A grinding and tool setting method suitable for blind hole hard anodized film layer

Abstract

The present invention belongs to mechanical processing technology, and relates to a method for grinding and setting a tool for a hard anodized film layer of a blind hole. First, a tool block and a workpiece are fixed by a tool, and the coaxiality of the two is ensured to be within 0.02mm by the tool. After the workpiece and the spindle center are aligned and adjusted by a dial indicator, the grinding wheel is installed on the spindle, and the tool block is ground until sparks are generated. At this time, the position of the grinding wheel is used as the grinding reference point, and the inner hole diameter of the tool block is measured as (C), and then the inner hole diameter (B) of the workpiece to be ground is measured. By calculation, it is obtained that: the initial value of the tool setting = [(C-A) / 2]-0.1mm (safe distance), thereby determining the grinding and setting size of the workpiece. The method is simple to implement, and through the offset method and the tool setting transfer method, the tool can be accurately set, the starting point of the workpiece grinding can be determined, and the problem of grinding and setting the tool without a tool setting signal feedback sensor is solved, and the problem of not being able to find the grinding starting point of the hard anodized layer is solved. Finally, the precision size of the parts is accurately controlled, and the risk of parts being scrapped is reduced.

Description

Technical Field

[0001] The invention belongs to mechanical processing technology and relates to a tool setting method suitable for grinding a hard anodized film layer of a blind hole. Background Art

[0002] Generally, sparks will be generated when grinding steel workpieces, which can directly determine the starting point of grinding; at the same time, some equipment has sensors installed on the tool block, which will feedback signals once it is close to the workpiece to obtain the starting point of grinding. However, for hard anodized blind holes, no sparks will be generated during grinding, and it is impossible to determine whether the workpiece is ground. At the same time, the equipment does not have a signal feedback function, and the starting point of grinding cannot be collected. At the same time, the powder observation method has limitations. White paper cannot be inserted into blind holes or small holes for observation, and inserting white paper can easily affect the clamping reference of the workpiece.

[0003] The offset method is mainly used for tool setting of hard grinding wheels. After the workpiece and the spindle center are aligned through the dial indicator, the grinding wheel is installed on the spindle, the grinding wheel diameter (A) is measured, and then the inner hole diameter (B) of the workpiece to be ground is measured. The initial tool setting value is obtained by calculation: [(BA) / 2]-0.1mm (safety distance), thereby determining the grinding tool setting size.

[0004] Since the diameter measurement of soft grinding wheels is inaccurate, the tool setting transfer method is mainly applicable to tool setting of soft grinding wheels. The tool setting block is made of materials that can produce sparks when grinding, such as steel. The tool block and the workpiece are first fixed with a fixture. At the same time, the coaxiality of the two is ensured to be within 0.02mm through the fixture. After the workpiece and the spindle center are aligned and adjusted by the dial indicator, the grinding wheel is installed on the spindle and the tool setting block is ground until sparks are generated. At this time, the position of the grinding wheel is used as the grinding reference point. The inner hole diameter of the tool setting block is measured as (C), and then the inner hole diameter of the workpiece to be ground is measured (B). Through calculation, it is obtained that: the initial value of the tool setting = [(CA) / 2]-0.1mm (safety distance), thereby determining the tool setting size of the workpiece grinding. Summary of the invention

[0005] This paper proposes a method for tool setting in blind hole hard anodized film grinding to accurately find the grinding starting point of the workpiece. The offset method and tool setting transfer method are mainly used.

[0006] Technical Solution

[0007] A method for grinding and setting a tool for a blind hole hard anodized film layer comprises the following steps:

[0008] Step 1: Align the workpiece and the turntable concentrically

[0009] Lift the fixture together with the part onto the turntable; fix the fixture with magnetic suction. Check the coaxiality between the center of the part and the center of the turntable.

[0010] Step 2: Align the machine tool spindle and workpiece concentrically:

[0011] After the workpiece center coincides with the turntable center, use the dial indicator to align the spindle center with the part center. First, the dial indicator is adsorbed on the spindle, the needle presses the inner hole surface of the workpiece, and the spindle rotates. By fine-tuning the spindle position, ensure that the runout is within 0.02mm, so that the workpiece and the spindle are concentric;

[0012] Step 3: Measure and calibrate the tool:

[0013] 1) Install the grinding wheel on the spindle, measure the current grinding wheel diameter A, measure the hole diameter B of the inner hole to be processed, and determine the initial tool setting size: tool setting size = [(BA) / 2]-safety distance D, D is 0.05mm to 0.2mm,

[0014] 2) Offset the grinding wheel in the X direction to the tool size and start grinding.

[0015] Further, when a soft grinding wheel is selected in step 3, the specific operations for the soft grinding wheel are:

[0016] 1) After moving to the grinding position calculated according to the third step, grind the tool block. During the grinding process, you can fine-tune the X value until the tool block sparks; record the position of the grinding wheel at this time;

[0017] 2) Remove the tool setting block and measure the inner diameter of the tool setting block (C). Then measure the inner diameter of the workpiece to be ground (B). By calculation, we can obtain: the initial value of the workpiece tool setting = [(BC) / 2] - safety distance D. The grinding tool setting size of the workpiece is thus determined.

[0018] 3) Offset the grinding wheel in the X direction to the tool size and start grinding;

[0019] Furthermore, the dial indicator has a specification of 0-3mm and an accuracy of 0.001mm.

[0020] Furthermore, if the workpiece is not concentric with the turntable, a dial indicator is used to align the center of the inner hole of the part with the center of the turntable.

[0021] In the previous step, the specific method is: adsorb the dial indicator stand on the spindle, press the needle against the inner hole surface of the workpiece, keep the spindle still, and rotate the workpiece with the turntable. By fine-tuning the position of the workpiece, ensure that the runout is within 0.02mm.

[0022] Furthermore, in step 1, a centering chuck is used to fix the fixture.

[0023] Furthermore, the safety distance D is preferably 0.1 mm.

[0024] Furthermore, if the tool setting size is offset in diameter units in the X direction, the tool setting size = (BA) - safety distance D.

[0025] Technical Effects

[0026] This paper proposes a solution to the problem that ordinary CNC grinders cannot align the tool when grinding hard anodized layers. The method is simple to implement. Through the offset method and the tool transfer method, the tool can be accurately aligned and the starting point of workpiece grinding can be determined. The problem of grinding tool alignment without a tool setting signal feedback sensor is solved, and the problem of not being able to find the grinding starting point when grinding hard anodized layers is solved. Ultimately, the precision size of the parts can be accurately controlled to reduce the risk of part scrapping. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of tool setting for grinding;

[0028] Figure 2 Flowchart of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with embodiments. The following are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Embodiment 1:

[0031] 1. Grinding and setting tool of a certain outer cylinder

[0032] The outer cylinder is a processed workpiece, the inner diameter size before grinding is B=Φ80.45-80.46, the grinding wheel diameter A is Φ69.5, and the starting size of the workpiece tool setting size is Φ80.25.

[0033] According to the offset formula, the X direction (radius value) is offset by 5.375-5.38mm, and the reverse calculation of the tool size is Φ80.25-80.26mm. The method is effective.

[0034] 2. Bushing grinding and tool setting

[0035] The bushing is a processed workpiece and is ground with a soft grinding wheel. Sparks are generated when grinding the tool block. The inner diameter C of the tool block is measured to be Φ50.1-Φ50.2, the initial hole diameter B of the bushing is Φ80, and the workpiece tool setting size is Φ79.9mm.

[0036] According to the offset formula, the X-direction offset (radius value) is exactly 14.85-14.8mm, and the reverse calculation of the tool setting size is Φ79.7-Φ79.9mm. The method is effective.

[0037] Example 2

[0038] The tool setting method for grinding hard anodized film layers of blind holes includes the following steps:

[0039] 1. Align the workpiece and the turntable concentrically

[0040] Lift the fixture together with the part onto the turntable; fix the fixture with magnetic suction. Check the coaxiality between the center of the part and the center of the turntable.

[0041] 2. Align the machine tool spindle and workpiece concentrically:

[0042] After the workpiece center coincides with the turntable center, use the dial indicator to align the spindle center with the part center. First, the dial indicator is adsorbed on the spindle, the needle presses the inner hole surface of the workpiece, and the spindle rotates. By fine-tuning the spindle position, ensure that the runout is within 0.02mm, so that the workpiece and the spindle are concentric;

[0043] 3. Measure and set the tool:

[0044] 1) Install the grinding wheel on the spindle, measure the current grinding wheel diameter A, measure the hole diameter B of the inner hole to be processed, and determine the initial tool setting size: tool setting size = [(BA) / 2]-safety distance D, D is 0.05mm to 0.2mm,

[0045] 2) Offset the grinding wheel in the X direction to the tool size and start grinding;

[0046] Further, when a soft grinding wheel is selected in step 3, the specific operations for the soft grinding wheel are:

[0047] 1) After moving to the grinding position calculated according to the third step, grind the tool block. During the grinding process, you can fine-tune the X value until the tool block sparks; record the position of the grinding wheel at this time;

[0048] 2) Remove the tool setting block and measure the inner diameter of the tool setting block (C). Then measure the inner diameter of the workpiece to be ground (B). By calculation, we can obtain: the initial value of the workpiece tool setting = [(BC) / 2] - safety distance D. The grinding tool setting size of the workpiece is thus determined.

[0049] 3) Offset the grinding wheel in the X direction to the tool size and start grinding;

[0050] Furthermore, the dial indicator has a specification of 0-3mm and an accuracy of 0.001mm.

[0051] Furthermore, if the workpiece and the turntable are not concentric, a dial indicator is used to align the center of the inner hole of the part and the center of the turntable. (The dial indicator method can effectively display the relative position of the workpiece and the turntable)

[0052] In the previous step, the specific method is: adsorb the dial indicator frame on the spindle, press the needle against the inner hole surface of the workpiece, keep the spindle stationary, and rotate the workpiece with the turntable. Fine-tune the workpiece position to ensure that the runout is within 0.02mm. (This method uses the turntable as a reference object, and uses a dial to determine the position of the workpiece relative to the turntable to adjust the workpiece position)

[0053] Furthermore, in step 1, a centering chuck is used to fix the fixture. (The centering chuck can be self-centering, and the workpiece clamping automatically keeps it concentric with the turntable)

[0054] Furthermore, the safety distance D is preferably 0.1 mm. (Considering that the non-uniformity of the hard anodized grinding layer is generally 0.04-0.06 um, 0.1 mm is selected to avoid high points and save idle tool time)

[0055] Furthermore, if the tool setting size is offset in diameter units in the X direction, the tool setting size = (BA) - safety distance D.

[0056] (Some grinding systems set the radial diameter size to the same value, which is the default radius difference. However, some settings only require half the feed amount, which is the default diameter difference, so the feed needs to be halved.)

[0057] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined as here. The specific implementation methods described above further explain the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A grinding and setting method for hard anodized film layer of blind hole, characterized in that: The steps include: Step 1: Align the workpiece and the turntable concentrically; Lift the fixture together with the part onto the turntable; fix the fixture with magnetic disk suction; check the coaxiality between the center of the part and the center of the turntable; Step 2: Align the machine tool spindle and the workpiece concentrically; After the workpiece center coincides with the turntable center, use the dial indicator to align the spindle center with the part center. First, the dial indicator is adsorbed on the spindle, the needle presses the inner hole surface of the workpiece, and the spindle rotates. By fine-tuning the spindle position, ensure that the runout is within 0.02mm, so that the workpiece and the spindle are concentric; Step 3: Measure and calibrate the tool: 1) Install the grinding wheel on the spindle, measure the current grinding wheel diameter A, measure the hole diameter B of the inner hole to be processed, and determine the initial tool setting size: tool setting size = [(BA) / 2] - safety distance D, D is 0.05mm to 0.2mm, 2) Offset the grinding wheel in the X direction to the tool size and start grinding; When a soft grinding wheel is selected in step 3, the specific operations for the soft grinding wheel are as follows: 1) After moving to the calculated grinding position according to the method in step 3, grind the tool block. During the grinding process, you can fine-tune the X value until the tool block sparks; record the position of the grinding wheel at this time; 2) Remove the tool setting block and measure the inner diameter of the tool setting block (C). Then measure the inner diameter of the workpiece to be ground (B). By calculation, we can obtain: the initial value of the workpiece tool setting = [(BC) / 2] - safety distance D. Thus, the grinding tool setting size of the workpiece is determined. 3) Offset the grinding wheel in the X direction to the tool size and start grinding.

2. A method for grinding and setting a tool for a blind hole hard anodized film layer according to claim 1, characterized in that: The dial indicator has a specification of 0-3mm and an accuracy of 0.001mm.

3. A method for grinding and setting a tool for a blind hole hard anodized film layer according to claim 2, characterized in that: If the workpiece is not concentric with the turntable, use a dial indicator to align the center of the inner hole of the part with the center of the turntable.

4. A method for grinding and setting a tool for a blind hole hard anodized film layer according to claim 3, characterized in that: The specific method is: adsorb the dial indicator stand on the spindle, press the needle against the inner hole surface of the workpiece, keep the spindle stationary, and rotate the workpiece with the turntable. By fine-tuning the position of the workpiece, ensure that the runout is within 0.02mm.

5. A method for grinding and setting a tool for a blind hole hard anodized film layer according to claim 4, characterized in that: In the step 1, a centering chuck is used to fix the fixture.

6. A method for grinding and setting a tool for a blind hole hard anodized film layer according to claim 5, characterized in that: The safety distance D is preferably 0.1 mm.

7. The method for grinding and setting a tool for a blind hole hard anodized film layer according to claim 6, characterized in that: If the tool setting size is offset in diameter units in the X direction, the tool setting size = (BA) - safety distance D.

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