High-precision horizontal compound grinding machine

Abstract

The application discloses a high-precision horizontal composite grinding machine, which comprises an outer circle grinding wheel assembly, an inner circle grinding wheel assembly, a grinding wheel frame and a B-axis turret, the outer circle grinding wheel assembly is connected with the grinding wheel frame, and the inner circle grinding wheel assembly is connected with the grinding wheel frame; the B-axis turret comprises a box body, a B-axis shaft core, a rotary table bearing and a single-row cylindrical roller bearing, the B-axis shaft core is connected with the grinding wheel frame, the B-axis shaft core is rotatably arranged in the box body, the rotary table bearing and the single-row cylindrical roller bearing are both arranged in the box body, the rotary table bearing is connected with one end of the B-axis shaft core to limit and support the B-axis shaft core, the single-row cylindrical roller bearing is connected with the other end of the B-axis shaft core to support the B-axis shaft core, and the centers of the outer circle grinding wheel assembly and the inner circle grinding wheel assembly are coplanar and coincide with the center of the outer ring thickness of the rotary table bearing. The high-precision horizontal composite grinding machine has the advantages that the high-precision horizontal composite grinding machine realizes high precision of the B-axis turret, improves the positioning precision of the B-axis turret, and realizes high rigidity and high reliability of the structure of the B-axis turret.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of grinding technology of external cylindrical grinding machine, and more particularly to a high-precision horizontal compound grinding machine. BACKGROUND

[0002] With the development of science and technology and the impetus of productivity, the machining precision of mechanical products is higher and higher, and the demand for surface roughness is lower and lower, which makes the grinding machine play a more and more important role in various departments of the national economy.

[0003] In recent years, with the rapid development and popularization of high-efficiency grinding technology and compound grinding technology, the grinding machining process has gradually changed from single grinding machining process to compound grinding machining process, such as the horizontal compound grinding machine which has the functions of external cylindrical grinding, internal cylindrical grinding, thread grinding, end face grinding, non-circular grinding and other machining capabilities, and is suitable for single and batch grinding of medium-sized machining applications. Such compound grinding machines are highly compatible with high-precision machining requirements of shaft cores, hydraulic valve cores, motor shafts, precision speed reducers, precision flanges, and differentials, and are suitable for various clamping and positioning methods and multiple wheel combinations. Such multi-process and multi-functional combined compound grinding machines have achieved very good market benefits. Therefore, it is particularly important to improve the high precision, high rigidity and high reliability of the B-axis turning position angle of the compound grinding machine. There are mainly the following structures of B-axis in the market:

[0004] ① Mouse disc type B-axis indexing structure, but the mouse disc type B-axis structure cannot realize stepless indexing of the B-axis, and cannot better meet the requirements of the diversification of products in today's rapidly changing world. At the same time, most of the mouse disc type B-axis structure is manually adjusted or semi-automatically adjusted, and it is not easy to realize automatic control and automatic compensation.

[0005] ② B-axis indexing structure driven by a servo motor and a worm and gear, but the B-axis structure of the worm and gear is complex. The B-axis structure of the worm and gear structure is prone to insufficient rigidity of the grinding wheel part during grinding due to the backlash of the worm pair, which may cause vibration and affect the grinding quality of the workpiece.

[0006] Therefore, how to improve the high precision and high rigidity of the B-axis turning position angle of the compound grinding machine is a problem that needs to be solved at present. SUMMARY

[0007] The purpose of the present application is to provide a high-precision horizontal compound grinding machine. The high-precision horizontal compound grinding machine provided by the present application can not only realize high precision of the B-axis turret, improve the rotational positioning accuracy and repeatability of the B-axis turret, but also realize high rigidity and high reliability of the B-axis turret structure.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] A high-precision horizontal compound grinding machine, comprising: an external grinding wheel assembly, an internal grinding wheel assembly, a grinding wheel frame, and a B-axis turret;

[0010] The outer grinding wheel assembly is connected to the grinding wheel frame, and the inner grinding wheel assembly is connected to the grinding wheel frame;

[0011] The B-axis turret includes a housing, a B-axis core shaft, a turntable bearing and a single-row cylindrical roller bearing. The B-axis core shaft is connected to the grinding wheel frame. The B-axis core shaft is rotatably arranged in the housing and the turntable bearing and the single-row cylindrical roller bearing are both arranged in the housing. The turntable bearing is connected to one end of the B-axis core shaft to limit and support the B-axis core shaft. The single-row cylindrical roller bearing is connected to the other end of the B-axis core shaft to support the B-axis core shaft. The centers of the outer cylindrical grinding wheel assembly and the inner cylindrical grinding wheel assembly are coplanar and coincide with the center plane of the outer ring thickness of the turntable bearing.

[0012] Preferably, the B-axis turret further includes a torque motor and a detection and positioning assembly;

[0013] The torque motor is arranged in the housing and located between the turntable bearing and the single-row cylindrical roller bearing. The detection and positioning assembly is arranged in the housing and located below the B-axis core shaft to detect and position the rotation angle of the B-axis core shaft.

[0014] Preferably, the detection and positioning assembly includes a circular grating and a locking disk;

[0015] The circular grating is arranged between the locking disk and the B-axis core shaft and is located below the B-axis core shaft. The locking disk is fixedly arranged in the box body to fix and lock the circular grating.

[0016] Preferably, a transfer core shaft is provided in the box body, the transfer core shaft is connected to the B-axis core shaft, and the circular grating is provided on the step surface of the transfer core shaft to detect and position the rotation angle of the B-axis core shaft.

[0017] Preferably, the B-axis turret further comprises a rear bearing seat, a bearing pressure cover and a labyrinth cover;

[0018] The rear bearing seat is arranged on the end face of the B-axis housing close to the single-row cylindrical roller bearing. The single-row cylindrical roller bearing is arranged in the mounting hole of the rear bearing seat. The bearing pressure cover is in contact with the single-row cylindrical roller bearing to press the single-row cylindrical roller bearing to support the B-axis core shaft. The labyrinth cover is arranged at the end of the single-row cylindrical roller bearing to seal the single-row cylindrical roller bearing.

[0019] Preferably, the torque motor comprises a stator and a rotor;

[0020] The stator is fixedly arranged on the inner wall of the box body, the rotor is arranged on the outer cylindrical surface of the B-axis mandrel, the B-axis turret is internally provided with a motor gland for positioning and locking the rotor and an adjusting pad for adjusting the position of the rotor, the motor gland is connected with the rotor, and the motor gland is connected with the stepped surface of the B-axis mandrel, and the adjusting pad is arranged between the motor gland and the rotor.

[0021] Preferably, the outer circular grinding wheel assembly comprises an outer circular grinding wheel and an outer circular spindle, and the inner circular grinding wheel assembly comprises an inner circular grinding wheel and an inner circular spindle;

[0022] The outer circular grinding wheel is connected with the grinding wheel frame through the outer circular spindle, the inner circular grinding wheel is connected with the grinding wheel frame through the inner circular spindle, and the centers of the outer circular spindle and the inner circular spindle are coplanar and coincide with the center plane of the outer ring thickness of the rotary table bearing.

[0023] The present application has the following advantages:

[0024] The high-precision horizontal compound grinding machine sets the B-axis mandrel between the single-row cylindrical roller bearing and the rotary table bearing, so that the B-axis mandrel can be limited and supported by the single-row cylindrical roller bearing and the rotary table bearing, thereby reducing the deformation degree of the B-axis mandrel under stress, further improving the rigidity of the B-axis mandrel, avoiding vibration of the B-axis mandrel during grinding, and further improving the grinding quality of the workpiece. In addition, the structure that the centers of the outer circular spindle and the inner circular spindle are coplanar and coincide with the center plane of the outer ring thickness of the rotary table bearing minimizes the force arm of the grinding wheel assembly under stress, thereby reducing the stress moment of the rotary table bearing during regrinding, improving the rigidity of the rotary table bearing, and further improving the rigidity and reliability of the B-axis turret.

[0025] In addition, the setting of the circular grating enables precise positioning of the rotation angle of the B-axis mandrel after rotation, and the setting of the locking disc avoids the formation of gaps in the internal structure of the B-axis turret, achieving high-precision rotation, positioning and locking of the B-axis mandrel, and further ensuring high-precision rotation of the B-axis turret. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic view of the overall structure of the high-precision horizontal compound grinding machine of the present application;

[0027] Figure 2 is a schematic view of the structure of the B-axis turret of the high-precision horizontal compound grinding machine of the present application;

[0028] Figure 3The present invention is a schematic diagram of the layout of the outer cylindrical spindle, inner cylindrical spindle and turntable bearings of a high-precision horizontal compound grinding machine.

[0029] Description of reference numerals:

[0030] 1. External grinding wheel; 2. External spindle; 3. Internal spindle; 4. Internal grinding wheel; 5. Grinding wheel frame;

[0031] 6. B-axis turret; 601. B-axis mandrel; 602. Box gland; 603. Turntable bearing; 604. Torque motor; 605. Box; 606. Rear bearing seat; 607. Bearing gland; 608. Dust cover; 609. Circular grating; 610. Locking disk; 611. Labyrinth cover; 612. Adapter mandrel; 613. Transition flange; 614. Single-row cylindrical roller bearing; 615. Motor gland; 616. Adjustment pad;

[0032] 7. Workpiece. DETAILED DESCRIPTION

[0033] The following description sets forth numerous specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0034] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0036] like Figure 1 and Figure 2As shown, a high-precision horizontal compound grinding machine comprises: an outer cylindrical grinding wheel assembly 1, an inner cylindrical grinding wheel assembly 4, a grinding wheel frame 5, and a B-axis turret 6; the outer cylindrical grinding wheel assembly 1 is connected to the grinding wheel frame 5, and the inner cylindrical grinding wheel assembly 4 is connected to the grinding wheel frame 5; the B-axis turret 6 comprises a box 605, a B-axis core shaft, a turntable bearing 603, and a single-row cylindrical roller bearing 614; the B-axis core shaft is connected to the grinding wheel frame 5, and the B-axis core shaft is connected to the grinding wheel frame 5. The turntable bearing 603 and the single-row cylindrical roller bearing 614 are rotatably arranged in the box body 605. The turntable bearing 603 is connected to one end of the B-axis core shaft to limit the support of the B-axis core shaft. The single-row cylindrical roller bearing 614 is connected to the other end of the B-axis core shaft to support the B-axis core shaft. The centers of the outer cylindrical grinding wheel 1 assembly and the inner cylindrical grinding wheel 4 assembly are coplanar and coincide with the center plane of the outer ring thickness of the turntable bearing 603.

[0037] In this embodiment, the B-axis axis is a vertical axis. This high-precision horizontal composite grinding machine positions the B-axis spindle 601 between a single-row cylindrical roller bearing 614 and a turntable bearing 603, allowing the B-axis spindle to be limited and supported by the single-row cylindrical roller bearing 614 and the turntable bearing 603. This minimizes deformation of the B-axis spindle 601 under stress, further improving the rigidity of the B-axis spindle 601, preventing vibration of the B-axis spindle 601 during grinding, and further improving the grinding quality of the workpiece 7. Furthermore, the structural arrangement in which the centers of the outer spindle 2 and the inner spindle 3 are coplanar and coincide with the center plane of the outer ring thickness of the turntable bearing 603 minimizes the force arm of the grinding wheel assembly during grinding, thereby reducing the torque applied to the turntable bearing 603 during regrinding, improving the rigidity of the turntable bearing 603, and further enhancing the rigidity and reliability of the B-axis turret 6.

[0038] In one embodiment, the grinding wheel frame 5 is mounted on the end face of the B-axis core shaft 601 by screws, the B-axis core shaft 601 is connected to the box 605 of the B-axis turret 6 through the turntable bearing 603, the inner ring of the turntable bearing 603 is connected to the step surface of the B-axis core shaft 601 by screws, and the outer ring of the turntable bearing 603 is connected to the step surface of the B-axis box 605 by screws. A box 605 pressure cover 602 is provided in the box 605 of the B-axis turret 6, and the box 605 pressure cover 602 is mounted on the box 605 of the B-axis turret 6 by screws to compress the B-axis core shaft, turntable bearing 603 and single-row cylindrical roller bearing 614 structure set in the box 605, and a dust cover 608 is provided at the end of the box 605 to prevent external dust from entering the box 605.

[0039] like Figure 2As shown, the B-axis turret 6 also includes a torque motor 604 and a detection and positioning assembly. The torque motor 604 is disposed within a housing 605 and located between the turntable bearing 603 and the single-row cylindrical roller bearing 614. The detection and positioning assembly is disposed within the housing 605 and below the B-axis spindle to detect and position the rotation angle of the B-axis spindle. The detection and positioning assembly includes a circular grating 609 and a locking disk 610. The circular grating 609 is disposed between the locking disk 610 and the B-axis spindle and located below the B-axis spindle. The locking disk 610 is fixedly mounted within the housing 605 to securely lock the circular grating 609. An adapter spindle 612 is disposed within the housing 605 and connected to the B-axis spindle. The circular grating 609 is disposed on the stepped surface of the adapter spindle 612 to detect and position the rotation angle of the B-axis spindle 601.

[0040] In one embodiment, a transition flange 613 is provided in the housing 605 of the B-axis turret 6, the transition flange 613 is installed on the rear bearing seat 606, the locking plate 610 is installed on the end face of the transition flange 613 by screws, the adapter core shaft 612 is connected to the B-axis core shaft 601, and the circular grating 609 is installed on the step surface of the adapter core shaft 612.

[0041] In this embodiment, the B-axis spindle 601 is driven to rotate by a torque motor 604, thereby driving the grinding wheel frame 5 to rotate. The grinding wheel frame 5 is equipped with two outer cylindrical spindles, three inner cylindrical spindles, an inner cylindrical grinding wheel 4, and an outer cylindrical grinding wheel 1, thereby achieving the rotation of the outer cylindrical grinding wheel 1 and the inner cylindrical grinding wheel 4. At the same time, after the B-axis spindle 601 rotates, the rotation position is detected by a circular grating 609 and fed back to the CNC system electrically connected to the circular grating 609, thereby achieving precise positioning of the rotation angle of the B-axis spindle 601. In a preferred embodiment, the circular grating 609 can enable the B-axis spindle 601 to achieve a repeatable positioning accuracy within an angle range of 1°. In addition, the circular grating 609 is locked by the setting of a locking disk 610, thereby achieving high-precision rotation, positioning, and locking of the B-axis spindle 601, further ensuring high-precision rotation of the B-axis turret 6.

[0042] Furthermore, the torque motor 604 is arranged between the turntable bearing 603 and the single-row cylindrical roller bearing 614, thereby making the structure of the B-axis turret 6 in the high-precision horizontal composite grinding machine more compact and convenient for installation and transportation.

[0043] See also Figure 2The B-axis turret 6 also includes a rear bearing seat 606, a bearing pressure cover 607 and a labyrinth cover 611; the rear bearing seat 606 is arranged on the end face of the B-axis housing 605 close to the single-row cylindrical roller bearing 614, and the single-row cylindrical roller bearing 614 is arranged in the mounting hole of the rear bearing seat 606. The bearing pressure cover 607 abuts against the single-row cylindrical roller bearing 614 to press the single-row cylindrical roller bearing 614 to support the B-axis core shaft. The labyrinth cover 611 is arranged at the end of the single-row cylindrical roller bearing 614 to seal the single-row cylindrical roller bearing 614.

[0044] In this embodiment, the provision of bearing pressure cap 607 further compresses the single-row cylindrical roller bearing 614, eliminating gaps in the B-axis structure and thus preventing vibration of the B-axis spindle 601 when the grinding wheel is subjected to force during grinding. This further enhances the rigidity of the high-precision horizontal compound grinding machine, improves grinding quality, and ensures the grinding accuracy of the high-precision horizontal compound grinding machine. Furthermore, the provision of labyrinth cover 611 effectively seals the single-row cylindrical roller bearing 614, preventing grease leakage within the bearing.

[0045] In one embodiment, the torque motor 604 includes a stator and a rotor; the stator is fixedly mounted on the inner wall of the housing 605, and the rotor is mounted on the outer cylindrical surface of the B-axis core shaft. A motor pressure cover 615 for positioning and locking the rotor and an adjustment pad 616 for adjusting the position of the rotor are arranged in the B-axis turret 6. The motor pressure cover 615 is connected to the rotor and the motor pressure cover 615 is connected to the step surface of the B-axis core shaft 601. An adjustment pad 616 is arranged between the motor pressure cover 615 and the rotor.

[0046] In this embodiment, the stator of the torque motor 604 is installed in the box 605 of the B-axis turret 6 by screws, and the rotor of the torque motor 604 is installed on the outer cylindrical surface of the B-axis core shaft 601. The motor cover 615 is connected to the rotor of the torque motor 604 by screws, and at the same time, the end face of the motor cover 615 is connected to the step surface of the B-axis core shaft 601 by screws, thereby achieving positioning and locking with the rotor of the torque motor 604. The bearing installation position of the rotor of the torque motor 604 is further adjusted by adjusting the pad 616.

[0047] like Figure 3 As shown, the outer cylindrical grinding wheel 1 assembly includes an outer cylindrical grinding wheel 1 and an outer cylindrical spindle 2, and the inner cylindrical grinding wheel 4 assembly includes an inner cylindrical grinding wheel 4 and an inner cylindrical spindle 3; the outer cylindrical grinding wheel 1 is connected to the grinding wheel frame 5 through the outer cylindrical spindle 2, and the inner cylindrical grinding wheel 4 is connected to the grinding wheel frame 5 through the inner cylindrical spindle 3, and the centers of the outer cylindrical spindle 2 and the inner cylindrical spindle 3 are coplanar and coincide with the center plane of the outer ring thickness of the turntable bearing 603.

[0048] In this embodiment, the centers of the outer spindle 2 and inner spindle 3 of this high-precision horizontal composite grinding machine are coplanar, coinciding with the center plane of the thickness of the outer ring of the turntable bearing 603. This is done to reduce the force on the turntable bearing 603 during grinding, thereby improving the rigidity of the B-axis turret 6 during grinding. The torque borne by the turntable bearing 603 of the B-axis turret 6 during grinding is as follows: M=F×L, where F is the force applied to the grinding wheel during grinding; L is the length of the lever arm of the turntable bearing 603 during grinding. Therefore, when the grinding force F is certain, to improve the rigidity of the turntable bearing 603 of the B-axis turret 6, it is necessary to reduce the length of the lever arm L of the turntable bearing 603 during grinding. In the present invention, the centers of the outer spindle 2 and the inner spindle 3 are made coplanar and coincide with the center plane of the thickness of the outer ring of the turntable bearing 603, so that the lever arm L is minimized during grinding by the grinding wheel, and the torque applied to the turntable bearing 603 is the minimum torque during grinding, thereby further improving the rigidity of the B-axis turret 6.

[0049] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A high-precision horizontal compound grinding machine, characterized in that: The high-precision horizontal compound grinding machine includes: an external grinding wheel assembly, an internal grinding wheel assembly, a grinding wheel frame and a B-axis turret; The outer grinding wheel assembly is connected to the grinding wheel frame, and the inner grinding wheel assembly is connected to the grinding wheel frame; The B-axis turret includes a box body, a B-axis core shaft, a turntable bearing and a single-row cylindrical roller bearing. The B-axis core shaft is connected to the grinding wheel frame. The B-axis core shaft is rotatably arranged in the box body, and the turntable bearing and the single-row cylindrical roller bearing are both arranged in the box body. The turntable bearing is connected to one end of the B-axis core shaft to limit and support the B-axis core shaft. The single-row cylindrical roller bearing is connected to the other end of the B-axis core shaft to support the B-axis core shaft. The outer cylindrical grinding wheel assembly includes an outer cylindrical grinding wheel and an outer cylindrical spindle. The inner cylindrical grinding wheel assembly includes an inner cylindrical grinding wheel and an inner cylindrical spindle. The outer grinding wheel is connected to the grinding wheel frame via the outer spindle, and the inner grinding wheel is connected to the grinding wheel frame via the inner spindle. The centers of the outer spindle and the inner spindle are coplanar and coincide with the center plane of the outer ring thickness of the turntable bearing.

2. The high-precision horizontal compound grinding machine according to claim 1, characterized in that: The B-axis turret also includes a torque motor and a detection and positioning component; The torque motor is arranged in the housing and located between the turntable bearing and the single-row cylindrical roller bearing. The detection and positioning assembly is arranged in the housing and located below the B-axis core shaft to detect and position the rotation angle of the B-axis core shaft.

3. The high-precision horizontal compound grinding machine according to claim 2, characterized in that: The detection and positioning assembly includes a circular grating and a locking disk; The circular grating is arranged between the locking disk and the B-axis core shaft and is located below the B-axis core shaft. The locking disk is fixedly arranged in the box body to fix and lock the circular grating.

4. The high-precision horizontal compound grinding machine according to claim 3, characterized in that: A transfer core shaft is provided in the box body, the transfer core shaft is connected to the B-axis core shaft, and the circular grating is provided on the step surface of the transfer core shaft to detect and position the rotation angle of the B-axis core shaft.

5. The high-precision horizontal compound grinding machine according to claim 4, characterized in that: The B-axis turret also includes a rear bearing seat, a bearing cover and a labyrinth cover; The rear bearing seat is arranged on the end face of the box body close to the single-row cylindrical roller bearing, the single-row cylindrical roller bearing is arranged in the mounting hole of the rear bearing seat, the bearing pressure cover is in contact with the single-row cylindrical roller bearing to press the single-row cylindrical roller bearing to support the B-axis core shaft, and the labyrinth cover is arranged at the end of the single-row cylindrical roller bearing to seal the single-row cylindrical roller bearing.

6. The high-precision horizontal compound grinding machine according to claim 5, characterized in that: The torque motor includes a stator and a rotor; The stator is fixed on the inner wall of the box, the rotor is arranged on the outer cylindrical surface of the B-axis core shaft, and a motor cover for positioning and locking the rotor and an adjustment pad for adjusting the position of the rotor are arranged in the B-axis turret. The motor cover is connected to the rotor and the motor cover is connected to the step surface of the B-axis core shaft, and the adjustment pad is arranged between the motor cover and the rotor.

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