CN212469933U

CN212469933U - T-shaped milling cutter for processing plastic

Info

Publication number: CN212469933U
Application number: CN202021068508.2U
Authority: CN
Inventors: 张波
Original assignee: CHANGZHOU CHUANGWEI TOOL MANUFACTURING CO LTD
Current assignee: CHANGZHOU CHUANGWEI TOOL MANUFACTURING CO LTD
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2021-02-05
Anticipated expiration: 2030-06-11

Abstract

The utility model discloses a T-shaped milling cutter for processing plastic, which comprises a neck part, a handle part connected with one end of the neck part and a cutting part connected with the other end of the handle part, wherein the handle part is provided with a central axis, one end of the cutting part, which is far away from the handle part, is provided with a first bottom surface cutting edge and a second bottom surface cutting edge, the first bottom surface cutting edge and the second bottom surface cutting edge are respectively positioned at two opposite sides of the central axis, the cutting surface of the first bottom surface cutting edge is higher than the cutting surface of the second bottom surface cutting edge, and the height difference is 0; one end of the blade part connecting handle part is provided with a first top surface cutting edge and a second top surface cutting edge, the first top surface cutting edge and the second top surface cutting edge are respectively positioned on two opposite sides of the central axis, the blade surface of the first top surface cutting edge is lower than the blade surface of the second top surface cutting edge, and the height difference is 0.03-0.05 mm; the first bottom surface cutting edge, the second bottom surface cutting edge of co-altitude reach first top surface cutting edge and second top surface cutting edge, offset the influence of plastic material resilience characteristic, reach the effect that improves the machined surface smoothness and improve the machining precision.

Description

T-shaped milling cutter for processing plastic

Technical Field

The utility model relates to a milling cutter technical field, more specifically say, it relates to a T type milling cutter for processing plastic.

Background

The existing T-shaped milling cutter is widely applied to the manufacturing of electronic product parts, along with the development of the industry, the requirements on the precision and the appearance of the parts are higher and higher, but the existing common T-shaped milling cutter is easy to have the conditions of over-tolerance in size and burrs at the edge in the processing process, and is particularly obvious when plastic parts are processed. Due to the limitation of the space of electronic products, the parts are soft in material, the processing precision is deviated due to the rebound phenomenon during processing, and burrs need to be removed through an additional process.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a T type milling cutter for processing plastic, it has the high and smooth characteristics of machined surface of machining precision.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a T-shaped milling cutter for processing plastic comprises a neck, a handle connected to one end of the neck and an edge part connected to the other end of the handle, wherein the handle is provided with a central axis, one end of the edge part, which is far away from the handle, is provided with a first bottom surface cutting edge and a second bottom surface cutting edge, the first bottom surface cutting edge and the second bottom surface cutting edge are respectively positioned on two opposite sides of the central axis, the cutting surface of the first bottom surface cutting edge is higher than the cutting surface of the second bottom surface cutting edge, and the height difference is 0.03-0.05 mm; the cutting part is connected stalk portion one end has first top surface cutting edge and second top surface cutting edge, first top surface cutting edge with second top surface cutting edge is located respectively the relative both sides of central axis, first top surface cutting edge plane is less than second top surface cutting edge plane, and the difference in height is 0.03-0.05 mm.

Through adopting above-mentioned technical scheme, set first bottom surface cutting edge and second bottom surface cutting edge into not co-altitude, make after first bottom surface cutting edge cuts the plastic part, can produce certain burr, and the characteristic of plastic material, its plastic part itself can produce and kick-backs, make in rotation process, when the cutting of second bottom surface cutting edge, even second bottom surface cutting edge facet is lower than first bottom surface cutting edge facet, according to the experiment, when the difference in height is between 0.03mm-0.55mm, second bottom surface cutting edge can carry out the secondary cutting with the plastic part surface burr that kick-backs, thereby reach the burring and improve the effect of precision.

Further, the cutting part side has first excircle cutting edge and second excircle cutting edge, first excircle cutting edge with second excircle cutting edge all is located keeps away from central axis one side, just first excircle cutting edge with second excircle cutting edge is located respectively the relative both sides of central axis, wherein the external diameter of first excircle cutting edge is greater than the external diameter of second excircle cutting edge, the external diameter difference is 0.2mm-0.3 mm.

Through adopting above-mentioned technical scheme, set up the cutting edge of different external diameters at the side, according to the resilience characteristic of plastic for after first excircle cutting edge cutting, the second cutting edge can carry out burring and secondary cutting to the machined surface that kick-backs.

Further, first excircle cutting edge with second excircle cutting edge all has and runs through axial both ends and is spiral helicine chip groove.

Further, the height of first excircle cutting edge is 1mm, the height of second excircle cutting edge is 0.94mm, the external diameter of first excircle cutting edge is 2mm, the external diameter of second excircle cutting edge is 1.8 mm.

Further, the helix angles of the first and second outer circular cutting edges are both 20 °.

Further, the rake angles of the first bottom surface cutting edge, the second bottom surface cutting edge, the first top surface cutting edge and the second top surface cutting edge are all 20 °, the relief angles are all 18 °, and the axial relief angles are all 10 °.

Further, the neck, the handle and the blade are integrally formed.

Further, the milling cutter is made of cemented carbide.

To sum up, the utility model discloses following beneficial effect has:

1. the first bottom surface cutting edge, the second bottom surface cutting edge and the first top surface cutting edge and the second top surface cutting edge with different heights are arranged, so that the influence of the rebound property of the plastic material is counteracted, and the effects of improving the surface smoothness of the processing surface and improving the processing precision are achieved;

2. through setting up the first excircle cutting edge and the second excircle cutting edge that the external diameter is inequality to reach the effect that improves the machining precision and the smoothness of each position of T type groove.

Drawings

Fig. 1 is a schematic view of an overall structure of a T-shaped milling cutter for processing plastic according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a connection portion between the blade and the neck according to an embodiment of the present invention.

In the figure: 1. a handle; 2. a neck portion; 3. a blade part; 31. a first bottom cutting edge; 32. a second bottom cutting edge; 33. a first top cutting edge; 34. a second top cutting edge; 35. a first outer cutting edge; 36. a second outside circular cutting edge.

Detailed Description

Example (b):

the present invention will be described in further detail with reference to the accompanying fig. 1-2.

A T-shaped milling cutter for processing plastic comprises a neck part 2, a handle part 1 connected with one end of the neck part 2 and an edge part 3 connected with the other end of the handle part 1, wherein the handle part 1 is provided with a central axis, the upper end of the handle part 1 is in a cylindrical shape, one end of the handle part 1 connected with the neck part 2 is in a conical shape, one end of the edge part 3 far away from the handle part 1 is provided with a first bottom surface cutting edge 31 and a second bottom surface cutting edge 32, the first bottom surface cutting edge 31 and the second bottom surface cutting edge 32 are respectively positioned at two opposite sides of the central axis, the first bottom surface cutting edge 31 and the second bottom surface cutting edge 32 form a T-shaped structure together with the neck part 2, in, the neck part 2, the handle part 1 and the edge part 3 are integrally formed, the edge surface of the first bottom surface cutting edge 31 is higher than the edge surface of the second bottom surface cutting edge 32, and the height difference of the two is 0.03-0.05mm after tests; by utilizing the resilience characteristic and the soft characteristic of the plastic material, the second bottom surface cutting edge 32 can perform secondary cutting on the cut processing surface, so that burrs are removed, the processing precision is improved after the secondary cutting, and in the embodiment, the height difference between the two is 0.03mm, so that the effect can be well achieved; the edge part 3 is connected with one end of the handle part 1 and is provided with a first top surface cutting edge 33 and a second top surface cutting edge 34, the first top surface cutting edge 33 and the second top surface cutting edge 34 are respectively positioned at two opposite sides of the central axis, the edge surface of the first top surface cutting edge 33 is lower than the edge surface of the second top surface cutting edge 34, and when the height difference between the two is 0.03-0.05mm through tests; by utilizing the plastic edge part 3, the side surface is provided with the first outer circular cutting edge 35 and the second outer circular cutting edge 36, the first outer circular cutting edge 35 and the second outer circular cutting edge 36 are both positioned at one side far away from the central axis, and the first outer circular cutting edge 35 and the second outer circular cutting edge 36 are respectively positioned at two opposite sides of the central axis, in the embodiment, the first bottom surface cutting edge 31 and the first outer circular cutting edge 35 are positioned at the same side of the central axis, the second bottom surface cutting edge 32 and the second outer circular cutting edge 36 are positioned at the same side of the central axis, the outer diameter of the first outer circular cutting edge 35 is larger than that of the second outer circular cutting edge 36, through tests, when the outer diameter difference between the first outer circular cutting edge 35 and the second outer circular cutting edge is 0.2-0.3mm, the inner side surface of the plastic part can be well secondarily cut, in the embodiment, the outer diameter difference is 0, due to the characteristics of resilience, soft material and the like of the plastic material, the machined surface has the phenomena of resilience, burrs and the like, and when the second outer circular cutting edge 36 is cut again, the surface burrs and the surface are cut for the second time, so that the smoothness and the precision of the machined surface are improved.

The first excircle cutting edge 35 and the second excircle cutting edge 36 both have a chip removal groove which runs through the axial two ends and is spiral, so that the chip removal can be rapidly carried out during cutting.

In this embodiment, the height of the first outer circular cutting edge 35 is 1mm, the height of the second outer circular cutting edge 36 is 0.94mm, the outer diameter of the first outer circular cutting edge 35 is 2mm, the outer diameter of the second outer circular cutting edge 36 is 1.8mm, the helix angles of the first outer circular cutting edge 35 and the second outer circular cutting edge 36 are both 20 °, the rake angles of the first bottom surface cutting edge 31, the second bottom surface cutting edge 32, the first top surface cutting edge 33 and the second top surface cutting edge 34 are both 20 °, the relief angles are both 18 °, and the axial relief angles are both 10 °.

The working principle is as follows:

when a plastic part is machined by the first outer circular cutting edge 35, the second outer circular cutting edge 36, the first bottom surface cutting edge 31, the second bottom surface cutting edge 32, the first top surface cutting edge 33 and the second top surface cutting edge 34, because the outer diameters of the first outer circular cutting edge 35 and the second outer circular cutting edge 36 are different, the height difference exists between the cutting edge surfaces of the first bottom surface cutting edge 31 and the second bottom surface cutting edge 32, and the height difference exists between the cutting edge surfaces of the first top surface cutting edge 33 and the second top surface cutting edge 34, after the cutting edge with a large machining amount is subjected to first round cutting, due to the rebound property and soft property of the plastic material, the plastic machining surface generates rebound phenomenon and generates burrs, and the second outer circular cutting edge 36, the second bottom surface cutting edge 32 and the second top surface cutting edge 34 with a small machining amount cut the machining surface again, so that the burrs are removed and cut again, the effect of improving the surface smoothness and precision of the plastic part is achieved.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it is understood that "first" and "second" are only used for convenience of expression and should not be understood as limitations to the embodiments of the present invention, and the following embodiments do not describe any more.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a T type milling cutter for processing plastic, includes a neck (2), connect in stalk portion (1) of neck (2) one end and connect in cutting part (3) of the stalk portion (1) other end, stalk portion (1) have a central axis, its characterized in that: the end, away from the handle part (1), of the edge part (3) is provided with a first bottom surface cutting edge (31) and a second bottom surface cutting edge (32), the first bottom surface cutting edge (31) and the second bottom surface cutting edge (32) are respectively positioned on two opposite sides of the central axis, the cutting surface of the first bottom surface cutting edge (31) is higher than the cutting surface of the second bottom surface cutting edge (32), and the height difference is 0.03-0.05 mm; the cutting part (3) is connected stalk portion (1) one end has first top surface cutting edge (33) and second top surface cutting edge (34), first top surface cutting edge (33) with second top surface cutting edge (34) are located respectively the relative both sides of central axis, first top surface cutting edge (33) flank is less than second top surface cutting edge (34) flank, and the difference in height is 0.03-0.05 mm.

2. The T-mill for machining plastics according to claim 1, wherein: the cutting part (3) side has first excircle cutting edge (35) and second excircle cutting edge (36), first excircle cutting edge (35) with second excircle cutting edge (36) all are located and keep away from central axis one side, just first excircle cutting edge (35) with second excircle cutting edge (36) are located respectively the relative both sides of central axis, wherein the external diameter of first excircle cutting edge (35) is greater than the external diameter of second excircle cutting edge (36), and the external diameter difference is 0.2mm-0.3 mm.

3. The T-mill for machining plastics according to claim 2, wherein: first excircle cutting edge (35) with second excircle cutting edge (36) all have and run through axial both ends and are spiral helicine chip groove.

4. The T-mill for machining plastics according to claim 2, wherein: the height of first excircle cutting edge (35) is 1mm, the height of second excircle cutting edge (36) is 0.94mm, the external diameter of first excircle cutting edge (35) is 2mm, the external diameter of second excircle cutting edge (36) is 1.8 mm.

5. The T-mill for machining plastics according to claim 2, wherein: the helix angles of the first outer circular cutting edge (35) and the second outer circular cutting edge (36) are both 20 °.

6. The T-mill for machining plastics according to claim 1, wherein: the rake angle of the first bottom surface cutting edge (31), the second bottom surface cutting edge (32), the first top surface cutting edge (33) and the second top surface cutting edge (34) is 20 °, the relief angle is 18 °, and the axial relief angle is 10 °.

7. The T-mill for machining plastics according to claim 1, wherein: the neck (2), the handle (1) and the blade (3) are integrally formed.

8. The T-mill for machining plastics according to claim 1, wherein: the milling cutter is made of cemented carbide.