CN115673944A - Device and method for grinding disc cam face based on magnetic grinding - Google Patents

Abstract

The invention relates to a device and a method for grinding a working surface of a disc cam based on magnetic grinding, wherein the device comprises a workbench, a reciprocating mechanism, a cam clamping mechanism, a grinding mechanism, a distance measuring mechanism and a control system; the invention adopts a magnetic grinding mode, thereby effectively avoiding the problem that the surface of the cam workpiece is easily burnt due to grinding by a grinding wheel; the distance measuring sensor is adopted to control the workpiece to feed, the problems of scratches, burrs and pits on the surface of the cam workpiece caused by low feeding precision of the grinding mechanism are effectively solved, the irregular working surface of the cam is accurately ground, and the machining precision is ensured.

Description

A device and method for grinding disc cam face based on magnetic grinding

technical field

The invention relates to the technical field of irregular surface grinding, in particular to a device and method for grinding a disk cam working surface based on magnetic force grinding.

Background technique

With the development of my country's industrial economy and the advancement of science and technology, industries such as aerospace, ships, automobiles, and automated machine tools have developed rapidly, and the requirements for the surface quality of mechanical parts are also getting higher and higher. Finishing can reduce and refine the surface roughness of parts, remove scratches, microscopic cracks and other surface defects, improve and improve the surface quality of parts, improve the mechanical properties of parts surface, improve the stress distribution state; remove edge burrs, ensure Smooth transition between surfaces, improve the assembly process of parts; improve the surface gloss and brightness of parts, etc. As a common part in precision machinery, the grinding accuracy of the cam surface is directly related to the performance of the entire device, so the requirements for the surface roughness of the cam are very strict.

The traditional cam grinding process adopts the processing method of imitating the shape, which has high requirements for the machining accuracy of the master model, and the master model itself is easy to wear during the grinding process; in addition, the cams with different shapes should be matched with the shape The profiling, and the profiling process generally adopts grinding wheel grinding, the processing efficiency is low, and the material loss is serious. With the rise of numerical control technology, high-speed numerical control grinding machines are widely used to achieve precise grinding of cams, but the equipment is expensive, the process cost is high, and the technical requirements for operators are relatively high. And the high-speed CNC grinding machine also adopts the grinding wheel grinding method. When grinding the parts that have undergone surface hardening treatment, due to the high grinding speed, the grinding area will generate instantaneous high temperature, and the parts will have surface burns.

The Chinese utility model patent whose authorized notification number is CN 214135375 U discloses a kind of "processing and polishing device for automobile camshafts, including a machine table, a wheel shaft turntable is installed on the machine table, and columns are arranged on both sides of the wheel shaft turntable, and the inner side of the column slides up and down. A mounting base is connected, and a grinding motor is slidingly connected to the mounting base. The output shaft of the grinding motor is fixed with a polishing wheel. There is a wheel shaft lock. The polishing wheel moves up and down along the camshaft by rotating the motor, thereby realizing the continuous and automatic grinding of multiple cam surfaces. During the movement, the distance between the cam surfaces of the camshaft is sensed by the distance sensor , and then the controller drives the electric push rod to drive the polishing wheel to adjust the left and right of the camshaft to realize the back and forth grinding and polishing operation of the camshaft. This device uses a distance measuring sensor to realize the control of the grinding process, but the grinding wheel is still used for grinding.

There are many disadvantages in the traditional complex surface finishing method, and the magnetic grinding method, which has developed rapidly in recent years, applies magnetic field to the grinding technology, which has the advantages of good self-sharpening performance, strong grinding ability, high processing efficiency, and small grinding temperature rise. , suitable for the processing of plane, spherical, cylindrical and other complex shape parts, and the use of automation to achieve smooth processing solves the problems existing in traditional grinding methods. For example, the Chinese patent application with the application publication number CN 110000621 A discloses "a magnetic grinding device and magnetic grinding method for large plane polishing", and the Chinese patent application with the application publication number CN 109015280A discloses a "space arbitrary axis A magnetic grinding device and method for the inner and outer surfaces of a variable-diameter complex elbow", etc. However, there is no suitable magnetic grinding device for the processing of the special part of the disc cam.

Contents of the invention

The invention provides a device and method for grinding the working surface of a disc-shaped cam based on magnetic grinding. The magnetic grinding method is adopted to effectively avoid the problem that the surface of the cam workpiece is easily burned by the grinding of the grinding wheel; the feeding of the workpiece is controlled by a distance measuring sensor, It effectively avoids the problem of scratches, burrs and pits on the surface of the cam workpiece caused by the low feed precision of the grinding mechanism, realizes the precise grinding of the irregular working surface of the cam, and ensures the machining accuracy.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

A device for grinding a disk-shaped cam working surface based on magnetic grinding, including a workbench, a reciprocating mechanism, a cam clamping mechanism, a grinding mechanism, a distance measuring mechanism and a control system; the reciprocating mechanism is arranged on the workbench, It is used to drive the cam clamping mechanism to reciprocate longitudinally along the workbench; the cam clamping mechanism is used to install and drive the cam workpiece to rotate around its own axis; the grinding mechanism includes cylindrical permanent magnets and magnetic grinding media, cylindrical permanent magnets Located at one end of the reciprocating mechanism and capable of rotating around its own axis, the outer side of the cylindrical permanent magnet absorbs magnetic grinding media; the distance measuring mechanism is equipped with an infrared distance measuring sensor for real-time detection of the distance of the surface of the cam workpiece to be processed; Describe the reciprocating movement driving device in the reciprocating movement mechanism, the cam rotation driving device in the cam clamping mechanism, the driving end of the cylindrical permanent magnet rotation driving device in the grinding mechanism, and the signal output of the infrared distance measuring sensor in the distance measuring mechanism The terminals are respectively connected to the control system.

Described reciprocating movement mechanism comprises active sliding table and driven sliding table; Active sliding table is made up of mobile motor, leading screw, leading screw support block and active sliding block; The two ends of leading screw are supported by leading screw supporting block, and leading screw and The supporting blocks of the screw are rotatably connected; the end of the screw away from the grinding mechanism is connected with the motor shaft of the mobile motor through a coupling, and the active slider and the screw are connected through screw transmission; under the action of the mobile motor, the active sliding The block moves back and forth along the lead screw; the driven slide table is composed of the optical axis, the optical axis support block and the driven slider; the optical axis is set parallel to the lead screw, and the two ends of the optical axis are supported by the optical axis support block The shaft support blocks are fixedly connected, and the driven slider is slidably connected to the optical axis; the active slider and the driven slider are respectively connected to the cam clamping mechanism, and when the active slider drives the cam clamping mechanism to move, the driven slider moves along the The optical axis moves.

The cam clamping mechanism is composed of support frame one, support frame two, bearing seat, mounting shaft, positioning bushing, locking bushing, large bevel gear, small bevel gear and cam rotation motor; support frame one and support frame two Symmetrically arranged, the bottom of the support frame 1 is connected with the active slider, the bottom of the support frame 2 is connected with the driven slider; the top of the support frame 1 and the top of the support frame 2 are respectively equipped with bearing seats, the installation shaft is set horizontally, and the installation shaft The two ends are rotationally connected with the bearing seat at the corresponding end; the cam workpiece and the installation shaft are driven by a key, and the positioning sleeve and the locking sleeve are respectively arranged on the installation shaft on both sides of the cam workpiece, and the positioning sleeve, locking sleeve It is connected with the installation shaft through threads, and the position of the cam workpiece on the installation shaft is adjusted by the positioning sleeve, and then locked and fixed by the locking sleeve; one end of the installation shaft extends out of the bearing seat, and the protruding end is provided with a large The bevel gear, the large bevel gear and the small bevel gear are meshed for transmission, and the small bevel gear is arranged on the motor shaft of the cam rotating motor; under the action of the cam rotating motor, the mounting shaft drives the cam workpiece to rotate around its own axis.

The grinding mechanism is composed of a support frame, a cylindrical permanent magnet, a magnetic grinding medium, a belt transmission mechanism and a permanent magnet rotating motor; the support frame is set on the workbench at one end of the reciprocating movement mechanism, and bearing seats are respectively arranged at both ends of the top of the support frame. The cylindrical permanent magnet is arranged on the horizontal central shaft, and the two ends of the central shaft are connected to the corresponding end of the bearing housing in rotation, and the magnetic grinding medium is adsorbed on the outer surface of the cylindrical permanent magnet; the central shaft and the cylindrical permanent magnet are arranged coaxially, and the center One end of the shaft protrudes from the corresponding bearing seat, and the protruding end is equipped with a pulley 1; the permanent magnet rotating motor is set on the workbench, and the pulley 2 is set on the motor shaft, and the pulley 1 and the pulley 2 are connected by a transmission belt to form a belt drive. Mechanism; under the action of the permanent magnet rotating motor, the cylindrical permanent magnet rotates around the axis of the central axis, and the steering of the cylindrical permanent magnet is opposite to that of the cam workpiece; the length of the cylindrical permanent magnet is greater than the thickness of the cam workpiece.

The ranging mechanism is composed of an infrared ranging sensor, a support column and a beam; the infrared ranging sensor is arranged on the outer top of the cylindrical permanent magnet, the infrared ranging sensor is installed on the beam, and the two ends of the beam are supported by the supporting columns at the corresponding ends , the bottom of the support column is fixedly connected with the workbench.

The control system is composed of a PLC controller, a control cabinet and a control panel; the control cabinet is arranged on the workbench, the controller is arranged in the control cabinet, and the control panel is arranged outside the control cabinet.

A method for grinding a disk cam face based on magnetic grinding, comprising the steps of:

(1) Install the cam workpiece on the installation shaft in the cam clamping mechanism, adjust and fix the position of the cam workpiece on the installation shaft through the coordination of the positioning sleeve and the locking sleeve, so that the cam workpiece is aligned with the cylindrical permanent magnet ;

(2) Mix the magnetic abrasive and the water-based grinding liquid according to the weight ratio of 1:3 to 1.5; 3, stir evenly, and then adsorb on the surface of the cylindrical permanent magnet;

(3) Set the rotation speed of the cam rotating motor and the permanent magnet rotating motor through the control panel; start the moving motor to make the active sliding table and the driven sliding table move synchronously, and move the cam workpiece to the end of the cylindrical permanent magnet; measure the distance by infrared The interlocking control of the sensor and the moving motor makes the gap between the initial surface to be processed on the cam workpiece and the cylindrical permanent magnet 0.5 ~ 2mm; start the cam rotating motor and the permanent magnet rotating motor, so that the cam workpiece is opposite to the cylindrical permanent magnet Rotate, grind the working surface of the cam workpiece through magnetic abrasives; during the grinding process, the infrared distance measuring sensor and the moving motor are interlocked and controlled by the PLC controller, so that the gap between the real-time processing surface of the cam workpiece and the cylindrical permanent magnet is always maintained In 0.5 ~ 2mm;

(4) After the grinding is completed, the cam rotating motor and the permanent magnet rotating motor stop rotating, and the moving motor reversely rotates to drive the cam workpiece to return to the initial position; unload the cam workpiece and clean and dry it, and measure the roughness of the cam workpiece working surface;

(5) The cylindrical permanent magnet in the grinding mechanism is removed, and the magnetic abrasives adsorbed on it are recovered.

Compared with prior art, the beneficial effect of the present invention is:

(1) The present invention adopts the way of workpiece feeding to process. Compared with the way of grinding mechanism feeding, it effectively avoids the low feeding accuracy caused by the uneven force of the grinding mechanism, which is easy to cause damage to the surface of the cam workpiece. Problems with scratches, burrs and dents;

(2) In the present invention, the magnetic abrasive is mixed with the grinding liquid and adsorbed on the cylindrical permanent magnet as a magnetic grinding medium to replace the traditional grinding wheel to grind the cam workpiece, effectively avoiding the burning of the cam surface due to temperature rise during the grinding of the grinding wheel question;

(3) The present invention adopts magnetic grinding to replace the grinding wheel grinding of transmission, which improves processing efficiency and reduces material loss;

(4) The present invention carries out interlocking control with the mobile motor in the infrared ranging sensor and the reciprocating movement mechanism through the control system, and adjusts the relative position between the cam workpiece and the cylindrical permanent magnet in real time according to the surface shape of the cam workpiece, ensuring that the cam workpiece machining accuracy.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is a three-dimensional structural schematic diagram of a device for grinding the working surface of a disc cam based on magnetic grinding according to the present invention.

FIG. 2 is a rear view of FIG. 1 .

Fig. 3 is a three-dimensional structural schematic view of the grinding mechanism of the present invention.

Fig. 4 is a schematic perspective view of the cam clamping mechanism of the present invention.

Explanation of reference signs:

In the figure: 1. Mobile motor 2. Active sliding table 3. Support frame 1. 4. Cam workpiece 5. Bearing seat 6. Positioning sleeve 7. Cylindrical permanent magnet 8. Infrared ranging sensor 9. Beam 10. Support column 11 .Control cabinet 12.Start button 13.Speed control knob 1 14.Emergency stop button 15.Speed control knob 2 16.Permanent magnet rotating motor 17.Driven slide 18.Working table 19.Large bevel gear 20.Small bevel gear 21. Cam rotation motor 22. Power cord 1 23. Coupling 24. Power cord 2 25. Power cord 3 26. Sensor cable 27. Pulley 1 28. Transmission belt 29. Pulley 2 30. Support frame 31. Bearing seat 32. Bearing 33. Mounting shaft 34. Locking sleeve

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

As shown in Fig. 1 and Fig. 2, a kind of device based on magnetic grinding of the present invention realizes disc-shaped cam working surface grinding, including workbench 18, reciprocating movement mechanism, cam clamping mechanism, grinding mechanism, distance measuring mechanism and control system; the reciprocating movement mechanism is arranged on the workbench 18, and is used to drive the cam clamping mechanism to reciprocate longitudinally along the workbench 18; the cam clamping mechanism is used to install and drive the cam workpiece 4 to rotate around its own axis; Described grinding mechanism comprises cylindrical permanent magnet 7 and magnetic grinding medium, and cylindrical permanent magnet 7 is located at an end of reciprocating mechanism and can rotate around its own axis, and the outside of cylindrical permanent magnet 7 absorbs magnetic grinding medium; Described distance measuring mechanism The infrared ranging sensor 8 is set in the middle to detect the distance of the surface to be processed of the cam workpiece in real time; The driving end of the magnet rotation driving device and the signal output end of the infrared distance measuring sensor in the distance measuring mechanism are respectively connected to the control system.

Described reciprocating mechanism comprises active slide table 2 and driven slide table 17; Active slide table 2 is made up of mobile motor 1, leading screw, leading screw support block and active slide block; The two ends of leading screw are supported by leading screw support block , the lead screw is rotatably connected with the lead screw support block; the end of the lead screw away from the grinding mechanism is connected with the motor shaft of the mobile motor 1 through a coupling 23, and the active slider and the lead screw are connected through a screw drive; 1, the active slider moves back and forth along the screw; the driven slide 17 is composed of an optical axis, an optical axis support block and a driven slider; the optical axis is set parallel to the screw, and the two ends of the optical axis are formed by Supported by the support block, the optical axis is fixedly connected to the optical axis support block, and the driven slider is slidably connected to the optical axis; the active slider and the driven slider are respectively connected to the cam clamping mechanism, and the active slider drives the cam clamping mechanism to move , the driven slider moves along the optical axis synchronously.

As shown in Figure 1, Figure 2 and Figure 4, the cam clamping mechanism is composed of support frame one 3, support frame two, bearing seat 5, installation shaft 33, positioning sleeve 6, locking sleeve 34, large bevel gear 19. The small bevel gear 20 and the cam rotation motor 21 are composed; the support frame one 3 is arranged symmetrically with the support frame two, the bottom of the support frame one 3 is connected with the active slider, and the bottom of the support frame two is connected with the driven slider; the support frame The top of the first 3 and the top of the support frame 2 are respectively provided with a bearing seat 5, and the installation shaft 33 is horizontally arranged, and the two ends of the installation shaft 33 are rotationally connected with the bearing seat 5 at the corresponding end; the cam workpiece 4 and the installation shaft 33 are driven by a key, The positioning bushing 6 and the locking bushing 34 are respectively arranged on the mounting shaft 33 on both sides of the cam workpiece 4, and the positioning bushing 6, the locking bushing 34 and the mounting shaft 33 are all connected by threads, and the positioning bushing 6. After adjusting the position of the cam workpiece 4 on the installation shaft 33, it is locked and fixed by the locking sleeve 34; one end of the installation shaft 33 stretches out of the bearing seat 5, and the extended end is provided with a large bevel gear 19, a large bevel gear 19 Mesh transmission with bevel pinion gear 20, bevel pinion gear 20 is arranged on the motor shaft of cam rotation motor 21; Under the effect of cam rotation motor 21, installation shaft 33 drives cam workpiece 4 to rotate around its own axis.

As shown in Figure 3, described grinding mechanism is made up of support frame 30, cylindrical permanent magnet 7, magnetic grinding medium, belt transmission mechanism and permanent magnet rotating motor 16; Support frame 30 is located on the workbench 18 of reciprocating mechanism one end , the two ends of the top of the support frame 30 are respectively provided with bearing housings 31, and the cylindrical permanent magnet 7 is arranged on the horizontal central axis, and the two ends of the central axis are rotationally connected with the bearing housings 31 at the corresponding ends, and the magnetic grinding medium is adsorbed on the cylindrical permanent magnets. The outer surface of 7; the central shaft and the cylindrical permanent magnet 7 are coaxially arranged, and one end of the central shaft stretches out from the corresponding bearing seat 31, and the stretched end is provided with a pulley 27; the permanent magnet rotating motor 16 is located on the workbench 18 , the motor shaft is provided with pulley two 29, and the pulley one 27 and the pulley two 29 are connected by a transmission belt 28 to form a belt transmission mechanism; under the effect of the permanent magnet rotating motor 16, the cylindrical permanent magnet 7 rotates around the axis of the central axis, And the turning of the cylindrical permanent magnet 7 is opposite to that of the cam workpiece 4; the length of the cylindrical permanent magnet 7 is greater than the thickness of the cam workpiece 4.

Described ranging mechanism is made up of infrared ranging sensor 8, support column 10 and crossbeam 9; The two ends are supported by the support column 10 at the corresponding end, and the bottom of the support column 10 is fixedly connected with the workbench 18 .

Described control system is made up of PLC controller, control cabinet 11 and control panel; Control cabinet 11 is arranged on the workbench 18, and controller is arranged in control cabinet 11, and the outside of control cabinet 11 is provided with control panel.

A method for grinding a disk cam face based on magnetic grinding, comprising the steps of:

(1) The cam workpiece 4 is installed on the installation shaft 33 in the cam clamping mechanism, and the position of the cam workpiece 4 on the installation shaft 33 is adjusted and fixed by the positioning sleeve 6 and the locking sleeve 34, so that the cam workpiece 4 Centering with the cylindrical permanent magnet 7;

(2) The magnetic abrasive and the water-based grinding liquid are mixed according to a weight ratio of 1:3 to 1.5; 3, stirred evenly, and then adsorbed on the surface of the cylindrical permanent magnet 7;

(3) set the rotating speed of cam rotating motor 21, permanent magnet rotating motor 16 by control panel; One end moves; through the interlocking control of the infrared ranging sensor 8 and the mobile motor 1, the gap between the initial surface to be processed on the cam workpiece 4 and the cylindrical permanent magnet 7 is 0.5-2mm; the cam rotation motor 21 and the permanent magnet are started The rotating motor 16 makes the cam workpiece 4 and the cylindrical permanent magnet 7 relatively rotate, and grinds the working surface of the cam workpiece 4 through magnetic abrasives; during the grinding process, the infrared distance measuring sensor 8 and the mobile motor 1 are interlocked and controlled by the PLC controller , so that the gap between the real-time processing surface of the cam workpiece 4 and the cylindrical permanent magnet 7 is always kept at 0.5-2mm;

(4) After the grinding is completed, the cam rotating motor 21 and the permanent magnet rotating motor 16 stop rotating, and the moving motor 1 reversely rotates to drive the cam workpiece 4 to return to the initial position; unload the cam workpiece 4 and clean and dry it, and measure the cam workpiece 4 roughness of the working surface;

(5) The cylindrical permanent magnet 7 in the grinding mechanism is unloaded, and the magnetic abrasive material adsorbed on it is recovered.

The working principle of the device for grinding the working surface of a disc cam based on magnetic grinding in the present invention is as follows: through the moving motor in the reciprocating mechanism, the lead screw in the active sliding table is driven to rotate forward or reversely, so that the active sliding block Move back and forth along the lead screw, and make the cam clamping mechanism move smoothly along the longitudinal direction of the worktable together with the driven slide; the cam clamping mechanism is equipped with a cam rotating motor to drive the cam workpiece to rotate; the grinding mechanism is equipped with a cylindrical permanent magnet, The cylindrical permanent magnet is driven to rotate by the permanent magnet rotating motor, and the grinding process of the working surface of the cam workpiece is realized through the relative motion between the cylindrical permanent magnet and the cam workpiece. The distance measuring mechanism is equipped with an infrared distance measuring sensor, which is used to measure the distance between it and the surface of the cam workpiece to be processed in real time, and transmit the data to the control system. After analysis and calculation, the control system controls the movement of the moving motor and adjusts the cam workpiece in real time. The position ensures that the working surface of the cam workpiece to be processed and the working gap of the cylindrical permanent magnet remain unchanged, thereby realizing precision grinding.

In order to make the purpose, technical solutions and technical effects of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are now clearly and completely described. However, the embodiments described below are only some embodiments of the present invention, not all embodiments. In combination with the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

【Example】

As shown in Figures 1 and 2, in this embodiment, the device for grinding the working surface of a disc cam based on magnetic grinding includes a worktable 18, a reciprocating mechanism, a cam clamping mechanism, a grinding mechanism, a distance measuring mechanism and a control system , The reciprocating movement mechanism, the grinding mechanism and the distance measuring mechanism are all located on the workbench 18.

In this embodiment, the reciprocating movement mechanism includes the active slide table 2 and the driven slide table 17; the active slide table 2 is composed of a moving motor, a lead screw, a lead screw support block and a drive slide block; the driven slide table 17 is composed of an optical axis, The optical axis support block and the driven slider are composed; the driven slider follows the movement of the driving slider to realize follow-up, and the synchronous action of the two ensures the smooth movement of the cam clamping mechanism. The adjustment of the horizontal distance between the cam workpiece 4 and the cylindrical permanent magnet 7 on the cam clamping mechanism is realized through the forward and reverse movement of the moving motor 1 .

In this embodiment, the cam clamping mechanism includes a support frame 1 , a support frame 2 , a bearing seat 5 , a mounting shaft 33 , a positioning sleeve 6 and a locking sleeve 34 . Bracing frame one 3 and bracing frame two are respectively fixed on corresponding driving slide table 2 in the reciprocating mechanism, driven slide table 17, and the tops of bracing frame one 3 and bracing frame two are bolted bearing block 5. Both ends of the installation shaft 33 are supported by the bearing housing 5, and a bearing 32 is arranged between the installation shaft 33 and the bearing housing 5; the axial position of the cam workpiece 4 on the installation shaft 33 is adjusted by the positioning sleeve 6 and the locking sleeve 34 Locking is fixed, and mounting shaft 33 drives cam workpiece 4 to rotate by key. The cam rotation motor 21 drives the installation shaft 33 to rotate through the bevel gear transmission mechanism, and then drives the cam workpiece 4 to rotate.

In this embodiment, the ranging mechanism includes an infrared ranging sensor 8 , a support column 10 and a beam 9 . The lower end of support column 10 is fixed on the workbench 18, and the upper end is connected by crossbeam 9, and the middle position of crossbeam 9 is installed infrared distance measuring sensor 8, is used for measuring its distance to the surface to be processed in real time of cam workpiece 4, and data transmission to Control System.

In this embodiment, the grinding device includes a support frame 30 , a bearing seat 31 , a cylindrical permanent magnet 7 , a belt transmission mechanism and a permanent magnet rotating motor 16 . The supporting frame 30 is made up of 2 L-shaped brackets, and the 2 brackets are relatively fixed on the workbench 18, and the 2 bearing blocks 31 are respectively fixed on the tops of the 2 brackets by bolts. The cylindrical permanent magnet 7 is supported between two bearing seats 31 through a central shaft. One end of the central shaft stretches out from the bearing seat 31 to connect the pulley one 27. The permanent magnet rotating motor 16 is installed on the workbench 18, and the second pulley 29 is installed on the motor shaft. The first pulley 27 and the second pulley 29 are V-shaped pulleys, which are connected and driven by a V-shaped transmission belt 28 and rotated by the permanent magnet. The motor 16 drives the cylindrical permanent magnet 7 to rotate.

In this embodiment, the control system is used to collect the data detected by the infrared distance measuring sensor 8 in real time and analyze and calculate, and then control the rotation direction and speed of the mobile motor 1, and adjust the position of the cam workpiece 4 in real time, so that the cam workpiece 4 is to be processed. Keep a suitable machining gap between the surface and the cylindrical permanent magnet 7. In this embodiment, the machining gap is 1.5 mm. Simultaneously, the steering and rotating speed of the mobile motor 1 are displayed in real time on the display screen of the control panel. Also be provided with 2 adjustment knobs on the control panel, i.e. speed control knob one 13 and speed control knob two 15, which are respectively used to adjust the output speed of the cam rotation motor 21 and the output speed of the permanent magnet rotation motor 16, and the corresponding speed data are all displayed in on the display. In addition, the control panel is also provided with a start button 12 and an emergency stop button 14 . Mobile motor 1 connects power supply by power line two 24, and cam rotating motor 21 connects power supply by power line one 22, and permanent magnet rotating motor 16 connects power supply by power line three 25. The infrared ranging sensor 8 is connected to the control system by a sensor cable.

In the present embodiment, the method for realizing disc cam working surface grinding based on magnetic grinding specifically includes the following steps:

(1) The cam workpiece 4 is installed on the installation shaft 33, and the axial position of the cam workpiece 4 is adjusted through the positioning sleeve 6 and the locking sleeve 34 so that it is centered with the cylindrical permanent magnet 7.

(2) Mix the magnetic abrasive grains and the water-based abrasive liquid according to the weight ratio of 2:3, stir evenly and then adsorb on the cylindrical permanent magnet 7 .

(3) After turning on the power supply of each part, set the rotating speed of the cam rotating motor 21 and the permanent magnet rotating motor 16 through the control panel. The moving motor 1 adjusts the rotation speed and steering direction in real time through the control system, and moves the cam workpiece 4 so that the working gap between the initial surface to be processed and the cylindrical permanent magnet 7 is 1.5mm, and the two are always guaranteed during the subsequent grinding process. working gap. First start the permanent magnet rotating motor 16 to drive the cylindrical permanent magnet 7 to rotate, then start the cam rotating motor 21 to drive the cam workpiece 4 to rotate slowly, and the direction of rotation of the cylindrical permanent magnet 7 is opposite to that of the cam workpiece 4. The sensor 8 interlocks with the moving motor 1 to adjust the relative position of the cam workpiece 4 and the cylindrical permanent magnet 7, so that the working surface of the cam workpiece 4 can be effectively ground.

(4) After the grinding is completed, the cam clamping mechanism returns to the initial position, the power is turned off, the cam workpiece 4 is removed, the surface is cleaned, dried, and the surface roughness is measured.

(5) The cylindrical permanent magnet 7 on the grinding mechanism is unloaded, and the magnetic abrasive is recovered.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (7)

1. A device based on magnetic grinding to realize disc-shaped cam working surface grinding, is characterized in that, comprises workbench, reciprocating mechanism, cam clamping mechanism, grinding mechanism, distance-measuring mechanism and control system; Described reciprocating mechanism Set on the workbench, it is used to drive the cam clamping mechanism to reciprocate longitudinally along the workbench; the cam clamping mechanism is used to install and drive the cam workpiece to rotate around its own axis; the grinding mechanism includes cylindrical permanent magnets and magnetic grinding medium, a cylindrical permanent magnet is located at one end of the reciprocating mechanism and can rotate around its own axis, and the outer side of the cylindrical permanent magnet absorbs magnetic grinding media; an infrared ranging sensor is set in the distance measuring mechanism to detect in real time that the cam workpiece is waiting The distance of the processing surface; the drive end of the reciprocating drive device in the reciprocating mechanism, the cam rotation drive device in the cam clamping mechanism, the cylindrical permanent magnet rotary drive device in the grinding mechanism, and the infrared sensor in the ranging mechanism The signal output ends of the distance measuring sensors are respectively connected to the control system. 2. A kind of device based on magnetic grinding to realize disc-shaped cam working surface grinding according to claim 1, it is characterized in that, described reciprocating mechanism comprises driving slide table and driven slide table; Drive slide table is driven by moving motor , lead screw, lead screw support block and active slider; the two ends of the lead screw are supported by the lead screw support block, and the lead screw and the lead screw support block are rotatably connected; the end of the lead screw away from the grinding mechanism passes through the coupling The device is connected with the motor shaft of the moving motor, and the active slider and the lead screw are connected through screw transmission; under the action of the moving motor, the active slider moves back and forth along the lead screw; the driven slide is composed of the optical axis, the optical axis support block and the slave Composed of moving sliders; the optical axis and the lead screw are set in parallel, the two ends of the optical axis are supported by the optical axis support block, the optical axis and the optical axis support block are fixedly connected, the driven slider is slidingly connected to the optical axis; the active slider The cam clamping mechanism is respectively connected with the driven slider, and when the active slider drives the cam clamping mechanism to move, the driven slider moves synchronously along the optical axis. 3. A kind of device based on magnetic grinding to realize disc-shaped cam working surface grinding according to claim 1, characterized in that, the cam clamping mechanism is composed of support frame one, support frame two, bearing block, mounting shaft, It consists of a positioning bushing, a locking bushing, a large bevel gear, a small bevel gear and a cam rotation motor; the support frame 1 and the support frame 2 are symmetrically arranged, the bottom of the support frame 1 is connected with the active slider, and the bottom of the support frame 2 is connected with the slave The moving slider is connected; the top of the support frame 1 and the top of the support frame 2 are respectively equipped with bearing seats, the installation shaft is set horizontally, and the two ends of the installation shaft are connected to the bearing seats at the corresponding ends; the cam workpiece and the installation shaft are driven by keys. The positioning bushing and locking bushing are respectively arranged on the mounting shaft on both sides of the cam workpiece, and the positioning bushing, locking bushing and the mounting shaft are all connected by threads, and the cam workpiece is adjusted on the mounting shaft through the positioning bushing. After the position is locked and fixed by the locking sleeve; one end of the installation shaft protrudes out of the bearing seat, and the protruding end is provided with a large bevel gear. On the motor shaft; under the action of the cam rotation motor, the installation shaft drives the cam workpiece to rotate around its own axis. 4. A kind of device based on magnetic grinding to realize disc cam working surface grinding according to claim 1, characterized in that, said grinding mechanism is composed of support frame, cylindrical permanent magnet, magnetic grinding medium, belt transmission mechanism and Composed of permanent magnet rotating motor; the support is set on the workbench at one end of the reciprocating movement mechanism, the top two ends of the support frame are respectively equipped with bearing seats, the cylindrical permanent magnet is set on the horizontal central shaft, and the two ends of the central shaft and the bearings at the corresponding end The seat is rotationally connected, and the magnetic grinding medium is adsorbed on the outer surface of the cylindrical permanent magnet; the central shaft and the cylindrical permanent magnet are coaxially arranged, and one end of the central shaft protrudes from the corresponding bearing seat, and a pulley is provided at the protruding end; the permanent magnet The rotating motor is set on the workbench, and the second pulley is set on the motor shaft, and the first pulley and the second pulley are connected by a transmission belt to form a belt transmission mechanism; under the action of the permanent magnet rotating motor, the cylindrical permanent magnet rotates around the axis of the central axis , and the rotation of the cylindrical permanent magnet is opposite to that of the cam workpiece; the length of the cylindrical permanent magnet is greater than the thickness of the cam workpiece. 5. A kind of device that realizes disc cam face grinding based on magnetic grinding according to claim 1, is characterized in that, described ranging mechanism is made up of infrared ranging sensor, support column and beam; Infrared ranging sensor The infrared ranging sensor is installed on the top of the cylindrical permanent magnet, and the two ends of the beam are supported by the support columns at the corresponding ends, and the bottom of the support column is fixedly connected with the workbench. 6. A kind of device based on magnetic grinding to realize disc cam working surface grinding according to claim 1, is characterized in that, described control system is made up of PLC controller, control cabinet and control panel; On the stage, the controller is set in the control cabinet, and the control panel is set outside the control cabinet. 7. A method for grinding a disk cam working surface based on magnetic grinding, characterized in that, it is realized by any one of the devices as claimed in claims 1 to 6; comprising the steps of: (1) Install the cam workpiece on the installation shaft in the cam clamping mechanism, adjust and fix the position of the cam workpiece on the installation shaft through the coordination of the positioning sleeve and the locking sleeve, so that the cam workpiece is aligned with the cylindrical permanent magnet ; (2) Mix the magnetic abrasive and the water-based grinding liquid according to the weight ratio of 1:3 to 1.5; 3, stir evenly, and then adsorb on the surface of the cylindrical permanent magnet; (3) Set the rotation speed of the cam rotating motor and the permanent magnet rotating motor through the control panel; start the moving motor to make the active sliding table and the driven sliding table move synchronously, and move the cam workpiece to the end of the cylindrical permanent magnet; measure the distance by infrared The interlocking control of the sensor and the moving motor makes the gap between the initial surface to be processed on the cam workpiece and the cylindrical permanent magnet 0.5 ~ 2mm; start the cam rotating motor and the permanent magnet rotating motor, so that the cam workpiece is opposite to the cylindrical permanent magnet Rotate, grind the working surface of the cam workpiece through magnetic abrasives; during the grinding process, the infrared distance measuring sensor and the moving motor are interlocked and controlled by the PLC controller, so that the gap between the real-time processing surface of the cam workpiece and the cylindrical permanent magnet is always maintained In 0.5 ~ 2mm; (4) After the grinding is completed, the cam rotating motor and the permanent magnet rotating motor stop rotating, and the moving motor reversely rotates to drive the cam workpiece to return to the initial position; unload the cam workpiece and clean and dry it, and measure the roughness of the cam workpiece working surface; (5) The cylindrical permanent magnet in the grinding mechanism is removed, and the magnetic abrasives adsorbed on it are recovered.

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