CN220075133U - Concrete slotting hard alloy saw blade - Google Patents

Abstract

The utility model discloses a concrete slotting hard alloy saw blade, which comprises a matrix, a cutter head group and a special-shaped nut, wherein the matrix is a hollow cylinder; the tool bit fixing part comprises a first bending part, a second bending part and a third straight tooth part; the cutter head group comprises a first special-shaped cutter head, a second special-shaped cutter head and a third special-shaped cutter head; the first special-shaped tool bit is welded with the first bending part; the second special-shaped tool bit is welded with the second bending part; the third special-shaped cutter head is welded with the third straight tooth part; the utility model has the beneficial effects that the welded special-shaped nut is connected with the main shaft of the driving equipment through threads, and the connection mode improves the connection strength; the design of the bending part and the straight tooth part of the matrix enlarges the cutting space of the cutter head and improves the sharpness of the slotting.

Description

Concrete slotting hard alloy saw blade

Technical Field

The utility model belongs to the technical field of hard alloy circular saw blades, and particularly relates to a concrete slotting hard alloy saw blade.

Background

For a long time, the grooving work on the existing concrete and brick walls is completed by cutting by a diamond saw blade or manually picking grooves;

the prior concrete and brick walls are grooved by a diamond saw blade, and two processing modes are generally adopted, namely, two parallel slots are cut by the diamond saw blade, and then building materials between the two slots are removed by a chisel; the other is to use a multi-blade saw to process, namely, a plurality of diamond saw blades are simultaneously installed on a rotating shaft, and a proper gap is adjusted between every two adjacent saw blades by using a gasket, so that the total thickness of the plurality of diamond saw blades is equivalent to the required groove width. Thus, grooves of a desired width and depth can be cut at a time.

The cutting efficiency of the diamond saw blade is significantly too low with respect to the cemented carbide saw blade because the cutting nature of the diamond saw blade is grinding and the cemented carbide saw blade is cutting.

The two parallel slots are cut, the chisel is removed, the two slots are difficult to be guaranteed to be parallel in actual operation, the depth is equal, and the width and the depth of the slot are required to be enlarged so as to ensure that the wire slot and the wire tube can be installed in place. The chisel removes the material between the two slits requiring heavy physical labor.

The multi-blade saw mode requires a diamond saw blade with a special structure and driving equipment, and is complex to install; meanwhile, because large chips are easy to clamp between the multiple-blade saw, the cutting work is forced to stop, and the multiple-blade saw is assembled again after the large chips are disassembled and removed, so that the cutting work is very complicated.

There is a strong need for a cemented carbide saw blade that can be grooved to solve the above problems.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a concrete slotting hard alloy saw blade, which can improve the cutting efficiency and has a relatively straight slotting.

In order to solve the problems, the utility model adopts the following technical scheme:

the concrete slotting hard alloy saw blade comprises a base body and at least one tool bit group welded with the outer edge of the base body; the special-shaped nut is fixedly connected with the central hole of the base body; the base body is a tool bit fixing part with a plurality of bulges on the outer circle; the number of the cutter head fixing parts is equal to that of the cutter head groups;

the substrate is provided with a front surface and a back surface;

the tool bit fixing part comprises a first bending part bending towards the front surface of the base body, a second bending part bending towards the back surface of the base body and a third straight tooth part overlapped with the central surface of the base body;

the cutter head group comprises a first special-shaped cutter head, a second special-shaped cutter head and a third special-shaped cutter head which are welded with the excircle of the matrix in sequence; the first special-shaped tool bit is welded with the first bending part; the second special-shaped tool bit is welded with the second bending part; and the third special-shaped cutter head is welded with the third straight tooth part.

Further, one end of the special-shaped nut is cylindrical, and the other end of the special-shaped nut is hexagonal; the diameter of the cylindrical end of the special-shaped nut is equal to the diameter of the central hole of the matrix;

the diameter of the hexagonal circumcircle of the special-shaped nut is larger than that of the central hole of the matrix; one cylindrical end of the special-shaped nut passes through the central hole of the matrix and then is welded with the matrix;

the hexagon head of the special-shaped nut is arranged on the front surface of the base body; the cylindrical head of the special-shaped nut is arranged on the back surface of the base body.

Further, an included angle between the first bending part and the central surface S of the width of the substrate is theta; the theta is more than or equal to 25 degrees and less than or equal to 35 degrees; the included angle between the second bending part and the central surface S of the width of the matrix is equal to the included angle between the first bending part and the central surface S of the width of the matrix in size and opposite in direction.

Further, the bending radius of the first bending part towards the outer side of the matrix is R1; r1 is more than or equal to [ 1-2 psi max/2 psi max ] B1; wherein B1 is the thickness of the matrix, and ψmax is the maximum reduction of area of the matrix.

Furthermore, a single-side V-shaped welding groove is formed in the center hole on the back surface of the substrate, the groove angle is 50 degrees, and the blunt edge of the groove is 2 millimeters.

Furthermore, the special-shaped nut adopts single-head threads, and the thread pitch is more than or equal to 2mm; the length of the thread is greater than 5 pitches; the thread rotation direction of the special-shaped nut is consistent with the rotation direction of the saw blade.

Further, the front angle alpha between the top surface of the first special-shaped cutter head and the bending teeth is 0-15 degrees, and the front angle oblique angle is 0 degrees; the back angle beta is smaller than 5 degrees, and the back angle bevel angle is smaller than 10 degrees and smaller than 15 degrees; the side angle is more than 3 degrees and less than 7.5 degrees; the side angle bevel angle b is less than 20 degrees and is more than 15 degrees; the first special-shaped tool bit and the second special-shaped tool bit are symmetrical about a central plane S.

Further, the third special-shaped cutter head is symmetrical about the central plane S, the cross section of the third special-shaped cutter head is triangular, and the vertex angle of the third special-shaped cutter head, which is firstly contacted with a cutting object, is mu, and 90 degrees is less than mu and less than 120 degrees.

Further, two grooves are formed in the rear cutter surface of the first special-shaped cutter head along the circumferential direction; the shape of the groove is V-shaped or semicircular; the diameter of the semicircular groove is 1/5 of the thickness of the cutter head; on the sections of the two grooves, the distance between the central lines of the two grooves is 2/5 of the thickness of the cutter head.

Compared with the prior art, the utility model has the remarkable beneficial effects that:

the utility model further expands the application range of the alloy saw blade, so that the alloy saw blade can cut inorganic nonmetallic materials such as concrete and the like, and has the obvious advantages of high efficiency, high speed, stability and reliability, especially for grooving of concrete and brick walls;

the grooving work of the concrete is changed from the grinding of the diamond saw blade to the cutting of the hard alloy saw blade, and the cutting efficiency is improved. The selection of the cutter head material ensures the impact toughness, hardness and wear resistance of the cutter head and reduces the damage tendency of the cutter head blade part;

the utility model adopts the welded special-shaped nut to be connected with the main shaft of the driving equipment through threads, and stably transmits motion and power. The problem that the contact area between the saw blade and the main shaft is small and enough friction force cannot be provided due to the size limitation of the saw blade (diameter) is solved;

and the screw thread parameter of the welding special-shaped nut is set, so that the screw thread can transmit larger torque without being damaged. The screwing direction of the threads is determined according to the rotation direction of the saw blade, so that the screwing direction of cutting resistance to the threads is ensured, and the falling-off phenomenon of the saw blade in cutting work is prevented;

the unilateral V-shaped welding groove on the back of the central hole of the matrix is arranged, so that the welding quality of the matrix sheet and the welding nut is ensured, and the welding seam is ensured to transmit larger torque;

the arrangement of the bending radius R1 at the inner sides of the two bending teeth of the matrix can prevent the bending teeth from cracking, ensure the bending quality and ensure the smooth completion of the bending process;

the cross section angle at the maximum outer diameter of each bending tooth is an obtuse angle of (95-110) °, so that the cutter head is ensured to contact a cutting object at an obtuse angle, and the strength of the cutter head is relatively improved. The cross section of the non-bending cutter head is in a triangle symmetrical to the middle plane, so that the sharpness of the cutter head is improved; the overlapping parts exist between the front curved teeth and the non-curved teeth and between the non-curved teeth and the back curved teeth in the axial direction, so that the integrity and the integrity of the opened groove are ensured, and the opened groove is prevented from leaving unresectable materials;

the setting of the cutter head angle is a result of balancing the sharpness and the service life of the cutter head, and is an optimal result obtained on the basis of a large number of tests;

cutting head slotting is an important way to improve sharpness, because slotting reduces the contact area between the cutting head and a cutting object, improves the pressure of the cutting head on the cutting object, and enables the cutting object to be cut more easily. This setting guarantees the intensity of tool bit under the prerequisite that improves sharpness.

Drawings

FIG. 1 is a schematic front view of the structure of the present utility model;

FIG. 2 is a schematic top view of the structure of the present utility model;

FIG. 3 is a schematic perspective view of the present utility model; the method comprises the steps of carrying out a first treatment on the surface of the

FIG. 4 is a cross-sectional view taken at A-A of FIG. 1;

FIG. 5 is a cross-sectional view taken at B-B of FIG. 1;

FIG. 6 is a cross-sectional view taken at C-C of FIG. 1;

FIG. 7 is a cross-sectional view taken at D-D of FIG. 1;

fig. 8 is a cross-sectional view at E-E of fig. 1.

In the drawings of which there are shown,

1-matrix, 2-special-shaped nut, 3-tool bit group, 11-first bending part, 12-second bending part, 13-third straight tooth part, 31-first special-shaped tool bit, 32-second special-shaped tool bit, 33-third special-shaped tool bit, 34-recess.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

Example 1

As shown in figures 1-8 of the drawings,

the concrete slotting hard alloy saw blade comprises a base body 1 and a tool bit group 3 welded with the outer edge of the base body 1, wherein the number of the tool bit group 3 is at least one; the special-shaped nut 2 is fixedly connected with the central hole of the base body 1; the base body 1 is a tool bit fixing part with a plurality of bulges on the outer circle; the number of the cutter head fixing parts is equal to that of the cutter head groups 3;

as shown in fig. 1, 4, 5, 7, 8, the base body 1 is provided with a front surface g and a rear surface h;

the tool bit fixing part comprises a first bending part 11 bending to the upper right of the center surface S of the base body 1 (front surface g), a second bending part 12 bending to the upper left of the center surface S of the base body 1 (back surface h), and a third straight tooth part 13 overlapped with the center surface S of the base body 1; gaps (commonly called water gaps) are reserved between the adjacent first bending parts 11, second bending parts 12 and third straight tooth parts 13 so that cut concrete flows out;

the cutter head group 3 comprises a first special-shaped cutter head 31, a second special-shaped cutter head 32 and a third special-shaped cutter head 33 which are welded with the excircle of the matrix 1 in sequence; the first special-shaped cutter head 31 is welded with the first bending part 11; the second special-shaped cutter head 32 is welded with the second bending part 12; the third special-shaped cutter head 33 is welded to the third straight tooth portion 13.

The first bending part 11 is bent toward the front surface g of the base 1; the bending angle is theta; the theta is more than or equal to 25 degrees and less than or equal to 35 degrees; if the angle is too large, the matrix 1 deforms greatly, internal cracks are easily caused, and the bending part breaks prematurely; if the angle is too small, the width of the cutting groove is not wide enough, so that the efficiency of the cutting groove is affected, for example, a groove with the width of 10mm needs to be cut, and the cutting can be performed twice;

the included angle between the second bending part 12 and the central surface S of the width of the base body 1 and the included angle between the first bending part 11 and the central surface S of the width of the base body 1 are also theta, and only the direction facing the back surface h of the base body 1 is the direction;

the first bending part 11 and the second bending part 12 have the same structure, are formed by stamping on the substrate 1 by using a die, and have high connection strength.

As shown in fig. 4 and 5, the first bending portion 11 (second bending portion 12) has a bending radius R1 toward the outside of the base 1; r1 is more than or equal to [ 1-2 psi max/2 psi max ] multiplied by B1; wherein B1 is the thickness of the matrix 1, and ψmax is the maximum area reduction rate of the matrix 1; the reasonable arrangement of the radius R1 can prevent cracks from occurring at the bending part of the bending part, ensure the bending quality and ensure the smooth completion of the bending process;

psi max is available from the materials handbook based on the material and thickness of the substrate 1.

One end of the special-shaped nut 2 is cylindrical, and the other end of the special-shaped nut 2 is hexagonal; the diameter of the cylindrical end of the special-shaped nut 2 is equal to the diameter of the central hole of the base body 1;

as shown in fig. 4, the diameter of the hexagonal circumcircle of the special-shaped nut 2 is larger than that of the central hole of the base body 1; one cylindrical end of the special-shaped nut 2 passes through the central hole of the base body 1 and then is welded with the base body 1;

the hexagonal head of the special-shaped nut 2 is arranged on the front surface of the base body 1; the cylindrical head of the special-shaped nut 2 is arranged on the back surface of the base body 1.

The special-shaped nut 2 adopts a single-head thread, and the thread pitch is more than or equal to 2mm; the length of the thread is greater than 5 pitches; the screw thread of the special-shaped nut 2 is in the same direction as the screw thread of the saw blade. The welding special-shaped nut 2 is connected with a main shaft of driving equipment through threads, so that motion and power are stably transmitted. The problem that the contact area of the saw blade and the main shaft is smaller and enough friction force cannot be provided due to the size limitation of the saw blade is solved.

As shown in fig. 4, the front angle α between the top surface of the first special-shaped cutter head 31 and the curved teeth is 0-15 °, and the front angle bevel is 0 °; the back angle beta is smaller than 5 degrees, and the back angle bevel angle is smaller than 10 degrees and smaller than 15 degrees; the side angle is more than 3 degrees and less than 7.5 degrees; the side angle bevel angle b is less than 20 degrees and is more than 15 degrees; the first shaped cutting head 31 and the second shaped cutting head 32 are symmetrical about a central plane S. The data are empirically obtained, and the sharpness and service life are designed, so that the user response is good. The second shaped cutting head 32 has the same structure as the first shaped cutting head 31.

As shown in fig. 5 and 8, the third special-shaped cutter head 33 is symmetrical about the central plane S, the cross section of the third special-shaped cutter head 33 is triangular, and the vertex angle of the third special-shaped cutter head 33 which is firstly contacted with a cutting object is μ, and 90 ° < μ < 120 °; the tool bit is the closed angle, cuts into the concrete easily, improves sharpness.

The section angle of the maximum outer diameter of each bending tooth is an obtuse angle of (95-110) DEG, so that the cutter head is ensured to contact a cutting object at the obtuse angle, and the strength of the cutter head is relatively improved; the cross section of the non-bending cutter head is in a triangle symmetrical to the middle plane, so that the sharpness of the cutter head is improved. The overlapping parts exist between the front curved teeth (the first special-shaped cutter head 31) and the non-curved teeth (the third special-shaped cutter head 33), and between the non-curved teeth (the third special-shaped cutter head 33) and the back curved teeth (the second special-shaped cutter head 32) in the axial direction, so that the integrity and the integrity of the opened groove are ensured, and the opened groove is prevented from being left with materials which are not cut off.

The manufacturing and using processes of the present utility model,

firstly, processing a substrate 1: the central hole of the base body 1, the first bending part 11, the second bending part 12 and the third straight tooth part 13 are directly punched and formed by a set of dies; then machining a groove on the central hole of the substrate 1 on a lathe; the inner sides of all the first bending parts 11 on the base body 1 are required to be on the same conical curved surface, so that concentricity during cutting is ensured; the inner side of the second bending part 12 is bent on the same conical curved surface on the back surface of the substrate 1;

the punched base body 1 is milled at the position where the cutter heads are required to be welded, then each cutter head is welded in sequence, during welding, one cutter head is welded firstly, then the opposite cutter heads are welded, so that the concentration of thermal stress is avoided, if the cutter heads are continuously welded, the base body 1 is deformed, and further subsequent annealing treatment is required, so that the mechanical strength of the base body 1 is influenced;

treating the groove, and finally welding the special-shaped nut 2 of the central hole; the welded saw blade matrix is marked with an arrow in the rotating direction omega, so that the situation that the installation directions are opposite and unstable cutting grooves are caused is avoided

When the saw blade is used, the rotation direction is noted for installation, the applied pressure is not too large, and hard objects such as steel bars are not required to be slowly fed so as to avoid tooth breakage.

When in cutting, the three tooth-type tool bits work cooperatively to cut the materials of the front part, the middle part and the back part of the saw blade in the axial direction. The cutting efficiency is improved, and repeated cutting of cutter teeth is avoided. The inner side surfaces of all the bent cutter heads are on one conical curved surface, so that the friction between the base body 1 and the material to be cut is reduced, the power loss and the temperature rise of the saw blade are reduced, and the cutting is lighter, faster and more stable.

The working condition of the alloy saw blade for concrete is low speed and heavy load, and the linear speed of the saw blade is not more than 10 m/s in order to ensure the service life of the saw blade. Limiting the linear speed of the saw blade is a necessary condition for guaranteeing the service life of the saw blade; has very important significance for the application of the saw blade.

Example 2

This embodiment is substantially the same in structure as embodiment 1,

the difference is that,

as shown in fig. 4, the central hole on the back of the substrate 1 is provided with a unilateral V-shaped welding groove, the angle of the groove, namely the included angle between the groove and the horizontal plane is 50 degrees, and the blunt edge of the groove is 2 millimeters; when the angle and the width of the groove are too small, the welding rod cannot go in, and the welding is not firm; if the angle and the width of the groove are too large, the contact part between the groove and the substrate 1 is too thin, so that the strength is affected;

the design can take the strength of the substrate 1 and the strength of the welding line into consideration, and the two modes are combined optimally.

Example 3

This embodiment is substantially the same in structure as embodiment 2,

the difference is that,

as shown in fig. 3, two grooves 34 are circumferentially provided on the rear face of the first special-shaped cutter head 31; the shape of the groove 34 is V-shaped or semicircular;

the diameter of the semicircular groove is 1/5 of the thickness of the cutter head; on the sections of the two grooves, the distance between the central lines of the two grooves is 2/5 of the thickness of the cutter head. The second special-shaped cutter head 32 has the same structure as the first special-shaped cutter head 31;

by providing the grooves 34, the sharpness of the cutting head can be increased.

At present, the technical scheme of the utility model has been subjected to pilot-scale experiments, namely small-scale experiments of products before large-scale mass production; after the pilot test is completed, the use investigation of the user is performed in a small range, and the investigation result shows that the user satisfaction is higher; now, the preparation of the formal production of the product for industrialization (including intellectual property risk early warning investigation) is started.

Claims (9)

1. The concrete slotting hard alloy saw blade comprises a base body (1) and a cutter head group (3) welded with the outer edge of the base body (1), wherein the number of the cutter head group (3) is at least one; the method is characterized in that: the special-shaped nut (2) is fixedly connected with the central hole of the base body (1); the base body (1) is a tool bit fixing part with a plurality of bulges on the outer circle; the number of the cutter head fixing parts is equal to that of the cutter head groups (3);

the substrate (1) is provided with a front surface and a back surface;

the tool bit fixing part comprises a first bending part (11) bending towards the front surface of the base body (1), a second bending part (12) bending towards the back surface of the base body (1) and a third straight tooth part overlapped with the central surface S of the base body (1);

the cutter head group (3) comprises a first special-shaped cutter head (31), a second special-shaped cutter head (32) and a third special-shaped cutter head (33) which are sequentially welded with the outer circle of the base body (1); the first special-shaped cutter head (31) is welded with the first bending part (11); the second special-shaped cutter head (32) is welded with the second bending part (12); the third special-shaped cutter head (33) is welded with the third straight tooth part (13).

2. A concrete grooving cemented carbide saw blade according to claim 1, wherein: one end of the special-shaped nut (2) is cylindrical, and the other end of the special-shaped nut (2) is hexagonal; the diameter of one cylindrical end of the special-shaped nut (2) is equal to the diameter of the central hole of the base body (1);

the diameter of the hexagonal circumcircle of the special-shaped nut (2) is larger than the diameter of the central hole of the base body (1); one cylindrical end of the special-shaped nut (2) passes through the central hole of the base body (1) and then is welded with the base body (1);

the hexagonal head of the special-shaped nut (2) is arranged on the front surface of the base body (1); the cylindrical head of the special-shaped nut (2) is arranged on the back surface of the base body (1).

3. A concrete slotting cemented carbide saw blade according to claim 2, characterized in that: the included angle between the first bending part (11) and the central surface S of the width of the matrix (1) is theta; the theta is more than or equal to 25 degrees and less than or equal to 35 degrees; the included angle between the second bending part (12) and the central surface S of the width of the base body (1) and the included angle between the first bending part (11) and the central surface S of the width of the base body (1) are equal in magnitude and opposite in direction.

4. A concrete slotting cemented carbide saw blade according to claim 2, characterized in that: the bending radius of the first bending part (11) towards the outer side of the substrate (1) is R1; r1 is more than or equal to [ (1-2 psi max)/2 psi max ] B1; wherein B1 is the thickness of the substrate (1), and ψmax is the maximum reduction of area of the substrate (1).

5. A concrete slotting cemented carbide saw blade according to claim 4, characterized in that: the central hole on the back of the matrix (1) is provided with a unilateral V-shaped welding groove, the groove angle is 50 degrees, and the blunt edge of the groove is 2 millimeters.

6. A concrete grooving cemented carbide saw blade according to claim 1, wherein: the special-shaped nut (2) adopts single-head threads, and the thread pitch is more than or equal to 2mm; the length of the thread is greater than 5 pitches; the screw thread of the special-shaped nut (2) is consistent with the screw direction of the saw blade.

7. A concrete slotting cemented carbide saw blade according to claim 6, characterized in that: the front angle alpha between the top surface of the first special-shaped cutter head (31) and the bending teeth is 0-15 degrees, and the front angle oblique angle is 0 degrees; the relief angle beta is less than 5 degrees; the back angle bevel angle is more than 10 degrees and less than 15 degrees; the side angle is more than 3 degrees and less than 7.5 degrees; the side angle bevel angle b is less than 20 degrees and is more than 15 degrees; the first special-shaped tool bit (31) and the second special-shaped tool bit (32) are symmetrical about a central plane S.

8. A concrete slotting cemented carbide saw blade according to claim 6, characterized in that: the third special-shaped cutter head (33) is symmetrical about the central plane S, the cross section of the third special-shaped cutter head (33) is triangular, and the vertex angle of the third special-shaped cutter head (33) which is firstly contacted with a cutting object is mu, and 90 degrees is less than mu and less than 120 degrees.

9. A concrete slotting cemented carbide saw blade according to claim 6, characterized in that: two grooves are formed in the rear cutter surface of the first special-shaped cutter head (31) along the circumferential direction; the shape of the groove is V-shaped or semicircular; the diameter of the semicircular groove is 1/5 of the thickness of the cutter head; on the sections of the two grooves, the distance between the central lines of the two grooves is 2/5 of the thickness of the cutter head.