CN114905339A - A kind of processing technology of high-precision cemented carbide bar - Google Patents

Abstract

The invention discloses a processing technology of a high-precision hard alloy bar, which relates to the technical field of hard alloy processing, and is characterized in that a centerless grinder is adopted to grind an original hard alloy bar for at least 3 times, namely a first grinding, a second grinding and a third grinding, the centerless grinder comprises a guide wheel and a grinding wheel which rotate synchronously in an out-of-phase mode, grinding fluid is adopted to cool during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled. The invention adopts the centerless grinder to grind the bar for multiple times, gradually releases the processing stress in the bar, controls the grinding amount of the bar by different grinding processes, and reduces the defect of annular thread lines on the surface of the bar caused by grinding sand grains or cut materials by combining a grinding fluid filtering system, thereby preparing the high-precision hard alloy bar.

Description

A kind of processing technology of high-precision cemented carbide bar

technical field

The invention relates to the field of hard alloy processing, in particular to a processing technology for high-precision hard alloy bars.

Background technique

Due to the material properties of cemented carbide, we mainly use centerless grinding to process cemented carbide bars at this stage. Centerless grinding is to send the workpiece sent by the electromagnetic feeding device to the grinding wheel and the guide wheel smoothly through the automatic feeding device to complete the cylindrical grinding of mechanical processing. Due to the high degree of automation of the automatic feeding device, it is convenient to ensure work safety and stable operation.

In terms of high-precision fine-grinding bar products, the existing processing capacity and processing level cannot meet the accuracy and production capacity requirements of the current consumer electronics processing field. At present, most fine-grinding bar products have a radial runout control accuracy of 5um, while the industry requires The radial runout control accuracy of high-precision fine-grinding bar products is 2um, and the existing processing level is still far from the industry's precision requirements. Therefore, it is urgent to develop a production process for high-precision fine-grinding bar products to improve high-precision precision. Grinding bar production technology level, mass production of high-precision bar products that meet the precision and productivity requirements of the consumer electronics processing field.

In the process of centerless grinding, due to the material properties of cemented carbide, the end face of the thin rod is easily impacted by the moving grinding wheel, resulting in chipping or micro-cracks, resulting in a high rejection rate of the product. Increased production costs. In the process of fine grinding, if there is too much allowance in one grinding or the grinding wheel is too rough, very fine threads are produced on the surface of the part. The inclination angle of the guide wheel is too large, so that the cutting amount of the part is too fast, resulting in insufficient surface finish of the part. The front and rear guide plates are evenly inclined to one side of the grinding wheel, resulting in a large part in the middle and a small part in the middle. Therefore, the parameters of the control device are very important for the preparation of the fine grinding rod.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a processing technology for high-precision cemented carbide rods.

The technical solution of the present invention is as follows:

A processing technology for high-precision hard alloy bars, which uses centerless grinding to grind the original hard alloy bars at least three times, namely the first grinding, the second grinding and the third grinding, respectively. The centerless grinding includes a guide wheel and a grinding wheel that rotate synchronously in different phases. During grinding, a grinding fluid is used for cooling, and the ground grinding fluid enters a filtration system for filtration and is recycled for use.

As a preferred solution of the present invention, in the first grinding, the feed amount is 0.04-0.06mm, the horizontal angle of the guide wheel is 1-3°, the vertical angle of the guide wheel is 2-3°, and the mesh number of the grinding wheel is 80-120 mesh, the speed of the guide wheel is 80-100rpm.

As a preferred solution of the present invention, in the second grinding, the feed amount is 0.02-0.03mm, the horizontal angle of the guide wheel is 2-3°, the vertical angle of the guide wheel is 2-3°, and the mesh number of the grinding wheel is 200-400 mesh, the speed of the guide wheel is 80-100rpm.

As a preferred solution of the present invention, in the third grinding, the feed amount is 0.007-0.009mm, the horizontal angle of the guide wheel is 1-2°, the vertical angle of the guide wheel is 1-3°, and the mesh number of the grinding wheel is 600-900 mesh, the speed of the guide wheel is 70-80rpm.

As a preferred solution of the present invention, the radial runout of the raw cemented carbide bar material is controlled at 0.008-0.010mm.

As a preferred solution of the present invention, the feed taper of the original cemented carbide bar is controlled at 0.008-0.010mm.

As a preferred solution of the present invention, the feed roundness of the original cemented carbide bar is 0.003-0.007 mm.

As a preferred solution of the present invention, the storage environment temperature of the original cemented carbide bar is 22±2°C.

As a preferred solution of the present invention, the guide wheel and/or the grinding wheel contains aluminum powder, and the grinding fluid contains hydroxide ions.

The beneficial effects of the present invention are: the present invention uses centerless grinding to grind the bar material in multiple passes, gradually releasing the machining stress in the bar material, and simultaneously controls the grinding amount of the bar material through different grinding processes, and also controls the original bar. The storage temperature of the material can reduce the processing influence caused by the thermal expansion and contraction of the bar; and combined with the grinding fluid filtration system, it can reduce the defect of the circular thread on the surface of the bar caused by the sand or cutting material after grinding, so that the High precision carbide bar stock. Furthermore, the grinding wheel and/or the guide wheel contain aluminum powder, which will react with the hydroxide ions in the grinding fluid to generate gas. After the gas is discharged, it will generate fine holes in the grinding wheel and the guide wheel, which is conducive to chip resistance and corrosion resistance. The adhesion of the grinding fluid prevents the chips from sticking to the surface of the grinding wheel and damaging the bar.

Detailed ways

The following examples further illustrate the technical solutions of the present invention.

The storage environment temperature of the original cemented carbide bars described in the following examples is 22±2°C.

Example 1

A processing technology of high-precision hard alloy bar, which uses centerless grinding to grind the original hard alloy bar three times, namely the first grinding, the second grinding and the third grinding, so the The centerless grinding includes a guide wheel and a grinding wheel that rotate synchronously in different phases. During grinding, a grinding fluid is used for cooling, and the ground grinding fluid enters a filtration system for filtration and is recycled for use.

The diameter of the original bar is 5mm, and the incoming allowance is 0.06mm carbide bar.

In the first grinding, the feed amount was 0.04 mm, the horizontal angle of the guide wheel was 2°, the vertical angle of the guide wheel was 2.5°, the mesh number of the grinding wheel was 100 mesh, and the rotational speed of the guide wheel was 90 rpm.

In the second grinding, the feed amount is 0.02 mm, the horizontal angle of the guide wheel is 2.5°, the vertical angle of the guide wheel is 2.5°, the mesh number of the grinding wheel is 300 mesh, and the rotational speed of the guide wheel is 90 rpm.

In the third grinding, the feed amount is 0.008mm, the horizontal angle of the guide wheel is 1.5°, the vertical angle of the guide wheel is 2°, the mesh number of the grinding wheel is 800 mesh, and the rotational speed of the guide wheel is 75 rpm.

The radial runout of the raw carbide bar stock was controlled at 0.008mm.

The feed taper of the original cemented carbide bar is controlled at 0.008mm.

The feed roundness of the original cemented carbide bar stock is 0.005mm.

The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;

Among them, the wear-resistant surface is obtained by the following steps of mixing, pressing, flat grinding, sandblasting, bonding, curing and trimming of the following raw materials, and the raw materials of the wear-resistant surface are: 30 parts of polyamide resin, 40 parts of polyamide sub-resin , 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide, and 25 parts of aluminum powder.

The grinding fluid includes the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate, and 40 parts of deionized water.

Example 2

A processing technology of high-precision hard alloy bar, which uses centerless grinding to grind the original hard alloy bar three times, namely the first grinding, the second grinding and the third grinding, so the The centerless grinding includes a guide wheel and a grinding wheel that rotate synchronously in different phases. During grinding, a grinding fluid is used for cooling, and the ground grinding fluid enters a filtration system for filtration and is recycled for use.

The diameter of the original bar is 5mm, and the incoming allowance is 0.06mm carbide bar.

In the first grinding, the feed amount is 0.05mm, the horizontal angle of the guide wheel is 2°, the vertical angle of the guide wheel is 2.5°, the mesh number of the grinding wheel is 100 mesh, and the rotational speed of the guide wheel is 90 rpm.

In the second grinding, the feed amount is 0.025mm, the horizontal angle of the guide wheel is 2.5°, the vertical angle of the guide wheel is 2.5°, the mesh number of the grinding wheel is 300 mesh, and the rotational speed of the guide wheel is 90 rpm.

In the third grinding, the feed amount is 0.007mm, the horizontal angle of the guide wheel is 2°, the vertical angle of the guide wheel is 2.5°, the mesh number of the grinding wheel is 800 meshes, and the rotational speed of the guide wheel is 75 rpm.

The radial runout of the raw carbide bar stock was controlled at 0.008mm.

The feed taper of the original cemented carbide bar is controlled at 0.008mm.

The feed roundness of the original cemented carbide bar stock is 0.005mm.

The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;

Among them, the wear-resistant surface is obtained by the following steps of mixing, pressing, flat grinding, sandblasting, bonding, curing and trimming of the following raw materials, and the raw materials of the wear-resistant surface are: 30 parts of polyamide resin, 40 parts of polyamide sub-resin , 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide, and 25 parts of aluminum powder.

The grinding fluid includes the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate, and 40 parts of deionized water.

Example 3

A processing technology of high-precision hard alloy bar, which uses centerless grinding to grind the original hard alloy bar three times, namely the first grinding, the second grinding and the third grinding, so the The centerless grinding includes a guide wheel and a grinding wheel that rotate synchronously in different phases. During grinding, a grinding fluid is used for cooling, and the ground grinding fluid enters a filtration system for filtration and is recycled for use.

The diameter of the original bar is 5mm, and the incoming allowance is 0.06mm carbide bar.

In the first grinding, the feed amount was 0.06 mm, the horizontal angle of the guide wheel was 2°, the vertical angle of the guide wheel was 2.5°, the mesh number of the grinding wheel was 100 mesh, and the rotational speed of the guide wheel was 90 rpm.

In the second grinding, the feed amount is 0.03 mm, the horizontal angle of the guide wheel is 2.5°, the vertical angle of the guide wheel is 3°, the mesh number of the grinding wheel is 300 mesh, and the rotational speed of the guide wheel is 90 rpm.

In the third grinding, the feed amount is 0.008mm, the horizontal angle of the guide wheel is 1.5°, the vertical angle of the guide wheel is 2°, the mesh number of the grinding wheel is 800 mesh, and the rotational speed of the guide wheel is 80 rpm.

The radial runout of the raw carbide bar stock was controlled at 0.008mm.

The feed taper of the original cemented carbide bar is controlled at 0.008mm.

The feed roundness of the original cemented carbide bar stock is 0.005mm.

The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;

Among them, the wear-resistant surface is obtained by the following steps of mixing, pressing, flat grinding, sandblasting, bonding, curing and trimming of the following raw materials, and the raw materials of the wear-resistant surface are: 30 parts of polyamide resin, 40 parts of polyamide sub-resin , 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide, and 25 parts of aluminum powder.

The grinding fluid includes the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate, and 40 parts of deionized water.

Example 4

A processing technology of high-precision hard alloy bar, which uses centerless grinding to grind the original hard alloy bar three times, namely the first grinding, the second grinding and the third grinding, so the The centerless grinding includes a guide wheel and a grinding wheel that rotate synchronously in different phases. During grinding, a grinding fluid is used for cooling, and the ground grinding fluid enters a filtration system for filtration and is recycled for use.

The diameter of the original bar is 5mm, and the incoming allowance is 0.06mm carbide bar.

In the first grinding, the feed amount is 0.05mm, the horizontal angle of the guide wheel is 2°, the vertical angle of the guide wheel is 2.5°, the mesh number of the grinding wheel is 100 mesh, and the rotational speed of the guide wheel is 90 rpm.

In the second grinding, the feed amount is 0.03 mm, the horizontal angle of the guide wheel is 2.5°, the vertical angle of the guide wheel is 2.5°, the mesh number of the grinding wheel is 400 mesh, and the rotational speed of the guide wheel is 90 rpm.

In the third grinding, the feed amount is 0.009 mm, the horizontal angle of the guide wheel is 2°, the vertical angle of the guide wheel is 2°, the mesh number of the grinding wheel is 900 mesh, and the rotational speed of the guide wheel is 75 rpm.

The radial runout of the raw carbide bar stock was controlled at 0.008mm.

The feed taper of the original cemented carbide bar is controlled at 0.009mm.

The feed roundness of the original cemented carbide bar stock is 0.006 mm.

The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;

Among them, the wear-resistant surface is obtained by the following steps of mixing, pressing, flat grinding, sandblasting, bonding, curing and trimming of the following raw materials, and the raw materials of the wear-resistant surface are: 30 parts of polyamide resin, 40 parts of polyamide sub-resin , 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide, and 25 parts of aluminum powder.

The grinding fluid includes the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate, and 40 parts of deionized water.

Example 5

A processing technology of high-precision hard alloy bar, which uses centerless grinding to grind the original hard alloy bar three times, namely the first grinding, the second grinding and the third grinding, so the The centerless grinding includes a guide wheel and a grinding wheel that rotate synchronously in different phases. During grinding, a grinding fluid is used for cooling, and the ground grinding fluid enters a filtration system for filtration and is recycled for use.

The diameter of the original bar is 5mm, and the incoming allowance is 0.06mm carbide bar.

In the first grinding, the feed amount is 0.05mm, the horizontal angle of the guide wheel is 2°, the vertical angle of the guide wheel is 3°, the mesh number of the grinding wheel is 100 mesh, and the rotational speed of the guide wheel is 100 rpm.

In the second grinding, the feed amount is 0.02 mm, the horizontal angle of the guide wheel is 2.5°, the vertical angle of the guide wheel is 2.5°, the mesh number of the grinding wheel is 400 mesh, and the rotational speed of the guide wheel is 90 rpm.

In the third grinding, the feed amount is 0.008mm, the horizontal angle of the guide wheel is 2°, the vertical angle of the guide wheel is 2°, the mesh number of the grinding wheel is 900 mesh, and the rotational speed of the guide wheel is 80 rpm.

The radial runout of the raw carbide bar stock was controlled at 0.008mm.

The feed taper of the original cemented carbide bar is controlled at 0.008mm.

The feed roundness of the raw cemented carbide bars is 0.007 mm.

The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;

Among them, the wear-resistant surface is obtained by the following steps of mixing, pressing, flat grinding, sandblasting, bonding, curing and trimming of the following raw materials, and the raw materials of the wear-resistant surface are: 30 parts of polyamide resin, 40 parts of polyamide sub-resin , 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide, and 25 parts of aluminum powder.

The grinding fluid includes the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate, and 40 parts of deionized water.

Comparative example 1 (one processing)

A processing technology for high-precision hard alloy bars, which uses centerless grinding to grind the original hard alloy bars, the feed amount is 0.02mm, the horizontal angle of the guide wheel is 2.5°, and the vertical angle of the guide wheel is 2.5° , the mesh number of the grinding wheel is 300 mesh, and the speed of the guide wheel is 90 rpm. The centerless grinding includes a guide wheel and a grinding wheel that rotate synchronously in different phases. The grinding fluid is used for cooling during grinding, and the grinding fluid after grinding enters the filtration system for filtration. Recycle later.

The diameter of the original bar is 5mm, and the incoming allowance is 0.06mm carbide bar.

The radial runout of the raw carbide bar stock was controlled at 0.008mm.

The feed taper of the original cemented carbide bar is controlled at 0.008mm.

The feed roundness of the original cemented carbide bar stock is 0.005mm.

The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;

Among them, the wear-resistant surface is obtained by the following steps of mixing, pressing, flat grinding, sandblasting, bonding, curing and trimming of the following raw materials, and the raw materials of the wear-resistant surface are: 30 parts of polyamide resin, 40 parts of polyamide sub-resin , 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, 35 parts of cerium oxide, and 25 parts of aluminum powder.

The grinding fluid includes the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate, and 40 parts of deionized water.

Comparative example 2 (without aluminum powder)

A processing technology of high-precision hard alloy bar, which uses centerless grinding to grind the original hard alloy bar three times, namely the first grinding, the second grinding and the third grinding, so the The centerless grinding includes a guide wheel and a grinding wheel that rotate synchronously in different phases. During grinding, a grinding fluid is used for cooling, and the ground grinding fluid enters a filtration system for filtration and is recycled for use.

The diameter of the original bar is 5mm, and the incoming allowance is 0.06mm carbide bar.

In the first grinding, the feed amount was 0.04 mm, the horizontal angle of the guide wheel was 2°, the vertical angle of the guide wheel was 2.5°, the mesh number of the grinding wheel was 100 mesh, and the rotational speed of the guide wheel was 90 rpm.

In the second grinding, the feed amount is 0.02 mm, the horizontal angle of the guide wheel is 2.5°, the vertical angle of the guide wheel is 2.5°, the mesh number of the grinding wheel is 300 mesh, and the rotational speed of the guide wheel is 90 rpm.

In the third grinding, the feed amount is 0.008mm, the horizontal angle of the guide wheel is 1.5°, the vertical angle of the guide wheel is 2°, the mesh number of the grinding wheel is 800 mesh, and the rotational speed of the guide wheel is 75 rpm.

The radial runout of the raw carbide bar stock was controlled at 0.008mm.

The feed taper of the original cemented carbide bar is controlled at 0.008mm.

The feed roundness of the original cemented carbide bar stock is 0.005mm.

The wear-resistant surfaces of the guide wheel and the grinding wheel contain aluminum powder, and the grinding fluid contains hydroxide ions;

Among them, the wear-resistant surface is obtained by the following steps of mixing, pressing, flat grinding, sandblasting, bonding, curing and trimming of the following raw materials, and the raw materials of the wear-resistant surface are: 30 parts of polyamide resin, 40 parts of polyamide sub-resin , 18 parts of diamond, 20 parts of boron nitride, 65 parts of silicon carbide, 3 parts of polytetrafluoroethylene, and 35 parts of cerium oxide.

The grinding fluid includes the following components in parts by weight: 10 parts of dodecenylsuccinic acid half ester, 30 parts of triethanolamine, 10 parts of sodium hydroxide, 20 parts of sodium molybdate, and 40 parts of deionized water.

The radial runout detector was used to detect the performance of the radial runout in the above-mentioned embodiments and comparative examples, and the test results are shown in the following table. (The radial runout is used to detect the deviation of the shaft, check the roundness of the shaft at a certain point and the deviation of the shaft relative to the reference line.)

It can be seen from the above table that the radial runout of the embodiment is smaller than that of the comparative example, and the possible reasons are as follows. The analysis of the comparative example shows that in the embodiment, the machining stress in the bar material is gradually released after multiple grinding processes. The unique grinding process, the control of the grinding amount of the bar, and the combination of the grinding fluid filtration system, reduce the defect of the ring thread on the surface of the bar caused by the sand or cutting material after grinding, so as to obtain high-precision cemented carbide bar stock. The analysis of Comparative Example 2 shows that the wear-resistant surfaces of the grinding wheel and the guide wheel contain aluminum powder, which will react with the hydroxide ions in the grinding fluid to generate gas. Holes are conducive to the adhesion of chips and grinding fluid, and prevent chips from sticking to the surface of the grinding wheel to damage the bar, thereby reducing the surface defects of the bar and improving its accuracy.

Under the premise of no conflict, those skilled in the art can freely combine and superimpose the above additional technical features.

The above are only the preferred embodiments of the present invention, as long as the technical solutions that achieve the purpose of the present invention by basically the same means fall within the protection scope of the present invention.

Claims (9)

1. The machining process of the high-precision hard alloy bar is characterized in that a centerless grinder is used for grinding an original hard alloy bar at least 3 times, namely a first grinding, a second grinding and a third grinding, the centerless grinder comprises a guide wheel and a grinding wheel which rotate out of phase and synchronously, grinding fluid is used for cooling during grinding, and the grinding fluid after grinding enters a filtering system to be filtered and then is recycled.

2. A processing technology of a high-precision hard alloy bar according to claim 1, wherein in the first grinding, the feed amount is 0.04-0.06mm, the horizontal angle of a guide wheel is 1-3 degrees, the vertical angle of the guide wheel is 2-3 degrees, the mesh number of grinding wheels is 80-120 meshes, and the rotating speed of the guide wheel is 80-100 rpm.

3. The processing technology of the high-precision hard alloy bar as claimed in claim 1, wherein in the second grinding, the feed amount is 0.02-0.03mm, the horizontal angle of the guide wheel is 2-3 degrees, the vertical angle of the guide wheel is 2-3 degrees, the mesh number of the grinding wheel is 200-400 meshes, and the rotating speed of the guide wheel is 80-100 rpm.

4. The processing technology of the high-precision hard alloy bar as claimed in claim 1, wherein in the third grinding, the feed amount is 0.007-0.009mm, the horizontal angle of the guide wheel is 1-2 degrees, the vertical angle of the guide wheel is 1-3 degrees, the number of grinding wheels is 600-900 meshes, and the rotating speed of the guide wheel is 70-80 rpm.

5. A process of manufacturing a high precision cemented carbide rod according to claim 1, wherein the radial run out of the raw cemented carbide rod feed is controlled at 0.008-0.010 mm.

6. A high precision cemented carbide rod as claimed in claim 1, wherein the feed taper of the raw cemented carbide rod is controlled to 0.008-0.010 mm.

7. A high precision hard alloy bar processing technology as claimed in claim 1, wherein the feed roundness of the original hard alloy bar is 0.003-0.007 mm.

8. A process for manufacturing a high precision cemented carbide rod according to claim 1, wherein the original cemented carbide rod is kept at an ambient temperature of 22 ± 2 ℃.

9. A high-precision hard alloy bar material processing technology as claimed in claim 1, wherein the guide wheel and/or the grinding wheel contains aluminum powder, and the grinding fluid contains hydroxide ions.