A multi-wire saw apparatus having a wire lowering bow device and a cutting method thereof

Abstract

The present application relates to the technical field of multi-wire sawing, in particular to a multi-wire sawing device with a wire bow reducing device and a sawing method thereof, which is used for processing sintered magnets of rare earth alloy. The multi-wire sawing device and the sawing method can effectively reduce the wire bow of the sawing wire, improve the sawing quality, reduce the time for leveling the last sawing wire, and improve the production efficiency. The wire bow reducing device and the sawing method can especially improve the processing quality of the current multi-wire sawing, effectively reduce the problems of asymmetric and angle deviation of the sawing tile caused by the wire bow, and improve the processing efficiency of the multi-wire device.

Description

Technical Field

[0001] This invention relates to the field of multi-wire cutting technology, specifically to a multi-wire cutting device with a bow-dropping mechanism and a cutting method thereof. The multi-wire cutting device is used to process sintered magnets of rare earth alloys. Background Technology

[0002] Rare earth alloy sintered magnets have excellent properties and are widely used in various fields. The processing of sintered magnets is an important step in their production process. Multi-wire cutting equipment has the advantages of large single-machine output, high processing efficiency and high processing accuracy, and is increasingly being used in the processing of sintered magnets.

[0003] Multi-wire cutting equipment cuts sintered magnets using a set of high-speed reciprocating cutting wires. The cutting wires are tensioned, and during the cutting process, the magnet's movement bends the wires, forming a bow. A larger bow results in higher cutting efficiency because it introduces a greater inclination angle to the cutting wire, leading to a larger cutting force on the magnet and thus higher efficiency. However, a large bow can create significant bending marks on the cut surface, reducing cutting precision (especially for tile cutting). Furthermore, a larger bow increases wire tension, which can cause wire breakage or clamping during cutting and prolongs the time required to flatten the bow, further impacting efficiency.

[0004] Therefore, new multi-wire cutting equipment is needed to improve the aforementioned technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-wire cutting device with a bow-dropping mechanism, the multi-wire cutting device comprising:

[0006] A work platform, which supports the object to be cut and drives the object to move up and down.

[0007] A cutting unit is located above the working platform. The cutting unit includes a supporting rotating component and a cutting wire. The supporting rotating component supports the cutting wire and drives the cutting wire to rotate. The cutting wire is wound around the supporting rotating component to form a cutting mesh above the working platform.

[0008] The bow-down device is located above the cutting mesh and can move up and down relative to the cutting mesh to contact and press down on the cutting mesh.

[0009] According to an embodiment of the present invention, the multi-wire cutting equipment further includes a drive device. The drive device can be disposed in a suitable position, such as the bottom of the work platform, thereby driving the work platform to move in a horizontal or vertical direction.

[0010] According to an embodiment of the present invention, the supporting rotating component includes at least two rods and / or wheels horizontally disposed above the working platform. Preferably, the rods and / or wheels rotate under the action of an external force, for example, rotating around a rotation axis perpendicular to the reciprocating direction of the cutting line.

[0011] According to an embodiment of the present invention, the dimensions of the rods and wheels are not particularly limited, as long as they enable the cutting lines to form a cutting mesh. Preferably, the length of the rods and wheels is equal to or greater than the length of the side of the working platform parallel to the rods or wheels.

[0012] According to an embodiment of the present invention, the supporting rotating member may include three wheel members, such as grooved wheels.

[0013] As an example, the axes of the three wheels are parallel to the working platform and arranged in a triangle: two wheels are horizontally parallel above the working platform, and the third wheel is vertically higher than the two aforementioned grooved wheels. More preferably, the cutting line is wound between the wheels, forming a cutting mesh between the two horizontally parallel wheels.

[0014] According to an embodiment of the present invention, the cutting wire has a certain tension, so that the cutting wire can be kept taut at all times and provide cutting force during cutting.

[0015] According to an embodiment of the present invention, the bow lowering device includes a support frame, on which a cutting block is disposed. The cutting block is located above the wire mesh being cut, and the cutting block is capable of moving up and down on the support frame to change the pressure on the wire mesh being cut.

[0016] According to an embodiment of the present invention, the support frame includes a crossbeam and a guide rail, the accompanying cutting block is disposed at the bottom of the crossbeam, the crossbeam is connected to the guide rail via a slide table, and the crossbeam can slide on the guide rail to drive the accompanying cutting block to move up and down.

[0017] Preferably, the accompanying cutting block is detachably connected to the crossbeam, for example, by snap-fit ​​or by clamp.

[0018] According to an embodiment of the present invention, the accompanying cutting block is made of a material selected from cemented carbide, glass, ceramics, magnets, etc., preferably made of sintered magnets, thereby increasing the loading capacity and improving the cutting efficiency.

[0019] According to an embodiment of the present invention, a counterweight is connected to the bottom of the slide. Preferably, the slide and the counterweight are detachably connected. Those skilled in the art will understand that counterweights of different masses can be replaced as needed.

[0020] According to an embodiment of the present invention, a spring is provided at the end of the crossbeam, the top end of the spring is connected to the guide rail, and the bottom end is connected to the crossbeam; when the crossbeam moves upward to the limit position of the spring, the spring is disconnected from the guide rail, and the crossbeam, the cutting block, the counterweight, and the spring press against the cutting wire mesh.

[0021] Preferably, the length of the crossbeam is adjustable to change the distance between the two end slides.

[0022] According to an embodiment of the present invention, the crossbeam includes two opposing crossbars, each crossbar having a plurality of connection points, and an adjusting rod is provided between the two crossbars. The adjusting rod can be connected to different connection points to change the length of the crossbeam.

[0023] According to an embodiment of the present invention, the bow lowering device further includes a coolant supply mechanism for diverting coolant to the cutting position. Preferably, the coolant supply mechanism is arranged above the cutting wire mesh to spray coolant across the entire cutting wire mesh.

[0024] Preferably, the coolant supply mechanism includes a coolant reservoir and coolant pipes connected to each other, and a spray head is provided on the coolant pipes.

[0025] According to an embodiment of the present invention, the cutting wire may be an electroplated diamond wire, a resin-coated diamond wire, or an oil-sand wire (a cutting method in which steel wire and coolant are a mixture of oil and sand). Preferably, the diameter of the cutting wire is 0.1-0.4 mm, for example, 0.2-0.3 mm.

[0026] According to an embodiment of the present invention, the number of cutting lines is not particularly limited, and those skilled in the art can determine the number of cutting lines based on the length of the wheel (such as a grooved wheel) and the size to be cut.

[0027] According to an embodiment of the present invention, the cutting line or cutting mesh is preferably parallel to the working platform.

[0028] According to an embodiment of the present invention, the accompanying cutting block can be a grooved wheel parallel to the crossbeam, which can rotate freely around a rotation axis perpendicular to the cutting wire mesh. When the cutting wire mesh is pressed down, it can rotate in both directions with the reciprocating motion of the cutting wire mesh, thereby reducing the consumption of the accompanying cutting block.

[0029] According to an embodiment of the present invention, a linkage mechanism is provided between the crossbeam and the working platform. The crossbeam is connected to the working platform through the linkage mechanism. When the working platform moves vertically upward, it drives the linkage mechanism to move. The linkage mechanism drives the crossbeam to move vertically downward at the same speed as the working platform.

[0030] According to an embodiment of the present invention, the linkage mechanism may be selected, for example, from a gear and rack linkage mechanism and / or a pulley linkage mechanism.

[0031] According to an embodiment of the present invention, the total weight of the pantograph lowering device excluding the guide rail is G, and its calculation formula is as follows:

[0032]

[0033] Where n is the number of cutting lines, H is the planned bow height of the cutting lines, F is the tension of the cutting lines, and L is the distance from the center of the roller to the magnet block.

[0034] The present invention also provides a cutting method, including cutting using the above-described multi-wire cutting equipment.

[0035] According to an embodiment of the present invention, the cutting method includes the following steps:

[0036] S1: Fix the object to be cut on the work platform;

[0037] S2: Push the work platform upwards and adjust the distance between the object to be cut and the cutting wire mesh;

[0038] S3: Drives the cutting unit to move and cut the object to be cut.

[0039] According to an embodiment of the present invention, step S1 includes the following steps: fixing the object to be cut on the top of the work platform, wherein the cutting dimension direction of the object to be cut is placed perpendicular to the cutting line.

[0040] According to an embodiment of the present invention, the object to be cut includes quartz crystal, optical glass, sapphire, single crystal silicon, alloy material, ceramic material, sintered magnet, etc., preferably sintered magnet, such as rare earth sintered magnet.

[0041] According to an embodiment of the present invention, step S2 includes the following steps: pushing the work platform upwards until it contacts or approaches the cutting line on the upper surface of the object to be cut. As an example, the position of the object to be cut can be adjusted so that the distance between the upper surface of the object and the cutting line is 0 to 1 mm, such as 0 to 0.2 mm.

[0042] According to an embodiment of the present invention, before step S3, the following steps are also included: calculating the total weight G of the crossbeam mechanism by substituting the cutting parameters into the calculation formula, converting it into the required mass m of the two counterweights 11, hanging the counterweights on the slide, and suspending the crossbeam mechanism by the spring.

[0043] According to an embodiment of the present invention, step S3 includes the following steps: driving the support rotating component to rotate, causing the cutting line to reciprocate, and pushing the object to be cut vertically upward to cut until the cutting is completed.

[0044] According to an embodiment of the present invention, step S3 further includes the following step: spraying coolant onto the processing area of ​​the wire mesh.

[0045] According to an embodiment of the present invention, after step S3, the following step is further included: repeating steps S1-S3 until all items to be cut are cut.

[0046] According to an embodiment of the present invention, the rotation of the supporting rotating component in step S3 includes alternating forward and reverse rotation, and the rotation speed is 500-1000 m / min, preferably 600-900 m / min, for example 800 m / min.

[0047] According to an embodiment of the present invention, the upward pushing speed of the object to be cut in step S3 is 0.5-1.0 mm / min, preferably 0.6-0.8 mm / min, for example 0.8 mm / min.

[0048] According to an embodiment of the present invention, the rate of coolant injection in step S3 is 40-80 L / min, preferably 50-70 L / min, for example 60 L / min.

[0049] The present invention also provides the use of the multi-wire cutting device with the bow-dropping device for cutting objects selected from the following: quartz crystals, optical glass, sapphire, single crystal silicon, alloy materials, ceramic materials, sintered magnets, etc., preferably sintered magnets, such as rare earth sintered magnets.

[0050] Beneficial effects

[0051] The multi-wire cutting equipment of this invention allows the crossbeam to slide vertically downwards along the sliding guide rail under the action of gravity. This causes the accompanying cutting block to press down and compress the center of the bent cutting wire mesh, thereby eliminating part of the wire bow and causing it to bend in the opposite direction at the center, thus increasing the cutting force. Furthermore, after cutting, the crossbeam can be withdrawn upwards to disengage the accompanying cutting block from the cutting wire mesh. The multi-wire cutting equipment and cutting method of this invention effectively reduce wire bowing, improve cutting quality, reduce the final wire flattening time, and increase production efficiency. The wire bow reduction device and cutting method of this invention particularly improve the processing quality of current multi-wire tile cutting, effectively reducing problems such as asymmetry and warping of cut tiles caused by wire bowing. This invention is simple to operate, safe and reliable, and effectively improves the processing efficiency of multi-wire equipment. Attached Figure Description

[0052] Figure 1 This is a schematic perspective view of the bow lowering device according to Embodiment 1 of the present invention;

[0053] Figure 2 for Figure 1 The main view;

[0054] Figure 3 for Figure 1 Side view;

[0055] Figure 4 This is a schematic diagram illustrating the working principle of Embodiment 1 of the present invention;

[0056] Figure 5 This is a schematic diagram of a cutting wire bow in the prior art.

[0057] The reference numerals in the attached drawings represent the following meanings: 1. Sliding guide rail; 2. Slide table; 3. Crossbeam; 4. Cutting block; 5. Grooved wheel; 6. Cutting line; 7. Working platform; 8. Sintered magnet; 9. Length adjustment rod; 10. Hook; 11. Counterweight; 12. Clamp; 13. Spring. Detailed Implementation

[0058] The structure and application of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0059] The following figures are schematic diagrams used to illustrate the concept of the present invention, showing the shapes of the various parts and their interrelationships. Please note that, to clearly demonstrate the structure of the components in the embodiments of the present invention, the figures are not drawn to the same scale. The same reference numerals are used to denote the same parts.

[0060] The following description, in conjunction with the accompanying drawings, describes an embodiment of a wire bending device for bending the cutting wire of a multi-wire cutting device for sintered magnets. The terms "upper" and "lower" as used below refer to the portion combined with the cutting wire mesh (in... Figure 2 , Figure 3 The horizontal plane (shown by the dashed line in the diagram) is defined as the direction in which the magnet is stationary. Additionally, the term "longitudinal" corresponds to the vertical direction of movement of the work platform, and "lateral" corresponds to the direction perpendicular to it, parallel to the cutting wire mesh. Although the magnet cutting section is preferably planar (in all figures), its cutting end face can be a curved, arc-shaped surface (i.e., a multi-wire tile cutting device). The sintered magnets to be processed are typically rare-earth sintered magnets, such as Nd-based sintered magnets; sintered magnets of other elements can also be used.

[0061] Example 1

[0062] See Figure 1The figure shows an embodiment of the multi-wire cutting device with a bow-dropping device of the present invention, which includes a working platform 7 and a cutting unit. The cutting unit is located above the working platform 7. The working platform 7 is used to store sintered magnets 8, and multiple sintered magnets 8 can be arranged on the working platform 7 and fixed.

[0063] A drive device (not shown) is provided at the bottom of the working platform 7 to drive the working platform 7 to move vertically, for example, upward, so as to push the sintered magnet 8 from the bottom to the working area of ​​the cutting unit so as to complete the cutting process.

[0064] The cutting unit includes a cutting line 6 and a supporting rotating component. The supporting rotating component supports the cutting line 6 and drives the cutting line 6 to rotate. The supporting rotating component supports the cutting line 6 and makes the cutting line 6 form a cutting mesh above the working platform 7. The structure of the supporting rotating component can be set according to actual needs. For example, it can be a rod or wheel that can rotate under the action of external force. The number of rods or wheels can be set according to actual needs, generally greater than or equal to 3. The length of the rod or wheel (such as a grooved wheel) is greater than the length of the side of the working platform 7 parallel to the rod or wheel.

[0065] In this embodiment, the support includes three grooved wheels 5. The axes of the three grooved wheels 5 are parallel to the working platform 7 and are arranged in a triangle: two grooved wheels 5 are arranged horizontally parallel above the working platform 7, and the third grooved wheel 5 is higher in the vertical direction than the aforementioned two grooved wheels 5. Cutting wire 6 is wound between the grooved wheels 5, forming a horizontal cutting wire mesh between the two horizontally parallel grooved wheels 5.

[0066] Driven by the forward and reverse rotation of the grooved wheel 5, the cutting line 6 performs reciprocating linear motion to form a cutting wire saw.

[0067] Above the working platform 7, the bow-lowering device includes a support and a cutting block 4. The support includes a crossbeam 3, which is arranged perpendicular to the cutting line 6. The cutting block 4 is detachably connected to the bottom of the crossbeam 3 and is located above the cutting wire mesh. The cutting block 4 is provided at the bottom of the crossbeam 3. The cutting block 4 is connected to the crossbeam 3, for example, by a snap-fit ​​or clamp. The cutting block 4 can move up and down in the vertical direction. When the cutting block 4 moves down, it can press down on the cutting wire mesh, reduce the bow of the cutting line 6 and ensure the cutting slope of the cutting line 6.

[0068] The two ends of the crossbeam 3 are provided with vertical sliding guide rails 1. The sliding guide rails 1 are used to fix and support the crossbeam 3. The two ends of the crossbeam 3 are connected to the sliding guide rails 1 through the slide table 2. The crossbeam 3 can slide freely up and down in the vertical direction along the sliding guide rails 1, thereby driving the accompanying cutting block 4 to move up and down.

[0069] like Figure 5As shown in the diagram, when the existing multi-wire cutting equipment is cutting, after the cutting wire 6 completely cuts into the sintered magnet 8, a certain wire bow H will be generated. The height distance from the highest point of the bending of the cutting wire 6 to the predetermined horizontal cutting surface (shown by the dotted line in the diagram) is set as H. At this time, the distance from the grooved wheel 5 to the nearest sintered magnet 8 is set as L, the tension of the cutting wire 6 is F, and the number of cutting wires 6 is n. When a weight G is placed at the highest point of the bending of the cutting wire 6, the cutting wire 6 can bend downwards in the opposite direction at this position, thereby obtaining a bending trajectory of the cutting wire 6 with the same slope. The total weight G (in this invention, the total weight G refers to the weight of the bow lowering device excluding the guide rail) can be calculated according to the following formula:

[0070]

[0071] like Figure 3 As shown, the lowering bow device includes two unconnected crossbeams 3, which are connected by a length adjusting rod 9. The two ends of the length adjusting rod 9 are fixed to the crossbeams 3 on both sides by bolts. The crossbeams 3 are provided with multiple connection points, and the length adjusting rod 9 can be connected to different connection points to adjust the overall length of the crossbeams 3, that is, the distance between the two end slides 2, thereby improving the connection between the slides 2 and the sliding guide rail 1. A spring 13 is installed at the top of the end of the crossbeam 3 near the slide table 2. The top of the spring 13 is detachably connected to the top of the sliding guide rail 1. It is used to pull the crossbeam 3 when the sintering magnet 6 is initially cut into the cutting blade to prevent the accompanying cutting block 4 from bending the cutting wire mesh and causing wire breakage. When the cutting wire 6 is completely cut into the sintering magnet 8, the connection between the spring 13 and the sliding guide rail 1 is released under the reaction force of the cutting wire 6 on the accompanying cutting block 4, and the weight of the crossbeam mechanism is completely pressed onto the cutting wire 6. A counterweight 11 is installed at the bottom of the slide table 2. The counterweight 11 is detachably connected to the slide table 2. The counterweight 11 is used to control the total weight of the crossbeam 3, thereby controlling the downward pressure height on the cutting wire mesh. The weight of the counterweight 11 is calculated by empirical formula.

[0072] like Figure 5 As shown, the lowering bow device also includes a spray pipe 14, which is used to spray coolant onto the entire cutting wire, diverting the coolant (e.g., a water-soluble abrasive diluent) from the supply device (not shown) to the area where the cutting wire 6 contacts the magnet 8 for processing; the spray pipe 14 is arranged on the left and right sides of the crossbeam 3, as shown. Figure 5 As shown, coolant can be sprayed through the gap on the side of the crossbeam 3 onto the cutting line 6 of the lower part of the crossbeam 3 that is blocked.

[0073] Example 2

[0074] A method for cutting using the multi-wire cutting equipment with a bow-drop device as described in Embodiment 1 includes the following steps:

[0075] (1) Arrange and fix the sintered magnets 8 to be cut neatly on the work platform 7 (adhesion is used in this embodiment, but other methods such as snap-fit ​​and clamping can also be used for fixing). The sintered magnets 8 to be cut are placed perpendicular to the cutting line 6.

[0076] (2) Push the work platform 7 upwards until the upper surface of the sintered magnet 8 is close to the contact cutting line 6. Adjust the position of the sintered magnet 8 to the horizontal reference plane. At this time, the distance between the upper surface of the sintered magnet 8 and the cutting line 6 is 0-0.2mm.

[0077] (3) Substitute the cutting parameters into the calculation formula to calculate the total weight G of the beam mechanism, convert it into the required mass m of two hammers 11, hang the hammers 11 on the slide table 2, and hang the beam mechanism through the spring 13. In this way, during the initial cutting process, the cutting line 6 is not subjected to the pressure from the cutting block 4 on the beam 3.

[0078] (4) Drive the grooved wheel 5 to rotate in both directions at a certain speed and with the reversing rhythm. Its speed is 500-1000m / min (linear speed) and the rhythm is 0-4 times / min. The cutting line 6 wound between the grooved wheels 5 then performs a reciprocating motion at a certain speed and with the reversing rhythm. The spray pipe 14 sprays coolant toward the processing part of the cutting wire mesh.

[0079] (5) Push the sintered magnet 8 vertically upward at a predetermined speed of 0.5-1.0 mm / min until the cutting is completed.

[0080] (6) Repeat steps S1-S5 until all sintered magnets 8 are cut.

[0081] During the process of pushing the sintered magnet 8 upward at a constant speed from the horizontal reference plane, as the sintered magnet 8 moves, the cutting wire 6 is pushed upward to form a wire bow. The center of the wire bow contacts the accompanying cutting block 4 on the crossbeam 3, and they rub against each other. As the wire bow gets bigger, the force exerted by the cutting wire 6 on the accompanying cutting block 4 becomes greater. When the accompanying cutting block 4 reaches the predetermined force, the spring 13 automatically falls off, and the crossbeam 3 is completely pressed down onto the cutting wire 6. The subsequent cutting process is the preset wire bow lowering cutting process.

[0082] After cutting, the work platform 7 is moved vertically downwards, and the cut sintered magnet 8 is moved from the top to the bottom position. The crossbeam 3 is then moved vertically upwards to exit the cutting line 6. The cut sintered magnets 8 are then sorted and collected.

[0083] The rotational speed of the grooved wheel 5 and the movement speed (or processing speed) of the work platform 7 are not particularly limited; they can be determined based on the characteristics (e.g., hardness) and size of the magnet 8 and the grinding capability of the cutting wire 6. For example, in experiments cutting rare earth sintered magnets (e.g., neodymium iron boron sintered magnets) with cutting wires having electroplated diamond abrasive grains, the rotational speed of the grooved wheel can be in the range of 800 to 10000 rpm, more preferably 1300 to 5000 rpm, and the movement speed can be in the range of 0.1 to 3 mm / min, more preferably 0.4 to 2 mm / min.

[0084] The accompanying cutting block 4 is the same type of sintered magnet 8 to be cut. During the downward pressing of the bow wire, the accompanying cutting block 4 is also cut, which greatly improves the cutting efficiency. The sintered magnet 8 used in the accompanying cutting block 4 can be cut through by adding spacers made of other materials. These spacers can be made of materials such as marble, glass, or asbestos board. They are placed between the sintered magnet accompanying cutting block 4 and the crossbeam. The purpose is that the cutting line can cut through the sintered magnet accompanying cutting block 4, but is fixed in the middle by the spacers and cannot cut the crossbeam, thus avoiding damage to the crossbeam. The spacers can be replaced after each cut.

[0085] When the bow-lowering device of the present invention is in use, a series of sintered magnets 8 are pushed by the working platform 7 to cut through the cutting wire mesh. During the cutting process, the crossbeam 3 clamps the accompanying cutting block 4 and, under the traction of the hammer 11 and the guidance of the sliding guide rail 1, presses down and bends the cutting wire bow, which greatly reduces the bow of the cutting wire 6. The bending slope of the cutting wire 6 remains unchanged, the bending span is smaller and there is reverse bending, which increases the vertical force on the cutting wire 6. The smaller bow improves the processing accuracy and the state of the cutting surface, thereby significantly improving the cutting efficiency and processing accuracy of the magnets, and especially significantly improving the symmetry and warping problems of the cut tiles.

[0086] Example 3

[0087] The sintered magnet 8 was cut using the multi-wire cutting equipment of Example 1 and the cutting method of Example 2.

[0088] Among them, the sintered magnet 8 is a neodymium iron boron sintered magnet block (50mm*20mm*40mm) with a rectangular cross section, and all surfaces of the sintered magnet 8 are ground to an accuracy of ±0.1mm.

[0089] Cutting wire 6 is made of 0.2mm diameter electroplated diamond wire to complete the sharpening process.

[0090] Coolant: A water-soluble inorganic salt diluent.

[0091] The wire bow H = 15mm; distance L = 80mm; tension F = 26N; number of cutting wires n = 90, corresponding to the total weight of crossbeam 3 G = 877N, and the weight of the two counterweights 11 is 34kg.

[0092] (1) Stack 6 layers of sintered magnets 8 with a thickness of 20mm and arrange them in 4 columns with a length of 50mm, distributed on both sides of the working platform 7. Place 5 rows of 40mm cutting dimensions along the direction of the grooved wheel 5.

[0093] (2) Push the work platform 7 upwards until the upper surface of the sintered magnet 8 is close to the contact cutting line 6, and adjust the position of the sintered magnet 8 to the horizontal reference plane.

[0094] (3) Hang the weight 11 on the slide table 2 and suspend the crossbeam mechanism by the spring 13.

[0095] (4) Drive the groove wheel 5 to rotate alternately in the forward and reverse directions at a speed of 800 m / min. The cutting line 6 wrapped between the groove wheels 5 reciprocates accordingly. The spray pipe 14 sprays coolant toward the processing part of the cutting wire mesh at a flow rate of 60 L / min.

[0096] (5) Push the sintered magnet 8 vertically upward at a speed of 0.8 mm / min until the cutting is completed.

[0097] Comparative Example 1

[0098] The methods and materials used in this comparative example are the same as those in Example 3. The difference is that the device in this comparative example does not have the crossbeam 3 equal pressure bow line assembly.

[0099] (1) Stack 6 layers of sintered magnets 8 with a thickness of 20mm and arrange them in 4 columns with a length of 50mm, distributed on both sides of the working platform 7. Place 5 rows of 40mm cutting dimensions along the direction of the grooved wheel 5.

[0100] (2) Push the work platform 7 upwards until the upper surface of the sintered magnet 8 is close to the contact cutting line 6, and adjust the position of the sintered magnet 8 to the horizontal reference plane.

[0101] (3) The drive wheel 5 rotates alternately in the forward and reverse directions at a speed of 800 m / min, and the cutting line 6 wrapped between the wheel 5 reciprocates accordingly. The spray pipe 14 sprays coolant toward the processing part of the cutting wire mesh at a flow rate of 60 L / min.

[0102] (4) Push the sintered magnet 8 vertically upward at a speed of 0.8 mm / min until the cutting is completed.

[0103] Test case

[0104] The cut neodymium iron boron magnets were removed from the work platform 7 of Example 3 and Comparative Example 1 and cleaned to remove the adhesive. 2040 cut neodymium iron boron magnets were obtained from Example 3 and Comparative Example 1 respectively.

[0105] The cutting dimensions and flatness of the cut surface were measured using a digital micrometer and a flatness gauge. The actual measured dimensions of the magnet deviated from the set dimensions by 2 ± 0.03 mm, indicating that the product meets the requirements. The results are as follows:

[0106] Flatness of the cut surface: Example 3 ≤ 0.018 mm; Comparative Example 1 ≤ 0.026 mm.

[0107] Cutting size test data CPK (Complex Process Capability index) (calculated according to the standard of 2±0.03mm): CPK of Example 3 = 2.46; CPK of Comparative Example 1 = 1.39.

[0108] The above demonstrates that the device of the present invention achieves superior dimensional accuracy and processing cross-section compared to the comparative example. Furthermore, in the multi-wire cutting operation performed by the example, the overall cutting cycle is 161 minutes. In contrast, the device of Comparative Example 1, due to its larger wire bow and longer flattening time, has an overall cutting cycle of 195 minutes. Therefore, it can be seen that the device of the present invention is significantly more efficient in multi-wire cutting than the comparative example.

[0109] The specific embodiments of the present invention have been described above by way of example. However, the scope of protection of the present invention is not limited to the above exemplary embodiments. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A multi-wire cutting device with a bow-dropping mechanism, characterized in that, The multi-wire cutting equipment includes: A work platform, which supports the object to be cut and drives the object to move up and down. A cutting unit is located above the working platform. The cutting unit includes a supporting rotating component and a cutting wire. The supporting rotating component supports the cutting wire and drives the cutting wire to rotate. The cutting wire is wound around the supporting rotating component to form a cutting mesh above the working platform. A lowering bow device, located above the cutting mesh, is capable of moving up and down relative to the cutting mesh, contacting the cutting mesh, and pressing down on the cutting mesh; The multi-wire cutting equipment also includes a drive device, which drives the work platform to move in the horizontal or vertical direction. The bow lowering device includes a support frame, on which a cutting block is mounted. The cutting block is located above the cutting mesh and can move up and down on the support frame to change the pressure on the cutting mesh. The support frame includes a crossbeam and a guide rail. The accompanying cutting block is disposed at the bottom of the crossbeam. The crossbeam is connected to the guide rail via a slide table. The crossbeam can slide on the guide rail to drive the accompanying cutting block to move up and down. The accompanying cutting block is detachably connected to the crossbeam. The length of the crossbeam is adjustable to change the distance between the two end slides; the crossbeam includes two opposing crossbars, each crossbar having several connection points, and an adjusting rod is provided between the two crossbars, the adjusting rod being able to connect to different connection points to change the length of the crossbeam; The cutting line or cutting mesh is parallel to the working platform; The accompanying cutting block is a grooved wheel parallel to the crossbeam, which can rotate freely around a rotation axis perpendicular to the cutting mesh. When the cutting mesh is pressed down, it can rotate in both directions with the reciprocating motion of the cutting mesh, which can reduce the consumption of the accompanying cutting block. A linkage mechanism is provided between the crossbeam and the working platform. The crossbeam is connected to the working platform through the linkage mechanism. When the working platform moves vertically upward, it drives the linkage mechanism to move. The linkage mechanism drives the crossbeam to move vertically downward at the same speed as the working platform. The total weight of the pantograph lowering device, excluding the guide rail, is G, and its calculation formula is as follows: Where n is the number of cutting lines, H is the bowing of the wire after the cutting line completely cuts into the sintered magnet, F is the tension of the cutting line, and L is the distance from the slotted wheel to the nearest sintered magnet.

2. The multi-wire cutting equipment according to claim 1, characterized in that, The supporting rotating component includes at least two horizontally arranged rods and / or wheels above the working platform, which rotate under the action of external force.

3. The multi-wire cutting equipment according to claim 2, characterized in that, The rod and / or wheel rotate around a rotation axis perpendicular to the reciprocating direction of the cutting line under the action of external force.

4. The multi-wire cutting equipment according to claim 2, characterized in that, The supporting rotating component includes three wheels.

5. The multi-wire cutting equipment according to claim 4, characterized in that, The wheel is a grooved wheel.

6. The multi-wire cutting equipment according to claim 4, characterized in that, The axes of the three wheels are parallel to the working platform and are arranged in a triangle: two wheels are arranged horizontally parallel above the working platform, and the third wheel is higher than the two wheels in the vertical direction; the cutting line is wound between the wheels and forms a cutting mesh between the two horizontally parallel wheels.

7. The multi-wire cutting equipment according to any one of claims 1-6, characterized in that, The accompanying cutting block is made of a material selected from cemented carbide, glass, ceramics, and magnets.

8. The multi-wire cutting equipment according to claim 7, characterized in that, The accompanying cutting block is made of sintered magnet.

9. The multi-wire cutting equipment according to any one of claims 1-6, characterized in that, A counterweight is connected to the bottom of the slide, and the slide and the counterweight are detachably connected.

10. The multi-wire cutting equipment according to claim 9, characterized in that, A spring is provided at the end of the crossbeam. The top end of the spring is connected to the guide rail, and the bottom end is connected to the crossbeam. When the crossbeam moves upward to the limit position of the spring, the spring is disconnected from the guide rail, and the crossbeam, the accompanying cutting block, the counterweight, and the spring press against the cutting mesh.

11. A cutting method, characterized in that, The cutting method includes cutting using the multi-wire cutting device according to any one of claims 1-10; The cutting method includes the following steps: S1: Fix the object to be cut on the work platform; S2: Push the work platform upwards and adjust the distance between the object to be cut and the cutting mesh; S3: Drives the cutting unit to move and cuts the object to be cut.

12. The cutting method according to claim 11, characterized in that, Before step S3, the following steps are also included: calculate the total weight of the beam mechanism by substituting the cutting parameters into the calculation formula, convert it into the required mass of two counterweights, hang the counterweights on the slide, and suspend the beam mechanism by springs.

13. The cutting method according to claim 11, characterized in that, Step S3 includes the following steps: driving the support rotating component to rotate, causing the cutting line to reciprocate, pushing the object to be cut vertically upward to cut until the cutting is completed, and spraying coolant onto the processing part of the cutting mesh.

14. The use of the multi-wire cutting equipment according to any one of claims 1-10, characterized in that, The multi-wire cutting equipment is used to cut objects selected from the following: quartz crystals, optical glass, sapphire, single-crystal silicon, alloy materials, ceramic materials, and sintered magnets.

15. The use according to claim 14, characterized in that, The multi-wire cutting equipment is used to cut rare earth sintered magnets.

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