CN111872460B

CN111872460B - Micro-milling cutter with intermittent micro-blade

Info

Publication number: CN111872460B
Application number: CN202010826774.5A
Authority: CN
Inventors: 朱洪涛; 姚阳; 王国宁; 黄传真; 张璞; 朱力敏; 张电丛; 姚鹏; 周如好; 唐宏亮; 王利峰
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2024-11-29
Anticipated expiration: 2040-08-17
Also published as: CN111872460A

Abstract

The present invention relates to the technical field of mechanical processing micro-cutting tools, and in particular to a micro-milling tool. It is composed of a tool body and a tooth, the tooth part is a spiral double-edged structure, and the helix angle is 30°; micro-groove arrays are respectively processed on the back surface of the side edges of the two teeth and the adjacent positions of the cutting edge, and the micro-grooves divide the continuous cutting edge of the micro-milling tool into discontinuous "micro-blades"; the micro-groove arrays of the two teeth are staggered with each other, and the relative positions in space are staggered by 50%. The presence of the micro-grooves makes the cutting edge distributed with a series of micro-blades with large blade inclination angles, the blunt radius of the micro-blade is reduced, the plowing effect is reduced, and it is easier to form chips, which effectively improves the stability of the micro-cutting process. The design of the staggered distribution of the micro-grooves of the two teeth reduces the cutting force while ensuring that the cutting edges of the two teeth can complete the cutting processing of the same processing surface, ensuring the processing accuracy, so that the micro-milling cutter can achieve a small amount of material removal while maintaining good rigidity.

Description

Micro-milling cutter with intermittent micro-blade

1. Technical field

The invention relates to the technical field of machining micro cutting tools, in particular to a discontinuous micro-blade micro milling tool.

2. Background art

Micro milling is a machining method for manufacturing micro parts and micro structures. However, the diameter of the micro milling cutter is small, the rigidity is weak, and the minimum thickness of the cutting chips formed by cutting is limited by the radius of the blunt circle of the cutting edge of the micro milling cutter. In addition, micro-material removal is generally required in micro-milling, but due to the restriction of the rounded radius of the cutting edge of the milling cutter, chips cannot be stably formed in the micro-material removal process, and the extrusion or plough of a cutting area is serious, so that the defects of increased cutting force, increased cutting specific energy, increased vibration, deteriorated processing surface quality and the like are caused. The existing micro milling cutter has the defects, so that the processing quality and the production efficiency of micro milling processing are affected.

3. Summary of the invention

The invention aims to provide the intermittent micro-blade micro-milling cutter with excellent cutting performance, which is capable of reducing cutting force by increasing the blade inclination angle and changing a continuous cutting blade into an intermittent micro-blade by utilizing a rear cutter surface micro-groove so as to overcome the defects that the rigidity of the conventional micro-milling cutter is poor, the thickness of undeformed chips is close to the radius of a cutter blade rounding circle, the cutting process is unstable, burrs are more generated and the quality of a processing surface is poor.

The technical scheme of the invention is that the cutter comprises a cutter body and cutter teeth, wherein the cutter teeth are in a spiral double-edge structure, the spiral angle is 30 degrees, micro-groove arrays are respectively processed at the positions adjacent to the rear cutter surfaces and the cutting edges of the cutter side edges of the two cutter teeth, the micro-grooves divide the continuous cutting edges of the micro-milling cutter into intermittent micro-edges, the micro-groove arrays of the two cutter teeth are mutually staggered, and the space relative positions of the micro-groove arrays of the two cutter teeth are staggered by 50%.

The length S of the micro groove array is 0.3 mm-1.2 mm, the length L of the micro groove is 50-200 mu m, the width W of the micro groove is 10-40 mu m, the distance D between adjacent micro grooves is 15-60 mu m, and the adjacent micro grooves are uniformly distributed on the rear surface of the cutter tooth side edge to form the micro groove array, wherein the parameters are selected according to the diameter phi of the micro milling cutter, S=0.6 phi, L=0.1 phi, W=0.02 phi and D=0.03 phi.

The invention has the mechanism that in the partial cutting participated by a single micro-blade, the inclination angle lambda s' of the micro-blade is increased compared with the inclination angle lambda s of the prior blade, the rounded radius of the normal blade is reduced compared with the rounded radius of the prior blade, the critical chip thickness is reduced, the cutting of thinner metal can be realized, the stability of micro-milling is also improved, the micro-grooves of the rear cutting surfaces of two teeth change the continuous cutting blade into intermittent micro-blades, the actual cutting width is reduced, the cutting force is reduced, the rigidity of the micro-milling cutter is improved, the micro-groove arrays are distributed in a staggered manner, the overlapping rate of 50% is arranged at the space relative position, the cutting machining of the same machining surface can be completed by the two-tooth cutting blade, and the machining precision is ensured.

The micro-groove cutting tool has the beneficial effects that a series of micro-blades with larger blade inclination angles are distributed on the cutting blades due to the existence of the micro-grooves, the radius of the blunt circle of the cutting edges of the micro-blades is reduced, the action of a plough is reduced, chips are easier to form, and the stability of the micro-cutting process is effectively improved. The design of staggered distribution of the micro grooves of the two cutter teeth ensures that the cutting edges of the two cutter teeth can finish the cutting processing of the same processing surface while reducing the cutting force, and ensures the processing precision. The micro-milling cutter can realize the micro-removal of the material on the premise of keeping good rigidity.

4. Description of the drawings

Fig. 1 is a schematic view of the structure of a cutter tooth 1;

Fig. 2 is a schematic structural view of the cutter tooth 2;

Fig. 3 is an enlarged schematic diagram of the staggered distribution of the micro grooves of the cutter teeth 1 and 2.

Reference numerals:

1. Cutter teeth 1 1-1, micro-groove arrays 1-2 on cutter teeth 1, micro-grooves 2 on cutter teeth 1, cutter teeth 2, 2-1, micro-grooves on cutter teeth 2 of micro-groove arrays 2-2 on cutter teeth 2.

5. Detailed description of the preferred embodiments

The specific embodiment of the invention is described in detail with reference to the accompanying drawings, wherein the micro milling cutter adopts a common double-blade milling cutter, the cutter body and the cutting part are of an integral structure, and the micro milling cutter is made of a super-fine grain hard alloy cutter material.

The invention is composed of a cutter body and cutter teeth, wherein the cutter teeth are in a spiral double-edge structure and composed of cutter teeth 1 and cutter teeth 2, the spiral angle is 30 degrees, a micro-groove array 1-1 and a micro-groove array 2-1 are arranged at the position adjacent to the cutting edge of the rear cutter face of the side edge of the cutter teeth 1 or 2, the micro-grooves divide the continuous cutting edge of the micro-milling cutter into intermittent micro-edges, the micro-groove arrays of the two teeth are distributed in a staggered mode, the space relative positions are staggered by 50%, the length S of the micro-groove array is 0.3 mm-1.2 mm, the micro-groove length L is 50-200 mu m, the micro-groove width W is 10-40 mu m, the distance D between the adjacent micro-grooves is 15-60 mu m, the micro-groove arrays are uniformly distributed on the rear cutter face of the side edge of the cutter teeth, and the parameters are selected according to the diameter of the micro-milling cutter.

Example 1 production of interrupted micro-blade micro-milling cutter with diameter phi of 1.0mm

When the diameter phi of the discontinuous micro-blade micro-milling cutter is 1.0mm, micro-groove arrays 1-1 and 2-1 are respectively arranged on the rear cutter surfaces of the side blades of the cutter tooth 1 and the cutter tooth 2 and adjacent to the cutting edges, and each parameter of the micro-groove is selected according to the diameter phi of the micro-milling cutter:

The parameters of the micro groove array length s=0.6Φ=0.6x1.0=0.6mm, the micro groove length l=0.1Φ=0.1x1.0=0.1mm=100 μm, the micro groove width w=0.02Φ=0.02 x1.0=0.02 mm=20 μm, the adjacent micro groove pitch d=0.03 Φ=0.03 x1.0=0.03 mm=30 μm were obtained by calculating the micro groove array length S, the adjacent micro groove pitch D from the micro groove array length S, the micro groove width w=0.02 Φ=0.02 x 1.0=0.02 mm=20 μm The number of micro grooves on a single cutter tooth is 20.

The existence of the micro grooves enables the cutting edge to be distributed with a series of micro edges with larger edge inclination angles, compared with the original cutting edge, the cutting edge rounding radius of the micro edges is reduced, the action of a plough is reduced, chips are easier to form, the design of staggered distribution of the micro grooves of the two cutter teeth effectively improves the stability of the micro cutting process, and the cutting force is reduced, meanwhile, the cutting edge of the two cutter teeth can finish the cutting processing of the same processing surface, and the processing precision is ensured. The micro-milling cutter can realize the micro-removal of the material on the premise of keeping good rigidity.

Example 2 production of interrupted micro-blade micro-milling cutter with diameter phi of 0.8mm

When the diameter phi of the discontinuous micro-blade micro-milling cutter is 0.8mm, micro-groove arrays 1-1 and 2-1 are respectively arranged on the rear cutter surfaces of the side blades of the cutter tooth 1 and the cutter tooth 2 and adjacent to the cutting edges, and each parameter of the micro-groove is selected according to the diameter phi of the micro-milling cutter:

The parameters of the micro groove array length s=0.6Φ=0.6x0.8=0.48 mm, the micro groove length l=0.1Φ=0.1x0.8=0.08 mm=80 μm, the micro groove width w=0.02Φ=0.02 x0.8=0.016 mm=16 μm, the adjacent micro groove pitch d=0.03 Φ=0.03 x0.8=0.024 mm=24 μm were obtained by calculating the micro groove array length S, the adjacent micro groove pitch D from the micro groove array length S, the micro groove width w=0.02 Φ=0.02 x 0.8=0.016 mm=16 μm The number of micro grooves on a single cutter tooth is 20.

The existence of the micro grooves enables the cutting edge to be distributed with a series of micro edges with larger edge inclination angles, compared with the original cutting edge, the radius of the edge rounding circle of the micro edges is reduced, the action of the plough is reduced, chips are easier to form, and the stability of the micro cutting process is effectively improved. The design of staggered distribution of the micro grooves of the two cutter teeth ensures that the cutting edges of the two cutter teeth can finish the cutting processing of the same processing surface while reducing the cutting force, and ensures the processing precision. The micro-milling cutter can realize the micro-removal of the material on the premise of keeping good rigidity.

Example 3 production of interrupted micro-blade micro-milling cutter with diameter phi of 0.5mm

When the diameter phi of the discontinuous micro-blade micro-milling cutter is 0.5mm, micro-groove arrays 1-1 and 2-1 are respectively arranged on the rear cutter surfaces of the side blades of the cutter tooth 1 and the cutter tooth 2 and adjacent to the cutting edges, and each parameter of the micro-groove is selected according to the diameter phi of the micro-milling cutter:

the parameters of the micro groove array length s=0.6Φ=10.6x0.5=0.3 mm, the micro groove length l=0.1Φ=0.1 x 0.5=0.05 mm=50 μm, the micro groove width w=0.02Φ=0.02 x 0.5=0.010 mm=10 μm, the adjacent micro groove pitch d=0.03Φ=0.03 x 0.5=0.015 mm=15 μm were obtained by calculating the micro groove array length S, the adjacent micro groove pitch D from s=0.6Φ=0.6x0.5=0.05mm=50 μm, the adjacent micro groove pitch D was calculated as s=0.02 x 0.5=0.010 mm=10 μm The number of micro grooves on a single cutter tooth is 20.

Claims

1. An intermittent micro-blade micro-milling tool, which is composed of a tool body and a tool tooth, wherein the tool tooth part is a spiral double-blade structure with a spiral angle of 30°, and is characterized in that micro-groove arrays are respectively processed at the positions adjacent to the cutting edge and the back face of the two tool teeth, and the micro-grooves divide the continuous cutting edge of the micro-milling tool into intermittent "micro-blades"; the micro-groove arrays of the two tool teeth are staggered with each other, and the relative spatial positions are staggered by 50%;

The invention is characterized in that the length S of the microgroove array is 0.3mm-1.2mm, the microgroove length L is 50-200μm, the microgroove width W is 10-40μm, the spacing D between adjacent microgrooves is 15-60μm, and the microgroove array is uniformly distributed on the back face of the side edge of the cutter tooth to form a microgroove array. The above parameters are selected according to the diameter φ of the micro milling cutter: S=0.6φ, L=0.1φ, W=0.02φ, D=0.03φ.