116214102A (en) | 2023-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310333216.9A Pending CN116214102A (en) | 2023-03-31 | 2023-03-31 | High-hardness mandrel machining process |
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| CN (1) | CN116214102A (en) |
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- 2023-03-31 CN CN202310333216.9A patent/CN116214102A/en active Pending
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