Novel circular saw blade base body

Abstract

The invention discloses a novel circular saw blade base body. The novel circular saw blade base body comprises an outer ring used for welding a tool bit and an inner ring welded to the outer ring in a spot welding mode. The outer ring and the inner ring are coaxially arranged, the center of the outer ring is provided with an inner spigot, one end face of the inner spigot is provided with a triangular groove, the other end face of the inner spigot is a plane, and the inner ring is provided with a triangular flange; the inner ring is provided with an outer spigot; the outer spigot is matched with the inner spigot; the thickness of each of the outer ring and the inner ring is T, the depth of each triangular groove is T / 2, and the thickness of each triangular flange is T / 2; the triangular flange is mounted in the triangular groove; the vibration reduction device has the beneficial effects that the vibration energy is consumed through the interfaces of the inner ring and the outer ring on the path where the vibration is conducted inwards on the base body, and an effective vibration reduction method for damping the vibration through the two interfaces is achieved; the triangular structure of the seam allowance has a damping effect on vibration in the radial direction from outside to inside.

Description

Technical Field

[0001] The present application relates to the technical field of a sound-absorbing saw blade substrate, and more specifically, to a novel circular saw blade substrate. Background Art

[0002] Circular saw blade cutting is a common material processing method. The cutter head applies force to the cutting object to cut a through groove in the whole material for segmentation. Since the cutter head contacts the cutting object at a high linear speed, an impact force is generated between the two, which is inevitably accompanied by vibration and noise.

[0003] As workers' requirements for working environment are increasing, in order to reduce vibration and noise, silencers have gradually developed. Its mainstream structure is divided into two categories. One is that the base is divided into two layers in the thickness direction, and a damping layer of different materials is added between the two layers, and they are connected into a whole by spot welding, which is called a sandwich base; the other is to cut appropriate holes or slits on the plane of the base. The cut holes are called air holes, and the cut slits are called silencer slits.

[0004] The disadvantages of sandwich substrates (such as those disclosed in application numbers CN200820229338.4 and CN201420845927.0) are low substrate strength, high labor intensity for leveling, low production efficiency and high cost. The appearance of the substrate itself is a round thin sheet. Taking a commonly used substrate with a diameter of 350 mm as an example, the overall thickness of the substrate is generally 2.4-2.8 mm. The damping layer of the sandwich substrate is 0.1 mm, and the typical material is copper. The thickness of the single-layer substrate is 1.15-1.35 mm. Therefore, the deformation of quenching in the processing of the single-layer substrate is large, and repeated leveling is required, and the workload of leveling is large; the density of the spot welding of the two-layer substrate and the damping layer is large, and the distance between two adjacent welding points is generally 30-50 mm. Since the thickness of the single-layer substrate is only 1.15-1.35 mm, the rigidity is very low, and the deformation of spot welding is very serious, and a cumbersome spot welding process is required, and the most complicated is still multiple leveling.

[0005] The poor consistency of the thickness of the single-layer substrate also leads to insufficient local strength of the sandwich substrate. The leveling machine cannot be used for leveling after spot welding, otherwise the weld will crack. It can only be leveled manually and tempered multiple times. Due to the dense spot welding and severe local deformation, it is difficult to level to less than 0.10 mm. Finally, the two planes can only be ground to ensure flatness. The large number of welds and complex deformation lead to large thickness errors for each single-layer substrate, which leaves hidden dangers for the strength of the substrate.

[0006] The chemical composition of the solder joint formed by spot welding is unstable, so the strength of the solder joint also varies. During the spot welding process of the substrate, the damping layer will be liquefied due to the impact of large current, and will be broken down to form spatter. Some materials will form a molten pool with the substrate material to complete the metallurgical process. However, the proportion of the material forming the molten pool is not stable, so the strength of the solder joint is also unstable; In practical applications, the cracking ratio of the weld is the most important indicator to measure the quality of the sandwich matrix.

[0007] The sound-absorbing and vibration-reducing effect of the air hole matrix or the sound-absorbing seam matrix is ​​not obvious, and a higher level of design is required. The sound-absorbing and vibration-reducing effect of this type of matrix absorbs the vibration energy by changing the cross section on the propagation path of the vibration wave, but due to the diffraction effect of the vibration wave, the absorption effect on the vibration wave is poor, so the sound-absorbing and vibration-reducing effect is not obvious. At the same time, the position and structural design of the air hole and the sound-absorbing seam need to follow the air hole design specifications to ensure the strength of the matrix. Summary of the invention

[0008] The purpose of the present application is to solve the shortcomings existing in the prior art and provide a new circular saw blade substrate, which can reduce the manufacturing difficulty while silencing the substrate.

[0009] The technical solution of this application is: A novel circular saw blade substrate comprises an outer ring for welding a cutter head and an inner ring welded to the outer ring; the outer ring is coaxially arranged with the inner ring, an inner stop is arranged at the center of the outer ring, a triangular groove is arranged on one end face of the inner stop, the other end face of the inner stop is a plane, and a triangular flange is arranged on the inner ring; the triangular flange is matched with the triangular groove.

[0010] Furthermore, the inner ring is provided with an outer stop; the outer stop is matched with the inner stop.

[0011] Furthermore, the thickness of the outer ring and the inner ring are both T, the depth of the triangular groove is T / 2, and the thickness of the triangular flange is T / 2; the triangular flange is installed in the triangular groove.

[0012] Furthermore, the outer diameter of the outer ring is D, the outer diameter of the outer stop and the inner diameter of the inner stop are both D 2 , 2 / 3D≥D 2 ≥1 / 2D.

[0013] Furthermore, the circumferential arc length of the triangular base of the triangular groove is L 1 , 50㎜≥L 1 ≥25㎜; the vertex angle of the triangular groove is α, 60°≤α≤80°.

[0014] Furthermore, the top angle of the triangular groove is set to be a rounded corner R2, 0.5 mm ≤ R2 ≤ 2 mm; the top angle of the triangular flange (22) of the inner ring (2) is set to be a rounded corner R1, and the value range of R1 is 2-3 mm.

[0015] Further, when the side length of the triangular groove of the outer ring is less than or equal to 50 mm, a welding point is set at the corner of each triangle; Further, when the side length of the triangle of the triangular groove of the outer ring is greater than 50 mm, a welding point is set at the corner of each triangle, and a welding point is added at the midpoint of each side; Furthermore, the center of the solder joint on the corner of the triangle coincides with the center of the rounded corner, and the diameter of the solder joint is d 4 , 2㎜≤d 4 ≤5㎜.

[0016] The beneficial effects of this application are: The inner and outer ring structures of the present application can significantly reduce the vibration and noise during the saw blade cutting process, improve the operator's feel; greatly reduce the leveling workload when manufacturing the substrate; enhance the overall strength of the substrate; and reduce the risk of instability and deformation during the saw blade cutting process.

[0017] The vibration and noise of the saw blade are caused by the impact between the cutter head and the cutting object. The vibration is transmitted along the cutter head outside the saw blade to the base. The base transmits the vibration to the drive spindle through the flange. The vibration of the spindle is transmitted through the body of the drive device to the operating hand-held position of the body, and finally transmitted to the operator. The operator needs to hold the saw machine with force, which actually absorbs the energy of the vibration and makes the operator tired quickly.

[0018] The structural principle of the present application is that the energy of the vibration is consumed through the interface between the inner and outer substrates on the path of the vibration being transmitted inward on the substrate, and damping the vibration through the interface between the two objects is an effective vibration reduction method.

[0019] Another way to damp vibration is to damp it by changing the cross section along the propagation path of vibration. The triangular structure of the stopper is based on this principle. Along the radial direction, from the outside to the inside, the cross section of the triangular groove of the outer ring gradually increases, and the triangular flange of the inner ring base increases synchronously, both of which have a damping effect on vibration.

[0020] In the process of transmitting the vibration of the outer ring substrate to the inner ring substrate, the propagation effect of the welding points is greater, and the vibrations transmitted by the three welding points finally converge on the inner ring substrate. However, the phase angles of the vibrations transmitted by the three welding points at any point on the inner ring substrate are difficult to synchronize, and the vibration will be weakened after superposition.

[0021] Since the matrix is ​​divided into two parts, the stiffness of each part is significantly increased compared with the sandwich matrix that is axially divided into two parts. Whether it is single-body leveling or leveling after spot welding, the deformation is small, which eliminates the complex deformation caused by dense welding points and greatly reduces the workload of leveling.

[0022] Obviously, the substrate is originally a circular thin sheet structure, and the sandwich structure is adopted. The thickness of each substrate is reduced by more than half, and they are connected together by welding points, which has a significant weakening effect in terms of strength and rigidity. In the present application, the internal and external substrates have their own strengths and strengths strengthened, and the stress on the welding points has been greatly reduced. The stress on the welding points is mainly circumferential shear force, and this shear force is largely borne by the triangular groove of the outer ring substrate and the triangular flange of the inner ring substrate. The shear force borne by the welding points is very small, and it can be considered that the strength of the welding points has been greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 It is an exploded view of a part of the three-dimensional structure of this application; Figure 3 It is a partial three-dimensional structural schematic diagram of this application; Figure 4 for Figure 3 The enlarged view of point II; Figure 5 for Figure 1 The enlarged view of point Ⅰ; Figure 6 for Figure 1 Sectional view at AA; Figure 7 for Figure 1 Cross-sectional view at BB; Figure 8 Schematic diagram of the three-dimensional structure of the outer ring; Fig. 9 The schematic diagram of the structure of the outer ring is shown in the main view; Fig.10 for Fig. 9 The enlarged view of point III; Fig.11 for Fig. 9 Cross-sectional view at CC; Fig.12 for Fig.11 The enlarged view of point IV; Legend: 1-outer ring, 11-outer air hole, 12-triangular groove, 13-inner stop; 2-inner ring, 21-inner air hole, 22-triangular flange, 23-outer stop. DETAILED DESCRIPTION

[0024] This section will describe the specific embodiments of the present application in detail. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but they cannot be understood as limiting the scope of protection of the present application; Example 1

[0025] Reference Figure 1-12 As shown, A novel circular saw blade substrate comprises an outer ring 1 for welding a cutter head and an inner ring 2 welded to the outer ring 1; the outer ring 1 and the inner ring 2 are coaxially arranged, an inner stop 13 is provided at the center of the outer ring 1, one end face of the inner stop 13 is provided with a triangular groove 12, the other end face of the inner stop 13 is a plane, and the inner ring 2 is provided with a triangular flange 22; the triangular flange 22 is adapted to the triangular groove 12.

[0026] The inner ring 2 is provided with an outer stop 23 ; the outer stop 23 is matched with the inner stop 13 .

[0027] The detailed structure is that the matrix is ​​divided into an inner ring 2 and an outer ring 1, and the central axes of the two are overlapped and positioned; in the thickness direction, a single-sided circular inner stop 13 is dug out inside the outer ring 1, and a single-sided outer stop 23 is dug out outside the inner ring 1. The two stoppers are paired and combined into a complete matrix by spot welding.

[0028] The thickness of the outer ring 1 and the inner ring 2 are both T, the depth of the triangular groove 12 is T / 2, and the thickness of the triangular flange 22 is T / 2; the triangular flange 22 is installed in the triangular groove 12.

[0029] The outer diameter of the outer ring 1 is D, the outer diameter of the outer stop 23 and the inner diameter of the inner stop 13 are both D 2 , 2 / 3D≥D 2 ≥1 / 2D; The area of ​​the base body that is most prone to instability and deformation is the 1 / 2-2 / 3 circular ring range of the base body outer diameter D, because the ratio of circumferential compressive stress to circumferential stiffness in this circular ring area is the largest. This conclusion is theoretically valid and has been confirmed in practice. It is the basic theory guiding the design and production of the base body. Setting the positions of the air holes and slits in this area is the most common application of this conclusion. Setting the positions of the triangular groove 12 and the triangular flange 22 in this area can release the tangential compressive stress to the maximum extent and reduce the risk of instability and deformation of the saw blade.

[0030] like Fig.10As shown, the triangular groove 12 is an isosceles triangle, the base of the triangular groove 12 is an arc, and the circumferential arc length is L 1 , 50㎜≥L 1 ≥25㎜; the vertex angle of the triangular groove 12 is α (that is, the angle between the two sides), 60°≤α≤80°. 1 The setting of the α value is made by comprehensively considering the vibration damping effect and strength factors. Along the radial direction, the greater the change in the circumferential section, the better the vibration damping effect, but it is not conducive to the transmission of tangential force and circumferential positioning. Comprehensive consideration determines L 1 , α numerical range.

[0031] The top angle of the triangular groove 12 is a rounded angle R2, 0.5 mm ≤ R2 ≤ 2 mm; the sides of two adjacent triangular grooves 12 also have arc transitions; The vertex angle of the triangular flange (22) of the inner ring (2) is set to be a fillet R1, and the value range of R1 is 2-3mm; this can avoid interference between the two vertex angles; the numerical setting of R2 and R1 is to facilitate the mechanical processing and assembly of the inner ring 2 and the outer ring 1. The numerical setting of R2 facilitates the selection of a larger diameter milling cutter during the stop processing process, and also creates favorable conditions for heat treatment to prevent the fillet from being too small, which leads to stress concentration cracking during heat treatment.

[0032] The setting of R1>R2 is to ensure smooth assembly of the inner and outer ring substrates. The arc transition of the adjacent sides of the above triangle is to avoid stress concentration during cutting and heat treatment, ensure the strength of the substrate, and avoid the substrate from breaking at this point.

[0033] In order to ensure the firmness of welding, when the length of the side of the triangle of the triangular groove 12 of the outer ring 1 is less than or equal to 50 mm, a welding point is set at the corner of each triangle; When the side length of the triangular groove 12 of the outer ring 1 is greater than 50 mm, a welding point is set at the corner of each triangle, and a welding point is added at the midpoint of each side; in this way, the center of the welding point on the corner of the triangle coincides with the center of the rounded corner, and the diameter of the welding point is d 4 , 2㎜≤d 4 ≤5㎜.

[0034] The purpose of setting the welding spot is to minimize deformation while ensuring welding strength. Too dense welding spots can easily cause greater deformation. The setting of welding spot diameter is the result of many years of practical experience. The larger the welding spot diameter, the worse the quality stability of the welding spot. Domestic spot welding equipment has the best overall effect when the welding spot diameter is 3-5 mm.

[0035] The spot welding strength of the outer ring 1 and the inner ring 2 of the same material is far superior to that of the ordinary sandwich matrix; because the sandwich matrix has a copper interlayer, the welding strength is low.

[0036] Working principle, The vibration and noise of the saw blade are caused by the impact between the cutter head and the cutting object. The vibration is transmitted to the base along the cutter head on the outer edge of the saw blade. The base transmits the vibration to the drive spindle through the flange. The vibration of the spindle is transmitted through the body of the drive device to the operating hand-held position of the body, and finally to the operator. The operator needs to hold the saw machine with force, which actually absorbs the energy of the vibration and makes the operator tired quickly.

[0037] The structural principle of the present application is that the energy of the vibration is consumed through the interface between the inner and outer substrates on the path of the vibration being transmitted inward on the substrate, and damping the vibration through the interface between the two objects is an effective vibration reduction method.

[0038] Another way to damp vibration is to damp it by changing the cross section along the propagation path of vibration. The triangular structure of the stopper is based on this principle. Along the radial direction, from the outside to the inside, the cross section of the triangular groove 12 of the outer ring 1 gradually increases, and the triangular flange 22 of the base of the inner ring 2 increases synchronously, both of which have a damping effect on vibration; In the process of transmitting the vibration of the outer ring 1 to the inner ring 2 substrate, the propagation effect of the welding point is relatively large. The vibrations transmitted by the three welding points finally converge on the inner ring 2 substrate. However, the phase angles of the vibrations transmitted by the three welding points at any point on the inner ring 2 substrate are difficult to synchronize, and the vibration will be weakened after superposition.

[0039] Since the base is divided into inner and outer rings along the radial direction, the stiffness of each part is significantly increased compared with the sandwich base divided into two parts along the axial direction. Whether it is single-body leveling or leveling after spot welding, the deformation is small, which eliminates the complex deformation caused by dense welding points and greatly reduces the workload of leveling.

[0040] Obviously, the substrate is originally a circular thin sheet structure, and the sandwich structure is adopted. The thickness of each substrate is reduced by more than half, and they are connected together by welding points, which has a significant weakening effect in terms of strength and rigidity. In the present application, the internal and external substrates have their own strengths and strengths strengthened, and the stress on the welding points has been greatly reduced. The stress on the welding points is mainly circumferential shear force, and this shear force is largely borne by the triangular groove 12 of the outer ring 1 and the triangular flange 22 of the inner ring 2 substrate. The shear force borne by the welding points is very small, and it can be considered that the strength of the welding points has been greatly improved.

[0041] Example 2

[0042] The difference between this embodiment and embodiment 1 is that: like Figure 1 As shown, The inner ring 2 is provided with an inner air hole 21, the center of which is located at a diameter D 1 On the circle, D 1 Located inside the outer stop 23 of the inner ring 2, that is, D 1 Less than D 2 .

[0043] The inner air holes 21 can further reduce noise.

[0044] Example 3

[0045] The difference between this embodiment and embodiment 1 is that: like Figure 1 As shown, the outer ring 1 is provided with an outer air hole 11, and the center of the outer air hole 11 is located at a diameter D 3 On the circle, D 3 Greater than D 2 By providing the external air hole 11, the noise generated during cutting can be further reduced, achieving a noise reduction effect.

[0046] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A novel circular saw blade substrate, characterized in that: The invention comprises an outer ring (1) for welding a cutter head and an inner ring (2) spot-welded to the outer ring (1); the outer ring (1) and the inner ring (2) are coaxially arranged, the outer ring (1) is provided with an inner stopper (13), one end face of the inner stopper (13) is provided with a triangular groove (12), the other end face of the inner stopper (13) is a plane, and the inner ring (2) is provided with a triangular flange (22); the triangular flange (22) is adapted to fit the triangular groove (12).

2. A novel circular saw blade substrate according to claim 1, characterized in that: The inner ring (2) is provided with an outer stop (23); the outer stop (23) is matched with the inner stop (13).

3. A novel circular saw blade substrate according to claim 2, characterized in that: The thickness of the outer ring (1) and the inner ring (2) are both T, the depth of the triangular groove (12) is T / 2, and the thickness of the triangular flange (22) is T / 2; the triangular flange (22) is installed in the triangular groove (12).

4. A novel circular saw blade substrate according to claim 3, characterized in that: The outer diameter of the outer ring (1) is D, the outer diameter of the outer stop (23) and the inner diameter of the inner stop (13) are both D2, and 2 / 3D≥D2≥1 / 2D.

5. A novel circular saw blade substrate according to claim 4, characterized in that: The circumferential arc length of the triangular base of the triangular groove (12) is L1, 50㎜≥L1≥25㎜; the vertex angle of the triangular groove (12) is α, 60°≤α≤80°.

6. A novel circular saw blade substrate according to claim 5, characterized in that: The top angle of the triangular groove (12) is set to be a rounded corner R2, 0.5 mm ≤ R2 ≤ 2 mm; the top angle of the triangular flange (22) of the inner ring (2) is set to be a rounded corner R1, and the value range of R1 is 2-3 mm.

7. A novel circular saw blade substrate according to claim 6, characterized in that: When the side length of the triangular groove (12) of the outer ring (1) is less than or equal to 50 mm, a welding point is provided at the corner of each triangle; When the side length of the triangular groove (12) of the outer ring (1) is greater than 50 mm, a welding point is set at the corner of each triangle, and a welding point is added at the midpoint of each side; The center of the weld point on the corner of the triangle coincides with the center of the fillet, and the diameter of the weld point is d4, 2㎜≤d4≤5㎜.

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