A composite grinding wheel structure and a preparation method thereof

Abstract

The present invention belongs to the field of abrasive tools, and particularly relates to a composite grinding wheel structure and a preparation method thereof. The grinding wheel body includes a grinding wheel body, which is formed by alternately laminating abrasive layers and fiber cloth layers. A pulling connection structure is arranged between different layers of fiber cloth layers to reduce the delamination problem. At the same time, a method of integrally producing and integrally connecting and sewing multiple grinding wheels is proposed to reduce the production complexity of this connection structure.

Description

Technical Field

[0001] The present invention belongs to the field of abrasive tools, and particularly relates to a composite grinding wheel structure and a preparation method thereof. Background Art

[0002] The grinding wheel is a kind of mold. The abrasive is solidified into a specific shape through a binder. In the face of a working condition with greater strength, a fiber cloth is arranged inside the used grinding wheel to play the role of a supporting framework, so as to enhance toughness, reduce deformation, and make the grinding wheel more integral. For a relatively thick grinding wheel, multiple layers of fiber cloth will also be correspondingly arranged. For example, CN202122991650.5. However, whether it is a grinding wheel with a single layer or multiple layers of fiber cloth, in actual use, it will not only face the grinding working condition of bearing radial force, but also there is a lateral force at an angle between the radial and axial directions. After long-term use, there is a situation where the grinding wheel delaminates and breaks in the plane where the fiber cloth is located.

[0003] In the early stage, DE1502655C, a grinding wheel composed of one or more layers of synthetic resin binding abrasives and reinforcing layers, mentioned the above problems. Its solution was to arrange the fiber structure of the fiber cloth in a spiral manner to form a better pulling effect in the thickness direction of the grinding wheel and reduce the delamination problem. However, there is a lack of connection between the fiber cloths, and the achieved effect is not good.

[0004] To solve the above problems, a better solution is how to connect the fiber cloths and solve the delamination problem during the use of the grinding wheel through this connection.

[0005] The existing production method of grinding wheels is generally to carry out pouring and curing molding in a mold matching the grinding wheel. For example, CN202010783592.4, one mold corresponds to one grinding wheel. If a connection structure between the fiber cloths is to be set, it will lead to the complexity of the production process and the increase in cost. This technology will not have practical use significance. Therefore, it is also necessary to improve the production process of the grinding wheel. Summary of the Invention

[0006] To solve the delamination problem of the grinding wheel and the problem of complex production derived from this problem, the present invention provides a composite grinding wheel structure and a preparation method thereof.

[0007] The purpose of the present invention is achieved in the following way: a composite grinding wheel structure includes a grinding wheel body, and the grinding wheel body is formed by alternately laminating abrasive layers and fiber cloth layers, and a pulling connection structure is arranged between different layers of fiber cloth layers.

[0008] Further, the pulling connection structure refers to fiber filaments sewn between different layers of fiber cloth layers.

[0009] Further, the fiber cloth layer is composed of carbon fiber, and the fiber filament is a carbon fiber filament.

[0010] A preparation method for preparing the above-mentioned composite grinding wheel structure, the preparation method comprising the following steps:

[0011] S1. Prepare a mold with an open top and a needle-passing hole provided at the bottom of the mold;

[0012] S2. Prepare a mixture by mixing abrasives and a binder, prepare a fiber cloth, and alternately fill the mixture and the fiber cloth into the mold to form alternately stacked abrasive layers and fiber cloth layers;

[0013] S3. Pass the mold through the working area of a sewing device, and the sewing device sews and connects between the multi-layer fiber cloth layers through the fiber filaments threaded on the sewing needles to form a pulling connection structure;

[0014] S4. Set an upper mold on the top of the mold, and perform a heating process to cure the abrasive layer to form a plate;

[0015] S5. Take out the plate and cut it into the shape of a grinding wheel.

[0016] Further, the inscribed square of the outer circle of the grinding wheel to be processed, at least two juxtaposed inscribed squares are covered by the cross-section of the inner cavity of the mold.

[0017] Further, the needle-passing hole is a strip-shaped hole provided along the length direction of the mold, and a plurality of needle-passing holes are arranged in parallel and at intervals at the bottom of the mold, and the gap between adjacent needle-passing holes is less than 10 mm.

[0018] Further, the gap between the fibers constituting the fiber cloth is larger than the maximum diameter of the abrasives.

[0019] Further, the binder is a thermosetting resin.

[0020] Further, convex and concave structures are respectively provided at the bottom of the mold and the upper mold, so that the processed grinding wheel forms an umbrella-shaped structure.

[0021] Further, S6 is added after S5: Trim the outer surface of the grinding wheel to remove burrs.

[0022] Compared with the prior art, the present invention reduces the delamination problem by providing a pulling connection structure between different layers of fiber cloth layers, and at the same time proposes a method of integrally producing multiple grinding wheels and integrally connecting and sewing them, reducing the production complexity of this connection structure. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the mold;

[0024] Figure 2 is a schematic structural diagram of alternately stacked abrasive layers and fiber cloth layers in the mold;

[0025] Figure 3 One of the schematic structural diagrams in the sewing state;

[0026] Figure 4 Another of the schematic structural diagrams in the sewing state;

[0027] Figure 5 It is the schematic structural diagram of cutting the cured and formed sheet material.

[0028] Among them, grinding wheel 1, outer edge cutting line 11, inner hole cutting line 12, concave structure 13, abrasive layer 2, fiber cloth layer 3, mold 4, needle passing hole 41, fiber filament 5, sewing needle 6. Specific implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0030] In the present invention, unless otherwise clearly defined and limited, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0031] To solve the problem of delamination and fracture during the use of the grinding wheel, a composite grinding wheel structure is proposed, including the grinding wheel 1 body, and the grinding wheel 1 body is formed by alternately laminating the abrasive layer 2 and the fiber cloth layer 3, and a pulling connection structure is provided between different layers of the fiber cloth layer 3.

[0032] Furthermore, the pulling connection structure refers to the fiber filament 5 sewn between different layers of the fiber cloth layer 3.

[0033] Furthermore, the fiber cloth layer 3 is composed of carbon fiber, and the fiber filament 5 is a carbon fiber filament.

[0034] A preparation method for preparing the above composite grinding wheel structure, and the preparation method includes the following steps:

[0035] S1. As shown in the appendix Figure 1As shown in the figure, prepare the mold 4. The mold 4 has four side edges, a bottom plate at the bottom, and an open top for feeding. A through-hole 41 is provided at the bottom of the mold 4. The through-hole 41 is a through-hole for the sewing needle 6 to pass through. The through-hole 41 is a strip-shaped hole arranged along the length direction of the mold 4. The width of the strip-shaped hole should be at least greater than the diameter of the sewing needle 6 of the sewing equipment. A plurality of through-holes 41 are arranged in parallel and at intervals at the bottom of the mold 4. The distance between adjacent through-holes 41 is less than 10 mm, that is, the distance between adjacent fiber filaments 5 is less than 10 mm, preferably less than 2 mm.

[0036] The inscribed square of the outer circle of the grinding wheel 1 to be processed. At least two juxtaposed inscribed squares are covered by the cross-section of the inner cavity of the mold 4. That is to say, the size of the mold 4 should at least meet the requirement of simultaneously processing more than two grinding wheels 1. Since sewing operations are involved, if the traditional single-mold single-grinding wheel 1 method is used, it will be time-consuming and laborious. Therefore, a larger mold 4 is adopted to produce multiple grinding wheels simultaneously, and a large sewing machine in the prior art is used to sew and fix multiple rows of fiber filaments at the same time.

[0037] S2. As shown in the appendix Figure 2 As shown in the figure, prepare the abrasive and the binder to form a mixture, prepare the fiber cloth, and alternately fill the mixture and the fiber cloth into the mold 4 to form an alternately laminated abrasive layer 2 and fiber cloth layer 3. The binder is a thermosetting resin, so that curing does not occur before heating to prevent affecting subsequent sewing operations;

[0038] When filling the mixture of the abrasive and the binder, a hydraulic press can be used to assist in filling and pressing to increase the density of the abrasive layer 2. When filling, the mold 4 can be placed on a vibrating table to eliminate internal air holes through vibration and further increase the density;

[0039] The number of layers of the fiber cloth layer 3 and the abrasive layer 2 are determined according to actual usage requirements. Among them, the fiber cloth layer 3 is at least two layers;

[0040] Furthermore, the gap between the fibers constituting the fiber cloth is greater than the maximum diameter of the abrasive. The "gap between the fibers" can be the gap between fiber filaments, that is, a fiber cloth with a lower density, or the gap between fiber bundles, that is, a fiber mesh cloth. Preferably, the gap between the fibers constituting the fiber cloth is greater than 2-3 times the maximum diameter of the abrasive, so that the abrasive, the binder, and the fiber cloth can be better combined.

[0041] S3. As shown in the appendix Figures 3 - 4As shown in the figure, the mold 4 is passed through the working area of the sewing equipment. The sewing equipment is a large sewing machine of the prior art for sewing industrial quilts or rolling shutters, including multiple groups of sewing needles 6 arranged side by side. A fiber filament 5 is threaded through the sewing needles 6. The fiber filament 5 is preferably a continuous carbon fiber, ensuring sufficient length and toughness. The sewing equipment sews and connects the multiple layers of fiber cloth layers 3 through the fiber filament 5 threaded through the sewing needles 6 to form a pulling connection structure;

[0042] Specifically, the sewing needle 6 drives the fiber filament 5 to sequentially pass through the multiple layers of fiber cloth layers 3 and the abrasive layer 2, and passes through the needle hole 41 into the bobbin case below the sewing equipment. Through the bobbin case, the fiber filament 5 forms a loop and is fixed on the fiber cloth layer 3, so that the multiple layers of fiber cloth layers 3 are connected. The cooperation mode between the sewing needle 6 and the bobbin case belongs to the prior art, and only a brief description is given here;

[0043] Due to the irreplaceable bobbin case structure in the sewing equipment, the distance between the multiple rows of sewing needles 6 is relatively large. Therefore, for each complete sewing stroke, the mold 4 is translated by a distance x, where x is the distance between adjacent needle holes 41, so that the sewing needles 6 cooperate with the needle holes 41 to complete the dense multi-row sewing work.

[0044] S4. An upper mold is provided on the top of the mold 4. The bottom plate and the upper mold of the mold 4 can both be flat plates, which are used to process the cylindrical grinding wheel 1. However, in the prior art, there are also grinding wheels 1 with a fan-shaped structure, and one side is convex in the middle and the other side is concave in the middle. At this time, the bottom and the upper mold of the mold 4 are respectively provided with convex and concave structures corresponding to the above structures, so that the processed grinding wheel 1 forms an umbrella-shaped structure (or a bowl-shaped structure). For example, as shown in the appendix Figure 5 As shown in the figure, the concave structure 13 in the middle of the grinding wheel 1 can be formed by a convex block provided on the upper mold. Before curing, the mold is closed, and after curing, it is shaped;

[0045] Perform a heating process to cure the abrasive layer 2 to form a sheet material.

[0046] S5. Take out the sheet material. The sheet material preferably meets the size requirements for cutting out dozens of grinding wheels 1. As shown in the appendix Figure 5 As shown in the figure, along the hexagonal close-packed cutting method, cut along the outer edge cutting line 11 and the inner hole cutting line 12 in the figure to cut the sheet material into the shapes of the outer edges and inner holes of several grinding wheels 1. Preferably, it is cut by a water jet to complete the rough machining of the grinding wheel;

[0047] Furthermore, the side of the grinding wheel obtained by the above method is formed by cutting and is relatively rough. Due to the existence of the needle holes 41 on the back, there are also some convex ribs. Therefore, the outer surface of the grinding wheel 1 is trimmed by laser or electric discharge machining to remove burrs or convex structures.

[0048] The above are only the preferred embodiments of the present invention. It should be noted that for those skilled in the art, without departing from the overall concept of the present invention, several changes and improvements can still be made, and these should also be regarded as the protection scope of the present invention.

Claims

1. A preparation method of a composite grinding wheel structure, characterized in that: The preparation method includes the following steps: S1. Prepare a mold (4) with an open top and a needle-passing hole (41) provided at the bottom of the mold (4); the needle-passing hole (41) is a strip-shaped hole arranged along the length direction of the mold (4), and a plurality of needle-passing holes (41) are arranged in parallel and at intervals at the bottom of the mold (4), and the gap between adjacent needle-passing holes (41) is less than 10 mm; S2. Prepare a mixture of abrasive and binder, prepare a fiber cloth, and alternately fill the mixture and the fiber cloth into the mold (4) to form alternately stacked abrasive layers (2) and fiber cloth layers (3); S3. Pass the mold (4) through the working area of a sewing device, and the sewing device sews and connects the multi-layer fiber cloth layers (3) through the fiber filaments (5) threaded on the sewing needles (6) to form a tensile connection structure; S4. Set an upper mold on the top of the mold (4), and perform a heating process to cure the abrasive layer (2) to form a sheet material; S5. Take out the sheet material and cut it into the shape of a grinding wheel (1); The grinding wheel structure prepared by this method includes a grinding wheel (1) body. The grinding wheel (1) body is formed by alternately filling the abrasive layer (2) and the fiber cloth layer (3) into the mold (4) and stacking them. The abrasive layer (2) is formed by mixing abrasive and binder, and the binder is a thermosetting resin. A tensile connection structure is provided between different layers of fiber cloth layers (3); The tensile connection structure refers to the fiber filaments (5) sewn between different layers of fiber cloth layers (3); The gap between the fibers of the fiber cloth of the fiber cloth layer (3) is larger than the maximum diameter of the abrasive.

2. The preparation method of the composite grinding wheel structure according to claim 1, characterized in that: The outer circle of the processed grinding wheel (1) is inscribed with a square, and at least two juxtaposed inscribed squares are covered by the cross-section of the inner cavity of the mold (4).

3. The preparation method of the composite grinding wheel structure according to claim 1, characterized in that: Convex and concave structures are respectively provided at the bottom of the mold (4) and the upper mold, so that the processed grinding wheel (1) forms an umbrella-shaped structure.

4. The preparation method of the composite grinding wheel structure according to claim 1, characterized in that: After S5, add S6: Trim the outer surface of the grinding wheel (1) to remove burrs.

5. The preparation method of the composite grinding wheel structure according to claim 1, characterized in that: The fiber cloth layer (3) is composed of carbon fiber, and the fiber filament (5) is a carbon fiber filament.

Images