Method for machining eccentric bearing shell

Abstract

The application discloses a processing method of eccentric bushing, effectively solves the problems of size deviation in the processing, the consistency of the size and shape of each part of the eccentric bushing cannot be ensured, and the accurate processing of sharp edges and notches, so that the requirements of the whole machine tool of the equipment and the market demand can be met. The application comprises the following steps: rough turning and finish turning of the raw material are carried out by using a turning tool on a turning machine, and the raw material is processed into the eccentric bushing with the specified size and shape; the turned eccentric bushing is milled on a milling machine by using a milling clamp and a saw blade milling cutter, is divided into multiple pieces, and is chamfered; notching milling is carried out on the two ends of the eccentric bushing by using a vertical milling cutter on a vertical milling machine; burrs of the eccentric bushing are removed, and the sharp edges on the eccentric bushing are chamfered; the straightness of the inner circular arc generatrix of the eccentric bushing is pressed and corrected by using a press and a bushing correction tool; and the eccentric bushing is tempered.

Description

Technical Field

[0001] This application relates to the field of bearing processing technology, and in particular to a processing method for eccentric bearings. Background Technology

[0002] Eccentric bearings are widely used in various mechanical equipment, especially in situations where precise control of the position and trajectory of rotating parts is required. However, the machining process of eccentric bearings is relatively complex and has extremely high requirements for machining accuracy and surface quality.

[0003] Existing methods for machining eccentric bearing bushes have many shortcomings. On the one hand, during the machining process of eccentric bearing bushes, dimensional deviations may occur in the raw materials during the rough and finish turning stages, affecting the accuracy of subsequent machining and assembly. On the other hand, in machining steps such as milling and drilling, existing machining methods cannot guarantee the consistency of the dimensions and shapes of the various parts of the eccentric bearing bush, as well as the precise machining of sharp edges and notches, thus failing to meet the requirements of equipment, machine tools, and market demands. Summary of the Invention

[0004] This application provides a method for processing eccentric bearing bushes to solve the above-mentioned technical problems.

[0005] This application provides a method for processing eccentric bearing bushes, including:

[0006] Using machining tools on CRRC equipment, the raw materials are rough and fine machined to produce eccentric bearings of specified dimensions and shapes;

[0007] Using a milling fixture and a saw blade milling cutter, the eccentric bearing bush after turning is milled on a universal milling machine, divided into multiple parts, and the sharp edges are chamfered.

[0008] The ends of the eccentric bearing bush are notched using a vertical milling machine with a vertical milling cutter;

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

[0010] The straightness of the inner arc generatrix of the eccentric bearing is formed and corrected by using a press and bearing correction tools.

[0011] Tempering treatment is performed on the eccentric bearing bush;

[0012] The inner arc of the eccentric bearing was semi-finished by using the first machining fixture and machining tool holder on the CRRC equipment.

[0013] Drilling is performed on eccentric bearings using drilling jigs and drill bits on vertical drilling equipment.

[0014] The outer arc of the eccentric bearing was semi-finished using a second vehicle fixture on the CRRC equipment.

[0015] The outer arc of the eccentric bearing is ground using a second automotive fixture on an external grinding machine to achieve the preset dimensional accuracy, cylindricity and roughness requirements;

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

[0017] The inner arc of the eccentric bearing is precision machined using the third machining fixture on the CRRC equipment to meet the preset dimensional tolerance and surface roughness requirements.

[0018] The outer arc of the eccentric bearing bush is ground using a grinding fixture on an external grinding machine to achieve the preset dimensional tolerance and roughness requirements, and to ensure that the parallelism of the generatrix of the inner and outer circles of the eccentric bearing bush and the straightness of the generatrix of the outer arc both meet the preset requirements.

[0019] The eccentric bearing was subjected to an oil boiling and conditioning treatment, and then cooled to room temperature with the oil after being kept at a certain temperature.

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

[0021] The outer arc of the eccentric bearing is rough and fine ground on a precision grinding machine using a grinding fixture to meet the overall requirements of the machine tool used by the eccentric bearing.

[0022] The eccentric bearing is chamfered, deburred, and rounded.

[0023] Optionally, roughing and finishing machining of the raw material using machining tools on CRRC equipment to produce eccentric bearings of specified dimensions and shapes includes:

[0024] In the process of using a lathe tool on a CRRC machine to perform rough and fine machining on the raw material and make it into an eccentric bearing bush of specified size and shape, the coaxiality and straightness of the inner hole and outer circle of the eccentric bearing bush are both 0.03, and the perpendicularity of the two end faces of the eccentric bearing bush to the hole is 0.03.

[0025] Optionally, a semi-finish turning process is performed on the inner arc of the eccentric bearing using a first machining fixture and a machining tool holder on a CRRC machine, including:

[0026] When the inner arc of the eccentric bearing is semi-finished using the first machining fixture and machining tool holder on the CRRC equipment, the inner arc of the eccentric bearing is checked by 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 the first preset value.

[0027] Optionally, the inner arc of the eccentric bearing can be precision machined using a third machining fixture on CRRC equipment, including:

[0028] When the inner arc of the eccentric bearing is precision machined using the third car fixture on the CRRC equipment, 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 the second preset value.

[0029] Optionally, the eccentric bearing is subjected to an oil boiling and conditioning treatment, followed by heat treatment and cooling to room temperature with the oil, including:

[0030] The eccentric bearing was subjected to an oil boiling treatment. The oil boiling temperature was the third preset value. The temperature was maintained for several hours, and then cooled to room temperature with the oil.

[0031] Optionally, drilling of the eccentric bearing is performed on a vertical drilling machine using a drilling rig and a drill bit, including:

[0032] Drilling is performed on eccentric bearings using drilling jigs and flat bottom drill bits on vertical drilling equipment.

[0033] Optionally, after roughing and finishing the raw material using machining tools on a CRRC machine to produce eccentric bearings of specified dimensions and shapes, the method further includes:

[0034] The eccentric bearing bush is chamfered.

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

[0036] Remove the burrs from the eccentric bearing and chamfer all sharp edges on the eccentric bearing at a preset angle.

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

[0038] After positioning the eccentric bearing using the inner arc and side of the eccentric bearing on the CRRC equipment, the outer arc of the eccentric bearing is semi-finished using a second machining fixture on the CRRC equipment.

[0039] Optionally, the outer arc of the eccentric bearing bush is ground using a second machining fixture on an external grinding machine to achieve preset dimensional accuracy, cylindricity, and surface roughness requirements, including:

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

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

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

[0043] 2. The tempering and oil boiling treatment processes included in the manufacturing process help eliminate internal stress and defects in the eccentric bearing, enhance its performance and stability, and enable it to better resist wear, corrosion and deformation during use, thus extending its service life.

[0044] 3. This processing method involves multiple steps from raw material processing to eccentric bearing bush production, including turning, milling, drilling, grinding, and other processing methods, as well as detailed processing steps such as scraping and chamfering. This allows the processing method to flexibly meet the processing needs of eccentric bearing bushes of different specifications, shapes, and requirements. It effectively solves problems such as dimensional deviations during processing, inability to guarantee the consistency of the dimensions and shapes of various parts of the eccentric bearing bush, and the precise processing of sharp edges and notches. Thus, it can meet the requirements of the equipment and machine tools as well as market demands. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of an embodiment of the processing method for the eccentric bearing bush of this application. Detailed Implementation

[0046] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0047] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0048] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0049] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0050] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] Existing eccentric bearing manufacturing methods have many shortcomings. On the one hand, during the eccentric bearing manufacturing process, dimensional deviations may occur in the raw materials during the rough and finish turning stages, affecting the accuracy of subsequent processing and assembly. On the other hand, in milling and drilling processes, existing manufacturing methods cannot guarantee the consistency of the dimensions and shapes of the various parts of the eccentric bearing, as well as the precise machining of sharp edges and notches. As a result, existing eccentric bearing manufacturing methods are unable to produce eccentric bearings that meet the requirements of machine tools and market demands.

[0052] Based on this, this application provides a processing method for eccentric bearing bushes, which can effectively solve problems such as dimensional deviations during processing, inability to guarantee the consistency of the dimensions and shapes of various parts of the eccentric bearing bushes, and precise processing of sharp edges and notches, thereby meeting the requirements of equipment and machine tools and market demands.

[0053] It should be noted that the eccentric bearings manufactured by the eccentric bearing processing method of this application are preferably used on centerless grinding machines, but can also be used on other grinding machines, without specific limitations.

[0054] Please see Figure 1 This application provides a method for processing an eccentric bearing, comprising:

[0055] 101. Using machining tools on CRRC equipment, rough and fine machining is performed on raw materials to produce eccentric bearings of specified dimensions and shapes;

[0056] 102. Using a milling fixture and saw blade milling cutter, the eccentric bearing bush after turning is milled on a universal milling machine, divided into multiple parts, and the sharp edges are chamfered.

[0057] 103. Use a vertical milling cutter on a vertical milling machine to notch both ends of the eccentric bearing bush;

[0058] 104. Remove burrs from the eccentric bearing and chamfer all sharp edges on the eccentric bearing;

[0059] 105. The straightness of the inner arc generatrix of the eccentric bearing is formed and corrected by using a press and bearing correction tools;

[0060] 106. Temper the eccentric bearing;

[0061] 107. Using the first machining fixture and machining tool holder on the CRRC equipment, perform semi-finish turning of the inner arc of the eccentric bearing;

[0062] 108. Drilling eccentric bearings using drilling jigs and drill bits on vertical drilling equipment;

[0063] 109. The outer arc of the eccentric bearing is semi-finished by using the second machining fixture on the CRRC equipment;

[0064] 110. The outer arc of the eccentric bearing is ground on an external grinding machine using a second automotive fixture to achieve the preset dimensional accuracy, cylindricity and roughness requirements;

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

[0066] 112. The inner arc of the eccentric bearing is precision machined using the third machining fixture on the CRRC equipment to meet the preset dimensional tolerance and surface roughness requirements.

[0067] 113. Grinding fixtures are used on external grinding equipment to grind the outer arc of the eccentric bearing to achieve the preset dimensional tolerance and roughness requirements, and to ensure that the parallelism of the generatrices of the inner and outer circles of the eccentric bearing and the straightness of the generatrices of the outer arc both meet the preset requirements.

[0068] 114. The eccentric bearing is subjected to oil boiling and conditioning treatment, and then cooled to room temperature with the oil after heat preservation;

[0069] 115. The inner arc of the eccentric bearing is scraped to make the eccentric bearing meet the preset contact surface requirements;

[0070] 116. The outer arc of the eccentric bearing is rough and fine ground on a precision grinding machine using a grinding fixture to meet the overall requirements of the machine tool used by the eccentric bearing.

[0071] 117. Perform chamfering, deburring, and rounding treatment on the eccentric bearing.

[0072] In this embodiment, the raw material is first roughed and finished using a lathe tool on a trolley to form eccentric bearings of specified dimensions and shapes. Then, using a milling fixture and saw blade cutter, the machined eccentric bearings are milled on a milling machine to separate them into multiple pieces. The sharp edges of the eccentric bearings are then chamfered. After chamfering, the ends of the eccentric bearings are notched using an end mill on a vertical milling machine. Burrs are then removed, and the sharp edges on the eccentric bearings are chamfered. After chamfering, the bearings are aligned using a press and bearing alignment machine. The straightness of the inner arc generatrix of the eccentric bearing is formed and corrected using a positive tool. The eccentric bearing is then tempered. After tempering, the inner arc of the eccentric bearing is semi-finished using a first lathe fixture and a lathe tool on a trolley. The eccentric bearing is then drilled using a drilling fixture and a drill bit on a vertical drilling machine. Next, the outer arc of the eccentric bearing is semi-finished using a second lathe fixture on a trolley. Finally, the outer arc of the eccentric bearing is ground using a second lathe fixture on an external grinding machine to achieve the preset dimensional accuracy, cylindricity, and surface roughness requirements.

[0073] Next, the burrs on the eccentric bearing are removed again, and the sharp edges are chamfered. Then, the inner arc of the eccentric bearing is precision turned using a third lathe fixture on a trolley. The outer arc of the eccentric bearing is ground using a grinding die on an external grinding machine. Then, the eccentric bearing is subjected to oil boiling and conditioning treatment. After being kept at a certain temperature, it is cooled to room temperature with the oil. The inner arc of the eccentric bearing needs to be scraped to make the eccentric bearing meet the preset contact surface requirements. Finally, the outer arc of the eccentric bearing is rough and fine ground using a grinding fixture on a precision grinding machine to meet the design and process requirements. Finally, the eccentric bearing is chamfered using a hand scraper, and then deburred and rounded using other equipment to obtain the finished eccentric bearing.

[0074] In step 101, the raw material is rough and finish machined using a turning tool on the CRRC equipment to make the raw material into an eccentric bearing of specified size and shape;

[0075] In this embodiment of the application, before preparing the eccentric bearing, the preparation should begin with the raw materials. First, a suitable metal raw material is selected, and then a blank of the eccentric bearing is made. The blank of the eccentric bearing is made by casting tin bronze material into a steel sleeve made of No. 15 steel using the centrifugal force of a centrifuge. It should be noted that, in addition to the metal raw materials described above, other metal raw materials can also be used for the metal raw materials used to make the blank of the eccentric bearing, and no specific limitation is made here.

[0076] The blank of the eccentric bearing is made of tin bronze and No. 15 steel to ensure that the eccentric bearing has sufficient wear resistance, corrosion resistance, ductility and toughness. Then, a lathe fixture is used to fix the raw material to ensure its stability during processing. The raw material is rough turned on the lathe with a lathe tool holder and a lathe tool to quickly remove excess material and get close to the design size. Then, the workpiece after rough turning is precision turned to finely adjust the size and shape. Finally, the eccentric bearing is chamfered to ensure that the initial outline of the eccentric bearing made from the raw material meets the design requirements.

[0077] It should be noted that when using machining tools on CRRC equipment to rough and finish machine the raw materials to make eccentric bearings of specified dimensions and shapes, the coaxiality and straightness of the inner hole and outer circle of the eccentric bearing are both 0.03, and the perpendicularity of the two end faces of the eccentric bearing to the hole is 0.03.

[0078] In step 102, the eccentric bearing bush after turning is milled on a universal milling machine using a milling fixture and a saw blade milling cutter, and is divided into multiple pieces, and the sharp edges are chamfered.

[0079] In this embodiment, a milling jig is used to fix the eccentric bearing with a preliminary outline to ensure that it will not move or deform during the milling process. Then, a saw blade milling cutter is used on a milling machine to mill the eccentric bearing, which is then divided into multiple individual pieces as required. After the cutting is completed, the edges of the divided pieces are further chamfered to remove sharp edges and reduce the risk of damage during use.

[0080] In step 103, the ends of the eccentric bearing are notched using a vertical milling cutter on a vertical milling machine;

[0081] In the embodiments of this application, the end milling machine can provide a stable machining 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 of the notches at both ends of the eccentric bearing. When notching the two ends of the eccentric bearing, the size, shape and position of the notches are ensured so that the notch milling meets the design requirements.

[0082] In step 104, the burrs on the eccentric bearing are removed, and the sharp edges on the eccentric bearing are chamfered.

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

[0084] This process involves removing burrs from the eccentric bearing and chamfering the sharp edges of the eccentric bearing at a 45° angle.

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

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

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

[0088] In the embodiments of this application, tempering is a process of heating the eccentric bearing to a certain temperature, holding it at that temperature for a period of time, and then slowly cooling it. Tempering helps to eliminate internal stress generated during 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, the inner arc of the eccentric bearing is semi-finished by using the first machining fixture and machining tool bar on the CRRC equipment.

[0090] In this embodiment, when performing turning on a CRRC machine, the first turning fixture is used as a guide, and the cutting speed of the turning tool bar and the feed rate are controlled by the CRRC machine's slide plate during the machining process. This enables the turning of the inner arc to ensure machining quality and efficiency. By using the first turning fixture to turn the inner arc of the eccentric bearing, the machining accuracy and surface quality of the inner arc can be effectively improved, ensuring the coordination between the inner arc and the overall design, and enhancing the practicality of the eccentric bearing.

[0091] It should be noted that when the inner arc of the eccentric bearing is machined on the CRRC equipment using the first machining fixture and machining tool holder, the inner arc of the eccentric bearing is checked by 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. The first preset value is preferably 15.9, but it can also be set to other values, which are not specifically limited here.

[0092] In step 108, a drilling jig and a drill bit are used on a vertical drilling machine to drill holes in the eccentric bearing bush;

[0093] In this embodiment of the application, the vertical drilling equipment can provide a stable drilling platform to ensure the accuracy of the drilling process. The drilling jig is used to fix the eccentric bearing and guide the drill bit to accurately enter the predetermined position. The eccentric bearing is drilled using the drilling jig and the flat bottom drill bit on the vertical drilling equipment.

[0094] Among them, drilling jigs and flat bottom drill bits are used on vertical drilling equipment to drill holes in eccentric bearing bushes.

[0095] In step 109, the outer arc of the eccentric bearing is semi-finished using a second machining fixture on the CRRC equipment.

[0096] In this embodiment, a second machining fixture is used on a roving machine to process the outer arc of the eccentric bearing bush, ensuring that the dimensions, shape, and surface quality of the eccentric bearing bush meet the processing requirements. It should be noted that when machining the outer arc of the eccentric bearing bush on the roving machine, cutting parameters such as cutting speed, feed rate, and depth of cut are controlled to ensure processing quality and efficiency.

[0097] The process involves using the inner arc and side of the eccentric bearing to position it on the CRRC equipment, and then using a second machining fixture to machine the outer arc of the eccentric bearing.

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

[0099] In this embodiment, the external grinding equipment provides a stable grinding platform to ensure the stability of the grinding process. The second vehicle fixture is used to clamp the eccentric bearing and plays a positioning role for the eccentric bearing. The grinding wheel on the external grinding equipment grinds the outer arc of the eccentric bearing 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] In this process, 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 automotive fixture on the external grinding equipment, achieving a cylindricity of 0.01 and a roughness of Ra3.2-Ra1.6.

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

[0102] In this embodiment of the application, after the outer arc grinding process in step 110 and the cylindricity and roughness of the eccentric bearing meet the requirements, the burrs generated during the grinding process are removed again using tools such as files or sandpaper, 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 is precision machined using a third machining fixture on the CRRC equipment to achieve the preset dimensional tolerance and surface roughness requirements.

[0104] In this embodiment of the application, the inner arc of the eccentric bearing is precision turned, which is a further precision turning of the inner arc based on the previous rough turning. By using a third turning fixture and tool, the inner arc is ensured to meet the preset dimensional tolerance requirements and surface roughness requirements.

[0105] When the inner arc of the eccentric bearing is precision machined using a car fixture on the CRRC equipment, 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. The second preset value is preferably 15.10, but it 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 on an external grinding machine using a grinding fixture to achieve the preset dimensional tolerance and roughness requirements, and to ensure that the parallelism of the generatrix of the inner and outer circles of the eccentric bearing and the straightness of the generatrix of the outer arc both meet the preset requirements.

[0107] In this embodiment, a grinding fixture and grinding tools are used on an external grinding machine to perform final grinding of 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 grinding, the eccentric bearing meets the preset dimensional tolerance and roughness requirements. The parallelism of the generatrices of the inner and outer circles of the eccentric bearing is required to be 0.02 within a length range of 150 mm, and the straightness of the generatrices of the outer arc is required to be 0.01.

[0108] In step 114, the eccentric bearing is subjected to an oil boiling and conditioning treatment, and then cooled to room temperature with the oil after being kept at a certain temperature.

[0109] In this embodiment of the application, after the outer arc of the eccentric bearing is ground, the eccentric bearing is subjected to an oil boiling and conditioning treatment, which is to immerse the eccentric bearing in heated oil, keep it at a certain temperature for a period of time, and then cool it to room temperature with the oil. The oil boiling and conditioning process helps to eliminate residual stress inside the material and improve the stability and durability of the eccentric bearing.

[0110] In this process, the eccentric bearing is subjected to an oil boiling treatment. The oil boiling temperature is a third preset value, and the temperature is maintained for several hours. After the maintenance, the bearing is cooled to room temperature with the oil. It should be noted that in this application, the preferred oil boiling temperature is 160°C and the maintenance time is 6 hours. However, in application, the oil boiling temperature and maintenance 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 to make the eccentric bearing meet the preset contact surface requirements.

[0112] In this embodiment, after the outer arc of the eccentric bearing reaches the required precision and surface quality, the inner arc of the eccentric bearing that has undergone precision machining is scraped to ensure that the eccentric bearing meets the preset assembly contact surface requirements.

[0113] In step 116, the outer arc of the eccentric bearing is rough and fine ground on a precision grinding machine using a grinding mold fixture to meet the overall requirements of the machine tool used by the eccentric bearing.

[0114] In this embodiment of the application, after the eccentric bearing has undergone 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 using a precision grinding machine to meet the overall requirements of the machine tool used for the eccentric bearing.

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

[0116] In this embodiment of the application, the eccentric bearing after the above processing is subjected to a final processing, namely, the eccentric bearing is chamfered by hand scraping, and the eccentric bearing is deburred and rounded by other tools to obtain the final processed eccentric bearing.

[0117] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for machining an eccentric bearing bush, characterized in that, include: Using machining tools on CRRC equipment, the raw materials are rough and fine machined to produce eccentric bearings of specified dimensions and shapes; Using a milling fixture and a saw blade milling cutter, the eccentric bearing bush after turning is milled on a universal milling machine, divided into multiple parts, and the sharp edges are chamfered. The ends of the eccentric bearing bush are notched using a vertical milling machine with a vertical milling cutter; Remove burrs from the eccentric bearing and chamfer all sharp edges on the eccentric bearing. The straightness of the inner arc generatrix of the eccentric bearing is formed and corrected by using a press and bearing correction tools. Tempering treatment is performed on the eccentric bearing bush; The inner arc of the eccentric bearing was semi-finished by using the first machining fixture and machining tool holder on the CRRC equipment. Drilling is performed on eccentric bearings using drilling jigs and drill bits on vertical drilling equipment. The outer arc of the eccentric bearing was semi-finished using a second vehicle fixture on the CRRC equipment. The outer arc of the eccentric bearing is ground using a second automotive fixture on an external grinding machine to achieve the preset dimensional accuracy, cylindricity and roughness requirements; Remove burrs from the eccentric bearing and chamfer the sharp edges; The inner arc of the eccentric bearing is precision machined using the third machining fixture on the CRRC equipment to meet the preset dimensional tolerance and surface roughness requirements. The outer arc of the eccentric bearing bush is ground using a grinding fixture on an external grinding machine to achieve the preset dimensional tolerance and roughness requirements, and to ensure that the parallelism of the generatrix of the inner and outer circles of the eccentric bearing bush and the straightness of the generatrix of the outer arc both meet the preset requirements. The eccentric bearing was subjected to an oil boiling and conditioning treatment, and then cooled to room temperature with the oil after being kept at a certain temperature. The inner arc of the eccentric bearing is scraped to make the eccentric bearing meet the preset contact surface requirements. The outer arc of the eccentric bearing is rough and fine ground on a precision grinding machine using a grinding fixture to meet the overall requirements of the machine tool used by the eccentric bearing. The eccentric bearing is chamfered, deburred, and rounded.

2. The processing method for eccentric bearing bushes according to claim 1, characterized in that, The process of roughing and finishing raw materials using machining tools on CRRC equipment to produce eccentric bearings of specified dimensions and shapes includes: In the process of using a lathe tool on a CRRC machine to perform rough and fine machining on the raw material and make it into an eccentric bearing bush of specified size and shape, the coaxiality and straightness of the inner hole and outer circle of the eccentric bearing bush are both 0.03, and the perpendicularity of the two end faces of the eccentric bearing bush to the hole is 0.

03.

3. The processing method for eccentric bearing bushes according to claim 1, characterized in that, The inner arc of the eccentric bearing is semi-finished using a first-stage machining fixture and a machining tool holder on CRRC equipment, including: When the inner arc of the eccentric bearing is semi-finished using the first machining fixture and machining tool holder on the CRRC equipment, the inner arc of the eccentric bearing is checked by 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 the first preset value.

4. The processing method for eccentric bearing bushes according to claim 1, characterized in that, The inner arc of the eccentric bearing is precision machined using a third-stage machining fixture on CRRC equipment, including: When the inner arc of the eccentric bearing is precision machined using the third car fixture on the CRRC equipment, 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 the second preset value.

5. The processing method for eccentric bearing bushes according to claim 1, characterized in that, The eccentric bearing undergoes an oil boiling and conditioning treatment, followed by heat treatment and cooling to room temperature with the oil, including: The eccentric bearing was subjected to an oil boiling treatment. The oil boiling temperature was the third preset value. The temperature was maintained for several hours, and then cooled to room temperature with the oil.

6. The processing method for eccentric bearing bushes according to claim 1, characterized in that, Drilling eccentric bearings using drilling jigs and drill bits on vertical drilling equipment includes: Drilling is performed on eccentric bearings using drilling jigs and flat bottom drill bits on vertical drilling equipment.

7. The machining method for eccentric bearing bushes according to claim 1, characterized in that, After roughing and finishing the raw material using machining tools on CRRC equipment to produce eccentric bearings of specified dimensions and shapes, the method further includes: The eccentric bearing bush is chamfered.

8. The machining method for eccentric bearing bushes according to claim 1, characterized in that, Remove burrs from the eccentric bearing and chamfer all sharp edges on the eccentric bearing, including: Remove the burrs from the eccentric bearing and chamfer all sharp edges on the eccentric bearing at a preset angle.

9. The processing method for eccentric bearing bushes according to claim 1, characterized in that, The outer arc of the eccentric bearing is semi-finished using a second machining fixture on CRRC equipment, including: After positioning the eccentric bearing using the inner arc and side of the eccentric bearing on the CRRC equipment, the outer arc of the eccentric bearing is semi-finished using a second machining fixture on the CRRC equipment.

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

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