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CN-121989110-A - Automatic feeding and receiving type centerless grinding machine and method thereof

CN121989110ACN 121989110 ACN121989110 ACN 121989110ACN-121989110-A

Abstract

The invention relates to the field of machining manufacturing equipment, in particular to an automatic feeding and receiving type centerless grinder and a method thereof, wherein the centerless grinder comprises a base, a grinding wheel, a guide wheel functional part, a feeding functional part, a receiving functional part and a controller; the system stably pushes the workpiece through the cooperation of the linear motor and the spherical groove pushing rod, and after the workpiece enters a grinding area, the controller switches the linear motor to a constant force following mode, and the core is that the dynamic retention resistance is calculated by monitoring the conversion of real-time current into following thrust, so that the real-time perception of an axial feeding hysteresis state is realized.

Inventors

  • Zhou jiongming
  • YUAN QINGFENG

Assignees

  • 东莞市日月不锈钢有限公司

Dates

Publication Date
20260508
Application Date
20260325

Claims (10)

  1. 1. An automatic feeding and receiving centerless grinder, comprising: A base (1); A grinding wheel function part (2) fixed above the base (1) and comprising a grinding wheel spindle box (3), a grinding wheel spindle (4) installed therein, a grinding wheel (5) connected with the end part of the grinding wheel spindle (4) and a spindle motor (6) for driving the grinding wheel spindle (4); The guide wheel functional part (7) is arranged on the other side of the base (1) in a sliding manner and comprises a guide wheel seat (8), a guide wheel main shaft (9) arranged on the guide wheel main shaft, a guide wheel (10) connected with the end part of the guide wheel main shaft (9) and a guide wheel servo motor (11) for driving the guide wheel main shaft (9), and a supporting plate (12) is fixed between the grinding wheel (5) and the guide wheel (10); The feeding functional part (13) is arranged on the feeding side of the base (1) and comprises a V-shaped guide groove (14) and a linear motor (15) which are arranged in a matched mode, a pushing rod (17) is connected to the end portion of a rotor shaft (16) of the linear motor (15), and a spherical groove (18) is formed in the end portion of the pushing rod (17) and is linearly arranged with the V-shaped guide groove (14); the receiving functional part (19) is arranged on the discharging side of the base (1) and comprises a discharging guide rail (20), a receiving turning plate (21) connected with the tail end of the discharging guide rail and a receiving cylinder (22) connected with the bottom of the receiving turning plate (21); And a controller (23) connected with and controlling the operation of the grinding wheel functional part (2), the guide wheel functional part (7), the feeding functional part (13) and the receiving functional part (19).
  2. 2. The automatic feeding and receiving type centerless grinding machine according to claim 1, wherein the base (1) is provided with a dovetail guide rail (24), the guide wheel seat (8) is slidably mounted on the dovetail guide rail (24), a ball screw (25) is connected to the bottom of the guide wheel seat (8), and the ball screw (25) is connected to a feeding servo motor (26), wherein a fit clearance between the guide wheel seat (8) and the dovetail guide rail (24) is 0.01mm.
  3. 3. The automatic feeding and receiving type centerless grinding machine according to claim 1, wherein the spherical groove (18) is of a concave structure, the curvature radius of the spherical groove (18) is larger than the end face chamfering radius of a workpiece to be machined, and the pushing rod (17) is connected to the end part of a rotor shaft (16) of the linear motor (15) through threads.
  4. 4. The automatic feeding and receiving type centerless grinding machine according to claim 1, wherein the other end of the guide wheel spindle (9) is connected with the guide wheel servo motor (11) through an elastic coupler (28), the elastic coupler (28) is plum blossom-shaped, and the torsional rigidity of the elastic coupler (28) is 6000 nm per radian.
  5. 5. The automatic feeding and receiving type centerless grinding machine according to claim 1, wherein a hydrodynamic bearing (29) is arranged in the grinding wheel spindle box (3), the grinding wheel spindle (4) is supported by the hydrodynamic bearing (29), and the grinding wheel spindle (4) is connected with the spindle motor (6) by a multi-wedge belt (30).
  6. 6. The automatic feeding and receiving type centerless grinding machine according to claim 1, wherein an angular contact ball bearing (27) is arranged on the guide wheel seat (8), the guide wheel spindle (9) is installed through the angular contact ball bearing (27), and the pretightening force of the angular contact ball bearing (27) is 800 newtons.
  7. 7. The automatic feeding and receiving type centerless grinding machine according to claim 1, wherein the tail end of the discharging guide rail (20) is connected with the receiving turning plate (21) through a hinge (31), and a piston rod (32) of the receiving cylinder (22) is connected with the bottom of the receiving turning plate (21) through a pin shaft (33).
  8. 8. A control method applied to the automatic feeding and receiving centerless grinder of claim 1, comprising: s1, controlling a spindle motor (6) to drive a grinding wheel (5) to rotate to a working rotating speed, and controlling a guide wheel servo motor (11) to drive a guide wheel (10) to rotate to a reference rotating speed; S2, controlling a linear motor (15) to drive a pushing rod (17) to extend out, and pushing a workpiece to be processed placed on a V-shaped guide groove (14) into a grinding area between the grinding wheel (5) and the guide wheel (10); s3, controlling the linear motor (15) to switch to a constant force following mode, so that the linear motor outputs continuous and constant preset basic thrust, and driving the spherical groove (18) of the pushing rod (17) to be attached to the end face of the workpiece to be processed to synchronously advance; s4, monitoring the output current of the linear motor (15) and the driving current of the guide wheel servo motor (11), and converting the real-time driving current of the guide wheel servo motor (11) into total torque; s5, subtracting a preset no-load friction torque from the total torque to obtain a net cutting torque, and dividing the net cutting torque by a preset effective radius parameter to obtain a circumferential grinding force in a conversion way; s6, converting real-time fluctuation current when the linear motor (15) maintains a constant force following state into following thrust, and obtaining dynamic retention resistance by difference between the following thrust and a preset basic thrust; S7, multiplying the circumferential grinding force and the dynamic retention resistance to obtain a coupling characteristic value, controlling the guide wheel servo motor (11) to reduce the rotating speed and controlling the linear motor (15) to superimpose the compensation thrust when the coupling characteristic value is larger than a preset safety threshold, and controlling the guide wheel servo motor (11) to recover the rotating speed and controlling the linear motor (15) to cancel the compensation thrust when the coupling characteristic value is smaller than or equal to the preset safety threshold; S8, controlling the linear motor (15) to retract to an initial position, controlling the receiving cylinder (22) to retract to drive the receiving turning plate (21) to incline, and then controlling the receiving cylinder (22) to extend out to reset the receiving turning plate (21); The steps of S1 to S8 above are looped.
  9. 9. The control method according to claim 8, characterized in that the step of S1 is preceded by: S0, recording the driving current of the guide wheel servo motor (11) when the guide wheel servo motor maintains constant rotation under the condition that no workpiece to be processed exists, and converting the driving current into the preset no-load friction torque according to a preset torque constant.
  10. 10. The control method according to claim 8, characterized in that in the step S3, controlling the linear motor (15) to switch to a constant force following mode includes: And controlling the linear motor (15) to work and output the constant preset basic thrust.

Description

Automatic feeding and receiving type centerless grinding machine and method thereof Technical Field The invention relates to the field of machining manufacturing equipment, in particular to an automatic feeding and receiving type centerless grinding machine and a method thereof. Background In order to maintain the processing beat, the existing scheme generally adopts the hard pushing framework to execute the feeding action, although the scheme has basic feeding capability in the conventional continuous processing scene, the rigid contact characteristic of the scheme is extremely easy to cause impact damage to the end face of the workpiece at the moment of contact, meanwhile, the push rod immediately executes the retraction action, the mechanical connection with the workpiece is thoroughly cut off, so that the control system cannot interfere with the subsequent actual grinding process, in addition, the uneven surface abrasion of the grinding wheel and the workpiece material can cause dynamic change of the actual cutting force of the grinding area along with the deep grinding process, and the inherent tooth gaps and the inherent cutting friction fluctuation inside the traditional spindle and the speed reduction transmission mechanism can cause weak cutting torque change of the grinding area, so that the equipment can not sense the real-time sensing of the internal physical state of the grinding area easily, and the dynamic sliding and the axial and the sliding resistance rate cannot be covered up, and the real-time sensing of the internal physical state of the grinding area cannot be caused. Therefore, how to eliminate the hard mechanical impact of the feeding link and establish a real-time high-sensitivity sensing and self-adaptive cooperative control mechanism aiming at the internal grinding state of the centerless grinder becomes a technical problem to be solved. Disclosure of Invention In order to solve the technical problems, the invention provides an automatic feeding and receiving type centerless grinder and a method thereof, and specifically, the technical scheme of the invention is as follows: an automatic feeding and receiving type centerless grinder, comprising: A base; a grinding wheel functional part fixed above the base and comprising a grinding wheel spindle box, a grinding wheel spindle installed therein, a grinding wheel connected with the end of the grinding wheel spindle and a spindle motor driving the grinding wheel spindle; The guide wheel functional part is arranged on the other side of the base in a sliding manner and comprises a guide wheel seat, a guide wheel main shaft arranged on the guide wheel seat, a guide wheel connected with the end part of the guide wheel main shaft and a guide wheel servo motor for driving the guide wheel main shaft, and a supporting plate is fixed between the grinding wheel and the guide wheel; the feeding functional part is arranged on the feeding side of the base and comprises a V-shaped guide groove and a linear motor which are matched, the end part of a rotor shaft of the linear motor is connected with a pushing rod, and the end part of the pushing rod is provided with a spherical groove and is linearly arranged with the V-shaped guide groove; The receiving functional part is arranged on the discharging side of the base and comprises a discharging guide rail, a receiving turning plate connected with the tail end of the discharging guide rail and a receiving cylinder connected with the bottom of the receiving turning plate; the controller is connected with and controls the work of the grinding wheel functional part, the guide wheel functional part, the feeding functional part and the receiving functional part; In one embodiment, the base is provided with a dovetail guide rail, the guide wheel seat is slidably mounted on the dovetail guide rail, the bottom of the guide wheel seat is connected with a ball screw, the ball screw is connected with a feeding servo motor, and a fit clearance between the guide wheel seat and the dovetail guide rail is 0.01mm. In one embodiment, the spherical groove is of a concave structure, the curvature radius of the spherical groove is larger than the end face chamfering radius of the workpiece to be processed, and the pushing rod is connected to the end part of the rotor shaft of the linear motor through threads. In one embodiment, the other end of the guide wheel spindle is connected with the guide wheel servo motor through an elastic coupler, the elastic coupler is quincuncial, and the torsional rigidity of the elastic coupler is 6000 nm per radian. In one embodiment, a hydrodynamic bearing is disposed in the grinding wheel spindle box, the grinding wheel spindle is supported by the hydrodynamic bearing, and the grinding wheel spindle is connected with the spindle motor by a v-ribbed belt. In one embodiment, the guide wheel seat is provided with an angular contact ball bearing, the guide wheel main shaft is installed throug