Grinding jig for hard metal shear blade

Abstract

The utility model relates to powder metallurgy jig technical field, concretely relates to grinding jig for hard alloy scissors blade, including jig body, close piece and fixed part, the top surface of jig body is inwards recessed and forms at least one positioning groove for positioning scissors blade, first threaded hole is equipped with on the jig body corresponding fixed part, close piece is set up in the top of jig body and is used for with scissors blade adhesion, second threaded hole is equipped with on the close piece corresponding fixed part, fixed part is connected with the threaded connection of jig body through first threaded hole, fixed part is connected with the threaded connection of close piece through second threaded hole, fixed part can press to close piece to make close piece keep with the close state of scissors blade, close piece, fixed part and the positioning groove same number, the utility model can avoid appearing the condition that scissors blade appears slight jumping under the action of sand wheel extrusion pressure, guarantees the sharpness and life of scissors blade.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy fixture technology, specifically to a grinding fixture for cemented carbide scissor blades. Background Technology

[0002] In the overall manufacturing process of carbide scissor blades, the grinding process plays an indispensable and crucial role, directly determining the final product performance and quality level. Among these processes, the flatness of the scissor blade after grinding is a core indicator for evaluating the processing effectiveness. Flatness not only directly and significantly impacts the sharpness of the scissors during subsequent use but is also closely related to their overall lifespan. Whether the flatness meets the standards fundamentally determines whether the carbide scissors can meet practical application requirements.

[0003] Currently, in the field of grinding carbide shear blades, traditional grinding fixtures are commonly used. These fixtures have a relatively simple design; their core structure is typically a specially designed positioning groove. During actual processing, operators rely on this groove to fix the carbide shear blade, ensuring that it does not shift significantly during grinding. This provides the basic conditions for the grinding operation. Due to their simple structure and ease of operation, these fixtures are widely used in the industry.

[0004] However, with the increasing precision requirements for machining carbide shear blades, the inherent defects of traditional positioning slot grinding fixtures have become increasingly apparent. The most critical problem is that these fixtures can only position the shear blades, lacking effective clamping. In actual grinding, the shear blades are merely placed in the positioning slots without sufficient clamping force to maintain stability. This "positioning without clamping" design flaw makes it difficult to guarantee the stability of the shear blades during machining, creating potential problems for subsequent processing.

[0005] When using traditional jigs for grinding, and the feed rate of the grinding wheel reaches a certain level, the high-speed rotation of the grinding wheel exerts significant compressive force on the carbide shear blades. Because the jig cannot effectively clamp the blades, this compressive force causes slight vibration. This slight vibration directly results in an uneven surface on the ground blades, leading to a decrease in sharpness and accelerating wear during use, thus shortening their lifespan and impacting the product quality and market competitiveness of the carbide shears.

[0006] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0007] The purpose of this invention is to provide a grinding fixture for carbide shear blades.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A grinding fixture for carbide scissor blades, comprising a fixture body, a clamping component, and a fixing component;

[0010] The top surface of the fixture body is recessed inward to form at least one positioning groove for positioning the scissor blade; the fixture body is provided with a first threaded hole corresponding to the fixing member;

[0011] The fastening element is movably disposed on the top of the fixture body and is used to fit with the scissor blade; the fastening element has a second threaded hole corresponding to the fixing element;

[0012] The fixing member is threadedly connected to the fixture body through the first threaded hole, and the fixing member is threadedly connected to the fastening member through the second threaded hole; the fixing member can apply pressure to the fastening member so that the fastening member remains in close contact with the scissor blade;

[0013] The number of the fastening element, the fixing element, and the positioning groove are the same.

[0014] This application applies to fixing carbide scissor blades (hereinafter referred to as scissor blades), especially those with... Figure 1 The scissor blades are arranged at an angle between different parts, but are not limited to fixing only the scissor blades.

[0015] In some embodiments, the fixture body may include a square body, with a retaining element movably disposed on the square body (which may be detachably disposed). The top surface of the square body is raised, and a first threaded hole is disposed on the raised surface. The fixture body may be made of heat-treated mold steel P20 (hardness HRC45~55), and the retaining element and fixing element may also be made in this manner. This ensures the strength and hardness of the grinding fixture, prevents deformation or premature grinding during grinding, and extends the service life of the fixture.

[0016] The fixture body is equipped with a positioning groove, which can support the scissor blades and also perform preliminary positioning of the scissor blades, especially for scissor blades with similar shapes.

[0017] The fixing member is threadedly connected to the fixture body through the first threaded hole, and the fixing member can be movably positioned relative to the fixture body in the extension direction of the first threaded hole. When the fastening member is in the tight-fitting state, the fixing member applies pressure to the fastening member to keep the fastening member in tight contact with the scissor blade, so as to avoid the scissor blade from slightly jumping under the pressure of the grinding wheel, and to avoid unevenness of the scissor blade surface after grinding, thus ensuring the sharpness and service life of the scissor blade.

[0018] The fastener is threadedly connected to the fastener through the second threaded hole, which can restrict the movement of the fastener, such as preventing the fastener from tilting upwards due to the force transmitted by the scissor blades. This further ensures that the fastener can maintain a tight fit with the scissor blades, thereby further ensuring the sharpness and service life of the scissor blades.

[0019] Understandably, in the tight-fitting state, the fastening element applies a force to the scissor blades to keep them stable.

[0020] It is understandable that the fixing component is threadedly connected to the fastening component via the second threaded hole. Twisting the fixing component causes it to move the fastening component closer to the scissor blade. The relative positions of the fixing component, fastening component, fixture body, scissor blade, and the first and second threaded holes can be found in the attached diagram. Figure 1 The fastener can be an existing threaded structure, and there are no specific restrictions.

[0021] It should be noted that the grinding fixture in this application has the advantages of simple structure and low cost.

[0022] In a further technical solution, the fastening member has a mating surface for mating with the scissor blade, the mating surface including a first inclined surface, a connecting surface and a second inclined surface that are sequentially connected, and a first included angle between the extension line of the first inclined surface and the extension line of the second inclined surface;

[0023] Both the first inclined plane and the second inclined plane are planes;

[0024] When the fastener is in a tightly fitted state, the first inclined surface and the second inclined surface are respectively attached to the two surfaces of the scissor blade that are set at an angle.

[0025] See appendix Figure 1 The scissor blade has a first surface and a second surface (existing configuration) set at an angle (designated as the second angle). The first angle and the second angle are compatible, and both the first and second inclined surfaces are flat, allowing them to abut against the first and second surfaces respectively, ensuring a secure hold on the scissor blade. If the contact piece is a square, only the two edges at the intersection of the square's surfaces abut against the scissor blade, resulting in poor positioning and, understandably, reduced friction.

[0026] The connecting surface can be a plane, as can be seen in the following description of an isosceles trapezoid.

[0027] In a further technical solution, the positioning groove includes a first groove and a second groove that are connected to each other, and the extension direction of the first groove and the extension direction of the second groove are set at an angle (set as the third angle).

[0028] The third included angle matches the first and second included angles to better position the scissor blades initially.

[0029] It should be noted that if the positioning groove is a square groove (for example), the size of the square groove is larger than the attached... Figure 1 The dimensions of the central positioning groove make the attached Figure 1 The area between the first and second surfaces is a hollowed-out area and cannot be used to support the fastener, which is not conducive to positioning the scissor blades for smaller fasteners. If the fastener is too small, it cannot be initially placed next to the scissor blades and it is easy to fall into the square groove.

[0030] In a further technical solution, the fastening component includes a fastening portion, the cross-section of which is an isosceles trapezoid, and a portion of the surface of the fastening portion constitutes the bonding surface.

[0031] The first and second surfaces are generally symmetrically arranged (existing arrangement). The close-fitting part with an isosceles trapezoidal cross-section satisfies the setting requirements of the first and second inclined surfaces. This regular shape also makes the close-fitting part easy to manufacture, which can reduce the mass production cost of grinding fixtures.

[0032] In a further technical solution, the fastening component also includes a connecting portion, which is integrally formed with the fastening portion, and the connecting portion is provided with a second threaded hole.

[0033] As mentioned above, if the positioning groove is a square groove, the fastening part, which only includes the fitting part, is prone to falling into the square groove. By setting the connecting part, this problem can be avoided, allowing the fastening part to adapt to positioning grooves of more shapes.

[0034] A further technical solution is that the connecting part is a square body, and the surface of the connecting part near the fitting part has the same dimensions as the surface of the fitting part near the connecting part. In addition, the cross-section of the fitting part is an isosceles trapezoid, thereby making the fitting member form an attachment. Figure 3 The shape of the fitting is regular and easy to manufacture, which can reduce the processing difficulty of the grinding fixture and is also conducive to opening a second threaded hole with a larger opening size.

[0035] In a further technical solution, the opening of the second threaded hole is formed at the center of the side surface of the connecting part away from the mating part, which allows for the flexible opening of second threaded holes of various sizes, especially second threaded holes with larger opening sizes.

[0036] A further technical solution is that the fixture body is provided with a plurality of positioning grooves, and each positioning groove is evenly spaced and arranged side by side in the length direction of the fixture body, so as to simultaneously position multiple scissor blades and improve the processing efficiency of the scissor blades.

[0037] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0038] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0039] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0040] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing this case.

[0041] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0042] The working principle and advantages of this utility model are as follows:

[0043] The fixture body is equipped with a positioning groove, which can support the scissor blades and also perform preliminary positioning of the scissor blades, especially for scissor blades with similar shapes.

[0044] The fixing member is threadedly connected to the fixture body through the first threaded hole, and the fixing member can be movably positioned relative to the fixture body in the extension direction of the first threaded hole. When the fastening member is in the tight-fitting state, the fixing member applies pressure to the fastening member to keep the fastening member in tight contact with the scissor blade, so as to avoid the scissor blade from slightly jumping under the pressure of the grinding wheel, and to avoid unevenness of the scissor blade surface after grinding, thus ensuring the sharpness and service life of the scissor blade.

[0045] The fastener is threadedly connected to the fastener through the second threaded hole, which can restrict the movement of the fastener, such as preventing the fastener from tilting upwards due to the force transmitted by the scissor blades. This further ensures that the fastener can maintain a tight fit with the scissor blades, thereby further ensuring the sharpness and service life of the scissor blades. Attached Figure Description

[0046] Appendix Figure 1 This is a schematic diagram of the structure of the grinding fixture according to an embodiment of the present invention;

[0047] Appendix Figure 2 This is a schematic diagram of the structure of the fastening component according to an embodiment of the present utility model;

[0048] Appendix Figure 3 This is a top view of the fastening component according to an embodiment of the present utility model.

[0049] In the above figures: 1. Fixture body; 2. Fitting part; 21. Fitting part; 22. Connecting part; 3. Fixing part; 4. Positioning groove; 5. First threaded hole; 6. Second threaded hole; 7. Fitting surface; 71. First inclined surface; 72. Connecting surface; 73. Second inclined surface; 8. Scissor blade; 81. First surface; 82. Second surface. Detailed Implementation

[0050] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0051] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0052] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0053] See appendix Figure 1 -Appendix Figure 3 A grinding fixture for carbide scissor blades, comprising a fixture body 1, a fastening component 2, and a fixing component 3;

[0054] The top surface of the fixture body 1 is recessed inward to form at least one positioning groove 4 for positioning the scissor blade 8; the fixture body 1 is provided with a first threaded hole 5 corresponding to the fixing member 3;

[0055] The fastening element 2 is movably disposed on the top of the fixture body 1 and is used to fit with the scissor blade 8; the fastening element 2 is provided with a second threaded hole 6 corresponding to the fixing element 3;

[0056] The fixing member 3 is threadedly connected to the fixture body 1 through the first threaded hole 5, and the fixing member 3 is threadedly connected to the fastening member 2 through the second threaded hole 6; the fixing member 3 can apply pressure to the fastening member 2 so that the fastening member 2 remains in close contact with the scissor blade 8;

[0057] The number of the fastening member 2, the fixing member 3, and the positioning groove 4 are the same.

[0058] This embodiment is applicable to fixing the carbide scissor blade 8 (hereinafter referred to as scissor blade 8), especially with... Figure 1The scissor blades 8 are arranged at an angle between different parts, but are not limited to fixing only the scissor blades 8.

[0059] In some embodiments, the fixture body 1 may include a square body, with a retaining member 2 movably disposed on the square body (which may be detachably disposed). The top surface of the square body is raised, and a first threaded hole 5 is disposed on the raised surface. The fixture body 1 may be made of heat-treated mold steel P20 (hardness HRC45~55), and the retaining member 2 and the fixing member 3 may also be made of such steel. This ensures the strength and hardness of the grinding fixture, prevents deformation or premature grinding during grinding, and extends the service life of the fixture.

[0060] The fixture body 1 is provided with a positioning groove 4, which can support the scissor blades 8 and also perform preliminary positioning of the scissor blades 8, especially for scissor blades 8 with similar shapes.

[0061] The fixing member 3 is threadedly connected to the fixture body 1 through the first threaded hole 5. The fixing member 3 can be movably positioned relative to the fixture body 1 in the extension direction of the first threaded hole 5. When the fastening member 2 is in the tight-fitting state, the fixing member 3 applies pressure to the fastening member 2 to keep the fastening member 2 in tight contact with the scissor blade 8, so as to avoid the scissor blade 8 from slightly jumping under the pressure of the grinding wheel, and to avoid the problem of unevenness on the surface of the scissor blade 8 after grinding, thus ensuring the sharpness and service life of the scissor blade 8.

[0062] The fixing member 3 is threadedly connected to the fastening member 2 through the second threaded hole 6, which can restrict the movement of the fastening member 2, such as preventing the fastening member 2 from tilting upward due to the force transmitted by the scissor blade 8, and further ensuring that the fastening member 2 can maintain a tight fit with the scissor blade 8, thereby further ensuring the sharpness and service life of the scissor blade 8.

[0063] Understandably, in the tight-fitting state, the tight-fitting part 2 applies a force to the scissor blade 8 to keep it stable.

[0064] It is understandable that the fixing member 3 is threadedly connected to the fastening member 2 through the second threaded hole 6. By twisting the fixing member 3, the fastening member 2 is moved closer to the scissor blade 8. The relative positions of the fixing member 3, the fastening member 2, the fixture body 1, the scissor blade 8, the first threaded hole 5, and the second threaded hole 6 can be referred to the appendix. Figure 1 The fastener 3 can be an existing threaded structure, and there are no specific limitations.

[0065] It should be noted that the grinding fixture in this embodiment has the advantages of simple structure and low cost.

[0066] See appendix Figure 3In this embodiment, the fastening member 2 has a fitting surface 7 for fitting with the scissor blade 8. The fitting surface 7 includes a first inclined surface 71, a connecting surface 72 and a second inclined surface 73 connected in sequence. There is a first included angle (angle A in the figure) between the extension line of the first inclined surface 71 and the extension line of the second inclined surface 73.

[0067] Both the first inclined surface 71 and the second inclined surface 73 are planes;

[0068] When the fastener 2 is in a tight-fitting state, the first inclined surface 71 and the second inclined surface 73 are respectively attached to the two surfaces of the scissor blade 8 that are set at an angle.

[0069] See appendix Figure 1 The scissor blade 8 has a first surface 81 and a second surface 82 (current configuration) set at an angle (designated as the second angle). The first angle and the second angle are compatible, and both the first inclined surface 71 and the second inclined surface 73 are flat, allowing the first inclined surface 71 and the second inclined surface 73 to abut against the first surface 81 and the second surface 82 respectively, ensuring a secure fixation of the scissor blade 8. If the fastening member 2 is a square, only the two edges at the intersection of the square surfaces abut against the scissor blade 8, resulting in a poorer positioning effect and, understandably, reduced friction.

[0070] The connecting surface 72 can be a plane, as can be seen in the description of the isosceles trapezoid below.

[0071] In this embodiment, the positioning groove 4 includes a first groove and a second groove that are connected to each other, and the extension direction of the first groove is set at an angle (set as the third angle) with the extension direction of the second groove.

[0072] The third included angle matches the first and second included angles to better position the scissor blade 8 initially.

[0073] It should be noted that if the positioning groove 4 is a square groove (for example), the size of this square groove is larger than the attached... Figure 1 The dimensions of the central positioning groove 4 make the attached Figure 1 The area between the first surface 81 and the second surface 82 is a hollow area and cannot be used to support the fastener 2, which is not conducive to positioning the scissor blade 8 in the small fastener 2. If the fastener 2 is too small, it cannot be initially placed next to the scissor blade 8 and it is easy to fall into the square groove.

[0074] See appendix Figure 3 In this embodiment, the fastening member 2 includes a fastening portion 21, the cross-section of the fastening portion 21 is an isosceles trapezoid, and a portion of the surface of the fastening portion 21 constitutes the bonding surface 7.

[0075] The first surface 81 and the second surface 82 are generally symmetrically arranged (existing arrangement). The mating part 21 with an isosceles trapezoidal cross-section satisfies the arrangement requirements of the first inclined surface 71 and the second inclined surface 73. This regular shape also makes the mating part 2 easy to manufacture, which can reduce the mass production cost of grinding fixtures.

[0076] See appendix Figure 3 In this embodiment, the fastening member 2 further includes a connecting part 22, which is integrally formed with the fastening part 21, and the connecting part 22 is provided with the second threaded hole 6.

[0077] As mentioned above, if the positioning groove 4 is a square groove, the fastening member 2, which only includes the fastening part 21, is prone to falling into the square groove. By providing the connecting part 22, this problem can be avoided, allowing the fastening member 2 to adapt to positioning grooves 4 of more shapes.

[0078] See appendix Figure 3 In this embodiment, the connecting portion 22 is a square body. The surface of the connecting portion 22 near the fitting portion 21 has the same dimensions as the surface of the fitting portion 21 near the connecting portion 22. Furthermore, the cross-section of the fitting portion 21 is an isosceles trapezoid, thereby making the fitting member 2 form an attachment. Figure 3 The shape of the fitting 2 is regular and easy to manufacture, which can reduce the processing difficulty of the grinding fixture and is also conducive to opening a second threaded hole 6 with a larger opening size.

[0079] See appendix Figure 2 In this embodiment, the opening of the second threaded hole 6 is formed at the center of the side surface of the connecting part 22 away from the close-fitting part 21, and various sizes of second threaded holes 6 can be flexibly opened, especially second threaded holes 6 with larger opening sizes.

[0080] See appendix Figure 1 In this embodiment, the fixture body 1 is provided with a plurality of positioning grooves 4. Each positioning groove 4 is evenly spaced and arranged side by side in the length direction of the fixture body 1 to simultaneously position a plurality of scissor blades 8, thereby improving the processing efficiency of the scissor blades 8.

[0081] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A grinding fixture for carbide scissor blades, characterized in that: It includes the fixture body (1), the fastening part (2), and the fixing part (3); The top surface of the fixture body (1) is recessed inward to form at least one positioning groove (4) for positioning the scissor blade (8); the fixture body (1) is provided with a first threaded hole (5) corresponding to the fixing member (3). The fastening element (2) is movably disposed on the top of the fixture body (1) and is used to fit with the scissor blade (8); the fastening element (2) is provided with a second threaded hole (6) corresponding to the fixing element (3); The fixing member (3) is threadedly connected to the fixture body (1) through the first threaded hole (5), and the fixing member (3) is threadedly connected to the fastening member (2) through the second threaded hole (6); the fixing member (3) can apply pressure to the fastening member (2) so that the fastening member (2) remains in close contact with the scissor blade (8); The number of the fastening member (2), the fixing member (3), and the positioning groove (4) are the same.

2. The grinding fixture for carbide scissor blades according to claim 1, characterized in that: The fastening member (2) has a fitting surface (7) for fitting with the scissor blade (8), the fitting surface (7) includes a first inclined surface (71), a connecting surface (72) and a second inclined surface (73) connected in sequence, and there is a first included angle between the extension line of the first inclined surface (71) and the extension line of the second inclined surface (73). Both the first inclined plane (71) and the second inclined plane (73) are planes; When the fastener (2) is in a tight-fitting state, the first inclined surface (71) and the second inclined surface (73) are respectively attached to the two surfaces of the scissor blade (8) which are set at an angle.

3. The grinding fixture for carbide scissor blades according to claim 2, characterized in that: The positioning groove (4) includes a first groove and a second groove that are connected to each other, and the extension direction of the first groove and the extension direction of the second groove are set at an angle.

4. The grinding fixture for carbide scissor blades according to claim 3, characterized in that: The fastening member (2) includes a fastening part (21), the cross-section of which is an isosceles trapezoid, and a portion of the surface of the fastening part (21) constitutes the bonding surface (7).

5. The grinding fixture for carbide scissor blades according to claim 4, characterized in that: The fastening member (2) also includes a connecting part (22), which is integrally formed with the fastening part (21), and the connecting part (22) is provided with a second threaded hole (6).

6. The grinding fixture for carbide scissor blades according to claim 5, characterized in that: The connecting part (22) is a square body, and the side surface of the connecting part (22) near the close-fitting part (21) has the same size as the side surface of the close-fitting part (21) near the connecting part (22).

7. The grinding fixture for carbide scissor blades according to claim 6, characterized in that: The opening of the second threaded hole (6) is formed at the center of the side surface of the connecting part (22) away from the mating part (21).

8. The grinding fixture for carbide scissor blades according to any one of claims 1-7, characterized in that: The fixture body (1) is provided with a plurality of positioning grooves (4), and each positioning groove (4) is evenly spaced and arranged side by side in the length direction of the fixture body (1).

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