CN216325380U

CN216325380U - Efficient drilling reamer

Info

Publication number: CN216325380U
Application number: CN202122014807.9U
Authority: CN
Inventors: 龙明主; 廖云龙
Original assignee: Dongguan Chang Ye Tool Co ltd
Current assignee: Dongguan Chang Ye Tool Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-04-19
Anticipated expiration: 2031-08-25

Abstract

The utility model relates to the technical field of cutter equipment, in particular to a high-efficiency drilling reamer which comprises a drilling reamer base body, wherein the drilling reamer base body comprises a drilling head part, a clearance part, a reamer part and a cutter handle part, the drilling head part, the clearance part, the reamer part and the cutter handle part are integrally formed, two drill bit cutting edges spirally extending backwards along the axial direction are arranged on the periphery of the drilling head part, a drill bit cutter groove is formed between every two adjacent drill bit cutting edges, the starting end of the drill bit cutter groove starts from the head end of the drilling reamer base body, and the tail end of the drill bit cutter groove is positioned at the clearance part; six reamer cutting edges extending backwards along the axial direction are arranged on the periphery of the reamer part, a reamer cutter groove is arranged between every two adjacent reamer cutting edges, the initial end of the reamer cutter groove is located at the clearance part, and the tail end of the reamer cutter groove is located at the cutter handle part; the positions of the drill cutter groove and the reamer cutter groove on the clearance part are not mutually interfered and overlapped; the utility model can be formed in one step when processing holes with high requirements, is efficient and convenient, and can ensure the roughness requirement after the surface of a workpiece is processed.

Description

Efficient drilling reamer

Technical Field

The utility model relates to the technical field of cutter equipment, in particular to a high-efficiency drilling reamer.

Background

Due to the continuous development of society and the continuous progress of science and technology, especially in the field of machine manufacturing, the technology is rapidly advanced, and in order to improve the respective production capacity and reduce the production cost, various companies want to improve the technology by a method so as to seek a higher-speed and effective scheme for production.

When a hole with high requirements is machined in the mechanical industry at present, a drill bit is used for drilling the hole, and then a reamer is used for finishing the hole, so that not only are matched cutters used together, but also a feed path during machining is required, the roughness requirement after the surface of a workpiece is machined needs to be ensured, the workload of workers is increased, and the machining efficiency is reduced; in addition, a plurality of machines are matched for a plurality of machine tools with single grinding heads, so that the machining cost and the machine tool cost are higher.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an efficient drilling reamer which can be formed at one time when a hole with high requirements is machined, is efficient and convenient, and can ensure the roughness requirement of the machined surface of a workpiece.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a high-efficiency drilling reamer comprises a drilling reamer base body, wherein the drilling reamer base body comprises a drilling head part, a clearance part, a reamer part and a cutter handle part, the drilling head part, the clearance part, the reamer part and the cutter handle part are integrally formed and are sequentially arranged on the drilling reamer base body from front to back, and the diameters and the lengths of the drilling head part, the clearance part, the reamer part and the cutter handle part are different;

two drill bit cutting edges spirally extending backwards along the axial direction are arranged on the periphery of the drill bit part, a drill bit cutter groove is arranged between every two adjacent drill bit cutting edges, the starting end of the drill bit cutter groove starts from the head end of the drilling reamer base body, and the tail end of the drill bit cutter groove is located at the clearance part;

six reamer cutting edges extending backwards along the axial direction are formed in the periphery of the reamer part, a reamer cutter groove is formed between every two adjacent reamer cutting edges, the starting end of the reamer cutter groove is located at the space avoiding part, and the tail end of the reamer cutter groove is located at the cutter handle part;

the positions of the drill cutter grooves and the reamer cutter grooves on the clearance avoiding part are not mutually interfered and overlapped;

the top of handle of a knife portion is equipped with first chamfer portion, first chamfer portion is equipped with the chamfer sword, the end of handle of a knife portion is equipped with second chamfer portion, second chamfer portion is equipped with reverse chamfer sword.

Preferably, the drill cutting edges include a primary cutting edge and a secondary cutting edge;

the front end in drill bit sword groove is the toper rake face, the terminal surface of drill bit portion is equipped with two toper back knife faces, main cutting edge does the back knife face with the intersect of rake face, main cutting edge along the border in drill bit sword groove forms vice cutting edge, main cutting edge with the nodical point of vice cutting edge forms the drill point, two the intersect of back knife face forms the chisel edge, main cutting edge with be equipped with into the cutting edge between the chisel edge.

Preferably, the top angle of the drill bit part is 118 degrees; the length of the chisel edge is 0.12-0.18mm, the chisel edge is provided with a chisel edge angle, and the chisel edge angle is 58 degrees; the knife feeding edge is provided with a knife feeding angle which is 30 degrees.

Preferably, one side of the main cutting edge, which is close to the rear tool face, is provided with a main cutting edge zone, the main cutting edge zone is provided with a chip breaker, the radius of the chip breaker is 0.2mm, the axial relief angle of the chip breaker is 13 degrees, and the radial relief angle of the chip breaker is 12 degrees.

Preferably, the end of the primary cutting land and the drill tip form a first drill tip relief angle and a second drill tip relief angle, the first drill tip relief angle has an angle of 13 °, the second drill tip relief angle has an angle of 25 °, the first drill tip relief angle forms a first drill tip relief angle width on the primary cutting land, and the first drill tip relief angle width is 0.2-0.25 mm.

Preferably, two sides of the flank face form an auxiliary flank face along the edge of the drill cutter slot, and the width of the auxiliary flank face is 2.5 mm; one side of the secondary cutting edge, which is close to the secondary rear tool face, forms a secondary cutting edge zone, and the width of the secondary cutting edge zone is 0.12-0.15 mm; the surface of the secondary cutting edge is provided with a secondary rake angle, and the angle of the secondary rake angle is 8-10 degrees.

Preferably, the reamer knife groove is divided into a reamer straight groove and a reamer taper groove, the reamer straight groove is located in the reamer part, the joint of the reamer straight groove and the reamer taper groove is located in the first chamfer part, the reamer taper groove and the first chamfer part do not interfere with each other, and the taper of the reamer taper groove increases from front to back.

Preferably, the reamer cutting edge is provided with a reamer cutting edge zone and a reamer cutting edge cylindrical edge zone in sequence in a clockwise extending mode, the width of the reamer cutting edge zone is 0.1-0.12mm, and the total width of the reamer cutting edge cylindrical edge zone and the reamer cutting edge zone is 0.45-0.55 mm;

the surface of the cylindrical cutting edge of the reamer is provided with an external cylindrical back angle which is 18 degrees.

Preferably, the drill bit part further comprises a cutter core, the cutter core is provided with a cutter core taper, and the cutter core taper is increased from front to back.

Preferably, the diameter of the drill bit part is 2.95mm, and the length of the drill bit part is 5 mm; the diameter of the space avoiding part is 2.85mm, and the length of the space avoiding part is 1 mm; the diameter of the reamer part is 3mm, and the length of the reamer part is 8.0 mm; the diameter of the tool shank part is 4mm, and the length of the tool shank part is 36 mm;

the chamfer angle of the chamfer edge is 60 degrees, and the chamfer angle of the reverse chamfer edge is 45 degrees.

Compared with the prior art, the technical scheme has the following beneficial effects: the utility model improves the machining process, integrates the functions of the drill bit and the reamer on one cutter, adopts the process connection of drilling at the front head, reaming at the middle and chamfering at the tail, shortens the working procedure, simplifies the flow, saves the time for clamping and changing the cutter, and improves the machining efficiency; and the cutter body is formed once, which is favorable for ensuring the coaxiality of two times of hole processing, and the adjustment of the cutter setting is also easier, so that the processing precision can be improved, and the roughness requirement after the surface of the workpiece is processed is ensured.

Drawings

FIG. 1 is a schematic structural view of a high efficiency drilling reamer of the present invention;

FIG. 2 is a simplified schematic diagram of the high efficiency drill reamer of the present invention;

FIG. 3 is an enlarged partial view of the bit portion of the high efficiency drilling reamer of the present invention;

FIG. 4 is a schematic right-side view of FIG. 1;

FIG. 5 is a schematic cross-sectional view A-A of FIG. 1;

FIG. 6 is a schematic cross-sectional view B-B of FIG. 1;

in the drawings: drill bit part 1, clearance part 2, reamer part 3, shank part 4, drill bit cutting edge 11, drill bit flute 12, flank 13, chisel edge 14, feed edge 15, chip breaker 16, core 17, reamer cutting edge 31, reamer flute 32, first chamfer 41, second chamfer 42, main cutting edge 111, secondary cutting edge 112, drill point 113, rake face 121, secondary flank 131, reamer cutting land 311, reamer cutting edge cylindrical land 312, reamer straight groove 321, reamer tapered groove 322, main cutting land 101, diameter h of drill bit part₁Length l of the drill bit₁Diameter h of the void-avoiding portion₂Length l of the space-avoiding portion₂Diameter h of reamer part₃Length l of reamer part₃Diameter h of the shank₄Length l of the blade shank₄Length w of chisel edge₁Width w of first relief angle of drill tip₂Width w of the minor flank face₃Width w of the secondary cutting edge land₄Width w of the cutting edge zone of the reamer₅Total width w of reamer cutting edge cylindrical land and reamer cutting land₆The cutting tool comprises a top angle a, a chisel edge angle b, a tool feeding angle c, a first drill point rear angle d, a second drill point rear angle e, a secondary front angle f, an excircle rear angle g, an angle i of a chamfer edge and an angle j of a reverse chamfer edge.

Detailed Description

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-6, a high-efficiency drilling reamer comprises a drilling reamer base body, wherein the drilling reamer base body comprises a drilling head part 1, a clearance part 2, a reamer part 3 and a cutter handle part 4, the drilling head part 1, the clearance part 2, the reamer part 3 and the cutter handle part 4 are integrally formed and are sequentially arranged on the drilling reamer base body from front to back, and the diameters and the lengths of the drilling head part 1, the clearance part 2, the reamer part 3 and the cutter handle part 4 are different;

two drill bit cutting edges 11 spirally extending backwards along the axial direction are arranged on the periphery of the drill bit part 1, a drill bit cutter groove 12 is arranged between the adjacent drill bit cutting edges 11, the initial end of the drill bit cutter groove 12 starts from the head end of the drill reamer substrate, and the tail end of the drill bit cutter groove 12 is positioned in the clearance part 2;

six reamer cutting edges 31 extending backwards along the axial direction are formed in the periphery of the reamer part 3, a reamer cutter groove 32 is formed between every two adjacent reamer cutting edges 31, the initial end of the reamer cutter groove 32 is located at the clearance part 2, and the tail end of the reamer cutter groove 32 is located at the cutter handle part 4;

the positions of the drill bit slots 12 and the reamer slots 32 on the evacuation portion 2 do not interfere with each other and overlap each other; the start end of the shank portion 4 is provided with a first chamfer portion 41 provided with a chamfer cutting edge 411, the end of the shank portion 4 is provided with a second chamfer portion 42 provided with a reverse chamfer cutting edge 421.

The drilling reamer can be used for directly drilling through the drill bit cutting edge 11 and then reaming through the reamer cutting edge 31 in the situation without a prefabricated hole, and the clearance part 2 is arranged at the joint of the drill bit cutter groove 12 and the reamer cutter groove 32, so that cutting chips generated by drilling of the drill bit part 1 are effectively prevented from being wound on the reamer part 3, the possibility of cutter collapse caused by the winding of the cutting chips is greatly reduced, the roughness requirement after the surface of a workpiece is machined can be ensured, in addition, chamfering can be carried out on the workpiece through the chamfering edge 411, the reverse chamfering edge can meet the fixture requirement of a client, and the practical performance of the drilling reamer is improved.

The utility model improves the machining process, integrates the functions of the drill bit and the reamer on one cutter, adopts the process connection of drilling at the front head, reaming at the middle and chamfering at the tail, shortens the working procedure, simplifies the flow, saves the time for clamping and changing the cutter, and improves the machining efficiency; and the cutter body is formed once, which is favorable for ensuring the coaxiality of two times of hole processing, and the adjustment of the cutter setting is also easier, so that the processing precision can be improved, and the roughness requirement after the surface of the workpiece is processed is ensured.

Stated further, the drill cutting edge 11 includes a main cutting edge 111 and a minor cutting edge 112;

the front end of the drill tip 12 is a tapered rake face 121, the end face of the drill bit 1 is provided with two tapered flank faces 13, the main cutting edge 111 is the intersection line of the flank faces 13 and the rake face 121, the main cutting edge 112 forms the secondary cutting edge 112 along the edge of the drill tip 12, the intersection point of the main cutting edge 111 and the secondary cutting edge 112 forms a drill tip 113, the intersection line of the two flank faces 13 forms a chisel edge 14, and a cutting edge 15 is arranged between the main cutting edge 111 and the chisel edge 14.

The conical front tool surface 121 forms a guiding function for the drill cutter groove 12, and is favorable for smooth backward discharge of cutting chips generated by drilling of the drill bit part 1; the main cutting edge 111 and the auxiliary cutting edge 112 are used for continuously cutting a drilled hole without breaking, and the drill tip 113 is beneficial to ensuring a feed path during machining; in addition, due to the existence of the chisel edge 14, the general drill cannot be positioned when drilling a workpiece, the drill is easy to swing at the initial cutting stage, and the position of the drilled hole is deviated, so that the cutting edge 15 is arranged between the main cutting edge 111 and the chisel edge 14, and the conical rear cutter surface 13 is added, so that the accurate positioning of the drilling is ensured, meanwhile, the resistance of the chisel edge 14 can be reduced by the cutting edge 15, and the breakage and damage of the drill head 1 caused by a large load are avoided.

Stated further, the top angle a of the drill bit part 1 is 118 °; the length w1 of the chisel edge 14 is 0.12-0.18mm, the chisel edge 14 is provided with a chisel edge angle b, and the chisel edge angle b is 58 degrees; the knife feeding edge 15 is provided with a knife feeding angle c, and the knife feeding angle c is 30 degrees. The chisel edge 14 and the cutting edge 15 with the angle design can better ensure the accurate positioning of the drilling hole.

More specifically, a main cutting land 101 is provided on a side of the main cutting edge 111 close to the flank surface 13, a chip breaker 16 is provided on the main cutting land 101, a radius of the chip breaker 16 is 0.2mm, an axial relief angle of the chip breaker 16 is 13 °, and a radial relief angle of the chip breaker is 12 °. The chip breaker groove 16 breaks cutting chips generated by the drilling of the drill bit part 1, further ensures that the cutting chips are smoothly discharged, cannot be wound on a workpiece or a reamer part, can effectively reduce cutting resistance, can prevent the influence of cutting vibration on surface quality, and reduces the generation of vibration lines.

Stated further, the end of the primary cutting land 101 and the drill tip 113 form a first drill tip clearance angle d and a second drill tip clearance angle e, the first drill tip clearance angle d has an angle of 13 °, the second drill tip clearance angle e has an angle of 25 °, the first drill tip clearance angle d forms a first drill tip clearance angle width w2 on the primary cutting land 101, and the first drill tip clearance angle width w2 is 0.2-0.25 mm. The design of the angle and the width of the drill point 113 ensures that the grinding process of the drill bit part 1 is uniform during drilling, and the grinding precision is improved.

To explain further, the two sides of the flank surface 13 form a secondary flank surface 131 along the edge of the drill tip 12, and the width w3 of the secondary flank surface 131 is 2.5 mm; a secondary cutting edge 102 is formed on one side of the secondary cutting edge 112 close to the secondary flank 131, and the width w4 of the secondary cutting edge 102 is 0.12-0.15 mm; the surface of the secondary cutting edge 112 is provided with a secondary rake angle f, and the angle of the secondary rake angle f is 8-10 degrees.

The auxiliary cutting land 112 extends along the spiral direction width of the drill bit slot 12 to form the auxiliary cutting land 102, the auxiliary cutting land 112 has an extrusion effect on the hole wall, so that the auxiliary cutting edge 112 has a guiding effect in the drill bit machining process, the quality of the machined surface is improved, the auxiliary cutting land 102 and the auxiliary rake angle f are limited, the breakage of the auxiliary cutting edge 112 can be effectively prevented, and the service life of the drill bit part 1 is prolonged.

In a further description, the reamer grooves 3 are divided into a reamer straight groove 321 and a reamer taper groove 322, the reamer straight groove 321 is located in the reamer part 3, the junction of the reamer straight groove 321 and the reamer taper groove 322 is located in the first chamfer part 41, the reamer taper groove 322 and the first chamfer part 41 do not interfere with each other, and the taper of the reamer taper groove 322 increases from front to back. When the chamfering edge 411 of the first chamfer portion 41 chamfers the workpiece, the chamfer chips generated are guided by the reamer taper groove 322 whose taper increases from the front to the rear to spread to the outer periphery of the holder portion 4, thereby preventing the chips from being entangled.

Further, the reamer cutting edge 31 is provided with a reamer cutting edge zone 311 and a reamer cutting edge cylindrical edge zone 312 in a clockwise extending manner, the width w5 of the reamer cutting edge zone 311 is 0.1-0.12mm, and the total width w6 of the reamer cutting edge cylindrical edge zone 312 and the reamer cutting edge zone 311 is 0.45-0.55 mm; the surface of the reamer cutting edge cylindrical land 312 is provided with an outer circle relief angle g, which is 18 °.

The outer circle back angle g is the connection drop between the reamer cutting edge 311 and the reamer cutting edge cylindrical edge 312, and the formation of the outer circle back angle g can reduce the cutting force, protect the reamer cutting edge 31, reduce the abrasion of the cutter and prolong the service life of the cutter. Preferably, the cylindrical relief angle is 18 °.

In a further description, the drill bit portion 1 further includes a cutter core 17, and the cutter core 17 is provided with a cutter core taper, and the cutter core taper increases from front to back. The cutter core 17 is gradually enlarged to enhance the rigidity of the drill bit part 1, and vibration in the machining process is effectively reduced, so that the drilling precision of the drill bit part is ensured. Preferably, the taper of the knife core is 0-0.04 degrees.

Stated further, the diameter h1 of the drill bit part 1 is 2.95mm, and the length l1 of the drill bit part 1 is 5 mm; the diameter h2 of the evasion part 2 is 2.85mm, and the length l2 of the evasion part 2 is 1 mm; the diameter h3 of the reamer part 3 is 3mm, and the length l3 of the reamer part 3 is 8.0 mm; the diameter h4 of the handle part 4 is 4mm, and the length l4 of the handle part 4 is 36 mm; the chamfer angle i of the chamfer edge 411 is 60 °, and the chamfer angle j of the reverse chamfer edge 421 is 45 °.

The drill bit part 1 is used for improving the accuracy of drilling, preventing the reamer part 3 from deflecting when entering a workpiece, and ensuring the accuracy of drilling so as to effectively improve the quality of holes; secondly, through keeping away empty portion 2 and linking drilling head portion 1 and reamer portion 3, and the two is independent each other, and drill bit sword groove 12 and reamer sword groove 32 can not interfere, reach the chip removal requirement. The length and the diameter of the clearance part 2 are not too large, the length of the whole drilling reamer can be increased, the length cannot be too small, and the interference between the drill cutter groove 12 and the reamer cutter groove 32 can be caused, so the parameter setting of the clearance part is between the drill bit part 1 and the reamer part 3; reamer portion mainly accomplishes reaming and reaming, needs great intensity, and consequently reamer portion 3's parameter setting is bigger than drill bit portion 1 and clearance portion 2, strengthens reamer portion 3's intensity, increases the shock resistance of cutter, reduces the production of shake line. The structure and parameters of each part are limited and set, so that the cutter body cannot be overlong, the coaxiality of two times of hole processing is guaranteed, the cutter setting is adjusted more effectively and easily, the processing precision can be improved, the roughness requirement after the surface of a workpiece is processed is guaranteed, and the drilling reamer designed according to the parameters has good drilling and reaming performances.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the utility model and should not be construed in any way as limiting the scope of the utility model. Other embodiments of the utility model will occur to those skilled in the art without the exercise of inventive faculty based on the explanations herein, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined in the appended claims.

Claims

1. The utility model provides a high-efficient drilling reamer, includes drilling reamer base body, its characterized in that: the drilling reamer base body comprises a drilling head part, a clearance part, a reamer part and a cutter handle part, wherein the drilling head part, the clearance part, the reamer part and the cutter handle part are integrally formed and are sequentially arranged on the drilling reamer base body from front to back, and the diameters and the lengths of the drilling head part, the clearance part, the reamer part and the cutter handle part are different;

2. The efficient drilling reamer of claim 1 wherein: the drill cutting edges comprise a main cutting edge and a secondary cutting edge;

3. The high efficiency drilling reamer of claim 2 wherein the point angle of the bit portion is 118 °; the length of the chisel edge is 0.12-0.18mm, the chisel edge is provided with a chisel edge angle, and the chisel edge angle is 58 degrees; the knife feeding edge is provided with a knife feeding angle which is 30 degrees.

4. The efficient drilling reamer as claimed in claim 2, wherein a main cutting land is provided on a side of the main cutting edge close to the flank surface, a chip breaker is provided on the main cutting land, the radius of the chip breaker is 0.2mm, the axial relief angle of the chip breaker is 13 °, and the radial relief angle of the chip breaker is 12 °.

5. The high efficiency drilling reamer of claim 4 wherein the end of the primary cutting land forms a first tip clearance angle and a second tip clearance angle with the drill tip, the first tip clearance angle being at an angle of 13 ° and the second tip clearance angle being at an angle of 25 °, the first tip clearance angle forming a first tip clearance width on the primary cutting land, the first tip clearance width being 0.2-0.25 mm.

6. The high efficiency drilling reamer of claim 2 wherein the two sides of the relief surface form secondary relief surfaces along the edges of the bit flutes, the secondary relief surfaces having a width of 2.5 mm; one side of the secondary cutting edge, which is close to the secondary rear tool face, forms a secondary cutting edge zone, and the width of the secondary cutting edge zone is 0.12-0.15 mm; the surface of the secondary cutting edge is provided with a secondary rake angle, and the angle of the secondary rake angle is 8-10 degrees.

7. The efficient drilling reamer as claimed in claim 1, wherein the reamer flutes are divided into a reamer straight flute and a reamer taper flute, the reamer straight flute is located at the reamer portion, the junction of the reamer straight flute and the reamer taper flute is located at the first chamfer portion, the reamer taper flute and the first chamfer portion do not interfere with each other, and the taper of the reamer taper flute increases from front to back.

8. The efficient drilling reamer of claim 1, wherein the reamer cutting edge is provided with a reamer cutting land and a reamer cutting edge cylindrical land in a clockwise extending manner, the width of the reamer cutting land is 0.1-0.12mm, and the total width of the reamer cutting edge cylindrical land and the reamer cutting land is 0.45-0.55 mm;

9. The high efficiency drilling reamer of claim 1 wherein the bit portion further comprises a core having a core taper, the core taper increasing from front to back.

10. The efficient drilling reamer of claim 1 wherein the bit portion has a diameter of 2.95mm and a length of 5 mm; the diameter of the space avoiding part is 2.85mm, and the length of the space avoiding part is 1 mm; the diameter of the reamer part is 3mm, and the length of the reamer part is 8.0 mm; the diameter of the tool shank part is 4mm, and the length of the tool shank part is 36 mm;