Method for processing a symmetry gauge

Abstract

This invention belongs to the field of machining and relates to a machining method for symmetrical gauges. The non-through groove on the gauge body shaft is replaced with a through square groove. The working circle and outer circle of the shank of the gauge body shaft are precision ground, and the square groove on the main shaft is precision machined using precision wire cutting. The working circle and square groove of the gauge body shaft are then ground. A rectangular key is machined into a hexagonal structure. The rectangular key is ground to the actual dimensions of the square groove, and the four working surfaces of the rectangular key are ground. A sodium chloride solution is applied to the four working surfaces of the rectangular key, and the rectangular key is assembled into the square groove of the gauge body shaft until the rectangular key and the gauge body shaft are firmly connected. The top hole of the gauge body shaft is polished, and the working surface of the rectangular key is ground on a spline grinder. The outer circle of the connection between the main shaft and the rectangular key is locally ground. This invention reduces the machining difficulty of the gauge body shaft and the rectangular key, improves assembly accuracy, avoids the problem of adhesive detachment, reduces machining and assembly difficulty, and improves the machining efficiency of symmetrical gauges.

Description

Technical Field

[0001] This invention belongs to the field of machining and relates to a machining method for symmetrical gauges. Background Technology

[0002] A symmetric gauge is a precision position gauge, and its basic structure is as follows: Figure 1a and Figure 1b As shown, the gauge consists of a gauge body shaft and a rectangular key. The rectangular key is raised on one side and has precise dimensions and high symmetry requirements relative to the shaft. The gauge body shaft, which is engaged with the rectangular key, also has high dimensional accuracy and cylindricity requirements. The gauge is made of high-hardness tool steel, such as HRC58-65 steel.

[0003] There are two main processing approaches for this type of gauge. One is integral machining, where the rectangular key and gauge body are treated as a single part, and the contours of the gauge body shaft and rectangular key are machined in one step using precision wire EDM. The problem with this method is that the equipment precision is insufficient to meet the dimensional tolerances and other technical requirements of the gauge body shaft's outer diameter, resulting in a high scrap rate and oxide scale on the working surface that fails to meet surface roughness requirements. The other approach is assembly machining, where the gauge body shaft with keyways is machined first, then the rectangular key, with machining allowance, is assembled onto the gauge body. Finally, the working surface of the rectangular key is precision machined to meet the overall drawing requirements.

[0004] Regarding the machining of shafts, US5185917A discloses a method for machining a shaft keyway, but this method uses a milling process, which makes it difficult to guarantee the width and symmetry of the keyway.

[0005] In terms of assembly technology, two main methods are employed: mechanical assembly and adhesive bonding. Mechanical assembly primarily refers to using screws or pins to fasten rectangular keys, such as... Figure 2a and Figure 2bAs shown. The main problem with this process is that when installing the pin, the high hardness of the gauge requires electrical discharge machining (EDM). However, machining and assembling the pin will damage the integrity of the gauge body's working surface and cause deformation. When using screw connections, firstly, the machining is difficult because the rectangular key surface needs to have high precision with the two threaded holes to avoid assembly position deviations. However, due to the limited precision of the internal threads, the size and positional accuracy of the rectangular key surface relative to the two threaded holes are difficult to control. Secondly, the rectangular key needs to be pressed against the gauge body shaft. When both parts are of high hardness, hard pressing will cause deformation of the gauge's outer diameter. Therefore, mechanical connections will result in a high scrap rate for gauge products. The other adhesive assembly process is relatively easier to machine. The gauge structure is mostly based on a modified screw connection structure, i.e., the threaded holes are not machined, and the rectangular key is connected to the gauge body shaft using strong adhesive. This process has problems such as the adhesive bonding area being too small for some gauges, resulting in weak adhesion and deformation. At the same time, as the glue hardens after a period of time, the bonding strength weakens. Especially under certain harsh usage conditions, the rectangular keys of gauges that are only bonded by glue are prone to falling off.

[0006] In summary, existing processing methods for symmetrical gauges suffer from the problems of high processing difficulty and difficulty in ensuring the accuracy of symmetrical gauges during assembly. The use of glue for connection also presents the problem of glue detachment. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the present invention aims to provide a machining method for symmetrical gauges. The present invention reduces the machining difficulty of the gauge body shaft and rectangular key, improves the assembly accuracy, and avoids the problem of adhesive detachment.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] This invention discloses a method for processing a symmetrical gauge, comprising the following steps:

[0010] Change the non-through groove on the gauge body axis to a through square groove;

[0011] The working circle and outer circle of the shank of the gauge body shaft are precision ground, the square groove on the main shaft is precision machined by precision wire cutting, and the working circle and square groove of the gauge body shaft are ground.

[0012] The rectangular key is machined into a hexagonal structure;

[0013] Grind the rectangular key according to the actual size of the square groove, and grind the four working surfaces of the rectangular key;

[0014] Apply sodium chloride solution to the four working surfaces of the rectangular key, and assemble the rectangular key into the square groove of the gauge shaft until the rectangular key and the gauge shaft are firmly connected.

[0015] The top hole of the polishing gauge shaft is used to grind the working surface of the rectangular key on a spline grinding machine;

[0016] The outer circle of the connection between the main shaft and the rectangular key is locally ground.

[0017] Furthermore, the specific process of changing the non-through groove on the gauge shaft into a through square groove is as follows:

[0018] The working circle and shank of the gauge shaft are rough ground to achieve a cylindricity and runout accuracy of less than 0.01 mm.

[0019] Make a wire-passing hole smaller than the width of the square groove in the shaft, and cut the square groove with a wire cutting machine, so that each side of the square groove retains a machining allowance of at least 0.3mm, and the symmetry of the square groove relative to the working circle of the shaft is within 0.02mm.

[0020] The gauge shaft with the square groove machined is subjected to quenching and aging heat treatment.

[0021] Furthermore, the working circle and outer circle of the shank of the gauge body shaft are precision ground, and the square groove on the main shaft is precision machined using precision wire cutting. The specific process of grinding the working circle and square groove of the gauge body shaft is as follows:

[0022] The working circle of the gauge shaft is precision ground, leaving a margin of 0.004mm-0.007mm. The outer circle of the shank is precision ground to ensure that the runout of the outer circle of the shank is within 0.005mm.

[0023] The square groove on the main shaft is precision machined using wire cutting. The working dimension of the square groove is 0.1mm-0.12mm larger than the overall drawing dimension, and the square groove is 0.01mm parallel and perpendicular to the working outer circle of the gauge body.

[0024] The working circle of the gauge shaft is ground to ensure that the dimensional tolerance and cylindricity of the working circle are within 0.002mm;

[0025] The square groove of the gauge shaft is ground to ensure that the parallelism, perpendicularity and symmetry of the square groove are within 0.005mm. The oxide scale on the surface of the square groove must be removed.

[0026] Furthermore, the working circle and center hole of the gauge shaft must be treated with rust prevention.

[0027] Furthermore, the specific process for machining the rectangular key into a hexagonal structure is as follows:

[0028] The rectangular key is machined as a hexagonal structure, with a machining allowance of 0.2mm-0.3mm on the working surface;

[0029] The machined rectangular keys are then subjected to quenching and aging heat treatment.

[0030] Furthermore, the rectangular key is ground according to the actual dimensions of the square groove. The specific process for grinding the four working surfaces of the rectangular key is as follows:

[0031] Grind the rectangular key according to the actual dimensions of the square groove, leaving a working dimension of 0.005mm-0.01mm for the rectangular key;

[0032] The four working surfaces of the rectangular key are ground, and the assembly gap between the four working surfaces of the rectangular key and the four sides of the square groove is no more than 0.005mm, so that the rectangular key can slide in the square groove only under stress.

[0033] Furthermore, a sodium chloride solution is applied to the four working surfaces of the rectangular key, and the rectangular key is then assembled into the square groove of the gauge shaft until the rectangular key and the gauge shaft are firmly connected. The specific process is as follows:

[0034] Apply sodium chloride solution to the four working surfaces of the rectangular key, and then immediately assemble the rectangular key into the square groove of the gauge shaft;

[0035] Place the rectangular key and gauge shaft together in a room temperature environment with humidity greater than 60% for more than 24 hours until the rectangular key and gauge shaft are firmly connected due to oxidation.

[0036] Furthermore, when grinding the working surface of a rectangular key on a spline grinding machine, the working surfaces at both ends of the rectangular key are ground alternately. If the grinding process of equipment such as spline grinding cannot meet the size and positional requirements of the working surface of the rectangular key, an appropriate grinding allowance is left before further processing by grinding.

[0037] Furthermore, the specific process of locally grinding the outer circle of the connection between the main shaft and the rectangular key is as follows:

[0038] Use a special large-aperture grinding bushing to locally grind the outer circle of the connection between the main shaft and the rectangular key.

[0039] Furthermore, the opening size of the polishing sleeve should be 5mm to 8mm larger than the width of the rectangular key, and the polishing paste should be made of cast iron material with a hardness of HB180 or less.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] This invention replaces the non-through groove on the gauge shaft with a through square groove. The working circle and outer circle of the shank of the gauge shaft are precision ground, and the square groove on the main shaft is precision machined using wire cutting. The working circle and square groove of the gauge shaft are then ground. A rectangular key is machined into a hexagonal structure. The rectangular key is ground to fit the actual dimensions of the square groove, and the four working surfaces of the rectangular key are ground. A sodium chloride solution is applied to the four working surfaces of the rectangular key, and the rectangular key is assembled into the square groove of the gauge shaft until the rectangular key and the gauge shaft are firmly connected. The top hole of the gauge shaft is polished, and the working surface of the rectangular key is ground on a spline grinder. The outer circle of the connection between the main shaft and the rectangular key is locally ground. This invention reduces the machining difficulty of the gauge shaft and rectangular key, improves assembly accuracy, improves the deformation of the gauge shaft and the detachment of the rectangular key, avoids the problem of adhesive detachment, reduces machining and assembly difficulty, and improves the machining efficiency of symmetrical gauges. Attached Figure Description

[0042] Figure 1a for Figure 1b AA section view;

[0043] Figure 1b This is a schematic diagram of a symmetrical metric gauge structure;

[0044] Figure 2a A sectional view showing the symmetrical measurement of a mechanical assembly.

[0045] Figure 2b A schematic diagram of a symmetrical measurement gauge for mechanical assembly;

[0046] Figure 3 Structural diagram of a grinding sleeve used for fixed-stroke grinding;

[0047] Figure 4 This is a flowchart of the method of the present invention.

[0048] Among them: 1. gauge shaft; 2. rectangular key; 3. grinding sleeve. Detailed Implementation

[0049] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] The present invention will now be described in further detail with reference to the accompanying drawings:

[0052] See Figure 4 A method for processing a symmetrical gauge includes the following steps:

[0053] S1. Change the non-through groove on the gauge shaft 1 to a through square groove;

[0054] S2. Grind the working circle and the outer circle of the handle of the gauge body shaft 1, and use precision wire cutting to finish the square groove on the main shaft. Grind the working circle and the square groove of the gauge body shaft 1.

[0055] S3. Machining rectangular key 2 into a hexagonal structure;

[0056] S4. Grind rectangular key 2 according to the actual size of the square groove, and grind the four working surfaces of rectangular key 2;

[0057] S5. Apply sodium chloride solution to the four working surfaces of rectangular key 2, and assemble rectangular key 2 into the square groove of gauge shaft 1 until rectangular key 2 and gauge shaft 1 are firmly connected.

[0058] S6. Polish the top hole of the gauge shaft 1, and grind the working surface of the rectangular key 2 on a spline grinding machine;

[0059] S7. Perform local grinding on the outer circle of the connection between the main shaft and the rectangular key 2.

[0060] See Figure 4In another feasible embodiment of the present invention, the following modifications are made as appropriate. The non-through groove on the gauge shaft 1 is changed to a through square groove, reducing the over-positioning problem caused by the dual positioning of the keyway and screw in the original structure, thus allowing for only one mating method. Furthermore, machining a more precise square groove during the roughing stage helps release stress, uniformly distribute the finishing allowance, and reduce subsequent machining deformation. The working circle and outer circle of the shank of the gauge shaft 1 are precision ground, and the square groove on the main shaft is precision machined using precision wire cutting. The working circle and square groove of the gauge shaft 1 are then ground. Based on the precision outer circle as a reference, continuous precision wire cutting and grinding are performed on the square groove, giving it high machining accuracy and making it easier to achieve precise micro-clear clearance mating of the subsequent key and groove. The rectangular key 2 is machined as a hexagonal structure. The rectangular key 2 is ground to fit the actual dimensions of the square groove. The four working surfaces of the rectangular key 2 are ground. A firm connection between the square groove and the rectangular key 2 is usually achieved using an interference fit. Here, a small clearance fit is used because both the rectangular key 2 and the gauge shaft 1 are made of high-hardness materials. An interference fit would easily cause deformation of the outer diameter of the gauge shaft 1, and due to the limitations of the gauge structure, this deformation is difficult to eliminate. A sodium chloride solution is applied to the four working surfaces of the rectangular key 2. The rectangular key 2 is then assembled into the square groove of the gauge shaft 1 until the connection is secure. Applying sodium chloride or other oxidizing solutions causes oxidation on the metal mating surfaces of the gauge shaft and the rectangular key 2, creating a small interference fit effect with a small clearance. This also avoids the hardening and detachment problems that can occur when using adhesives or other connecting media. The top hole of the gauge shaft 1 is polished, and the working surfaces of the rectangular key 2 are ground on a spline grinder. The outer circle of the connection between the main shaft and the rectangular key 2 is locally ground. The spline grinder is a dry grinder, which introduces heat during processing, causing slight deformation at the interface between the rectangular key 2 and the square groove. Due to the high precision of the gauge, this deformation should be eliminated as much as possible to ensure the gauge is manufactured to quality or has a longer service life. Therefore, only the outer circle of the shaft at the keyway interface is ground with incomplete rotation to eliminate local high points. This grinding process has a very small machining allowance and is considered a micro-matter removal method. This invention reduces the machining difficulty of the gauge shaft and rectangular key, improves assembly accuracy, mitigates gauge shaft deformation and rectangular key detachment, avoids adhesive detachment problems, reduces machining and assembly difficulty, and improves the machining efficiency of symmetrical gauges.

[0061] Example 1:

[0062] Since the rectangular key mainly bears the grinding forces generated by the tangential and dimensional feed directions during precision machining, it is necessary to increase the mating area between the rectangular key and the gauge shaft. At the same time, during the assembly of the rectangular key, it is necessary to avoid partial high-point contact and deformation problems caused by the press fit of the two high-precision materials.

[0063] See Figure 4This embodiment discloses a method for processing a symmetrical gauge, including the following steps:

[0064] S1. Change the non-through groove on the gauge shaft 1 to a through square groove;

[0065] The specific process is as follows:

[0066] S11. Roughly grind the working circle and shank of the gauge shaft 1 to achieve a cylindricity and runout accuracy of less than 0.01 mm.

[0067] S12. Change the non-through groove on the gauge shaft 1 to a through square groove. Make a wire-passing hole smaller than the groove width at the square groove of the shaft. Use a wire cutting device to cut the square groove, so that each side of the square groove retains a machining allowance of at least 0.3mm. The symmetry of the square groove relative to the working circle of the gauge shaft 1 is within 0.02mm.

[0068] S13. The gauge shaft 1 with the square groove machined is subjected to quenching and aging heat treatment.

[0069] S2. Grind the working circle and the outer circle of the handle of the gauge body shaft 1, and use precision wire cutting to finish the square groove on the main shaft. Grind the working circle and the square groove of the gauge body shaft 1.

[0070] The specific process is as follows:

[0071] S21. Grind the working circle of the gauge shaft 1 with a precision grinding margin of 0.004mm-0.007mm, and finely grind the outer circle of the shank to ensure that the runout of the outer circle of the shank is within 0.005mm;

[0072] S22. Use precision wire cutting to finish machine the square groove on the main shaft. The working dimension of the square groove is 0.1mm-0.12mm larger than the overall drawing dimension. The square groove is parallel and perpendicular to the working outer circle of the gauge body by 0.01mm.

[0073] S23. Grind the working circle of the gauge shaft 1 to make the dimensional tolerance and cylindricity of the working circle within 0.002mm;

[0074] S24. Grind the square groove of the gauge shaft 1 to ensure that the parallelism, perpendicularity, and symmetry of the square groove are within 0.005mm. The oxide scale on the surface of the square groove must be removed. By specifying the machining dimensions of the square groove, the finishing allowance of the subsequent key can be limited, resulting in a smaller amount of deformation.

[0075] Preferably, the working circle and center hole of the gauge shaft 1 must be treated with rust prevention.

[0076] S3. Machining rectangular key 2 into a hexagonal structure;

[0077] The specific process is as follows:

[0078] S31. Machining rectangular key 2 into a hexagonal structure, leaving a machining allowance of 0.2mm-0.3mm on the working surface;

[0079] S32. The machined rectangular key 2 is quenched and subjected to aging heat treatment.

[0080] S4. Grind rectangular key 2 according to the actual size of the square groove, and grind the four working surfaces of rectangular key 2;

[0081] The specific process is as follows:

[0082] S41. Grind rectangular key 2 according to the actual size of the square groove, leaving a working dimension of 0.005mm-0.01mm for rectangular key 2;

[0083] S42. Grind the four working surfaces of the rectangular key 2. The assembly gap between the four working surfaces of the rectangular key 2 and the four sides of the square groove is no more than 0.005mm, so that the rectangular key 2 can slide in the square groove only under stress.

[0084] S5. Apply sodium chloride solution to the four working surfaces of rectangular key 2, and assemble rectangular key 2 into the square groove of gauge shaft 1 until rectangular key 2 and gauge shaft 1 are firmly connected.

[0085] The specific process is as follows:

[0086] S51. Apply sodium chloride solution to the four working surfaces of rectangular key 2, and then immediately assemble rectangular key 2 into the square groove of gauge shaft 1;

[0087] S52. Place the rectangular key 2 and the gauge shaft 1 together in a room temperature environment with humidity greater than 60% for more than 24 hours until the rectangular key 2 and the gauge shaft 1 are firmly connected due to oxidation.

[0088] S6. Polish the top hole of the gauge shaft 1, and grind the working surface of the rectangular key 2 on a spline grinding machine;

[0089] When grinding the working surface of rectangular key 2 on a spline grinder, the working surfaces at both ends of rectangular key 2 are ground alternately to obtain high symmetry, reduce deformation, and improve efficiency. If the grinding process of equipment such as spline grinder cannot meet the dimensional and positional requirements of the working surface of rectangular key 2, an appropriate grinding allowance is left before further grinding.

[0090] S7. Perform local grinding on the outer circle of the connection between the main shaft and the rectangular key 2.

[0091] The specific process is as follows:

[0092] Use a special large-aperture grinding sleeve 3 to perform local grinding on the outer circle of the connection between the main shaft and the rectangular key 2. See [link / reference] Figure 3 This is a structural diagram of a grinding sleeve used for fixed-stroke grinding.

[0093] The opening size of the grinding sleeve 3 should be 5mm to 8mm larger than the width of the rectangular key 2, and the grinding paste should be made of cast iron material with a hardness of HB180 or less.

[0094] This invention avoids the shortcomings of existing technologies and achieves efficient and precise manufacturing of gauges. Specific effects are as follows:

[0095] The machining difficulty of the gauge shaft and rectangular key was reduced, while assembly accuracy was improved. Specifically, the rectangular key was machined as a hexahedron, requiring only dimensional and positional control before assembly, without considering the relationship between the working surface and screw holes, thus reducing its machining difficulty. Furthermore, thanks to precision wire EDM technology, the machining accuracy of the rectangular groove on the gauge shaft was improved compared to machining with tools like tool grinding, further reducing the difficulty of subsequent machining.

[0096] This avoids the problem of adhesive detachment. The new through-groove process increases the bonding area between the rectangular key and the gauge body, enhancing the strength of their fit and making the rectangular key less prone to detachment; the oxidation effect of sodium chloride solution on the metal also prevents the adhesive from hardening and detaching.

[0097] The new process eliminates the need for remapping of the gauge shaft after finishing. For example, when using electrical discharge machining to machine pin holes, the gauge shaft needs to be re-machined, thus avoiding damage to the working circle of the gauge shaft and reducing deformation of the working circle.

[0098] Using a fixed-stroke grinding process can further repair micro-deformations caused during assembly, which is more beneficial for parts quality control.

[0099] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method of processing a symmetry gauge, characterized by, It comprises the following steps: Change the non-through slot on the gauge body shaft (1) to a through square slot, and the specific process is as follows: Coarsely grind the working circle and handle of the gauge body shaft (1) to make the cylindricity and runout of the working circle and handle reach the accuracy within 0.01 mm; Make a wire hole smaller than the slot width at the square slot of the shaft, and cut the square slot by using a wire cutting device, so that each side of the square slot is left with a machining allowance of at least 0.3 mm, and the symmetry of the square slot relative to the working circle of the gauge body shaft (1) reaches within 0.02 mm; Quench and age treat the gauge body shaft (1) after the square slot is processed; Finely grind the working circle and handle outer circle of the gauge body shaft (1), and precisely cut the square slot on the main shaft by using a precise wire cutting device, and grind the working circle and square slot of the gauge body shaft (1); Process the rectangular key (2) according to the hexahedron structure; Grind the rectangular key (2) according to the actual size of the square slot, and grind the four square working surfaces of the rectangular key (2), and the specific process is as follows: Grind the rectangular key (2) according to the actual size of the square slot, and leave a working size of 0.005 mm-0.01 mm for the rectangular key (2); Grind the four square working surfaces of the rectangular key (2), and the assembly gap between the four square working surfaces of the rectangular key (2) and the four sides of the square slot is not greater than 0.005 mm, so that the rectangular key (2) can only slide in the square slot in a stressed state; Coat the four square working surfaces of the rectangular key (2) with sodium chloride solution, assemble the rectangular key (2) into the square slot of the gauge body shaft (1), and keep assembling until the rectangular key (2) and the gauge body shaft (1) are firmly connected, and the specific process is as follows: Coat the four square working surfaces of the rectangular key (2) with sodium chloride solution, and then immediately assemble the rectangular key (2) into the square slot of the gauge body shaft (1); Place the rectangular key (2) and the gauge body shaft (1) in a room with a humidity greater than 60% at room temperature for more than 24 hours until the rectangular key (2) and the gauge body shaft (1) are firmly connected due to oxidation; Polish the top hole of the gauge body shaft (1), and grind the working surface of the rectangular key (2) on a spline grinding machine; Partially grind the outer circle of the connection part between the main shaft and the rectangular key (2).

2. The method of claim 1, wherein the symmetric gauge is a function of the difference between the first and second signals. The working circle and handle outer circle of the gauge body shaft (1) are finely ground, the square slot on the main shaft is precisely cut by using a precise wire cutting device, and the working circle and square slot of the gauge body shaft (1) are ground, and the specific process is as follows: Finely grind the working circle of the gauge body shaft (1) and leave a grinding allowance of 0.004 mm-0.007 mm, and finely grind the handle outer circle to ensure that the runout of the handle outer circle is within 0.005 mm; Precisely cut the square slot on the main shaft by using a precise wire cutting device, the working size of the square slot is 0.1 mm-0.12 mm larger than the total size, and the square slot is parallel and perpendicular to the working outer circle of the gauge body within 0.01 mm; Grind the working circle of the gauge body shaft (1) to make the size tolerance and cylindricity of the working circle reach within 0.002 mm; Grind the square slot of the gauge body shaft (1) to make the parallelism, perpendicularity and symmetry of the square slot reach within 0.005 mm, and the oxide skin on the surface of the square slot must be ground off.

3. The method of claim 1, wherein the symmetric gauge is a function of the difference between the first and second signals. 5 The working circle and center hole of the gauge body shaft (1) must be subjected to rust prevention treatment.

4. The processing method of a symmetrical gauge as described in claim 1, characterized in that, The process of processing the rectangular key (2) according to the hexahedron structure is as follows: The rectangular key (2) is processed in a hexagonal structure, and the working surface is left with a processing allowance of 0.2mm-0.3mm; The processed rectangular key (2) is quenched and aged.

5. The processing method of a symmetrical gauge as described in claim 1, characterized in that, When the working surface of the rectangular key (2) is ground on the spline grinder, the working surfaces at both ends of the rectangular key (2) are alternately ground. If the grinding process of the spline grinding equipment cannot meet the size and position requirements of the working surface of the rectangular key (2), the appropriate grinding allowance is left for further processing by grinding.

6. The method of claim 1, wherein the symmetric gauge is a function of the difference between the first and second signals. 5 The specific process of locally grinding the outer circle of the connecting part of the main shaft and the rectangular key (2) is as follows: A special large-opening grinding sleeve (3) is used to locally grind the outer circle of the connecting part of the main shaft and the rectangular key (2).

7. A method of processing a symmetric gauge according to claim 6, wherein, The opening size of the grinding sleeve (3) should be 5mm to 8mm larger than the width of the rectangular key (2), and the grinding paste is made of cast iron material with a hardness of HB180 or below.

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