Machining method of eccentric bearing bush

Abstract

The invention discloses a machining method of an eccentric bearing bush, and effectively solves the problems that dimensional deviation occurs in the machining process, consistency of sizes and shapes of all parts of the eccentric bearing bush cannot be guaranteed, accurate machining of sharp edges and notches cannot be guaranteed and the like, so that the complete machine tool requirements and market requirements of equipment can be met. The method comprises the steps that a turning tool is used for conducting rough turning and finish turning on raw materials on medium turning equipment, and the raw materials are made into the eccentric bearing bush with the specified size and shape; milling the turned eccentric bearing bush on universal milling equipment by using a milling clamp and a saw blade milling cutter, dividing the eccentric bearing bush into a plurality of pieces, and performing sharp edge chamfering; carrying out notch milling on the two ends of the eccentric bearing bush by using an end mill on end milling equipment; burrs of the eccentric bearing bush are removed, and all sharp edges on the eccentric bearing bush are chamfered; the straightness of the inner arc generatrix of the eccentric bearing bush is pressed and corrected through a press machine and a bearing bush correction tool; and tempering the eccentric bearing bush.

Description

Technical Field

[0001] The present application relates to the technical field of bearing bush processing, and in particular to a processing method of an eccentric bearing bush. Background Art

[0002] Eccentric bearings are widely used in various mechanical equipment, especially in situations where the position and motion trajectory of rotating parts need to be precisely controlled. However, the processing of eccentric bearings is relatively complicated and has extremely high requirements on processing accuracy and surface quality.

[0003] There are many shortcomings in the existing eccentric bearing processing methods. On the one hand, during the processing of the eccentric bearing, dimensional deviations may occur in the raw materials during the rough and fine turning stages, affecting the accuracy of subsequent processing and assembly. On the other hand, in processing steps such as milling and drilling, the existing processing methods are difficult to ensure the consistency of size and shape of each part of the eccentric bearing, as well as the precise processing of sharp edges and notches, and thus cannot meet the requirements of equipment and machine tools and market demand. Summary of the invention

[0004] The present application provides a method for processing an eccentric bearing bushing to solve the above-mentioned technical problems.

[0005] The present application provides a method for processing an eccentric bearing bush, comprising:

[0006] Use lathe tools on CRRC equipment to perform rough and fine lathe processing on the raw materials, and make the raw materials into eccentric bearings of specified sizes and shapes;

[0007] Use a milling fixture and a saw blade milling cutter to mill the turned eccentric bearing on a milling machine, divide it into multiple pieces, and perform sharp edge chamfering;

[0008] Use end mills on end milling equipment to perform notch milling on both ends of the eccentric bearing;

[0009] Remove the burrs from the eccentric bearing and chamfer the sharp edges on the eccentric bearing;

[0010] The inner arc generatrix straightness of the eccentric bearing is pressed and corrected by a press machine and a bearing correction tool;

[0011] Tempering the eccentric bearing bush;

[0012] The first lathe fixture and lathe tool bar are used on the CRRC equipment to perform semi-finishing turning on the inner arc of the eccentric bearing;

[0013] Drill holes on eccentric bearings using a drilling fixture and drill bit on a vertical drilling device;

[0014] The outer arc of the eccentric bearing is semi-finished by using the second car fixture on the CRRC equipment;

[0015] Grinding the outer arc of the eccentric bearing bush using the second vehicle fixture on the external grinding equipment to achieve the preset dimensional accuracy, cylindricity and roughness requirements;

[0016] Remove burrs from eccentric bearings and chamfer sharp edges;

[0017] The inner arc of the eccentric bearing is finely turned using a third-party vehicle fixture on the CRRC equipment to meet the preset dimensional tolerance and roughness requirements;

[0018] Grinding the outer arc of the eccentric bearing bush with a grinding fixture on the external grinding equipment to meet the preset dimensional tolerance and roughness requirements, and to ensure that the generatrix parallelism of the inner and outer circles of the eccentric bearing bush and the generatrix straightness of the outer arc meet the preset requirements;

[0019] Carry out qualitative treatment on the eccentric bearing bush by boiling it in oil, and cool it to room temperature with the oil after keeping it warm;

[0020] The inner arc of the eccentric bearing is scraped to make the eccentric bearing meet the preset contact surface requirements;

[0021] On the precision grinding equipment, the outer arc of the eccentric bearing is roughly and finely ground by a grinding fixture to meet the overall requirements of the equipment and machine tools for the eccentric bearing;

[0022] Chamfer, deburr and round the eccentric bearing.

[0023] Optionally, the raw material is roughed and finely turned using lathe tools on the CRRC equipment to make the raw material into an eccentric bearing of a specified size and shape, including:

[0024] The raw materials are rough-turned and fine-turned using lathe tools on CRRC equipment to make eccentric bearings of specified sizes and shapes. The coaxiality and straightness of the inner hole and outer circle of the eccentric bearing are both 0.03, and the perpendicularity between the two end faces of the eccentric bearing and the hole is 0.03.

[0025] Optionally, the inner arc of the eccentric bearing bush is semi-finished by using the first lathe fixture and lathe tool bar on the CRRC equipment, including:

[0026] When the inner arc of the eccentric bearing is semi-finished by using the first lathe fixture and lathe tool bar on the CRRC equipment, the inner arc of the eccentric bearing is inspected by using a scraping mandrel, the contact area between the scraping mandrel and the inner arc of the eccentric bearing is greater than 50%, and the wall thickness of the eccentric bearing is not less than a first preset value.

[0027] Optionally, the inner arc of the eccentric bearing bush is finely turned using a third-party vehicle fixture on the CRRC equipment, including:

[0028] When the third vehicle fixture is used on the CRRC equipment to perform fine turning on the inner arc of the eccentric bearing, the inner arc of the eccentric bearing is checked with a scraping mandrel, the contact area between the scraping mandrel and the inner arc of the eccentric bearing is greater than 60%, and the wall thickness of the eccentric bearing is not less than a second preset value.

[0029] Optionally, the eccentric bearing bush is subjected to a qualitative treatment by boiling in oil, and after being kept warm, cooled to room temperature with the oil, including:

[0030] The eccentric bearing bush is subjected to a qualitative treatment of oil boiling at a third preset temperature for several hours, and then cooled to room temperature with the oil.

[0031] Optionally, the eccentric bearing is drilled using a drilling fixture and a drill bit on a vertical drilling device, including:

[0032] The eccentric bearing is drilled using a drilling fixture and a flat bottom drill bit on a vertical drilling device.

[0033] Optionally, after rough and fine turning the raw material using a lathe tool on the CRRC equipment to make the raw material into an eccentric bearing bush of a specified size and shape, the method further includes:

[0034] Chamfer the eccentric bearing.

[0035] Optionally, remove the burrs of the eccentric bearing and chamfer the sharp edges on the eccentric bearing, including:

[0036] The burrs of the eccentric bearing are removed, and each sharp edge on the eccentric bearing is chamfered, and the chamfering angle is a preset angle.

[0037] Optionally, a second vehicle fixture is used on the CRRC equipment to perform semi-finish turning of the outer arc of the eccentric bearing, including:

[0038] After positioning using the inner arc and side surface of the eccentric bearing bush on the CRRC equipment, semi-finish turning of the outer arc of the eccentric bearing bush is performed using a second vehicle fixture on the CRRC equipment.

[0039] Optionally, a second vehicle fixture is used on the external grinding equipment to grind the outer arc of the eccentric bearing to achieve the preset dimensional accuracy, cylindricity and roughness requirements, including:

[0040] After positioning the eccentric bearing bush using the inner arc and side surface on the external grinding equipment, the outer arc of the eccentric bearing bush is ground using the second vehicle fixture to achieve the preset dimensional accuracy, cylindricity and roughness requirements.

[0041] It can be seen from the above technical solutions that this application has the following advantages:

[0042] 1. The method of the present application can significantly improve the processing accuracy and consistency of the eccentric bearing, ensuring that the size, shape and surface quality of the eccentric bearing meet the design requirements, thereby improving the overall performance and reliability of the eccentric bearing.

[0043] 2. The steps of tempering treatment, oil boiling qualitative treatment, etc. included in the processing process can help eliminate the stress and defects inside the eccentric bearing, enhance the performance and stability of the eccentric bearing, and enable the eccentric bearing to better resist wear, corrosion and deformation during use, thereby extending its service life.

[0044] 3. This processing method includes multiple steps from raw material processing to eccentric bearing, including turning, milling, drilling, grinding and other processing methods, as well as scraping, chamfering and other detailed processing steps. This enables the processing method to flexibly respond to the processing needs of eccentric bearings of different specifications, shapes and requirements, and effectively solve the problems of dimensional deviation during the processing, the inability to ensure the consistency of size and shape of various parts of the eccentric bearing, and the precise processing of sharp edges and notches, thereby meeting the requirements of equipment and machine tools and market demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of an embodiment of the processing method of the eccentric bearing bush of the present application. DETAILED DESCRIPTION

[0046] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0047] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0048] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0050] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] There are many shortcomings in the existing eccentric bearing processing methods. On the one hand, during the processing of the eccentric bearing, dimensional deviations may occur in the raw materials during the rough and fine turning stages, affecting the accuracy of subsequent processing and assembly. On the other hand, in the processing steps such as milling and drilling, the existing processing methods are difficult to ensure the consistency of the size and shape of the various parts of the eccentric bearing, as well as the precise processing of sharp edges and notches. As a result, the existing eccentric bearing processing methods are difficult to produce eccentric bearings that meet the requirements of equipment and machine tools and market demand.

[0052] Based on this, the present application provides a method for processing an eccentric bearing, which can effectively solve the problems of dimensional deviation during the processing, the inability to ensure the consistency of size and shape of various parts of the eccentric bearing, and the precise processing of sharp edges and notches, thereby meeting the requirements of equipment and machine tools and market demand.

[0053] It should be noted that the eccentric bearing bushing manufactured by the eccentric bearing bushing processing method of the present application is preferably used on a centerless grinder, and can also be used on other grinders, which is not specifically limited here.

[0054] See also Figure 1 The present application provides a method for processing an eccentric bearing bush, comprising:

[0055] 101. Use lathe tools to perform rough and fine lathe processing on raw materials on CRRC equipment to make eccentric bearings of specified size and shape;

[0056] 102. Use a milling fixture and a saw blade milling cutter to mill the turned eccentric bearing on a milling machine, divide it into multiple pieces, and perform sharp edge chamfering;

[0057] 103. Use an end mill on the end milling equipment to perform notch milling on both ends of the eccentric bearing;

[0058] 104. Remove the burrs of the eccentric bearing and chamfer the sharp edges of the eccentric bearing;

[0059] 105. Use a press and a bearing correction tool to press and correct the straightness of the inner arc generatrix of the eccentric bearing;

[0060] 106. Temper the eccentric bearing bush;

[0061] 107. Use the first lathe fixture and lathe tool bar to perform semi-finishing turning on the inner arc of the eccentric bearing on the CRRC equipment;

[0062] 108. Use a drilling fixture and a drill bit on a vertical drilling device to drill holes in the eccentric bearing;

[0063] 109. Use the second lathe fixture on the CRRC equipment to perform semi-finishing turning on the outer arc of the eccentric bearing;

[0064] 110. Grind the outer arc of the eccentric bearing bush using the second vehicle fixture on the external grinding equipment to achieve the preset dimensional accuracy, cylindricity and roughness requirements;

[0065] 111. Remove burrs from eccentric bearings and chamfer sharp edges;

[0066] 112. Use the third-party vehicle fixture on the CRRC equipment to perform precision turning on the inner arc of the eccentric bearing to meet the preset dimensional tolerance and roughness requirements;

[0067] 113. Grind the outer arc of the eccentric bearing bush using a grinding fixture on the external grinding equipment to meet the preset dimensional tolerance and roughness requirements, and make the generatrix parallelism of the inner and outer circles of the eccentric bearing bush and the generatrix straightness of the outer arc meet the preset requirements;

[0068] 114. Perform qualitative treatment on the eccentric bearing by boiling it in oil, and cool it to room temperature with the oil after keeping it warm;

[0069] 115. Scrape the inner arc of the eccentric bearing bush so that the eccentric bearing bush meets the preset contact surface requirements;

[0070] 116. Rough and fine grinding of the outer arc of the eccentric bearing is performed on the precision grinding equipment by means of a grinding fixture to meet the overall requirements of the equipment and machine tools for the use of the eccentric bearing;

[0071] 117. Chamfer, deburr and round the eccentric bearing.

[0072] In the embodiment of the present application, firstly, a lathe tool is used on a rolling stock equipment to perform rough and fine lathe processing on the raw material, and the raw material is made into an eccentric bearing of a specified size and shape. Then, a milling fixture and a saw blade milling cutter are used to mill the turned eccentric bearing on a milling equipment to divide it into multiple pieces, and the sharp edges of the eccentric bearing are chamfered. After the sharp edge chamfering is completed, a vertical milling cutter is used on a vertical milling equipment to perform notch milling on both ends of the eccentric bearing, and then the burrs of the eccentric bearing are removed, and the sharp edges on the eccentric bearing are chamfered. After the chamfering is completed, the eccentric bearing is processed by a press and a bearing calibration machine. The positive tool is used to press and correct the straightness of the inner arc generatrix of the eccentric bearing, and the eccentric bearing is tempered. After the tempering, the first vehicle fixture and vehicle tool bar are used on the mid-roller equipment to semi-finish turning the inner arc of the eccentric bearing, and the drilling fixture and drill bit are used on the vertical drilling equipment to drill the eccentric bearing. Then, the second vehicle fixture is used on the mid-roller equipment to semi-finish turning the outer arc of the eccentric bearing, and the second vehicle fixture is used on the external grinding equipment to grind the outer arc of the eccentric bearing to achieve the preset dimensional accuracy, cylindricity and roughness requirements.

[0073] Then remove the burrs of the eccentric bearing again and chamfer the sharp edges. After that, use the third vehicle fixture on the CRRC equipment to perform fine turning on the inner arc of the eccentric bearing, and use the grinding die on the external grinding equipment to grind the outer arc of the eccentric bearing. Then, perform oil boiling qualitative treatment on the eccentric bearing. After insulation, cool it to room temperature with the oil. The inner arc of the eccentric bearing needs to be scraped so that the eccentric bearing meets the preset contact surface requirements. Finally, use the grinding fixture on the precision grinding equipment to perform rough and fine grinding on the outer arc of the eccentric bearing to meet the design and process requirements. Finally, use a hand scraper to chamfer the eccentric bearing, and then use other equipment to remove burrs and chamfer to obtain the finished eccentric bearing.

[0074] In step 101, a lathe tool is used on a lathe equipment to perform rough and fine lathe processing on the raw material, and the raw material is made into an eccentric bearing bush of a specified size and shape;

[0075] In the embodiment of the present application, before preparing the eccentric bearing, preparations must be made starting from the raw materials. First, suitable metal raw materials are selected, and then the blank body of the eccentric bearing is made. The blank body of the eccentric bearing is made by utilizing the centrifugal force of a centrifuge to cast the tin bronze material in a steel sleeve made of No. 15 steel. It should be noted that, for the metal raw materials for making the blank body of the eccentric bearing, in addition to those described above, other metal raw materials may also be used, and no specific limitation is made here.

[0076] The blank body of the eccentric bearing is made of tin bronze material and No. 15 steel, which can ensure that the eccentric bearing has sufficient wear resistance, corrosion resistance, ductility and toughness. Then, a car fixture is used to fix the raw material to ensure that it remains stable during the processing. The raw material is rough-turned by car tool bars and car tools on CRRC equipment to quickly remove excess material and approach the design size. Then, the workpiece after rough processing is fine-turned, and the size and shape are carefully adjusted. The eccentric bearing is then chamfered to ensure that the initial contour of the eccentric bearing made of the raw material meets the design requirements.

[0077] Among them, it should be noted that the raw materials are rough-turned and fine-turned using lathe tools on CRRC equipment to make the raw materials into eccentric bearings of specified sizes and shapes. The coaxiality and straightness of the inner hole and outer circle of the eccentric bearing are both 0.03, and the perpendicularity between the two end faces of the eccentric bearing and the hole is 0.03.

[0078] In step 102, the eccentric bearing bush after turning is milled on a milling device using a milling fixture and a saw blade milling cutter, divided into multiple pieces, and sharp edge chamfering is performed;

[0079] In an embodiment of the present application, a milling fixture is used to fix the eccentric bearing with a preliminary contour to ensure that it will not move or deform during the milling process. The eccentric bearing is then milled using a saw blade milling cutter on a milling device to divide the eccentric bearing into multiple single pieces as required. After cutting is completed, the divided edges are further chamfered to remove sharp edges and reduce the risk of damage during use.

[0080] In step 103, notches are milled on both ends of the eccentric bearing bush using an end milling cutter on an end milling device;

[0081] In the embodiment of the present application, the end milling equipment can provide a stable processing platform to ensure the accuracy of the milling process. The end mill is a tool with a suitable shape and cutting edge to adapt to the design requirements for the notch at both ends of the eccentric bearing. When notch milling is performed on both ends of the eccentric bearing, the notch size, shape and position are ensured so that the notch milling meets the design requirements.

[0082] In step 104, the burrs of the eccentric bearing are removed, and each sharp edge of the eccentric bearing is chamfered;

[0083] In the embodiments of the present application, hand tools such as files, sandpaper, etc. are used to carefully remove burrs on the surface of the eccentric bearing, and chamfer the sharp edges on the eccentric bearing to make the edges smoother and reduce the risk of scratches, thereby improving the surface quality, reducing safety hazards during use, and improving product reliability.

[0084] Among them, the burrs of the eccentric bearing are removed, and the sharp edges on the eccentric bearing are chamfered with a chamfer angle of 45°

[0085] In step 105, the inner arc generatrix straightness of the eccentric bearing is pressed and corrected by a press machine and a bearing correction tool;

[0086] In an embodiment of the present application, the press provides sufficient pressure to tightly fit the inner arc generatrix of the eccentric bearing, and the bearing correction tool is used to adjust the straightness of the inner arc generatrix. Through the pressing and correction process, the deviation of the inner arc generatrix can be eliminated and its straightness can be improved, thereby reducing the fitting problems caused by straightness deviation.

[0087] In step 106, the eccentric bearing bush is tempered;

[0088] In the embodiment of the present application, the tempering treatment is a process in which the eccentric bearing is heated to a certain temperature, kept warm for a period of time, and then slowly cooled. The tempering heating helps to eliminate the internal stress generated during the processing, improve the stability and toughness of the material, reduce deformation or cracks caused by internal stress during use, and improve the durability of the eccentric bearing.

[0089] In step 107, semi-finishing turning is performed on the inner arc of the eccentric bearing bush using a first lathe fixture and a lathe tool bar on the lathe equipment;

[0090] In an embodiment of the present application, when turning processing is performed on the mid-car equipment, the guiding role of the first vehicle fixture is utilized, and during the processing, the cutting speed of the vehicle tool bar is controlled and the feed amount of the processing is controlled by utilizing the mid-car equipment, thereby realizing turning processing of the inner arc to ensure the processing quality and efficiency. By using the first vehicle fixture to turn the inner arc of the eccentric bearing, the processing accuracy and surface quality of the inner arc can be effectively improved, the coordination of the inner arc with the overall design can be ensured, and the practicality of the eccentric bearing can be improved.

[0091] Among them, it should be noted that when the inner arc of the eccentric bearing is turned using the first vehicle fixture and the vehicle tool rod on the CRRC equipment, the inner arc of the eccentric bearing is inspected using a scraping mandrel, and the contact area between the scraping mandrel and the inner arc of the eccentric bearing is greater than 50%, and the wall thickness of the eccentric bearing is not less than a first preset value, wherein the first preset value is preferably 15.9, and can also be set to other values, which are not specifically limited here.

[0092] In step 108, the eccentric bearing bush is drilled using a drilling fixture and a drill bit on a vertical drilling device;

[0093] In an embodiment of the present application, the vertical drilling equipment can provide a stable drilling platform to ensure the accuracy of the drilling process. The drilling fixture is used to fix the eccentric bearing and guide the drill bit to accurately enter the predetermined position. The vertical drilling equipment uses a drilling fixture and a flat-bottom drill bit to drill the eccentric bearing.

[0094] Among them, the vertical drilling equipment uses a drilling fixture and a flat-bottomed drill bit to drill the eccentric bearing.

[0095] In step 109, a second vehicle fixture is used on the vehicle equipment to perform semi-finish turning on the outer arc of the eccentric bearing bush;

[0096] In the embodiment of the present application, the outer arc of the eccentric bearing is processed by using a second vehicle fixture on the CRRC equipment to ensure that the size, shape and surface quality of the eccentric bearing meet the processing requirements. It should be noted that when turning the outer arc of the eccentric bearing on the CRRC equipment, the cutting parameters such as cutting speed, feed rate and cutting depth are controlled to ensure the processing quality and efficiency.

[0097] Among them, after positioning the inner arc and side of the eccentric bearing on the CRRC equipment, the outer arc of the eccentric bearing is turned using a second vehicle fixture.

[0098] In step 110, the outer arc of the eccentric bearing bush is ground using a second vehicle fixture on an external grinding device to achieve preset dimensional accuracy, cylindricity and roughness requirements;

[0099] In an embodiment of the present application, the external grinding equipment provides a stable grinding platform to ensure the stability of the grinding process, wherein the second vehicle fixture is used to clamp the eccentric bearing and position the eccentric bearing, and the grinding wheel on the external grinding equipment grinds the eccentric outer arc to meet the cylindricity and roughness requirements of the eccentric bearing. It should be noted that by controlling the grinding pressure and cooling and lubrication conditions during the grinding process, surface burns or cracks of the eccentric bearing can be effectively avoided.

[0100] Among them, after positioning the inner arc and side of the eccentric bearing on the external grinding equipment, the outer arc of the eccentric bearing is ground using a second vehicle fixture on the external grinding equipment, and the cylindricity reaches 0.01 and the roughness is Ra3.2-Ra1.6.

[0101] In step 111, the burrs of the eccentric bearing are removed and the sharp edges are chamfered;

[0102] In an embodiment of the present application, after the outer arc grinding process of step 110 and the cylindricity and roughness of the eccentric bearing meet the requirements, a file or sandpaper or other tool is used again to remove the burrs generated during the grinding process, and the sharp edges on the eccentric bearing are chamfered to make the edges smoother and reduce the risk of scratches.

[0103] In step 112, the inner arc of the eccentric bearing bush is finely turned using a third vehicle fixture on the vehicle equipment to meet the preset dimensional tolerance requirements and roughness requirements;

[0104] In the embodiment of the present application, the inner arc of the eccentric bearing is fine-turned, which is to further fine-turn the inner arc on the basis of the previous rough turning, by using a third turning fixture and tool to ensure that the inner arc meets the preset dimensional tolerance requirements and roughness requirements.

[0105] Among them, when using a vehicle fixture on the CRRC equipment to perform finish turning on the inner arc of the eccentric bearing, a scraping mandrel is used to check the inner arc of the eccentric bearing, the contact area between the scraping mandrel and the inner arc of the eccentric bearing is greater than 60%, and the wall thickness of the eccentric bearing is not less than a second preset value, which is preferably 15.10, and can also be set to other values, which are not specifically limited here.

[0106] In step 113, the outer arc of the eccentric bearing is ground using a grinding fixture on an external grinding device to meet the preset dimensional tolerance requirements and roughness requirements, and the generatrix parallelism of the inner and outer circles of the eccentric bearing and the generatrix straightness of the outer arc meet the preset requirements;

[0107] In an embodiment of the present application, a grinding fixture and a grinding tool are used on an external grinding device to perform a final grinding process on the outer arc to ensure that the size, shape and surface quality of the outer arc of the eccentric bearing meet the processing requirements. It should be noted that by controlling the grinding pressure and cooling and lubrication conditions during the grinding process, surface damage or deformation of the eccentric bearing can be effectively avoided. After the grinding process, the eccentric bearing meets the preset dimensional tolerance requirements and roughness requirements. The generatrix parallelism of the inner and outer circles of the eccentric bearing is required to be 0.02 within a length of 150, and the generatrix straightness of the outer arc is 0.01.

[0108] In step 114, the eccentric bearing bush is subjected to a qualitative treatment by boiling in oil, and after being kept warm, it is cooled to room temperature along with the oil;

[0109] In an embodiment of the present application, after the outer arc grinding of the eccentric bearing, the eccentric bearing is subjected to oil boiling qualitative treatment, that is, the eccentric bearing is immersed in heated oil, kept warm for a period of time and then cooled to room temperature with the oil. The oil boiling qualitative process helps to eliminate the residual stress inside the material and improve the stability and durability of the eccentric bearing.

[0110] The eccentric bearing bush is subjected to a qualitative treatment of oil boiling, the oil boiling temperature is a third preset value, and the oil is kept warm for several hours, and then cooled to room temperature with the oil. It should be noted that in the present application, the oil boiling temperature is preferably set to 160°, and the heat preservation time is 6 hours, but in the application, the oil boiling temperature and the heat preservation time can be set according to the actual situation, and no specific limitation is made here.

[0111] In step 115, the inner arc of the eccentric bearing is scraped so that the eccentric bearing meets the preset contact surface requirements;

[0112] In the embodiment of the present application, after the outer arc of the eccentric bearing reaches the processing accuracy and surface quality required, the inner arc of the eccentric bearing that has undergone inner arc finishing machining is scraped so that the eccentric bearing meets the preset assembly contact surface requirements.

[0113] In step 116, the outer arc of the eccentric bearing is subjected to rough and fine grinding by a grinding die fixture on a fine grinding device to meet the overall requirements of the machine tool for using the eccentric bearing;

[0114] In the embodiment of the present application, after the eccentric bearing is processed through the above steps, the eccentric bearing is further clamped and fixed using a grinding fixture, and then the outer arc of the eccentric bearing is rough-ground and fine-ground respectively by fine grinding equipment to meet the overall requirements of the equipment and machine tools using the eccentric bearing.

[0115] In step 117, the eccentric bearing bush is chamfered, deburred and rounded;

[0116] In the embodiment of the present application, the eccentric bearing after the above treatment is subjected to the final treatment, that is, the eccentric bearing is chamfered by hand scraping, and the eccentric bearing is deburred and chamfered by other tools to obtain the final processed eccentric bearing.

[0117] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for processing an eccentric bearing bush, characterized in that: include: Use lathe tools on CRRC equipment to perform rough and fine lathe processing on the raw materials, and make the raw materials into eccentric bearings of specified sizes and shapes; Use a milling fixture and a saw blade milling cutter to mill the turned eccentric bearing on a milling machine, divide it into multiple pieces, and perform sharp edge chamfering; Use end mills on end milling equipment to perform notch milling on both ends of the eccentric bearing; Remove the burrs from the eccentric bearing and chamfer the sharp edges on the eccentric bearing; The inner arc generatrix straightness of the eccentric bearing is pressed and corrected by a press machine and a bearing correction tool; Tempering the eccentric bearing bush; The first lathe fixture and lathe tool bar are used on the CRRC equipment to perform semi-finishing turning on the inner arc of the eccentric bearing; Drill holes on eccentric bearings using a drilling fixture and drill bit on a vertical drilling device; The outer arc of the eccentric bearing is semi-finished by using the second car fixture on the CRRC equipment; Grinding the outer arc of the eccentric bearing bush using the second vehicle fixture on the external grinding equipment to achieve the preset dimensional accuracy, cylindricity and roughness requirements; Remove burrs from eccentric bearings and chamfer sharp edges; The inner arc of the eccentric bearing is finely turned using a third-party vehicle fixture on the CRRC equipment to meet the preset dimensional tolerance and roughness requirements; Grinding the outer arc of the eccentric bearing bush with a grinding fixture on the external grinding equipment to meet the preset dimensional tolerance and roughness requirements, and to ensure that the generatrix parallelism of the inner and outer circles of the eccentric bearing bush and the generatrix straightness of the outer arc meet the preset requirements; The eccentric bearing bush is subjected to qualitative treatment by boiling in oil, and after heat preservation, it is cooled to room temperature along with the oil; The inner arc of the eccentric bearing is scraped to make the eccentric bearing meet the preset contact surface requirements; On the precision grinding equipment, the outer arc of the eccentric bearing is roughly and finely ground by means of a grinding fixture to meet the overall requirements of the equipment and machine tools for the use of the eccentric bearing; Chamfer, deburr and round the eccentric bearing.

2. The method for processing an eccentric bearing bush according to claim 1, characterized in that: The raw materials are roughed and finished by lathe tools on CRRC equipment to make eccentric bearings of specified size and shape, including: The raw materials are rough-turned and fine-turned using lathe tools on CRRC equipment to make eccentric bearings of specified sizes and shapes. The coaxiality and straightness of the inner hole and outer circle of the eccentric bearing are both 0.03, and the perpendicularity between the two end faces of the eccentric bearing and the hole is 0.

03.

3. The method for processing an eccentric bearing bush according to claim 1, characterized in that: The first lathe fixture and lathe tool bar are used on the CRRC equipment to perform semi-finishing turning on the inner arc of the eccentric bearing, including: When the inner arc of the eccentric bearing is semi-finished by using the first lathe fixture and lathe tool bar on the CRRC equipment, the inner arc of the eccentric bearing is inspected by using a scraping mandrel, the contact area between the scraping mandrel and the inner arc of the eccentric bearing is greater than 50%, and the wall thickness of the eccentric bearing is not less than a first preset value.

4. The method for processing an eccentric bearing bush according to claim 1, characterized in that: The inner arc of the eccentric bearing is finely turned using the third-party vehicle fixture on the CRRC equipment, including: When the third vehicle fixture is used on the CRRC equipment to perform fine turning on the inner arc of the eccentric bearing, the inner arc of the eccentric bearing is checked with a scraping mandrel, the contact area between the scraping mandrel and the inner arc of the eccentric bearing is greater than 60%, and the wall thickness of the eccentric bearing is not less than a second preset value.

5. The method for processing an eccentric bearing bush according to claim 1, characterized in that: The eccentric bearing bush is subjected to oil boiling qualitative treatment, and after heat preservation, it is cooled to room temperature with the oil, including: The eccentric bearing bush is subjected to a qualitative treatment of oil boiling at a third preset temperature for several hours, and then cooled to room temperature with the oil.

6. The method for processing an eccentric bearing bush according to claim 1, characterized in that: The eccentric bearing is drilled using a drilling fixture and a drill bit on a vertical drilling device, including: The eccentric bearing is drilled using a drilling fixture and a flat bottom drill bit on a vertical drilling device.

7. The method for processing an eccentric bearing bush according to claim 1, characterized in that: After rough and fine turning the raw material using a lathe tool on the CRRC equipment to make the raw material into an eccentric bearing bush of a specified size and shape, the method further includes: Chamfer the eccentric bearing.

8. The method for processing an eccentric bearing bush according to claim 1, characterized in that: Remove the burrs from the eccentric bearing and chamfer the sharp edges on the eccentric bearing, including: The burrs of the eccentric bearing are removed, and each sharp edge on the eccentric bearing is chamfered, and the chamfering angle is a preset angle.

9. The method for processing an eccentric bearing bush according to claim 1, characterized in that: The second car fixture is used on the CRRC equipment to perform semi-finishing turning on the outer arc of the eccentric bearing, including: After positioning using the inner arc and side surface of the eccentric bearing bush on the CRRC equipment, semi-finish turning of the outer arc of the eccentric bearing bush is performed using a second vehicle fixture on the CRRC equipment.

10. The method for processing an eccentric bearing bush according to claim 1, characterized in that: The outer arc of the eccentric bearing is ground using the second vehicle fixture on the external grinding equipment to achieve the preset dimensional accuracy, cylindricity and roughness requirements, including: After positioning the eccentric bearing bush using the inner arc and side surface on the external grinding equipment, the outer arc of the eccentric bearing bush is ground using the second vehicle fixture to achieve the preset dimensional accuracy, cylindricity and roughness requirements.

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