JP2012510375A - Method for producing endless cutting wire for ingot cutting - Google Patents

Abstract

The present invention relates to a method of manufacturing an endless cutting wire for cutting an ingot, and more specifically, is a kind of cutting blade used for cutting a silicon ingot grown as a single crystal or a polycrystal, and is one without any break. The present invention relates to a method for manufacturing an endless cutting wire of a novel type that has two continuous rings and can cut an ingot while rotating at high speed on a pulley. To this end, the present invention prepares at least seven strand wires S of the same length prepared by twisting dozens of thin small-diameter wires into a twisted rod shape having a predetermined thickness, and then preparing the seven prepared wires. The strand wires S are bundled and twisted while twisting to form another wire rope R having a large diameter, but the twist start point and the opposite twist end point of the seven strand wires S are different from each other. The twist start points of the strand wires S are set to be different so as to start and end at the points, and the seven strand wires S having different start points are added to the other strand wires S that are twisted when the twist starts. Each of the seven strand wires twisted is put into the center of each other strand wire so as to be twisted while being tightly surrounded. Each twist end point of each is also put into the center of the other strand wire so as to be twisted while being tightly surrounded in the other strand wire being twisted, and there is no fragile portion (cut, knot), A step of manufacturing an endless cutting wire that is continuously connected as a whole, and a step of fixing cutting means 20 with carbide particles or diamond particles D to the entire outer peripheral surface of the manufactured endless cutting wire; A method for producing an endless cutting wire for cutting an ingot is provided.
[Selection] Figure 2

Description

  The present invention relates to a method of manufacturing an endless cutting wire for cutting an ingot, and more specifically, is a kind of cutting blade used for cutting a silicon ingot grown as a single crystal or a polycrystal, and is one without any break. The present invention relates to a method for manufacturing an endless cutting wire of a novel type that has two continuous rings and can cut an ingot while rotating at high speed on a pulley.

  Wafers used as the core parts of semiconductors and solar cells are obtained by cutting silicon ingots. At this time, it was usual in the past to use a thread-like band-shaped cutting blade as a cutting means. This has a problem that not only is the blade breakage rate high, the life is short and inferior in economic efficiency, but also inferior in cutting efficiency and productivity, and it is rarely used recently.

  Recently, as shown in FIG. 1, dozens of thin small-diameter wires (extremely thin metal cores of about 0.068 mm) are twisted into a twisted bar shape to form several larger-diameter strand wires S. The strand wire S having a predetermined length is further twisted to form a large-diameter rope-like wire, which has an endless annular structure in which the whole is continuously connected to one another without a break. Cutting means 20 (super-hard particles or diamond particles) is fixed to the surface of the wire, and it is endless for cutting an ingot that can be used as a highly efficient ingot cutting means when it is wound up tightly between pulleys that rotate at high speed. The demand for wire-shaped cutting wires has been rapidly increasing.

  The above-mentioned conventional endless cutting wire for ingot cutting is welded to the end of the wire after butting one end of the wire and the other end in order to endlessly connect the entire endlessly one piece. Or a method of crimping another connecting clip.

  However, the endless method using the welding or connecting clip is extremely difficult to work and requires a high level of skill, and in particular, for the ingot cutting in the winding state between the pulleys because the abutting portion is weak. There is an inconvenience that the wire easily breaks when performing high-speed rotation.

  As a result, the efficiency of wire cutting is greatly reduced, resulting in inefficiency of work due to frequent replacement work or repair work of the cutting wire, and a large cost loss. For this reason, the current situation is that a new and strong endless means for cutting wire that does not break even when the ingot is cut by rotating at high speed in a tight winding state between pulleys is desired.

  In addition, various methods for fixing cemented carbide beads particles to the cutting wire have been proposed in the past.However, there is a problem that the fixing force or brittleness is poor and it does not separate well when being in contact with the ingot material. Further, there is a problem that productivity and cutting quality are lowered due to inferior machinability.

  The present invention was made in order to solve the above-mentioned problems in the conventional endless cutting wire, and the purpose thereof is that there is no weak butt portion or knot as in the conventional case over the entire length of the cutting wire, In addition, the present invention is to provide a novel method for producing an endless cutting wire that can achieve a strong endless without breaks.

  In order to achieve the above object, the present invention prepares at least seven strand wires S of the same length manufactured by twisting dozens of thin small-diameter wires into a twisted rod shape having a predetermined thickness, The prepared seven or more strand wires S are bundled and twisted while twisting to form another wire rope R having a large diameter. The twist start point of the seven strand wires S and the twist on the opposite side are formed. The twist start points of the strand wires S are set to be different so that the end points start and end at different points, and the seven strand wires S having different start points are twisted when the twist starts. The other strand wires S are put in the central portions of the other strand wires so as to be twisted while being tightly surrounded by the other strand wires S. Each strand end point of the strand wire S is also inserted into the center portion of the other strand wire so that it is twisted while being tightly surrounded by the other strand wire being twisted, and the weak portion (cut, knot) is formed. A step of producing an endless cutting wire that is continuously connected as a whole, and a cutting means 20 with cemented carbide particles or diamond particles D is fixed to the entire outer peripheral surface of the manufactured endless cutting wire. And a step of manufacturing an endless cutting wire for cutting an ingot.

  Unlike the existing manufacturing method, the manufacturing method of an endless cutting wire for cutting an ingot according to the present invention is a fragile butt over a whole of a predetermined length of cutting wire that is continuously connected as a whole. There is no part, no cuts, no knots, etc., and it has a strong integral continuity, so it is absolutely unbroken even when rotated at high speed for cutting in a tight winding state between pulleys There is an advantage that is maintained. In addition, the preferable method of fixing the cemented carbide beads presented in the present application has a strong fixing property on the cutting wire, and the cutting is performed while the elastic force for increasing the cutting efficiency is appropriately exhibited. In addition to being effective in improving the cutting quality, the expected effect is such a great invention that it can greatly contribute to the prevention of damage such as dropping of the carbide bead particles.

It is a schematic illustration figure of a wire rope. It is a section illustration figure of a wire rope. It is an illustration figure which shows the addition time of a strand wire. It is an illustration figure which shows the twisted state of strand wires. It is a fractured sectional view of an endless cutting wire for cutting an ingot.

  In the present invention, after preparing at least seven strand wires S of the same length manufactured by twisting dozens of small-diameter wires into a twisted rod shape having a predetermined thickness, the prepared seven or more strand wires S are prepared. Are twisted together while twisting to form another wire rope R having a large diameter, but the twist start point and the opposite twist end point of the seven strand wires S start and end at different points, respectively. As described above, the twist start points of the strand wires S are set to be different from each other, and the seven strand wires S having different start points are firmly surrounded in the other strand wires S being twisted when the twist starts. Each strand end of each of the seven strand wires S that are twisted is put into the center of each other strand wire so that it is twisted while being twisted. Also, each strand wire is inserted into the center part of the other strand wire so as to be twisted while being tightly surrounded by the other strand wire being twisted, and there is no fragile portion (cuts, knots) at all. A step of manufacturing an endless cutting wire connected in a shape, and a step of fixing cutting means 20 with carbide particles or diamond particles D to the entire outer peripheral surface of the manufactured endless cutting wire. The present invention relates to a method for producing an endless cutting wire for cutting an ingot.

  Hereinafter, based on an accompanying drawing, a suitable embodiment of endless cutting wire 10 concerning the present invention is described concretely.

  First, the endless cutting wire 10 according to the present invention is formed by twisting dozens of small-diameter wires W (very thin metal cores of about 0.068 mm) into a twisted bar shape to form several larger-diameter strand wires S, The formed strand wire S having a predetermined length is further twisted to form a large-diameter rope-like wire R, but has an endless annular structure in which the whole is continuously connected to one another without a break. When the cutting means 20 (super hard particles or diamond particles) is fixed to the surface of the rope-like wire and is wound up tightly between pulleys rotating at high speed, it can be used as a highly efficient ingot cutting means. A method for producing an endless cutting wire 10 for cutting an ingot, wherein several tens of small-diameter wires W (a very thin metal core of about 0.068 mm) are twisted to a predetermined thickness After preparing at least seven strand wires S (0.5 mm or less) of the same length manufactured by twisting together, the above-prepared seven or more strand wires S are bundled and twisted while twisting to make a large diameter The other one wire rope R is formed, but the twist start point of the strand wire S is set so that the twist start point and the opposite twist end point of the seven strand wires S start and end at different points, respectively. The seven strand wires S, which are set differently and have different starting points, are twisted while being tightly surrounded by the other strand wires S being twisted when the twisting starts. Each strand is put into the center, and each strand end point of the seven twisted strand wires S is also twisted to other strands. There are no fragile parts such as cuts and knots, which are manufactured by putting them in the center part of other strand wires so that they are twisted while being tightly surrounded in the wire. An endless cutting wire.

  Further, the cutting means 20 fixed to the entire outer peripheral surface of the endless cutting wire manufactured in this way is applied to a molten metal fixing agent M (a molten liquid such as nickel or chromium) as shown in FIG. After the introduction of super hard particles or diamond particles D, a fusion method in which the particles are applied to the surface of the wire and firmly fixed, and the surface of the metal material of the cutting wire is made of another type of metal or alloy (nickel, chromium, etc. It is preferable to fix by a method selected from the group consisting of an electrodeposition method for fixing cemented carbide particles or diamond particles D while being coated and fixed by a thin film.

  The cutting means 20 formed by any one of the fusing method and the electrodeposition method is formed in a strip shape having a length of 3 to 10 mm, and is multistage at equal intervals over the entire length of the endless cutting wire. At this time, the cutting means 20 formed by the electrodeposition method is fixed to the tubular bead B that can be fitted into the endless wire, and then the bead B with the cutting means 20 is attached to the endless wire. It is preferable that the bead B fitted into the wire is firmly fixed to the wire by the brazing Z method after the production of the endless wire is completed.

  Further, an elastic resin P or a coil spring C having an excellent elastic force may be interposed between the cutting means 20 formed in a multi-step shape at predetermined equal intervals in the band shape. It goes without saying that the elastic efficiency may be further strengthened by mixing the resin P.

10: Endless cutting wire for cutting an ingot,
20: Cutting means,
B: Beads
C: Coil spring
D: Diamond particles (or super hard particles),
M: metal fixing agent,
P: resin,
R: wire rope,
S: Strand wire,
W: Small diameter wire

Claims (3)

Several tens of small-diameter wires are twisted into a twisted bar shape to form several larger-diameter strand wires (S), and the formed strand wire (S) having a predetermined length is further twisted to form a large-diameter rope. While forming a wire, it has an endless annular structure in which the whole is continuously connected to one another without any breaks, while the rope-like wire has a cutting means (20) (super hard particles or diamond particles) on the surface. Is a method for producing an endless cutting wire (10) for cutting a normal ingot that can be used as a highly efficient ingot cutting means when it is tightly wound between pulleys rotating at high speed,
After preparing at least 7 or more strand wires (S) (0.5 mm or less) of the same length produced by twisting dozens of small-diameter wires into a twisted rod shape having a predetermined thickness, the prepared 7 or more wires The other strand wire (S) is twisted and twisted to form another wire rope (R) having a large diameter.
The twist start points of the strand wires (S) are set differently so that the twist start points and the opposite twist end points of the seven strand wires (S) start and end at different points, respectively. Each of the seven different strand wires (S) is put into the center of the other strand wires so that when it begins to twist, it is twisted while being tightly surrounded by the other strand wires (S) being twisted And
The end points of the twisted seven strand wires (S) are also introduced into the central portions of the other strand wires so that they are twisted while being tightly surrounded by the other twisted strand wires. A step of producing an endless cutting wire having no fragile parts (cuts, knots) and continuous as a whole,
Fixing the cutting means (20) with cemented carbide particles or diamond particles (D) to the entire outer peripheral surface of the produced endless cutting wire;
A method for producing an endless cutting wire for cutting an ingot, comprising: The cutting wire cutting means (20)
A fusion method in which cemented carbide particles or diamond particles (D) are charged into the molten metal fixing agent (M), and then firmly applied to the surface of the wire to firmly fix it;
An electrodeposition method for fixing cemented carbide particles or diamond particles (D) while coating and fixing the surface of the metal material of the cutting wire with a thin film of another kind of metal or alloy;
The method for producing an endless cutting wire for cutting an ingot according to claim 1, wherein the fixing is performed by any method selected from the group consisting of: The cutting means (20) formed by any one of the fusing method and the electrodeposition method is formed in a strip shape having a length of 3 to 10 mm, and is equidistant over the entire length of the endless cutting wire. Multi-stage,
The cutting means formed by the electrodeposition method is fixed to the tubular beads (B) that can be fitted into the endless wire, and then fitted with the beads (B) with the cutting means (20) during the production of the endless wire, The endless cutting wire for cutting an ingot according to claim 2, wherein the fitted beads (B) are firmly fixed to the wire by brazing (Z) after completion of the production of the endless wire. Manufacturing method.

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