Hard alloy saw blade welding strength detection tool

Abstract

The utility model discloses a tool for detecting the welding strength of a hard alloy saw blade, which is used for detecting the welding strength of a tool bit of the hard alloy saw blade. Comprising a base, a saw blade positioning device arranged on the base and an alloy tool bit shearing device arranged on the base. A sliding groove is formed in the base, and the saw blade positioning device comprises a shaft seat, a saw blade seat connected with the shaft seat and a center shaft. A central hole of the hard alloy saw blade penetrates through the central shaft; the shearing device comprises a female die, a guide block and a pressure head; the pressing head is used for applying shearing pressure to the alloy tool bit, a notch is formed in the end, abutting against the alloy tool bit, of the guide block, the female die is provided with a pentagonal die cavity, and the pressing head is matched with the die cavity. The saw blade welding strength detection device has the beneficial effects that by arranging the positioning device and the shearing device, the welding strength can be detected after the saw blade is positioned.

Description

Technical Field

[0001] The utility model relates to the technical field of cemented carbide saw blade detection equipment, in particular to a welding strength detection tooling for cemented carbide saw blades. Background Technique

[0002] The cemented carbide circular saw blade is composed of a matrix located at the central position and several cutter heads welded to the outer edge of the matrix, and is in an overall circular thin sheet shape. The matrix is the supporting part of the cemented carbide circular saw blade, and is processed from high-quality carbon structural steel and alloy steel; the cutter head is also called the tool tip, and is processed from cemented carbide material;

[0003] Chip flutes and tooth seats are evenly distributed on the outer edge of the matrix, and the tooth seats are fixedly connected to the radial welding surface and circumferential welding surface of the tool tip through welding;

[0004] The welding strength of the tool tip refers to the shear strength of the weld seam. As stipulated in GB / T14388-2010: the shear strength of the weld seam shall not be lower than 120 Mpa.

[0005] Most cemented carbide saw blade manufacturers have drop test method and percussion test method for detecting the welding strength of the tool tip, and there are few professional welding strength detection devices. The so-called drop test method means that the saw blade is horizontally lifted to a certain height from the ground, and the saw blade is freely dropped onto the cement ground, and then it is checked whether there is any phenomenon of tool tip falling off. The so-called percussion test means that each tool tip is hammered one by one with a nylon hammer to check whether there is any phenomenon of tool tip falling off;

[0006] 1. Both the drop method and the hammering method rely on the experience of the operator for judgment, and the operation has a certain degree of randomness, and there are no specific data on the welding strength;

[0007] 2. Special strength detection devices are expensive, and the obtained strength data has a large error. Because the upper and lower indenter for applying shear stress are fixed on a slender rod, the stiffness is poor, and there is a large gap between the two indenters. The falling off of the tool tip is generated under the combined action of shear stress and bending tensile stress. The indenter of the special strength detection device has a straight cutting edge and cannot uniformly apply shear force to the circumferential weld seam of the weld seam. The whole weld seam is unevenly stressed, and the failure of the circumferential weld seam is driven by the separation of the radial weld seam. Content of the Utility Model

[0008] The technical problem to be solved by the utility model is to provide a welding strength detection tooling for cemented carbide saw blades, which utilizes the universal testing machine, a general testing device owned by most saw blade manufacturers, and through the tooling of the present application, accurately tests the welding strength of the tool tip and ensures the welding strength of the saw blade. The value of the shear force is obtained from the testing and display system of the universal testing machine.

[0009] To solve the above technical problems, the technical solution adopted by the present utility model is as follows:

[0010] A detection tooling for the welding strength of a cemented carbide saw blade, which is used for detecting the welding strength of the carbide saw blade tip; it includes a base, a saw blade positioning device provided on the base, and a carbide tip shearing device provided on the base.

[0011] A chute is provided on the base. The saw blade positioning device includes a shaft seat slidably connected to the chute, a saw blade seat slidably connected to the shaft seat, and a central shaft fixedly connected to the saw blade seat; the central hole of the cemented carbide saw blade is sleeved on the central shaft; the moving direction of the shaft seat in the chute is perpendicular to the moving direction of the saw blade seat in the shaft seat.

[0012] A pressed surface is provided on the shaft seat. A plurality of threaded holes are provided on the side wall of the chute. The shaft seat is positioned with the chute through a locking screw arranged in the threaded hole; the pressed surface abuts against the end of the locking screw.

[0013] A trapezoidal groove is provided on the shaft seat. The saw blade seat is slidably connected to the trapezoidal groove; a set screw is provided on the side wall of the trapezoidal groove. The saw blade seat is positioned with the shaft seat through the set screw.

[0014] The shearing device includes a female die fixedly connected to the base, a guiding block fixedly connected to the female die, and a pressing head slidably connected to the guiding block; the pressing head is used to apply a shearing pressure to the carbide tip, and the female die is used to support the substrate near the carbide tip of the cemented carbide saw blade.

[0015] The female die and the guiding block are positioned by a positioning pin and fixed by bolts.

[0016] A notch is provided at one end of the guiding block that abuts against the carbide tip. The depth of the notch is H1, 5mm ≤ H1 ≤ mm; a limiting plate is provided at the other end of the guiding block.

[0017] The female die is provided with a pentagonal die cavity. The pressing head is adapted to the die cavity. The top surface of the female die is flush with the top surface of the base. A convex platform is provided around the die cavity on the top surface of the female die; the height of the convex platform is t2, t2 = 1 / 2 × t - t1; where the width of the carbide tip is t and the thickness of the substrate is t1; the width of the convex platform is B, 1.5mm ≤ B ≤ 3mm.

[0018] Further, the female die is provided with a pentagonal die cavity. The die cavity includes a top edge, two side edges and two bottom edges. The angle between the two side edges and the center line is α, α = 10°; the length of the side edge L2 = L3 + 3; the length of the bottom edge is B2, B2 = B3 + 3; the side edge is perpendicular to the bottom edge; L3 is the length of the carbide tip; B3 is the thickness of the carbide tip.

[0019] The positive effects of the present utility model are as follows:

[0020] 1. By cooperating with a universal material testing machine through this application, the welding strength of cemented carbide circular saw blades can be accurately tested. The fixture has a wide range of applications and is basically applicable to all specifications and models of cemented carbide circular saw blades, providing a reliable guarantee for improving the quality of saw blades.

[0021] 2. The fixed connection between the base and the sliding groove improves the reliability of positioning. The settings of the sliding groove, the shaft seat, and the saw blade seat ensure the applicability and convenience for saw blades of different specifications and different rake angles.

[0022] 3. The setting of the die cavity at the edge of the concave die enables the saw blade to be horizontally placed during shearing, and the other cutting heads do not interfere with the upper surface of the concave die. The setting of the guiding block enables the pressure head to be reliably perpendicular to the substrate plane, while ensuring the shearing gap, effectively preventing the problem that the weld breaks under the combined action of shearing stress and bending normal stress, resulting in inaccurate test results.

[0023] The setting of the size of the concave die fully considers the actual size of the cutting head in production and the actual situation that the rake angle of the saw blade generally changes in two directions, larger and smaller, centered around 10°, thus making the fixture more convenient to use.

[0024] The die cavity of the concave die is symmetric about the center line, facilitating the detection of the welding strength of both sides of the saw blade and making the strength detection results more comprehensive.

[0025] 4. The setting of the pressure head and the limit plate prevents the fixture from shearing the substrate, thus avoiding the scrapping of the substrate. This is considered due to the generally small distance between adjacent cutting heads of the saw blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0027] Figure 2 is a left view of the structural schematic diagram of the present utility model;

[0028] Figure 3 is a front view of the structural schematic diagram of the present utility model;

[0029] Figure 4 is a top view of the structural schematic diagram of the present utility model;

[0030] Figure 5 is Figure 4 a sectional view taken along line A - A of

[0031] Figure 6 is Figure 4 a sectional view taken along line B - B of

[0032] Figure 7For Figure 4 Cross-sectional view at C-C of

[0033] Figure 8 Schematic perspective view of the female die

[0034] Figure 9 Top view of the female die

[0035] Figure 10 For Figure 9 Cross-sectional view at D-D of

[0036] Figure 11 Schematic perspective view of the pressure head

[0037] Figure 12 Top view of the pressure head

[0038] Figure 13 Schematic perspective view of the shaft seat 5

[0039] Figure 14 Partial enlarged view of the cemented carbide saw blade

[0040] Figure 15 Partial sectional view of the cemented carbide saw blade

[0041] In the figure:

[0042] 1 - Base, 2 - Threaded hole, 3 - Locking screw, 4 - Saw blade seat, 5 - Shaft seat, 51 - Tightened surface, 52 - Trapezoidal groove, 53 - Sliding part;

[0043] 6 - Washer, 7 - Central shaft, 8 - Guide block, 81 - Positioning pin, 82 - Bolt, 9 - Limit plate, 10 - Pressure head, 11 - Cemented carbide saw blade, 101 - Notch, 111 - Mold cavity, 112 - Boss, 113 - Slide groove, 114 - Female die. Specific implementation mode

[0044] Example 1

[0045] As Figures 1 to 15 shown

[0046] A cemented carbide saw blade welding strength detection tooling, installed on a universal material testing machine, used for detecting the welding strength of the cemented carbide saw blade cutter head; including a base 1, a saw blade positioning device provided on the base 1, and a cemented carbide cutter head shearing device provided on the base 1.

[0047] The universal material testing machine is an existing device. The universal material testing machine is also called the universal tensile testing machine or the electronic tensile testing machine. It has an independent servo loading system and a high-precision wide-frequency electro-hydraulic servo valve, ensuring high precision, high efficiency, low noise, and fast response of the system. The universal material testing machine uses a microcomputer to control a full-digital wide-frequency electro-hydraulic servo valve to drive a precision hydraulic cylinder. The microcomputer control system performs automatic control of test force, displacement, and deformation in multiple modes, and completes tensile, compression, and bending tests on specimens, meeting the requirements of the national standard GB / T228-2010 "Test Method for Tensile Testing of Metallic Materials at Room Temperature" and other standard requirements;

[0048] The saw blade positioning device is used for positioning the cemented carbide saw blade 11, and the alloy cutter head shearing device is used to apply a shearing force to the alloy cutter head on the saw blade. The magnitude of the shearing force is displayed and controlled on the universal material testing machine;

[0049] Such as Figure 1 As shown, a chute 113 is provided on the base 1; the chute 113 is long and strip-shaped;

[0050] The saw blade positioning device includes a shaft seat 5 slidably connected to the chute 113, a saw blade seat 4 slidably connected to the shaft seat 5, and a central shaft 7 fixedly connected to the saw blade seat 4; the central hole of the cemented carbide saw blade 11 is sleeved on the central shaft 7; the moving direction of the shaft seat 5 in the chute 113 is perpendicular to the moving direction of the saw blade seat 4 in the shaft seat 5.

[0051] The shaft seat 5 and the chute 113 are fixed by a locking screw 3.

[0052] A trapezoidal groove 52 is provided on the shaft seat 5, and the saw blade seat 4 is slidably connected to the trapezoidal groove 52; a set screw is provided on the side wall of the trapezoidal groove 52, and the saw blade seat 4 is positioned with the shaft seat 5 through the set screw.

[0053] A sliding part 52 is further provided on the shaft seat 5, and the sliding part 53 slides in the chute 113.

[0054] Through the cooperation of the trapezoidal groove 52 and the chute 113, the central shaft 7 can be fixed after relative movement with respect to the female die 114. After the cemented carbide saw blade 11 is installed on the central shaft 7, as long as it rotates by an angle around the central shaft 7, the strength of another alloy cutter head can be detected.

[0055] A washer 6 is provided on the central shaft 7 to fit the cemented carbide saw blade 11 with different inner holes;

[0056] The shearing device includes a female die 114 fixedly connected to the base 1, a guiding block 8 fixedly connected to the female die 114, and a punch 10 slidably connected to the guiding block 8. The punch 10 is used to apply a shearing pressure to the alloy cutting head, and the female die 114 is used to support the substrate near the alloy cutting head of the cemented carbide saw blade 11. The guiding block 8 is used for guiding the punch 10 when applying a shearing force to the alloy cutting head.

[0057] One end of the guiding block 8 is provided with a notch 101, and the depth of the notch 101 is H1, where 5mm ≤ H1 ≤ 10mm. A limiting plate 9 is provided at the other end of the guiding block 8. The notch 101 is provided to enable the alloy cutting head to be tested to come into contact with the punch 10 smoothly, that is, to make way for the saw blade.

[0058] The female die 114 is provided with a pentagonal die cavity 111. The punch 10 is adapted to the die cavity 111. The top surface of the female die 114 is flush with the top surface of the base 1. A convex platform 112 is provided around the die cavity 111 on the top surface of the female die 114. The height of the convex platform 112 is t2, and t2 = 1 / 2 × t - t1. Where the width of the cutting head is t and the thickness of the substrate is t1. The width of the convex platform 112 is B, where 1.5mm ≤ B ≤ 3mm.

[0059] As Figure 9 shown, the pentagonal die cavity 111 includes a top side, two side sides and two bottom sides. The angle between the two side sides and the center line is α1, and α1 = 10°. The length of the side side L2 = L3 + 3. The length of the bottom side is B2, and B2 = B3 + 3. The adjacent side side and the bottom side are perpendicular. L3 is the length of the alloy cutting head. B3 is the thickness of the alloy cutting head. The above dimensions are designed to match the dimensions of the alloy cutting head to avoid jamming.

[0060] The guiding block 8 is internally provided with an inner cavity having the same shape as the die cavity 111 of the female die 114 to facilitate the guiding of the punch 10.

[0061] The outer shape of the punch 10 is the same as the shape of the die cavity 111, and there is a gap between the punch 10 and the die cavity 111 to avoid jamming.

[0062] The working process of the present utility model

[0063] When testing the shearing force of the welding strength of the test cutting head, place the base 1 on the platform of the testing machine. First, estimate and adjust the distance between the central shaft 7 and the guiding block 8 according to the size of the saw blade. Then place the cemented carbide saw blade 11 on the central shaft 7 of the base 1, place one of the alloy cutting heads at the center of the die cavity 111, and then fix the shaft seat 5 and the saw blade seat 4.

[0064] Insert the indenter 10 into the guiding block 8, start the testing machine. The testing machine applies pressure to the indenter 10, and the indenter 10 applies a shearing force to the tool tip. The testing machine displays the given pressure. Meeting the national standard is considered qualified. Continuing to apply pressure can conduct a destructive test on the saw blade, and the true welding strength of the saw blade can be obtained, providing a technical basis for the improvement of the welding strength of the saw blade.

[0065] Embodiment 2

[0066] As Figure 2 shown, the difference between this embodiment and Embodiment 1 is that:

[0067] As shown in the figure, a pressed surface 51 is provided on the sliding part 53 of the shaft seat 5, and a number of threaded holes 2 are provided on the side wall of the sliding groove 113. The shaft seat 5 is positioned with the sliding groove 113 through a locking screw 3 arranged in the threaded hole 2; the pressed surface 51 abuts against the end of the locking screw 3.

[0068] By providing the pressed surface 51, when the end of the locking screw 3 abuts against the side of the shaft seat 5, it is avoided that the shaft seat 5 is scratched, resulting in poor sliding of the shaft seat 5 in the sliding groove 113.

[0069] Embodiment 3

[0070] The structure of this embodiment is basically the same as that of Embodiment 1,

[0071] The difference lies in that,

[0072] As Figures 6 - 7 shown, the die 114 and the guiding block 8 are positioned through a positioning pin 81, and the die 114 and the guiding block 8 are fixed through a bolt 82.

[0073] If the die 114 and the guiding block 8 are made into a whole, it will be very troublesome during manufacturing. Especially there is a part of the gap between the guiding block 8 and the die 114 for the tool tip to contact the indenter 10, and there is also a boss 112 on the die 114, which is simply impossible to process. Therefore, they are made separately, so that when the tool tip of this application is sheared, the boss 112 of the die 114 can support on the matrix around the tool tip, avoiding matrix deformation.

[0074] The embodiments described above are relatively detailed and specific, expressing the preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and characteristics of the present utility model. The purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly. However, it is not limited to the present utility model alone. The patent scope of the present utility model cannot be limited only by this embodiment. That is, any equivalent changes or modifications made in accordance with the spirit disclosed by the present utility model, for researchers or technicians in the field, within the structure of the present utility model, local improvements within the system and changes and transformations between subsystems are still within the patent scope of the present utility model.

Claims

1. A carbide saw blade welding strength detection tooling for detecting the welding strength of the carbide saw blade tip; characterized in that, It includes a base (1), a saw blade positioning device provided on the base (1), and a carbide cutting edge shearing device provided on the base (1). A chute (113) is provided on the base (1). The saw blade positioning device includes a shaft seat (5) slidably connected to the chute (113), a saw blade seat (4) slidably connected to the shaft seat (5), and a central shaft (7) fixedly connected to the saw blade seat (4); the central hole of the cemented carbide saw blade (11) is sleeved on the central shaft (7); the moving direction of the shaft seat (5) in the chute (113) is perpendicular to the moving direction of the saw blade seat (4) in the shaft seat (5). The shearing device includes a female die (114) fixedly connected to the base (1), a guiding block (8) fixedly connected to the female die (114), and a punch head (10) slidably connected to the guiding block (8); the punch head (10) is used to apply a shearing pressure to the carbide cutting edge, and the female die (114) is used to support the substrate near the carbide cutting edge of the cemented carbide saw blade (11).

2. The welding strength detection tooling for a cemented carbide saw blade according to claim 1, characterized in that A tightened surface is provided on the shaft seat (5), and a plurality of threaded holes are provided on the side wall of the chute (113). The shaft seat (5) is positioned with the chute (113) through a locking screw (3) arranged in the threaded hole; the tightened surface abuts against the end of the locking screw (3).

3. The welding strength detection tooling for a cemented carbide saw blade according to claim 2, wherein A trapezoidal groove is provided on the shaft seat (5), and the saw blade seat (4) is slidably connected to the trapezoidal groove; a set screw is provided on the side wall of the trapezoidal groove, and the saw blade seat (4) is positioned with the shaft seat (5) through the set screw.

4. A hard alloy saw blade welding strength detection tooling according to claim 1, characterized in that, The female die (114) and the guiding block (8) are positioned through a positioning pin (81), and the female die (114) and the guiding block (8) are fixed through a bolt (82).

5. The welding strength detection tooling for a cemented carbide saw blade according to claim 4, characterized in that, A notch (101) is provided at one end of the guiding block (8), and the notch (101) is used for the carbide cutting edge part to give way during the detection of the cemented carbide saw blade (11); the depth of the notch (101) is H1, 5mm ≤ H1 ≤ 10mm; a limiting plate (9) is provided at the other end of the guiding block (8).

6. The welding strength detection tooling for a cemented carbide saw blade according to claim 5, characterized in that The female die (114) is provided with a pentagonal die cavity (111), the punch head (10) is adapted to the die cavity (111), the top surface of the female die (114) is flush with the top surface of the base (1), and a convex platform (112) is provided around the die cavity (111) on the top surface of the female die (114); the height of the convex platform (112) is t2, t2 = (1 / 2)×(t - t1); where the width of the carbide cutting edge is t and the thickness of the substrate is t1; the width of the convex platform (112) is B, 1.5mm ≤ B ≤ 3mm.

7. A hard alloy saw blade welding strength detection tooling according to claim 6, characterized in that, The pentagonal die cavity (111) includes a top side, two side sides and two bottom sides. The angle between the two side sides and the center line is α1, α1 = 10°; the side length L2 = L3 + 3; L3 is the length of the carbide cutting edge; the bottom side length is B2, B2 = B3 + 3; the adjacent side side and the bottom side are perpendicular. B3 is the thickness of the carbide cutting edge.

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