Part fine grinding device and cylindrical grinding machine with same

Abstract

This utility model relates to a precision grinding device, specifically a precision grinding device for parts and an external cylindrical grinding machine incorporating the precision grinding device. It addresses the technical problems of external cylindrical grinding machines grinding the end face of parts using the side of the grinding wheel, resulting in low efficiency, high wear and short lifespan of lubrication components, high maintenance costs, and machining accuracy easily affected by the flatness of the two sides of the grinding wheel and the perpendicularity between the two sides and the axis of rotation. Furthermore, the grinding wheel is prone to damage, and the heat generated at the contact point between the grinding wheel and the end face of the part can easily burn and crack the part. This utility model includes a base, a motor, a drive shaft, an end cover, and a fixing assembly. The base is detachably fixed to the worktable of the external cylindrical grinding machine. The motor is fixedly mounted on the base, and the drive shaft is rotatably mounted on the base, with its rotation axis horizontally positioned. The input end of the drive shaft is connected to the output end of the motor via a transmission mechanism, and the output end is fixedly connected to the end cover. The fixing assembly is located on the end cover and is used to fix the part to be processed onto the end cover.

Description

Technical Field

[0001] This utility model relates to an external cylindrical grinding machine, specifically to a part fine grinding device and an external cylindrical grinding machine having the part fine grinding device. Background Technology

[0002] Grinding machines, as key equipment in the field of mechanical manufacturing, are high-precision machine tools specifically designed for machining the end faces, outer diameters, and inner holes of workpieces. Their working principle involves using a high-speed rotating grinding wheel to precisely grind the workpiece to achieve the required dimensional accuracy and surface quality. Due to this characteristic, grinding machines have wide applications in key fields such as mechanical manufacturing, automotive manufacturing, aerospace, and energy.

[0003] Cylindrical grinding machines are the most widely used type of grinding machine. They generally include a bed, worktable, headstock, tailstock, grinding head, and grinding wheel, and are mainly used for machining the outer cylindrical surfaces and end faces of parts. Based on different machining accuracy requirements, cylindrical grinding machines can be divided into two types: general-purpose and precision. General-purpose cylindrical grinding machines can only meet general machining accuracy requirements and are suitable for most mechanical manufacturing fields. Precision cylindrical grinding machines, on the other hand, through high-precision control systems and high-quality grinding wheels and other key components, can achieve higher machining accuracy and surface quality, and are particularly suitable for fields with extremely high workpiece precision requirements, such as aerospace and precision instruments.

[0004] However, precision cylindrical grinding machines are mostly special-purpose grinding machines with a limited range of applications and a single type of workpiece they can process. Currently, they mainly grind by placing the side of the grinding wheel close to the workpiece surface, resulting in low grinding efficiency. Furthermore, the force exerted on the side of the grinding wheel leads to high wear, short lifespan, and high maintenance costs for lubrication components such as bearings. Moreover, grinding the end face of a workpiece with the side of the grinding wheel requires extremely high flatness of both sides and perpendicularity between the sides and the axis of rotation. If these requirements are not met, the machining accuracy of the workpiece will be affected. In addition, because the side of the grinding wheel has poor load-bearing capacity, it is easily damaged during grinding. Also, because the grinding wheel side and the end face of the workpiece are in surface contact during grinding, the large contact area can cause heat concentration at the contact point, easily leading to burns and cracks in the workpiece. Utility Model Content

[0005] The purpose of this utility model is to solve the technical problems in the prior art, where precision cylindrical grinding machines grind the end face of parts by bringing the side of the grinding wheel close to the workpiece surface. This results in low grinding efficiency, high wear and short life of lubrication components such as bearings, high maintenance costs, and the machining accuracy being easily affected by the flatness of the two sides of the grinding wheel and the perpendicularity between the two sides and the axis of rotation. The grinding wheel is also prone to damage, and the heat generated at the contact point between the side of the grinding wheel and the end face of the workpiece can easily burn the workpiece and cause cracks. Therefore, this utility model provides a precision grinding device for parts and a cylindrical grinding machine with a precision grinding device for parts.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A precision grinding device for parts, characterized by:

[0008] Includes base, motor, drive shaft, end cap, and fixing components;

[0009] The base is used to be detachably and fixedly mounted on the worktable of the external cylindrical grinding machine, and the top of the base is fixedly mounted with a motor base and a mounting bracket;

[0010] The motor is fixedly mounted on the motor base;

[0011] The drive shaft is rotatably mounted on the mounting bracket, and the axis of rotation of the drive shaft is set horizontally;

[0012] The input end of the drive shaft is connected to the output end of the motor through a transmission mechanism, and the output end of the drive shaft is fixedly connected to the end cover.

[0013] The fixing component is located on the side of the end cover away from the drive shaft and is used to fix the part to be processed on the end cover.

[0014] Furthermore, the base includes a lower base plate, an upper base plate, and an angle adjustment mechanism;

[0015] The bottom plate is used for detachable fixing on the worktable of the external cylindrical grinding machine;

[0016] The upper base plate is rotatably mounted above the lower base plate, and the motor base and mounting bracket are both fixedly mounted on the top of the upper base plate;

[0017] An angle adjustment mechanism is located between the lower base plate and the upper base plate to lock the relative position of the upper base plate and the lower base plate.

[0018] Furthermore, a stepped shaft is fixedly connected to the bottom of the upper base plate, and a stepped hole is provided at the top of the lower base plate, with the stepped shaft rotatably positioned within the stepped hole;

[0019] The angle adjustment mechanism includes a locking screw, an arc-shaped screw hole on the upper base plate, and a threaded hole on the upper surface of the lower base plate. The axes of the two arc-shaped screw holes coincide with the axis of the stepped shaft. The locking screw passes through the arc-shaped screw hole and connects to the threaded hole.

[0020] Furthermore, the stepped shaft and the upper base plate are integrated; the lower base plate is used to fix the machine table of the external cylindrical grinding machine with screws; a mounting plate is fixedly installed on the top of the base, and the mounting bracket is fixedly mounted on the mounting plate; the drive shaft is rotatably connected to the mounting bracket through a pair of bearings.

[0021] Furthermore, the transmission mechanism includes a motor output pulley, an input pulley, and a synchronous belt. The motor output pulley is mounted on the output end of the motor, the input pulley is mounted on the input end of the transmission shaft, and the synchronous belt is sleeved between the motor output pulley and the input pulley.

[0022] Furthermore, a positioning surface is provided on the end face of the end cover away from the drive shaft, which is used to abut against the end face of the part to be processed; the fixing assembly includes a pressure cover and a fixing screw, the pressure cover is used to press the part to be processed, and the fixing screw passes through the pressure cover and connects to the end cover.

[0023] Furthermore, the motor is a variable frequency motor.

[0024] Furthermore, the motor's outer casing is equipped with a protective cover, which is fixedly connected to the base.

[0025] Meanwhile, this utility model also provides an external cylindrical grinding machine with a parts fine grinding device, including a worktable, a headstock, a tailstock, a grinding head, and a grinding wheel. The headstock and tailstock are respectively located at both ends of the worktable, the grinding head is located on one side of the worktable, and the grinding wheel is mounted on the spindle of the grinding head; its special feature is:

[0026] It also includes the aforementioned parts grinding device, which is used to mount the parts to be processed and drive them to rotate so as to grind the parts to be processed using the outer diameter of the grinding wheel;

[0027] The base is detachably fixed on the workbench and located between the headstock and the tailstock;

[0028] The rotation axis of the drive shaft is set perpendicular to the rotation axis of the grinding wheel.

[0029] Furthermore, let H1 be the height difference between the rotation axis of the drive shaft and the lower surface of the base, and H2 be the height difference between the rotation axis of the grinding wheel and the upper surface of the worktable. Then, H1 = H2.

[0030] The advantages of this utility model compared to the prior art are:

[0031] 1. The present invention relates to a parts fine grinding device and an external cylindrical grinding machine having the parts fine grinding device. The parts fine grinding device includes a base, a motor, a transmission shaft, a transmission mechanism, a mounting bracket, an end cover, and a fixing assembly. It is used to mount the parts to be processed and drive them to rotate, so as to use the outer cylindrical grinding wheel on the external cylindrical grinding machine to grind the parts to be processed. This can avoid the flatness error of the two sides of the grinding wheel itself and the perpendicularity error of the two sides to the axis of rotation when grinding the parts to be processed surface by surface grinding. At the same time, it can also avoid the flatness problem of the workpiece caused by the difference in the linear speed and the wear degree of the inner and outer surfaces of the grinding wheel. The surface grinding method can better ensure the machining accuracy of the parts. In addition, the contact surface of the parts to be processed is small when using the external cylindrical grinding wheel to grind the parts to be processed, which makes it less likely for heat to concentrate, the parts are less likely to be burned or cracked, and it is also conducive to chip removal.

[0032] 2. The external cylindrical grinding machine with a parts fine grinding device of this utility model sets the rotation axis of the transmission shaft to be perpendicular to the rotation axis of the grinding wheel on the external cylindrical grinding machine, so that the outer circle of the grinding wheel grinds the end face of the part to be processed. The external cylindrical grinding speed is fast, the load-bearing capacity is greater, and the grinding wheel contacts the surface of the part with its entire outer circle, which is not easy to wear.

[0033] 3. The precision grinding device for parts and the external cylindrical grinding machine with the precision grinding device of this utility model can adjust the angular position of the rotation axis of the part to be processed by setting a lower base plate, an upper base plate and an angle adjustment mechanism, so that the ordinary external cylindrical grinding machine can realize the processing of special parts such as conical and stepped parts;

[0034] 4. The precision grinding device for parts and the external cylindrical grinding machine with the precision grinding device of this utility model, by setting end caps, pressure caps and fixing screws, uses the inner hole and end face of the part to be processed for positioning. The positioning method is simple, which can reduce the labor intensity of operators, improve production efficiency, and is suitable for medium-scale production environments.

[0035] 5. In the precision grinding device for parts and the cylindrical grinding machine with the precision grinding device for parts of this utility model, the transmission mechanism adopts synchronous belt drive. The synchronous belt is elastic, which can buffer impact and vibration, has high transmission stability and low noise. Moreover, the synchronous belt drive has overload protection, which can prevent damage to the parts to be processed during the processing. In addition, the synchronous belt drive does not require lubricating oil, which can reduce dust and grease adsorption during the grinding process and make maintenance convenient.

[0036] 6. In the precision grinding device for parts and the cylindrical grinding machine with the precision grinding device for parts of this utility model, the motor is a variable frequency motor, and the speed can be adjusted according to the size, material and other properties of the parts to be processed, thereby improving the grinding accuracy of the parts surface. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of an external cylindrical grinding machine with a parts precision grinding device according to the present invention;

[0038] Figure 2 This is a top view of an embodiment of a precision grinding device for parts according to the present invention;

[0039] Figure 3 This is a cross-sectional structural schematic diagram of an embodiment of a parts precision grinding device according to the present invention.

[0040] The annotations in the attached figures are explained as follows:

[0041] 10-Worktable, 20-Headstock, 30-Tailstock, 40-Grinding head, 50-Grinding wheel, 60-Parts fine grinding device;

[0042] 1-Base, 11-Lower base plate, 111-Threaded hole, 112-Stepped hole, 12-Upper base plate, 121-Arc-shaped screw hole, 122-Stepped shaft, 2-Angle adjustment mechanism, 21-Locking screw, 3-Motor, 31-Motor base, 4-Transmission mechanism, 41-Motor output pulley, 42-Input pulley, 43-Synchronous belt, 5-Mounting bracket, 51-Mounting plate, 6-Drive shaft, 7-End cover, 8-Pressure cover, 9-Fixing screw. Detailed Implementation

[0043] To make the objectives, advantages and features of this utility model clearer, the following describes in further detail, with reference to the accompanying drawings and specific embodiments, a parts fine grinding device and an external cylindrical grinding machine having the parts fine grinding device proposed by this utility model.

[0044] Reference Figure 1 The present invention relates to an external cylindrical grinding machine with a parts fine grinding device, comprising a worktable 10, a headstock 20, a tailstock 30, a grinding head 40, a grinding wheel 50, and a parts fine grinding device 60. The headstock 20 and the tailstock 30 are respectively located at both ends of the worktable 10, the grinding head 40 is located on one side of the worktable 10, the grinding wheel 50 is mounted on the spindle of the grinding head 40, and the parts fine grinding device 60 is detachably fixed on the worktable 10 of the external cylindrical grinding machine for mounting the parts to be processed and driving them to rotate, so as to use the external cylindrical grinding of the parts to be processed by the grinding wheel 50.

[0045] like Figure 2 As shown, the parts grinding device 60 includes a base 1, a motor 3, a mounting bracket 5, a transmission shaft 6, an end cover 7, and a fixing assembly.

[0046] like Figure 1 and Figure 2 As shown, the base 1 is detachably fixed on the worktable 10 and located between the headstock 20 and the tailstock 30. A motor base 31 and a mounting plate 51 are fixedly mounted on the top of the base 1. The motor 3 is fixedly mounted on the motor base 31 with screws, and the mounting bracket 5 is fixedly mounted on the mounting plate 51 by welding. The drive shaft 6 is rotatably mounted on the mounting bracket 5, and the axis of rotation of the drive shaft 6 is horizontal. The drive shaft 6 is an independent unit, making parts easy to replace. To ensure smooth rotation of the drive shaft 6, it is rotatably connected to the mounting bracket 5 via a pair of bearings. When grinding the end face of the part, the axis of rotation of the drive shaft 6 is perpendicular to the axis of rotation of the grinding wheel 50.

[0047] To improve machining accuracy, the height difference between the rotation axis of the drive shaft 6 and the lower surface of the base 1 is defined as H1, and the height difference between the rotation axis of the grinding wheel 50 and the upper surface of the worktable 10 is defined as H2. Then, H1 = H2, so that the rotation axis of the drive shaft 6 and the rotation axis of the grinding wheel 50 are at the same height.

[0048] Motor 3 is a variable frequency motor, which can adjust its speed according to actual needs to handle the processing of parts made of different materials. The speed of motor 3 is matched with the spindle speed of the grinding head 40 on which the grinding wheel 50 is mounted, which can improve the grinding accuracy of the part surface. The outer cover of motor 3 is equipped with a protective cover, which is fixedly connected to the upper base plate 12 of base 1 by screws. The protective cover is used to prevent cutting fluid, cutting chips and other contaminants from entering motor 3, thus protecting motor 3.

[0049] like Figure 2 and Figure 3 As shown, the input end of the drive shaft 6 is connected to the output end of the motor 3 via the transmission mechanism 4. The transmission mechanism 4 includes a motor output pulley 41, an input pulley 42, and a synchronous belt 43. The motor output pulley 41 is mounted on the output end of the motor 3, the input pulley 42 is mounted on the input end of the drive shaft 6, and the synchronous belt 43 is sleeved between the motor output pulley 41 and the input pulley 42. The use of synchronous belt drive in the transmission mechanism can reduce transmission errors and improve transmission efficiency. Furthermore, the synchronous belt is elastic, which can buffer impacts and vibrations, resulting in high transmission smoothness and low noise. Synchronous belt drive also has overload protection, preventing damage to the workpiece during processing. Additionally, synchronous belt drive does not require lubrication, reducing dust and grease adsorption during grinding and facilitating maintenance. In other embodiments, the transmission mechanism 4 can also employ other transmission structures such as gear transmission, depending on the actual processing requirements.

[0050] The output end of the drive shaft 6 is fixedly connected to the end cover 7, which can be fixed by welding, screw connection, or other methods. A positioning surface is provided on the end face of the end cover 7 away from the drive shaft 6, which abuts against the end face of the part to be processed. A fixing assembly is located on the side of the end cover 7 away from the drive shaft 6, used to fix the part to be processed onto the end cover 7. The fixing assembly includes a pressure cap 8 and a fixing screw 9. The pressure cap 8 is used to press the part to be processed, and the fixing screw 9 passes through the pressure cap 8 and connects to the end cover 7. When fixing the part to be processed, one end face of the part abuts against the positioning surface. The fixing screw 9 passes through the through hole on the pressure cap 8 and the inner hole on the part to be processed in sequence, and then connects to the end cover 7. Thus, the part to be processed is pressed tightly onto the end cover 7 under the action of the fixing screw 9 and the pressure cap 8. The above structure uses the inner hole and end face of the part to be processed for positioning. The positioning method is simple, reduces the labor intensity of operators, improves production efficiency, and is suitable for medium-sized production environments. In other embodiments, the fixing assembly can also use clamping or other methods to fix the part to be processed according to actual processing needs.

[0051] The angle between the rotation axis of the drive shaft 6 and the rotation axis of the grinding wheel 50 is adjustable, such as... Figure 1 , Figure 2 and Figure 3 As shown, the base 1 includes a lower base plate 11, an upper base plate 12, and an angle adjustment mechanism 2.

[0052] The lower base plate 11 is detachably fixed to the workbench 10 by screws. In other embodiments, the lower base plate 11 can also be fixedly connected to the workbench 10 by magnetic attraction or other means. The bottom of the upper base plate 12 is fixedly connected to a stepped shaft 122. The top of the lower base plate 11 is provided with a stepped hole 112. The stepped shaft 122 is rotatably disposed in the stepped hole 112, and the axis of the stepped shaft 122 extends in the vertical direction, so that the upper base plate 12 is rotatably disposed above the lower base plate 11. The stepped shaft 122 and the upper base plate 12 are an integral part, which can increase the stability of the structure. The motor base 31 and the mounting bracket 5 are both fixedly installed on the top of the upper base plate 12. Specifically, the motor base 31 and the mounting plate 51 are fixedly connected to the upper base plate 12 by screws.

[0053] An angle adjustment mechanism 2 is disposed between the lower base plate 11 and the upper base plate 12 to lock the relative position of the upper base plate 12 and the lower base plate 11. The angle adjustment mechanism 2 includes a locking screw 21, an arc-shaped screw hole 121 disposed on the upper base plate 12, and a threaded hole 111 disposed on the upper surface of the lower base plate 11. The axes of the two arc-shaped sides of the arc-shaped screw hole 121 coincide with the axis of the stepped shaft 122. The locking screw 21 passes through the arc-shaped screw hole 121 and connects to the threaded hole 111. When it is necessary to adjust the angle between the rotation axis of the drive shaft 6 and the rotation axis of the grinding wheel 50, loosen the locking screw 21 so that the lower surface of the head of the locking screw 21 is away from the upper surface of the upper base plate 12. Then, move the upper base plate 12 to change the angle between the rotation axis of the drive shaft 6 and the rotation axis of the grinding wheel 50. After the adjustment is completed, tighten the locking screw 21. The lower surface of the head of the locking screw 21 presses against the upper surface of the upper base plate 12, and the relative position of the upper base plate 12 and the lower base plate 11 can be locked by friction, thus fixing the operating angle. By rotating the upper base plate 12, the workpiece to be processed is rotated. After the reference of the workpiece to be processed is corrected, the locking screw 21 is tightened to perform efficient grinding, realize the precise positioning and grinding of conical parts, improve the processing flexibility, and achieve the grinding accuracy standard of 0.001mm for cylindrical parts, meeting diverse processing needs. Through the angle adjustment mechanism 2, the angle position of the rotation axis of the workpiece to be processed can be quickly adjusted to complete the processing of various special types of parts such as conical and stepped parts, thereby expanding the machine tool function and enabling ordinary cylindrical grinding machines to process special parts such as conical and stepped parts. In addition, the processing surface can be switched by rotating the upper base plate 12 during the processing, so as to achieve the one-time processing of the end face and the outer cylindrical surface, which helps to improve the processing accuracy.

[0054] When grinding the end face of a part, the part to be processed is pressed onto the end cover 7 using fixing screws 9 and pressure caps 8. Then, the locking screws 21 are loosened. By rotating the upper base plate 12, the angle between the rotation axis of the drive shaft 6 and the rotation axis of the grinding wheel 50 is adjusted. After the rotation axis of the drive shaft 6 is made perpendicular to the rotation axis of the grinding wheel 50 and the reference of the part to be processed is corrected, the locking screws 21 are tightened. At this time, the end face of the part to be processed is facing the grinding wheel 50. Then, the grinding wheel 50 is moved to align with the grinding wheel grinding position. The motor 3 and the external cylindrical grinding machine are started, and the grinding wheel 50 is fed. The end face of the part to be processed is ground using the external cylindrical grinding of the grinding wheel 50.

[0055] When machining the outer cylindrical surface of special parts such as steps and cones, the part to be machined is pressed onto the end cover 7 by fixing screws 9 and pressure caps 8. At this time, the axis of the part to be machined is coaxial with the rotation axis of the drive shaft 6. Then, loosen the locking screw 21, and adjust the angle between the rotation axis of the drive shaft 6 and the rotation axis of the grinding wheel 50 by rotating the upper base plate 12. After the angle between the rotation axis of the drive shaft 6 and the rotation axis of the grinding wheel 50 is equal to the half-apex angle of the outer cylindrical surface of the part to be machined, and after the reference of the part to be machined is corrected, tighten the locking screw 21. Then, move the grinding wheel 50 to align with the grinding wheel grinding position, start the motor 3 and the external cylindrical grinding machine, feed the grinding wheel 50, and use the outer cylindrical surface of the grinding wheel 50 to grind the outer cylindrical surface of the part to be machined.

[0056] The precision grinding device 60 is used as an accessory to an external cylindrical grinding machine. It uses the outer diameter of the grinding wheel 50 on the external cylindrical grinding machine to grind the workpiece. This avoids the flatness error of the two sides of the grinding wheel 50 itself and the perpendicularity error of the two sides to the axis of rotation when grinding the workpiece surface by surface. At the same time, it can also avoid the flatness problem of the workpiece caused by the difference in the linear speed and wear degree of the inner and outer surfaces of the grinding wheel. The line-to-surface method can better ensure the machining accuracy of the workpiece. Moreover, the contact area of ​​the workpiece surface when grinding the workpiece surface with the outer diameter of the grinding wheel 50 is small, which makes it less likely to generate heat concentration, and the workpiece is less likely to be burned or cracked, and it is also conducive to chip removal. In addition, when grinding the end face of the workpiece, the rotation axis of the drive shaft 6 is perpendicular to the rotation axis of the grinding wheel 50 on the external cylindrical grinding machine, so that the rotation axis of the grinding wheel 50 is perpendicular to the rotation axis of the workpiece. The external cylindrical grinding speed is high and the load-bearing capacity is greater. Moreover, the grinding wheel 50 contacts the workpiece surface with its entire outer diameter, which is less prone to wear.

[0057] The parts fine grinding device 60 is an independent structure, simple and compact, easy to disassemble and replace, and applicable to various processing scenarios. When used as an accessory for a cylindrical grinding machine, the semi-automatic cylindrical grinding machine reduces the operator's workload and improves production efficiency through partial automation, making it suitable for medium-sized production environments. The fully automatic cylindrical grinding machine, on the other hand, achieves full automation from workpiece loading and processing to unloading, significantly improving production efficiency and machining accuracy, making it suitable for large-scale, high-efficiency production environments.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the specific technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this utility model.

Claims

1. A precision grinding device for parts, characterized in that: It includes a base (1), a motor (3), a drive shaft (6), an end cap (7), and a fixing assembly; The base (1) is used to be detachably fixed on the worktable (10) of the external cylindrical grinding machine. The top of the base (1) is fixedly installed with a motor base (31) and a mounting bracket (5). The motor (3) is fixedly mounted on the motor base (31); The drive shaft (6) is rotatably mounted on the mounting bracket (5), and the axis of rotation of the drive shaft (6) is set horizontally; The input end of the drive shaft (6) is connected to the output end of the motor (3) through the transmission mechanism (4), and the output end of the drive shaft (6) is fixedly connected to the end cover (7); The fixing component is located on the side of the end cover (7) away from the drive shaft (6) and is used to fix the part to be processed on the end cover (7).

2. The precision grinding apparatus for parts according to claim 1, characterized in that: The base (1) includes a lower base plate (11), an upper base plate (12), and an angle adjustment mechanism (2); The lower base plate (11) is detachably fixed on the worktable (10) of the cylindrical grinding machine; The upper base plate (12) is rotatably disposed above the lower base plate (11), and the motor base (31) and the mounting bracket (5) are both fixedly installed on the top of the upper base plate (12); The angle adjustment mechanism (2) is located between the lower base plate (11) and the upper base plate (12) to lock the relative position of the upper base plate (12) and the lower base plate (11).

3. The precision grinding apparatus for parts according to claim 2, characterized in that: The bottom of the upper base plate (12) is fixedly connected to a step shaft (122), and the top of the lower base plate (11) is provided with a step hole (112). The step shaft (122) is rotatably disposed in the step hole (112). The angle adjustment mechanism (2) includes a locking screw (21), an arc-shaped screw hole (121) on the upper base plate (12), and a threaded hole (111) on the upper surface of the lower base plate (11). The axes of the two arc sides of the arc-shaped screw hole (121) coincide with the axis of the stepped shaft (122). The locking screw (21) passes through the arc-shaped screw hole (121) and connects to the threaded hole (111).

4. The precision grinding apparatus for parts according to claim 3, characterized in that: The stepped shaft (122) and the upper base plate (12) are an integral part; the lower base plate (11) is used to be fixedly connected to the worktable (10) of the external cylindrical grinding machine by screws; the top of the base (1) is fixedly installed with a mounting plate (51), and the mounting bracket (5) is fixedly set on the mounting plate (51); the transmission shaft (6) is rotatably connected to the mounting bracket (5) through a pair of bearings.

5. The precision grinding apparatus for parts according to any one of claims 1-4, characterized in that: The transmission mechanism (4) includes a motor output pulley (41), an input pulley (42), and a synchronous belt (43). The motor output pulley (41) is installed on the output end of the motor (3), the input pulley (42) is installed on the input end of the transmission shaft (6), and the synchronous belt (43) is sleeved between the motor output pulley (41) and the input pulley (42).

6. The precision grinding apparatus for parts according to any one of claims 1-4, characterized in that: The end cap (7) has a positioning surface on its end face away from the drive shaft (6), which is used to abut against the end face of the part to be processed; the fixing assembly includes a pressure cap (8) and a fixing screw (9), the pressure cap (8) is used to press the part to be processed, and the fixing screw (9) passes through the pressure cap (8) and connects to the end cap (7).

7. The precision grinding apparatus for parts according to any one of claims 1-4, characterized in that: The motor (3) is a variable frequency motor.

8. The precision grinding apparatus for parts according to any one of claims 1-4, characterized in that: The motor (3) has a protective cover on its outer casing, and the protective cover is fixedly connected to the base (1).

9. An external cylindrical grinding machine with a parts fine grinding device, comprising a worktable (10), a headstock (20), a tailstock (30), a grinding head (40), and a grinding wheel (50), wherein the headstock (20) and the tailstock (30) are respectively disposed at both ends of the worktable (10), the grinding head (40) is disposed on one side of the worktable (10), and the grinding wheel (50) is mounted on the spindle of the grinding head (40); characterized in that: It also includes a parts grinding apparatus (60) according to any one of claims 1-8, for mounting the parts to be processed and driving them to rotate, so as to grind the parts to be processed using the outer diameter of the grinding wheel (50); The base (1) is detachably fixed on the workbench (10) and located between the head frame (20) and the tailstock (30); The rotation axis of the drive shaft (6) is perpendicular to the rotation axis of the grinding wheel (50).

10. The cylindrical grinding machine with a part fine grinding device according to claim 9, characterized in that: Define the height difference between the rotation axis of the transmission shaft (6) and the lower surface of the base (1) as H1, and the height difference between the rotation axis of the grinding wheel (50) and the upper surface of the worktable (10) as H2, then H1 = H2.

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