SU1444086A1 - Method of kinematic breaking of chip on n/c machines - Google Patents

Abstract

The invention relates to the field of metal cutting and can be used in the kinematic crushing of chips on machine tools with numerical control. The aim of the invention is to improve the quality of the machined surface X by improving the dynamic characteristics of the cutting process and increasing the machining performance while maintaining the durability of the cutting tool. In addition to moving the contour of part 2 in direction S, cutter 1 reports additional movements initially along the SOT vector, which is an arc of a segment with a radius Ri tangent to the main feed vector and unidirectional to it. Then the cutter 1 is retracted along the vector S ;, representing the chord of the segment and directed at an angle from 10-20 to the vector Si in the opposite direction. Next, the cutter is moved along the vector 8tst, directed along the arc of the segment towards the main feed. 1 z.p, f-ly, 5 ill., 1 tab. i (L 4 4 4 O 00 O5

Description

Phys. 1

. 1444086

the invention relates to processing

from pr and 20 to on us

metal cutting and can be used for kinematic crushing chips on machine tools with numerical control.

The purpose of the invention is to improve the quality of the machined surface by improving the dynamic characteristics of the cutting process and noBbmie-Q machining performance while maintaining the durability of the cutting tool.

Fig. 1 shows a general scheme of moving the cutting tool at 15 but is brought to the part contour machined over machining; in fig. 2, providing a smoother pattern of additional displacements; selection of gaps in screw pairs; then the cutter at an accelerated feed is retracted along the vector S ,, (fig. 4), which is a segment chord and directed at an angle rx, 10-20 to the instantaneous vector of the main feed Si in the direction opposite to it, ensuring removal from the cutting surface and guaranteed chip breakage.

Next, the cutter along the vector Sm directed along the arc of the segment to the side of the main feed, t, e. along the arc supported by the indicated chord, they are smoothly guided to the surface being processed, providing a smoother selection of gaps in the screw pairs, and then the cutter at an accelerated feed is taken along the vector S ,, (FIG. 4), which is a chord of the segment and directed at an angle rx , 10 - 20 ° to the instantaneous vector of the main feed of Si in the direction opposite to it, ensuring removal from the cutting surface and guaranteed chip breakage.

Next, the cutter along the vector Sm directed along the arc of the segment to the side of the main feed, t, e. in an arc supported by the indicated chord

cutter along a segment of a circle providing chip interruption, FIG. 3 - retraction of the cutting tool from the surface to be machined along the arc of the segment by the amount of radial elastic deformations of the SEM and SSH-S, FIG. 4 - retraction of the tool from the cutting surface along the segment chord; Fig, 5 - supply cutter to the treated surface along the arc of a circle segment.

The method is carried out as follows.

Cutter 1 of a certain configuration, for example, through passage, in addition to DETZKENI feed along the contour of part 2

In the direction of S, additional displacements are reported, forming a vector segment, which ensures a smooth retraction and supply of the cutter to the treated surface and guaranteed chip breakage. Initially, the cutter is moved along vector 3, which represents an arc of a segment with radius Ri tangent to the main thrust detector and directed toward the main feed vector,

These additional movements in the radial direction along the arc of the segment by the magnitude K of the radial elastic deformations of the AIDS system due to the smooth reduction of the depth of cut allow smoothly reducing the cutting force and the load on the UShS system compared to the prototype, which has a sharper unloading system. The radius R of a circular arc can be set within t R K where t is the depth of cut, K is the magnitude of the radial elastic deformations of the USA,

0

0

nematics machine.

The cutting process is resumed under more favorable conditions tangential to the segment circumference, gradually loading the UShS system due to the smooth growth of the allowance when moving along the vector 5 of the main feed S, by 1 -, -, depending on the required chip length, determined by the physicomechanical properties of the material being processed and the cutting conditions, after which the process of interrupting the structure; ki is repeated,

Predls; The test method is tested on a CNC machine mod. BKZ OFZ equipped with CNC H22-W contouring system and four-position tool holder when machining a workpiece, which is a shaft with an outer diameter of 0 50 mm, 250 mm long from material 12X18H10T steel in the following cutting modes: cutting depth t 0.5 mm, cutting speed V 37 m / min, feed S 0,24,

The program for processing the contour of the part - L1; with chip breaking cycles, it was calculated using the SAP-SM4 auto-programming system and recorded on an 8-track punched tape.

Chip crushing parameters are as follows.

five

0

five

1, Segment radius R 0.5 mm,

°, 10 °, 20%

Angle of removal of the cutter AC 0 °, 10 °, 20

35 ° (see Table 1-4). The magnitude of the radial elastic deformations of the SSWS is determined experimentally and is K 0.15 mm.

2, R 0.15 mm,

about 0 °, 10% 20, 35 ° (cm. Table. 5-8), K 0.15 mm.

35 ° (see table 93 .R 0.3 mm, 0 0 °, 10, 20 °, 12). K Oh, 15 mm.

4. Processing by the method prototype (see tab. 13). Angle of about 20 °.

The test results of the proposed method of crushing chips in various chip breaking modes in comparison with the prototype method are shown in the table.

The results of the tests presented in the table showed:

at R t 0.5 mm, a high quality of the surface to be treated is provided (examples 2, 3),

at R K 0.15 mm, maximum performance is ensured (examples 6.7),

at R 0.3 mm (t R: K), an optimal combination of roughness and productivity indicators (examples 10, 11) is ensured.

The test results show that the application of the proposed method (examples 2, 3, 6, 7, 10, 11) allows to increase the quality of the surface treatment by 66-75% and the processing performance by 14-26% without reducing the durability of the cutting tool. in relation to the method of the prototype (example 13) due to additional taps of the cutting tool from the surface to be processed along the segment, allowing a smoother trajectory to be obtained.

0.15

-OK)

23-27 23-27

y

1AA4086

movements of the tool and improve the equipment performance.

Claims (2)

Formula isob rete n one . Method of kinematic fragmentation of chips on numerically controlled machines, including moving the cutting tool in the feed direction and additional movements for chip breaking, characterized in that, in order to improve the quality of the machined surface by improving the dynamic characteristics of the cutting process and increasing the productivity of the cutting tool while maintaining the durability of the cutting tool , additional movements are carried out along the arc of a circle tangential to the instantaneous vector house, then in the opposite chordal vector instantaneous feed direction at an angle of 10-20 ° is expected to last, then a circular arc, for bearing against said chord toward the main feed vector. 2. The method according to claim 1, which differs from the fact that the values of the radius of the arc of a circle are set within t R K radius of arc of a circle, depth of cut, K - the value of radial elastic deformations of the USh. system, Where R - t process that surface 1.01 1.01 116,124 70.15 20 80.15 35 23-27 20 trickle according to the method of prototype 34-43 / Phil. 2 1.01 140 Cutting the cutter into a mute surface 108 114 126 Ramming cutter in processed surface 1.00 100 .3 Phi.