CN117324894A - Processing method of driven plate for hydraulic torque converter matched with CVT (continuously variable transmission) - Google Patents
Processing method of driven plate for hydraulic torque converter matched with CVT (continuously variable transmission) Download PDFInfo
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- CN117324894A CN117324894A CN202311202338.0A CN202311202338A CN117324894A CN 117324894 A CN117324894 A CN 117324894A CN 202311202338 A CN202311202338 A CN 202311202338A CN 117324894 A CN117324894 A CN 117324894A
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- driven plate
- machining
- torque converter
- inner hole
- heat treatment
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 18
- 238000003672 processing method Methods 0.000 title claims abstract description 15
- 238000003754 machining Methods 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 18
- 238000000641 cold extrusion Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 22
- 239000000047 product Substances 0.000 claims description 20
- 238000012545 processing Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000012797 qualification Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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
Abstract
The invention discloses a processing method of a driven plate for a hydraulic torque converter matched with a CVT (continuously variable transmission), which is used for solving the technical problems that the prior processing method of the driven plate is easy to cause the deformation of an inner hole of the driven plate, unstable in size, out of tolerance of parts, low in qualification rate and the like. The processing method comprises the steps of stamping, rough machining, finish machining, cold extrusion and heat treatment of a sheet metal part, wherein in the finish machining process, an inner hole is machined into a conical structure, and then the inner hole is subjected to cold extrusion and heat treatment to obtain the finished driven plate product meeting the requirements.
Description
Technical Field
The invention relates to a processing method of a driven plate, in particular to a processing method of a driven plate for a hydraulic torque converter matched with a CVT (continuously variable transmission).
Background
The hydraulic torque converter is applied to the transmission and is mounted on the minicar, and the sliding grinding working condition of the hydraulic torque converter applied to the CVT transmission is higher in use frequency and more frequent in switching compared with the sliding grinding working condition applied to the AT transmission. The driven plate used in the hydraulic torque converter is a main working piece in the slip grinding working condition and is also a key part of the locking vibration reduction clutch.
The existing processing method generally strengthens the wear resistance and strength of the driven plate by heat treatment, but because the inner hole of the driven plate is a sealed connection position, the precision requirement is higher, and the deformation control difficulty is higher when the driven plate is subjected to heat treatment, the phenomena of deformation, unstable size, out-of-tolerance parts, low qualification rate and the like are easy to occur.
Disclosure of Invention
The invention aims to provide a processing method of a driven plate for a hydraulic torque converter matched with a CVT (continuously variable transmission), which is used for solving the technical problems that the inner hole of the driven plate is deformed, the size is unstable, the parts are out of tolerance, the qualification rate is low and the like easily caused by adopting the existing processing method of the driven plate.
The design concept of the invention is as follows: the sheet metal part used for processing the driven plate is thinner in wall thickness, and is subjected to larger residual stress after stamping, stress is released at high temperature after heat treatment, the sheet metal part is larger in deformation, the wall thickness of the end face of one end far away from the hub is thinner during inner hole installation, and deformation easily occurs after heat treatment and exceeds the precision required by the work of the sheet metal part. According to the special structure and size requirements of the inner hole machining, the precision of the structural design of the inner hole machined with high precision requirements is guaranteed, and then the deformation is controllable by changing the heat treatment implementation parameters of temperature and time, so that the indexes such as metallographic indexes, hardness indexes, form and position tolerances and sizes of products meet the technical requirements, the qualification rate of parts is finally improved, and the problem of poor quality is successfully solved.
In order to achieve the above purpose, the invention provides a processing method of a driven plate for a hydraulic torque converter matched with a CVT transmission, which is characterized by comprising the following steps:
sheet metal part stamping
Preparing a sheet metal part, stamping the outer contour of the sheet metal part into a driven plate blank according to the size and structure requirements of the driven plate, and reserving machining allowance of 0.3-0.5 mm;
2 coarse processing
2.1, carrying out rough machining on the outer contour of the blank of the driven plate, and reserving machining allowance of 0.05-0.15 mm;
2.2, processing an inner hole at a position corresponding to the blank according to the position and the size setting of the inner hole, and reserving a machining allowance of 0.05-0.15 mm;
3 finish machining
3.1, carrying out finish machining on the outer contour of the rough machined driven plate blank, and removing the allowance;
3.2, finishing the inner hole into a conical structure by taking the inner end surface of one end of the inner hole as a starting point, and reserving a machining allowance of 0.02-0.05 mm;
4 Cold extrusion
Performing cold extrusion on the inner hole after finish machining, removing all the allowance, and improving the roughness of the inner hole to obtain a driven plate semi-finished product;
5 heat treatment
And performing heat treatment on the semi-finished driven plate to obtain a finished driven plate for the hydraulic torque converter matched with the CVT.
Further, the step 5 specifically comprises: and (3) treating the semi-finished driven plate by adopting a nitrocarburizing heat treatment process, so as to obtain the finished driven plate for the hydraulic torque converter matched with the CVT. The temperature setting interval of the nitrocarburizing heat treatment process is smaller, the deformation controllability corresponding to the heat treated product is high, and the stability is good.
Further, the method also comprises the step 6 of checking:
6.1, checking the outer contour and the shape surface size of the driven plate finished product by adopting three-coordinate detection equipment;
6.2, measuring the inner aperture of the driven plate finished product by adopting an inner diameter measuring instrument;
and 6.3, decomposing partial entity of the finished product of the driven plate by a metallographic cutting machine to prepare a sample by an insert, detecting metallographic structure by a metallographic microscope, and detecting hardness by a hardness tester.
In step 3.2, the end face far away from one end of the hub is heated to a large extent during inner hole installation, and the inner end face near one end of the hub is used as a starting point during inner hole installation, the inner hole is processed into a conical structure by a numerical control vehicle, and the large end of the conical structure is far away from the hub.
Further, the taper of the conical structure is 0.05-0.5 degrees.
Further, in step 2.2, the diamond tool bit is adopted to process an inner hole at the position corresponding to the blank, so that the processing precision of the inner hole is ensured.
Further, in step 1 ], the sheet metal part is made of automobile high-strength steel SAPH440, and the sheet metal part is high in mechanical strength and good in stamping ductility.
Further, in the step 5, the temperature of the heat treatment is 500-560 ℃ and the time is 6-8h, and the deformation of the product can be better controlled within the temperature range.
Further, in step 5, after the heat treatment, the hardness of the finished driven plate is set to be HV500 to HV620.
Compared with the prior art, the invention has the following advantages:
1. the processing method comprises the steps of stamping, rough machining, finish machining, cold extrusion and heat treatment of a sheet metal part, wherein in the finish machining process, an inner hole is machined into a conical structure, and then the driven plate finished product meeting the requirements is finally obtained through the cold extrusion and heat treatment process.
2. The heat treatment process adopts a nitrocarburizing heat treatment process, can ensure the optimization of the integral hardness and mechanical property of the driven plate product, simultaneously furthest reduces the deformation of the heat treatment, combines the taper design of the inner hole in the processing process, and finally ensures that the driven plate meets the hardness and the size required by the work of the driven plate.
Drawings
Fig. 1 is a schematic view of a structure of a driven plate manufactured by using the embodiment of the invention.
Fig. 2 is an enlarged view of the taper of the bore of fig. 1.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings and specific implementation.
Referring to fig. 1, the invention provides a processing method of a driven plate for a torque converter matched with a CVT transmission, comprising the following steps:
step 1) stamping sheet metal parts
Preparing a sheet metal part, stamping the outer contour of the sheet metal part into a blank according to the size and structural requirements of a driven plate, and reserving machining allowance of 0.3-0.5mm, wherein the sheet metal part is made of automobile high-strength steel SAPH440.
Step 2) coarse processing
2.1, machining the outer contour of the blank, ensuring that the dimensional tolerance and the roughness of the blank meet the design requirements, and reserving a machining allowance of 0.05-0.15 mm. Wherein roughness is generally detected by water-blown sand after machining.
2.2, machining an inner hole at a position corresponding to the blank according to the position and the size setting of the inner hole, and generally improving the machining precision through a diamond cutter head, ensuring that the dimensional tolerance and the roughness meet the requirements, and reserving a machining allowance of 0.05-0.15 mm.
Step 3) finishing
3.1, carrying out finish machining on the outer contour of the rough machined blank, and removing the allowance;
3.2, the inner end surface close to one end of the hub is used as a starting point when the inner hole is installed, the inner hole is finely machined into a conical structure through a numerical control vehicle, the large end of the conical structure is far away from the hub (the large end is greatly deformed by heat), and machining allowance of 0.02-0.05mm is reserved.
As shown in FIG. 2, in this embodiment, the taper of the taper structure is generally 0.05-0.5 °, that is, the diameter of one end of the inner hole in FIG. 2 is phi 01, the diameter of the other end is phi 02, and phi 02 is slightly larger than phi 01, so that the inner hole is ensured to be a taper structure, and in the processing process of the inner hole of the driven plate with other dimensions, the taper can also be set in a matching manner according to the design of actual processing requirements.
Step 4) Cold extrusion
And (3) performing cold extrusion on the inner hole after finish machining, and removing all the allowance to obtain a semi-finished product of the driven plate.
Step 5 heat treatment
And performing heat treatment on the semi-finished driven plate by adopting a nitrocarburizing heat treatment process, and controlling the temperature (500-560 ℃) and time (6-8 hours) of the heat treatment to ensure that the large end of the inner hole conical structure is heated and deformed to a designed size, thereby obtaining the finished driven plate (shown in a final finished product structure diagram in figure 1) for the hydraulic torque converter matched with the CVT.
In the embodiment, the nitrocarburizing heat treatment process is selected for heat treatment deformation, and compared with the common heat treatment process, the mode has high controllability on deformation and better stability of the finished product after treatment.
Step 6, checking
And 6.1, checking the outer contour and the shape surface size of the finished driven plate by adopting three-coordinate detection equipment.
And 6.2, measuring the inner aperture of the finished driven plate by adopting an inner diameter measuring instrument.
And 6.3, decomposing partial entity of the finished product of the driven plate by a metallographic cutting machine to prepare a sample by an insert, detecting metallographic structure by a metallographic microscope, and detecting hardness by a hardness tester. The final detection shows that the hardness of the finished driven plate obtained after the treatment by the method is HV 500-HV 620, and meets the actual use requirement.
In addition, the invention detects the product according to the precision requirement of the product in the processing process, and if the parameters of the detected piece obtained in a certain step do not meet the requirements, the product is comprehensively considered according to the actual situation and then is released or scrapped, so that the quality of the finally obtained finished product meets the requirements.
The qualification rate of the finished product of the driven plate obtained based on the processing method is close to 100%, and the qualification rate is greatly improved compared with that of the driven plate processed by the traditional method. Through field verification, the driven plate processed by the invention has good matching effect with peripheral parts (such as a cover wheel shell, a hub and the like) and high practicability.
The invention is suitable for the processing technology of the driven plate with high requirement on deformation control and strict dimensional tolerance. By specific control of the structure and the size of the inner hole, deformation compensation is performed, deformation is guaranteed to be within a control range after heat treatment, the design index requirement is met, and the problem that the technical requirement of parts is exceeded after heat treatment deformation in the prior art is solved.
Claims (9)
1. The processing method of the driven plate for the hydraulic torque converter matched with the CVT transmission is characterized by comprising the following steps of:
sheet metal part stamping
Preparing a sheet metal part, stamping the outer contour of the sheet metal part into a driven plate blank according to the size and structure requirements of the driven plate, and reserving machining allowance of 0.3-0.5 mm;
2 coarse processing
2.1, carrying out rough machining on the outer contour of the blank of the driven plate, and reserving machining allowance of 0.05-0.15 mm;
2.2, processing an inner hole at a position corresponding to the blank according to the position and the size setting of the inner hole, and reserving a machining allowance of 0.05-0.15 mm;
3 finish machining
3.1, carrying out finish machining on the outer contour of the rough machined driven plate blank, and removing the allowance;
3.2, finishing the inner hole into a conical structure by taking the inner end surface of one end of the inner hole as a starting point, and reserving a machining allowance of 0.02-0.05 mm;
4 Cold extrusion
Cold extrusion is carried out on the inner hole after finish machining, and all the allowance is removed, so that a driven plate semi-finished product is obtained;
5 heat treatment
And performing heat treatment on the semi-finished driven plate to obtain a finished driven plate for the hydraulic torque converter matched with the CVT.
2. The method of claim 1, wherein step 5 is specifically:
and (3) treating the semi-finished driven plate by adopting a nitrocarburizing heat treatment process, so as to obtain the finished driven plate for the hydraulic torque converter matched with the CVT.
3. The method of manufacturing a driven plate for a torque converter for a CVT transmission according to claim 2, further comprising the step of 6:
6.1, checking the outer contour and the shape surface size of the driven plate finished product by adopting three-coordinate detection equipment;
6.2, measuring the inner aperture of the driven plate finished product by adopting an inner diameter measuring instrument;
and 6.3, decomposing partial entity of the finished product of the driven plate by a metallographic cutting machine to prepare a sample by an insert, detecting metallographic structure by a metallographic microscope, and detecting hardness by a hardness tester.
4. A method of manufacturing a driven plate for a torque converter for a CVT transmission according to claim 3, characterized by:
in step 3.2, the inner end surface, which is close to one end of the hub when the inner hole is installed, is used as a starting point, the inner hole is processed into a conical structure by a numerical control vehicle, and the large end of the conical structure is far away from the hub.
5. The method for machining the driven plate for the torque converter for the CVT transmission according to claim 4, wherein:
the taper of the conical structure is 0.05-0.5 degrees.
6. The method for machining the driven plate for the torque converter for the CVT transmission according to claim 5, wherein:
in step 2.2, machining an inner hole at a position corresponding to the blank by adopting a diamond tool bit.
7. The method for machining the driven plate for the torque converter for the CVT transmission according to claim 6, wherein:
in step 1, the sheet metal part is made of automobile high-strength steel SAPH440.
8. The method for machining the driven plate for the torque converter for the CVT transmission according to claim 2, characterized in that:
in the step 5, the temperature of the heat treatment is 500-560 ℃ and the time is 6-8h.
9. The method for machining the driven plate for the torque converter for the CVT transmission according to claim 8, wherein:
in the step 5, after heat treatment, the hardness of the finished driven plate product is made to be HV 500-HV 620.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311202338.0A CN117324894A (en) | 2023-09-18 | 2023-09-18 | Processing method of driven plate for hydraulic torque converter matched with CVT (continuously variable transmission) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311202338.0A CN117324894A (en) | 2023-09-18 | 2023-09-18 | Processing method of driven plate for hydraulic torque converter matched with CVT (continuously variable transmission) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117324894A true CN117324894A (en) | 2024-01-02 |
Family
ID=89289387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311202338.0A Pending CN117324894A (en) | 2023-09-18 | 2023-09-18 | Processing method of driven plate for hydraulic torque converter matched with CVT (continuously variable transmission) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117324894A (en) |
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2023
- 2023-09-18 CN CN202311202338.0A patent/CN117324894A/en active Pending
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