A cutting tool head and a wrench equipped therewith

Abstract

The present invention discloses a cutting tool head and a wrench equipped therewith; the cutting tool head comprises a cutting blade, a tail portion for connecting the tool head to a tool rod, and a neck portion between the cutting blade and the tail portion; a tool withdrawal groove is arranged on the neck portion; the wrench consists of an arc portion and a shank portion connected to the arc portion; the cutting tool head is equipped with the wrench of the present invention for use, and at this time, the cutting tool head has no restriction of the wrench groove on the tool head neck, thereby shortening the length of the tool neck, thereby reducing the adverse torque effect caused by the cutting force and reducing the damage to the tool; in addition, when the arc portion clamps the neck of the above-mentioned cutting tool head, it can be approximately regarded as the contact between cylindrical surfaces, and the friction between the wrench and the tool head will drive the tool head to rotate together, thereby completing the loading and unloading of the tool head, and since it is surface-to-surface contact, the contact is more stable, the service life of the wrench is extended, and the probability of damage to the tool head is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of rotary cutting tools and wrenches, and in particular to a cutting tool head and a wrench equipped therewith. Background Art

[0002] Rotary cutting tools can be divided into two parts: the cutter head and the tool bar, which are firmly connected by threaded connection. In order to ensure that the wrench does not become unstable, the wrench needs to have a certain thickness, so the wrench slot on the cutter head also needs to have a certain width and be greater than or equal to the wrench width. This width of the wrench slot leads to an increase in the length of the cutter head neck. When the cutter head is cutting, the cutting edge of the cutter head will be subjected to cutting force, which will apply a torque to the cutter head with the contact point between the cutter head and the handle as the fulcrum. This torque tends to cause the cutter head to tilt, which is not conducive to cutting, and requires a firm connection between the cutter head and the tool bar to resist. The longer the cutter head is, the greater the torque the cutter head is subjected to, and the higher the requirement for the firm connection between the cutter head and the tool bar. When the cutter head is long enough, the torque will destroy the connection between the cutter head and the tool bar, causing damage to the tool. The increase in the neck length indirectly increases the length of the cutter head, which is not good for the tool. Therefore, for the tool, the shorter the neck length, the better.

[0003] On the other hand, due to the existence of manufacturing tolerances, the width of the spanner groove on the cutting head needs to be greater than the width of the spanner. Therefore, when the spanner is working, the spanner and the spanner groove on the cutting head are in contact with two lines in theory. Since the cutter head is often made of harder materials such as cemented carbide, and the spanner is a relatively soft material (such as steel), the pressure of the two lines of contact between the spanner and the spanner groove on the cutting head is extremely large, which will form a depression on the softer spanner, and the spanner will fail when it is used too much. In practice, since the axis of the spanner cannot be perpendicular to the axis of the cutter head when the spanner is working, the pressure on the contact line between the spanner and the spanner groove on the cutting head will be inconsistent, and it will be greater than other points at a certain point, and this point is often more likely to be depressed first. The depression at this point makes the wrench more likely to be skewed in subsequent use, thereby exacerbating the premature damage of the wrench; secondly, the cutting edge of the cutting head is generally produced by grinding technology. In production, due to the needs of the process, a part of the back groove is required behind the cutting edge. In some cutter head designs, the influence of cutter head length on cutter head torque is obviously taken into consideration, and the cutter head length is minimized as much as possible. Therefore, inevitably, the back cutter groove interferes with or destroys a portion of the wrench groove on the cutter head. The incomplete wrench groove will obviously cause instability when the wrench is used, which may cause the wrench to be skewed and thus damage the cutting edge, and also cause the wrench to fail quickly.

[0004] The invention patent with publication number CN107030324A discloses a cutting tool, including a clamping component and a cutting component that can be installed on the clamping component, the clamping component includes a clamping handle and a clamping head, the cutting component includes a cutting head and a cutting tail, a clamping protrusion is provided on the end face of the cutting tail, and an external thread is provided on the clamping protrusion; the tool can be divided into a cutter head and a tool rod, and the two parts are firmly combined by a threaded connection. The neck of the cutter head is designed with a wrench groove as the action point of the wrench. The cutting tool is used with a matching conventional wrench. The width of the wrench groove on the cutter head is greater than or equal to the wrench width, resulting in an increase in the length of the cutter head neck. The greater the torque applied to the cutter head, the more this torque destroys the combination of the cutter head and the tool rod, causing damage to the tool. Summary of the invention

[0005] In view of the above-mentioned deficiencies of the prior art, the object of the present invention is to provide a cutting tool head and a wrench equipped therewith. The cutting tool head has a shorter head, thereby reducing the torque received by the tail. At the same time, the wrench is easy to use and has a long service life.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A cutting tool head comprises a cutting blade, a tail for connecting the tool head to a tool bar, and a neck between the cutting blade and the tail; the cutting blade is the working part of the tool head, and is composed of a plurality of cutting edges and a chip groove between the cutting edges; the tool head is tightly connected to the tool bar through a threaded structure at the tail; the neck is cylindrical, and has one or more tool withdrawal grooves formed when processing the cutting blade.

[0008] Furthermore, the diameter of the neck portion is smaller than the diameter of the blade portion.

[0009] Furthermore, the cutting edge of the cutter head is formed by grinding with a grinding wheel. During grinding, the grinding length of the grinding wheel is greater than the length of the cutting edge, so it will interfere with the neck and leave a tool-retracting groove structure on the neck.

[0010] Furthermore, the surface where the cutter head and the cutter rod are firmly connected is a bonding surface.

[0011] Furthermore, when viewed from the tail portion to the blade portion, the joint surface is a complete circle to ensure accurate connection between the cutter head and the cutter rod.

[0012] Furthermore, in order to ensure that the tool relief groove does not interfere with the joint surface, there is a certain distance between the tool relief groove and the joint surface in the axial direction of the cutter head, and the distance is generally 1 to 2 mm.

[0013] A wrench is used to disassemble the above-mentioned cutting bit, and the wrench consists of a wrench component 1 and a wrench component 2 with symmetrical structural structures; the wrench component 1 and the wrench component 2 include an arc portion connected by a cylindrical pin, and a handle portion connected to the arc portion; the arc portion of the wrench is provided with a groove with a notch, and the wrench drives the arc portion to rotate relative to each other with the cylindrical pin as the axis by clamping the handle portion. When the arc portion of the wrench is distributed at a large angle around the pin, the wrench is moved to the cutting bit, and then the handle portions of the wrench component 1 and the wrench component 2 are clamped so that the arc portion of the wrench clamps the neck of the bit, and the handle portion of the wrench is continuously clamped, causing the wrench to be slightly deformed, specifically: the notch on the groove gradually narrows, and the diameter of the clamping part of the arc portion of the wrench gradually decreases until the neck of the bit is tightly wrapped. When the arc portion of the wrench clamps the neck of the above-mentioned cutting bit, it can be approximately regarded as the contact between cylindrical surfaces. At this time, turn the wrench, and the friction between the wrench and the cutter head will drive the cutter head to rotate together, thereby completing the loading and unloading of the cutter head.

[0014] Furthermore, when the handles connected to the arc portion on the wrench component 1 and the wrench component 2 are basically parallel, the arc portion is a hollow cylinder with a diameter slightly larger than the diameter of the cutter head neck, which facilitates the placement of the cutter head neck into the arc portion of the wrench during loading and unloading.

[0015] Furthermore, the arc portion of the wrench is provided with grooves with notches distributed radially with the center of the arc portion as the center.

[0016] Furthermore, the notch on the groove gradually narrows or widens as the handle of the wrench is tightened or loosened.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The cutting tool head provided by the present invention comprises a cutting edge, a tail for connecting the tool head to a tool rod, and a neck between the cutting edge and the tail; the tool head is tightly connected to the tool rod through a threaded structure at the tail; the neck is cylindrical and has only one or more tool withdrawal grooves formed when processing the cutting edge; the cutting tool head is used together with the wrench of the present invention. At this time, the cutting tool head has no restriction of the wrench groove on the tool head on its tool head neck. When the tool withdrawal groove does not interfere with the contact surface between the tool head and the tool rod, the length of the tool neck is shortened as much as possible, thereby reducing the adverse torque effect caused by the cutting force and reducing damage to the tool.

[0019] Secondly, the wrench is used to load and unload the above-mentioned cutting bit. When the arc portion of the wrench clamps the neck of the above-mentioned cutting bit, it can be approximately regarded as the contact between cylindrical surfaces. The friction between the wrench and the bit will drive the bit to rotate together, thereby completing the loading and unloading of the bit. Since it is surface-to-surface contact, the contact is more stable, reducing the occurrence of accidents, extending the life of the wrench, and greatly reducing the chance of bit damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution in the embodiment of the present invention, the following will describe the embodiment or the prior art.

[0021] The accompanying drawings required for the description are briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0022] Figure 1 is a schematic diagram of the structure of a cutting head;

[0023] Figure 2 It is a schematic diagram of the cross section of the neck of the cutter head;

[0024] Figure 3 Schematic diagram of a wrench.

[0025] Among them, the reference numerals in the figure are: 20. blade; 21. back cutter groove; 30. neck; 40. tail; 35. joint surface; 50. wrench component one; 51. wrench component two; 52. notch on the groove; 53: arc portion; 60. handle; K. cylindrical pin; D2. diameter of the blade; D3. diameter of the neck; D5. diameter of the arc portion. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Example 1

[0028] like Figure 1~2A cutting tool head is shown, which includes a cutting edge 20 for cutting, a tail 40 for connecting the tool head to a tool rod, and a neck 30 between the cutting edge 20 and the tail 40; the cutting edge 20 is the working part of the tool head, and is composed of a plurality of cutting edges and a chip groove between the cutting edges; the tool head and the tool rod are tightly connected through the threaded structure of the tail 40, and the cutting tool head can be easily disassembled through this threaded structure; the neck 30 is cylindrical, and has one or more tool retreat grooves 21 formed when processing the cutting edge, and the diameter D3 of the neck is smaller than the diameter D2 of the cutting edge.

[0029] The cutting edge on the blade of the above-mentioned cutter head is formed by grinding with a grinding wheel. During grinding, the grinding length of the grinding wheel is greater than the length of the cutting edge, so it will interfere with the neck 30 and leave a structure of a back cutter groove 21 on the neck 30 .

[0030] Furthermore, the surface where the cutter head and the cutter rod are firmly connected is a joint surface 35. When viewed from the tail portion 40 to the blade portion 20, the joint surface 35 is a complete circle to ensure accurate connection between the cutter head and the cutter rod.

[0031] Furthermore, in order to ensure that the undercut groove 21 does not interfere with the joint surface 35, there is a certain distance between the undercut groove 21 and the joint surface 35 in the axial direction of the cutter head, and the distance is generally 1 to 2 mm.

[0032] Example 2

[0033] like Figures 1 to 3A cutting tool head and a wrench equipped therewith are shown in the embodiment 1, wherein the cutting tool head comprises a cutting blade 20 for cutting, a tail 40 for connecting the tool head to a tool rod, and a neck 30 between the cutting blade 20 and the tail 40; the tool head and the tool rod are tightly connected through the threaded structure of the tail 40; the neck 20 is cylindrical and has one or more tool withdrawal grooves 21 formed when processing the cutting blade 20; the wrench is used for loading and unloading the above-mentioned cutting tool head, and the wrench consists of a wrench component 1 50 and a wrench component 2 51 with a symmetrical structure; the wrench component 1 50 and the wrench component 2 51 include a wrench component 1 50 and a wrench component 2 51 connected by a cylindrical pin K The circular arc portion 53 and the handle portion 60 connected to the circular arc portion 53; the circular arc portion 53 of the wrench is provided with a groove with a notch 52, and the wrench drives the circular arc portion 53 to rotate with the cylindrical pin K as the axis by clamping the handle portion 60. When the circular arc portion 53 of the wrench is distributed at a large angle around the pin, the wrench is moved to the cutting bit, and then the handle portions 60 of the wrench component 1 50 and the wrench component 2 51 are clamped, so that the circular arc portion 53 of the wrench clamps the neck 30 of the bit, and the handle portion 60 of the wrench is clamped continuously, causing the wrench to be slightly deformed, specifically: the notch 52 on the groove gradually narrows, and the diameter D5 of the clamping part of the circular arc portion 53 of the wrench gradually decreases until the neck 30 of the bit is tightly wrapped. At this time, the wrench is rotated, and the friction between the wrench and the bit will drive the bit to rotate together, thereby completing the loading and unloading of the bit.

[0034] The arc portion 53 of the wrench is provided with a groove with a notch 52, which is radially distributed with the center of the arc portion 53 as the center; the notch 52 on the groove gradually narrows or widens with the amplitude of clamping or loosening the handle 60 of the wrench, and when the handles 60 of the wrench component 1 50 and the wrench component 2 51 are parallel, the notch 52 on the groove is in a natural state; when the handles 60 of the wrench component 1 50 and the wrench component 2 51 are loosened, that is, when the handle 60 drives the arc portion 53 to be distributed at a large angle around the pin K, the notch on the groove 52 gradually becomes wider as the handle 60 is loosened, and at this time, the cutting head neck 30 is placed in or sent out of the spanner arc portion 53; when the handle 60 of the spanner component 1 50 and the spanner component 2 51 is clamped, that is, when the handle 60 drives the arc portion 53 to be distributed at a small angle around the pin K, the notch 52 on the groove gradually becomes narrower as the handle 60 is clamped, until the spanner arc portion 53 tightly wraps the cutter head neck 30; this kind of spanner is easy to use and is suitable for loading and unloading cutting heads with different neck diameters D3.

[0035] In summary, the cutting tool head in this embodiment is used with the wrench of the present invention. At this time, since the neck 30 of the cutting tool head is not restricted by the wrench groove on the cutting tool head, and the back groove 21 does not interfere with the contact surface between the cutting tool head and the tool rod, the length of the neck 30 of the cutting tool head is shortened as much as possible, thereby reducing the adverse torque effect caused by the cutting force and reducing damage to the tool. In addition, the wrench provided by the present invention is used to load and unload the above-mentioned cutting tool head. When the arc portion 53 of the wrench clamps the neck 30 of the above-mentioned cutting tool head, it can be approximately regarded as the contact between the cylindrical surface and the cylindrical surface. The friction between the wrench and the cutting tool head will drive the cutting tool head to rotate together, thereby completing the loading and unloading of the cutting tool head. Since it is a surface-to-surface contact, the contact is more stable, which reduces the occurrence of accidents, prolongs the life of the wrench, and greatly reduces the probability of damage to the cutting tool head.

[0036] Example 3

[0037] like Figures 1 to 3 A cutting tool head and a wrench equipped therewith are shown in the embodiment 1, wherein the cutting tool head comprises a cutting blade 20 for cutting, a tail 40 for connecting the tool head to a tool rod, and a neck 30 between the cutting blade 20 and the tail 40; the tool head and the tool rod are tightly connected through the threaded structure of the tail 40; the neck 20 is cylindrical and has one or more tool withdrawal grooves 21 formed when processing the cutting blade 20; the wrench is used for loading and unloading the above-mentioned cutting tool head, and the wrench consists of a wrench component 1 50 and a wrench component 2 51 with a symmetrical structure; the wrench component 1 50 and the wrench component 2 51 include a wrench component 1 50 and a wrench component 2 51 connected by a cylindrical pin K The circular arc portion 53 and the handle portion 60 connected to the circular arc portion 53; the circular arc portion 53 of the wrench is provided with a groove with a notch 52, and the wrench drives the circular arc portion 53 to rotate with the cylindrical pin K as the axis by clamping the handle portion 60. When the circular arc portion 53 of the wrench is distributed at a large angle around the pin, the wrench is moved to the cutting bit, and then the handle portions 60 of the wrench component 1 50 and the wrench component 2 51 are clamped, so that the circular arc portion 53 of the wrench clamps the neck 30 of the bit, and the handle portion 60 of the wrench is clamped continuously, causing the wrench to be slightly deformed, specifically: the notch 52 on the groove gradually narrows, and the diameter D5 of the clamping part of the circular arc portion 53 of the wrench gradually decreases until the neck 30 of the bit is tightly wrapped. At this time, the wrench is rotated, and the friction between the wrench and the bit will drive the bit to rotate together, thereby completing the loading and unloading of the bit.

[0038] When the handle 60 connected to the arc portion 53 on the above-mentioned wrench component 1 50 and wrench component 2 51 are basically parallel, the arc portion 53 is an internally hollow cylinder, and the diameter of the cylinder, that is, the diameter D5 of the arc portion, is slightly larger than the diameter D3 of the cutter head neck, which facilitates the insertion of the cutter head neck 30 into the arc portion 53 of the wrench during loading and unloading operations.

[0039] Furthermore, when the arc portion 53 of the wrench clamps the neck 30 of the cutting bit, it can be approximately regarded as the contact between cylindrical surfaces. When the wrench is not perpendicular to the axis of the bit, that is, the wrench is not perpendicular to the axis of the bit, the wrench will be given a torque under the action of the wrench clamping force, so that the wrench is automatically perpendicular to the axis of the bit.

[0040] In summary, the cutting tool head in this embodiment is used with the wrench of the present invention. At this time, since the neck 30 of the cutting tool head is not restricted by the wrench groove on the cutting tool head, and the back groove 21 does not interfere with the contact surface between the cutting tool head and the tool rod, the length of the neck 30 of the cutting tool head is shortened as much as possible, thereby reducing the adverse torque effect caused by the cutting force and reducing damage to the tool. In addition, the wrench provided by the present invention is used to load and unload the above-mentioned cutting tool head. When the arc portion 53 of the wrench clamps the neck 30 of the above-mentioned cutting tool head, it can be approximately regarded as the contact between the cylindrical surface and the cylindrical surface. The friction between the wrench and the cutting tool head will drive the cutting tool head to rotate together, thereby completing the loading and unloading of the cutting tool head. Since it is a surface-to-surface contact, the contact is more stable, which reduces the occurrence of accidents, prolongs the life of the wrench, and greatly reduces the probability of damage to the cutting tool head.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention.

Claims

1. A wrench, characterized in that: The wrench is used to disassemble the cutting bit, and the wrench is composed of a wrench component 1 and a wrench component 2 with symmetrical structures; the wrench component 1 and the wrench component 2 include an arc portion connected by a cylindrical pin, and a handle portion connected to the arc portion; a groove with a notch is provided on the arc portion of the wrench, and the groove with a notch is radially distributed with the center of the arc portion as the center, and the notch on the groove gradually narrows or widens with the amplitude of clamping or loosening the handle of the wrench, and the wrench drives the arc portion to rotate with the cylindrical pin as the axis by clamping the handle; the arc portion clamps the neck of the above-mentioned cutting bit when the wrench is in use; The cutting head includes a cutting blade, a tail for connecting the head to a tool rod, and a neck between the cutting blade and the tail. The cutting blade is the working part of the head and is composed of a plurality of cutting edges and chip grooves between the cutting edges. The head is tightly connected to the tool rod through a threaded structure at the tail. The neck is cylindrical and has a tool retraction groove formed when machining the cutting blade.

2. A wrench according to claim 1, characterized in that: When the handles on the wrench assembly 1 and the wrench assembly 2 connected to the arc portion are substantially parallel, the arc portion is a cylinder.

3. A wrench according to claim 1, characterized in that: The diameter of the neck portion is smaller than the diameter of the blade portion.

4. A wrench according to claim 1, characterized in that: The cutting edge of the cutter head is formed by grinding with a grinding wheel.

5. A wrench according to claim 1, characterized in that: The tool recess is spaced 1 to 2 millimeters from the joint surface in the axial direction of the tool head.

6. A wrench according to claim 1, characterized in that: The surface where the cutter head and the cutter rod are firmly connected is the joining surface.

7. A wrench according to claim 6, characterized in that: When viewed from the tail to the blade, the joint surface is a complete circle.

Images