阅读说明：本技术 一种新型冷却后拉式齿冠刀头 (Novel draw formula crown tool bit after cooling ) 是由 殷亚军 欧望达 沈钰 甘其龙 于 2021-01-08 设计创作，主要内容包括：本发明提供了一种新型冷却后拉式齿冠刀头,其使得齿冠刀头通过后拉式结构和钻杆完成锁紧,使得锁紧稳固可靠,且使得冷却液直接冷却齿冠刀头的切削刃,冷却效果好。钻杆的工作部的外周设置有螺旋排屑槽和刀背,所述工作部的前端中心位置内凹形成齿冠刀头定位腔,所述齿冠刀头嵌装于所述齿冠刀头定位腔,所述齿冠刀头包括后端内凹的锁紧螺纹孔,所述齿冠刀头的锁紧螺纹孔连接拉紧螺钉的前端螺纹,所述工作部的齿冠刀头定位腔的轴向内端设置有内凹中心螺纹孔,所述拉紧螺钉的后端螺纹连接所述内凹中心螺纹孔,所述拉紧螺钉的前端螺纹和后端螺纹的旋向相反,所述钻杆的轴向中心位置设置有主冷却孔,所述内凹中心螺纹孔连通所述主冷却孔。(The invention provides a novel cooling back-pull type tooth crown tool bit, which enables the tooth crown tool bit to be locked through a back-pull type structure and a drill rod, enables locking to be stable and reliable, enables a cooling liquid to directly cool a cutting edge of the tooth crown tool bit, and is good in cooling effect. The periphery of the working portion of drilling rod is provided with spiral chip groove and the back of a knife blade, the front end central point of working portion puts the indent and forms tooth crown tool bit location chamber, the tooth crown tool bit inlay and adorn in tooth crown tool bit location chamber, the tooth crown tool bit includes the locking screw hole of rear end indent, the locking screw hole of tooth crown tool bit connects straining screw's front end screw thread, the axial inner in tooth crown tool bit location chamber of working portion is provided with indent central point screw hole, straining screw's rear end threaded connection indent central point screw hole, straining screw's front end screw thread and rear end screw thread revolve to opposite, the axial central point of drilling rod puts and is provided with main cooling hole, indent central point screw hole intercommunication main cooling hole.)

1. The utility model provides a novel draw formula crown tool bit after cooling which characterized in that: the drilling rod comprises a drilling rod and a crown cutter head, the drilling rod comprises a working part, a neck part and a handle part, a spiral chip groove and a cutter back are arranged on the periphery of the working part of the drilling rod, the front end central position of the working part is concave to form a crown cutter head positioning cavity, the crown cutter head is embedded in the crown cutter head positioning cavity, the crown cutter head comprises a locking threaded hole concave at the rear end, the locking threaded hole of the crown cutter head is connected with the front end thread of a tensioning screw, the axial inner end of the crown cutter head positioning cavity of the working part is provided with a concave central threaded hole, the rear end thread of the tensioning screw is connected with the concave central threaded hole, the front end thread and the rear end thread of the tensioning screw are opposite in rotation direction, the axial central position of the drilling rod is provided with a main cooling hole, the concave central threaded hole is communicated with the main cooling hole, and the periphery of the front end of the main cooling hole, which faces the, the orientation of main cooling hole the position of tip backstop face in tooth crown tool bit location chamber is provided with two liquid outlets, the periphery of tooth crown tool bit is provided with out the liquid breach groove corresponding to the position of liquid outlet, the inner wall in tooth crown tool bit location chamber is provided with out the liquid inner groovy corresponding to the position of liquid outlet, under the equipment state the rear end plane of tooth crown tool bit with the tip backstop face plane in tooth crown tool bit location chamber is hugged closely and is arranged, and the play liquid breach groove that corresponds the position forms liquid outlet channel with play liquid inner groovy amalgamation, the working portion equipment of tooth crown tool bit and drilling rod forms overall structure after targetting in place, the both sides obtuse angle locating surface of tooth crown tool bit is symmetrical structure, both sides obtuse angle locating surface is positioned respectively the backstop position of the profile modeling location inner wall in tooth crown tool bit location.

2. The novel cooling back-pull type crown bit according to claim 1, characterized in that: two bypass pipelines are arranged on the periphery of the front end of the main cooling hole facing the working portion to form a Y-shaped passage outlet, and the Y-shaped passage outlet is communicated to the liquid outlet through a branch.

3. The novel cooling back-pull type crown bit according to claim 1, characterized in that: the central line formed by the obtuse angle positioning surfaces on the two sides is coincided with the central line of the locking threaded hole, the angle of the obtuse angle positioning surfaces ranges from 100 degrees to 154 degrees, and the liquid outlet notch groove is arranged in the surface area region of the obtuse angle positioning surfaces in a concave mode.

4. The novel cooling back-pull type crown bit according to claim 1, characterized in that: the inner thread of the locking threaded hole is sleeved with the outer ring of the steel wire thread insert, and the front end thread of the tensioning screw is in threaded fastening threaded connection with the inner ring thread of the steel wire thread insert.

5. The novel cooling back-pull type crown bit according to claim 1, characterized in that: the obtuse angle positioning surfaces on the two sides are of clearance structures.

6. The novel cooling back-pull type crown bit according to claim 1, characterized in that: the tooth crown tool bit comprises a rear end plane, a cylindrical peripheral surface and a vertex angle, after the rear end plane is ground in advance, the locking threaded hole is machined and formed in the center of the rear end plane, then the steel wire thread insert is fixedly inserted into the locking threaded hole, then the vertex angle is ground, then the cylindrical peripheral surface is ground by taking the vertex angle and the locking threaded hole as references, then obtuse angle positioning surfaces at two sides and liquid outlet notch grooves at two sides are formed in the cylindrical peripheral surface in a grinding mode, and the central lines of the obtuse angle positioning surfaces at two sides are enabled to be arranged in a superposition mode with the central line of the locking threaded hole; then grinding cylindrical surface parts of a chip groove and a back to form an edge, wherein the helical angle of the chip groove is 0-35 degrees; and then grinding the rear cutter face and the chip pocket to form a main blade and an inner blade, forming a transition blade between the main blade and the inner blade, wherein the inner blade is 1/4-1/2 of the main blade, the arc radius R of the transition blade is 0.1-3 mm, two groups of inner blades are combined to form a chisel blade, and the crown cutter head comprises a rear end plane and is also provided with a guide surface corresponding to the periphery of the bottom of the positioning cavity.

Technical Field

The invention relates to the technical field of cutting tool structures, in particular to a novel cooling back-pull type tooth crown tool bit.

Background

Along with the rapid development of industries such as engineering machinery, heat exchangers, wind power and the like, large-diameter holes are machined more and more, the whole hard alloy drill bit is expensive and high in machining cost, the crown bit is a combined drill bit with the head made of hard alloy or other high-performance materials, the drill rod made of alloy steel materials, and the combined drill bit is suitable for machining large-diameter holes and has the advantages of being low in use cost and large in machining range.

The head of the existing crown cutter head and a drill rod have multiple combination modes, the cooling mode is that a cooling hole sprays to inclined planes on two sides, the cutting edge of the crown cutter head cannot be directly cooled, and the cooling effect is poor.

Disclosure of Invention

In order to solve the problems, the invention provides a novel cooling back-pull type tooth crown tool bit which enables the tooth crown tool bit to be locked through a back-pull type structure and a drill rod, so that the locking is stable and reliable, a cooling liquid directly cools a cutting edge of the tooth crown tool bit, and the cooling effect is good.

The utility model provides a novel draw formula crown tool bit after cooling which characterized in that: the drilling rod comprises a drilling rod and a crown cutter head, the drilling rod comprises a working part, a neck part and a handle part, a spiral chip groove and a cutter back are arranged on the periphery of the working part of the drilling rod, the front end central position of the working part is concave to form a crown cutter head positioning cavity, the crown cutter head is embedded in the crown cutter head positioning cavity, the crown cutter head comprises a locking threaded hole concave at the rear end, the locking threaded hole of the crown cutter head is connected with the front end thread of a tensioning screw, the axial inner end of the crown cutter head positioning cavity of the working part is provided with a concave central threaded hole, the rear end thread of the tensioning screw is connected with the concave central threaded hole, the front end thread and the rear end thread of the tensioning screw are opposite in rotation direction, the axial central position of the drilling rod is provided with a main cooling hole, the concave central threaded hole is communicated with the main cooling hole, and the periphery of the front end of the main cooling hole, which faces the, the orientation of main cooling hole the position of tip backstop face in tooth crown tool bit location chamber is provided with two liquid outlets, the periphery of tooth crown tool bit is provided with out the liquid breach groove corresponding to the position of liquid outlet, the inner wall in tooth crown tool bit location chamber is provided with out the liquid inner groovy corresponding to the position of liquid outlet, under the equipment state the rear end plane of tooth crown tool bit with the tip backstop face plane in tooth crown tool bit location chamber is hugged closely and is arranged, and the play liquid breach groove that corresponds the position forms liquid outlet channel with play liquid inner groovy amalgamation, the working portion equipment of tooth crown tool bit and drilling rod forms overall structure after targetting in place, the both sides obtuse angle locating surface of tooth crown tool bit is symmetrical structure, both sides obtuse angle locating surface is positioned respectively the backstop position of the profile modeling location inner wall in tooth crown tool bit location.

It is further characterized in that:

two bypass pipelines are arranged on the periphery of the front end of the main cooling hole facing the working part to form a Y-shaped passage outlet, and the Y-shaped passage outlet is communicated to the liquid outlet through a branch;

the central line formed by the obtuse angle positioning surfaces on the two sides is superposed with the central line of the locking threaded hole, the angle of the obtuse angle positioning surfaces is 100-154 degrees, and the liquid outlet notch groove is arranged in the surface area of the obtuse angle positioning surfaces in a concave manner;

the inner thread of the locking threaded hole is sleeved with the outer ring circumference of the steel wire thread insert, and the front end thread of the tensioning screw is in threaded fastening connection with the inner ring thread of the steel wire thread insert, so that the crown bit can be repeatedly assembled and disassembled for many times, and the thread of the locking threaded hole of the crown bit is not easy to break and break;

the obtuse angle positioning surfaces on the two sides are of clearance structures, the obtuse angle positioning surfaces on the two sides enter the drill rod along the guiding and positioning inner wall in the installation process, the installation is simple and reliable, the precision is high, the clearance surface is arranged at the joint of the obtuse angle positioning surfaces on each side, and each positioning surface is in independent contact in the installation process and cannot influence each other;

the tooth crown tool bit comprises a rear end plane, a cylindrical peripheral surface and a vertex angle, after the rear end plane is ground in advance, the locking threaded hole is machined and formed in the center of the rear end plane, then the steel wire thread insert is fixedly inserted into the locking threaded hole, then the vertex angle is ground, then the cylindrical peripheral surface is ground by taking the vertex angle and the locking threaded hole as references, then obtuse angle positioning surfaces at two sides and liquid outlet notch grooves at two sides are formed in the cylindrical peripheral surface in a grinding mode, and the central lines of the obtuse angle positioning surfaces at two sides are enabled to be arranged in a superposition mode with the central line of the locking threaded hole; then grinding cylindrical surface parts of a chip groove and a back to form an edge, wherein the helical angle of the chip groove is 0-35 degrees; and then grinding the rear cutter face and the chip pocket to form a main blade and an inner blade, forming a transition blade between the main blade and the inner blade, wherein the inner blade is 1/4-1/2 of the main blade, the arc radius R of the transition blade is 0.1-3 mm, two groups of inner blades are combined to form a chisel blade, and the crown cutter head comprises a rear end plane and is also provided with a guide surface corresponding to the periphery of the bottom of the positioning cavity.

After the invention is adopted, the locking threaded hole of the crown cutter head is connected with at least one part of the front end thread of the tensioning screw, a certain front end thread screwing installation gap is reserved during preassembly, then the crown cutter head is positioned in the crown cutter head positioning cavity, the rear end thread of the tensioning screw is connected with the concave central threaded hole, the tensioning screw is screwed by the hexagon socket wrench after penetrating through the main cooling hole, so that the rear end thread of the tensioning screw is connected with the concave central threaded hole, meanwhile, the rear end surface of the crown cutter head and the end stop surface plane of the crown cutter head positioning cavity are closely arranged to complete tensioning locking, the crown cutter head is locked with the drill rod through a back-pull structure, the locking is stable and reliable, in addition, two liquid outlets are arranged at the position of the main cooling hole, which faces the end stop surface of the crown cutter head positioning cavity, and a liquid outlet notch groove is arranged at the position of the periphery of the crown cutter, the inner wall of the tooth crown tool bit positioning cavity is provided with a liquid outlet inner groove corresponding to the position of the liquid outlet, and the liquid outlet notch groove and the liquid outlet inner groove which correspond to the position in the assembling state are spliced to form a liquid outlet channel, so that the cooling liquid directly cools the cutting edge of the tooth crown tool bit, and the cooling effect is good.

Drawings

FIG. 1 is a schematic view (partially in section) of the present invention with the crown bit and the drill stem separated;

FIG. 2 is a front view schematic of the crown bit of the present invention;

FIG. 3 is a schematic view of section A-A of FIG. 2;

FIG. 4 is a schematic view of section B-B of FIG. 2;

FIG. 5 is a schematic top view of the structure of FIG. 2;

FIG. 6 is a schematic left side view of the structure of FIG. 2;

the names corresponding to the sequence numbers in the figure are as follows:

the drill rod 1, a working part 101, a neck part 102, a handle part 103, a spiral chip groove 104, a tool back 105, a tooth crown tool bit positioning cavity 106, a concave central threaded hole 107, a main cooling hole 108, a bypass pipeline 109, a liquid outlet 110, a liquid outlet inner groove 111, a branch 112, a tooth crown tool bit 2, a tensioning screw 3, a front end thread 31, a rear end thread 32, a liquid outlet notch groove 4, a rear end plane 5, an obtuse angle positioning surface 6, a locking threaded hole 7, a steel wire thread sleeve 8, a clearance surface 9, a cylindrical peripheral surface 10, a vertex angle 11, a chip groove 12, a back 13, an edge 14, a rear tool face 15, a chip groove 16, a main edge 17, an inner edge 18, a transition edge 19, a cross edge 20 and a guide surface 21.

Detailed Description

A novel cooling back-pull type tooth crown cutter head is shown in figures 1-6: the drill rod comprises a drill rod 1 and a crown bit 2, wherein the drill rod 1 comprises a working part 101, a neck part 102 and a handle part 103, a spiral chip groove 104 and a back of a tool 105 are arranged on the periphery of the working part 101 of the drill rod 1, a crown bit positioning cavity 106 is formed by recessing the front end center position of the working part 101, the crown bit 2 is embedded in the crown bit positioning cavity 106, the crown bit 200 comprises a locking threaded hole 7 with a recessing back end, the locking threaded hole 7 of the crown bit 2 is connected with a front end thread 31 of a tensioning screw 3, an axial inner end of the crown bit positioning cavity 106 of the working part 101 is provided with a recessing center threaded hole 107, a back end thread 32 of the tensioning screw 3 is connected with the recessing center threaded hole 107, the turning directions of the front end thread 31 and the back end thread 32 of the tensioning screw 3 are opposite, a main cooling hole 108 is arranged on the axial center position of the drill rod 1, the recessing center threaded hole 107 is communicated with the main cooling hole 108, at least two, the position of the end stop surface of the main cooling hole 108 facing the crown bit positioning cavity 106 is provided with two liquid outlets 110, the position of the periphery of the crown bit 2 corresponding to the liquid outlets 110 is provided with a liquid outlet notch 4, the position of the inner wall of the crown bit positioning cavity 106 corresponding to the liquid outlets 110 is provided with a liquid outlet inner groove 111, the rear end plane 5 of the crown bit 2 and the end stop surface plane of the crown bit positioning cavity 106 in an assembled state are arranged in a close fit manner, the liquid outlet notch 4 and the liquid outlet inner groove 111 in corresponding positions are spliced to form a liquid outlet channel, the working part 101 of the crown bit 2 and the drill rod 1 are assembled in place to form an integral structure, the two side obtuse angle positioning surfaces 6 of the crown bit 2 are of a symmetrical structure, and the two side obtuse angle positioning surfaces 6 are respectively positioned at the stop positions of the profiling positioning inner wall of the crown bit positioning cavity.

Two bypass pipelines 109 are arranged on the periphery of the front end of the main cooling hole 108 facing the working part 101 to form Y-shaped passage outlets, and the Y-shaped passage outlets are respectively communicated to the liquid outlet 110 through branches 112;

the central line formed by the obtuse angle positioning surfaces 6 on the two sides is superposed with the central line of the locking threaded hole 7, the angle of the obtuse angle positioning surface 6 is 100-154 degrees, and the liquid outlet notch groove 4 is arranged in the surface area of the obtuse angle positioning surface 6 in a concave manner;

the inner thread of the locking threaded hole 7 is sleeved with the outer ring circumference of the steel wire thread insert 8, and the front end thread 31 of the tensioning screw 3 is fastened and in threaded connection with the inner ring thread of the steel wire thread insert 8, so that the tooth crown cutter head 2 can be repeatedly assembled and disassembled for many times, and the thread of the locking threaded hole 7 of the tooth crown cutter head 2 is not easy to break and break;

the obtuse angle positioning surfaces 6 on the two sides are of clearance structures, the obtuse angle positioning surfaces 6 on the two sides enter the drill rod 1 along the guiding and positioning inner wall in the installation process, the installation is simple and reliable, the precision is high, the clearance avoiding surface 9 is arranged at the joint of the obtuse angle positioning surfaces 6 on each side, and each positioning surface is in independent contact in the installation process and cannot influence each other;

the crown bit 2 is specifically processed as follows: the tooth crown tool bit 2 comprises a rear end plane 5, a cylindrical peripheral surface 10 and an apex angle 11, after the rear end plane 5 is ground in advance, a locking threaded hole 7 is machined and formed in the center position of the rear end plane 5, then a steel wire thread sleeve 8 is fixedly inserted into the locking threaded hole, then the apex angle 11 is ground, then the apex angle 11 and the locking threaded hole 7 are used as references, the cylindrical peripheral surface 10 is ground, then obtuse angle positioning surfaces 6 on two sides and liquid outlet notch grooves 4 on two sides are formed in the cylindrical peripheral surface 10 in a grinding mode, and the center lines of the obtuse angle positioning surfaces 6 on two sides are overlapped with the center line of the locking threaded hole 7; then grinding cylindrical surface parts of a chip groove 12 and a back 13 to form an edge 14, wherein the helical angle alpha of the chip groove 12 is 0-35 degrees; and then grinding a rear cutter face 15 and a chip groove 16 to form a main blade 17 and an inner blade 18, forming a transition blade 19 between the main blade 17 and the inner blade 18, wherein the size of the inner blade 18 is 1/4-1/2 of the main blade 17, the circular arc radius R of the transition blade 19 is 0.1-3 mm, and the two groups of inner blades 18 are combined to form a chisel blade 20.

The assembly process and the working principle are as follows: the locking threaded hole of the crown cutter head is connected with at least one part of the front end thread of the tensioning screw, a certain front end thread screwing installation gap is reserved during preassembling, then the crown cutter head is positioned in the crown cutter head positioning cavity, the rear end thread of the tensioning screw is connected with the concave central threaded hole, the tensioning screw is screwed by the hexagon socket wrench after penetrating through the main cooling hole, so that the rear end thread of the tensioning screw is connected with the concave central threaded hole, meanwhile, the rear end surface of the crown cutter head and the end stop surface plane of the crown cutter head positioning cavity are closely arranged to complete tensioning locking, the crown cutter head is locked through a pull-back structure and a drill rod, the locking is stable and reliable, in addition, two liquid outlets are arranged at the position of the main cooling hole, which faces the end stop surface of the crown cutter head positioning cavity, a liquid outlet notch groove is arranged at the position of the periphery of the crown cutter head, which corresponds to the liquid outlet, and an inner liquid outlet groove is arranged at the, the liquid outlet notch groove and the liquid outlet inner groove at the corresponding position in the assembled state are spliced to form a liquid outlet channel, so that the cooling liquid directly cools the cutting edge of the crown cutter head, and the cooling effect is good.

The obtuse angle locating surfaces on two sides adopt symmetrical design, the tool bit and the tool bar adopt interference fit mode locking, locking adopts the center of a tensioning screw to pull backwards, locking force is superstrong, the center locking thread of the tooth crown tool bit adopts the design of machine body threaded hole + alloy steel swivel nut, repeated loading and unloading many times, machine body threads are difficult to break teeth, collapse and break, the rear end plane of the tooth crown tool bit and the contact area of drill rod laminating are large, stability is high during drilling, the noise is small, the obtuse angle locating surfaces on two sides of the tooth crown tool bit adopt the design of avoiding empty, self-guide gets into the drill rod during installation, the installation is simple and reliable, and the. The joint of the two positioning surfaces is processed to form the clearance avoiding surface, and each positioning surface is in independent contact during installation and cannot influence each other.

The beneficial effects are as follows: the tooth crown tool bit and the drill rod are in gapless fit, and the rigidity is good; the cutter head positioning surface is simple and reliable, and the universality is strong; the sectional area of the back of the cutter head is large, the strength of the cutter head is high, and the cutter head can be suitable for processing under various working conditions; the blade part of the cutter head can be designed into various blade shapes, and is suitable for processing different materials; the cutter head is installed in a gapless fit manner, and the service life of the cutter head is long; the cooling hole is directly sprayed out from the cutter head and directly acts on the cutting edge, and the cooling effect is good.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.