CN115741505A - Resin fine-grain centerless grinding wheel for polishing piston rod of vehicle shock absorber and preparation method thereof - Google Patents
Resin fine-grain centerless grinding wheel for polishing piston rod of vehicle shock absorber and preparation method thereof Download PDFInfo
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- CN115741505A CN115741505A CN202211548861.4A CN202211548861A CN115741505A CN 115741505 A CN115741505 A CN 115741505A CN 202211548861 A CN202211548861 A CN 202211548861A CN 115741505 A CN115741505 A CN 115741505A
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- piston rod
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- shock absorber
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Abstract
The invention relates to a resin fine-grained centerless grinding wheel for polishing a piston rod of a shock absorber for a vehicle, which is prepared from the following raw materials in percentage by weight: 10 to 15 percent of epoxy resin, 10 to 15 percent of phenolic resin, 0.5 to 5 percent of toughening agent and the balance of white corundum abrasive. Weighing the raw materials according to the weight ratio, and mixing, molding and curing to obtain the resin fine-grained centerless grinding wheel for polishing the piston rod of the shock absorber for the vehicle. The grinding wheel prepared by the invention is applied to the accurate grinding process of the piston rod, the roughness can reach below 0.075 mu m according to different workpiece requirements under the conditions that the diameter of a workpiece is 12-26mm and the grinding quantity is 0.005-0.01mm, the ground surface of the piston rod has no defects of scratches, spiral grains and the like, and the brightness is good.
Description
Technical Field
The invention belongs to the technical field of grinding wheels, and particularly relates to a resin fine-grained centerless grinding wheel for polishing a piston rod of a vehicle shock absorber and a preparation method thereof.
Background
The shock absorber is widely applied to the automobile industry and is used for inhibiting the shock generated when the spring rebounds after absorbing shock and the impact from the road surface. When the shock absorber passes through the uneven road surface, although the shock absorbing spring can filter the shock of the road surface, the spring can still reciprocate, and the shock absorber is used for inhibiting the spring from jumping.
The piston rod is used as an important component part of the automobile shock absorber, and the machining precision and the surface quality of the piston rod determine the quality of the shock absorber. In the machining process of the piston rod of the shock absorber, a grinding wheel is needed to machine the surface of the piston rod of the shock absorber, so that the surface quality of the piston rod of the shock absorber reaches the use standard. The machining of the piston rod of the shock absorber is divided into two procedures of pre-plating and post-plating grinding, wherein the post-plating grinding uses a resin fine-grained grinding wheel to polish so as to meet the requirements of surface quality and precision, and therefore the polishing of the piston rod plays a crucial role in the surface machining precision.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a resin fine-grained centerless grinding wheel for polishing a piston rod of a shock absorber for a vehicle; the grinding wheel has high wear resistance, self-sharpening property and elasticity, has low roughness, no scratch, spiral line and other defects after being used for grinding the piston rod, and has high brightness.
The invention also provides a preparation method of the resin fine-grained centerless grinding wheel for polishing the piston rod of the vehicle shock absorber.
In order to achieve the purpose, the invention is solved by the following technical scheme:
a resin fine-grained centerless grinding wheel for polishing a piston rod of a shock absorber for a vehicle is prepared from the following raw materials in percentage by weight: 10 to 15 percent of epoxy resin, 10 to 15 percent of phenolic resin, 0.5 to 5 percent of toughening agent and the balance of white corundum abrasive.
Specifically, the toughening agent may be polyvinyl butyral or the like.
Further, the weight percentage of the toughening agent is preferably 1% -3%.
Specifically, the white corundum abrasive may have a particle size range of F240 to F600, and more preferably F320 to F500. The proportion of the white corundum abrasive is 70-80%.
The invention also provides a preparation method of the resin fine-grained centerless grinding wheel for polishing the piston rod of the vehicle shock absorber, which comprises the following steps:
1) Weighing the raw materials according to the weight ratio, and uniformly mixing to obtain a mixture; specifically, the following may be used: weighing the white corundum abrasive and the epoxy resin according to the weight ratio, pouring the white corundum abrasive and the epoxy resin into a wheel mill mixer, stirring for 2 to 3 hours, then weighing according to the weight ratio, adding the toughening agent, stirring for 10 to 30 minutes, then adding the phenolic resin weighed according to the weight ratio, and stirring for 10 to 25 minutes to obtain a uniformly mixed mixture;
2) Carrying out material sealing and sieving on the mixture obtained in the step 1) to obtain a molding material; further preferably, it may be: firstly, the mixture is screened by a 16# to 20# screen mesh, and is subjected to material sealing under a sealed condition, and the mixture is placed for 10 to 13h; then, the stuffy mixture is sieved by a 16# to 20# sieve again to obtain a final molding material;
3) And (3) putting the molding material obtained in the step 2) into a mold for cold pressing at room temperature (the pressure is 4-8 MPa), demolding after pressing is finished, air drying at room temperature, and then entering a curing furnace for curing to obtain the material.
In the above preparation method, the curing step in step 3) is specifically: curing at 50-55 ℃ for 1-2 hours, curing at 60-110 ℃ for 11-13 hours, curing at 110-130 ℃ for 4-6 hours, and curing at 130-170 ℃ for 13-16 hours.
In the preparation method, in the step 2), the sieving refers to passing through a 16# to 20# screen.
The grinding wheel is beneficial to grinding in machining of the piston rod of the shock absorber, and can improve machining efficiency and surface quality. Compared with the prior art, the invention has the following beneficial effects:
the binding agent of the resin fine-grain centerless grinding polishing grinding wheel mainly comprises phenolic resin and epoxy resin, plays a role in holding and wetting abrasive materials, and influences the strength, the durability, the self-sharpening performance and other performances of the grinding wheel. The grinding power of the grinding wheel is relatively stable in the grinding process, which indicates that the number of cutting edges participating in grinding is relatively stable, and the grinding wheel has a continuous self-sharpening phenomenon; the trimming interval time can be prolonged by 20-30%; compared with the common product, the elastic modulus is reduced by more than 15 percent and can reach below 5.9MPa, which shows that the elasticity is increased. In the post-plating fine grinding process of the piston rod of the shock absorber, the roughness can reach below 0.075 mu m according to different workpiece requirements under the condition that the grinding amount of a workpiece is 0.005-0.01mm, the ground surface of the piston rod has no defects of scratches, spiral grains and the like, and the brightness is good.
Description of the drawings:
FIG. 1 is a picture of a shock absorber piston rod processed by a grinding wheel prepared in embodiment 2 of the invention;
FIG. 2 is a photograph showing the piston rod of the shock absorber machined by the grinding wheel prepared in comparative example 2.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following examples, but the scope of the present invention is not limited thereto.
In the following examples, all the raw materials were general commercial products which can be directly purchased or prepared according to the conventional techniques in the art. Room temperature refers to 25 ± 5 ℃.
Example 1
A preparation method of a resin fine-grained centerless grinding wheel for polishing a piston rod of a shock absorber for a vehicle comprises the following steps:
1) Weighing a grinding wheel molding material: 400 Kg of white corundum abrasive F, 4.2Kg of white corundum abrasive F, 5.5Kg of epoxy resin, 6.0Kg of phenolic resin and 0.8Kg of polyvinyl butyral;
2) Mixing the grinding wheel molding materials: adding the white corundum abrasive and the epoxy resin into a wheel mill mixer, stirring for 2 hours, then adding the polyvinyl butyral, stirring for 10 minutes, finally adding the phenolic resin, and stirring for 25 minutes to obtain a uniformly mixed mixture; sieving with 16# sieve, sealing, and standing at room temperature for 13 hr; then, the stuffy mixture passes through a No. 16 screen again to obtain a final molding material;
3) And (3) forming of a grinding wheel: putting the molding material into a die with a sizing block, spreading the material, tamping, cold-pressing at room temperature under the pressure of 5MPa, and demolding after pressing;
4) A hardening procedure: after demoulding, the mixture is air-dried for 1 day at room temperature and then transferred into a curing oven for curing, and the curing process comprises the following steps: curing at 50 ℃ for 2 hours, at 80 ℃ for 13 hours, at 130 ℃ for 5 hours and at 160 ℃ for 14 hours.
Example 2
A preparation method of a resin fine-grained centerless grinding wheel for polishing a piston rod of a shock absorber for a vehicle comprises the following steps:
1) Weighing a grinding wheel molding material: 500 Kg of white corundum abrasive F, 5.2Kg of epoxy resin, 5.77Kg of phenolic resin and 0.6Kg of polyvinyl butyral;
2) Mixing the grinding wheel molding materials: adding the white corundum abrasive and the epoxy resin into a wheel mill mixer, stirring for 3 hours, then adding the polyvinyl butyral, stirring for 25 minutes, finally adding the phenolic resin, and stirring for 15 minutes to obtain a uniformly mixed mixture; sieving with 20# sieve, sealing, and standing at room temperature for 10 hr; then, the stuffy mixture is sieved by a 20# sieve again to obtain a final molding material;
3) Forming a grinding wheel: putting the molding material into a die with a sizing block, spreading the molding material, tamping, cold-pressing at room temperature under the pressure of 4.5MPa, and demolding after pressing;
4) A hardening process: after demoulding, the mixture is air-dried for 1 day at room temperature and then transferred into a curing oven for curing, and the curing process comprises the following steps: curing at 50 ℃ for 2 hours, at 80 ℃ for 13 hours, at 130 ℃ for 5 hours and at 160 ℃ for 14 hours.
Comparative example 1
A method for preparing a centerless grinding wheel comprises the following steps:
1) Weighing a grinding wheel molding material: 400 Kg of white corundum abrasive F, 4.2Kg of white corundum abrasive F, 5.5Kg of epoxy resin and 6.0Kg of phenolic resin;
2) Mixing the grinding wheel molding materials: adding the white corundum abrasive and the epoxy resin into a wheel mill mixer, stirring for 2 hours, then adding the phenolic resin, and stirring for 25 minutes to obtain a uniformly mixed mixture; sieving with 16# sieve, sealing, and standing at room temperature for 13 hr; then, the stuffy mixture is sieved by a 16# sieve again to obtain a final molding material;
3) And (3) forming of a grinding wheel: putting the molding material into a die with a sizing block, spreading the molding material, tamping, cold-pressing at room temperature under the pressure of 5MPa, and demolding after pressing;
4) A hardening process: after demoulding, the mixture is air-dried for 1 day at room temperature and then transferred into a curing oven for curing, and the curing process comprises the following steps: curing at 50 ℃ for 2 hours, at 80 ℃ for 13 hours, at 130 ℃ for 5 hours and at 160 ℃ for 14 hours.
Comparative example 2
A method for preparing a centerless grinding wheel comprises the following steps:
1) Weighing a grinding wheel molding material: 500 Kg of white corundum abrasive F, 9.2Kg of epoxy resin, 9.7Kg of phenolic resin and 0.6Kg of polyvinyl butyral;
2) Mixing the grinding wheel molding materials: adding the white corundum abrasive and the epoxy resin into a wheel mill mixer, stirring for 3 hours, then adding the polyvinyl butyral, stirring for 25 minutes, finally adding the phenolic resin, and stirring for 15 minutes to obtain a uniformly mixed mixture; sieving with 20# sieve, sealing, standing at room temperature for 10 hr; then, the stuffy mixture is sieved by a 20# sieve again to obtain a final molding material;
3) And (3) forming of a grinding wheel: putting the molding material into a die with a sizing block, spreading the molding material, tamping, cold-pressing at room temperature under the pressure of 7.8MPa, and demolding after pressing;
4) A hardening procedure: after demoulding, the mixture is air-dried for 1 day at room temperature and then transferred into a curing oven for curing, and the curing process comprises the following steps: curing at 50 ℃ for 2 hours, at 80 ℃ for 13 hours, at 130 ℃ for 5 hours and at 160 ℃ for 14 hours.
Effect verification
The piston rod of the shock absorber is polished by the grinding wheel prepared in the embodiment and the comparative example, the workpiece is made of 45# steel, the surface layer is chromed, the hardness is 55-60HRC, the grinding allowance of the workpiece is 0.005-0.01mm, and the grinding effect is shown in the following table 1 under the condition that the cutting feed amount is 0.007mm each time.
TABLE 1 grinding effect comparison
As can be seen from table 1 above: compared with comparative examples 1 and 2, the grinding wheel has better grinding effect than the comparative examples on the whole; the surface roughness of the processed workpiece is 0.057-0.075 μm, which is superior to the roughness of the comparative example of 0.082-0.093 μm; the number of processed workpieces and the service life of the grinding wheel are also superior to those of a comparative example, and can be improved by 20-30%; and the surface of the processed workpiece has no defects such as scratch, spiral line and the like.
In addition, a picture of the piston rod of the shock absorber machined by the grinding wheel prepared in the embodiment 2 of the invention is shown in fig. 1, and a picture of the piston rod of the shock absorber machined by the grinding wheel prepared in the comparative example 2 is shown in fig. 2. As can be seen from fig. 1 and 2: the surface of the piston rod processed by the grinding wheel has no scratch and no spiral line (the white line on the workpiece on the right side in figure 1 is residual grinding fluid after grinding); however, the piston rod surface processed in comparative example 2 has many scratches and spiral lines (the regular lines in fig. 2 are spiral lines).
In conclusion, the grinding wheel formula system is an organic whole, and corresponding grinding processing effect cannot be achieved beyond the formula system. In the post-plating finish grinding process of the piston rod of the shock absorber, the roughness of the grinding wheel can reach below 0.075 mu m according to different workpiece requirements under the condition that the grinding amount of a workpiece is 0.005-0.01mm, the ground surface of the piston rod has no defects of scratch, spiral line and the like, and the brightness is good.
The above is described for the detailed embodiment process, but not limiting the technical solution of the present invention, and it should be understood by those skilled in the art that any modification, partial replacement and variation can be made on the above embodiment within the scope of the present invention, which should be covered by the claims of the present invention.
Claims (7)
1. A resin fine-grained centerless grinding wheel for polishing a piston rod of a shock absorber for a vehicle is characterized by being prepared from the following raw materials in percentage by weight: 10 to 15 percent of epoxy resin, 10 to 15 percent of phenolic resin, 0.5 to 5 percent of toughening agent and the balance of white corundum abrasive.
2. The resin fine-grained centerless grinding wheel for polishing a piston rod of a shock absorber for a vehicle as claimed in claim 1, wherein the toughening agent is polyvinyl butyral.
3. The resin fine-grained centerless grinding wheel for polishing the piston rod of the shock absorber for the vehicle as claimed in claim 2, wherein the weight percentage of the toughening agent is 1% to 3%.
4. The resin fine-grained centerless grinding wheel for polishing a piston rod of a shock absorber for a vehicle as claimed in claim 1, wherein the grain size of the white corundum abrasive is in the range of F240 to F600.
5. The method for preparing the resin fine-grained centerless grinding wheel for polishing the piston rod of the vehicle shock absorber as claimed in any one of claims 1 to 4, characterized by comprising the steps of:
1) Weighing the raw materials according to the weight ratio, and uniformly mixing to obtain a mixture;
2) Carrying out material sealing and sieving on the mixture obtained in the step 1) to obtain a molding material;
3) And (3) placing the molding material obtained in the step 2) into a mold for cold pressing at room temperature, demolding after pressing is finished, self-drying at room temperature, and then entering a curing furnace for curing to obtain the material.
6. The method for preparing the resin fine-grained centerless grinding wheel for polishing the piston rod of the vehicle shock absorber according to claim 5, wherein in the step 3), the curing process comprises the following steps: curing at 50 to 55 ℃ for 1 to 2 hours, curing at 60 to 110 ℃ for 11 to 13 hours, curing at 110 to 130 ℃ for 4 to 6 hours, and curing at 130 to 170 ℃ for 13 to 16 hours.
7. The preparation method of the resin fine-grained centerless grinding wheel for polishing the piston rod of the vehicle shock absorber as claimed in claim 5, wherein in the step 2), a 16# to 20# screen is screened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211548861.4A CN115741505A (en) | 2022-12-05 | 2022-12-05 | Resin fine-grain centerless grinding wheel for polishing piston rod of vehicle shock absorber and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211548861.4A CN115741505A (en) | 2022-12-05 | 2022-12-05 | Resin fine-grain centerless grinding wheel for polishing piston rod of vehicle shock absorber and preparation method thereof |
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| Publication Number | Publication Date |
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| CN115741505A true CN115741505A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211548861.4A Pending CN115741505A (en) | 2022-12-05 | 2022-12-05 | Resin fine-grain centerless grinding wheel for polishing piston rod of vehicle shock absorber and preparation method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN115741505A (en) |
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2022
- 2022-12-05 CN CN202211548861.4A patent/CN115741505A/en active Pending
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