Clamping device and machining method for dial thin-wall part

Abstract

The clamping device comprises a base and sealing lacquer flow guide strips, a sealing lacquer flow guide groove is formed in the upper end face of the base, a first positioning face is arranged on the outer circumference of the sealing lacquer flow guide groove, the sealing lacquer flow guide strips are evenly and circumferentially distributed in the center of the base, and a second positioning face is formed on the upper end faces of the sealing lacquer flow guide strips. The first positioning face and the second positioning face are used for containing blank workpieces, the sealing lacquer flow guide groove is used for containing solid sealing lacquer particles, and a three-jaw installation hole is formed in the lower end face of the base and used for installing a three-jaw chuck. The clamping device can provide appropriate clamping force when the blank workpiece is machined, it can be guaranteed that the blank workpiece is stable and reliable when subjected to cutting force in the machining process, plastic deformation cannot be generated in the clamping process and after the blank workpiece is disassembled, and the drawing precision requirement is met. According to the machining method, according to the dial obtained by machining the blank workpiece, the indexing precision of the indexing scribed line is superior to 1 ', the scribed line width is smaller than 0.2 mm, the consistency of the scribed line width is within 0.01 mm, and the machining precision of the dial is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of precision machining of thin-walled dial parts, and in particular to a clamping device and a machining method for thin-walled dial parts. Background Art

[0002] The scale is a key component of a laser measuring device. In order to improve the measurement accuracy of the laser measuring device, the scale graduation accuracy is required to be better than 1', the line width is less than 0.2mm, and the line width consistency is required to be within 0.01mm. Fig.13 The blank workpiece required for the dial processing is an irregular aluminum plate with a thickness of 0.5mm, a length of 210mm, and a width of 210mm. Fig.15 As shown in the figure, since the edge of the rough workpiece is a thin-walled part with a large area, the edges of its burrs are not vertical and are easily deformed or even bent by external forces.

[0003] In the actual processing of the dial, the blank workpiece is clamped and cut with flat-nose pliers and a pressure plate. The clamping force or pressing force generated will cause elastic deformation of the blank workpiece, affecting the processing accuracy. If the clamping force must be reduced in order to reduce the elastic deformation of the blank workpiece, when the clamping force cannot resist the cutting force, the blank workpiece will loosen or even fly out, resulting in the scrapping of the blank workpiece and unsafe processing; if a larger clamping force is used, the blank workpiece will be plastically deformed, which will also cause the blank workpiece to be scrapped.

[0004] In order to solve the above technical problems, a clamping device and a processing method for thin-walled dial parts are provided. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a clamping device for thin-walled dial parts, the structure of which can provide appropriate clamping force when processing the blank workpiece, which can not only ensure that the blank workpiece is stable and reliable when subjected to cutting force during processing, but also prevent plastic deformation during the clamping process and after the blank workpiece is disassembled.

[0006] The present invention also provides a processing method using a clamping device for a thin-walled dial. The dial obtained by processing the blank workpiece has a graduation line graduation accuracy better than 1', a graduation line width less than 0.2mm, and a graduation line width consistency within 0.01mm, which significantly improves the processing accuracy of the dial.

[0007] The present invention solves the technical problem by the following technical solutions:

[0008] A clamping device for thin-walled parts of a dial comprises a base and a sealing wax guide strip, wherein the upper end surface of the base is provided with a sealing wax guide groove, the outer circumference of the sealing wax guide groove is provided with a positioning surface one, the sealing wax guide strip is evenly distributed circumferentially at the center of the base, the upper end surface of the sealing wax guide strip forms a positioning surface two, the positioning surface one and the positioning surface two are used for placing a blank workpiece, the sealing wax guide groove is used for placing solid sealing wax particles, and the lower end surface of the base is provided with a three-claw mounting hole for mounting a three-claw chuck.

[0009] Furthermore, solid sealing wax particles are placed in the center of the sealing wax guide groove, and the hot-melted solid sealing wax particles are evenly filled in the sealing wax guide groove through the sealing wax guide strip.

[0010] A processing method using a clamping device for a thin-walled plate includes the following steps:

[0011] S1. Clamping of blank workpiece:

[0012] S1.1 Preheating of base and solid wax particles:

[0013] Install the base on the constant temperature furnace, and put the solid sealing wax particles into the center of the sealing wax guide groove of the base;

[0014] Open the constant temperature furnace, adjust the temperature at 100°C to 150°C, and heat the base and solid sealing wax particles for 3 to 5 minutes. The solid sealing wax particles melt into liquid sealing wax and fill the sealing wax guide groove of the base. The liquid sealing wax liquid level is flush with the positioning surface 1 of the base and the upper end surface of the sealing wax guide strip to form the positioning surface 2.

[0015] S1.2 Positioning and installation of blank workpiece:

[0016] The rough workpiece is installed on the base in a horizontal push manner, and the lower end surface of the rough workpiece contacts with the first positioning surface of the base and the upper end surface of the sealing wax guide strip to form the second positioning surface;

[0017] S1.3 Solidification of the blank workpiece:

[0018] Close the constant temperature furnace, place a pressing weight on the upper end surface of the blank workpiece, and after the liquid sealing wax cools and solidifies, the blank workpiece is bonded to the base; after the temperature of the blank workpiece, the base and the constant temperature furnace drops to room temperature, remove the pressing weight, and remove the base with the bonded blank workpiece from the constant temperature furnace;

[0019] S1.4 Install the base of the bonded blank workpiece onto the machine tool:

[0020] Install the three-jaw chuck on the machine bed, align the center of the three-jaw and input its X\Y position coordinates into the machine coordinate system;

[0021] Install the base of the bonded rough workpiece onto the three-jaw chuck, use the outer cylindrical surface of the three-jaw chuck jaws to contact the three-jaw mounting hole of the base, and move the positive jaws outward until the base of the bonded rough workpiece is locked; the three-jaw chuck has a self-centering function, and the X\Y position coordinate value of the base circle center coincides with the position coordinate value of the three-jaw center, and the position coordinate value is the processing origin of the X\Y plane;

[0022] S2. Processing the blank workpiece into a dial:

[0023] S2.1 Determine the position coordinates of the blank workpiece:

[0024] The position coordinates of the blank workpiece are the position coordinate values ​​of the X\Y\Z axis of the machine tool. S1.4 obtains the machining origin of the X\Y plane and measures the Z value coordinate of the upper end face of the blank workpiece through the 3D finder provided by the machine tool.

[0025] S2.2 Use φ6 milling cutter to process φ170 mm outer circle, remove residual waste;

[0026] S2.3 Use φ6 milling cutter to process φ70 mm inner hole;

[0027] S2.4 Use a vernier caliper to check the outer diameter and inner hole size of the blank workpiece, and use a file to trim the edge burrs;

[0028] S2.5 Use φ0.2 milling cutter to process scale line groove and digital identification groove;

[0029] S2.6 Use 0.19mm, 0.2mm and 0.21mm needle gauges to check the consistency of the groove width of the processed scale line groove and digital identification groove;

[0030] S2.7 The rough workpiece is processed into a dial;

[0031] S3, loosen the three-jaw chuck to remove the base of the adhesive dial in S2;

[0032] S4, placing the base of the adhesive dial in S3 on top of a constant temperature furnace for heating, the heating temperature is set to 100°C to 150°C, the liquid sealing wax will expand when heated, and the dial will be ejected. After the dial is separated from the base, use tweezers to clamp the dial and place it on a heat insulation pad for natural cooling, and a glue layer will remain on the lower end surface of the dial;

[0033] S5. Clean the scale plate in S4:

[0034] The cooled scale is placed in a degumming solvent for soaking and cleaning; the accuracy of the scale is tested using a three-coordinate machine.

[0035] The advantages and positive effects of the present invention are:

[0036] The clamping device of the thin-walled part of the scale plate of the present invention is provided with a sealing wax guide groove on the upper end face of the base, a positioning surface 1 is provided on the outer circumference of the sealing wax guide groove, the sealing wax guide strip is evenly distributed circumferentially at the center of the base, the upper end face of the sealing wax guide strip forms a positioning surface 2, the positioning surface 1 and the positioning surface 2 are used to place the rough workpiece, the sealing wax guide groove is used to place solid sealing wax particles, and the lower end face of the base is provided with a three-claw mounting hole for installing a three-claw chuck. The rough workpiece is clamped by the sealing wax bonding method, which can provide a suitable clamping force when the rough workpiece is processed, which can not only ensure that the rough workpiece is stable and reliable when subjected to cutting force during processing, but also can not produce plastic deformation during the clamping process and after the rough workpiece is disassembled to meet the drawing accuracy requirements.

[0037] The present invention utilizes the processing method of the clamping device of the thin-walled dial to process the blank workpiece to obtain a dial with a graduation line indexing accuracy better than 1', a graduation line width less than 0.2mm, and a graduation line width consistency within 0.01mm, thereby significantly improving the processing accuracy of the dial. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The base structure of the clamping device for the thin-walled part of the scale plate of the present invention is schematically shown. Figure 1 ;

[0039] Figure 2 The base structure of the clamping device for the thin-walled part of the scale plate of the present invention is schematically shown. Figure 2 ;

[0040] Figure 3 This is a schematic diagram of the preparation work before melting the solid sealing paint particles of the present invention;

[0041] Figure 4 It is a schematic diagram of the sealing wax guide groove of the base after the solid sealing wax particles are melted;

[0042] Figure 5 A schematic diagram of the preparation work for positioning and installing a blank workpiece according to the present invention;

[0043] Figure 6 This is a schematic diagram of positioning and installing a blank workpiece according to the present invention;

[0044] Figure 7 This is a schematic diagram of the solidification and shaping of the blank workpiece of the present invention;

[0045] Figure 8 A schematic diagram of the three-claw installation of the base of the bonded rough workpiece on the machine tool according to the present invention;

[0046] Fig. 9 This is a schematic diagram of blank workpiece blanking processing of the present invention;

[0047] Fig.10 This is a schematic diagram of inner hole processing of a blank workpiece according to the present invention;

[0048] Fig.11 This is a schematic diagram of the processing of the scale line groove and the digital identification groove of the present invention;

[0049] Fig.12 It is a schematic diagram of the base of the adhesive scale plate after disassembly of the present invention;

[0050] Fig.13 This is a schematic diagram of the degree plate of the present invention being separated from the base;

[0051] Fig.14 This is a partial enlarged schematic diagram of the scale plate after cleaning of the present invention;

[0052] Fig.15 This is a schematic diagram of the structure of a blank workpiece of the present invention;

[0053] In the figure:

[0054] 1-base, 2-sealing wax guide strip, 3-positioning surface one, 4-sealing wax guide groove, 5-positioning surface two, 6-three-jaw mounting hole, 7-solid sealing wax particles, 8-constant temperature furnace, 9-blank workpiece, 10-clamping weight 10, 11-three-jaw chuck, 12-inner hole, 13-degree dial, 14-scale line groove, 15-digital identification groove. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0056] like Figure 1 , Figure 2 As shown, a clamping device for a thin-walled part of a dial 13 includes a base 1 and a sealing wax guide strip 2. The upper end surface of the base 1 is formed with a sealing wax guide groove 4, and the outer circumference of the sealing wax guide groove 4 is formed with a positioning surface 1 3. The sealing wax guide strip 2 is evenly distributed circumferentially at the center of the base 1, and the upper end surface of the sealing wax guide strip 2 forms a positioning surface 2 5. The positioning surface 1 3 and the positioning surface 2 5 are used to place a rough workpiece 9, the sealing wax guide groove 4 is used to place solid sealing wax particles 7, and the lower end surface of the base 1 is formed with a three-claw mounting hole 6 for mounting a three-claw chuck 11.

[0057] The rough workpiece 9 is clamped by wax bonding, and the base 1 is used to connect the three-jaw chuck 11 on the machine tool and bond the rough workpiece 9. The role of the wax guide groove 4 is to make the liquid wax after the solid wax particles 7 are hot-melted to be evenly distributed on the upper end surface of the base 1 with the largest area, so that the bonding force on the rough workpiece 9 as a whole is large enough and uniform, and it is not easy to deform. The role of the positioning surface 13 of the rough workpiece 9 of the base 1 and the positioning surface 25 formed by the wax guide strip 2 is to make the lower end surface of the rough workpiece 9 fit tightly with the base 1, so that the rough workpiece 9 is flat after bonding with the base 1. When the rough workpiece 9 is processed, it can ensure that the surface of the rough workpiece 9 is parallel to the X\Y axis plane of the machine tool, thereby ensuring the processing accuracy of the rough workpiece 9. The flatness of the positioning surface of the rough workpiece 9 is required to be within 0.002mm.

[0058] The three-jaw mounting hole 6 formed on the lower end face of the base 1 is connected to the three-jaw chuck 11, and the three-jaw chuck 11 is used to support the three-jaw mounting hole 6 of the base 1. The entire bonded rough workpiece 9 is installed together with the base 1 to the three-jaw chuck 11 on the machine tool. The three-jaw mounting hole 6 on the lower end face of the base 1 is the positioning reference. During the processing, in order to ensure that the upper plane of the bonded rough workpiece 9 is parallel to the X\Y plane of the machine tool, the cylindricality of the three-jaw mounting hole 6 is less than 0.005mm, the verticality of the hole axis and the positioning surface of the rough workpiece 9 on the upper end face of the base 1 is less than 0.01mm, and the coaxiality with the outer circle of the base 1 is less than 0.05mm. The lower end face of the base 1 is the plane that contacts the constant temperature furnace 8 when the solid wax particles 7 are heated.

[0059] Working principle of the present invention:

[0060] The base 1 is mounted on a constant temperature furnace 8, and solid sealing wax particles 7 are placed in the center of the sealing wax guide groove 4 on the upper end surface of the base 1. After the solid sealing wax particles 7 are heat-melted in the constant temperature furnace 8, the liquid sealing wax diffuses through the sealing wax guide strip 2 and fills the sealing wax guide groove 4, and the rough workpiece 9 is pushed flat onto the positioning surface 1 3 of the rough workpiece 9 of the base 1 and the positioning surface 2 5 formed by the sealing wax guide strip 2. After the rough workpiece 9 is bonded to the base 1, the rough workpiece 9 and the base 1 are removed from the constant temperature furnace 8, and the base 1 is mounted on a machine tool by a three-jaw chuck 11, and the rough workpiece 9 is processed into a scale 13.

[0061] A processing method using a clamping device for a thin-walled part of a scale plate 13 comprises the following steps:

[0062] S1. Clamping of blank workpiece 9:

[0063] S1.1 Preheating of the base 1 and the solid wax pellets 7:

[0064] like Figure 3 , Figure 4 As shown, the base 1 is installed on the constant temperature furnace 8, and the solid sealing wax particles 7 are placed in the center of the sealing wax guide groove 4 of the base 1;

[0065] Turn on the constant temperature furnace 8, adjust the temperature at 150°C to heat the base 1 and the solid sealing wax particles 7 for 5 minutes, the solid sealing wax particles 7 melt into liquid sealing wax and fill the sealing wax guide groove 4 of the base 1 for diversion, and the liquid sealing wax liquid level is flush with the positioning surface 13 of the base 1 and the positioning surface 25 formed by the upper end surface of the sealing wax guide strip 2; if the liquid sealing wax liquid level does not reach the positioning surface 13 of the base 1 and the positioning surface 25 formed by the upper end surface of the sealing wax guide strip 2, continue to add solid sealing wax particles until the liquid sealing wax liquid level is flush with the positioning surface 13 of the base 1 and the positioning surface 25 formed by the upper end surface of the sealing wax guide strip 2.

[0066] S1.2 Positioning and installation of blank workpiece 9:

[0067] like Figure 5 , Figure 6 As shown, since the constant temperature furnace 8 has a constant temperature function, the preheated base 1 and the temperature of the liquid sealing wax can be maintained at 150°C, and the blank workpiece 9 is installed on the base 1 in a flat push manner, and the lower end surface of the blank workpiece 9 contacts with the positioning surface 1 3 of the base 1 and the upper end surface of the sealing wax guide strip 2 to form a positioning surface 2 5;

[0068] Wear heat-insulating gloves and contact the lower end face of the rough workpiece 9 with the positioning surface 3 of the base 1. In order to accurately position the rough workpiece 9, ensure that the lower end face of the rough workpiece 9 is tightly fitted with the positioning surface 3 of the base 1 and the upper end face of the sealing wax guide strip 2 to form a positioning surface 25 without any sealing wax residue. Install the rough workpiece 9 on the base 1 in a flat push manner. At this time, the center of the rough workpiece 9 coincides with the center of the base 1, and the lower end face of the rough workpiece 9 contacts the upper end face of the base 1, and the positioning and installation of the rough workpiece 9 is completed.

[0069] S1.3 The blank workpiece 9 is solidified and shaped:

[0070] like Figure 7 As shown, after the blank workpiece 9 is positioned and installed on the base 1, the constant temperature furnace 8 must be closed to wait for the liquid sealing wax to cool and solidify. After the liquid sealing wax solidifies, the blank workpiece 9 is firmly bonded to the base 1. However, thermal deformation will occur during the cooling and solidification process of the liquid sealing wax, and the blank workpiece 9 is prone to warping, which may cause the blank workpiece 9 to not be firmly bonded to the base 1. During processing, the blank workpiece 9 will be affected by the cutting force, causing the blank workpiece 9 to detach from the base 1, causing the knife to break, causing a safety accident. In addition, due to the warping of the blank workpiece 9, the plane on the blank workpiece 9 is not parallel to the X\Y axis plane of the machine tool, resulting in a processing error and causing the blank workpiece 9 to be scrapped. In order to avoid the above phenomenon, finalization work must be performed after the installation of the blank workpiece 9.

[0071] After closing the constant temperature furnace 8, a pressing weight 10 is placed on the upper end surface of the blank workpiece 9. The pressing weight 10 is made of lead, and the flatness of the lower end surface of the pressing weight 10 is 0.01mm, which contacts the upper end surface of the blank workpiece 9. Since the contact surface is relatively flat, the pressing weight 10 can be tightly attached to the blank workpiece 9, and the pressure on the blank workpiece 9 will be uniform. During the cooling and solidification process of the liquid sealing wax, the blank workpiece 9 is always attached to the positioning surface 1 3 of the base 1, the upper end surface of the sealing wax guide strip 2 forms the positioning surface 2 5 and the sealing wax adhesive layer. When the liquid sealing wax is completely cooled and solidified, the blank workpiece 9 is firmly bonded and flat, meeting the processing conditions.

[0072] While the liquid sealing wax is cooling and solidifying, the blank workpiece 9, the base 1 and the constant temperature furnace 8 will also be cooled together. When the temperature of the blank workpiece 9, the base 1 and the constant temperature furnace 8 drops to room temperature, the pressing weight 10 can be removed, and the bonded blank workpiece 9 and the base 1 are taken out of the constant temperature furnace 8 together to wait for subsequent processing. At this time, the lower end face of the blank workpiece 9 is closely fitted with the positioning surface 1 3 of the base 1 and the upper end face of the sealing wax guide strip 2 to form the positioning surface 2 5, and the blank workpiece 9 is an aluminum plate of equal thickness, so the work of installing the base 1 on the upper end face of the blank workpiece 9 is completed.

[0073] S1.4 Install the base 1 with the bonded blank workpiece 9 on the machine tool:

[0074] like Figure 8 As shown, a three-jaw chuck 11 is installed on the machine tool bed surface, the three-jaw center is aligned and its X\Y position coordinate value is input into the machine tool coordinate system;

[0075] Install the base 1 with the bonded blank workpiece 9 onto the three-jaw chuck 11, use the outer cylindrical surface of the jaws of the three-jaw chuck 11 to contact the three-jaw mounting hole 6 of the base 1, and move the positive jaw outward until the base 1 with the bonded blank workpiece 9 is locked; the three-jaw chuck 11 has a self-centering function, and the X\Y position coordinate value of the center of the base 1 coincides with the position coordinate value of the three-jaw center, and the position coordinate value is the processing origin of the X\Y plane.

[0076] Among them, the axis of the three-jaw mounting hole 6 of the base 1 and the positioning surface of the base 1 have high precision in verticality, cylindricity and outer circle coaxiality, so after the three-jaw chuck 11 is locked, the positioning surface 3 of the base 1 and the X\Y plane of the machine tool are naturally kept parallel, and the bottom surface of the rough workpiece 9 is tightly attached to the positioning surface 3 of the base 1. The rough workpiece 9 is a thin-walled part of equal thickness, so at this time, the upper end surface of the rough workpiece 9 is also parallel to the X\Y plane of the machine tool. In order to ensure that the upper end surface of the rough workpiece 9 is parallel to the X\Y plane of the machine tool, a lever micrometer is also required to perform a parallelism test. If the test is not parallel, it needs to be reinstalled until the top surface of the rough workpiece 9 is ensured to be parallel to the X\Y plane of the machine tool.

[0077] Since the three-jaw chuck 11 has a self-centering function, the X / Y position coordinate value of the center of the base 1 coincides with the position coordinate value of the three-jaw center, and this position coordinate value is the processing origin of the X / Y plane.

[0078] At this time, the rough workpiece 9 has been installed on the machine tool, and the machining origin of the X\Y plane has been obtained, and the rough workpiece 9 is clamped.

[0079] S2, the rough workpiece 9 is processed into a degree plate 13:

[0080] S2.1 Determine the position coordinates of the blank workpiece 9:

[0081] The position coordinates of the rough workpiece 9 are the position coordinate values ​​of the X\Y\Z axis of the machine tool. S1.4 obtains the machining origin of the X\Y plane, and measures the Z value coordinate of the upper end surface of the rough workpiece 9 through the 3D finder provided by the machine tool;

[0082] S2.2 As Fig. 9 As shown, a φ6 milling cutter is used to process a φ170 mm outer circle, remove residual waste; process the irregular shape of the rough workpiece 9 into a circle and ensure the diameter size required by the drawing. The waste after processing will fall off automatically, while other parts to be processed are still bonded to the base 1. After removing the waste at the edge of the rough workpiece 9, the rigidity of the rough workpiece 9 is more stable in the subsequent processing to ensure processing safety and reliability.

[0083] S2.3 Fig.10 As shown, the φ6 milling cutter is used to process the blank workpiece 9 obtained in S2.2 with a φ70 mm inner hole 12, ensure the coaxiality within 0.01mm; and meet the requirements of the drawing. The waste material of the inner hole 12 after processing will still stick to the base 1.

[0084] S2.4 Use a vernier caliper to check the size of the outer circle and inner hole 12 of the blank workpiece, and use a file to trim the edge burrs to prevent the tool from breaking due to excessive burrs during subsequent processing of the wire groove, and prepare for the subsequent processing of the scale wire groove 14 and the digital identification groove 15.

[0085] S2.5 Fig.11 As shown, a φ0.2 milling cutter is used to process 360 scale line grooves 14 and digital identification grooves 15. The width of the above grooves is all 0.2 mm and the consistency of the groove width is less than 0.01 mm, and meets the requirements of the drawing.

[0086] S2.6 Use 0.19mm, 0.2mm and 0.21mm needle gauges to check the consistency of the width of the processed scale line groove 14 and the digital identification groove 15;

[0087] The depth of the scale groove 14 and the digital identification groove 15 can be milled deeper. Because the bottom of the scale groove 14 and the digital identification groove 15 on the rough workpiece 9 is sealing wax, the sealing wax is soft and will not break the knife. In addition, when processing the scale groove 14, it should be noted that the processing route is from the inside to the outside, which will reduce the vibration generated during processing and improve the processing accuracy. The processed scale groove 14 and the digital identification groove 15 can be tested for the size and consistency of the groove width with 0.19mm, 0.2mm and 0.21mm needle gauges.

[0088] S2.7 The rough workpiece 9 is processed into a degree plate 13;

[0089] Since the scale plate 13 is a thin-walled part, it is easy to deform during processing, and the precision requirement is high. Therefore, a reasonable processing sequence must be determined during processing to ensure the precision requirement. If the processing sequence is wrong, the scale plate 13 will be deformed, debonded, and the blade will break during processing, causing the rough workpiece 9 to be scrapped.

[0090] S3, such as Fig.12 As shown, release the three-jaw chuck 11 to remove the base 1 of the adhesive scale plate 13 in S2.

[0091] S4, such as Fig.13 , Fig.14 As shown, the base 1 to which the degree disc 13 is bonded in S3 is placed above a constant temperature furnace 8 for heating. The heating temperature is set to 150°C. The liquid sealing wax will expand when heated, and the degree disc 13 will be ejected. After the degree disc 13 is separated from the base 1, tweezers are used to clamp the degree disc 13 and place it on an insulating pad for natural cooling. A glue layer remains on the lower end surface of the degree disc 13.

[0092] S5, cleaning the disk 13 in S4:

[0093] like Fig.14 As shown, the cooled scale plate 13 is immersed in anhydrous ethanol or other degumming solvent for cleaning; the accuracy of the scale plate 13 is tested by a three-coordinate machine.

[0094] Sealing wax will dissolve in anhydrous ethanol or other adhesive removal solvents but will not corrode the aluminum plate. After soaking and cleaning the dial 13, ensure that the residual adhesive layer is completely removed, especially the scale groove 14 and the digital identification groove 15. There should be no residual sealing wax glue, otherwise the soaking and cleaning will continue until it is completely cleaned. Then the cleaned dial 13 is tested by a three-coordinate machine for final accuracy testing.

[0095] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A clamping device for thin-walled parts of a measuring plate, characterized in that: It includes a base and a sealing wax guide strip, the upper end surface of the base is formed with a sealing wax guide groove, the outer circumference of the sealing wax guide groove is formed with a positioning surface one, the sealing wax guide strip is evenly distributed in the center of the base, the upper end surface of the sealing wax guide strip forms a positioning surface two, the positioning surface one and the positioning surface two are used to place the blank workpiece, the sealing wax guide groove is used to place solid sealing wax particles, and the lower end surface of the base is formed with a three-claw mounting hole for installing a three-claw chuck.

2. The clamping device for thin-walled parts of a scale according to claim 1, characterized in that: Solid sealing wax particles are placed in the center of the sealing wax guide groove, and the hot-melted solid sealing wax particles are evenly filled in the sealing wax guide groove through the sealing wax guide strips.

3. A processing method using the clamping device for thin-walled scale plate parts according to claim 1, characterized in that: The following steps are involved: S1. Clamping of blank workpiece: S1.1 Preheating of base and solid wax particles: Install the base on the constant temperature furnace, and put the solid sealing wax particles into the center of the sealing wax guide groove of the base; Open the constant temperature furnace, adjust the temperature at 100°C to 150°C, and heat the base and solid sealing wax particles for 3 to 5 minutes. The solid sealing wax particles melt into liquid sealing wax and fill the sealing wax guide groove of the base. The liquid sealing wax liquid level is flush with the positioning surface 1 of the base and the upper end surface of the sealing wax guide strip to form the positioning surface 2. S1.2 Positioning and installation of blank workpiece: The rough workpiece is installed on the base in a horizontal push manner, and the lower end surface of the rough workpiece contacts with the first positioning surface of the base and the upper end surface of the sealing wax guide strip to form the second positioning surface; S1.3 Solidification of the blank workpiece: Close the constant temperature furnace, place a pressing weight on the upper end surface of the blank workpiece, and after the liquid sealing wax cools and solidifies, the blank workpiece is bonded to the base; after the temperature of the blank workpiece, the base and the constant temperature furnace drops to room temperature, remove the pressing weight, and remove the base with the bonded blank workpiece from the constant temperature furnace; S1.4 Install the base of the bonded blank workpiece onto the machine tool: Install the three-jaw chuck on the machine bed, align the center of the three-jaw and input its X\Y position coordinates into the machine coordinate system; Install the base of the bonded rough workpiece onto the three-jaw chuck, use the outer cylindrical surface of the three-jaw chuck jaws to contact the three-jaw mounting hole of the base, and move the positive jaws outward until the base of the bonded rough workpiece is locked; the three-jaw chuck has a self-centering function, and the X\Y position coordinate value of the base circle center coincides with the position coordinate value of the three-jaw center, and the position coordinate value is the processing origin of the X\Y plane; S2. Processing the blank workpiece into a dial: S2.1 Determine the position coordinates of the blank workpiece: The position coordinates of the blank workpiece are the position coordinate values ​​of the X\Y\Z axis of the machine tool. S1.4 obtains the machining origin of the X\Y plane and measures the Z value coordinate of the upper end face of the blank workpiece through the 3D finder provided by the machine tool. S2.2 Use φ6 milling cutter to process the blank workpiece Outer circle, remove residual waste; S2.3 Use φ6 milling cutter to process the blank workpiece obtained in S2.2 inner hole; S2.4 Use a vernier caliper to check the outer diameter and inner hole size of the blank workpiece, and use a file to trim the edge burrs; S2.5 Use φ0.2 milling cutter to process scale line groove and digital identification groove; S2.6 Use 0.19mm, 0.2mm and 0.21mm needle gauges to check the consistency of the groove width of the processed scale line groove and digital identification groove; S2.7 The rough workpiece is processed into a dial; S3, loosen the three-jaw chuck to remove the base of the adhesive dial in S2; S4, placing the base of the adhesive dial in S3 on top of a constant temperature furnace for heating, the heating temperature is set to 100°C to 150°C, the liquid sealing wax will expand when heated, and the dial will be ejected. After the dial is separated from the base, use tweezers to clamp the dial and place it on a heat insulation pad for natural cooling, and a glue layer will remain on the lower end surface of the dial; S5. Clean the scale plate in S4: The cooled scale is placed in a degumming solvent for soaking and cleaning; the accuracy of the scale is tested using a three-coordinate machine.

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