Machining device and method for accurately grinding and polishing surface of metal mirror surface nut part

Abstract

The invention provides a machining device and method for accurate grinding and polishing of the surface of a metal mirror surface nut part, and belongs to the technical field of accurate grinding and polishing machining of metal nut parts. The device at least comprises a double-face accurate grinding and polishing machine provided with a correction wheel, a stud auxiliary tool, a plurality of wandering star wheels and a nut part, the gears are annularly and uniformly distributed between a double-sided fine-grinding polishing machine sun gear main shaft and a double-sided fine-grinding polishing machine outer gear ring of the double-sided fine-grinding polishing machine and are meshed with each other through corresponding gears; the upper end and the lower end of the double-end stud auxiliary tool are both connected with the corresponding nut parts, wax sealing treatment is carried out, and the wax-sealed double-end stud auxiliary tool and the nut parts are integrated and arranged on the wandering star wheel. According to the method, the double-end stud auxiliary tool is designed, and wax sealing is carried out through the double-end stud auxiliary tool and the connected threaded part, so that the bonding stress generated by traditional upper disc machining is avoided, and the on-line measurement result and the disassembly measurement result are the same.

Description

Technical Field

[0001] The invention belongs to the technical field of fine grinding and polishing of metal nut parts, and in particular relates to a processing device and method for fine grinding and polishing the surface of a metal mirror nut part. Background Art

[0002] The materials of metal mirror nut parts (hereinafter referred to as nut parts) are generally aluminum alloy, stainless steel, etc. The upper end surface of the parts belongs to the appearance surface, and sometimes it is necessary to achieve a mirror effect. The mechanical processing method can complete the outline size and meet the requirements of form and position tolerance, but it cannot make the upper end surface of the parts achieve a mirror effect, and it is necessary to use the processing method of optical parts fine grinding and polishing.

[0003] After searching, the announcement number CN105150075A discloses an actuator of a multi-station automatic polishing machine, which is applicable to the technical field of an automatic processing machine. The actuator includes a part to be polished, a part seat that drives the part to be polished to move, a part limiter that fixes the part to be polished on the part seat, a part ejector and a part clamping part. The part seat is fixedly connected to the nut seat, and the part seat is provided with an opening on one side. The part limiter is arranged outside the opening, and the part ejector is arranged inside the part seat. The actuator of a multi-station automatic polishing machine provided by the present invention uses a part seat that can reciprocate to drive the part to be polished to move, so that after the part to be polished completes the polishing of one side, the other side can be automatically polished. At the same time, the part seat can start the polishing process of the next part, so that one production line can obtain parts that have completed the polishing process, which greatly improves production efficiency.

[0004] The upper end face of the traditional fine grinding and polishing mirror nut is processed by the classical method. The classical method requires the use of bonding to mount the disk. During the mounting process, the upper disk of the part will be greatly deformed due to thermal stress, bonding stress, etc. In addition, the normal component of the fine grinding and polishing working pressure at the upper end of the part is uneven and changes with the swing amplitude of the ejector pin. After fine grinding and polishing, the surface accuracy of the part on the disk meets the processing requirements, but after the disk is removed, when various retaining stresses are released, the surface shape of the part changes greatly, resulting in inconsistency between the surface accuracy of the part on the same disk and the parallelism difference between the upper and lower surfaces.

[0005] The use of classical methods to finely grind and polish nut parts also has problems such as high operator skill requirements, low processing efficiency, and complex processes.

[0006] In order to solve the problems of the above-mentioned nut parts in the fine grinding and polishing process and improve the processing quality and efficiency of mirror nuts, it is necessary to find a tooling fixture and processing method suitable for large-scale fine grinding and polishing of nut parts, which will provide important technical reference and basis for the fine grinding and polishing of such parts in the future. Summary of the invention

[0007] In order to overcome the problems of inconsistent surface shape accuracy and upper and lower surface parallelism of the same disc part, low processing efficiency and complicated process in the fine grinding and polishing process of existing nut parts, the present invention provides a processing device and method for fine grinding and polishing of metal mirror nut parts. The present invention avoids the bonding stress generated by traditional upper disc processing by designing a stud auxiliary tooling and wax sealing the stud auxiliary tooling and the connected threaded parts, so that the online measurement and disassembly measurement results are the same. The present invention can fine grind and polish a large number of nut parts at one time, and is suitable for mass processing.

[0008] The technical solution adopted by the present invention is: A processing device for fine grinding and polishing the surface of a metal mirror nut part comprises at least a double-sided fine grinding and polishing machine equipped with a correction wheel, including a stud auxiliary tooling, a planetary wheel and a nut part. The planetary wheels are multiple and evenly distributed in the circumferential direction between the sun gear main shaft and the outer gear ring of the double-sided fine grinding and polishing machine, and meshed with each other through corresponding gears; the upper and lower ends of the stud auxiliary tooling are connected to the corresponding nut part and are wax-sealed. After wax sealing, the stud auxiliary tooling and the nut part are integrated and arranged on the planetary wheel.

[0009] The nut part includes an upper end face of the nut part, an outer surface of the nut part, a lower end face of the nut part, an internal thread of the nut part and a thread back cutter groove of the nut part. The upper end face of the nut part is parallel to the lower end face of the nut part, and the thread back cutter groove of the nut part is arranged at the bottom of the internal thread of the nut part.

[0010] The stud-type stud auxiliary tooling includes a stud-type stud auxiliary block, and the upper and lower ends of the stud-type stud auxiliary block are provided with external threads that cooperate with the corresponding nut parts, and the external threads are provided with thread withdrawal grooves; two upper and lower parallel positioning end faces are provided in the middle of the stud-type stud auxiliary block, and a positioning shaft is provided in the middle of the stud-type stud auxiliary block, and the positioning shaft is gap-matched with the planetary wheel positioning hole in the planetary wheel; the external thread is perpendicular to the positioning end face and coaxial with the positioning shaft.

[0011] The width of the positioning shaft is at least 5mm; the diameter of the positioning shaft is 1-2mm larger than the diameter of the circumscribed circle of the outer surface of the nut part of the nut part; the length of the external thread is 1-2mm shorter than the internal thread of the nut part of the nut part.

[0012] The planetary wheel comprises a planetary wheel center hole, a planetary wheel positioning hole and a planetary wheel outer gear. There are multiple planetary wheel positioning holes evenly arranged on the planetary wheel. The planetary wheel outer gear has the same module and pressure angle as the sun gear spindle of the double-sided fine grinding and polishing machine and the outer gear ring of the double-sided fine grinding and polishing machine.

[0013] The total thickness of the wax-sealed stud auxiliary tooling and the nut parts after being integrated is greater than the thickness of the planetary wheel of the planetary wheel.

[0014] The thickness of the planetary wheel is determined according to the total height of the two nut parts tightened on the two ends of the stud auxiliary tooling. The maximum thickness of the planetary wheel is more than 1 mm lower than the total height of the two nut parts tightened on the two ends of the stud auxiliary tooling. The minimum thickness of the planetary wheel needs to be able to cover the positioning shaft of the stud auxiliary tooling in the planetary wheel.

[0015] A processing method of a processing device for fine grinding and polishing the surface of a metal mirror nut part, the specific steps are: Step 1: Select the fixture. Select and determine the stud auxiliary tooling and planetary wheel according to the internal thread specification, height and external cylindrical surface size of the nut part; Step 2: Install the nut parts on the stud auxiliary tooling and seal with wax; Step 3: Correct the upper and lower polishing discs of the double-sided polishing machine. Before fine grinding and polishing, use the correction wheel configured on the double-sided fine grinding and polishing machine to correct the parallel error of the upper and lower fine grinding and polishing discs; Step 4: Place the nut parts, stud auxiliary tooling and planetary wheel in the double-sided fine grinding and polishing machine. Step 5: Allocate the fine grinding and polishing allowance and process. The machining allowance of the fine grinding process is 0.05-0.08mm, and the machining allowance of the polishing process is 0.02-0.03mm; during the machining process, the planetary wheel performs planetary rotation around the sun wheel spindle and the fixed outer gear ring of the double-sided fine grinding and polishing machine, and the nut parts and the stud auxiliary block tooling perform follow-up movement in the planetary wheel positioning hole of the planetary wheel; Step 6: Disassemble the nut parts. After passing the inspection, the nut parts and stud tooling are taken out and disassembled, the nut parts are sent for inspection, and the stud auxiliary tooling is recycled; Step 7: Inspection Inspect the mirror surface defects, finishing thickness, and parallelism difference of upper and lower end faces of nut parts.

[0016] In the step 2, the specific steps of installing the nut part on the stud auxiliary tooling and sealing with wax are as follows: Step 1: connect two nut parts to two ends of the stud auxiliary tooling through threads, so that the lower end surface of the nut part and the positioning end surface of the stud auxiliary tooling are closely fitted; Step 2: immerse the stud auxiliary tooling and the two nut parts tightened on both ends of the stud auxiliary tooling in melted wax liquid for wax sealing. After solidification, scrape off the excess wax on the upper end surface of the nut part and the surface of the positioning shaft of the stud auxiliary tooling in the planetary wheel.

[0017] In the step four, the specific steps of placing the nut parts, the stud auxiliary tooling and the planetary wheel in the double-sided fine grinding and polishing machine are as follows: five planetary wheels are evenly placed on the circumference of the main shaft and the outer gear ring of the double-sided fine grinding and polishing machine, and mesh with each other through gears, and the nut parts and the stud auxiliary tooling installed with wax sealing in step two are placed in the planetary wheel positioning hole of the planetary wheel.

[0018] Beneficial effects of the present invention: The present invention avoids the bonding stress generated by traditional disk processing by designing a stud-assisted tooling and performing wax sealing on the stud-assisted tooling and the connected threaded parts, so that the online measurement and disassembly measurement results are the same.

[0019] In the present invention, the position accuracy requirements of the positioning end face and the external thread and the two positioning end faces in the stud auxiliary tooling can be fully guaranteed by one-time lathe processing. The double-sided fine grinding and polishing process can ensure the parallelism of the upper and lower end faces of the nut parts, and all the finished parts have good consistency.

[0020] In the present invention, the double-sided fine grinding and polishing machine can process 5 planetary wheels at one time, and one planetary wheel tooling has several positioning holes for placing nut parts and stud auxiliary block tooling, and one stud auxiliary block tooling can clamp 2 nut parts. A large number of nut parts can be finely ground and polished at one time, which is suitable for large-scale processing, and at the same time expands the processing field of double-sided fine grinding and polishing equipment.

[0021] The present invention connects two nut parts through a stud auxiliary tooling, places them in the planetary wheel positioning hole of the planetary wheel after sealing treatment, and finely grinds and polishes the surface of the metal nut parts on a double-sided fine grinding and polishing machine to achieve a mirror effect. By designing stud auxiliary tooling and improving processing methods, the residual stress of the nut parts in the milling and polishing process is eliminated, the parallelism and consistency of the finished parts are guaranteed, and large-scale processing can be carried out to improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the processing of nut parts and stud auxiliary tooling in the planetary wheel of the double-sided fine grinding and polishing machine.

[0023] Figure 2 It is an enlarged schematic diagram of the nut parts and the stud auxiliary tooling in the planetary wheel hole.

[0024] Figure 3It is a schematic diagram of the assembly of nut parts in the stud auxiliary tooling.

[0025] Figure 4 This is a schematic diagram of a planetary wheel.

[0026] Figure 5 It is a schematic diagram of the stud auxiliary tooling.

[0027] Figure 6 It is a schematic diagram of the nut parts.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] In the figure, the reference numerals are: 1. Planetary wheel; 2. Auxiliary tooling for double-ended studs; 3. Nut parts; 4. Sun gear spindle of double-sided fine grinding and polishing machine; 5. External gear ring of double-sided fine grinding and polishing machine; 1-1, center hole of planetary wheel; 1-2, positioning hole of planetary wheel; 1-3, outer gear of planetary wheel; 1-4, thickness of planetary wheel; 2-1, positioning end face; 2-2, external thread; 2-3, thread undercut groove; 2-4, positioning shaft; 3-1. Upper end face of the nut part; 3-2. Outer surface of the nut part; 3-3. Lower end face of the nut part; 3-4. Internal thread of the nut part; 3-5. Thread backing groove of the nut part. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the 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.

[0031] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0032] Embodiment 1: In order to overcome the problems of inconsistent surface shape accuracy and upper and lower surface parallelism of the same disc part, low processing efficiency and complicated process in the fine grinding and polishing process of the existing nut parts, the present invention provides a Figure 1-Figure 6The device and method for fine grinding and polishing the surface of a metal mirror nut part shown in the figure avoid the bonding stress generated by traditional disk processing by designing a stud auxiliary tooling and wax sealing the stud auxiliary tooling and the connected threaded parts, so that the online measurement and disassembly measurement results are the same. The present invention can fine grind and polish a large number of nut parts at one time, and is suitable for mass processing.

[0033] A processing device for fine grinding and polishing the surface of a metal mirror nut part, at least includes a double-sided fine grinding and polishing machine equipped with a correction wheel, including a stud auxiliary tooling 2, a planetary wheel 1 and a nut part 3, wherein the planetary wheels 1 are multiple and evenly distributed in the circumferential direction between the sun gear main shaft 4 and the outer gear ring 5 of the double-sided fine grinding and polishing machine, and mesh with each other through corresponding gears; the upper and lower ends of the stud auxiliary tooling 2 are connected to the corresponding nut part 3 and are wax-sealed, and the stud auxiliary tooling 2 and the nut part 3 after wax sealing are integrated and arranged on the planetary wheel 1.

[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in the present invention, the planetary wheel 1 can be evenly placed in the middle of the double-sided fine grinding and polishing machine sun gear main shaft 4 and the double-sided fine grinding and polishing machine outer gear ring 5 in five pieces at a time, and meshed with each other through gears. The stud auxiliary tooling 2 is fixed by thread, and the end plane is positioned in a way that a metal mirror nut part 3 is connected to each of the upper and lower ends, and wax sealing is performed. The wax-sealed stud auxiliary tooling 2 and the nut part 3 are placed together in the planetary wheel positioning hole 1-2 of the planetary wheel 1.

[0035] The present invention uses a correction wheel configured with a double-sided fine grinding and polishing machine to correct the parallel error of the upper and lower fine grinding and polishing discs before fine grinding and polishing. Five planetary wheels 1 are evenly placed on the circumference of the sun gear main shaft 4 of the double-sided fine grinding and polishing machine and the outer gear ring 5 of the double-sided fine grinding and polishing machine, and the planetary wheels 1 are meshed with the sun gear main shaft 4 of the double-sided fine grinding and polishing machine and the outer gear ring 5 of the double-sided fine grinding and polishing machine through gears. The nut part 3 that has completed the mechanical processing process is tightened on the upper and lower stud surfaces of the stud auxiliary tooling 2 and positioned through the end face, and then the stud auxiliary tooling 2 with the nut part 3 is immersed in melted wax liquid for wax sealing, and the excess wax is scraped off after it solidifies to prevent water vapor from entering during the subsequent fine grinding and affecting its accuracy. Finally, the nut part 3 and the stud auxiliary tooling 2 are placed in the planetary wheel positioning hole 1-2 of the planetary wheel 1. During the machining process, the planetary wheel 1 performs planetary rotation around the sun gear main shaft 4 of the double-sided fine grinding and polishing machine and the fixed outer gear ring 5 of the double-sided fine grinding and polishing machine, and the nut part 3 and the stud auxiliary tooling 2 perform follow-up rotation in the planetary wheel positioning hole 1-2 of the planetary wheel 1. The machining allowance of the fine grinding process is 0.05-0.08mm, and the machining allowance of the polishing process is 0.02-0.03mm.

[0036] The correction wheel of the double-sided fine grinding and polishing machine of the present invention has the function of fine grinding and polishing parts on the upper and lower surfaces at the same time. The present invention can fine grind and polish a large number of nut parts 3 at one time, is suitable for large-scale processing, and expands the processing field of double-sided fine grinding and polishing equipment.

[0037] The present invention connects two nut parts 3 through a stud auxiliary tooling 2, places them in the planetary wheel positioning hole 1-2 of the planetary wheel 1 after sealing treatment, and finely grinds and polishes the surface of the metal nut part 3 on a double-sided fine grinding and polishing machine to achieve a mirror effect.

[0038] The present invention eliminates the residual stress of the nut part 3 during the milling and polishing process by designing the stud auxiliary tooling 2 and improving the processing method, thereby ensuring the parallelism and consistency of the finished parts, and can process in large quantities to improve production efficiency.

[0039] Embodiment 2: Based on Example 1, in this embodiment, preferably, the nut part 3 includes an upper end face 3-1 of the nut part, an outer surface 3-2 of the nut part, a lower end face 3-3 of the nut part, an internal thread 3-4 of the nut part and a thread backlash groove 3-5 of the nut part, the upper end face 3-1 of the nut part is parallel to the lower end face 3-3 of the nut part, and the thread backlash groove 3-5 of the nut part is arranged at the bottom of the internal thread 3-4 of the nut part.

[0040] like Figure 2 and Figure 6As shown, in the present invention, the upper end surface 3-1 of the nut part needs to be finely ground and polished. The nut part 3 has a nut part internal thread 3-4 and a nut part thread backing groove 3-5 at the internal thread. The lower end surface 3-3 of the nut part is parallel to the upper end surface 3-1 of the nut part. The outer surface 3-2 of the nut part is larger than the internal thread 3-4 of the nut part to ensure the strength of the part. Figure 6 It is a schematic diagram of the structure of the nut part 3 and the CC structure. The upper end surface 3-1 of the nut part is a surface that needs to be finely ground and polished, and the lower end surface 3-3 of the nut part is a positioning surface.

[0041] Preferably, the stud-assisted tooling 2 comprises a stud-assisted block, and both upper and lower ends of the stud-assisted block are provided with external threads 2-2 that cooperate with the corresponding nut parts 3, and the external threads 2-2 are provided with thread withdrawal grooves 2-3; two upper and lower parallel positioning end faces 2-1 are provided in the middle of the stud-assisted block, and a positioning shaft 2-4 is provided in the middle of the stud-assisted block, and the positioning shaft 2-4 is clearance-matched with the planetary wheel positioning hole 1-2 in the planetary wheel 1; the external thread 2-2 is perpendicular to the positioning end face 2-1 and coaxial with the positioning shaft 2-4; the positioning end face 2-1 is perpendicular to the positioning shaft 2-4.

[0042] Preferably, the width of the positioning shaft 2-4 is at least 5 mm; the diameter of the positioning shaft 2-4 is 1 to 2 mm larger than the diameter of the circumscribed circle of the nut part outer surface 3-2 of the nut part 3; the length of the external thread 2-2 is 1 to 2 mm shorter than the internal thread 3-4 of the nut part 3.

[0043] like Figure 5 As shown, in the present invention, the material of the stud-type stud auxiliary tooling 2 is preferably made of lightweight materials such as duralumin, nylon, and POM. The stud-type stud auxiliary tooling 2 includes a positioning end face 2-1 of the nut part 3 in the stud-type stud auxiliary tooling 2, an external thread 2-2 and a thread backing groove 2-3 connected to the nut part 3, and a positioning shaft 2-4 of the tooling in the planetary wheel 1. The external thread 2-2 in the stud-type stud auxiliary tooling 2 has the same specifications as the internal thread 3-4 of the nut part 3, and the tolerance zone is 6g. The length of the external thread 2-2 is 1 to 2 mm shorter than the internal thread 3-4 of the nut part. The external thread 2-2 is perpendicular to the positioning end face 2-1 and coaxial with the positioning shaft 2-4; the positioning end face 2-1 is perpendicular to the positioning shaft 2-4. In the present invention, the diameter of the positioning shaft 2-4 is 1 to 2 mm larger than the diameter of the circumscribed circle of the outer surface 3-2 of the nut part 3, the width of the positioning shaft 2-4 is more than 5 mm, and the tolerance zone is 7f. As shown in FIG. Figure 5 It is a front view of the stud auxiliary tooling 2 and a schematic diagram of the BB structure.

[0044] Preferably, the planetary wheel 1 includes a planetary wheel center hole 1-1, a planetary wheel positioning hole 1-2 and a planetary wheel outer gear 1-3, and the planetary wheel positioning holes 1-2 are multiple and evenly arranged on the planetary wheel 1; the planetary wheel outer gear 1-3 has the same module and pressure angle as the double-sided fine grinding and polishing machine sun gear spindle 4 and the double-sided fine grinding and polishing machine outer gear ring 5.

[0045] Preferably, the total thickness of the wax-sealed stud auxiliary tooling 2 and the nut part 3 after being integrated into one is greater than the planetary wheel thickness 1-4 of the planetary wheel 1.

[0046] Preferably, the planetary wheel thickness 1-4 of the planetary wheel 1 is determined according to the total height of the two nut parts 3 tightened on the two ends of the stud auxiliary tooling 2. The maximum planetary wheel thickness 1-4 is at least 1 mm lower than the total height of the two nut parts 3 tightened on the two ends of the stud auxiliary tooling 2. The minimum planetary wheel thickness 1-4 needs to be able to cover the positioning shaft 2-4 of the stud auxiliary tooling 2 in the planetary wheel 1.

[0047] like Figure 1 and Figure 4 As shown, in the present invention, the planetary wheel 1 is made of epoxy plate, and the center hole 1-1 of the planetary wheel plays a role in reducing weight. The planetary wheel positioning hole 1-2 and the positioning shaft 2-4 of the stud auxiliary tooling 2 in the planetary wheel 1 have the same diameter, and adopt H8 / f7 clearance fit. The planetary wheel positioning hole 1-2 is evenly arranged on the planetary wheel 1. The planetary wheel outer gear 1-3 has the same module, pressure angle and other dimensions as the sun gear main shaft 4 of the double-sided fine grinding and polishing machine and the outer gear ring 5 of the double-sided fine grinding and polishing machine, which are inherent parameters of the processing equipment, and are meshed with each other through gears. Generally, 5 planetary wheels can be processed at the same time. The thickness 1-4 of the planetary wheel is designed according to the total height of the two nut parts 3 tightened at the two ends of the stud auxiliary tooling 2. The maximum is at least 1mm lower than the total height of the two nut parts 3 tightened at the two ends of the stud auxiliary tooling 2, and the minimum should be able to cover the positioning shaft 2-4 of the stud auxiliary tooling 2 in the planetary wheel 1. As shown Figure 4 It is a schematic diagram of the main view of the planetary wheel 1 and a schematic diagram of the AA structure.

[0048] In the present invention, the planetary wheel 1 meshes with the sun gear main shaft 4 of the double-sided fine grinding and polishing machine and the outer gear ring 5 of the double-sided fine grinding and polishing machine, and its gear module and pitch circle diameter are fixed values. Generally, 5 planetary wheels 1 can be placed at the same time. Under the premise of ensuring the structural strength of the planetary wheel 1, the planetary wheel positioning holes 1-2 are evenly arranged in the planetary wheel, and the planetary wheel positioning holes 1-2 and the positioning shaft 2-4 of the stud auxiliary tooling 2 adopt H8 / f7 clearance fit. The thickness of the planetary wheel 1 is smaller than the total thickness of the stud auxiliary block, ensuring that the nut part 3 is always in contact with the double-sided fine grinding and polishing machine.

[0049] In the present invention, the double-sided fine grinding and polishing machine can process five planetary wheels 1 at a time, and a plurality of planetary wheel positioning holes 1-2 in one planetary wheel are used to place nut parts 3 and stud auxiliary fixtures 2, and one stud auxiliary fixture 2 can clamp two nut parts 3. A large number of nut parts 3 can be finely ground and polished at one time, which is suitable for large-scale processing, and at the same time expands the processing field of double-sided fine grinding and polishing equipment.

[0050] Embodiment 3; Based on Example 1 or 2, this embodiment preferably provides a method for fine grinding and polishing the surface of a metal nut part, and the specific steps are: Step 1: Select the fixture. According to the internal thread specification, height and outer cylindrical surface size of the nut part 3, the stud auxiliary tooling 2 and the planetary wheel 1 are selected and determined; Step 2: Install the nut part 3 on the stud auxiliary tooling 2 and seal it with wax; Step 3: Correct the upper and lower polishing discs of the double-sided polishing machine. Before fine grinding and polishing, use the correction wheel configured on the double-sided fine grinding and polishing machine to correct the parallel error of the upper and lower fine grinding and polishing discs; Step 4: Place the nut part 3, the stud auxiliary tooling 2 and the planetary wheel 1 in a double-sided fine grinding and polishing machine. Step 5: Allocate the fine grinding and polishing allowance and process. The machining allowance of the fine grinding process is 0.05-0.08mm, and the machining allowance of the polishing process is 0.02-0.03mm; during the machining process, the planetary wheel 1 performs planetary rotation around the sun wheel main shaft 4 and the fixed outer gear ring 5 of the double-sided fine grinding and polishing machine, and the nut part 3 and the stud auxiliary block tooling 2 perform follow-up movement in the planetary wheel positioning hole 1-2 of the planetary wheel 1; Step 6: Disassemble the nut parts. After passing the inspection, the nut part 3 and the stud fixture 2 are taken out and disassembled, the nut part 3 is sent for inspection, and the stud auxiliary fixture 2 is recycled; Step 7: Inspection Inspect the nut parts for 3 mirror surface defects, finished thickness, and parallelism differences of the upper and lower end faces.

[0051] Preferably, in the step 2, the specific steps of installing the nut part 3 on the stud auxiliary tooling 2 and sealing with wax are: Step 1: connect two nut parts 3 to the two ends of the stud auxiliary tooling 2 through threads, so that the nut part lower end surface 3-3 of the nut part 3 is tightly fitted with the positioning end surface 2-1 of the stud auxiliary tooling 2; Step 2, immerse the stud auxiliary tooling 2 and the two nut parts 3 tightened on the two ends of the stud auxiliary tooling 2 in melted wax liquid for wax sealing. After solidification, scrape off the excess wax on the upper end surface 3-1 of the nut part 3 and the surface of the positioning shaft 2-4 of the stud auxiliary tooling 2 in the planetary wheel.

[0052] In the present invention, the stud auxiliary tooling 2 and the two nut parts 3 screwed on the two ends are immersed in melted wax liquid for wax sealing, so as to prevent water vapor from entering during the subsequent fine grinding and affecting its accuracy.

[0053] Preferably, in the step four, the specific steps of placing the nut part 3, the stud auxiliary tooling 2 and the planetary wheel 1 in the double-sided fine grinding and polishing machine are as follows: five planetary wheels 1 are evenly placed on the circumference of the main shaft 4 and the outer gear ring 5 of the double-sided fine grinding and polishing machine, and mesh with each other through gears, and the nut part 3 and the stud auxiliary tooling 2 installed with wax sealing in step two are placed in the planetary wheel positioning hole 1-2 of the planetary wheel 1.

[0054] When the present invention processes the nut parts on the double-sided fine grinding and polishing machine, the correction wheel configured by the double-sided fine grinding and polishing machine is first used to correct the parallel error of the upper and lower fine grinding and polishing discs. Then, five planetary wheels 1 are evenly placed in the double-sided fine grinding and polishing machine, and the stud auxiliary tooling 2 and the nut parts 3 are placed together in the planetary wheel positioning holes 1-2 in the planetary wheel 1. The nut parts 3 are finely ground and polished on the double-sided fine grinding and polishing machine, and the machining allowance of the fine grinding process is 0.05-0.08mm, and the machining allowance of the polishing process is 0.02-0.03mm. The processing method is the same as the fine grinding and polishing of optical parts. After passing the inspection, the parts and tooling are taken out and disassembled, and the parts and tooling are cleaned with gasoline; the nut parts 3 are sent for inspection, and the stud auxiliary tooling 2 can be recycled.

[0055] In the present invention, the position accuracy requirements of the positioning end face 2-1 and the clamped external thread 2-2 and the two positioning end faces 2-1 in the stud auxiliary tooling 2 can be fully guaranteed by one-time lathe processing. The double-sided fine grinding and polishing process can ensure the parallelism of the upper and lower end faces of the nut part 3, and all finished parts have good consistency. By connecting the threaded parts 3 at both ends of the stud auxiliary tooling 2 and wax sealing, the bonding stress generated by the traditional upper plate processing is avoided, so that the online measurement and disassembly measurement results are the same.

[0056] The processing technology and processing device provided by the present invention have been successfully used on the company's double-sided fine grinding and polishing machine with good results. This method can be applied to the fine grinding and polishing of the upper end faces of all metal mirror nut parts, and can be extended to other types of fine grinding and polishing processes with internal threads and perpendicular to the external plane of the internal threads.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0059] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design that is the same or similar to the present invention belongs to the protection scope of the present invention. The device structures and method steps not described in detail in the present invention are all prior art and will not be further described in the present invention.

Claims

1. A processing device for fine grinding and polishing the surface of a metal mirror nut part, comprising at least a double-sided fine grinding and polishing machine equipped with a correction wheel, characterized in that: The invention comprises a stud auxiliary tooling (2), a planetary wheel (1) and a nut part (3). The planetary wheels (1) are multiple and evenly distributed in the circumferential direction between a sun gear main shaft (4) of a double-sided fine grinding and polishing machine and an outer gear ring (5) of the double-sided fine grinding and polishing machine, and mesh with each other through corresponding gears. The upper and lower ends of the stud auxiliary tooling (2) are connected to the corresponding nut part (3) and wax-sealed. After wax sealing, the stud auxiliary tooling (2) and the nut part (3) are integrated and arranged on the planetary wheel (1).

2. The device for fine grinding and polishing the surface of a metal mirror nut part according to claim 1, characterized in that: The nut part (3) comprises an upper end face (3-1) of the nut part, an outer surface (3-2) of the nut part, a lower end face (3-3) of the nut part, an internal thread (3-4) of the nut part and a thread backing groove (3-5) of the nut part. The upper end face (3-1) of the nut part is parallel to the lower end face (3-3) of the nut part, and the thread backing groove (3-5) of the nut part is arranged at the bottom of the internal thread (3-4) of the nut part.

3. The device for fine grinding and polishing the surface of a metal mirror nut part according to claim 1, characterized in that: The stud-type stud auxiliary tooling (2) comprises a stud-type stud auxiliary block, wherein the stud-type stud auxiliary block is provided with external threads (2-2) at both upper and lower ends thereof and matched with the corresponding nut parts (3), and the external threads (2-2) are provided with thread backing grooves (2-3); the stud-type stud auxiliary block is provided with two upper and lower parallel positioning end faces (2-1) in the middle thereof, and the stud-type stud auxiliary block is provided with a positioning shaft (2-4) in the middle thereof, and the positioning shaft (2-4) is clearance-matched with the planetary wheel positioning hole (1-2) in the planetary wheel (1); the external threads (2-2) are perpendicular to the positioning end faces (2-1) and are coaxial with the positioning shaft (2-4).

4. The device for fine grinding and polishing the surface of a metal mirror nut part according to claim 3, characterized in that: The width of the positioning shaft (2-4) is at least 5 mm; the diameter of the positioning shaft (2-4) is 1 to 2 mm larger than the diameter of the circumscribed circle of the nut part outer surface (3-2) of the nut part (3); and the length of the external thread (2-2) is 1 to 2 mm shorter than the internal thread (3-4) of the nut part (3).

5. The device for fine grinding and polishing the surface of a metal mirror nut part according to claim 1, characterized in that: The planetary wheel (1) comprises a planetary wheel center hole (1-1), a planetary wheel positioning hole (1-2) and a planetary wheel outer gear (1-3); the planetary wheel positioning holes (1-2) are multiple and evenly arranged on the planetary wheel (1); the planetary wheel outer gear (1-3) has the same module and pressure angle as the sun gear main shaft (4) of the double-sided fine grinding and polishing machine and the outer gear ring (5) of the double-sided fine grinding and polishing machine.

6. The device for fine grinding and polishing the surface of a metal mirror nut part according to claim 1, characterized in that: The total thickness of the wax-sealed stud auxiliary tooling (2) and the nut part (3) after being integrated is greater than the planetary wheel thickness (1-4) of the planetary wheel (1).

7. The device for fine grinding and polishing the surface of a metal mirror nut part according to claim 1, characterized in that: The planetary wheel thickness (1-4) of the planetary wheel (1) is determined according to the total height of the two nut parts (3) screwed on the two ends of the stud auxiliary tooling (2). The maximum planetary wheel thickness (1-4) is at least 1 mm lower than the total height of the two nut parts (3) screwed on the two ends of the stud auxiliary tooling (2). The minimum planetary wheel thickness (1-4) needs to be able to cover the positioning shaft (2-4) of the stud auxiliary tooling (2) in the planetary wheel (1).

8. A processing method for a surface finishing and polishing device for a metal mirror nut part according to any one of claims 1 to 7, characterized in that: The specific steps are: Step 1: Select the fixture. The stud auxiliary tooling (2) and the planetary wheel (1) are selected and determined according to the internal thread specification, height, and external cylindrical surface size of the nut part (3); Step 2: Install the nut part (3) on the stud auxiliary tooling (2) and seal it with wax; Step 3: Correct the upper and lower polishing discs of the double-sided polishing machine. Before fine grinding and polishing, use the correction wheel configured on the double-sided fine grinding and polishing machine to correct the parallel error of the upper and lower fine grinding and polishing discs; Step 4: Place the nut part (3), the stud auxiliary tooling (2) and the planetary wheel (1) in a double-sided fine grinding and polishing machine. Step 5: Allocate the fine grinding and polishing allowance and process. The machining allowance of the fine grinding process is 0.05-0.08 mm, and the machining allowance of the polishing process is 0.02-0.03 mm. During the machining process, the planetary wheel (1) performs planetary rotation around the sun wheel main shaft (4) and the fixed outer gear ring (5) of the double-sided fine grinding and polishing machine, and the nut part (3) and the stud auxiliary block tooling (2) perform follow-up movement in the planetary wheel positioning hole (1-2) of the planetary wheel (1); Step 6: Disassemble the nut parts. After passing the inspection, the nut part (3) and the stud bolt tooling (2) are taken out and disassembled, the nut part (3) is sent for inspection, and the stud bolt auxiliary tooling (2) is recycled; Step 7: Inspection Inspect the nut parts (3) for mirror surface defects, finished thickness, and parallelism differences between the upper and lower end faces.

9. The method for fine grinding and polishing the surface of a metal mirror nut part according to claim 8, characterized in that: In the step 2, the specific steps of installing the nut part (3) on the stud auxiliary tooling (2) and sealing with wax are as follows: Step 1, connecting two nut parts (3) to two ends of the stud auxiliary tooling (2) by means of threads, so that the nut part lower end surface (3-3) of the nut part (3) is closely fitted with the positioning end surface (2-1) of the stud auxiliary tooling (2); In step 2, the stud auxiliary tooling (2) and two nut parts (3) screwed on both ends of the stud auxiliary tooling (2) are immersed in melted wax liquid for wax sealing. After solidification, the excess wax on the nut part upper end surface (3-1) of the nut part (3) and the surface of the positioning shaft (2-4) of the stud auxiliary tooling (2) in the planetary wheel is scraped off.

10. The method for fine grinding and polishing the surface of a metal mirror nut part according to claim 8, characterized in that: In the step 4, the specific steps of placing the nut parts (3), the stud auxiliary tooling (2) and the planetary wheel (1) in the double-sided fine grinding and polishing machine are as follows: five planetary wheels (1) are evenly placed on the circumference of the main shaft (4) and the outer gear ring (5) of the double-sided fine grinding and polishing machine, and mesh with each other through gears, and the nut parts (3) and the stud auxiliary tooling (2) installed with wax sealing in step 2 are placed in the planetary wheel positioning hole (1-2) of the planetary wheel (1).

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