A design method for a high wear-resistant workpiece grinding wheel

Abstract

The present invention discloses a method for designing a grinding disc for a highly wear-resistant workpiece, which relates to the field of precision machining of highly wear-resistant workpieces and includes the following steps: (1) determining the process dimension parameters of the grinding process; (2) dividing the grinding disc into regions; (3) calculating the track density of points on the workpiece relative to each divided region of the grinding disc; (4) calculating the area of ​​different regions in proportion based on the track density of the regions to obtain a grinding disc pattern; (5) obtaining a patterned grinding disc by machining or arranging hot-pressed sintered blocks per unit area according to the grinding disc pattern. The present invention quickly obtains the pattern of the grinding disc based on the track density distribution during the grinding process and has the ability to realize the design of grinding discs with complex shapes. The method effectively improves the uniformity of grinding disc wear during the grinding process, improves the surface accuracy of the workpiece, shortens the grinding time, and improves the processing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-precision machining, and in particular to a method for designing a grinding disc for a highly wear-resistant workpiece. Background Art

[0002] Materials such as silicon carbide (SiC), diamond, and gallium nitride (GaN) possess excellent physical properties, including wide bandgap, high thermal conductivity, good thermal stability, and high saturation drift, and are widely used in high-frequency, high-temperature, radiation-resistant, and optoelectronic fields. However, the industrial applications of these materials place extremely high demands on their surface quality. Furthermore, their extremely high hardness and chemical inertness make them highly wear-resistant and difficult to machine, hindering their widespread industrial application.

[0003] Grinding, as a key method for precision and ultra-precision machining, can achieve excellent surface quality and is therefore widely used in the processing of semiconductor substrates. However, during the face grinding of highly wear-resistant workpieces, grinding discs inevitably wear, resulting in a loss of flatness. These surface errors are transferred to the workpiece surface during machining, negatively impacting surface accuracy. When flatness errors exceed the allowable range, the grinding disc must be trimmed, which not only reduces its lifespan but also reduces production efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a grinding wheel design method for high wear-resistant workpieces, which calculates the area of ​​different regions according to the track density distribution on the grinding wheel, thereby solving the problems of low processing efficiency of existing high wear-resistant workpieces, uneven grinding wheel wear, and large workpiece surface error.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A method for designing a grinding disc for a highly wear-resistant workpiece comprises the following steps:

[0007] (1) First, determine the process size parameters of the grinding process: the process parameters of the grinding process include the grinding wheel speed ω m and workpiece speed ω w Or sun gear speed ω s , the radius r and R of the workpiece and grinding wheel, and the eccentricity e; (2) divide the grinding wheel into regions; (3) calculate the point P on the workpiece i Relative to the track density of the grinding wheel in each divided area; (4) based on the track density of the area, the area of ​​the different areas is calculated proportionally to obtain the grinding wheel pattern; (5) according to the grinding wheel pattern, a patterned grinding wheel is obtained by mechanical processing or arranging the hot-pressed sintered blocks per unit area.

[0008] When the grinding wheel is divided into areas, the divided areas can be concentric rings with the center point of the grinding wheel as the center, or can be rectangles arranged in an array with equal areas.

[0009] When the grinding wheel is divided into areas, the divided areas can be concentric rings with the center point of the grinding wheel as the center, or can be rectangles arranged in an array with equal areas.

[0010] The actual area of ​​different divided areas of the grinding wheel is calculated according to the formula Calculate, where A b is the cardinal area, A b Not greater than the area of ​​the maximum trajectory density, ρ max is the maximum trajectory density in all partitioned areas, ρ u is the trajectory density of the divided area.

[0011] The base of the grinding disc obtained by mechanical processing is active metal.

[0012] The hot-pressed sintered block is made by hot-pressing and sintering active metal powder and abrasive particles.

[0013] The present invention provides a method for designing a grinding wheel for a highly wear-resistant workpiece. The method calculates the track density of different divided areas, proportionally calculates the area of ​​each area based on the track density of each area, and obtains a grinding wheel pattern. The method then arranges the patterned grinding wheel through machining or hot-pressed sintered blocks per unit area. The method rapidly obtains a grinding wheel pattern based on the track density during end face grinding, and is capable of designing grinding wheels with complex shapes. This method enables the rapid design and precise production of complex patterns. It effectively improves the uniformity of grinding wheel wear during end face grinding, enhances the surface accuracy of the workpiece, shortens grinding time, and improves processing efficiency.

[0014] The present invention provides a method for designing a grinding wheel for a highly wear-resistant workpiece, which has the following beneficial effects:

[0015] 1. The present invention effectively solves the problem of uneven wear of the grinding disc and achieves uniform wear of the processing area;

[0016] 2. The present invention obtains the grinding disc by mechanical processing, which reduces the difficulty and cost of manufacturing the grinding disc;

[0017] 3. The present invention effectively improves the processing efficiency and surface accuracy of highly wear-resistant workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The design method flow provided by the embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a single-sided grinding process provided in Example 1 of the present invention;

[0020] Figure 3 A schematic diagram of the grinding wheel area segmentation provided in Example 1 of the present invention;

[0021] Figure 4 The single-sided grinding disc pattern provided in Example 1 of the present invention;

[0022] Figure 5 Schematic diagram of double-end surface grinding provided in Example 2 of the present invention;

[0023] Figure 6 This is the double-end grinding disc pattern provided in Example 2 of the present invention.

[0024] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0025] A method for designing a grinding disc for a highly wear-resistant workpiece comprises the following steps:

[0026] (1) First, determine the process size parameters of the grinding process: the process size parameters of the grinding process include the grinding wheel speed ω m and workpiece speed ω w Or sun gear speed ω s , the radius r and R of the workpiece and the grinding wheel, and the eccentricity e; (2) the grinding wheel is divided into areas; (3) the point P on the workpiece i relative to the track density of each divided area of ​​the grinding wheel; (4) calculating the area of ​​different areas in proportion based on the track density of the area to obtain the grinding wheel pattern; (5) arranging the patterned grinding wheel by machining or hot pressing and sintering blocks per unit area according to the grinding wheel pattern.

[0027] When the grinding wheel is divided into areas, the divided areas can be concentric rings with the center point of the grinding wheel as the center, or can be rectangles arranged in an array with equal areas.

[0028] The actual area of ​​different divided areas of the grinding wheel is calculated according to the formula Calculate, where A b is the cardinal area, A b Not greater than the area of ​​the maximum trajectory density, ρ max is the maximum trajectory density in all partitioned areas, ρ u is the trajectory density of the divided area.

[0029] The base of the grinding disc obtained by mechanical processing is active metal.

[0030] The hot-pressed sintered block is made by hot-pressing and sintering active metal powder and abrasive particles.

[0031] Example 1

[0032] A method for designing a grinding disc for a highly wear-resistant workpiece comprises the following steps:

[0033] Step 1: Determine the process size parameters for single-sided grinding:

[0034] The process size parameters of the single-sided grinding process include the workpiece speed ω w and grinding wheel speed ω m The speeds are 60 rpm and 100 rpm respectively, the workpiece radius r and the grinding wheel radius R are 50 mm and 360 mm respectively, and the eccentricity e is 90 mm. Figure 2 shown.

[0035] Step 2: Divide the grinding disc surface area:

[0036] The grinding wheel is divided into concentric rings, and the difference between the inner and outer radius of each concentric ring is 10mm. Figure 3 shown

[0037] Step 3: Calculate the track density of each divided area of ​​the grinding wheel:

[0038] The workpiece surface is divided into grids with a spacing of 1 mm. According to the formula Calculate the track length of all grid points on the workpiece in the concentric ring area on the grinding wheel, (x i ,y i ) is point P i The coordinates of t p is the time step, and then calculate the trajectory density ρ of each area u .

[0039] Step 4: Calculate the area of ​​different regions to obtain the grinding wheel graph;

[0040] Based on the trajectory density of the area, according to the formula Calculate the actual area of ​​different regions, where A b The base area is set to 3550mm 2 ;

[0041] Step 5: obtain a patterned grinding disc by machining, such as Figure 4 shown.

[0042] The excess areas of different segmented regions in the grinding disc are removed by mechanical processing to obtain a patterned grinding disc.

[0043] Example 2

[0044] A method for designing a grinding disc for a highly wear-resistant workpiece comprises the following steps:

[0045] Step 1: Determine the process size parameters for double-end surface grinding:

[0046] The process parameters of the double-end surface grinding process include the sun gear ω sWith grinding wheel m The rotation speeds are 10 rpm and 80 rpm respectively, the workpiece radius r and the grinding wheel radius R are 50 mm and 150 mm respectively, and the eccentricity e is 58 mm. Figure 5 shown.

[0047] Step 2: Divide the grinding disc surface area:

[0048] The grinding wheel is divided into concentric rings, and the difference between the inner and outer radius of each concentric ring is 20mm;

[0049] Step 3: Calculate the track density of each divided area of ​​the grinding wheel:

[0050] The workpiece surface is divided into grids with a spacing of 1 mm. According to the formula Calculate the track length of all grid points on the workpiece in the concentric ring area on the grinding wheel, (x i ,y i ) is point P i The coordinates of t p is the time step, and then calculate the trajectory density ρ of each area u .

[0051] Step 4: Calculate the area of ​​different regions to obtain the grinding wheel graph;

[0052] Based on the trajectory density of different circular areas, according to the formula Calculate the actual area of ​​the segmented areas of different circular regions, where A b The base area is set to 25000mm 2 ;

[0053] Step 5: obtain a patterned grinding disc by machining, such as Figure 6 shown.

[0054] The excess areas of different segmented regions in the grinding disc are removed by mechanical processing to obtain a patterned grinding disc.

[0055] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A method for designing a grinding wheel for a highly wear-resistant workpiece, characterized in that: The following steps are involved: (1) Determine the process size parameters of the grinding process: the process size parameters of the grinding process include the grinding wheel speed ω m and workpiece speed ω w Or sun gear speed ω s , the radius r and R of the workpiece and grinding wheel, and the eccentricity e; (2) divide the grinding wheel into regions; (3) calculate the point P on the workpiece i relative to the track density of the grinding wheel in each divided area; (4) calculating the area of ​​different areas in proportion based on the track density of the area to obtain a grinding wheel pattern; (5) arranging the patterned grinding wheel by machining or hot pressing and sintering blocks per unit area according to the grinding wheel pattern; The grinding wheel is divided into regions, wherein the divided regions are concentric circles with the center point of the grinding wheel as the center; The actual area of ​​different divided areas of the grinding wheel is calculated according to the formula Calculate, where A b is the cardinal area, A b Not larger than the area of ​​the region with the largest trajectory density, ρ max is the maximum trajectory density in all partitioned areas, ρ u is the trajectory density of the divided area; The workpiece surface is divided into grids with a spacing of 1 mm. According to the formula Calculate the track length of all grid points on the workpiece in the concentric ring area on the grinding wheel, (x i ,y i ) is point P i The coordinates of t p is the time step, and then calculate the trajectory density ρ of each area u .

2. The method for designing a grinding wheel for a high wear-resistant workpiece according to claim 1, wherein: The base of the grinding disc obtained by machining is an active metal.

3. The method for designing a grinding wheel for a high wear-resistant workpiece according to claim 1, wherein: The hot-pressed sintered block is made by hot-pressing and sintering active metal powder and abrasive particles.

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