JPS5894950A - Turret rotation control device - Google Patents

Abstract

PURPOSE:To reduce the rotational speed of a turret when the turret comes up to the next indexing position and stop it when reaching said indexing position by outputting a shorter circuit signal while discriminating the shorter circuit direction of the turret. CONSTITUTION:The shorter circuit direction of a turret 1 is operated in a shorter circuit direction discriminating circuit 8A, and the turret 1 is turned while controlling a hydraulic motor 6. The position of the turret is detected by a main shaft detecting sensor 11, and the rotational speed of the turret is reduced by controlling a speed reduction electromagnetic valve SU3 via a flip flop circuit 8q and a NAND circuit 8s. When it is detected that the turret arrives at the next indexing position, an electromagnetic valve SV1 is actuated, allowing the rotation of the turret 1 to be stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a turret rotation control device for performing turret rotation (GL) at high speed in an NC lathe.

in, N0m board turret, machining center ATC
There is a trend toward faster indexing control for JIJ extraction tables, and in particular, there is a strong demand for reducing the rotation time of the turret, as it greatly affects Fi pusile time.

Currently, the mainstream way to control the rotation of this turret is to use software to control the rotation of a hydraulic motor. There is a drawback that the timing of control signals such as signals deviates from accurate timing. The reason for their shortcomings is that when a program is processed by a microprocessor, several to hundreds of pulses are always required, and the input/output data is scanned by time division, making it appear fixed. 0 due to the fact that the timing of changing No. 9 actually read in is unstable, etc. And according to the software control, when the turret rotates at high speed, K becomes a slow value because the slow n of the control signal is ignored, and the turret does not reach the target. The purpose of the present invention is to provide a 1g1 transfer device that eliminates these drawbacks. a shortcut determination circuit that receives the output signal and the next indexing position setting signal, determines in which direction the turret should be rotated in a shortcut, and outputs a rotation signal for the turret according to the result;
and a rotation control circuit that detects when the turret approaches the next indexed position and issues a signal to decelerate the rotation of the turret, and also issues a signal to stop the rotation when the turret reaches the indexed position. It is in.

Hereinafter, one implementation of the present invention applied to an NC lathe will be described with reference to the drawings.

(tl turret, (2) shows the turret shaft, (3) shows the crankshaft linter box installed in the middle of the turret shaft (2), and the movement of the piston of the cylinder (31) in the box (3). In conjunction with the motion, the gear (4) is engaged and the shaft (2) is in a clamped state, or the gear (4) is disengaged to obtain an uncranked state of the shaft (2). 7jo (5) t'i this axis (2)
A t-gear is provided on the root side of the t-gear, and the gear (5) is in t-meshing with a fixed gear <am) on the rotating shaft of the hydraulic motor (6);
When the shaft (2) is in the unclamped state, the turret (1) is driven by the forward or reverse rotation of the hydraulic motor (6).
) rotates in the 1h direction or counterclockwise at times, and the member (7) represents a cord disk fixed to the root end of the shaft (2), and the force is 7i In 12 fan-shaped portions (7a), 7 ft of light-transmitting portions (7b) and light-shielding portions (yc) are formed so as to correspond to the numbers of the indexing positions and to obtain binary numbers, and one of each fan-shaped portion (7a) is formed. A slit-shaped light-shielding part (7d) was formed on the center line at the outermost circumference, and light-shielding parts (7e) and (7C) with equal widths were formed on both sides of the light-shielding part (7d). (8) is a rotation control device, and (9) is a rotation control device ( 8)
Electric-hydraulic chamber conversion-1αO#i said circle #(
7) A light source provided opposite to one surface of a]) In addition to the Fi pattern disk (7), the main detection sensor for the indexing position of the turret (1) is shown, and the sensor aυU is parallel to 4 α2 is a turret (
1) shows an auxiliary detection sensor for detecting deceleration and stopping, and the sensor (2) also consists of a phototransistor.

Next, the rotation control device (8) and the electro-hydraulic conversion device 1l (9) &C will be explained in detail.
(8) is composed of a shortcut discrimination circuit (8A) and a rotation control surface ji& (8B) as shown in the second diagram, and the discrimination circuit (8A) is constructed as follows.

That is, in the figure, (Sa) is the current index position.

That is, the input part for the number of the current indexing position of the turret, that is, the first input part btsb) is the input part for the number of the next indexed position of the set turret, that is, the second human power part. The input section for the final digit of the index position, that is, the third human power section (tsd) is the first comparison circuit, (8e)
indicates a second comparison circuit, and the fifth input side of the first comparison circuit (8d) is connected to the first input section (8p) via a latch circuit (8p).
8a) Also, the second human power department and the third human power department (8c) VC
At the same time, the first input of the second comparison circuit (8e) @
@Medication 1 input part (8p) via the latch circuit (8p)
In m), the second human power section (8b) is connected to the second human power section (8b). ) is an adder circuit (8g) and 4 pieces t7) as shown in the figure.
ot path (8h)... (8h) and 1 For example, if the number of the final index position of the turret is 12, the number of the stick is 6, and the current index position is 6 or more, for example If it is 5, calculate the opposite number of 5-1-6=11, and if the current index position is greater than 6, for example 8, then 8.
The number on the opposite side of -6=2 is now calculated. (80
indicates a third comparison circuit, and the first one of the third comparison circuit (81)
The input terminal was connected to the second human power section (8b) and the second input terminal was connected to the output side of the correction circuit (8g).

(8j)ii The logical formula described later, namely (E, F+E-F-G
+E, FG) is shown, and the arithmetic circuit (8j) is an OR circuit (8k) and three NAND circuits (8t) (8m) connected to the input side of the OR circuit (8k) so as to provide reverse input.
(In), and these NAND circuits (@A) (i
lm) (8n) input @ to the first comparator circuit ts as shown in the figure.
a) to the second comparison circuit (8e) and the third comparison circuit (8i)
connected to the output side of each.

Next, the principle of the shortcut discrimination circuit will be explained.

First, the number of the current index position of the turret...A number of the next index position set by the turret...B number of the position opposite the current index position on the turret...・・・・・・・・・・・・
・・・・・・・・・The number of the final index position of the C turret is D/2, and the next set where ffA≦D/2 is EA) D/2
The set that holds is E A) The set that holds B is F A (The set that holds B is F B The set that holds B≦C is G B) The set that holds C is G, then nil, FnF, GnG1EnFnG#Bn
FnG is all empty sets. Therefore, the following six combinations remain.

EnF'nG”＝・・・・・・・・・・・・・・・・・・
・・・・・・(匍EnFnG・・・・・・・・・・・・・・・
・・・・・・・・・・伽）BnFnG・・・・・・・・・
・・・・・・・・・・・・・・・・・・ (C) EnFnG
・・・・・・・・・・・・・・・・・・・・・・・・
(d) EnFnG・・・・・・・・・・・・・・・・・・
・・・・・・・・・ (e) EnFnG・・・・・・・・・
・・・・・・・・・・・・・・・ (f) Here, the fifth
As shown (turret JI divided into 12! IJ disk (7
), D=12, so D/2-6, so in the case of set E of A-1 to A-6 and the case of set E of people = 7 to 12, Think separately.

And in the case of the former E, if we assume that the defeat is 3, then C
-3-) @-, 9.

In the case of EnFnG (a), as shown in Figure 3 (a), the range of set F is the area indicated by arrow F, and the range of east q is the area indicated by arrow G, thus The area that satisfies (a) is the common part X of the area indicated by arrow F and the area indicated by arrow G. This means that when B = 1 or 2, the turret cannot rotate clockwise as indicated by arrow Y. It will be a shortcut. Also E
When Φ) of nIi'nG occurs, as shown in Figure 3 Φ), there is an area of F, an area of GO territory, and a common area of both provinces Turning counterclockwise as shown by arrow 2 is a shortcut. XBn
In the case of (C) of FnG, $3 is as shown in Figure (C) (There is an area of F and an area of G, and a common area of both and l is X K B if
In the case of B-10-12, the turret rotates clockwise as indicated by arrow Y.
In the case of cB, if A=8, then C, -8-6-2, and in the case of (d) of 100 nFnG, there exists a region of F and a definition of q as shown in Figure 3 (d). If there is a common area XVcB between the two and B==1 or 2, then turning the turret counterclockwise as shown by arrow 2 is a shortcut 0 or E.
When n h゛n100 (e), F as shown in Figure 3 (6)
A region of , and a region of d exist, and B exists in a common region X of both.

In the case of B depths 3 to 7, the shortest way is for the turret to rotate clockwise as indicated by arrow Y.

Also, when 'Mnpn 100' (f), the area is F as shown in Fig. 3 (f).

A stone area exists, a common area XKB exists for both, and B
In the case of -9 to 12, in this case, the turret turns counterclockwise as shown by arrow 2, which is a shortcut, so (a)
(C) Also, in the case of Fi(e), the turret rotating clockwise is not a shortcut, and in the case of (bL(d) or (f), the turret rotating counterclockwise is a shortcut. becomes.

Therefore, when rotating clockwise, the logical sum E n F n
G-fJnFnG+EnFnG, that is, E, F-G1E @
F @G+g, I? , G, and if we pay attention to the first mK, as mentioned above, EnFnG is an empty set, so Bn
If P holds true, the condition of the first term is satisfied. Kateri, F
If l knee F-(j+E・F, G holds, clockwise rotation is the shortest way.If this does not apply, counterclockwise rotation is the shortest way.9
0 where the arithmetic circuit (8j) is established Next, the rotation control circuit (8B) ij is configured as follows -gt'
I'm here.

That is, in FIG. 2, the rotation control circuit (8B) $7R-
It consists of 8 flip-flop circuits (8q), and the reset reverse input side of the flip-flop circuit (8q) is NA.
The auxiliary detection sensor (6
) and the second comparator circuit (8C) are connected to Tagata @ of OA=H, and the set reversal input side is connected to the second comparator circuit (8C).
6) is connected to the d car of A=B. In history, the set output side of the flip-flop circuit (lq) is connected to the deceleration magnetic valve (SVS) via the NAND circuit (8s).
), and the reset output side is connected to a clamping solenoid valve (8Vl) [4 in series, and as described later, when the turret (1) approaches the next index position rItVc, the former solenoid valve (SVS ) to decelerate the rotation of the turret (1), and when the turret (1) reaches the next indexing position, the latter solenoid valve (SVl) is activated to decelerate the rotation of the turret (1).
The rotation of 1) was stopped.

(8t) indicates a D flip-flop circuit, and the clock input side of this circuit (8t)H is connected to the unclamp limit switch (to), and the input side is connected to the output side of the recent judgment circuit (8 people). At the same time, the set output side and reset output side are each connected to an nNAND circuit (8u) (ay
) The rotation direction switching solenoid valve (SV2) is connected to the PC via the t-t. (8W) receives the open signal of the limit switch α and the set output signal of the flip-flop circuit (8q) and outputs the NAND circuit (8u) (llv
) shows a NAND circuit that outputs gate signal E.

Next, regarding the Shinso-hydraulic conversion system* (9), i! As shown in Figure 4, this device (9) is interposed between the oil pressure source side pipe (9a) and the oil discharge side pipe (9b) leading to the crank cylinder (3a) and the oil discharge side pipe (9b). A cylinder solenoid valve (8V1) and @1 branch pipe (9C) which branches from the oil pressure source side pipe (9a) and connects to the oil discharge side pipe (9b) via the hydraulic motor (6) t-H. ) is interposed between the rotation direction switching solenoid valve (8V2), the first branch pipe line (9C), and the first branch line (9C), which further branches from the first branch pipe line D (9e). through the oil discharge side pipe (
9b), and a deceleration solenoid valve (8Va) interposed therebetween.

In Figure 4, (of) a oil tank Th (9g) t'
i Hydraulic pressure 4, indicates pump. Next, regarding the operation of the above embodiment, the case where the current indexing position of the turret (1) is No. 5 and it moves from the top to the next indexing position No. 3 will be explained.

This will be explained with reference to the time chart shown in FIG.

If the current index position is number 5, 1 yen m (7) t-
The main detection sensor consisting of four transistors (01) ff is similar to the shape of the light transmitted from the light source.

As a result, the m1 input section (8a) has 10
Obtained (0101) at ~18 hours.

Next, at time t, the second human power section (8b) is
(0011), which corresponds to 3, is input. As a result, the output of the shortcut discrimination circuit (8 people) is as shown in the same figure (C).
In other words, (olto) corresponding to D/2-12/2=6 is input to the third human power section (8C), and thus, in the first comparator circuit (8d), this 6 and the first It compares 5 from the input section (8a) and generates 0 as the output of A)H.

In addition, in the second comparison circuit (8C), the first input section (8a
) and 3 from the second human power section (gb), and the output of A=H is 0. as shown in FIG. 6(i). Also A
(0.A as the output of B) t-'1 is generated as the output of H. At the same time, the arithmetic circuit (8f) generates an output of 5+8=11, that is, (1011) as the number of the current index position.
The Ex-0a circuit (8h) subtracts when the output of the second comparator circuit (8d) is 5, and adds when the output is 0. Thus #
! In the 3 comparison circuit (81), 3 from the second human power section (8b) and 11 from the arithmetic circuit (8f) are compared and A>H.
ot- is generated as the output of . That is, in the above case, the set E% is calculated by the comparison circuits (8d), (8e), and (8m).
It is determined that n belongs to sets F and q, respectively.

Thus, Fil and l are connected to the first NAND circuit (8t).
is input and outputs 0, and the second ONAND circuit (8m)
inputs O%O and l and outputs 111-, and inputs tfl, 0 and 0 to the third NAND circuit (8n) and outputs i
Output f. Then, these outputs are inverted and inputted to the 0a circuit (8k)ff to generate an output of l.

On the other hand time 1. The index position of the turret (1) is still fixed at No. 5, and the light from the light source (9) is transmitted through the slit-shaped transparent part (on the center line of the outermost part of the disk (7)). 7d) and is received by the auxiliary detection sensor 33,
The sensor (6) outputs an output of 1 as shown in FIG. 6 (0). In this way, l and 0 are input to the NAND circuit (8r), and the <it ratio is output as shown in the same figure (g).As a result, together with the outputs 0 of A and B of the second comparator circuit (8e), The R-87 lip 70 tube circuit (8q) is set to t, and as a result outputs O as a reset output as shown in (4) in the same figure, and the solenoid valve (s
vt) Put the clamp cylinder (3a) into the state of t-position (1) and deactivate it, and unclamp the turret @ (2) e. Unclamped switch α3ij detects this unclamping, and the output changes to 1 as shown in (2) in the same figure.As a result, the NAND circuit (8W) inputs 1 and l, and the output changes to 1 as shown in Φ) in the same figure. At the same time as it changes from
) output 11 manually as shown in the same figure (d)) 14
1 power changes from O to 1, and the reset output changes from 1 to O as shown in the same figure (el).Thus, the NAND circuit (8u) is! In response to inputs 1 and 5, the NAND circuit (8V) receives inputs 1 and 0, and the output changes from 0 to 1 as shown in (f) in the same figure. Switching from position (I) to position (1), the hydraulic motor (6) is driven to rotate counterclockwise, and the turret (1) is rotated through the meshing gears (5) and (@a). Rotate clockwise to vomit. As a result, the main detection sensor 01 detects the first input section (
8a) t;j t*after 4 MJ chi (otoo) is shown,
Also 1. The latter 3 (ooll) is shown. This No. 3 input is then passed through the latch circuit (8p) t- to the second comparator circuit (8p).
e) Since it is input after Kt4 and this number 3 is the next indexing position, the output of A to B of the second comparator circuit (8C) is as shown in the same figure (
Changes from O to 1 as in i). This allows the NAND circuit (
8s) Enter Fil and l to change the output from 1 to 0 as shown in the same figure, and change the solenoid valve (8Vs) from (1) to (1).
Switch to the position. Thus, the oil discharge path from the hydraulic motor (6) is connected to the second branch pipe (9d) through the throttle (9e) and the intervening second branch pipe (9d).
)K, the hydraulic motor (6) is decelerated.

Along with this, the rotation of the turret (1) is also decelerated. After that, when the slit-shaped transparent part (7d) of the turret (1) comes to a position facing the auxiliary detection sensor (2), that is, 1. When the output of the nuclear sensor (a) changes from O to IK as shown in the same figure (i),
The output of the NAND circuit (8r) changes from 0 to 1 as shown in the same figure.

Thus, reset the R-87 lip-flop circuit (Iq) Ifi! J-I! j/)lt17fi! As shown in (4) in the same figure, it changes from 0 to 1, and (magnetic cell (8Vl) changes from (1) to (
Switch to position 1), cranno cylinder (31) t-
As a result, the unclamp limit switch 03 closes and its output changes from l to 0 as shown in the same figure), and the NAND circuit (8u) and (8v) ij NAND circuit (8W ) and an inverter to one of the input terminals, thus NAN
The outputs of D circuits (8u) and (8v) both become 1, and the solenoid valve (SVZ) returns to the neutral position of (1), stopping the drive of the hydraulic motor (6).

Turret (1) is fixed at the 3% position. In other words, according to the above embodiment, since the signal is processed by the comparison circuit using IC etc. and the NAND circuit, it takes 0.25 μs to determine the shortcut direction.
Along with being able to do it at high speed with EC.

According to experiments, the delay time of the control signal is approximately 0.1 m 86C, which is extremely infertile compared to 80 to 110 m5ec when using software.Thus, deceleration can be performed extremely efficiently, making (1) faster. Is it correct even if it rotates? 8! It can be stopped in a busy position. Furthermore, the slit-shaped light-transmitting portion (7d) of the disk (7) t-transmits the transmitted light to an auxiliary detection sensor 02.
The system receives the current detection signal, processes it with a NAND circuit, etc., and immediately clamps the turret shaft (2) at T-clamp to stop it, so accurate indexing is possible even if there are disturbances such as load fluctuations. The location is obtained.

As described above, according to the present invention, compared to conventional software control, high-speed indexing control is possible, accurate indexing position 1d can be obtained without being affected by disturbance, and the circuit is simple and the number of parts is small. It has the advantage of being compact and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram when the present invention f is applied to an NC lathe, Fig. 2 is a circuit diagram of the main part of Ilt, Fig. 3 is an explanatory diagram explaining the principle of recent machine discrimination, and Fig. 4 is an electrical - A hydraulic circuit diagram related to the hydraulic converter, FIG. 5 is a plan view of the cord disk, and FIG. 6 is a time chart of the operation of each component. (1)...Turret% (8 people)...Next generation discrimination circuit, (8B)...Rotation control circuit Patent Applicant: Takamatsu Machinery Co., Ltd. Figure 4 and Figure 5 tot+ tz? , 5 t41
5263

Claims (1)

[Claims] Detection of turret indexing position Upon receiving the output signal from the sensor and the setting signal for the next indexing position, it is determined which direction the turret is rotated in is the shortest direction, and the turret is rotated according to the result. A shortcut discrimination circuit that outputs a signal detects when the turret approaches the next indexed position and issues a warning signal to decelerate the rotation of the turret, and a signal to stop the rotation when the turret reaches the indexed position. A turret rotation control device consisting of a rotation control circuit that outputs.