Grinding device

Abstract

A grinding device (100), comprising: a grinding medium disc (1), on which a grinding material is provided; a motion platform (2) bearing the grinding medium disc (1) and driving the grinding medium disc (1) to move along a certain path; a driving mechanism (3) providing driving power for the motion platform (2); a base (4) used for supporting the motion platform (2); and a grinding disc (5) used for keeping a workpiece abutting against the grinding material on the grinding medium disc (1), wherein the path is formed by superimposing a simple harmonic motion along a x-axis and a simple harmonic motion along a y-axis.

Description

A grinding device TECHNICAL FIELD

[0001] The present invention belongs to the field of grinding manufacturing, and particularly relates to a grinding device for polishing an end face.

[0002] BACKGROUND

[0003] Grinding is a process of micro-machining by using abrasive in grinding tools to act on the surface of workpieces, which can provide high-precision and high-quality surface treatment and is widely used in many fields.

[0004] Optical fiber communication is a cornerstone of modern information society. Grinding of the ferrule end face of an optical fiber connector, as an indispensable part of the production of optical fiber connectors, directly affects the stability of optical fiber connection and the quality of communication.

[0005] With the continuous efforts of researchers, the following grinding device schemes have been proposed and widely applied.

[0006] 1) JP6835372B1

[0007] Japanese patent JP6835372B1 discloses a ferrule end face grinding device for optical fiber ferrules, wherein an abrasive sheet is arranged on a grinding disc, and a rotation unit of the grinding device includes a revolution mechanism for revolution of a turntable and a rotation mechanism for rotation of the turntable. Under the joint driving of the revolution mechanism and the rotation mechanism, the grinding trajectory of the grinding device is a circular helix.

[0008] a) Low utilization rate of sandpaper

[0009] Firstly, the abrasive sheet used in this grinding method is mainly circular, and the remaining corners will be discarded after the circular abrasive sheet is cut from the square abrasive sheet roll. There is a serious waste in the cutting process. Then, the circular grinding trajectory also makes the center of the abrasive sheet cannot be fully utilized, causing further waste.

[0010] b) Serious mutual influence

[0011] Due to the revolution and rotation of the grinding medium disc, the grinding areas of all ferrules overlap each other. If a certain area of the abrasive sheet has dust or other impurities, it will affect all the ferrules during the entire grinding process. Also, if a ferrule is installed incorrectly, the protruding ferrule will directly damage the sandpaper. During the grinding movement, the protruding ferrule will continue to damage other areas of the sandpaper, finally leading to large-area failure of the abrasive sheet.

[0012] c) Low number of workpiece loading

[0013] The grinding medium disc is circular, and only one circle of workpieces can be installed on the grinding medium disc, that is, the scheme can only grind one circle of workpieces at a time, and the grinding efficiency is low.

[0014] 2) US6302763B1

[0015] In 2001, US6302763B1 discloses a polishing device, which drives the x and y tables to reciprocate along the first and second paths in a predetermined timing relationship by a main drive motor, so that the polishing member can move along a constant 8-shaped polishing pattern.

[0016] a) Large vertex offset

[0017] To solve the problem of sandpaper waste, the object table is driven forward and backward by a driving motor to improve the utilization rate of sandpaper. However, this linear motion destroys the center symmetry of the original constant 8-shaped motion, making the vertex offset of the polished ferrule end face worse.

[0018] b) Complex driving structure

[0019] The moving platform of this structure uses 3 in total and is driven by two independent driving units, and the overall structure is complex.

[0020] 3) JP5714932B2

[0021] In 2015, Japanese patent JP5714932B2 discloses a grinding device, the grinding disc is arranged in a row, which drives the grinding disc to rotate and do circular motion and drives the grinding clamp to do reciprocating linear motion by two motors respectively, so as to realize grinding operation, and the grinding track is several spiral lines distributed on the sandpaper. This kind of grinding medium disc moves, and the workpiece remains stationary, which can concentrate the mechanism for controlling the grinding precision to the supporting mechanism, and reduce the consumable parts that must be replaced regularly to maintain the grinding precision of the workpiece. It is considered that the ferrule and impurities interact seriously during the grinding process, and the ferrules arranged in parallel each have their own motion area and do not interfere with each other, but the ferrules in different rows have the same motion area, so the ferrules in different rows still interfere with each other.

[0022] a) Large vertex offset

[0023] This grinding method has high utilization rate of sandpaper, but the motion track of drawing a circle while moving linearly destroys the force bearing nature of the circumference of the ferrule end face, so that the vertex offset of the polished ferrule end face is still large.

[0024] b) Low workpiece loading capacity

[0025] In order to solve the problem that the ferrule and impurities affect each other seriously during the grinding process, the ferrules are arranged side by side, and only two rows are arranged, so that the number of ferrules loaded in one grinding is small, and the grinding efficiency is low.

[0026] The motion trajectory of the above scheme is improved based on the circular motion, in order to improve the utilization rate of sandpaper, the circular motion is matched with another motion to realize the traversal of the sandpaper, which on the one hand destroys the center symmetry of the circular motion, and on the other hand, the more motion superposition, will lead to the movement of the grinding mechanism becomes complex.

[0027] Therefore, based on the defects of the above scheme, there is an urgent need for a grinding device that can solve the above problems at the same time. SUMMARY

[0028] The present application provides a kind of grinding device, to solve the problem of low sandpaper utilization rate of existing grinding device, grinding effect is not enough center symmetry (vertex offset is large), end surface curvature is not good, and grinding efficiency is low.

[0029] The present application provides a kind of grinding device, including grinding medium disc, grinding medium disc is provided with grinding material;

[0030] Movement platform, which carries the grinding medium disc, drives the grinding medium disc to move along a certain trajectory;

[0031] Driving mechanism, which provides driving power for the movement platform;

[0032] Base, for supporting the movement platform;

[0033] Grinding disc, the grinding disc is used to keep the workpiece and the grinding material on the grinding medium disc abut;

[0034] The motion trajectory is superimposed by the simple harmonic motion of x-axis and the simple harmonic motion of y-axis.

[0035] Further, the parametric equation of x-axis motion and y-axis motion is Or , wherein w1 / w2 is other positive real number not equal to 0.5, 1, 2.

[0036] Preferably, the relationship between w1 and w2 satisfies: 0.88≤w1 / w2≤1.12.

[0037] Preferably, the relationship between w1 and w2 satisfies: w1 / w2=1.02.

[0038] Preferably, the relationship between w1, a1, a2 and w2 satisfies w1×a1=w2×a2.

[0039] Further, the motion platform comprises a y-axis platform, an x-axis platform and a platform bottom plate, a plurality of groups of first slide rail assemblies arranged along the y-axis direction are arranged between the y-axis platform and the platform bottom plate, and a plurality of groups of second slide rail assemblies arranged along the x-axis direction are arranged between the y-axis platform and the x-axis platform, the first slide rail assembly and the second slide rail assembly each comprise a sliding plate, a slide rail seat and a rolling element; the sliding plate is arranged in parallel with the slide rail seat, and the rolling element is arranged between the sliding plate and the slide rail seat.

[0040] Preferably, the driving mechanism has two groups, each of the driving mechanism comprises a power part, an output part and a slider assembly, the power part provides driving force in the driving mechanism, the output part is connected with the power part and the slider assembly, a slide is arranged on each motion platform, the direction of the slide is perpendicular to the motion direction of the motion platform, the slide penetrates through the thickness direction of the platform, the slider assembly comprises a slider and a slide rail, the slide rail is arranged in parallel with the slide and is fixed on both sides of the slide, the slider has a protruding part in the slide, and the slider is rotatably fixed on the output part.

[0041] Further, the power part is a motor, the motor has a power shaft, the output part is an eccentric wheel, the eccentric wheel comprises a circular disc and an output shaft, the power shaft is located at the center of the circular disc, and the output shaft is located at any radius of the circular disc and is arranged at a distance away from the center.

[0042] Preferably, the driving mechanism has two groups, each of the driving mechanism comprises a power part, an output part and a slider assembly, the power part provides driving force in the driving mechanism, the output part is connected with the power part and the slider assembly, a slide is arranged on each motion platform, the direction of the slide is perpendicular to the motion direction of the motion platform, the slide penetrates through the thickness direction of the platform, the slider assembly comprises a slider and a slide rail, the slide rail is arranged in parallel with the slide and is fixed on both sides of the slide, the slider has a protruding part in the slide, and the slider is rotatably fixed on the output part.

[0043] Preferably, the motion platform comprises a first platform and a platform base, a universal ball is arranged between the first platform and the platform base, the grinding medium disc is arranged on the first platform, the driving mechanism has two groups, each group of driving mechanism comprises a power part, an output part and a slider assembly, the power part provides driving force in the driving mechanism, the output part is connected with the power part and the slider assembly, the slider assembly comprises a slider, the first platform is provided with a first slide rail and a second slide rail perpendicular to each other, the first slide rail is parallel to the y-axis direction, the slider is slidably connected with the first slide rail and the second slide rail respectively, the driving mechanism pushes the first slide rail to move the first platform relative to the platform base along the x-axis direction, and the driving mechanism pushes the second slide rail to move the first platform relative to the platform base along the y-axis direction.

[0044] Further, the power part comprises an x-axis driving motor and a y-axis driving motor, the x-axis driving motor is provided with an x-axis driving gear, the y-axis driving motor is provided with a y-axis driving gear, the output part is an eccentric gear, the x-axis driving gear and the y-axis driving gear are meshed with the corresponding eccentric gears, the eccentric gear comprises a circular gear plate, an output rod and a connecting rod mechanism, the connecting rod mechanism comprises a connecting rod, a push rod and a guide block, one end of the connecting rod is rotatably sleeved on the output rod, the other end of the connecting rod is rotatably connected with one end of the push rod, the other end of the push rod is fixedly connected with the slider, and the push rod is slidably arranged in the guide hole of the first guide block.

[0045] Further, the first platform is further provided with a third slide rail and a fourth slide rail perpendicular to each other, the third slide rail and the first slide rail are arranged in parallel on two sides of the first platform parallel to the x-axis direction, the fourth slide rail and the second slide rail are arranged in parallel on two sides of the first platform parallel to the y-axis direction, the third slide rail and the fourth slide rail are provided with sliders, the sliders are connected with guide rods, the guide rods are slidably arranged in the guide holes of the second guide blocks, and the axes of the guide holes of the first guide blocks and the guide holes of the second guide blocks are on the same straight line.

[0046] Beneficial effects

[0047] In order to realize the center symmetry of the ferrule grinding effect, each movement component of the grinding medium disc needs to be completely center symmetric. The grinding device provided by the application has the characteristics that each movement component of the simple harmonic motion is completely center symmetric, and the grinding device provided by the application can realize the symmetric grinding of the workpiece by only performing the simple harmonic motion of the movement platform, so that the grinding effect of the workpiece is more center symmetric. Meanwhile, the movement trajectory formed by the grinding action has a high degree of traversal of the sandpaper, and the full use of the sandpaper can be realized without additionally increasing other driving devices of straight line motion.

[0048] The researchers found that the grinding trajectory is largely dependent on the frequency of the two simple harmonic motions. When w1 / w2 is equal to 0.5, 1, 2, etc., the movement trajectory is very simple, when w1 / w2 is equal to 1, Equal to , the movement trajectory is a reciprocating line segment or a circle; Not equal to , the movement trajectory is an inclined ellipse; when w1 / w2 is equal to 0.5 or 2, the movement trajectory is an "8" shape, and if the "8" shape grinding trajectory can make the vertex offset small, but when the grinding medium disc grinds the workpiece in this trajectory, the sandpaper utilization rate is very low, resulting in frequent replacement of the sandpaper, which seriously reduces the production efficiency. When w1 / w2 is other values, the movement trajectory is relatively dense, the degree of traversal of the sandpaper is high, the utilization rate of the sandpaper is high, and according to this movement trajectory, the grinding action can be performed only by the simple harmonic motion of the movement platform to realize the symmetric grinding of the workpiece, and other movements such as straight line motion are not needed, which can greatly improve the utilization rate of the sandpaper.

[0049] In addition, due to the difference in frequency between the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis, if the movement distances of the grinding trajectory on the x-axis and the y-axis are very different in the same time, the grinding effect of the workpiece end face at different angles will be greatly different after grinding, resulting in a large difference in the curvature radius of the workpiece end face at different angles. Taking the ferrule of the optical fiber connector as an example, too large and too small curvature radius of the ferrule end face will affect the communication quality, too small curvature radius will exert a large pressure on the optical fiber, and too large curvature radius will not be able to exert pressure on the optical fiber, thereby causing air gap between the connector and the optical fiber end face. When the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis satisfy: 0.88≤w1 / w2≤1.12, the problem of large difference in movement distance of the grinding trajectory on the x-axis and the y-axis can be significantly eliminated, and the grinding curvature of the ferrule end face at different angles can meet the use requirements.

[0050] Finally, in order to further solve the problem of the difference in the curvature of the ferrule end face, the amplitudes of the simple harmonic motion of the x-axis and the y-axis can be different, for example, w1*a1=w2*a2, so that the reciprocating motion in the direction of the fast period is small, thereby coordinating the total distance of the grinding medium disc in the x-axis direction and the total distance of the grinding medium disc in the y-axis direction, so that the grinding degree of each angle of the ferrule end face is consistent, and the optical fiber butt joint is guaranteed to be good. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0052] FIG. 1 is a perspective structural schematic diagram of the grinding device in the present application;

[0053] FIG. 2 is a structural schematic diagram of the motion platform of the two-layer motion platform in embodiment 1;

[0054] FIG. 3 is a partial enlarged view of region A in FIG. 2;

[0055] FIG. 4 is an exploded schematic diagram of the motion platform and the output part in embodiment 1;

[0056] FIG. 5 is a perspective top view of the motion platform and the output part in embodiment 1;

[0057] FIG. 6 is a structural schematic diagram of the output part and the power part of the driving mechanism in embodiment 1;

[0058] FIG. 7 is a grinding track schematic diagram of the grinding device in embodiment 1;

[0059] FIG. 8 is the interference measurement data of the ceramic ferrule end face after grinding;

[0060] FIG. 9 is a structural schematic diagram of the grinding device with single motor driving and gear meshing transmission in embodiment 2;

[0061] FIG. 10 is a front view of the motion platform and the output part in embodiment 3;

[0062] FIG. 11 is a top view of the motion platform and the output part in embodiment 3;

[0063] FIG. 12 is a structural schematic diagram of the connecting rod mechanism in another embodiment;

[0064] FIG. 13 is a structural schematic diagram of the grinding device with single-layer motion platform in another embodiment;

[0065] Fig. 14 is a structural schematic diagram of a grinding device with a push rod driving structure in another embodiment;

[0066] Fig. 15 is a structural schematic diagram of a grinding device with a single motor driving and a belt driving in another embodiment.

[0067] Legend of reference signs:

[0068] 100, grinding device; 1, grinding medium disc; 2, moving platform; 21, y-axis platform; 22, x-axis platform; 221, slide; 23, platform base plate; 24a, first slide rail assembly; 24b, second slide rail assembly; 241, sliding plate; 242, slide rail seat; 243, rolling member; 244, rolling groove; 25, first platform; 251, first slide rail; 253, third slide rail; 254, fourth slide rail; 252, second slide rail; 26, rolling body; 3, driving mechanism; 31, power part; 311, power shaft; 312, driving gear; 313, x-axis driving gear; 314, y-axis driving gear; 32, output part; 321, circular wheel disc; 322, output shaft; 323, first eccentric gear; 3231, first output shaft; 324, second eccentric gear; 3241, second output shaft; 325, circular tooth disc; 326, output rod; 327, connecting rod mechanism; 3271, connecting rod; 3272, push rod; 3273, first guide block; 328, guide rod; 329, second guide block; 33, sliding block assembly; 331, sliding block; 3331, convex part; 332, slide rail; 4, base; 5, grinding disc. DETAILED DESCRIPTION

[0069] In order to make the technical problems solved by the present application, the technical solutions and beneficial effects clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0070] In the description of the present application, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0071] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0072] The grinding device of the present application can be used to grind products with requirements for end face flatness, such as ferrule of fiber connector, stator, rotor, mold pin, bearing parts, etc., which are not listed one by one here. The grinding device in the present application is described below by taking the grinding of the ferrule of fiber connector as an example.

[0073] Embodiment 1

[0074] The present embodiment provides a grinding device 100, as shown in FIG. 1, which comprises a grinding medium disc 1, and the grinding medium disc is provided with grinding material;

[0075] A motion platform 2 carries the grinding medium disc 1 and drives the grinding medium disc 1 to move along a certain trajectory;

[0076] A driving mechanism 3 provides driving power for the motion platform 2;

[0077] A base 4 is used to support the motion platform 2;

[0078] A grinding disc 5 is used to keep the end face of the ferrule in abutment with the grinding material on the grinding medium disc 1;

[0079] The motion trajectory is superimposed by the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis.

[0080] In the present embodiment, the grinding medium disc 1 is square, and the grinding material is cut into square shape. The grinding material is sandpaper. On the one hand, the square grinding material is convenient to cut, and each piece of grinding material only needs to be cut in a straight line; on the other hand, the square grinding material basically has no excess waste material during the cutting process, which can improve the utilization rate of the grinding material.

[0081] In the present embodiment, the grinding device further comprises a lifting platform, and the motion platform is fixed on the lifting platform. The lifting platform can control the lifting of the motion platform, so as to realize the abutment of the end face of the ferrule with the grinding material. In addition, the designer can also control the lifting or lowering of the grinding disc through other devices according to the requirements to realize the abutment of the end face of the ferrule with the grinding material.

[0082] As shown in FIGS. 2-3, the motion platform 2 comprises a y-axis platform 21, an x-axis platform 22, and a platform base plate 23 fixed on the base 4, the driving mechanism 3 drives the y-axis platform 21 to move along the y-axis direction relative to the platform base plate 21, and the driving mechanism 3 drives the x-axis platform 22 to move along the x-axis.

[0083] The motion platform adopts a two-layer motion platform independent motion design, which can conveniently and directly control the motion platform to move along the x-axis and y-axis respectively.

[0084] A plurality of groups of first slide rail assemblies 24a arranged along the y-axis direction are arranged between the y-axis platform 21 and the platform base plate 23, and a plurality of groups of second slide rail assemblies 24b arranged along the x-axis direction are arranged between the y-axis platform 21 and the x-axis platform 22.

[0085] The first slide rail assembly and the second slide rail assembly have the same structure, and the first slide rail assembly is taken as an example for introduction.

[0086] The first slide rail assembly 24a comprises a sliding plate 241, a slide rail seat 242, and a rolling element 243. The sliding plate 241 is fixed on the y-axis platform 21, the slide rail seat 242 is fixed on the platform base plate 23, the sliding plate 241 and the slide rail seat 242 are oppositely arranged, and the rolling element 243 is arranged between the sliding plate 241 and the slide rail seat 242, which plays a role of facilitating sliding and supporting.

[0087] The sliding plate 241 and the slide rail seat 242 are both provided with a rolling groove 244, and the rolling element 243 in the rolling groove 244 is a cylindrical roller. In other embodiments, the rolling element can also be other rolling structures, such as a spherical roller.

[0088] Compared with the spherical roller, the total contact area of the cylindrical roller and the rolling groove is larger, and the slide rail assembly can bear larger load; while the total contact area of the spherical roller and the rolling groove is smaller, and the frictional resistance generated in the sliding process of the slide rail assembly is smaller. The selection of the type of rolling element can be determined according to the actual needs of the technician.

[0089] In a preferred embodiment, there are two drive mechanisms 3, as shown in Figures 4-6. Each drive mechanism 3 includes a power unit 31, an output unit 32, and a slider assembly 33. The power unit 31 provides driving force in the drive mechanism 3. The output unit 32 connects the power unit 31 and the slider assembly 33. Each motion platform (here referring to the y-axis platform or the x-axis platform) is provided with a slide rail 221. The slide rail 221 is perpendicular to the motion direction of the motion platform and extends through the thickness direction of the platform. The slider assembly 33 includes a slider 331 and a slide rail 332. The slide rail 332 is fixedly disposed on the back of the motion platform. The slider 331 is slidably connected to the slide rail 332. Each set of slide rails 332 is arranged parallel to the slide rail 221 and fixed on both sides of the slide rail 221. The slider 331 has a protrusion 3331 in the slide rail 221. The slider 331 is fixed on the output unit 32. In this way, the movement of the power unit 31 drives the slider 331 to move through the output unit 32. The slider 331 drives the motion platform to move along its motion direction.

[0090] The slider assembly and slide rail are designed to ensure that the y-axis platform and the x-axis platform can move independently without affecting each other.

[0091] The power unit 31 is an electric motor with a power shaft 311. The output unit 32 is an eccentric wheel, which includes a circular disc 321 and an output shaft 322. The power shaft 311 is fixed to the center of the circular disc. The output shaft 322 is located at a certain distance d away from the center of the circle on any radius of the circle. The output shaft 322 passes through a hole on the slider 331.

[0092] The combination of the eccentric wheel and the slider assembly can transform the rotational motion of the motor into the linear reciprocating motion of the motion platform, thereby achieving the reciprocating grinding action.

[0093] Of course, in other embodiments, the electric motor can be replaced with a mechanism driven to rotate by other fluid media, such as a pneumatic motor or a hydraulic motor, etc.

[0094] Since the reciprocating linear motion of the y-axis platform and the x-axis platform is derived from the rotation of the motor, the change in the position of the y-axis platform and the x-axis platform over time can be represented by the simple harmonic motion described above.

[0095] Thus, the parametric equations of the reciprocating motion equations between the y-axis and x-axis platforms are expressed as follows: , where x (t) It is the displacement of the x-axis platform along the x-axis direction as a function of time, y (t) y is the displacement of the y-axis platform along the y-axis direction as a function of time; a1 is the amplitude of the x-axis platform's motion; a2 is the amplitude of the y-axis platform's motion; w1 is the rotational speed of the motor driving the x-axis platform; w2 is the rotational speed of the motor driving the y-axis platform; and t is time. is the initial phase of the x-axis platform, is the initial phase of the y-axis platform.

[0096] Since the frequency of the simple harmonic motion of the x-axis and the frequency of the simple harmonic motion of the y-axis are different, it is easy to cause the grinding curvature of the ferrule end face at different angles to have a large difference after grinding is completed. Too large or too small curvature will affect the communication quality. Therefore, in order to avoid this problem as much as possible, w1 and w2 should be as close as possible. The relationship between w1 and w2 can be preferably: 0.88≤w1 / w2≤1.12. When the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis satisfy: 0.88≤w1 / w2≤1.12, the problem of large difference in motion path of the grinding track on the x-axis and the y-axis can be significantly eliminated, and the grinding curvature of the ferrule end face at different angles can meet the use requirements.

[0097] In order to further improve the problem of large curvature difference of the ferrule end face, w1×a1=w2×a2 can be considered. In this way, the reciprocating motion amplitude in the direction with a faster period can be small, so as to coordinate the total path of the grinding medium disc in the x-axis direction and the total path in the y-axis direction. In this way, the grinding degree of the ferrule end face at each angle can be kept consistent, and the good butt joint of the optical fiber butt joint can be ensured.

[0098] More specifically, in the present embodiment, a1=4.9, a2=5, a2 / a1=1.02, and w1 / w2 is preferably 1.02, .

[0099] When w1 / w2=1.02, the motion track is relatively dense, the coverage rate of the motion track on the sandpaper is high, and high utilization rate of the sandpaper can be achieved.

[0100] When the researchers grind the ceramic ferrule with a radius r of 1.25 mm, the motion track of the grinding medium disc at this time is shown in FIG. 7, which forms a roughly square track area of 9.8 mm×10 mm. The motion starting point is located at the center of the square, the motion track is center-symmetric and axis-symmetric, and after several periods, the grinding medium disc returns to the initial position.

[0101] The width of the track in the x-axis direction is determined to be mm, and the width of the track in the y-axis direction is determined to be ​mm, the center-to-center spacing of the ferrules in the x-axis direction is L1 of 12.5 mm, and the center-to-center spacing of the ferrules in the y-axis direction is L2 of 12.3 mm. At this time, the grinding tracks of the ferrules fill the entire sandpaper. After grinding, the sandpaper is divided into multiple relatively independent regions, and the adjacent regions are in contact with each other, and the overall sandpaper utilization is good. In addition, the ceramic ferrules ground by the above track are detected, and the detection results are shown in FIG. 8. The vertex offset consistency is good, the standard deviation of the ten test samples is 1.28, and the vertex offset value is small. The maximum measurement value is 6.19 um, the minimum measurement value is 2.05 um, the average measurement value is 4.7 um, and the overall is within 6 um (the vertex offset allowable range of PC type connector is ≤50 um).

[0102] It can be seen that the grinding medium disc moving according to the above motion track, the ground ferrule has very small vertex offset and good overall consistency. In addition, according to the above motion track, only the simple harmonic motion of the motion platform can be performed to realize the symmetrical grinding of the ferrule, and at the same time, the utilization rate of the sandpaper is greatly improved.

[0103] As for whether to select a sine function or a cosine function in the parametric equation, the designer can decide according to the initial phase of the motor, and it is well known to those skilled in the art that a sine function and a cosine function can be converted to each other.

[0104] Embodiment 2

[0105] The embodiment provides a grinding device, which is different from embodiment 1. In the embodiment, the driving mechanism of the grinding device is a single power source, that is, the motion platform is driven in two directions by a single power source.

[0106] The researchers found that the structure of multiple power sources has some problems. First, the motion of the motion platform requires the cooperation of two different power sources. It is difficult to keep the two different power sources at a relatively stable frequency. Due to the separate control of the two power sources, the consistency in operation is difficult to unify, which makes the motion platform often greatly different from the expected motion track. Second, two power sources mean more structure and pipeline arrangement, making the structure of the grinding device more complex, the cost higher, and the maintenance less convenient.

[0107] Therefore, the embodiment provides a grinding device, which includes a grinding medium disc, a grinding material is arranged on the grinding medium disc; a motion platform, which carries the grinding medium disc and drives the grinding medium disc to move along a determined track; a driving mechanism, which provides driving power for the motion platform; a base, which is used to support the motion platform; and a grinding disc, which is used to keep the ferrule in abutment with the grinding material on the grinding medium disc.

[0108] The motion platform comprises a y-axis platform, an x-axis platform and a platform bottom plate, and one driving mechanism, which comprises a power part, an output part and two groups of slider assemblies.

[0109] As shown in FIG. 9, the motor has a power shaft 311, and the power shaft 311 is provided with a driving gear 312. The output part 32 comprises a first eccentric gear 323 and a second eccentric gear 324. The first eccentric gear 323 has a first output shaft 3231, which is arranged at a distance d1 away from the center of the first eccentric gear 323 at an arbitrary radius of the first eccentric gear 323 and is rotationally connected with a corresponding slider 331. The second eccentric gear 324 has a second output shaft 3241, which is arranged at a distance d2 away from the center of the second eccentric gear 324 at an arbitrary radius of the second eccentric gear 324 and is rotationally connected with another slider 331. The first eccentric gear 323 and the second eccentric gear 324 are simultaneously engaged with the driving gear 312.

[0110] The values of d1 and d2 determine the motion stroke of the motion platform in the y-axis direction and the x-axis direction, respectively. The values of d1 and d2 can be determined according to the requirements of the designer.

[0111] The motor simultaneously drives the two eccentric gears and drives the two groups of slider assemblies to make circular motion. The circular motion of the sliders is converted into the reciprocating linear motion of the motion platform, thereby realizing the reciprocating grinding action.

[0112] In addition, the two eccentric gears are simultaneously driven, so that the two groups of slider assemblies have the same motion state and are coordinated with each other, which is beneficial to realize that the grinding medium disc moves along the pre-designed motion trajectory and achieves better grinding effect.

[0113] At this time, the parametric equations of the motion equation in the y-axis direction and the motion equation in the x-axis direction are The rotational angular velocity w1 of the first eccentric gear is z*w / z1, and the rotational angular velocity w2 of the second eccentric gear is z*w / z2, wherein z is the number of teeth of the driving gear, w is the rotational speed of the motor, and the ratio of the number of teeth of the eccentric gear to the number of teeth of the driving gear determines the rotational angular velocity of the eccentric gear, that is, the rotational frequency.

[0114] In a preferred embodiment, (z1 / z) / (z2 / z)=0.9, and it can also be 0.85, 0.95, 1.05, 1.35, 1.56 and the like. The trajectory formed by these values has a short motion period, and a plurality of motion periods can be completed within a certain grinding time, so that the grinding is more efficient.

[0115] In another embodiment, the driving gears include a first driving gear, a second driving gear, and a chain connecting between the first eccentric gear and the first driving gear and between the second eccentric gear and the second driving gear.

[0116] In another embodiment, the first eccentric gear and the second eccentric gear are simultaneously connected with the driving gears by toothed belts.

[0117] Embodiment 3

[0118] The embodiment provides a grinding device, which is different from the above-mentioned embodiments. In the embodiment, the movement platform of the grinding device is a single-layer platform.

[0119] The grinding device comprises a grinding medium disc, a movement platform, a driving mechanism, and a base. The grinding medium disc is provided with a grinding material. The movement platform carries the grinding medium disc and drives the grinding medium disc to move along a determined track. The driving mechanism provides driving power for the movement platform. The base is used for supporting the movement platform. A grinding disc is used for keeping the ferrule in abutment with the grinding material on the grinding medium disc.

[0120] As shown in FIGS. 10 and 11, the movement platform comprises a first platform 25 and a platform base plate 23. The driving mechanism 3 can drive the first platform 25 to move relative to the platform base plate 23 along the x-axis direction and the x-axis direction. The first platform 25 is provided with a first sliding rail 251 and a second sliding rail 252 which are perpendicular to each other. The first sliding rail 251 is parallel to the y-axis direction. The driving mechanism has two groups. Each group of the driving mechanism 3 comprises a power part 31, an output part 32, and a sliding block assembly 33. The sliding block assembly 33 comprises a sliding block 331. The power part provides driving power in the driving mechanism. The output part is connected with the power part and the sliding block 331. The sliding block 331 is in sliding connection with the first sliding rail 251 and the second sliding rail 252. The driving mechanism 3 pushes the first sliding rail 251, so that the first platform 25 moves relative to the platform base plate along the x-axis direction. The driving mechanism 3 pushes the second sliding rail 252, so that the first platform moves relative to the platform base plate along the y-axis direction.

[0121] In the embodiment, the movement platform adopts a single-layer movement platform design, which greatly simplifies the structure of the movement platform, has good visibility, is more convenient to use and operate, and is more convenient to maintain and repair.

[0122] A plurality of rolling bodies 26 are arranged between the platform base plate 23 and the first platform 25. The upper surface of the platform base plate 23 has corresponding grooves which are the same in shape as the rolling bodies 25. The rolling bodies 26 are arranged in the grooves.

[0123] The rolling bodies play a role in supporting the first platform and facilitate the mutual movement of the y-axis platform and the platform base plate.

[0124] In a preferred embodiment, the rolling bodies 26 are a plurality of universal balls installed in the platform bottom plate 23, which abut against the concave surface on the back of the first platform 25. Compared with the multi-layer platform application, the platform weight is generally borne by the spherical rollers in the slide rails, and due to the limited number of the spherical rollers, the total weight that the multi-layer platform can bear is very limited. However, the universal balls are installed between the first platform and the platform bottom plate, and compared with the structure of the multi-layer platform, the total contact area of the universal balls and the first platform is much larger, so the bearing capacity of the single-layer platform is greatly enhanced.

[0125] The power unit 31 in this example includes an x-axis drive motor and a y-axis drive motor, the x-axis drive motor is provided with an x-axis drive gear 313, the y-axis drive motor is provided with a y-axis drive gear 314, and the output unit is an eccentric gear 323. The x-axis drive gear 313 and the y-axis drive gear 314 are engaged with the corresponding eccentric gears. The eccentric gear includes a circular toothed disc 325, an output rod 326, and a connecting rod mechanism 327. The specific structure of the connecting rod mechanism 327 is shown in FIG. 12. The connecting rod mechanism 327 includes a connecting rod 3271, a push rod 3272, and a guide block 3253. One end of the connecting rod 3271 is rotatably sleeved on the output rod 326. The other end of the connecting rod 3271 is rotatably connected with one end of the push rod 3272. The other end of the push rod 3272 is fixedly connected with a sliding block 331. The push rod 3272 is slidably arranged in the guide hole of a first guide block 3273, and the first guide block 3273 is fixed on the platform bottom plate 23.

[0126] Thus, the connecting rod mechanism can convert the continuous rotation of the drive gear into the linear reciprocating motion of the push rod along the direction of the guide hole, thereby driving the moving platform to continuously move in a certain direction.

[0127] In another embodiment, as shown in FIG. 13, the first platform 25 is further provided with a third slide rail 253 and a fourth slide rail 254 perpendicular to each other. The third slide rail 253 and the first slide rail 251 are arranged in parallel, respectively arranged on the two side surfaces of the first platform 25 parallel to the x-axis direction. The fourth slide rail 254 and the second slide rail 252 are arranged in parallel, respectively arranged on the two side surfaces of the first platform 25 parallel to the y-axis direction. The third slide rail 253 and the fourth slide rail 254 are both provided with a sliding block 331, and the sliding block 331 is connected with a guide rod 328. The guide rod 328 is slidably arranged in the guide hole of a second guide block 329. The axis of the guide hole of the first guide block 3273 and the axis of the guide hole of the second guide block 329 are on the same straight line.

[0128] The four slide rails are symmetrically arranged on the four side surfaces of the first platform, and the movement of the first platform is guided from two opposite sides at the same time, which can greatly reduce the tendency of the first platform to twist due to the force on only one side of the first platform, making the grinding movement more smooth and stable.

[0129] In another embodiment, as shown in Figure 14, the power part 31 can also be an electric push rod, or a hydraulic push rod or a pneumatic push rod, the moving end of the electric push rod is fixedly connected with the sliding block 331, and drives the platform to make reciprocating linear motion.

[0130] In another embodiment, as shown in Figure 15, the moving platform includes a first platform 25 and a platform base plate 23, the driving mechanism 3 can drive the first platform 25 to move relative to the platform base plate 23 along the x-axis direction and the x-axis direction, the first platform 25 is provided with a first sliding rail 251 and a second sliding rail 252 perpendicular to each other, the first sliding rail 251 is parallel to the y-axis direction, the driving mechanism is 1, each group of driving mechanism 3 includes a power part 31, an output part 32 and a sliding block 33, the power part provides driving force in the driving mechanism, the output part is connected with the power part and the sliding block, the sliding block 33 is in sliding connection with the first sliding rail 251 and the second sliding rail 252, the driving mechanism 3 pushes the first sliding rail 251, so that the first platform 25 moves relative to the platform base plate along the x-axis direction, the driving mechanism 3 pushes the second sliding rail 252, so that the first platform moves relative to the platform base plate along the y-axis direction.

[0131] The motor has a power shaft 311, the power shaft 311 is provided with a driving gear 312, the output part 32 includes a first eccentric gear 323 and a second eccentric gear 324, the first eccentric gear 323 has a first output shaft 3231, the first output shaft 3231 is located at any radius of the first eccentric gear 323, is set apart from the center of the circle by a distance d1, and is in rotational connection with the corresponding sliding block 331, the second eccentric gear 324 has a second output shaft 3241, the second output shaft 3241 is located at any radius of the second eccentric gear 324, is set apart from the center of the circle by a distance d2, and is in rotational connection with the other sliding block 331, the first eccentric gear 323 and the second eccentric gear 324 are simultaneously connected with the driving gear 314 by a toothed belt.

[0132] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the foregoing embodiments of the present application have been described in detail, those skilled in the art should understand: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A polishing device, comprising: a polishing medium disc provided with polishing material; a motion platform carrying the polishing medium disc to move along a motion trajectory; a driving mechanism providing driving power for the motion platform; a base supporting the motion platform; a polishing disc for fixing a workpiece and keeping the workpiece in abutment with the polishing material on the polishing medium disc; characterized in that the motion trajectory is formed by superimposing a simple harmonic motion of an x-axis and a simple harmonic motion of a y-axis, the x-axis and the y-axis being perpendicular to each other. w1 and w2 satisfy the relationship: 0.88≤w1 / w2≤1.

12. w1 / w2=1.

02. w1, a1, a2 and w2 satisfy the relationship: w1×a1=w2×a2. The motion platform comprises a y-axis platform, an x-axis platform and a platform base, a plurality of groups of first slide rail assemblies arranged along the y-axis direction are arranged between the y-axis platform and the platform base, a plurality of groups of second slide rail assemblies arranged along the x-axis direction are arranged between the y-axis platform and the x-axis platform, the first slide rail assemblies and the second slide rail assemblies each comprise a sliding plate, a slide rail seat and a rolling element, the sliding plate and the slide rail seat are arranged in parallel, and the rolling element is arranged between the sliding plate and the slide rail seat. The driving mechanism has two groups, each group of the driving mechanism comprises a power part, an output part and a slide block assembly, the power part provides driving power in the driving mechanism, the output part is connected with the power part and the slide block assembly, each motion platform is provided with a slide way, the direction of the slide way is perpendicular to the motion direction of the motion platform, the slide way penetrates through the thickness direction of the platform, the slide block assembly comprises a slide block and a slide rail, the slide rail is arranged in parallel to the slide way and is fixed on both sides of the slide way, the slide block has a protruding part in the slide way, and the slide block is rotatably fixed on the output part.

2. The polishing apparatus according to claim 1, wherein The parametric equation of the simple harmonic motion of the x-axis and the simple harmonic motion of the y-axis is or , wherein w1 / w2 is another positive real number other than 0.5, 1, 2, etc.

3. The abrading device of claim 2, wherein, The power part is a motor, the motor has a power shaft, the output part is an eccentric wheel, the eccentric wheel comprises a circular disc and an output shaft, the power shaft is located at the center of the circular disc, and the output shaft is located on a circular radius and is arranged at a distance away from the center.

4. The abrading device of claim 3, wherein, The driving mechanism has two groups, each group of the driving mechanism comprises a power part, an output part and a slide block assembly, the power part is a motor, the motor has a power shaft, the power shaft is provided with a driving gear, the output part comprises a first eccentric gear and a second eccentric gear, the first eccentric gear has a first output shaft, the first output shaft is located on an arbitrary radius of the first eccentric gear and is arranged at a distance d1 away from the center, and is rotatably connected with a corresponding slide block, the second eccentric gear has a second output shaft, the second output shaft is located on an arbitrary radius of the second eccentric gear and is arranged at a distance d2 away from the center, and is rotatably connected with another slide block, and the first eccentric gear and the second eccentric gear are simultaneously engaged with the driving gear.

5. The abrading device of claim 3, wherein, ​ 6. The abrading device of any one of claims 1-5, wherein, ​ 7. The abrading device of claim 6, wherein, ​ 8. The abrading device of claim 7, wherein, ​ 9. The abrading device of claim 6, wherein, ​ 10. The abrading device of any one of claims 1-5, wherein, The motion platform comprises a first platform and a platform base, a universal ball is arranged between the first platform and the platform base, the grinding medium disc is arranged on the first platform, the driving mechanism has two groups, each group of driving mechanism comprises a power part, an output part and a slider assembly, the power part provides driving force in the driving mechanism, the output part is connected with the power part and the slider assembly, the slider assembly comprises a slider, the first platform is provided with a first slide rail and a second slide rail perpendicular to each other, the first slide rail is parallel to the y-axis direction, the slider is slidably connected with the first slide rail and the second slide rail respectively, the driving mechanism pushes the first slide rail, so that the first platform moves relative to the platform base along the x-axis direction, the driving mechanism pushes the second slide rail, so that the first platform moves relative to the platform base along the y-axis direction.

11. The abrading device of claim 10, wherein, The power part comprises an x-axis driving motor and a y-axis driving motor, the x-axis driving motor is provided with an x-axis driving gear, the y-axis driving motor is provided with a y-axis driving gear, the output part is an eccentric gear, the x-axis driving gear and the y-axis driving gear are engaged with the corresponding eccentric gears, the eccentric gear comprises a circular gear plate, an output rod and a connecting rod mechanism, the connecting rod mechanism comprises a connecting rod, a push rod and a guide block, one end of the connecting rod is rotatably sleeved on the output rod, the other end of the connecting rod and one end of the push rod are rotatably connected together, the other end of the push rod is fixedly connected with the slider, the push rod is slidably arranged in the guide hole of the first guide block, and the first guide block is fixed on the platform base.

12. The abrading device of claim 11, wherein, The first platform is also provided with a third slide rail and a fourth slide rail perpendicular to each other, the third slide rail and the first slide rail are arranged in parallel and are arranged on the two sides of the first platform parallel to the x-axis direction respectively, the third slide rail and the fourth slide rail are provided with sliders, the sliders are connected with guide rods, the guide rods are slidably arranged in the guide holes of the second guide blocks, and the axis of the guide hole of the first guide block is on the same straight line with the axis of the guide hole on the second guide block.

Images