CN100369704C

CN100369704C - Reversible holes turning insert

Info

Publication number: CN100369704C
Application number: CNB2005101366459A
Authority: CN
Inventors: 刘敏; 王社权; 张京; 马志强; 何志平
Original assignee: Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Current assignee: Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Priority date: 2005-12-27
Filing date: 2005-12-27
Publication date: 2008-02-20
Anticipated expiration: 2025-12-27
Also published as: CN1799736A

Abstract

The present invention provides a reversible turning blade for turning inner holes with high precision, which has a basic polygonal shape and comprises an upper surface, a lower surface and a plurality of groups of side walls, wherein the side walls and the upper surface are crossed to form blade cutting edges, and the upper surface forms a front cutter surface at the cutting edges. The present invention is characterized in that two adjacent side walls are connected by a conical surface to form a rear cutter surface; the upper surface, the side walls and a circular arc surface are crossed to form a cutting edge angle; the cutting edges are symmetrically distributed corresponding to the geometric bisector of the cutting edge angle and form a helical line shape, and the top edge is the highest; the center of the top of the cutting edge angle is provided with a groove and a chip cutting groove composed of a spherical lug boss positioned in the groove, wherein the tail part of the spherical lug boss is connected with the upper surface of the blade by a cylindrical surface of which the generatrix forms an included angle theta with the horizontal direction, the bottom of the groove is approximate to an ellipse shape and is level with the bottom of the cutter groove, and an included angle between the side wall and the axis direction of the blade is beta. The reversible turning blade of the present invention has the advantages of sharp cutter tip, controllable chip cutting direction and shape, and smooth chip discharge.

Description

Reversible holes turning insert

Technical field

The present invention relates to a kind of reversible holes turning insert, especially be applied to the Indexable cutting inserts of endoporus precision turning processing.

Background technology

The handling problem of the smear metal of endoporus turning is a great problem in the machining always, particularly when the workpiece of processing small-bore, the smear metal discharge that is difficult to fracture, be easy to be wrapped on workpiece and cutter, the anchor clamps, along with the continuation smear metal of processing is cumulative, so very easily scratching machined surface influences crudy, even beats and cause the blade tipping on blade.So the operator often will clear up smear metal adding to shut down man-hour midway in the processing of traditional endoporus, has had a strong impact on the crudy of working (machining) efficiency and workpiece like this.Especially the workpiece endoporus is carried out Precision Machining, the handling problem performance of smear metal is more outstanding.The smear metal curvature that cutting forms is too big, flowing of smear metal can't artificially be controlled or predict, smear metal also is difficult to fracture, its consequence is that smear metal is pushed mutually, bring feeling of risk to the operator, the damage machined surface causes product glossiness bad, even damages cutter and blade, particularly process some plasticity and viscosity preferably during material, for example stainless steel, alloy material, non-ferrous metal.Endoporus turning insert such as patent US005116167A, groove and boss are set in the basil plane of blade satisfy chip breaking under different cutting-ins and feeding situation, but it is big that the flute profile of this groove back-end closure adds man-hour cutting force, and the endoporus fine finishining of workpiece is had certain limitation.

Summary of the invention

At above-mentioned deficiency, the invention provides a kind of indexable turning insert that is used for the endoporus precision turning, point of a knife is sharp, and chip-flowing and shape are controlled, chip removal smoothly.

Reversible holes turning insert of the present invention, has polygonal basic configuration, comprise relative upper and lower surface and some groups of sidewalls that are connected both, sidewall and upper surface intersect formation blade cut sword, upper surface forms rake face at the cutting edge place, it is characterized in that: it is 5 °-15 ° back knife face that adjacent two side link to each other to form relief angle a by taper seat, and upper surface, sidewall and arc surface intersect to form and cut the basil; Described cutting edge is symmetrically distributed about the cutting basil how much bisectors, is the spatially spiral wire shaped, and the sword position, top that is positioned on how much bisectors of the cutting basil is the highest, with the maximum difference h of symmetrical side edge be 0.02-0.2mm; Cutting basil top center design groove and be positioned at the chip-breaker that the spherical boss of groove is formed; The front end of described spherical boss and the intersection point of groove are that c is 0.3mm-1.2mm to the horizontal range of top sword, the vertical range b of top and bottom portion of groove is 0.04-0.12mm, and afterbody is that 4 °-15 ° the face of cylinder links to each other with the upper surface of blade by bus and horizontal direction angle theta; Described bottom portion of groove contour approximation is oval and equal with the bottom of cutter groove, and recess sidewall and blade axis angular separation β are 19 °-21 °.

Described bottom portion of groove is 0.05-0.15mm apart from the vertical range d of top sword, and the radius of described spherical boss is 0.3-0.6mm.

Described angle β, θ value optimum are 20 °, 8 °.

As further improvement, reversible holes turning insert of the present invention, rake face comprise the major first face and second rake face, are respectively the first anterior angle γ, the second anterior angle δ with the angle of lower surface, and described γ is that 5 °-10 °, δ are 8 °-15 °; γ, δ are that optimum is 6 °, 10 °.

Cutting edge of the present invention is spatially spiral wire shaped and big relief angle, strengthen point of a knife sharpness, avoid adding the interference of man-hour and workpiece; The chip-breaker of forming by groove and spherical boss, even the material that difficult processing rapidoprint, plasticity and viscosity are stronger, also the flowing, curl and fracture of directs chips effectively, make endoporus add the smear metal that produces man-hour and flow to a side of cutter regularly, and fracture into the smear metal of C shape and discharge smoothly.

Description of drawings

Fig. 1 is the stereogram of reversible holes turning insert triangular form of the present invention;

Fig. 2 is the amplification plan view of the cutting basil 6 of Fig. 1;

Fig. 3 is the K area planar expanded view that Fig. 2 cuts the basil 6;

Fig. 4 is a B-B cutaway view Amplified image among Fig. 2;

Fig. 5 is a C-C cutaway view Amplified image among Fig. 2.

Fig. 6 is the three-dimensional icon intention of Fig. 2.

Wherein: the 1-upper surface, the 2-lower surface, 3a, 3b-sidewall, the 4-cutting edge, 4a, 4b-side edge, 4c-top sword, the 5-arc surface, 6-cuts the basil, 7-groove, the spherical boss of 8-, 9-chip-breaker, 10-cutter groove, 11-major first face, 12-second rake face, the 13-face of cylinder.

The specific embodiment

The present invention is further elaborated below in conjunction with accompanying drawing:

As Fig. 1-shown in Figure 6, reversible holes turning insert of the present invention, has polygonal basic configuration, as triangle, comprise relative upper and lower surperficial 1,2 with three groups of sidewalls 3 that are connected both, sidewall 3 intersects formation blade cut sword 4 with upper surface 1, and upper surface 1 forms rake face at cutting edge 4 places.Cutting edge 4 is symmetrically distributed about the cutting basil 6 how much bisectors, is the spatially spiral wire shaped, and the sword 4c position, top that is positioned on how much bisectors of the cutting basil is the highest, and with symmetrical side edge 4a, the maximum difference h of 4b is 0.02mm-0.2mm; Adjacent two

side

3a, 3b are 5 °-15 ° back knife face by taper seat 5 continuous formation relief angle a; Upper surface 1, sidewall 3 intersect the formation cutting basil 6 with arc surface 5; The chip-breaker 9 that the center design of the cutting basil 6 tops is made up of a groove 7 and spherical boss 8, the intersection point of the front end of spherical boss 8 and groove 7 is 0.3mm-1.2mm to the horizontal range c of top sword 4c, afterbody links to each other with the upper surface 1 of blade by the face of cylinder 13, the angle theta of the face of cylinder 13 buses and horizontal direction is 4 °-15 °, is preferably 8 °.Groove 7 bottom profile sub-ellipticals and equal with the bottom of cutter groove 10, apart from top sword 4c be 0.05mm-0.15mm apart from d, sidewall and blade axis angular separation β are 19 °-21 °, are preferably 20 °.

For making point of a knife sharp, the rake face design has two: the major first face 11 and second rake face 12, and the angle of they and lower surface 2 is respectively the first anterior angle γ, the second anterior angle δ, and its value γ is 5 °-10 °, and preferably 6 °, δ is 8 °-15 °, preferably 10 °.

Because cutting edge of the present invention is the spatially spiral wire shaped, as Fig. 3, make blade sharper, cut more brisk, the possibility of overlap generation in the time of reducing to cut; Big relief angle, strengthen point of a knife sharpness, avoid adding the interference of man-hour and workpiece; The chip-breaker of forming by groove and spherical boss, even the material that difficult processing rapidoprint, plasticity and viscosity are stronger, smear metal is flowed out by rake face when cutting, cell wall along groove 7 enters shaping in advance in the chip-breaker 9, the mobile intermediate portion of smear metal continuation is subjected to the effect of spherical boss 8 and is lifted, directs chips is moved along spherical boss nose circle cylinder 13, thereby directs chips flows to a side of cutter regularly effectively, and fracture into the smear metal of C shape and discharge smoothly, machining accuracy improves greatly; Chip-breaker can be accumulated a spot of cooling fluid cooling cutting edge simultaneously; Two rake face structure lands are sharp, bear bigger external pressure again, reduce the friction that smear metal produces when flowing.

Reversible holes turning insert of the present invention can seriation, can be installed on each class standard knife bar, and the endoporus in the small-bore adds and adopts carbide alloy man-hour, steel-bonded carbide, and effect is better during the damping knife bar.

Claims

1. reversible holes turning insert, has polygonal basic configuration, comprise relative upper and lower surface (1,2) and the some groups of sidewalls (3) that are connected both, sidewall and upper surface intersect formation blade cut sword (4), upper surface locates to form rake face at cutting edge (4), it is characterized in that: adjacent two side (3a, 3b) is 5 °-15 ° back knife face by the continuous formation of taper seat (5) relief angle a; Upper surface, sidewall and taper seat (5) intersect the formation cutting basil (6); Described cutting edge (4) is symmetrically distributed about the cutting basil (6) how much bisectors, is the spatially spiral wire shaped, and top sword (4c) position that is positioned on how much bisectors of the cutting basil is the highest, with the side edge of symmetry (4a, maximum difference h 4b) is 0.02-0.2mm; The cutting basil (6) top center design fluted (7) and be positioned at the chip-breaker (9) that the spherical boss (8) of groove (7) is formed; The intersection point of the front end of described spherical boss (8) and groove (7) is 0.3mm-1.2mm to the horizontal range c of top sword (4c), the vertical range b of top and groove (7) bottom is 0.04-0.12mm, and afterbody is that 4 °-15 ° the face of cylinder (13) links to each other with the upper surface (1) of blade by bus and horizontal direction angle theta; Described groove (7) bottom profile sub-elliptical and equal with the bottom of cutter groove (10), groove (7) sidewall and blade shaft are 19 °-21 ° to angular separation β.

2. reversible holes turning insert as claimed in claim 1 is characterized in that: described groove (7) bottom is 0.05-0.15mm apart from the vertical range d of top sword (4c); The radius of described spherical boss (8) is 0.3-0.6mm.

3. reversible holes turning insert as claimed in claim 2 is characterized in that: described angle β is 20 °, and the θ value is 8 °.

4. reversible holes turning insert as claimed in claim 1, it is characterized in that: described rake face comprises major first face (11) and second rake face (12), be respectively the first anterior angle γ, the second anterior angle δ with the angle of lower surface (2), described γ is that 5 °-10 °, δ are 8 °-15 °.

5. reversible holes turning insert as claimed in claim 4 is characterized in that: described γ is that 6 °, δ are 10 °.