SU1313649A1 - Method for automatic corrective adjustment of tool and device for effecting same - Google Patents

Abstract

This invention relates to machining, in particular, to automatic control of tool setting. The purpose of the invention is to increase the processing accuracy and simplify the design of the device. For this, a sub-adjustment, when signals are received of the same sign as in the previous sub-adjustment, is made after each signal, and when alternating signals of different signs, the next adjustment is made after accumulating so many signals of the corresponding sign, which exceeds at least one signal is the number of signals of the opposite sign within a given group. The storage element is a link 9, made with a groove, the side walls of which provide a clearance K in the direction of the sub-adjustment movement relative to the conjugate link 9, as determined from the K MTi equation, where M is the specified number of accumulated signals; T is the value of the sub-adjustment movement of the sub-adjustment drive after the single signal has been stupefied; i is the gear ratio of the chain from the subsetting drive to. link, performed with a groove. 2 sec. f-ly. (L 00 with OD 4i

Description

113

The invention relates to metal cutting and can be used to improve machining accuracy on metal-cutting machines, in particular on turning multi-spindle machines.

The aim of the invention is to improve the accuracy of adjustments by taking into account the nature of the change in sign of the deviations in the dimensions of the workpieces.

According to the proposed method, after accumulating a given group of signals of the same sign, deviations in the size of parts above the set limit, when signals are received with the same sign as in the previous adjustment, after each signal, when alternating signals of different signs alternate, the following adjustment is performed after accumulation such a number of signals of a corresponding sign, which exceeds by at least one signal the number of signals of the opposite sign within a given group.

FIG. 1 shows the proposed device mounted on the carnival multi-spindle machine, general view; in fig. 2 shows section A-A in FIG. 1 (according to the sub-adjustment drive;); in fig. 3 and 4 are diagrams of the rotary actuators of the adjusting, respectively, with the screw and cam links for adjusting the tools; in fig. 5 is a diagram of a translational actuator sub-adjustment with a wedge link for adjusting the tool.

The device for automatic subsetting (Fig. 1) is assembled on the gantry 1 of the longitudinal support of the turning multi-spindle automatic machine, in the rotary spindle unit 2 of which the cartridge 3 is mounted with parts 4 and 5 fixed in them. The device consists of a rotary actuator 6 subsetting with an output shaft 7 connected by means of a driver 8 with a link 9 fixed to shaft 10 by means of key 11. The shaft 10 is provided with a conical section — a cone 12 and a thread 13. On the cone 12, a follower 14 is supported, which contacts the elastic part 15 of the tool holder 16. In y nother portion 15 is fixed cutter 17. The meter 18 is placed in the next position of the machine.

five

0 35 40

A groove is made in the hole of the link 9 in the section adjacent to the shaft 7, the lateral sides 19 and 20 (Fig. 2) of which are separated by an angle K, forming a gap with respect to the driver 8. An adjusting screw 21 is placed against the lateral side 20 of the groove .

In the embodiment illustrated in FIG. 3, gear 22 is located on the output shaft 7 of the subsetting actuator 6, which is associated with gear 23. The latter can transmit rotation to the screw 24 through links 8 and 9, in conjunction of which a gap K is provided.

The embodiment shown in FIG. 4 differs from the embodiment depicted in FIG. 3, the absence of a gear and the presence of a cam 25 attached to a link 9.

In the embodiment shown in FIG. 5, a subsetting actuator 6 is applied with an output rod 26 having the possibility of translational movement. Pinned on stock 26

the lead 8 is placed in the groove of the link 9, made integral with the wedge 27.

The elevation angles of the threads of the screws 13 (Fig. 1) and 24 (Fig. 3), the helix of the cam 25 (Fig. 4), the angles of the cone 12 (Fig. 1) and the wedge 27 (Fig. 5) are made of self-braking condition smaller than the value of friction angles.

The size of the gap K is made, the outcome of the condition

0

To MTi,

de M is the specified number of accumulated signals (M 2, ..., 4, depending on the processing conditions);

the amount of the sub-adjustment movement of the output link of the sub-adjustment drive 6 after the arrival of one signal; the gear ratio of the chain from the actuator 6 subset to the link 9, made with a groove (for the designs of figures 1, 4 and 5;

T 1 for option by

, 222 -Z ,,

FIG. 3 where

Zjj, respectively, of the number. Teeth leading 22 and driven gear 23).

The device works as follows.

After finishing the machining of parts 4 (Fig. 1), the carriage 1 with the sub adjusting device departs (to the right in Fig. 1) from the machined part, the latter is transferred with the spindle block to the measurement position under the gauge gauge 18. At the same time, the next part is machined the previous working position where the carriage 1 moves along the part at the speed of the working feed.

When the part size exceeds the set limit in the direction of increasing or decreasing, the signal of the corresponding sign goes to the subsetting drive 6, causing the shaft 7 to rotate (or move the rod 26 (FIG. 5) to the specified subsetting step T in the required direction. On the same The magnitude of the displacement travels 8 (in Figs. 2, 4, and 5) connected directly to the output link of the drive. In the presence of intermediate gears, the lead 8 travels by an amount of 1T, where i is the kinematic chain's gear ratio from the retuning to the lead 8 on fig.Z movement of the driver 8 after the arrival of a single signal is

.eleven. t

7 23

where Z, and Z, respectively

22 23

but the number of teeth of the driving and driven gears 22 and 23. As the signals of the same sign arrive, the driver 8, moving by step T for each signal, gradually approaches one of the lateral sides of f9 and 20 (Fig. 2) of the groove, without causing adjustments. In this way, the accumulation, counting and storage of signals is carried out. The signals accumulate until the gap is completely selected, i.e. until the driver 8 touches the corresponding side of the groove or the end of the adjusting screw 21 (Fig. 2 and 5). Upon receipt of the next signal of the same sign that preceded the choice of the gap, a sub-adjustment occurs, as the lead 8, shifting one step, rotates the link 9 (Fig. 2), or moves it linearly (Fig. 5), the link 9 in its the turn turns the screw 13 (figure 1) which is displaced along the thread in the tool holder 16, causing a longitudinal displacement of the cone 12, which, acting through the pusher 14 on the elastic part 15, rotates it by a given angle

with

5 0 5

five

0

around the axis of the weakened section, together with the sub-adjustment movement of the cutter 17. If, when measuring the next part, it turns out that the sub-adjustment is not enough, i.e. the intensively growing error is not fully compensated; a signal of the same sign as the previous one will be sent to the subsetting drive. In this case, the adjustment is carried out immediately after the signal is received, since the leash 8 continues to contact the mating surface of the link 9. When alternating signals of different signs, indicating random size deviations, the subsetting drive 6 and the leash 8 perform a reciprocating rotational return -accessible) movements, without transmitting motion to link 9, i.e. not issuing a command for sub-adjustment of the cutter 17. Thus, the cutter 17 does not respond to random perturbations.

The number of accumulated signals in the group is determined by the size of K gap in link 9 and can be changed by adjusting the screw 21 (Figures 2 and 5) or by using a set of several interchangeable links with different gaps. With a large angle of rotation of the shaft 7 of the actuator 6 (Fig. 1), when the groove of the required size in one section of the link is difficult to perform, the grooves are made in several links of the kinematic chain or in one link adjacent to several others. So in the device shown in FIG. 1, the groove in link 9 can be made in two sections mated to links 8 and 11, with the total size of the gap determining a given number of signals in a group.

5 I

If the ratio of the magnitude of the gap K

(Fig. 2) to the step T of the link 7 is expressed by a fractional number, then the subset. opposite sign with respect to 0 to the previous one is carried out at an incomplete step, and subsequent sub-adjustments of the same sign - at a full step, i.e. in this case, the number of accumulated signals in the group is actually specified by a fractional number.

The implementation of the sub-adjustment after each signal of the same sign as in the case of the signals that caused the previous sub-adjustment ensures that

five

low machining accuracy in conditions of intensive increase in systematic errors caused by increased tool wear during the period of running-in and machine heating, in contrast to the known method, in which, regardless of the intensity of increase in errors, the command for adjusting is given only when a specified number of signals are accumulated.

The implementation of the subsetting when alternating signals of different signs after accumulating the number of signals of the corresponding sign, exceeding at least one signal the number of signals of the opposite sign, allows again accumulating the signals of one link, but already in a smaller number compared to the given number, flexibly applies to processing conditions, and when the same number of alternating signals of opposite signs arrives, the commands for sub-adjustment will not be given.

This allows, under the conditions of tool run-in and machine heating, accompanied by an intense increase in systematic processing errors, while simultaneously revealing random errors causing the appearance of signals of the opposite sign, to subordinate the number of sub-channels towards compensating for the most frequently occurring errors and At the same time, it does not respond to the appearance of individual random deviations of the opposite sign.

Claims (2)

Invention Formula . one . The method of automatic adjustment of the tool, in which the sign of the deviation of the dimensions of the parts being worked from the predetermined value is determined, accumulates the number of deviations of one sign to the specified number and, depending on this 136496 carry out the adjustment tool, characterized in that, in order to improve the accuracy of the adjustment when obtaining deviations of the same 5 signs, as in the previous adjustment, the adjustment is made after receiving each such deviation, and with the alternation of deviations of different signs, the number of deviations of different signs is accumulated and the next adjustment is made after the accumulation of such number of deviations of the corresponding sign, which exceeds at least, 15 for one number of deviations of the opposite sign within the specified. 2. An automatic tool sub-tooling device comprising a sub-tool drive associated with it. 20, by means of kinematic links, a self-braking element for adjusting the position of the Instrument and an element for memorizing the sign of deviations of dimensions and loading of a command for sub-adjustment 25 after accumulating a predetermined number of deviations of one character, which is due to the fact that, at least one of the kinematic links of the kinematic connection, made with a groove providing a clearance relative to the conjugate link, is used as the memory element, derived from the equation 35 To MTi, where K is the size of the gap between the links; 40 M - the specified amount of deviations; T is the value of the sub-adjustment movement of the sub-adjustment drive after the arrival of one deflection; i is the gear ratio of the chain from the subsetting drive to the link made with the groove. FIG. 2 In 23 / .JP 1 6 n Figm // /////// / l  .l / r / | z o ////// U / /./. 27 FIG. five / 7 g / 7 Editor T. Parfenova Compiled by V. Alekseenko Tehred L. Serdyukova Proofreader S. Cherni Order 2166/15 Circulation 787 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4