An auxiliary wire winding device and control method for a four-roll spindle multi-wire saw

Abstract

The present application relates to four-roll spindle multi-wire cutting technology and equipment field, specifically relates to a kind of for four-roll spindle multi-wire cutting machine auxiliary winding device and control method.Wherein device includes rack platform, 2n regular distribution and parallel guide rails are provided on the rack platform along y direction, n>1;Rack platform is installed with the lock sliding block of normally closed type matched with the one end of guide rail, rack platform is installed with the single-shaft moving platform for driving guide rail movement along x direction by motor control and being connected with the other end of guide rail, the guide rail is uniformly distributed with multiple variable shaft angle roller assembly.This device and control method can make the diamond wire acting on the surface of workpiece completely perpendicular to the axis of four main roller, ensure that the path of the diamond wire is basically unchanged when reciprocating, thereby reducing the wear between main roller axis slot and diamond wire, improving the service life of diamond wire, improving wire cutting quality, reducing cutting loss.

Description

Technical Field

[0001] This invention relates to the field of four-roll spindle multi-wire cutting technology and equipment, specifically to an auxiliary winding device and control method for a four-roll spindle multi-wire cutting machine. Background Technology

[0002] Four-roller multi-wire cutting (4-roller) is a high-efficiency, low-loss machining technology widely used for processing hard and brittle materials such as stone, gemstones, and silicon wafers. This technology typically involves regularly winding abrasive-coated diamond wire around four spindles. As the spindles rotate, the diamond wire reciprocates, grinding the workpiece surface and cutting it into thin slices. During processing, the parallelism and perpendicularity of the diamond wire to the four-roller spindles significantly affect the lifespan of both the spindles and the diamond wire, cutting losses, and surface finish. Therefore, optimizing the winding path of the multi-wire diamond wire is of great value and significance for improving four-roller multi-wire cutting technology.

[0003] In current four-roller multi-wire EDM machines, multiple diamond wires are simply wound around the four spindles. This results in the diamond wires not being perpendicular to the spindle axis, causing friction against the sides of the wire grooves on the spindle during movement, accelerating wear on both the wire grooves and the diamond wires. The greater the spacing between the diamond wires, the greater the degree of deviation from the spindle axis, and the more pronounced the friction with the sides of the wire grooves. Simultaneously, during the drawing process, the load on the two spindles closest to the workpiece changes with the direction of drawing. This change further leads to the diamond wires not being perpendicular to the spindle axis and causes a deflection in the path of the diamond wires acting on the workpiece during reciprocating drawing, resulting in noticeable wire marks on the workpiece surface. This reduces the quality of wire cutting and increases material waste. Therefore, there is an urgent need for an auxiliary winding device. Summary of the Invention

[0004] The purpose of this invention is to provide an auxiliary winding device and control method for a four-roll spindle multi-wire cutting machine, which helps to optimize the control of multi-path diamond wire winding and working path.

[0005] The technical solution of the present invention is as follows: an auxiliary winding device for a four-roller spindle multi-wire cutting machine, the device being installed on a frame platform and having 2n regularly distributed and parallel guide rails arranged along the y-direction, where n>1; a normally closed locking slider cooperating with one end of the guide rail is installed on the frame platform, and a single-axis moving stage connected to the other end of the guide rail and controlled by a motor to drive the guide rail to move along the x-direction is installed on the frame platform, and multiple sets of variable axis angle roller assemblies are evenly distributed on the guide rail.

[0006] Furthermore, the guide rails are distributed below the non-working path diamond wire directly opposite the working path of the diamond wire, and are symmetrically distributed with respect to the vertical plane of the working path of the diamond wire; the 2n guide rails are sequentially sorted, with the first n guide rails distributed at equal intervals, and the last n guide rails also distributed at the same intervals.

[0007] Furthermore, a locking slider mounting base is fixed on the frame platform, and the normally closed locking slider is fixed inside the locking slider mounting base. The normally closed locking slider is provided with an air pressure port for switching the locking state.

[0008] Furthermore, the normally closed locking slider has threaded holes on both sides, which cooperate with the through holes on the locking slider mounting base to achieve bolt connection and fixation.

[0009] Furthermore, the bottom of the single-axis moving stage is fixedly connected to the frame platform, and the other end of the guide rail has a through hole, which is used to connect and fix the guide rail with the threaded hole on the single-axis moving stage.

[0010] Furthermore, the variable axis angle roller assembly includes a variable axis angle roller frame, the upper part of which has a roller mounting bracket with a variable angle, and the roller mounting bracket is rotatably connected to a roller via a bearing rod.

[0011] Furthermore, the lower structure of the variable shaft angle roller frame is fitted with the guide rail contour and has through holes and threaded holes on the guide rail for bolt connection and fixation; the bearing rod passes through the roller mounting frame and the end of the roller mounting frame is fitted with a bearing that is interference fit with the roller, and the bearing is locked to the bearing rod by a self-locking nut.

[0012] Furthermore, a set of identical variable axis angle roller assemblies are mounted on the same guide rail; the mounting direction of the variable axis angle roller assembly on the first n guide rails is opposite to the mounting direction on the last n guide rails.

[0013] Furthermore, after installing the variable shaft angle roller assembly, the expected contact points of any diamond wire and multiple sets of variable shaft angle roller assemblies in the y direction are distributed in an approximately parabolic manner on a plane perpendicular to the x direction.

[0014] A control method for an auxiliary winding device for a four-roll spindle multi-wire cutting machine includes an auxiliary winding device for the four-roll spindle multi-wire cutting machine, comprising the following steps:

[0015] Step 1: Apply a certain air pressure to the normally closed locking slider to make it enter the unlocked state; make each motor drive the single-axis moving stage to the initial position, so that the multiple sets of variable axis angle roller assemblies and the expected contact point of the diamond wire are on the same straight line in the top view direction;

[0016] Step 2: After the four-roller spindle winding is completed, the control motor of the frame platform works to raise the frame platform to the designated position and lock it; at this time, the rollers of the variable shaft angle roller assembly are in full contact with the diamond wire and form a certain preload, so that the diamond wire completes one bending.

[0017] Step 3: The motors of 2n single-axis moving stages are working. The first n motors move the first n guide rails along the -x direction to the designated position, and the last n motors move the last n guide rails along the x direction to the designated position. At this time, the path of the diamond wire in the controlled segment is bent twice by the variable axis angle roller assembly.

[0018] Step 4: Release the internal air pressure of the normally closed locking slider to put it into the locked state and lock the guide rail movement; tension the diamond wire and perform multi-wire cutting.

[0019] Furthermore, based on the force conditions between the rollers and the diamond wire, the tilt angle of the roller mounting bracket in each variable shaft angle roller assembly is changed so that the diamond wire is pressed positively onto the roller.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. This device can be used to assist the winding system of a four-roll spindle multi-wire cutting machine, optimizing the winding path of multiple diamond wires and achieving precise control of the working path of the diamond wires. This ensures that during the high-speed movement of the diamond wires on the four main rollers, the diamond wires wound on the main rollers are completely perpendicular to the axis of the main rollers. This guarantees that the diamond wire paths acting on the workpiece during reciprocating stretching are completely overlapping, improving the surface quality of wire cutting, avoiding excessive wear on the workpiece, and reducing the post-processing costs (grinding, polishing, etc.) of the cut material.

[0022] 2. This device can accurately control the working path of multiple diamond wires to be completely perpendicular to the axis of the main roller, that is, the diamond wire is pressed against the groove of the main roller axis, avoiding friction between the diamond wire and the sides of the groove, and improving the service life of the main roller axis groove and the diamond wire.

[0023] 3. The device is assembled and integrated in a modular manner, which can be widely compatible with and optimized for four-roll spindle multi-wire cutting machines in a flexible way.

[0024] 4. The control system of this device can operate and control completely independently, reducing the difficulty of upgrading and modifying the four-roll spindle multi-wire cutting machine. Attached Figure Description

[0025] Figure 1 This is the overall assembly drawing of the present invention;

[0026] Figure 2This is an assembly diagram showing the relationship between the guide rail and the variable shaft angle roller assembly, the locking slider mounting base, and the normally closed locking slider of the present invention.

[0027] Figure 3 This is a diagram showing the assembly relationship between the guide rail and the single-axis moving stage of the present invention.

[0028] Figure 4 This is an exploded structural diagram of the variable shaft angle roller assembly of the present invention;

[0029] Figure 5 This is a diagram showing the position of the diamond wire in the controlled section of the four-roll spindle multi-wire cutting machine of the present invention;

[0030] Figure 6 This is a diagram illustrating the winding method and effect of the diamond wire in the controlled segment of the present invention on the auxiliary winding device.

[0031] Figure 7 For the present invention Figure 6 A diagram illustrating the step-by-step winding effect of medium-diamond wire on an auxiliary winding device;

[0032] Figure 8 This is a force analysis diagram of the roller of the present invention under the action of diamond wire;

[0033] Figure 9 This is a control flowchart of the present invention;

[0034] In the diagram: 1-Guide rail; 11-Through hole; 2-Frame platform; 3-Locking slider mounting base; 31-Through hole; 4-Normally closed locking slider; 41-Threaded hole; 42-Air pressure port; 5-Variable shaft angle roller assembly; 51-Variable shaft angle roller frame; 511-Through hole; 512-Roller mounting bracket; 52-Bearing; 53-Roller; 54-Self-locking nut; 55-Washer; 56-Bearing rod; 6-Single-axis moving table; 61-Threaded hole; 62-Upper slide table; 7-Motor; 8-Diamond wire; 9-Main spindle; 10-Workpiece. Detailed Implementation

[0035] To make the above features and advantages of the present invention more readily understood, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0036] refer to Figures 1 to 9

[0037] An auxiliary winding device for a four-roll spindle multi-wire cutting machine is mainly used to assist the winding system of the four-roll spindle multi-wire cutting machine, ensuring that the diamond wire paths acting on the workpiece 10 during reciprocating stretching are completely overlapped. The device is mounted on a frame platform and has 2n regularly distributed and parallel guide rails 1 along the y-direction, where n>1 and is a natural number; specifically, 6 transversely arranged guide rails are distributed longitudinally at certain intervals. A normally closed locking slider 4, which mates with one end of the guide rail, is mounted on the frame platform. A single-axis moving stage 6, connected to the other end of the guide rail and controlled by a motor 7, is mounted on the frame platform to drive the guide rail to move along the x-direction, facilitating control of the guide rail's movement in a direction parallel to its length. Multiple sets of variable-axis-angle roller assemblies 5 are evenly distributed on the guide rail to optimize the movement paths of the multiple diamond wires.

[0038] In this embodiment, the guide rails are mainly distributed below the non-working path diamond wire 8, which is directly opposite the working path of the diamond wire, and are symmetrically distributed with respect to the vertical plane of the working path of the diamond wire. The 2n guide rails are sequentially arranged, with the first n guide rails evenly spaced and the last n guide rails also evenly spaced. Taking 6 guide rails as an example, the length of this section of diamond wire is 2 m, which can be divided into three sections: A, B, and C, with lengths of 0.25 m, 1.5 m, and 0.25 m respectively. The first three guide rails are evenly spaced with a spacing of 0.25 m; the last three guide rails are also evenly spaced with a spacing of 0.25 m.

[0039] In this embodiment, a locking slider mounting base 3 is fixed on the frame platform. The locking slider mounting base has a U-shaped structure, which facilitates the installation of the normally closed locking slider. The normally closed locking slider is nested and fixed within the locking slider mounting base. The normally closed locking slider is provided with an air pressure port 42 for switching the locking state of the normally closed locking slider. By applying a certain air pressure through the air pressure port, the normally closed locking slider enters the unlocked state; in the unlocked state, the guide rail can move along the x-direction under the drive of the motor on the single-axis moving table.

[0040] In this embodiment, threaded holes 41 are provided on both sides of the normally closed locking slider, and they cooperate with the through holes 31 on the locking slider mounting base to achieve bolt connection and fixation.

[0041] In this embodiment, the bottom of the single-axis moving stage is fixedly connected to the frame platform, and the other end of the guide rail has a through hole 11, which is used in conjunction with the threaded hole 61 on the single-axis moving stage to achieve bolt connection and fixation, so that the other end of the guide rail is fixed to the upper slide 63 of the single-axis moving stage.

[0042] In this embodiment, specifically, 38 identical variable axis angle roller assemblies are installed on each guide rail, with each variable axis angle roller assembly spaced 50 mm apart.

[0043] In this embodiment, the variable axis angle roller assembly includes a variable axis angle roller frame 51, and the upper part of the variable axis angle roller frame has a roller mounting bracket 512 with a variable angle. The roller mounting bracket is rotatably connected to the roller 53 via a bearing rod 56. The mounting axis angle of the roller is changed by changing the tilt angle of the roller mounting bracket.

[0044] In this embodiment, the lower structure of the variable axis angle roller frame mates with the guide rail contour and has a through hole 511 that is bolted to the threaded hole 12 on the guide rail, thereby fixing the variable axis angle roller assembly to the guide rail. The bearing rod passes through the roller mounting bracket, and a bearing 52 with an interference fit to the roller is installed at the end of the roller mounting bracket. A washer 55 is provided between the bearing and the roller mounting bracket, and the bearing is locked to the bearing rod by a self-locking nut 54.

[0045] In this embodiment, a set of identical variable axis angle roller assemblies are mounted on the same guide rail; the mounting direction of the variable axis angle roller assembly on the first n guide rails is opposite to the mounting direction on the last n guide rails.

[0046] In this embodiment, after installing the variable axis angle roller assembly, any diamond wire and the expected contact points on multiple sets of variable axis angle roller assemblies in the y-direction are distributed in an approximately parabolic manner on a plane perpendicular to the x-direction, which is used to achieve the first bending of the diamond wire. For example... Figure 6 Front View.

[0047] A control method for an auxiliary winding device for a four-roll spindle multi-wire cutting machine, comprising the auxiliary winding device for the four-roll spindle multi-wire cutting machine, and the following steps:

[0048] Step 1: State Initialization. Open the solenoid valve on the air pressure port connection pipeline to provide a certain air pressure to the normally closed locking slider, causing it to enter the unlocked state; move each motor to the single-axis moving stage to the initial position, ensuring that the multiple sets of variable axis angle roller assemblies and the expected contact points of the diamond wire are aligned in a straight line in the top-view direction; as shown... Figure 6 Step 1 is shown in the diagram.

[0049] Step 2: After the four-roll spindle winding is completed, the control motor of the machine platform operates, raising the machine platform to the designated position and locking it. At this time, the rollers of the variable shaft angle roller assembly are in full contact with the diamond wire and form a certain preload, causing the diamond wire to complete one bending operation. Figure 6 Step 2 is shown in the diagram.

[0050] Step 3: The motors of the six single-axis moving stages operate. The first three motors move the first three guide rails along the -x direction to the designated position, and the last three motors move the last three guide rails along the x direction to the designated position. At this time, the path of the diamond wire in the controlled segment is bent twice by the variable axis angle roller assembly; as shown...Figure 6 Step 3 is shown in the diagram.

[0051] Step 4: Close the solenoid valve on the air pressure port connection pipeline, release the internal air pressure of the normally closed locking slider, so that the normally closed locking slider enters the locking state and locks the guide rail movement; tension the diamond wire and perform multi-wire cutting.

[0052] In this embodiment, based on the force distribution between the roller and the diamond wire after the secondary bending, the tilt angle of the roller mounting bracket in each variable axis roller assembly is changed so that the resultant force on the roller coincides with the plane perpendicular to the roller axis. At this time, the diamond wire is pressing directly onto the roller.

[0053] In this embodiment, the diamond wire of the controlled segment is directly opposite the diamond wire of the working segment. Through the auxiliary winding device and control system, the secondary bending of the diamond wire B segment can be achieved, so that the diamond wire of the previous working segment is in the same plane, and the diamond wire of the next working segment is in the same plane, with the diamond wire of the next working segment parallel to each other. This ensures that the diamond wire paths acting on the workpiece 10 completely overlap during reciprocating tension.

[0054] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of auxiliary winding devices and control methods for four-roll spindle multi-wire cutting machines based on the teachings of the present invention does not require creative labor. All equivalent changes, modifications, substitutions and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.

Claims

1. An auxiliary winding device for a four-roll spindle multi-wire cutting machine, characterized in that, The device is mounted on a frame platform and has 2n regularly distributed and parallel guide rails along the y-direction, where n > 1. A normally closed locking slider that mates with one end of each guide rail is mounted on the frame platform. A single-axis moving stage, connected to the other end of each guide rail and controlled by a motor, is also mounted on the frame platform to drive the guide rails along the x-direction. Multiple sets of variable-axis angle roller assemblies are evenly distributed on the guide rails. The guide rails are located below the non-working path diamond wire, directly opposite the working path of the diamond wire, and are positioned along the working path of the diamond wire. The vertical planes are symmetrically distributed; the 2n guide rails are sequentially arranged, with the first n guide rails equally spaced and the last n guide rails also equally spaced; a set of identical variable shaft angle roller assemblies are installed on the same guide rail; the installation direction of the variable shaft angle roller assembly on the first n guide rails is opposite to the installation direction on the last n guide rails; after installing the variable shaft angle roller assembly, the expected contact points of any diamond wire and multiple sets of variable shaft angle roller assemblies in the y direction are approximately parabolically distributed on a plane perpendicular to the x direction.

2. The auxiliary winding device for a four-roll spindle multi-wire cutting machine according to claim 1, characterized in that, A locking slider mounting base is fixed on the frame platform. The normally closed locking slider is fixed inside the locking slider mounting base. The normally closed locking slider is provided with an air pressure port to realize the switching of the locking state.

3. The auxiliary winding device for a four-roll spindle multi-wire cutting machine according to claim 2, characterized in that, The normally closed locking slider has threaded holes on both sides, which cooperate with the through holes on the locking slider mounting base to achieve bolt connection and fixation.

4. An auxiliary winding device for a four-roll spindle multi-wire cutting machine according to claim 1 or 3, characterized in that, The bottom of the single-axis moving stage is fixedly connected to the frame platform, and the other end of the guide rail has a through hole, which is used to connect and fix the single-axis moving stage with a threaded hole.

5. An auxiliary winding device for a four-roll spindle multi-wire cutting machine according to claim 1, characterized in that, The variable axis angle roller assembly includes a variable axis angle roller frame, the upper part of which has a roller mounting frame with a variable angle, and the roller mounting frame is rotatably connected to a roller via a bearing rod.

6. An auxiliary winding device for a four-roll spindle multi-wire cutting machine according to claim 5, characterized in that, The lower structure of the variable shaft angle roller frame fits the guide rail contour and has through holes and threaded holes on the guide rail for bolt connection and fixation; the bearing rod passes through the roller mounting frame and the end of the roller mounting frame is fitted with a bearing that is interference fit with the roller, and the bearing is locked to the bearing rod by a self-locking nut.

7. A control method for an auxiliary winding device in a four-roll spindle multi-wire cutting machine, characterized in that, An auxiliary winding device for a four-roll spindle multi-wire cutting machine, as described in claim 5 or 6, comprises the following steps: Step 1: Apply a certain air pressure to the normally closed locking slider to make it enter the unlocked state; make each motor drive the single-axis moving stage to the initial position, so that the multiple sets of variable axis angle roller assemblies and the expected contact point of the diamond wire are on the same straight line in the top view direction; Step 2: After the four-roller spindle winding is completed, the control motor of the frame platform works to raise the frame platform to the designated position and lock it; at this time, the rollers of the variable shaft angle roller assembly are in full contact with the diamond wire and form a certain preload, so that the diamond wire completes one bending. Step 3: The motors of 2n single-axis moving stages are working. The first n motors move the first n guide rails along the -x direction to the designated position, and the last n motors move the last n guide rails along the x direction to the designated position. At this time, the path of the diamond wire in the controlled segment is bent twice by the variable axis angle roller assembly. Step 4: Release the internal air pressure of the normally closed locking slider to put it into the locked state and lock the guide rail movement; tension the diamond wire and perform multi-wire cutting.

8. The control method for an auxiliary winding device for a four-roll spindle multi-wire cutting machine according to claim 7, characterized in that, Based on the force conditions between the rollers and the diamond wire, the tilt angle of the roller mounting bracket in each variable shaft angle roller assembly is changed so that the diamond wire is pressed positively onto the roller.

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