Grinding wheel dresser

Abstract

The present invention discloses a grinding wheel dresser, comprising a motor and a mandrel driven by the motor, and also comprising two diamond rollers for dressing different types of grinding wheels, wherein the diamond rollers are coaxially fixed to the mandrel. An adjustment mechanism is provided on each of the two diamond rollers, and the adjustment mechanism is used to adjust the end faces of the diamond rollers so that the end faces of the diamond rollers are perpendicular to the axis of the mandrel. The present invention installs two diamond rollers for dressing different types of grinding wheels at the end of the mandrel, which can greatly increase the types of grinding wheels that can be dressed by the grinding wheel dresser, improve the adaptability of the grinding wheel dresser, and enhance the online dressing capability of the grinding wheel dresser. The present invention also discloses a method for installing a diamond roller on a grinding wheel dresser, and the rotation accuracy of the diamond is ensured by adjusting the top screw and the ball.

Description

Technical Field

[0001] The invention relates to the field of grinding wheel dressers, in particular to a grinding wheel dresser. Background Art

[0002] CNC grinding machines are machine tools that use grinding tools to grind the surface of workpieces through CNC technology. Most grinding machines use high-speed rotating grinding wheels for grinding. During the grinding process, the grinding wheel will inevitably wear out, and the shape of the worn grinding wheel will change, affecting the grinding of the workpiece. The grinding wheel dresser can dress the grinding wheel. Through the grinding of the diamond roller and the grinding wheel, the shape of the grinding wheel can be trimmed to a state that can continue to be used.

[0003] However, due to the different workpieces to be ground, the shapes of the grinding wheels are also different. Similarly, different types of diamond rollers are needed to dress different types of grinding wheels. In the grinding process, the grinder can replace different grinding wheels in the tool magazine according to the workpiece processing conditions. However, the grinding wheel dresser has only one diamond roller and can only dress a single type of grinding wheel. To dress multiple types of grinding wheels, only the diamond roller of the grinding wheel dresser can be replaced. The diamond roller needs to be replaced manually, which is not only time-consuming and labor-intensive, but also affects continuous processing and production. Summary of the invention

[0004] The invention provides a grinding wheel dresser which can dress various types of grinding wheels.

[0005] A grinding wheel dresser comprises a motor and a spindle driven by the motor, and also comprises two diamond rollers for dressing different types of grinding wheels, wherein the diamond rollers are coaxially fixed to the spindle;

[0006] The two diamond rollers are both provided with an adjustment mechanism, and the adjustment mechanism is used to adjust the end faces of the diamond rollers so that the end faces of the diamond rollers are perpendicular to the axis of the core shaft.

[0007] Furthermore, a frustum surface is provided at one end of the mandrel away from the motor, and the diamond roller is fixed on the frustum surface; the adjustment mechanism includes a ball and a top screw, an axial through hole is provided on the diamond roller, and a thread matching the top screw is provided at one end of the through hole close to the motor, one side of the ball is provided in one end of the through hole provided with the thread, and the other side of the ball rests on an adjustment end face, the adjustment end face is a rigid end face parallel to the frustum surface, the adjustment end face rotates with the mandrel, there is a gap between the adjustment end face and the end face of the diamond roller, an annular groove is provided on the adjustment end face, the cross section of the groove is V-shaped, the ball is pressed into the groove by the top screw, and the top screw adjusts the gap by pushing the ball toward the adjustment end face.

[0008] Furthermore, a labyrinth ring is provided between the core shaft and the bearing cover, and the adjustment end face is the end face of the labyrinth ring.

[0009] Further, the diamond roller includes a first diamond roller close to the motor and a second diamond roller away from the motor, a shoulder is provided between the frustum and the end face of the core shaft away from the motor, the shoulder is used for installation and positioning of the second diamond roller, the distance between the positioning end face of the shoulder and the frustum is greater than the installation thickness of the first diamond roller, a spacer is provided between the first diamond roller and the second diamond roller, and the adjustment end face is the end face of the spacer.

[0010] Furthermore, the diamond roller is provided with at least two groups of axial fixing holes, each group of the fixing holes includes at least two screws, screws pass through the fixing holes and fix the diamond roller on the frustum surface, and the two groups of the fixing holes are respectively used to fix two diamond rollers.

[0011] Furthermore, an airtight joint is provided on the bearing gland.

[0012] Furthermore, a locking nut is provided at the end of the mandrel, and the locking nut locks the diamond roller.

[0013] Furthermore, it also includes an adjustment bearing, which is installed on the end of the core shaft close to the motor through a bearing fixing seat, and the bearing fixing seat is fixed in the dresser housing through screws, and there is a radial gap between the bearing fixing seat and the dresser housing.

[0014] Furthermore, a wave spring is provided between the bearing fixing seat and the adjusting bearing, and the wave spring provides an axial preload force for the adjusting bearing.

[0015] A method for installing a diamond roller on the above-mentioned grinding wheel dresser comprises the following steps:

[0016] Pre-tighten the first diamond roller onto the mandrel;

[0017] Detecting the end face runout and radial runout of the first diamond roller, and adjusting the end face of the first diamond roller by pushing the ball with a push screw, so that the end face of the first diamond roller is perpendicular to the axis of the mandrel;

[0018] Tighten and install the first diamond roller;

[0019] Preload the second diamond roller onto the mandrel;

[0020] Detect the end face runout and radial runout of the second diamond roller, and adjust the end face of the second diamond roller by pushing the ball with a push screw so that the end face of the second diamond roller is perpendicular to the axis of the mandrel;

[0021] Install the second diamond roller securely.

[0022] The present invention provides a grinding wheel dresser, in which two diamond rollers for dressing different types of grinding wheels are installed at the end of a mandrel, which can greatly increase the types of grinding wheels that can be dressed by the grinding wheel dresser, improve the adaptability of the grinding wheel dresser, and enhance the online dressing ability of the grinding wheel dresser. The grinding machine replaces the grinding wheel through the tool magazine to grind the workpiece, and after the grinding wheel is worn, the grinding wheel dresser disclosed in the present invention is used to dress different types of grinding wheels. The dressed grinding wheel can continue to process the workpiece, and the entire processing process is continuous, avoiding the time delay of manually replacing the diamond roller and reducing the labor cost.

[0023] An adjustment bearing is added to the end of the core shaft close to the motor to make the rotation accuracy of the core shaft higher and improve the rigidity.

[0024] Since the mandrel length is short, the precision requirement for adjusting the mandrel bearing is not high, so a certain radial clearance is set between the bearing fixing seat and the dresser housing. The adjustment bearing and the original bearing of the grinding wheel dresser are installed in steps. The bearing fixing seat and the dresser housing are split structures, which shortens the processing length of the dresser housing, avoids processing errors when the processing cutter head processes long-distance processing surfaces, improves processing accuracy, reduces processing difficulty and assembly difficulty, and facilitates installation. During installation, since the bearing fixing seat and the dresser housing are fixedly connected by screws, there is a certain matching clearance between the screws and the screw holes. The installation matching position between the mandrel and the adjustment bearing can be adjusted through this matching clearance and the radial clearance between the bearing fixing seat and the dresser housing, so that the installation surface of the adjustment bearing on the bearing fixing seat does not require high processing accuracy, and the matching installation can be completed. The radial accuracy is adjusted by the matching clearance between the screw holes, and the axial preload is applied by the wave spring to ensure the rotation accuracy of the mandrel and will not cause stress on the mandrel.

[0025] The present invention also provides a method for installing a diamond roller, which adjusts the end face of the diamond roller by pushing the ball with a top screw, so that the end face of the diamond roller is perpendicular to the core shaft, controls the radial runout and end face runout of the diamond roller during high-speed rotation, and ensures the rotation accuracy of the diamond roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a structural schematic diagram of a grinding wheel dresser disclosed in the present invention;

[0028] Figure 2 yes Figure 1 A magnified view of part A;

[0029] Figure 3 yes Figure 2 Magnified view of part B.

[0030] Description of Figure Numbers:

[0031] 1. First diamond roller; 2. Second diamond roller; 3. Locking nut; 4. Ball; 5. Top screw; 6. Adjusting bearing; 7. Through hole; 8. Coupling; 9. Motor; 10. Bearing fixing seat; 11. Clearance; 12. Air sealing joint; 13. Wave spring; 14. Mandrel; 15. Dresser housing; 16. Bearing cover; 17. Labyrinth ring; 18. Groove; 19. Shoulder; 20. Spacer; 21. Fixing hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1-Figure 3 As shown, the method of this embodiment may include: a grinding wheel dresser, including a motor 9 and a spindle 14 driven by the motor, and also including two diamond rollers for dressing different types of grinding wheels, the diamond rollers are coaxially fixed with the spindle 14. Both diamond rollers are provided with an adjustment mechanism, the adjustment mechanism is used to adjust the end face of the diamond roller so that the end face of the diamond roller is perpendicular to the axis of the spindle 14.

[0034] In this embodiment, two groups of fixing holes 21 are provided on both diamond rollers, each group of fixing holes 21 includes three evenly distributed fixing holes 21 and six axially penetrating fixing holes 21, wherein the three fixing holes 21 on the first diamond roller are penetrated by screws to fix the first diamond roller 1 on the round table surface 141, and the three fixing holes on the second diamond roller 2 which are different from the above three fixing holes are penetrated by screws and penetrate the first diamond roller 1 to fix the second diamond roller 2 on the round table surface 141. There is no thread in the fixing hole, and the screw is installed in cooperation with the screw hole of the round table surface 141.

[0035] The diamond roller is provided with a through hole 7, and the wrench goes deep into the through hole to rotate the top screw 5, so that the ball 4 pushes against the labyrinth ring 17 or the spacer 20, and the angle of the end face of the diamond roller is adjusted to ensure the rotation accuracy of the diamond roller. In this embodiment, each diamond roller is respectively provided with three through holes, and the rotation accuracy of the diamond roller is adjusted by the cooperation of the three top screws and the balls.

[0036] Furthermore, it also includes an adjustment bearing 6, which is installed on the end of the core shaft 14 close to the motor through a bearing fixing seat 10. The bearing fixing seat 10 is fixed in the dresser housing 15 by screws, and there is a radial gap between the bearing fixing seat 10 and the dresser housing 15.

[0037] Each diamond roller can dress a type of grinding wheel. Two different diamond rollers can make the use of the grinding wheel dresser wider, avoid wasting time by manually replacing diamond rollers, and save manpower. However, adding one more diamond roller to the end of the grinding wheel dresser will increase the weight of the end of the grinding wheel dresser. When the grinding wheel dresser is working, the rotation speed is high. The increase in the weight of the end will affect the rotation accuracy of the grinding wheel dresser. In order to ensure the rotation accuracy of the grinding wheel dresser and improve the overall rigidity, an adjustment bearing 6 is added to the end of the mandrel 14 close to the motor to make the rotation of the mandrel 14 more stable.

[0038] To add bearings, it is necessary to process the mounting surface of the bearings. Under high-speed rotation conditions, the machining accuracy of the bearing mounting surface is very high. The machining cost of the high-precision mounting surface is also correspondingly high. In order to reduce costs, the mounting surface of the adjustment bearing 6 does not need to be processed with very high precision. The radial position of the adjustment bearing 6 can be adjusted during installation to compensate for small machining errors. The bearing fixing seat 10 is fixed in the dresser housing 15 by axial screws. There is a radial gap between the bearing fixing seat 10 and the dresser housing 15. During installation, ensure that the axis of the core shaft 14 is in the correct position. There is a certain installation gap between the screw and the screw hole. The installation position of the bearing fixing seat 10 is adjusted through this installation gap to compensate for the machining error. The radial gap between the bearing fixing seat 10 and the dresser housing 15 will not affect the adjustment of the bearing fixing seat 10 within the installation gap of the screw hole.

[0039] The length of the mandrel 14 in the grinding wheel dresser is relatively small, so the impact of adding a grinding wheel at the end of the mandrel 14 away from the motor on the mandrel 14 will be relatively small, which can be solved by adjusting the bearing 6. Moreover, two high-precision grinding wheels are installed at the end of the mandrel 14 away from the motor to ensure stable rotation of the mandrel and ensure accuracy.

[0040] Further, the diamond roller includes a flat diamond roller 1 and an arc-shaped diamond roller 2, and the flat diamond roller 1 and the arc-shaped diamond roller 2 are coaxially fixed by screws. The type and position of the diamond roller can be adjusted as needed.

[0041] Furthermore, a round table surface 141 is provided at one end of the mandrel 14 away from the motor, and the diamond roller is fixed on the round table surface 141 by screws. The mandrel 14 is a stepped shaft, and two diamond rollers are coaxially fixed on the round table surface 141 by fixing screws. Two diamond rollers with equal mounting holes can be installed on the same positioning shoulder, and two diamond rollers with different mounting holes can be installed on different positioning shoulders. A spacer is provided between the two diamond rollers to reduce the machining accuracy of the positioning shoulder on the mandrel 14 and compensate for the error of the thickness of the diamond rollers.

[0042] Furthermore, a locking nut 3 is provided at the end of the mandrel 14, and the locking nut 3 locks the diamond roller 2. The screws have fixed the two diamond rollers, and the locking nut 3 provides a second layer of fixation for the diamond rollers, further ensuring the reliability of the installation of the diamond rollers.

[0043] Furthermore, a wave spring 13 is provided between the bearing fixing seat 10 and the adjusting bearing 6, and the wave spring 13 provides an axial preload force for the adjusting bearing 6. The wave spring 13 performs adaptive preload force on the adjusting bearing 6, so that the adjusting bearing 6 always applies a preload force in the axial direction, thereby preventing the bearing from causing a decrease in accuracy during long-term operation.

[0044] Furthermore, the end of the mandrel 14 close to the motor is connected to the motor 9 through the coupling 8. The motor and the diamond roller are directly driven through the mandrel 14, which eliminates the problem of lost steps and low transmission efficiency due to large friction loss in the reducer or gear transmission. Synchronous belt transmission belongs to elastic transmission and cannot guarantee an accurate transmission ratio. The motor 9 is directly connected to the diamond roller through the coupling 8 and the mandrel 14, and the transmission efficiency is high.

[0045] Furthermore, a labyrinth ring 17 is provided between the mandrel 14 and the bearing gland 16, and a gas seal joint 12 is provided on the bearing gland 16. Gas is introduced into the cavity between the mandrel 14 and the dresser housing 15 through the gas seal joint 12, so that the gas pressure in the cavity is higher than the atmospheric pressure, and the gas always escapes from the cavity through the labyrinth ring 17 to the outside of the cavity, thereby preventing dust and fine chips from entering the cavity and causing the mandrel to reduce its accuracy during long-term operation, thereby improving the reliability of the grinding wheel dresser.

[0046] The method for installing a diamond roller on a grinding wheel dresser disclosed in the present invention comprises the following specific steps:

[0047] Pre-tighten and install the first diamond roller on the mandrel; three screws provide pre-tightening force to the first diamond roller, use a micrometer to detect the end face runout and radial runout of the first diamond roller, and adjust the end face of the first diamond roller by pushing the ball adjustment with a top screw, so that the end face of the first diamond roller is perpendicular to the axis of the mandrel; after determining that the rotation accuracy of the first diamond roller meets the requirements, tighten and install the first diamond roller;

[0048] Pre-tighten and install the second diamond roller on the core shaft; three screws provide pre-tightening force for the second diamond roller, use a micrometer to detect the end face runout and radial runout of the second diamond roller, and adjust the end face of the second diamond roller by pushing the ball adjustment with a top screw to make the end face of the second diamond roller perpendicular to the axis of the core shaft; after determining that the rotation accuracy of the second diamond roller meets the requirements, tighten and install the second diamond roller.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A grinding wheel dresser, comprising a motor (9) and a spindle (14) driven by the motor (9), characterized in that: It also includes two diamond rollers for dressing grinding wheels on different working surfaces, wherein the diamond rollers are coaxially fixed to the mandrel (14); Both diamond rollers are provided with an adjustment mechanism, the adjustment mechanism being used to adjust the end faces of the diamond rollers so that the end faces of the diamond rollers are perpendicular to the axis of the mandrel (14); The end of the core shaft (14) away from the motor (9) is provided with a round table surface (141), and the diamond roller is fixed on the round table surface (141); the adjustment mechanism comprises a ball (4) and a top screw (5); an axial through hole (7) is provided on the diamond roller, and an end of the through hole (7) close to the motor (9) is provided with a thread matching the top screw; one side of the ball (4) is arranged in the end of the through hole provided with the thread, and the other side of the ball (4) is against the adjustment end surface, so that The adjustment end surface is a rigid end surface parallel to the truncated table surface (141). The adjustment end surface rotates with the core shaft (14). A gap (11) is provided between the adjustment end surface and the end surface of the diamond roller. An annular groove (18) is provided on the adjustment end surface. The cross section of the groove (18) is V-shaped. The ball (4) is pressed into the groove (18) by the top screw (5). The top screw (5) adjusts the gap (11) by pushing the ball (4) toward the adjustment end surface.

2. The grinding wheel dresser according to claim 1, characterized in that: A labyrinth ring (17) is provided between the core shaft (14) and the bearing cover (16), and the adjustment end surface is the end surface of the labyrinth ring (17).

3. The grinding wheel dresser according to claim 1, characterized in that: The diamond roller comprises a first diamond roller (1) close to the motor (9) and a second diamond roller (2) away from the motor (9); a shoulder (19) is provided between the truncated table surface (141) and an end surface of the mandrel away from the motor (9); the shoulder (19) is used for mounting and positioning the second diamond roller (2); the distance between the positioning end surface of the shoulder (19) and the truncated table surface (141) is greater than the mounting thickness of the first diamond roller (1); a spacer sleeve (20) is provided between the first diamond roller (1) and the second diamond roller (2); and the adjustment end surface is the end surface of the spacer sleeve (20).

4. The grinding wheel dresser according to claim 1, characterized in that: The diamond roller is provided with at least two groups of axial fixing holes (21), each group of the fixing holes (21) comprises at least two screws, screws pass through the fixing holes (21) and fix the diamond roller on the round table surface (141), and the two groups of fixing holes (21) are respectively used to fix two diamond rollers.

5. The grinding wheel dresser according to claim 2, characterized in that: The bearing gland (16) is provided with a gas-sealing joint (12).

6. The grinding wheel dresser according to any one of claims 1 to 5, characterized in that: A locking nut (3) is provided at the end of the mandrel (14), and the locking nut (3) locks the diamond roller (2).

7. The grinding wheel dresser according to claim 1, characterized in that: It also includes an adjustment bearing (6), the adjustment bearing (6) being mounted on an end of the spindle (14) close to the motor (9) via a bearing fixing seat (10), the bearing fixing seat (10) being fixed in a dresser housing (15) via screws, and a radial gap being present between the bearing fixing seat (10) and the dresser housing (15).

8. The grinding wheel dresser according to claim 7, characterized in that: A wave spring (13) is provided between the bearing fixing seat (10) and the adjusting bearing (6), and the wave spring (13) provides an axial preload force for the adjusting bearing (6).

9. A method for installing a diamond roller on a grinding wheel dresser according to any one of claims 2 to 5, characterized in that: The following steps are involved: Pre-tighten the first diamond roller onto the mandrel; Detecting the end face runout and radial runout of the first diamond roller, and adjusting the end face of the first diamond roller by pushing the ball with a push screw, so that the end face of the first diamond roller is perpendicular to the axis of the mandrel; Tighten and install the first diamond roller; Preload the second diamond roller onto the mandrel; Detect the end face runout and radial runout of the second diamond roller, and adjust the end face of the second diamond roller by pushing the ball with a push screw so that the end face of the second diamond roller is perpendicular to the axis of the mandrel; Install the second diamond roller securely.

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