Squaring machine

Abstract

The utility model relates to a squaring machine which comprises at least one pair of cutting wheel sets, each pair of cutting wheel sets comprises two cutting wheel bodies which are axially arranged in parallel, the periphery of each cutting wheel body is provided with an annular squaring groove and an annular trimming groove which are arranged in parallel, a first cutting line is wound on the squaring grooves of the at least two cutting wheel bodies at the same time, and a second cutting line is wound on the trimming groove of the at least two cutting wheel bodies. The second cutting line is wound on the edge cutting grooves of the at least two cutting wheel bodies at the same time; each pair of cutting wheel sets is used for cutting a cylindrical silicon rod in the axial direction of the cylindrical silicon rod, the first cutting line is used for cutting the silicon rod into a silicon square part and a plate part, and the second cutting line is used for cutting the plate part into a rim charge part and a recycling part. By the adoption of the scheme, the silicon square is cut into the silicon square part, the rim charge part and the recycling part at the same time, one side of the silicon square is cut in place through one set of cutting wheels, two cutting lines are wound around one set of cutting wheels, the number of the needed cutting wheels is reduced by half, the complexity of the whole cutting device is reduced, and the cost of the cutting device is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of single crystal silicon rod squaring, in particular to a squaring machine. Background Art

[0002] The cutting wheel for squaring the monocrystalline silicon rod is used in the squaring machine. The squaring machine is used to square the silicon rod and obtain silicon squares and four scraps. The cut silicon squares are cut into large-sized silicon wafers through wire cutting, and the cut four scraps are recycled, cleaned, crushed and returned to the furnace again. The weight of the four scraps accounts for about 1 / 3 of the weight of the entire silicon rod. The way of recycling the scraps in the furnace reduces the utilization rate of the finished silicon material, resulting in increased costs and waste of resources.

[0003] Therefore, the prior art has a recycling method of cutting the scraps into small-sized silicon wafers, which can improve the utilization rate of finished silicon materials and improve the utilization rate of resources. For example, CN114454359A adopts an integrated cutting method to solve the above problem, and a wire wheel and a cutting wire are added to the squarer to cut the scraps separately, that is, when the squarer squares the silicon rod, the scraps can be cut to form small silicon blocks with a thickness matching the small-sized silicon wafers. However, in this device, the wire wheel used for square cutting and the wire wheel for cutting the scraps into small silicon blocks are independent wire wheels, which makes the modification project of the existing squarer larger and more costly, and the number of wire wheels is more than numerous, which increases the maintenance cost of the device. Utility Model Content

[0004] Based on this, a square cutting machine is provided to improve the problem of complex structure caused by too many cutting wheels of the cutting device when simultaneously cutting out silicon squares and small-sized silicon wafers in the prior art.

[0005] The utility model provides a square cutting machine, comprising at least one pair of cutting wheel assemblies, each pair of cutting wheel assemblies comprising:

[0006] Two axially parallel cutting wheel bodies are provided, and the outer circumference of each cutting wheel body is provided with annular and parallel cutting grooves and edge cutting grooves.

[0007] The first cutting wire is wound around the cutting grooves of the two cutting wheel bodies at the same time.

[0008] The second cutting wire is wound around the cutting grooves of the two cutting wheel bodies at the same time;

[0009] Each pair of cutting wheel groups is used to cut the cylindrical silicon rod along the axial direction of the silicon rod. The first cutting line is used to cut the silicon rod into a silicon square part and a plate part, and the second cutting line is used to cut the plate part into an edge material part and a recovery part.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] In one implementation, the cutting wheel body includes a square cutting groove and at least two edge cutting grooves, and the second cutting wire is wound in one of the edge cutting grooves.

[0012] In one implementation, the intervals between the plurality of trimming grooves are equal, one axial end of the cutting wheel body is provided with a trimming groove, and the other axial end is provided with a square cutting groove.

[0013] In one implementation manner, three cutting grooves are provided, and the cutting wheel assembly includes two cutting wheel bodies.

[0014] In one implementation, the cross-sections of the square cutting groove and the edge cutting groove are both U-shaped.

[0015] In one implementation, two cutting wheel sets are included, and the axes of all cutting wheel bodies included in the two cutting wheel sets are arranged in parallel. The two cutting wheel sets are used to cut two opposite sides of the silicon rod simultaneously.

[0016] In one implementation, four cutting wheel assemblies are included, wherein:

[0017] The axial directions of the cutting wheel bodies included in the two cutting wheel assemblies are arranged parallel to the first direction.

[0018] The axial directions of the cutting wheel bodies included in the other two cutting wheel groups are arranged parallel to the second direction, and the first direction and the second direction are arranged perpendicularly.

[0019] In one implementation, two cutting wheel groups arranged in parallel rotate synchronously and include four cutting wheel bodies, wherein any one cutting wheel body is connected to a driving member and serves as a driving wheel, and the remaining three cutting wheel bodies are driven wheels.

[0020] In one implementation, the squarer further includes a movable pressing member, wherein the pressing member has at least one protruding pressing portion extending toward the silicon rod;

[0021] The pressing part is used for pressing the edge material part and / or the recovery part.

[0022] In one of the implementations, the clamping member is provided with two raised clamping parts, a clearance groove is provided between the two clamping parts, and the two clamping parts are used to simultaneously clamp the edge material part and the recovery part.

[0023] The beneficial effect of the utility model is that a cutting wheel can be installed with the first cutting wire and the second cutting wire at the same time, so the present application can cut the silicon cube into the silicon cube part, the edge material part and the recovery part at the same time, that is, one set of cutting wheels can be used to cut one side of the silicon cube in place and obtain the required edge material part. Therefore, compared with the prior art, a set of cutting wheels is wound around two cutting wires, and the required number of cutting wheels is halved, so that the complexity of the entire cutting device is reduced, and the cost of the cutting device is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a cutting wheel body in one embodiment;

[0025] Figure 2 A schematic diagram of the structure of the arrangement of the cutting wheel group of a square cutting machine in one embodiment;

[0026] Figure 3 A schematic diagram of the cutting arrangement of a cutting wheel assembly and a silicon rod in one embodiment;

[0027] Figure 4 Schematic diagram of the structure of the clamping piece and the silicon rod.

[0028] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0029] 10. Silicon rod; 11. Silicon square part; 12. Plate part; 13. Edge material part; 14. Recovery part;

[0030] 20. Cutting wheel body; 21. Square cutting groove; 22. Edge cutting groove;

[0031] 30, first cutting line; 40, second cutting line;

[0032] 50. Pressing member; 51. Pressing portion; 52. Air-avoiding groove;

[0033] 60. Locating pin. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] When the silicon rod 10 is squared, small silicon wafers can be obtained by cutting the scraps. In order to obtain the silicon square part and the small silicon wafers at the same time, the prior art uses a combination of multiple cutting wheels, that is, a cutting wire is wound around a cutting wheel, and a pair of cutting wheel groups can only cut one position. Therefore, when it is necessary to cut the silicon square part and the small-sized silicon wafers at the same time, two cutting wheel groups are required. The number of cutting wheel groups is twice that of the ordinary squarer structure, which makes the structure of the cutting device too complicated.

[0036] Based on this, the present invention provides a square opening machine, see Figure 1 and Figure 2 , comprising at least one pair of cutting wheel assemblies, each pair of cutting wheel assemblies comprising,

[0037] Two axially parallel cutting wheel bodies 20 are provided, and the outer circumference of each cutting wheel body 20 is provided with a circular and parallel cutting groove 21 and a cutting groove 22.

[0038] The first cutting wire 30 is wound around the cutting grooves 21 of the two cutting wheel bodies 20 at the same time.

[0039] The second cutting wire 40 is wound around the cutting grooves 22 of the two cutting wheel bodies 20 at the same time;

[0040] Each pair of cutting wheel groups is used to cut the cylindrical silicon rod 10 along the axial direction of the silicon rod 10 . The first cutting line 30 is used to cut the silicon rod 10 into a silicon square portion 11 and a plate portion 12 . The second cutting line 40 is used to cut the plate portion 12 into an edge portion 13 and a recovery portion 14 .

[0041] The cutting wheel of the present device has both a square cutting groove 21 and a side cutting groove 22, so that one cutting wheel can be installed with a first cutting line 30 and a second cutting line 40 at the same time. Therefore, the present application can simultaneously cut the silicon square into a silicon square portion 11, a side material portion 13 and a recovery portion 14, that is, a set of cutting wheels can be used to cut one side of the silicon square into place and obtain the required side material portion 13. Therefore, compared with the prior art, a set of cutting wheels is wound around two cutting lines, and the number of cutting wheels required is halved, so that the complexity of the entire cutting device is reduced, and the cost of the cutting device is effectively reduced.

[0042] Specifically, the first cutting wire 30 and the second cutting wire 40 are both diamond wires. Each cutting wheel assembly may include at least two cutting wheel bodies 20, and preferably, each cutting wheel assembly is provided with two cutting wheel bodies 20.

[0043] In some embodiments, see Figure 1The cutting wheel body 20 includes a square cutting groove 21 and at least two edge cutting grooves 22, and the second cutting wire 40 is wound in one of the edge cutting grooves 22. In this way, each cutting wheel uses multiple edge cutting grooves 22, so that the edge cutting grooves 22 can be selected according to needs, that is, the spacing between the square cutting groove 21 and the edge cutting grooves 22 can be adjusted according to the specific size of the silicon square, thereby improving the versatility of the cutting wheel body 20 and increasing the applicable scenarios of the cutting wheel body 20. Adjacent edge cutting grooves 22 are arranged closely.

[0044] In some embodiments, see Figure 1 The spacing between the plurality of trimming grooves 22 is equal, and a trimming groove 22 is provided at one axial end of the cutting wheel body 20, and a square cutting groove 21 is provided at the other end. In this way, a certain distance is ensured between the square cutting groove 21 and the trimming groove 22, which is greater than the spacing between the plurality of trimming grooves 22, and the trimming groove 22 can be conveniently selected, and the distance between the two cutting lines can be conveniently adjusted according to the needs.

[0045] In some embodiments, see Figure 1 , three trimming grooves 22 are provided, and the cutting wheel set includes two cutting wheel bodies 20. In this way, the specific number of the trimming grooves 22 can be adjusted according to the length of the cutting wheel body 20 or the application scenario.

[0046] Specifically, a square cutting groove 21 can be opened 3 mm inward from the outside of the cutting wheel body 20, a trimming groove 22 can be opened 20 mm apart from the square cutting groove 21, and other trimming grooves 22 can be opened around the trimming groove 22, and the spacing between the trimming grooves 22 is 1.5 mm.

[0047] In some embodiments, see Figure 1 The cross sections of the square cutting groove 21 and the edge cutting groove 22 are both U-shaped. In this way, the square cutting groove 21 and the edge cutting groove 22 are both U-shaped grooves, which reduce the contact area between the groove and the cutting line compared to the V-shaped groove, and can prevent the cutting line from breaking; in addition, the U-shaped groove is more wear-resistant than the V-shaped groove and has a longer service life.

[0048] Specifically, the cutting wheel body 20 needs to be coated with a wear-resistant layer on the periphery before use. Aluminum alloy is often used as the material of the cutting wheel body 20, and the coated wear-resistant layer is often a resin wear-resistant layer. After the cutting wheel body 20 is used, the depth of the cutting line in the square cutting groove 21 and the edge cutting groove 22 is regularly observed. If the cutting line is embedded in the U-shaped groove more, it means that the cutting wheel body 20 is seriously worn. At this time, the wear-resistant layer needs to be replaced and repaired. The present application uses a U-shaped groove that is more wear-resistant than a V-shaped groove, thereby reducing the repair frequency of the cutting wheel body 20 and effectively reducing the production cost. In some embodiments, the depth of the U-shaped groove is set to 1.5mm-2mm, and it is designed as a U-shaped groove, which improves wear resistance and prevents the steel wire from falling out during the production process, ensuring smooth production.

[0049] See also Figure 2 and Figure 3 The square cutting machine of the present application includes at least one cutting wheel set.

[0050] The present application adopts at least one cutting wheel set to complete the squaring of the silicon rod 10; that is, when there is only one cutting wheel set, it is necessary to rotate the silicon rod 10 or the cutting wheel set to complete the cutting process on all sides of the silicon rod 10, thereby obtaining a silicon square, four edge material parts 13 and four recovery parts 14.

[0051] In some embodiments, see Figure 2 and Figure 3 , including two cutting wheel sets, the axes of all the cutting wheel bodies 20 included in the two cutting wheel sets are arranged in parallel, and the two cutting wheel sets are used to simultaneously cut the two opposite sides of the silicon rod 10. In this way, the two parallel cutting wheel sets can simultaneously cut the two opposite sides of the silicon rod 10. When there are only two cutting wheel sets, the silicon rod 10 or the two parallel cutting wheel sets can be rotated once to complete the cutting process of the four sides of the silicon rod 10, thereby obtaining a silicon square, four edge material parts 13 and four recovery parts 14.

[0052] In some embodiments, see Figure 2 and Figure 3 , including four cutting wheel groups, wherein: the axial directions of the cutting wheel bodies 20 included in two cutting wheel groups are arranged in parallel along the first direction, the axial directions of the cutting wheel bodies 20 included in the other two cutting wheel groups are arranged in parallel along the second direction, and the first direction and the second direction are arranged perpendicularly. In this way, since two cutting wheel groups including the cutting wheel bodies 20 axially arranged in parallel along the horizontal first direction and two cutting wheel groups including the cutting wheel bodies 20 axially arranged in parallel along the horizontal second direction are provided at the same time, when the silicon rod 10 is cut and squared, the working positions of the silicon rod 10 and the cutting wheel groups do not need to be rotated. When in use, two parallel cutting wheel groups are used to cut two opposite sides of the silicon rod 10 first, and then the other two parallel cutting wheel groups are used to cut the other two opposite sides of the silicon rod 10, thereby completing the cutting process of the four sides of the silicon rod 10 to obtain a silicon square, four edge material parts 13 and four recovery parts 14.

[0053] Specifically, when in use, in the two cutting wheel groups arranged in parallel, the four cutting wheels are arranged in a rectangular shape, wherein one cutting wheel body 20 is a driving wheel, and three cutting wheel bodies 20 are driven wheels.

[0054] In some embodiments, see Figure 2 and Figure 3, the two cutting wheel groups arranged in parallel rotate synchronously and include four cutting wheel bodies 20, wherein any one cutting wheel body 20 is connected to the driving member and serves as a driving wheel, and the other three cutting wheel bodies 20 are driven wheels. Thus, in the two cutting wheel groups arranged in parallel, the four cutting wheel bodies 20 are arranged in a rectangular shape, wherein one cutting wheel body 20 is a driving wheel, and three cutting wheel bodies 20 are driven wheels.

[0055] Specifically, the three passive wheels are directly or indirectly connected to the active wheel through a cutting line or a rotating shaft, and keep rotating synchronously.

[0056] In some embodiments, see Figure 4 The squarer also includes a movable pressing member 50, which extends from top to bottom toward the silicon rod 10 and has at least one protruding pressing portion 51; the pressing portion 51 is used to press the edge material portion 13 and / or the recovery portion 14. In this way, the portion cut from the silicon rod 10 is pressed by the pressing portion 51 to prevent the edge material portion 13 or the recovery portion 14 from being skewed during cutting, thereby ensuring smooth cutting.

[0057] For details, see Figure 4 The part pressed by the pressing part 51 has the following three forms: the first one, the pressing part 51 is used to press the edge material part 13 and the recovery part 14 at the same time, so that the edge material part 13 and the recovery part 14 are not easy to be skewed when being cut, and the cut shape is highly regular, so this pressing method has the best effect; the second one, the pressing part 51 is only used to press the edge material part 13, because the edge material part 13 is pressed and the cutting shape is guaranteed, and the recovery part 14 is only used for recycling, the shape of the recovery part 14 is irregular, so it is acceptable to only fix the position of the edge material part 13, and the effect is inferior to the first one; the third one, the pressing part 51 is only used to press the recovery part 14, the edge material part 13 is located before the silicon square and the recovery part 14, which has a limiting effect on the edge material part 13, so this way of the pressing part 51 acting on the recovery part 14 is also acceptable, but the effect is the worst among the three.

[0058] In some embodiments, see Figure 4 The pressing member 50 is provided with two raised pressing parts 51, and an air-avoiding groove 52 is provided between the two pressing parts 51. The two pressing parts 51 are used to simultaneously press the edge material part 13 and the recovery part 14. In this way, the two pressing parts 51 are used to simultaneously press the edge material part 13 and the recovery part 14, thereby ensuring the stability during the cutting process, and the stabilization effect is good; the air-avoiding groove 52 is provided, and the air-avoiding groove 52 corresponds to the movement direction of the second cutting line 40, so as to reduce the influence of the pressing member 50 on the cutting process when it moves and presses the silicon rod 10.

[0059] For details, see Figure 4The outer periphery of the clamping member 50 is columnar, and the width of the air-avoiding groove 52 in the middle is 3mm-6mm, and the depth of the air-avoiding groove 52 is 10mm-15mm; the clamping member 50 is movable, and through the corresponding clamping member 50 driving structure, after the silicon rod 10 is cut or about to be cut, the driving structure drives the clamping member 50 to move to the top of the silicon rod 10 and press the edge material part 13 and the recovery part 14, and after the cutting is completed, the clamping member 50 is removed.

[0060] When using the square machine, see Figure 3 The cutting wheel body 20 is connected to the machine head through a positioning pin 60. The machine head is a lifting structure. The cutting wheel body 20 is moved vertically by the machine head to cut the silicon rod 10. Four clamping members 50 can be provided. The positions of the four clamping members 50 correspond to the four cutting wheel groups one by one and are used in combination. When cutting, first put the silicon rod 10 in place, and move the two cutting wheel groups arranged in parallel along the first horizontal direction close to the silicon rod 10. At this time, since the clamping piece 50 is provided with an air avoidance groove 52, the top of the silicon rod 10 can be fixed by the clamping piece 50 first, or the cutting wheel group can be used to cut down a distance first and then the clamping piece 50 can be used to clamp the silicon rod 10. Both methods are acceptable. After the silicon rod 10 is cut in the first direction, the cut edge material part 13 and the recovery part 14 are removed, and the two cutting wheel groups and the corresponding clamping piece 50 arranged in parallel in the first direction are removed, and then the silicon rod 10 is cut in the second direction. The cutting method in the second direction is carried out with reference to the first direction; finally, a silicon square, four edge material parts 13 and four recovery parts 14 are obtained.

[0061] The present application can simultaneously perform preliminary cutting on the plate portion 12 while obtaining the silicon square, thereby obtaining the edge material portion 13, reducing the number of special machines for cutting the arc surface of the plate portion 12 and reducing the purchase cost of equipment in the project link; after a breakthrough is achieved in matching the single cutting area of ​​the equipment with the steel wire tension and process parameters, the efficiency of silicon square cutting is guaranteed and the plate material can be cut without increasing the labor force, which is equivalent to reducing the labor force for cutting the plate material separately and reducing the production cost; one machine has multiple uses, and two models are combined into one, which reduces the floor space of the equipment, narrows the management scope, and the total power consumption of the equipment is also lower than the total power of the two special equipment added together; different edge cutting grooves 22 can be switched according to the thickness requirement of the required small block of plate material, that is, the spacing between the square cutting groove 21 and the edge cutting groove 22 is adjusted, so that small blocks of the same thickness or small blocks of different thicknesses can be obtained.

[0062] In one embodiment, when the squarer is used for cutting, the silicon rod 10 used is a regular cylindrical shape, and the four sides of the silicon rod 10 are cut along the axial direction of the silicon rod 10 to obtain a regular rectangular silicon square. The cross section of the silicon square perpendicular to the axial direction of the silicon rod can be a square or a rectangle. Specifically, the circular cross section of the silicon rod 10 in the radial direction can be the circumscribed circle of the square. The silicon square is in the shape of a rectangular block and is a completed structure obtained by the squarer of the present application, while the silicon square portion 11 cannot be equivalent to the silicon square. The silicon square portion 11 is obtained by cutting the silicon rod 10 along the axial direction by a cutting wheel group, so the radial outer wall of the silicon square portion 11 has at least one square side, and the radial outer wall of the silicon square portion 11 has at most four square sides; when the silicon square portion 11 has four square sides, the silicon square portion 11 is a silicon square.

[0063] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0064] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "axial", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A square opening machine, characterized in that: comprising at least one pair of cutting wheel assemblies, each pair of said cutting wheel assemblies comprising, Two axially parallel cutting wheel bodies (20), each of the cutting wheel bodies (20) having an annular and parallel square cutting groove (21) and an edge cutting groove (22), The first cutting wire (30) is wound around the cutting grooves (21) of the two cutting wheel bodies (20) at the same time. A second cutting line (40) is wound around the trimming grooves (22) of the two cutting wheel bodies (20) at the same time; Each pair of the cutting wheel groups is used to cut the cylindrical silicon rod (10) along the axial direction of the silicon rod, the first cutting line (30) is used to cut the silicon rod (10) into a silicon square portion (11) and a plate portion (12), and the second cutting line (40) is used to cut the plate portion (12) into an edge portion (13) and a recovery portion (14).

2. The square opening machine according to claim 1, characterized in that: The cutting wheel body (20) comprises one square cutting groove (21) and at least two edge cutting grooves (22), and the second cutting wire (40) is wound in one of the edge cutting grooves (22).

3. The square opening machine according to claim 2, characterized in that: The intervals between the plurality of trimming grooves (22) are equal; one axial end of the cutting wheel body (20) is provided with a trimming groove (22), and the other end is provided with a square cutting groove (21).

4. The square opening machine according to claim 2, characterized in that: The trimming grooves (22) are three in number, and the cutting wheel assembly comprises two cutting wheel bodies (20).

5. The square opening machine according to claim 1, characterized in that: The cross sections of the square cutting groove (21) and the edge cutting groove (22) are both U-shaped.

6. The square opening machine according to claim 1, characterized in that: It comprises two cutting wheel sets, wherein the axes of all the cutting wheel bodies (20) contained in the two cutting wheel sets are arranged in parallel, and the two cutting wheel sets are used to cut two opposite sides of the silicon rod (10) simultaneously.

7. The square opening machine according to claim 1, characterized in that: Comprising four cutting wheel assemblies, wherein: The axial directions of the cutting wheel bodies (20) included in the two cutting wheel assemblies are arranged parallel to a first direction. The axial directions of the cutting wheel bodies (20) included in the other two cutting wheel groups are arranged parallel to a second direction, and the first direction and the second direction are arranged perpendicularly.

8. The square opening machine according to claim 6 or 7, characterized in that: The two cutting wheel groups arranged in parallel rotate synchronously and comprise four cutting wheel bodies (20), wherein any one of the cutting wheel bodies (20) is connected to a driving member and serves as a driving wheel, and the remaining three cutting wheel bodies (20) are driven wheels.

9. The square opening machine according to claim 5, characterized in that: The square opening machine further comprises a movable pressing member (50), wherein the pressing member (50) has at least one protruding pressing portion (51) extending toward the silicon rod (10); The pressing portion (51) is used to press the edge material portion (13) and / or the recovery portion (14).

10. The square opening machine according to claim 9, characterized in that: The pressing member (50) is provided with two protruding pressing parts (51), a clearance groove (52) is provided between the two pressing parts (51), and the two pressing parts (51) are used to simultaneously press the edge material part (13) and the recovery part (14).

Images