Tool retracting method, control system and wire cutting machine

Abstract

The invention provides a tool retracting method, a control system and a wire cutting machine. The tool retracting method comprises the following steps that a tool retracting instruction is obtained; the feeding mechanism drives the cut workpiece to return, and the cutting main roller periodically rotates forwards and backwards, so that the cutting wire net reciprocates; a workpiece returning in-place instruction is obtained, and the cutting main roller stops rotating; and retracting is finished. In the retracting process, the cutting wire net reciprocates according to the set movement distance by controlling the cutting main roller to rotate forwards and backwards, compared with the prior art that the cutting wire net always moves in one direction, the risk that a material sheet is wound into a wire winding groove of the cutting main roller is reduced, and then the wire breaking probability is reduced; and moreover, through multiple times of reciprocating motion of the cutting wire net, the fallen material pieces can fall off from the seams and fall onto the workbench to be cleaned in a concentrated mode, so that the probability of shutdown and manual material piece cleaning in the tool retracting process is reduced, and the tool retracting efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wire cutting, and in particular to a knife retracting method, a control system and a wire cutting machine. Background Art

[0002] Wire cutting equipment refers to equipment that achieves cutting (such as truncation, squaring, slicing, etc.) of the workpiece being cut by relative movement between the cutting wire and the workpiece being cut (such as photovoltaic silicon, sapphire, semiconductors, silicon carbide, magnetic materials, etc.). Taking a slicer as an example, the workpiece being cut is fixed on a feed mechanism, and the feed mechanism drives the workpiece being cut to move toward the cutting wire net to achieve slicing. Sometimes, sheet metal is generated during the cutting process. When the cutter is withdrawn after slicing (that is, the feed mechanism drives the cut piece to move away from the cutting wire net so that the cutting wire withdraws from the slit), the sheet metal will fall onto the cutting wire net and be drawn between the cutting wire and the main cutting roller as the cutting wire net moves, causing the wire to break. In order to reduce the impact of sheet metal on the cutting wire net during the withdrawal process, the traditional withdrawal process generally involves manual real-time observation after the withdrawal is started to see if any sheet metal falls onto the wire net. If so, the machine needs to be stopped manually to manually remove the sheet metal. This operation is inefficient and some sheet metal is inconvenient to clean manually. Therefore, in view of the problems existing in the prior art, a new withdrawal method is urgently needed. Summary of the invention

[0003] In response to the above technical problems, the technical solution of the present invention provides a method for retracting the cutting line, which reduces the risk of the material being drawn into the cutting line and the main cutting roller and causing the line to break by controlling the reciprocating motion of the cutting line, thereby helping to improve cutting efficiency.

[0004] The present invention provides a tool retracting method, comprising the following steps:

[0005] Get the retract instruction;

[0006] The feeding mechanism drives the cut workpiece to retreat, and the main cutting roller periodically rotates forward and reverse to make the cutting wire web reciprocate;

[0007] Obtain the workpiece return instruction, and the cutting main roller stops rotating;

[0008] End retracting.

[0009] Further optimization of the technical solution of the present invention also includes: presetting the reciprocating motion distance of the cutting wire net, and then obtaining a retraction instruction.

[0010] According to a further optimization of the technical solution of the present invention, the preset distance of the reciprocating motion of the cutting wire net is 0.01-0.1m.

[0011] According to a further optimization of the technical solution of the present invention, the maximum reciprocating speed of the cutting wire net is not higher than 20 m / min.

[0012] According to a further optimization of the technical solution of the present invention, the movement speed of the feeding mechanism is 0.01-0.2 m / min.

[0013] Further optimization of the technical solution of the present invention, the acceleration of the cutting wire mesh during reciprocating motion is 5-12.5m / s 2 .

[0014] According to a further optimization of the technical solution of the present invention, the acceleration of the cutting wire web changes in a sinusoidal function during the acceleration or deceleration movement.

[0015] The technical solution of the present invention is further optimized by first starting the spray system after obtaining the tool retraction instruction, and presetting the spray cycle of the spray system to control the flow rate of the cutting fluid sprayed by the spray system according to different tool retraction processes.

[0016] Further optimization of the technical solution of the present invention, the method for setting the spray cycle in the spray system is to divide the spray process into n spray stages according to the thickness of the workpiece to be cut, and the cutting liquid spray flow rate corresponding to each spray stage is L n , where n≥3; when n is an odd number, the relationship between the cutting fluid spray flow rate at different spray stages is (L1=L n) <(L2=L (n-1) )<… <L (n+1) / 2 ; When n is an even number, the relationship between the cutting fluid spray flow rate in different spray stages is (L1=L n) <(L2=L (n-1) )<… <L n / 2 .

[0017] A control system for a wire cutting machine comprises a controller, wherein the controller is provided with a program unit for executing the above-mentioned tool retracting method.

[0018] A wire cutting machine, comprising:

[0019] At least two parallel and side-by-side cutting main rollers, the cutting main rollers are used to wind the cutting wire to form a cutting wire web;

[0020] A workpiece table for fixing the workpiece to be processed;

[0021] A feeding mechanism for driving the workpiece table to move toward or away from the cutting wire web;

[0022] A cutting chamber for fixing the main cutting roller and the feeding mechanism;

[0023] and the control system described above.

[0024] According to a further optimization of the technical solution of the present invention, material receiving mechanisms are respectively provided on both sides of the workpiece table, and the material receiving mechanisms are used to receive the material sheets shaken off the cutting wire net.

[0025] Further optimization of the technical solution of the present invention is that the material receiving mechanism is a material receiving baffle, the material receiving baffle is hinged to the workpiece table through a hinge shaft, and a torsion spring is arranged on the hinge shaft to make the material receiving baffle always close to the cutting main roller; the length of the material receiving baffle is greater than the width of the cutting wire net.

[0026] According to a further optimization of the technical solution of the present invention, the material receiving mechanism is a material receiving baffle, the material receiving baffle is hinged to the workpiece table through a hinge shaft, and the hinge shaft is a damping rotating shaft.

[0027] Compared with the prior art, the advantages of the technical solution of the present invention are:

[0028] During the retracting process, the main cutting roller is controlled to rotate forward and reverse periodically so that the cutting wire net can reciprocate according to the set movement distance. Compared with the prior art in which the cutting wire net always moves in one direction, in the retracting process of the present application, when the material falls onto the cutting wire net, it will not be brought to the position of the main cutting roller by the cutting wire net, which is beneficial to reduce the risk of the material being drawn into the cutting wire and the main cutting roller, thereby reducing the probability of wire breakage; and through the multiple reciprocating motions of the cutting wire net, the cutting wire net forms a shaking effect, which is beneficial to make the fallen material fall off from the cutting wire net under the shaking of the cutting wire net, such as falling into the debris box at the bottom of the cutting wire net or the bottom of the cutting chamber, which is beneficial to reduce the probability of stopping the machine and manually cleaning the material during the retracting process, thereby improving the retracting efficiency and cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0030] Figure 1 It is a schematic flow chart of the tool retraction method in the technical solution of the present invention;

[0031] Figure 2 It is a simplified structural schematic diagram of the wire cutting machine in the technical solution of the present invention;

[0032] Figure 3 It is a schematic diagram of the change of the speed and time of cutting the wire net in the technical solution of the present invention;

[0033] Figure 4 It is a schematic diagram of the change of acceleration and time of the cutting wire mesh movement in the technical solution of the present invention.

[0034] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale.

[0035] Description of labels:

[0036] 1- cutting main roller; 2- cutting wire net; 3- material sheet; 4- workpiece table; 5- feeding mechanism; 6- mounting frame; 7- material receiving baffle. DETAILED DESCRIPTION

[0037] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0039] It should also be noted that the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the product or system including the elements. In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] The following will be combined with the attached Figure 1-2 The present invention is further described.

[0041] A main cutting roller 1 is arranged in the cutting chamber of the wire saw, and a plurality of winding grooves are arranged side by side on the main cutting roller 1. The cutting wire is wound in the winding groove to form a cutting wire net 2. The workpiece to be cut (such as a silicon rod) is fixed on the workpiece table 4, and then driven by the feeding mechanism 5, it moves in the direction close to the cutting wire net 2 to achieve slicing of the workpiece to be cut; when the processing is completed, the feeding mechanism 5 drives the cut workpiece to move in the direction away from the cutting wire net 2, so that the cutting wire net 2 withdraws from the cutting seam to complete the withdrawal. In the existing withdrawal process, the cutting wire moves in a fixed direction (the cutting roller only rotates forward or reversely), and at the same time withdraws the processed workpiece in a direction perpendicular to the movement of the cutting wire net 2 to achieve withdrawal. However, in this process, the sheet 3 that falls onto the cutting wire mesh 2 (in the process of retracting the knife, the processed workpiece may fall off the workpiece table 4 or part of the workpiece fragments may fall off, forming sheet 3, especially for the cutting of magnetic materials fed from bottom to top, because of the properties of magnetic materials, it is easier to produce sheet 3 than slicing photovoltaic silicon, sapphire, etc.) is brought between the cutting line and the cutting main roller 1, causing the line to break. The staff is required to observe in real time during the retracting process. Once the sheet 3 is found to have fallen, it is necessary to stop the machine and take it out in time. This operation reduces the retracting efficiency and cutting efficiency, and is not conducive to the development of cutting automation.

[0042] Therefore, in order to solve this problem, this technical solution provides a new method for retracting the knife, as follows: Figure 1 The following steps are shown:

[0043] Get the retract command.

[0044] Here, "retracting the tool" means that the processed workpiece moves in a direction away from the cutting wire net 2 under the drive of the feeding mechanism 5, so that the processed workpiece gradually separates from the cutting wire net 2 until the processed workpiece is completely separated from the cutting wire net 2. "The direction away from the cutting wire net 2" is a specific direction, which is opposite to the direction of movement of the workpiece when the workpiece is cut.

[0045] The feeding mechanism 5 drives the cut workpiece to retreat, and the cutting main roller 1 rotates forward and reverse periodically. At the same time, the retracting and unreeling rollers and the tension wheel also perform synchronous periodic forward and reverse motions with the cutting main roller 1, so that the cutting wire web 2 reciprocates.

[0046] After obtaining the retract instruction, the feed mechanism 5 is controlled to drive the cut workpiece to retract, and the cutting main roller 1 is periodically rotated forward and reversed to make the cutting wire net 2 reciprocate synchronously, so that the cutting wire net 2 forms a shaking effect. "Reciprocating motion" refers to the cutting line in the cutting wire net 2 moving back and forth in its extension direction. For example, the cutting wire net 2 moves clockwise for 0.05m, and then moves counterclockwise for 0.05m, and this is a cycle. Generally, according to the movement speed of the cutting wire net 2, one cycle does not exceed 1 second, and it circulates.

[0047] Even if the sheet 3 falls during the retracting process, due to the reciprocating motion of the cutting wire net 2, the sheet 3 will at most only vibrate back and forth within a certain range with the cutting wire net 2, reducing the possibility of the sheet 3 continuing to move in the cutting wire net 2 toward the cutting main roller 1 (in this case, the sheet 3 will be drawn between the cutting wire and the cutting main roller 1, thereby breaking the cutting wire), which is beneficial to reducing the probability of the sheet 3 being drawn between the cutting wire and the cutting main roller 1, thereby helping to reduce the occurrence of wire breakage; and the vibration of the sheet 3 on the cutting wire net 2 will make it easy for the sheet 3 to fall from the gap between adjacent cutting wires, and then fall to the debris box or the bottom of the cutting chamber at the bottom of the cutting wire net 2.

[0048] The workpiece retraction instruction is obtained, and the cutting main roller 1 stops rotating.

[0049] The feeding position of the feeding mechanism 5 is detected in real time, and the information of whether the feeding mechanism 5 is retracted to the state where the workpiece and the cutting wire net 2 are completely separated is fed back to the controller. If the feeding mechanism 5 drives the workpiece to retract into place, the cutting main roller 1 stops rotating. If it is not in place, the cutting wire net continues to reciprocate.

[0050] The method for detecting the position of the feed mechanism 5 is to set a sensor in the cutting chamber or on the feed mechanism 5 to detect the position of the feed mechanism 5 or the position of the workpiece. The specific detection device can be an infrared sensor, a contact switch, etc. The knife retracting method of the present application is conducive to reducing manual participation and making it easier to achieve automatic knife retracting.

[0051] After completing the above steps, the tool retraction is completed.

[0052] When the workpiece is completely separated from the cutting wire net 2, the wire cutting device can be turned off and subsequent unloading work can be carried out.

[0053] In addition, for the retracting method of the technical solution, before the retracting is started, it also includes: presetting the reciprocating distance of the cutting wire net 2, and then obtaining the retracting instruction to start the retracting work. By setting the reciprocating distance of the cutting wire net 2, it is possible to set a suitable movement distance according to the distance between the cutting main rollers 1, so as to prevent the falling sheet 3 from being thrown into the cutting main roller 1 due to excessive movement distance. Preferably, the preset reciprocating distance of the cutting wire net 2 is 0.01-0.1m, for example, 0.05m, 0.06m, 0.07m, 0.08m, 0.09m or 0.1m, etc.

[0054] In a further optimization of the technical solution of the present invention, the maximum reciprocating speed of the cutting wire net 2 is not higher than 20 m / min, preferably 10-20 m / min. And the absolute value of the acceleration of the cutting wire net 2 during acceleration or deceleration is 5-12.5 m / s 2, preferably 10m / s 2 Setting the acceleration to change in a sinusoidal function is helpful to reduce the damage to the workpiece caused by the change in speed during the reciprocating motion of the cutting line, thereby affecting the cutting quality.

[0055] When moving in a single direction, for example, when the cutting main roller 2 rotates in the positive direction (here, the clockwise direction is the positive direction), Figure 3 The speed of the cutting wire net is controlled to accelerate first, that is, the cutting main roller rotates to drive the cutting wire net to accelerate from a speed of 0 m / min. When the speed reaches the first set value r, taking r = 15 m / min as an example, it moves at a constant speed for a period of time (the time is determined according to the set distance of the retractable wire), and then decelerates to 0 m / min. In the above-mentioned process of accelerating and decelerating the cutting wire net, as shown in FIG. Figure 4 As shown, its acceleration changes in a sinusoidal function, that is, during the acceleration process, the acceleration changes from 0m / s 2 After gradually increasing to the maximum acceleration value, it gradually decreases to 0m / s 2 , at this time the speed reaches the maximum, and the acceleration is also negative during the deceleration process, and its absolute value is also from 0m / s 2 To the maximum value and then to 0m / s 2 , by controlling the acceleration of the cutting wire mesh during acceleration, the cutting wire mesh can be retracted more smoothly. Take the cutting of magnetic materials and feeding from bottom to top as an example. Because the magnetic material has been cut into individual magnetic sheets during the retraction process, and the magnetic sheets are fixed on the workbench below (unlike silicon rod slicing, the silicon rod cutting workbench is above and feeds from top to bottom. The cut silicon sheets naturally droop under the action of gravity), the individual magnetic sheets will tilt under the action of gravity, and all the magnetic sheets will tilt irregularly, resulting in different local friction between the magnetic sheets and the cutting wires at different positions during the retraction process, which can easily generate lateral force, causing the magnetic sheets to be partially damaged and fall off to form sheet 3 (especially when the cutting wire mesh is about to detach from the magnetic material), or causing the entire magnetic sheet to fall off the workbench to form sheet 3. This application controls the acceleration of the cutting wire mesh movement speed so that the acceleration changes from 0m / s 2 Regularly accelerate to the maximum value and then decrease to 0m / s 2 (in the shape of half a cycle of a sine function), which can reduce the lateral friction between the cutting wire mesh and the magnetic sheet during acceleration or deceleration, thereby making the cutting wire mesh more stable and gentle when retracting the knife.

[0056] According to a further optimization of the technical solution of the present invention, the movement speed of the feeding mechanism 5 is 0.1-0.2 m / min.

[0057] In order to improve the efficiency of knife retraction, the cutting liquid spray control is also performed during the knife retraction process of the technical solution. Specifically, after obtaining the knife retraction instruction, the spray system is first started to spray the cutting liquid to the cutting wire net, and then the cutting main roller is started to rotate forward and reverse periodically to reduce the resistance of the cutting wire net when it is started; during the knife retraction process, the spray system is periodically sprayed to make the knife retraction process more stable and save the cutting liquid for spraying. The method for setting the spray cycle in the spray system is to divide the spray process into n spray stages according to the thickness of the magnetic material to be cut, and the cutting liquid spray flow rate corresponding to each spray stage is L n , where n≥3; when n is an odd number, the relationship between the cutting fluid spray flow rate at different spray stages is (L1=L n) <(L2=L (n-1) )<… <L (n+1) / 2 ; When n is an even number, the relationship between the cutting fluid spray flow rate in different spray stages is (L1=L n) <(L2=L (n-1) )<… <L n / 2 The preferred value of n is 3-6. For example, for a 140mm magnetic material, it can be divided into 5 retracting processes of 20mm, 30mm, 40mm, 30mm and 20mm. The corresponding spray cycle n is 5 spraying stages. Then, during the retracting process, when the cutting wire mesh is located in the corresponding retracting section, different amounts of cutting liquid are sprayed. Corresponding to the 5 sections of the 140mm magnetic material, the flow rate of the sprayed cutting liquid is controlled to 25L / min, 37.5L / min, 50L / min, 37.5L / min and 25L / min respectively. The input frequency of the liquid supply pump in the spraying system is controlled and matched with a flow meter to achieve precise control of the amount of cutting liquid.

[0058] A control system for a wire cutting machine includes a controller, wherein the controller is provided with a program unit for executing the tool retracting method described above. When the wire cutting machine is working, the tool retracting process can be controlled by the controller, thereby reducing the intervention of the operator. Moreover, the tool retracting method provided by the technical solution can greatly improve the tool retracting efficiency.

[0059] A wire cutting machine comprises: at least two parallel and side-by-side arranged cutting main rollers 1, which may be a two-roller structure or a three-roller structure distributed in a triangle, the cutting main rollers 1 being used to wind the cutting wire to form a cutting wire net 2; a workpiece table 4 for fixing the workpiece to be processed, which needs to be fixed on the workpiece table 4 before the workpiece is processed; a feeding mechanism 5 for driving the workpiece table 4 to move toward or away from the cutting wire net 2, the feeding mechanism 5 being the main power mechanism during the cutting and retracting process; a cutting chamber for fixing the cutting main rollers 1 and the feeding mechanism 5, taking a magnetic material slicer as an example, two cutting main rollers 1 are installed in parallel in the cutting chamber, the feeding mechanism 5 is fixedly installed on the cutting chamber base below the cutting main rollers 1, and then the workpiece to be processed is fixed on the feeding mechanism 5 through the workpiece table 4; and the control system described above, which can realize the slicing and retracting of the workpiece and the start and stop control during the cutting process under the control of the control system.

[0060] Due to the use of the knife retraction method of the technical solution, the fallen pieces 3 will be shaken off onto the corresponding workpiece table 4 below the cutting wire net 2 during the knife retraction process. Since there is a narrow space between the mounting frame 6 of the feed mechanism 5 and the side wall of the cutting chamber, and between the steel plate shield or accordion cover of the feed mechanism 5 and the mounting frame 6 when the wire cutting machine is designed, the fallen pieces 3 can easily fall into the above-mentioned narrow space, making it inconvenient to clean the pieces 3. To address this problem, Figure 2 As shown, the technical solution is provided with receiving mechanisms on both sides of the workpiece table 4 for receiving the fallen material pieces 3. When the material pieces 3 on the cutting wire net 2 fall, they will be caught by the receiving mechanisms, so as to facilitate unified collection and cleaning. The receiving mechanism is arranged below the cutting wire net 2 to cover the area below the cutting wire net 2. Preferably, the receiving mechanism can be a plate-like structure or a mesh structure.

[0061] In a specific embodiment, the material receiving mechanism is a material receiving baffle 7, the length of the material receiving baffle 7 is not less than the length of the winding groove arranged on the cutting main roller 1, and the width is not less than the distance between the bottom end of the cutting main roller 1 and the side of the workpiece table 4 corresponding to the cutting main roller 1, that is, the distance between one end of the workpiece table 4 close to the cutting main roller 1 and the bottom end of the cutting main roller 1 on that side, so that the material receiving baffle 7 can completely cover the area below the cutting wire net 2. The material receiving baffle 7 is hinged to the workpiece table 4 by an articulated shaft (it can also be set at a fixed angle). Specifically, two first mounting protrusions are arranged at intervals on the side of the material receiving baffle close to the workpiece table, and a first mounting hole is opened on the first mounting protrusion; two corresponding second mounting protrusions are arranged at intervals on the workpiece table, and a second mounting hole is opened on the second mounting protrusion. The articulated shaft passes through all the first mounting holes and the second mounting holes in sequence to realize the articulation of the material receiving baffle and the workpiece table, and is also articulated on the mounting frame 6 of the feeding mechanism 5, which can be replaced, and a torsion spring is sleeved on the articulated shaft to make the material receiving baffle 7 always close to or fit the cutting main roller 1 (specifically, the working state of the torsion spring when in use is that its spring body is sleeved On the hinge shaft, two torsion bars extending from the spring body are in contact with the back side of the material receiving baffle and the outer side surface of the workbench respectively, so that under the action of the rotational force of the conversation body, the torsion bar can always give the material receiving baffle 7 a force approaching the cutting main roller). By setting the torsion spring, the material receiving baffle 7 can be in contact with the lower end of the cutting main roller 1, so that the side of the material receiving baffle 7 away from the hinge shaft can be abutted against the lower end of the cutting main roller 1 (in contact with the cutting main roller 1), thereby preventing the material sheet 3 falling from the cutting wire net 2 from being thrown out from the gap between the cutting main roller 1 and the material receiving baffle 7 under the drive of the cutting wire. The material receiving baffle 7 is in an inclined state, and the gravity of the material sheet can be used to gather the shaken-off material sheet 3 near the worktable 4 for easy cleaning.

[0062] In another embodiment, the material receiving mechanism is a material receiving baffle 7, which is hinged to the workpiece table 4 or connected to the feeding mechanism 5 mounting frame 6 through a hinge shaft, and the hinge shaft is a damping shaft. In this way, the opening angle of the material receiving baffle 7 can be adjusted according to the size of the cutting workpiece, so that the material receiving baffle 7 can completely catch the fallen material piece 3, which is easy to operate.

[0063] Preferably, the material receiving baffle plate 7 in the above two embodiments is made of materials such as wear-resistant steel plate, wear-resistant rubber plate, etc.

[0064] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work should fall within the scope of protection of the present invention.

[0065] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0066] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for withdrawing a tool, characterized in that: The following steps are involved: Get the retract instruction; The feeding mechanism drives the cut workpiece to retreat, and the main cutting roller periodically rotates forward and reverse to make the cutting wire web reciprocate; Obtain the workpiece return instruction, and the cutting main roller stops rotating; End retracting.

2. The knife retraction method according to claim 1, characterized in that: Also includes: Preset the reciprocating distance of the cutting wire net, and then obtain the retract instruction.

3. The tool retraction method according to claim 2, characterized in that: The preset distance of the reciprocating motion of the cutting wire net is 0.01-0.1m.

4. The knife retraction method according to claim 1, characterized in that: The maximum reciprocating speed of the cutting wire net is not higher than 20 m / min.

5. The knife retraction method according to claim 1, characterized in that: The movement speed of the feeding mechanism is 0.01-0.2 m / min.

6. The knife retracting method according to claim 4, characterized in that: The acceleration of the cutting wire net during reciprocating motion is 5-12.5 m / s 2 .

7. The knife retracting method according to claim 6, characterized in that: When the cutting wire mesh is accelerating or decelerating, its acceleration changes in a sinusoidal function.

8. The tool retracting method according to any one of claims 1 to 7, characterized in that: After obtaining the tool retraction instruction, the spray system is started, and the spray cycle of the spray system is pre-set to control the flow rate of the cutting fluid sprayed by the spray system according to different tool retraction processes.

9. The knife retracting method according to claim 8, characterized in that: The method for setting the spray cycle in the spray system is to divide the spray process into n spray stages according to the thickness of the workpiece to be cut, and the cutting fluid spray flow rate corresponding to each spray stage is L n , where n≥3; when n is an odd number, the relationship between the cutting fluid spray flow rate at different spray stages is (L1=L n) <(L2=L (n-1) )<… <L (n+1) / 2 ; When n is an even number, the relationship between the cutting fluid spray flow rate in different spray stages is (L1=L n) <(L2=L (n-1) )<… <L n / 2 .

10. A control system, characterized in that: It comprises a controller, wherein the controller is provided with a program unit for executing the tool retracting method according to any one of claims 1 to 9.

11. A wire cutting machine, characterized in that: include At least two parallel and side-by-side cutting main rollers, the cutting main rollers are used to wind the cutting wire to form a cutting wire web; A workpiece table for fixing the workpiece to be processed; A feeding mechanism for driving the workpiece table to move toward or away from the cutting wire web; A cutting chamber for fixing the main cutting roller and the feeding mechanism; And the control system as claimed in claim 10.

12. The wire cutting machine according to claim 11, characterized in that: Material receiving mechanisms are respectively arranged on both sides of the workpiece table, and the material receiving mechanisms are used to receive the material sheets shaken off from the cutting wire net.

13. The wire cutting machine according to claim 12, characterized in that: The material receiving mechanism is a material receiving baffle, which is hinged on the workpiece table through a hinge shaft, and a torsion spring is arranged on the hinge shaft to make the material receiving baffle always close to the cutting main roller.

14. The wire cutting machine according to claim 12, characterized in that: The material receiving mechanism is a material receiving baffle, the material receiving baffle is hinged on the workpiece table through a hinge shaft, and the hinge shaft is a damping rotating shaft.

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