CN102085577B - Cutter for processing piston ring groove - Google Patents

Abstract

The invention discloses a cutter for processing a piston ring groove. The cutter comprises a cutter body, wherein the upper surface of the front end of the cutter body is provided with a cutting part which is provided with a high front part and a low back part; the lower surface of the cutter body is totally or partially of a spiral tooth-shaped or wavy structure; the front part of the surface of the cutting part is provided with a chip breaking groove; the section of the chip breaking groove is of a rectangular shape along the front-back direction of the cutting part, and the vertex angle at the front end of the triangle is 6 degrees; the distance from the front end surface of the chip breaking groove to the cutting edge is 0.15 mm; the distance from the front to the back of the bottom of the chip breaking groove is 0.7 mm; and the distance from the left to the right of the bottom of the chip breaking groove is 1 mm. According to the invention, by changing the structure of the lower surface of the cutter body and additionally arranging the chip breaking groove on the upper surface of the cutting part, the cutter and a clamp can be clamped more firmly for sure, the use is convenient, and the axial adjusting precision of a blade is higher; and moreover, a workpiece surface is not easily scratched by metal chips, and the precision and surface quality of the processed workpiece are ensured.

Description

The cutter of machining piston annular groove

Technical field

The invention belongs to machining manufacturing technology field, relate in particular to a kind of cutter of machining piston annular groove.

Background technology

Piston is the heart of automobile engine, bears the mechanical load and the thermic load of alternation, is one of worst key components and parts of condition of work in the engine.The function of piston is to bear gas pressure, and passes to connecting rod through piston pin and order about crankshaft rotating.The groove of piston is called annular groove.Be used for ring installation, the effect of piston ring is sealing, prevents gas leakage and prevents that machine oil from getting into the combustion chamber.In case piston ring groove damages, piston ring elasticity weakens or excessive wear even inefficacy, all can cause piston seal not tight, causes oil leakage phenomenon then.Therefore, the processing of piston ring groove is very crucial.

Piston ring is installed in the piston ring groove, is greater than the thickness of piston ring with regard to the degree of depth that requires groove.At present, the cutter that is used for the machining piston annular groove generally adopts like Fig. 1～groove cutter shown in Figure 4, this kind cutter criteria of right and wrong cutter, and its cutting tip 2 materials are polycrystalline diamond (PCD), the material of cutter hub 1 is a carbide alloy.In the process of machining piston annular groove, the stability that keeps processing is crucial.Existing cutter is unsatisfactory aspect the steadiness of installing; Only lean on the pressing of jig and the positioning action of bolt to fix cutter, its steadiness can not reach the requirement that machine tool chief axis runs up, and cutter is easy to generate vibration; Influence processing effect, also greatly reduce machining accuracy.Meanwhile, produce a large amount of metal fillings in the process and often be wrapped on the workpiece, it is serious that workpiece is scratched phenomenon, badly influences processing effect and product quality.

Summary of the invention

The present invention is in order to solve weak point of the prior art, provides that a kind of stable installation property is good, the converted products precision high, the cutter of the measured machining piston annular groove of matter.

For solving the problems of the technologies described above; The present invention adopts following technical scheme: the cutter of machining piston annular groove; Comprise cutter hub, the low cutting tip in high back before cutter hub front end upper surface is provided with, all or part of of said cutter hub lower surface has spiral dentation or wavy structure.

Front portion, said cutting tip surface is provided with chip-breaker; Said chip-breaker cross sectional shape is along the triangle on the cutting tip fore-and-aft direction; The drift angle of this triangle front end is 6 °; The chip-breaker front end face is apart from cutting edge 0.15mm, the chip-breaker bottom by preceding to after distance be 0.7mm, the chip-breaker bottom is 1mm by left-to-right distance.

Adopt technique scheme, have following beneficial effect:

Because the cutter hub of this kind blade is the alloy material; Shape is provided with all or part of spiral dentation or wavy structure near cuboid at the cutter hub lower surface, and cutter hub is connected through thread or ripple glaze interlock with jig; Steadiness improves greatly; Thereby can guarantee that whole cutter runs up under the very high prerequisite of lathe rotating speed, can not produce the vibration cutting phenomenon, also improve machining accuracy simultaneously.The innovation of helical tooth structure can enlarge the scope of cutter shaft to toolsetting, and is more flexible.

The setting of the anterior chip-breaker structure in cutting tip surface; Under the drive that machine tool chief axis runs up, in the process, workpiece to be machined also has a synchronous high rotating speed; Chip-breaker just can reach the effect of chip breaking, and workpiece to be machined just is difficult for being scratched by the metal fillings of strip.The chip-breaker cross sectional shape is along the triangle on the cutting tip fore-and-aft direction; The drift angle of this triangle front end is 6 °, and the chip-breaker front end is apart from cutting edge 0.15mm, the chip-breaker bottom by preceding to after distance be 0.7mm; The chip-breaker bottom is 1mm by left-to-right distance; The concrete setting of this structure and size is not only according to the structure of cutting tip itself and is improved, and more is aimed at the operations of machining high-precision, high-quality piston ring groove.

The present invention is through changing the structure of cutter hub lower surface; And at cutting tip upper surface increase chip-breaker; Not only guarantee the clamping that cutter and anchor clamps can be more firm, easy to use, can make the axial adjustment precision of blade higher; And make metal fillings be difficult for scratching surface of the work, guarantee the precision and the surface quality of workpiece to be machined.

Description of drawings

Fig. 1 is the prior art constructions sketch map;

Fig. 2 is the upward view of Fig. 1;

Fig. 3 is the enlarged drawing at A place in the middle of Fig. 1;

Fig. 4 is a B-B cutaway view in the middle of Fig. 3;

Fig. 5 is a structural representation of the present invention;

Fig. 6 is the upward view of Fig. 5;

Fig. 7 is the enlarged drawing at C place in the middle of Fig. 5;

Fig. 8 is a D-D cutaway view in the middle of Fig. 7.

The specific embodiment

Like Fig. 5～shown in Figure 8; The cutter of machining piston annular groove of the present invention comprises cutter hub 1, the low cutting tip 2 in high back before cutter hub 1 front end upper surface is provided with; Cutting tip 2 front ends are provided with cutting edge 5, and all or part of of cutter hub 1 lower surface 3 has spiral dentation or wavy structure.Cutter hub 1 is connected through thread or ripple glaze interlock with jig; Steadiness improves greatly, thereby can guarantee that whole cutter runs up under the very high prerequisite of lathe rotating speed, can not produce the vibration cutting phenomenon; Also improved simultaneously machining accuracy; The innovation of helical tooth structure can enlarge the scope of the vertical toolsetting of cutter, and is more flexible.

Cutting tip 2 surperficial front portions are provided with chip-breaker 4; Chip-breaker 4 cross sectional shapes are along the triangle on cutting tip 2 fore-and-aft directions; The drift angle M of this triangle front end is 6 °; Between chip-breaker 4 front end faces and the cutting edge 5 is 0.15mm apart from N, chip-breaker 4 bottoms by preceding to after distance X be 0.7mm, chip-breaker 4 bottoms are 1mm by left-to-right distance Y.The setting of chip-breaker 4 structures, under the drive that machine tool chief axis runs up, in the process, cutter also has a synchronous high rotating speed, and chip-breaker 4 just can reach the effect of chip breaking, and workpiece to be machined just is difficult for being scratched by the metal fillings of strip.The concrete setting of the said structure of chip-breaker and size is not only according to cutting tip 2 structures own and is improved, and more is aimed at the operations of machining high-precision, high-quality piston ring groove.

Claims (1)

1. the cutter of machining piston annular groove comprises cutter hub, the low cutting tip in high back before cutter hub front end upper surface is provided with, and it is characterized in that: all or part of of said cutter hub lower surface has spiral dentation or wavy structure;

Front portion, said cutting tip surface is provided with chip-breaker; Said chip-breaker cross sectional shape is along the triangle on the cutting tip fore-and-aft direction; The drift angle of this triangle front end is 6 °; The chip-breaker front end face is apart from cutting edge 0.15mm, the chip-breaker bottom by preceding to after distance be 0.7mm, the chip-breaker bottom is 1mm by left-to-right distance.

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