SU1371774A1 - Method of turning - Google Patents

Abstract

The invention relates to the field of machine-tool construction and can be used with the greatest efficiency when processing rotary bodies having a large differential of machined diameters. The aim of the invention is to increase productivity. The part is processed by a step change in its rotational speed with an optimum cutting speed at each step, which includes a range of diameters, determined by mathematical dependence. 2 Il.

Description

113

The invention relates to the field of machine-tool construction and can be used with the greatest efficiency when machining rotation bodies, in particular when machining parts that have a large differential of machined diameters (for example, multi-spring block gear n, stepped shafts, etc.).

The aim of the invention is to increase the productivity and increase tool life when machining parts that have a large differential of machined diameters.

FIG. 1 shows a processing circuit according to the proposed method; FIG. 2 - breakdown of the removed allowance for the ranges when processing the multi-crowned block.

The treatment by the proposed method is carried out as follows. ,

Workpiece 1 is installed in the spindle of the machine and makes a re-movement movement. The tool block 2 is mounted on a rotating support (not shown) of the machine and performs a feed movement. In the case of the incisal block 2, groups of incisors w ,, t ,,,. W. The cutting edges of the incisors are shifted in the radial and axial directions in accordance with the removal allowance scheme (Fig. 2).

For processing by the proposed method, the cutting speed V, is optimal for this process. The upper limit of the range is taken to be equal to the largest diameter of the part (Fig. 1), mm:

 Maize G ° max i

The spindle rotation frequency is determined for the I range, rpm:

P

l QSlY -QT d,

The lower bound of the I range is determined, mm:

yuoi-uspt-s-gp

DMUKI MOk- :, Thu, 0

Cervical parts with d7D are machined at frequency n ,. To process the necks of the part, in which d, i, (not included in the I range), it is necessary to switch to the next stage of the frequency of rotation of the part, rpm:

1774

SHOO. d.

where d. - maximum diameter obra

bots that are not included in the 1 diameter range.

Next, determine the lower limit of the II range, taking into account that mm:

 IOOO-VonT Sf n A, “Hi m“ ks,

In a similar way, the boundaries of all subsequent ranges and the frequency of rotation of the part on each range are determined.

Example. On the machine tangential turning modes. The AT-10 was processed by the gear block of the intermediate shaft of the GAZ-53 transmission (part No. 53-170105С-10). The angle between the cutters is circular feed S 0.00412 rad / rev .; optimal cutting speed V 200 m / min; the duration of the switching frequency of rotation 1 "0.05 minutes

Upper bound of I range

D “O, KC, d„ ,, d, 160 mm.

Frequency of rotation on the I range

.n.r 400 rpm

 l d 1

Lower bound of I range

D D -., 2mm

DMUHI D.c..c. 5: m, e 14ZMM,

where m is the number of incisors that process the ends of the neck Ф160, the periphery and the ends of the neck Ф418

2Imj (m, m, + ha 8.

Necks А Ф148 and ends Ф144 enter т; in the range, mic C be processed in the form of a frequency

The upper limit of the II range will be the diameter

Ol, asg d, - 110 mm.

Frequency of rotation on the II range

1000 WEPt ,, ,,

n, - 7 580 rpm

F di

Lower bound of II range

Mission 2

p -MO-Uglt- and „„ KS, - 7G1Gt

Check the feasibility of processing cervical d 66 mm at a frequency n

i; m ,, m, n 7;

1 goo-200 0j 00412-0 05

 l MOIKCj

3.14.7.

 88.5 MM

since 0 ,, 88,5 d 66, then the neck d 66 mm is impractical to handle at a frequency of n ,, 580 rpm

The upper limit of the III range is taken equal to

d 4 66 mm. Frequency of rotation on the III range

  970 rpm ii-d.

Lower Border III Range

D D -1092-Y- -S -n 49.4mm

 minz mchiz | ((

where t 4 m 5 9.

Since d 48: d (, 49,4, the neck dj is impractical to process at a frequency of

Upper limit of IV range

DMC.KCC ds mm - Frequency of rotation of the IV range

1000 V

Lt

 1326 rpm

TT-dj Lower limit of IV range

1000-Vorrr SO

 vaKC4 з7Т41Гт5б

Where

m.

9 - the number of incisors, processing neck F40.

All remaining diameters are in range IV, so it is advisable to process them with a frequency of

Claims (1)

Invention Formula Method of turning by rotating multi-blade tool parts such as rotation bodies with a variable diameter in which the parts communicate the main movement, the tool is informed of the feed movement, and the frequency of rotation of the part is changed during processing, characterized in that, in order to increase productivity, the part is conventionally divided into sections, the radial dimensions of which satisfy the condition 25 max 1and  1220iY ° j - Sj f. L f. mn e. where is the upper diameter of the range, mm; lower diameter of the range mm; Vpp - optimal cutting speed, m / min; SRP - round feed, rad / rev; € „- switching time to a different rotational speed, pin; t - the number of cutters, removing the allowance in the range of diameters In ,, „- D ,. b | - the angle between the consistently working cutters, glad and processing within each of the sections is carried out with a constant frequency of rotation of the part. 1