High-precision horizontal composite grinding machine

Abstract

The invention 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 rotating tower. 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, and the single-row cylindrical roller bearing is connected with the other end of 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 center of the outer circle grinding wheel assembly and the center of the inner circle grinding wheel assembly are coplanar and coincide with the thickness center face of the outer ring of the rotary table bearing. According to the grinding machine, through the structural arrangement in the B-axis turret, high precision of the B-axis turret is achieved, the positioning precision of the B-axis turret is improved, and high rigidity and high reliability of the B-axis turret structure can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of cylindrical grinding machines, and more specifically to a high-precision horizontal compound grinding machine. Background Art

[0002] With the development of science and technology and the promotion of productivity, the processing accuracy of mechanical products is getting higher and higher, and the surface roughness requirements are getting lower and lower, which makes the role of grinders in various sectors of the national economy more and more important.

[0003] In recent years, with the rapid development and promotion of high-efficiency grinding technology and composite grinding technology, the grinding process of grinding machines has gradually changed from a single grinding process to a composite grinding process. For example, the horizontal composite grinding machine has the processing capabilities of external cylindrical grinding, internal cylindrical grinding, thread grinding, end face grinding, non-circular grinding, etc., which are suitable for single and batch grinding of medium-sized processing applications. This type of composite grinding machine is highly compatible with the high-precision zero processing requirements of shaft cores, hydraulic valve cores, motor cores, precision reducer shafts, precision flanges, differential shafts, etc., and is suitable for a variety of clamping and positioning methods and multiple grinding wheel combinations. This type of multi-process and multi-functional composite grinding machine has formed a very good market benefit. Therefore, how to improve the high precision, high rigidity and high reliability of the steering position angle of the grinding wheel frame B axis of the composite grinder is particularly important. At present, the B-axis structures of composite cylindrical grinders on the market mainly include the following:

[0004] ① Hirth-type B-axis indexing structure, but the hirth-type B-axis structure cannot achieve stepless indexing of the B-axis, and cannot better meet the requirements of the ever-changing product diversification. At the same time, the hirth-type B-axis structure is mostly manually adjusted or semi-automatically adjusted, and it is not easy to achieve automatic control and automatic compensation.

[0005] ② The B-axis indexing structure of the worm gear indexing is driven by a servo motor, but the B-axis structure of the worm gear is complex. In addition, the B-axis structure of the worm gear structure has backlash due to the worm gear pair, which easily leads to insufficient rigidity of the grinding wheel during the grinding process, causing vibration and affecting the grinding quality of the workpiece.

[0006] Therefore, how to improve the high precision and high rigidity of the steering position angle of the grinding wheel frame B-axis of the compound grinder is a problem that needs to be solved urgently. Summary of the invention

[0007] The purpose of the present invention is to provide a high-precision horizontal compound grinding machine. The high-precision horizontal compound grinding machine provided by the present invention can not only achieve high precision of the B-axis turret of the grinding wheel frame, improve the rotation positioning accuracy and repeated positioning accuracy of the B-axis turret, but also achieve 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 outer cylindrical grinding wheel assembly, an inner cylindrical 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, a turntable bearing and a single-row cylindrical roller bearing. The B-axis core is connected to the grinding wheel frame. The B-axis core 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 to limit and support the B-axis core. The single-row cylindrical roller bearing is connected to the other end of the B-axis core to support the B-axis core. 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 to detect and position the rotation angle of the B-axis core.

[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 and is located below the B-axis core. The locking disk is fixedly arranged in the box 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, 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, and 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 shaft core, 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.

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

[0022] 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.

[0023] The beneficial effects of the present invention are:

[0024] The high-precision horizontal composite grinding machine sets the B-axis mandrel between the single-row cylindrical roller bearing and the turntable bearing, so that the B-axis shaft core can be limited and supported by the single-row cylindrical roller bearing and the turntable bearing, so that the B-axis mandrel is less deformed 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 structural setting in which the centers of the outer cylindrical spindle and the inner cylindrical spindle are coplanar and coincide with the center plane of the outer ring thickness of the turntable bearing minimizes the force arm of the grinding wheel assembly when it is subjected to stress during grinding, thereby reducing the force torque of the turntable bearing during the re-grinding process, improving the rigidity of the turntable bearing, and further improving the rigidity and reliability of the B-axis turret.

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

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

[0027] Figure 2 It is a structural schematic diagram of a B-axis turret of a high-precision horizontal compound grinding machine of the present invention;

[0028] Figure 3The invention discloses a schematic layout diagram of an outer cylindrical spindle, an inner cylindrical spindle and a turntable bearing 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 cover; 603. Turntable bearing; 604. Torque motor; 605. Box; 606. Rear bearing seat; 607. Bearing cover; 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 cover; 616. Adjustment pad;

[0032] 7. Workpiece. DETAILED DESCRIPTION

[0033] Many specific details are set forth in the following description to facilitate a full 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 can make similar modifications without violating the connotation of the present invention, so the present invention is not limited to the specific implementation 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", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood 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 the specification of the present invention herein 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 shaft core, a turntable bearing 603 and a single-row cylindrical roller bearing 614, the B-axis shaft core is connected to the grinding wheel frame 5, and the B-axis shaft core The turntable bearing 603 and the single-row cylindrical roller bearing 614 are rotatably arranged in the box body 605, and the turntable bearing 603 is connected to one end of the B-axis core to limit the support of the B-axis core, and the single-row cylindrical roller bearing 614 is connected to the other end of the B-axis core to support the B-axis core. 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. The high-precision horizontal composite grinding machine sets the B-axis mandrel 601 between the single-row cylindrical roller bearing 614 and the turntable bearing 603, so that the B-axis axis core can be limited and supported by the single-row cylindrical roller bearing 614 and the turntable bearing 603, so that the B-axis mandrel 601 is less deformed under stress, further improving the rigidity of the B-axis mandrel 601, avoiding vibration of the B-axis mandrel 601 during grinding, and further improving the grinding quality of the workpiece 7. In addition, the structural setting in which 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 minimizes the force arm of the grinding wheel assembly when it is subjected to stress during grinding, thereby reducing the force torque of the turntable bearing 603 during the re-grinding process, improving the rigidity of the turntable bearing 603, and further improving the rigidity and reliability of the B-axis turret 6.

[0038] In one embodiment, the grinding wheel frame 5 is installed 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 installed on the box 605 of the B-axis turret 6 by screws to compress the B-axis shaft core, turntable bearing 603 and single-row cylindrical roller bearing 614 structure arranged 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 arranged in the box body 605 and is located between the turntable bearing 603 and the single-row cylindrical roller bearing 614, and the detection and positioning assembly is arranged in the box body 605 and is located below the B-axis shaft core to detect and position the rotation angle of the B-axis shaft core. The detection and positioning assembly includes a circular grating 609 and a locking disk 610; the circular grating 609 is arranged between the locking disk 610 and the B-axis shaft core and is located below the B-axis shaft core, and the locking disk 610 is fixedly arranged in the box body 605 to fix and lock the circular grating 609. A transfer mandrel 612 is arranged in the box body 605, and the transfer mandrel 612 is connected to the B-axis shaft core. The circular grating 609 is arranged on the step surface of the transfer mandrel 612 to detect and position the rotation angle of the B-axis mandrel 601.

[0040] In one embodiment, a transition flange 613 is provided in the box 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 the torque motor 604, which drives the grinding wheel frame 5 to rotate. The grinding wheel frame 5 is equipped with 2 outer cylindrical spindles, 3 inner cylindrical spindles, inner cylindrical grinding wheel 4 and outer cylindrical grinding wheel 1, so as to realize the rotation of outer cylindrical grinding wheel 1 and inner cylindrical grinding wheel 4. At the same time, after the B-axis spindle 601 rotates, the rotation position is detected by the circular grating 609 and fed back to the numerical control system electrically connected to the circular grating 609, so as to realize the 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 the locking disk 610, so as to realize the high-precision rotation, positioning and locking of the B-axis spindle 601, and further ensure the high-precision rotation of the B-axis turret 6.

[0042] Furthermore, the torque motor 604 is disposed 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, the single-row cylindrical roller bearing 614 is arranged in the mounting hole of the rear bearing seat 606, the bearing pressure cover 607 is in contact with the single-row cylindrical roller bearing 614 to press the single-row cylindrical roller bearing 614 to support the B-axis shaft core, and 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 setting of the bearing pressure cover 607 further compresses the single-row cylindrical roller bearing 614, avoiding the existence of a gap in the B-axis structure, thereby avoiding the vibration of the B-axis mandrel 601 when the grinding wheel is subjected to force during the grinding process, further improving the rigidity of the high-precision horizontal compound grinder, improving the grinding quality, and ensuring the grinding accuracy of the high-precision horizontal compound grinder. Furthermore, the setting of the labyrinth cover 611 can effectively seal the single-row cylindrical roller bearing 614 to avoid leakage of grease in 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 disposed on the outer cylindrical surface of the B-axis shaft core. A motor pressure cap 615 for positioning and locking the rotor and an adjustment pad 616 for adjusting the rotor position are disposed in the B-axis turret 6. The motor pressure cap 615 is connected to the rotor and the motor pressure cap 615 is connected to the step surface of the B-axis core shaft 601. An adjustment pad 616 is disposed between the motor pressure cap 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 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 high-precision horizontal composite grinding machine makes the centers of the outer cylindrical spindle 2 and the inner cylindrical spindle 3 coplanar and coincide with the center plane of the thickness of the outer ring of the turntable bearing 603. The purpose of this is to make the turntable bearing 603 less stressed when the grinding wheel is subjected to grinding force, so that the rigidity of the B-axis turret 6 is better when subjected to grinding force. The torque borne by the turntable bearing 603 of the B-axis turret 6 during grinding is as follows: M=F×L, wherein F is the force exerted on the grinding wheel during grinding; L is the length of the force arm of the turntable bearing 603 during grinding; therefore, when the grinding force F is certain, in order to improve the rigidity of the turntable bearing 603 of the B-axis turret 6, it is necessary to reduce the length of the force arm L of the turntable bearing 603 during grinding. In the present invention, the centers of the outer cylindrical spindle 2 and the inner cylindrical 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 force arm L is minimized during grinding by the grinding wheel, and the torque exerted on 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 may 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 only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high-precision horizontal compound grinding machine, characterized in that: The high-precision horizontal compound grinding machine comprises: an outer cylindrical grinding wheel assembly, an inner cylindrical 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 housing, a B-axis core, a turntable bearing and a single-row cylindrical roller bearing. The B-axis core is connected to the grinding wheel frame. The B-axis core 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 to limit and support the B-axis core. The single-row cylindrical roller bearing is connected to the other end of the B-axis core to support the B-axis core. 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.

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 assembly; 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 to detect and position the rotation angle of the B-axis core.

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 and is located below the B-axis core. The locking disk is fixedly arranged in the box to fix and lock the circular grating.

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

5. The high-precision horizontal compound grinding machine according to any one of claims 1 to 4, characterized in that: The B-axis turret also includes a rear bearing seat, a bearing gland and a labyrinth cover; 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, 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 any one of claims 1 to 4, characterized in that: The torque motor comprises a stator and a rotor; 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 shaft core, 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.

7. The high-precision horizontal compound grinding machine according to any one of claims 1 to 4, characterized in that: The outer grinding wheel assembly comprises an outer grinding wheel and an outer spindle, and the inner grinding wheel assembly comprises an inner grinding wheel and an inner 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.

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