CN115383662A

CN115383662A - Cutting tool bit and spanner that is equipped with thereof

Info

Publication number: CN115383662A
Application number: CN202211222997.6A
Authority: CN
Inventors: 周焱强; 李剑锋; 杨俊鹏
Original assignee: Zhuzhou Weikai Cutting Tools Co ltd
Current assignee: Zhuzhou Weikai Cutting Tools Co ltd
Priority date: 2022-10-08
Filing date: 2022-10-08
Publication date: 2022-11-25

Abstract

The invention discloses a cutting bit and a wrench equipped with the same; the cutting tool bit comprises a blade part for cutting, a tail part for connecting the tool bit with the tool bar, and a neck part between the blade part and the tail part; a tool withdrawal groove is formed in the neck part; the wrench consists of an arc part and a handle part connected with the arc part; the cutting tool bit is provided with the wrench for use, and the length of the neck of the cutting tool bit is shortened because the neck of the cutting tool bit is not limited by the wrench groove on the cutting tool bit, so that adverse moment influence caused by cutting force is reduced, and damage to the cutting tool is reduced; in addition, when the arc part clamps the neck of the cutting tool bit, the arc part can be approximately considered to be in contact with a cylindrical surface, and the friction force between the wrench and the tool bit can drive the tool bit to rotate together, so that the loading and unloading work of the tool bit is completed.

Description

Cutting tool bit and spanner that is equipped with thereof

Technical Field

The invention relates to the technical field of rotary cutting tools and wrenches, in particular to a cutting tool bit and a wrench equipped with the cutting tool bit.

Background

The rotary cutting tool can be divided into a tool bit and a tool bar, which are firmly combined through threaded connection. In order to ensure that the instability of the wrench is avoided, the wrench needs to have a certain thickness, and therefore the wrench groove in the tool bit also needs to have a certain width and is larger than or equal to the width of the wrench. A wrench groove of this width results in an increase in the length of the head neck. During cutting, the cutting edge of the cutting bit is subjected to cutting forces that tend to cause the cutting bit to tilt about the point of contact between the cutting bit and the shank, which forces require a secure bond between the cutting bit and the tool holder. The longer the cutter head is, the larger the moment the cutter head is subjected to is, and the higher the combination firmness degree of the cutter head and the cutter bar is required to be. When the tool bit is long enough, the torque can break the engagement of the tool bit with the tool holder, resulting in damage to the tool. While an increase in the length of the neck indirectly increases the length of the cutting head, which is disadvantageous for the tool. Thus, for a knife, the shorter the neck length, the better.

On the other hand, due to manufacturing tolerances, the width of the wrench slot on the cutting bit needs to be greater than the wrench width. Thus, when the wrench is operated, the wrench contacts the wrench groove of the cutting bit in theory as two lines of contact. Because the tool bit is often hard materials such as hard alloy, and the spanner is relatively soft materials (such as steel), the pressure of the spanner and the two lines of spanner grooves on the cutting tool bit contact is extremely high, and a recess can be formed on the soft spanner, and the spanner can lose efficacy after being used too much. In practice, however, since the axis of the wrench is not perpendicular to the axis of the bit when it is applied, this can lead to inconsistent pressure at the line of contact between the wrench and the wrench slot in the cutting bit, which is greater at some point than at others, and which tends to be more prone to first dishing. The concave part of the point leads the wrench to be more easily inclined in subsequent use, thereby aggravating the early damage of the wrench; secondly, the cutting edge of the cutting bit is generally produced by a grinding process, and in the production process, a part of tool withdrawal groove is required behind the cutting edge due to the process requirement. In some bit designs, it is apparent that the effect of bit length on bit torque is taken into account, minimizing bit length. Therefore, it is inevitable that the relief groove interferes with or breaks the wrench groove on a part of the cutter head. An incomplete wrench groove obviously causes instability in the action of the wrench, possibly skewing the wrench and thus damaging the cutting edge, and also leading to rapid failure of the wrench.

The invention patent with publication number CN107030324A discloses a cutting tool, which comprises a clamping component and a cutting component mountable on the clamping component, wherein the clamping component comprises a clamping handle part and a clamping head part, the cutting component comprises a cutting head part and a cutting tail part, a clamping bulge is arranged on the end surface of the cutting tail part, and an external thread is arranged on the clamping bulge; the cutter can be divided into a cutter head and a cutter bar, the cutter head and the cutter bar are firmly combined through threaded connection, the neck of the cutter head is provided with a wrench groove which serves as an action point of a wrench, the cutting cutter is matched with a conventional wrench for use, the width of the wrench groove in the cutter head is larger than or equal to that of the wrench, the length of the neck of the cutter head is increased, the larger the moment applied to the cutter head is, the moment breaks the combination of the cutter head and the cutter bar, and the cutter is damaged.

Disclosure of Invention

In view of the above-mentioned deficiencies of the prior art, it is an object of the present invention to provide a cutting bit and a wrench therefor. The cutting bit has a shorter head portion, thereby reducing the moment to which the tail portion is subjected. Meanwhile, the wrench has the characteristics of convenience in use and long service life.

In order to achieve the purpose, the invention provides the following technical scheme:

a cutting bit comprises a cutting edge part for cutting, a tail part for connecting the bit with a cutter bar, and a neck part between the cutting edge part and the tail part; the edge part is a working part of the cutter head and consists of a plurality of cutting edges and chip flutes between the cutting edges; the cutter head is tightly connected with the cutter bar through a thread structure at the tail part; the neck is cylindrical, and the tool withdrawal groove is formed on the neck when only one or more blade parts are machined.

Further, the diameter of the neck portion is smaller than the diameter of the blade portion.

Further, the cutting edge of the cutter head is ground by a grinding wheel, and the grinding length of the grinding wheel is greater than that of the cutting edge during grinding, so that the grinding wheel interferes with the neck part, and a tool withdrawal groove is left on the neck part.

Furthermore, the surface of the cutter head firmly connected with the cutter bar is a joint surface.

Furthermore, when the joint surface is viewed from the tail part to the blade part, the joint surface is a complete circle so as to ensure the accurate connection of the cutter head and the cutter bar.

Further, in order to ensure that the tool withdrawal groove cannot interfere with the joint surface, the tool withdrawal groove and the joint surface have a certain distance in the axial direction of the tool bit, and the distance is generally 1-2 mm.

The wrench is used for disassembling the cutting tool bit and consists of a first wrench component and a second wrench component which are in symmetrical structure; the first wrench assembly and the second wrench assembly comprise circular arc parts connected through cylindrical pins and handle parts connected with the circular arc parts; be equipped with the groove of taking the breach on the circular arc portion of spanner, the spanner uses the cylinder pin to rotate each other as the axle through pressing from both sides tight stalk portion drive circular arc portion, when wrench circular arc portion becomes big angular distribution around the pin, moves the spanner to the cutting tool bit on, then presss from both sides tight wrench subassembly one and wrench subassembly two's stalk portion, makes the circular arc portion of spanner carry the neck of tool bit, continues to press from both sides tight spanner's stalk portion, causes the spanner to take place slight deformation, specifically does: the notch on the groove narrows gradually, and the diameter of the spanner circular arc portion clamping part reduces gradually until the neck of the cutter head is tightly wrapped, and the circular arc portion of the spanner can be approximately regarded as the contact of a cylindrical surface and a cylindrical surface when clamping the neck of the cutting cutter head. At the moment, the wrench is rotated, and the friction force between the wrench and the tool bit drives the tool bit to rotate together, so that the tool bit is assembled and disassembled.

Furthermore, when the handle parts connected with the arc parts on the first wrench component and the second wrench component are basically parallel, the arc parts are hollow cylinders, the diameter of each cylinder is slightly larger than that of the corresponding cutter head neck, and the cutter head neck is conveniently placed into the arc part of the wrench when the wrench is assembled and disassembled.

Furthermore, the arc part of the wrench is provided with a groove with a notch, which is distributed in a radial direction by taking the circle center of the arc part as the center.

Further, the notch on the groove gradually narrows or widens with the amplitude of clamping or releasing the handle of the wrench.

Compared with the prior art, the invention has the beneficial effects that:

the cutting tool bit provided by the invention comprises an edge part for cutting, a tail part for connecting the tool bit with the tool bar, and a neck part between the edge part and the tail part; the cutter head is tightly connected with the cutter bar through a thread structure at the tail part; the neck part is cylindrical, and the tool withdrawal groove is formed when only one or more blade parts are machined on the neck part; the cutting tool bit is provided with the wrench of the invention for use, at the moment, the cutting tool bit has no limitation of the wrench groove on the tool bit because the neck part of the cutting tool bit is not limited, and the length of the neck part of the cutting tool bit is shortened as much as possible under the condition that the tool withdrawal groove does not interfere with the contact surface of the tool bit and the tool bar, so that the adverse moment influence caused by cutting force is reduced, and the damage to the tool bit is reduced.

Secondly, the spanner is used for assembling and disassembling the cutting tool bit, when the circular arc part of the spanner clamps the neck of the cutting tool bit, the circular arc part of the spanner can be approximately regarded as the contact of a cylindrical surface and the cylindrical surface, and the friction force between the spanner and the tool bit can drive the tool bit to rotate together, so that the assembling and disassembling work of the tool bit is completed.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic view of a cutting insert;

FIG. 2 is a schematic cross-sectional view of a neck portion of a tool bit;

fig. 3 is a schematic view of the wrench.

Wherein, in the figures, the respective reference numerals: 20. a blade part; 21. a tool withdrawal groove; 30. a neck portion; 40. a tail portion; 35. a bonding surface; 50. a first wrench component; 51. a second wrench component; 52. a notch in the groove; 53: a circular arc portion; 60. a handle; K. a cylindrical pin; D2. the diameter of the blade part; D3. the diameter of the neck; D5. the diameter of the arc portion.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

A cutting bit as shown in fig. 1-2, which includes an edge portion 20 for cutting, a tail portion 40 for connecting the bit with a tool holder, and a neck portion 30 interposed between the edge portion 20 and the tail portion 40; the blade part 20 is a working part of a cutter head and consists of a plurality of cutting edges and chip flutes between the cutting edges; the cutter head is tightly connected with the cutter bar through a thread structure at the tail part 40, and the convenient disassembly of the cutting cutter head is realized through the thread structure; the neck 30 is cylindrical and has relief grooves 21 formed therein when only one or more cutting edges are machined, and the diameter D3 of the neck is smaller than the diameter D2 of the cutting edges.

The cutting edge on the blade edge is ground by a grinding wheel, and the grinding length of the grinding wheel is longer than the cutting edge during grinding, so that the grinding wheel interferes with the neck portion 30, and the relief groove 21 is left in the neck portion 30.

Further, the surface of the cutter head firmly connected with the cutter bar is a joint surface 35, and the joint surface 35 is a complete circle when viewed from the tail part 40 to the blade part 20, so as to ensure the accurate connection of the cutter head and the cutter bar.

Further, to ensure that the relief groove 21 cannot interfere with the joint surface 35, the relief groove 21 and the joint surface 35 have a certain distance in the axial direction of the cutter head, which is generally 1 to 2 mm.

Example 2

A cutting bit and a wrench equipped thereto as shown in fig. 1 to 3, the cutting bit as shown in embodiment 1, the cutting bit comprising a blade portion 20 for cutting, a tail portion 40 for connecting the bit with a tool holder, and a neck portion 30 between the blade portion 20 and the tail portion 40; the cutter head is tightly connected with the cutter bar through a thread structure at the tail part 40; the neck part 20 is cylindrical, and is provided with a tool withdrawal groove 21 formed when only one or more blade parts 20 are machined; the wrench is used for assembling and disassembling the cutting tool bit and consists of a first wrench assembly 50 and a second wrench assembly 51 which are of symmetrical structures; the first wrench assembly 50 and the second wrench assembly 51 comprise circular arc parts 53 connected through cylindrical pins K and handle parts 60 connected with the circular arc parts 53; be equipped with the groove of taking breach 52 on the circular arc portion 53 of spanner, the spanner drives circular arc portion 53 through pressing from both sides tight stalk portion 60 and uses cylinder pin K to rotate each other as the axle, when wrench circular arc portion 53 distributes around the big angle of pin one-tenth, move the spanner to the cutting tool bit, then press from both sides tight wrench assembly one 50 and wrench assembly two 51's stalk portion 60, make the circular arc portion 53 of spanner carry the neck 30 of tool bit, continue to press from both sides tight stalk portion 60 of spanner, cause the spanner to take place slight deformation, specifically do: the notch 52 in the groove is gradually narrowed and the diameter D5 of the gripping portion of the wrench arc 53 is gradually reduced until the head neck 30 is tightly wrapped. At the moment, the wrench is rotated, and the friction force between the wrench and the tool bit drives the tool bit to rotate together, so that the tool bit is assembled and disassembled.

The arc part 53 of the wrench is provided with a groove with a notch 52, which is radially distributed by taking the center of a circle of the arc part 53 as the center; the notch 52 on the groove is gradually narrowed or widened along with the amplitude of clamping or loosening the handle 60 of the wrench, and when the notch 52 on the groove is parallel to the handle 60 of the wrench assembly I50 and the wrench assembly II 51, the notch 52 is in a natural state; when the handle parts 60 of the first wrench assembly 50 and the second wrench assembly 51 are loosened, namely the handle parts 60 drive the circular arc parts 53 to be distributed around the pin K at a large angle, the notches 52 on the grooves gradually widen along with the loosening amplitude of the handle parts 60, and at the moment, the operation of putting the head and neck parts 30 of the cutting tool into or sending the circular arc parts 53 of the wrench is carried out; clamping the handle parts 60 of the first wrench assembly 50 and the second wrench assembly 51, namely when the handle parts 60 drive the arc parts 53 to form small-angle distribution around the pins K, the notches 52 on the grooves gradually narrow along with the clamping amplitude of the handle parts 60 until the wrench arc parts 53 tightly wrap the neck part 30 of the tool bit; adopt this kind of spanner, convenient to use is applicable to the multiple neck diameter D3 of loading and unloading and has a cutting tool bit.

In summary, the cutting insert of the present embodiment is used with the wrench of the present invention, and the cutting insert has the insert neck 30 without the restriction of the wrench groove on the insert, so that the length of the insert neck 30 is shortened as much as possible without the tool escape 21 interfering with the contact surface between the insert and the holder, thereby reducing adverse torque effect caused by cutting force and reducing damage to the tool. In addition, the spanner provided by the invention is used for assembling and disassembling the cutting bit, when the arc part 53 of the spanner clamps the neck part 30 of the cutting bit, the contact between a cylindrical surface and the cylindrical surface can be approximately considered, the friction force between the spanner and the cutting bit drives the cutting bit to rotate together, and the assembling and disassembling work of the cutting bit is completed.

Example 3

A cutting bit and a wrench equipped thereto as shown in fig. 1 to 3, the cutting bit as shown in embodiment 1 includes a cutting edge portion 20 for cutting, a tail portion 40 for connecting the cutting bit to a tool shank, and a neck portion 30 between the cutting edge portion 20 and the tail portion 40; the cutter head is tightly connected with the cutter bar through a thread structure at the tail part 40; the neck part 20 is cylindrical, and is provided with a tool withdrawal groove 21 formed when only one or more blade parts 20 are machined; the wrench is used for assembling and disassembling the cutting tool bit and consists of a first wrench assembly 50 and a second wrench assembly 51 which are of symmetrical structures; the first wrench assembly 50 and the second wrench assembly 51 comprise circular arc parts 53 connected through cylindrical pins K and handle parts 60 connected with the circular arc parts 53; be equipped with the groove of taking breach 52 on the circular arc portion 53 of spanner, the spanner drives circular arc portion 53 through pressing from both sides tight stalk portion 60 and uses cylinder pin K to rotate each other as the axle, when wrench circular arc portion 53 becomes big angular distribution around the pin, moves the spanner to the cutting tool bit, then presss from both sides tight wrench subassembly one 50 and wrench subassembly two 51 stalk portion 60, makes the circular arc portion 53 of spanner carry the neck 30 of tool bit, continues to press from both sides tight stalk portion 60 of spanner, causes the spanner to take place slight deformation, specifically is: the notch 52 in the groove is gradually narrowed and the diameter D5 of the gripping portion of the wrench arc 53 is gradually reduced until the head neck 30 is tightly wrapped. At the moment, the wrench is rotated, and the friction force between the wrench and the tool bit drives the tool bit to rotate together, so that the tool bit is assembled and disassembled.

When the handle portions 60 of the first wrench assembly 50 and the second wrench assembly 51 connected to the arc portion 53 are substantially parallel, the arc portion 53 is a cylinder with a hollow interior, and the diameter of the cylinder, that is, the diameter D5 of the arc portion, is slightly larger than the diameter D3 of the bit neck, so that the bit neck 30 can be conveniently placed into the arc portion 53 of the wrench when the wrench is used for loading and unloading.

Further, when the circular arc portion 53 of the wrench clamps the neck portion 30 of the cutting bit, it can be approximately considered as the contact between the cylindrical surface and the cylindrical surface, and when the wrench is not perpendicular to the axis of the cutting bit, that is, when the wrench is not perpendicular to the axis of the cutting bit, a torque is given to the wrench under the clamping force of the wrench, so that the wrench is automatically perpendicular to the axis of the cutting bit.

In summary, the cutting insert of the present embodiment is used with the wrench of the present invention, and the cutting insert has the insert neck portion 30 without the restriction of the wrench groove on the insert, so that the length of the insert neck portion 30 can be shortened as much as possible without the tool recession 21 interfering with the contact surface between the insert and the holder, thereby reducing adverse torque effects caused by cutting forces and reducing damage to the insert. In addition, the wrench provided by the invention is used for assembling and disassembling the cutting bit, when the circular arc part 53 of the wrench clamps the neck part 30 of the cutting bit, the contact between a cylindrical surface and the cylindrical surface can be approximately considered, and the friction force between the wrench and the cutting bit drives the cutting bit to rotate together, so that the assembling and disassembling work of the cutting bit is completed.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A cutting bit is characterized by comprising an edge part for cutting, a tail part for connecting the bit with a cutter bar, and a neck part between the edge part and the tail part; the edge part is a working part of the cutter head and consists of a plurality of cutting edges and chip flutes between the cutting edges; the cutter head is tightly connected with the cutter bar through a thread structure at the tail part; the neck is cylindrical, and a tool withdrawal groove formed when the blade part is machined is formed in the neck.

2. The cutting bit of claim 1 wherein the neck has a diameter less than the diameter of the blade.

3. The cutting bit of claim 1, wherein the cutting edge of the bit is ground with a grinding wheel.

4. The cutting insert according to claim 1, wherein the relief groove is spaced from the bonding surface by a distance of 1 to 2 mm in an axial direction of the insert.

5. A cutting insert as claimed in claim 1, wherein the surface of the insert to which the shank is fixedly connected is a faying surface.

6. A cutting bit according to claim 5, wherein the engagement surface is a complete circle when viewed from the tail portion to the blade portion.

7. A wrench for loading and unloading a cutting bit according to any of claims 1-6, the wrench comprising a first wrench member and a second wrench member configured to present a symmetrical configuration; the first wrench assembly and the second wrench assembly comprise arc parts connected through cylindrical pins and handle parts connected with the arc parts; the arc part of the wrench is provided with a groove with a notch, and the wrench drives the arc part to rotate mutually by taking the cylindrical pin as an axis through the clamping handle part; the arc portion clamps the neck portion of the cutting bit when the wrench is used.

8. A wrench as claimed in claim 7, wherein the arcuate portion is a cylinder when the shanks of the first and second wrench members which engage the arcuate portion are substantially parallel.

9. A wrench as claimed in claim 7, wherein the arcuate portion of the wrench has a plurality of slots with notches radially spaced about the center of the arcuate portion.

10. A wrench as claimed in claim 9, wherein the slot is tapered or widened with the extent of tightening or loosening the handle of the wrench.