JPH056847B2 - - Google Patents

Description

[Detailed description of the invention] (1) Field of industrial application The present invention is applicable to machine tools, especially NCs having multiple turrets.
After turning a workpiece on a lathe using tools mounted on multiple tool posts, for example, machining the end face of the workpiece (hereinafter referred to as body width processing), the position of the machined end face of the workpiece is measured with a touch sensor mounted on one of the tool posts, and the The present invention relates to a measuring device for a plurality of turrets that enables data transfer of measurement data as processing correction data for another turret.

(2) Conventional technology It has been known that machine tools, particularly NC lathes having multiple turrets, process the body width of a workpiece using tools attached to multiple turrets.

Moreover, when measuring the body width of the workpiece after processing the body width of the workpiece, it was measured using a touch sensor attached to each individual tool post, and the amount of correction of the tool was further corrected based on the measurement data.

(3) Problems to be Solved by the Invention However, the above-mentioned measuring means requires a plurality of touch sensors to be installed, which is uneconomical. In addition, if measurements are simply made using a single touch sensor, the operator must input the tool correction amount at the time of measurement for the machining program data of each turret, taking into account the mutual relationship. It was inefficient because it was extremely time-consuming, involved many mistakes, and required a considerable amount of time.

(4) Purpose The purpose of the present invention is to solve the problem in view of the above-mentioned circumstances.The purpose of the present invention is to save time and effort during measurement by providing a mutual correction data transmission/reception function. An object of the present invention is to provide a measuring device for multiple turrets that improves efficiency.

(5) Means and operation for solving the problems In order to achieve the above object, the present invention provides an NC equipped with two tool rests movable in two orthogonal planes in order to process a single workpiece. In a machine tool, a measuring means is attached to one of the two tool rests to measure the end of the workpiece and calculate the distance from the origin in the rotational axis direction of the workpiece, and a processing location of the workpiece. input means for setting reference values and their tolerances; first coordinate system setting data means for setting the machining coordinate values of one of the tool posts by the input means; a coordinate value data means for measuring and storing the measured value; a first calculating means for calculating a difference value between the coordinate value data means and the first coordinate system setting data; a comparison means for comparing the difference value and a preset reference tolerance, and when the difference value is smaller than the tolerance value and satisfies the machining continuation condition,
a second calculation means that transfers the difference value obtained by the calculation means to the first coordinate system setting data means and performs a calculation for rewriting the data; a second coordinate system setting data means set for machining the tool post; and the first
a third calculating means for performing a correction calculation for transferring the difference value obtained by the calculating means for processing the other tool post and rewriting the data in the second coordinate system setting data means; a tool correction data means for storing the difference value obtained by the calculation means of the other tool post as a tool correction value of the other tool post, the data measured by the measurement means, preset reference data, correction data obtained by the calculation means, etc. and a central control means for numerical control by transferring data between the respective means, and based on the measurement data of one of the turrets, the correction value is set as the correction value of the other turret based on this measurement value. This is a measuring device for multiple tool turrets, which is characterized in that the coordinate system setting data of both tool turrets can be corrected with the same correction value, and when measuring with the measuring device of the present invention, the time and effort required for measurement is reduced compared to conventional methods. It is considerably shorter than that, further improving measurement efficiency.

(6) Example Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a front view of an NC lathe having multiple tool rests to which the present invention is applied, and FIG. 2 is a side view taken in the direction of arrow I in FIG.

In FIGS. 1 and 2, a headstock 2 is placed on the left side of a horizontal bed 1, and a main spindle 3 is pivotally attached to the headstock 2. As shown in FIGS. A chuck 4 for gripping a workpiece W is attached to the main shaft 3.

The main shaft 3 is rotated by the motor 5 at a predetermined rotational speed via a pulley 6 and a belt 7 that are mounted on the motor 5 and a pulley 8T that is mounted on the rear of the main shaft 3.

A slide bed 9 is placed on the horizontal bed 1, and a tailstock 10 is placed on the right side of the slant bed 9 and is moved in the Z-axis direction.

A tailstock shaft 12 is inserted into the front surface of the tailstock 10, and a center 13 is attached to the tailstock shaft 12 to press the work W against the center of the end surface.

A right saddle 14 and a left saddle 15 are placed on the rear part of the tailstock 10, and each is driven by a servo motor 1.
6 and 17 in the Z-axis direction.

A cross slide 18 is placed on the right saddle 14, a cross slide 19 is placed on the left saddle 15, and a right tool rest 20 and a left tool rest 21 are placed on the cross slides 18 and 19, respectively. The right tool rest 20 and the left tool rest 21 are each driven by a servo motor 22.
and 23 in the X-axis direction.

Turrets 24 and 25 are pivoted to the front surfaces of the right tool rest 20 and the left tool rest 21, respectively, and are rotated and indexed by a drive device (not shown).

A plurality of tools 26 are attached radially to the turrets 24 and 25, and a transfer type touch sensor 27, which is a measuring device, is attached to the right tool rest 20. Note that the right tool rest 20 and the left tool rest 21 each have an independent machining program.

The chuck 4 attached to the tip of the main spindle 3 grips the workpiece W, and the center 13 attached to the front of the tailstock spindle 12 presses the end surface of the workpiece W, and the motor 5
The workpiece W is rotated by rotating the main shaft 3. Turret 2 of right turret 20 and left turret 21
A tool 26 attached to parts 4 and 25 performs turning for a predetermined body width.

The principle of performing girth processing on the workpiece W and then measuring it with the measuring means of the present invention will be explained based on FIG. 3.

In FIG. 3, a workpiece W is gripped by a chuck 4 attached to a main spindle 3 supported on the front surface of the headstock 2, and the other end surface of the workpiece W is pressed by a center 13 attached to a tailstock spindle 12.

The tool 26 attached to the turret 24 of the right tool rest 20 is moved in the X and Z axis directions, and the workpiece W is
Turning of the end face portions W _z0 and W _z1 is performed using a pre-installed machining program. Further, the tool 26 attached to the turret 25 of the left tool rest 21 is moved in the X and Z axis directions, and turning is performed on the end face portion _Wz2 of the workpiece W according to a pre-installed machining program.

W _z0 , W _z1 and W _z2 , which are the end faces of the workpiece W,
After turning W _z3 with the tools attached to the turrets of the right and left tool rests, the touch sensor 27 attached to the turrets of the right tool post is transferred, and the end face W _z0 of the workpiece W is first turned. Distance Z _pr from the mechanical origin _nr of the right tool rest 20 by touching the touch sensor 27 to (program origin _pr )
Measure. This distance Z _pr becomes coordinate system setting data that is first coordinate system setting data. Since the coordinate system setting value Z _pr ′ at the end surface W _zp of the workpiece W has been input before, the difference value △Z _pr is
△Z _pr = Z _pr −Z _pr ′. In addition, since the tolerance value △Z _p of the previous coordinate system setting value △Z _pr ′ at the end surface W _zp of the workpiece W has been input previously, these tolerance values △Z _pr and △Z _p are compared. However, if △Z _pr > △Z _p , it is outside the tolerance range and is fed back as a defective origin tolerance. If △Z _pr ≦△Z _p , it is within the tolerance range, so the coordinate system setting data is shifted by △Z _pr . In this case, the tool 26 attached to the left tool rest 21 can be used to cut the end face.
_Wz2 is machined by turning, and the end face _Wz2 is measured by a touch sensor 27 attached to the turret 24 of the right tool post 20. Therefore, the right tool rest 20
Since the coordinate system setting data of the left tool rest 21 is shifted by ΔZ _pr , the coordinate system setting data of the left tool post 21 also needs to be shifted by the amount of ΔZ _pr . That is,
Let the mechanical origin of the left turret 21 be _nl , and the mechanical origin
From _nl to end face part W _z3 of workpiece W (program origin _pl )
If the distance to Z _pl is the previous coordinate system setting value Z _pl ′, then the shifted coordinate system setting value is Z _pl = Z _pl ′ + Z _pr
becomes.

The end face W _zp of the work W is shifted by ΔZ _pr , this position is set as the program origin _pl , and the touch sensor 27 measures position data Z ₁ and Z ₂ of the body W _z1 and the body W _z2 in the work coordinate system. do.

In addition, the coordinate values on the program from the program origin _pr in the body parts W _z1 and W _z2 of the workpiece W,
The tolerance values were previously set, Z ₁₀ , Z ₂₀ and △
Z ₁₀ and △Z ₂₀ are input.

Measured values Z ₁ , Z ₂ and program coordinate values Z ₁₀ , Z ₂₀
The difference values △Z ₁ and △Z ₂ are as follows: △Z ₁ =Z ₁ -Z ₁₀ △Z ₂ =Z ₂ -Z ₂₀ . Then, these △Z ₁ and △Z ₂ are compared with the respective tolerance values △Z ₁₀ and Z ₂₀ , and △Z ₁ > △Z ₁₀ , △Z ₂ > Z ₂₀
If so, an alarm signal is issued and a defect flag is set. Also, if △Z ₁ ≦△Z ₁₀ and △Z ₂ ≦△Z ₂₀ , a tolerance OK flag is set. ΔZ ₁ causes tool correction to be performed on the machining data of the right tool post 20. In addition, △Z ₂ is configured to emit and transmit a data set signal from the right tool rest 20, receive it as a data set signal to the left tool rest 21, and operate tool correction on the machining data of the left tool rest 21. do.

Next, the measuring means which is the main part of the present invention will be explained based on the control block diagram of FIG. In Fig. 4, the machining program data for the right tool post 20 is
It is input to the CPU 100 and temporarily stored in the R machining program memory 103 of the right tool post 20. In addition, the measurement operation program data of the touch sensor (TS) 27 is the R measurement operation program.
It is temporarily stored and stored in the memory 104. The previous coordinate system setting data Z _pr ' of the end face portion W _zp of the workpiece W to be machined is stored in the memory 107 . The first program coordinate value Z ₁₀ of the torso W _z1 and the torso W _z2
The second program coordinate value Z ₂₀ , the origin tolerance value ΔZ _p which is the respective tolerance value, the first program tolerance value ΔZ ₁₀ , and the second program tolerance value ΔZ ₂₀ are obtained from the screen keyboard 101, respectively. Input circuit 101
each memory 108, 109, 11 via a
0, 111 and 112.

Further, from the position control circuit interpolation path 102, which is a position sending means, the current value Z _n from the machine origin corresponding to the movement of the right tool post 20 is sent to the memory 113 and the work coordinate system current value from the program origin _pr .
Z _w is always read into the memory 114.

Right turret 20 R machining program memory 10
When the R program set data 115 is received from 3, it is transferred to the set circuit 152 of the left tool post 21.
If the L program data 154 is input, the L machining program data stored in the L machining program memory 150 is started by the set circuit 152, and the left tool rest 21 is operated.

When the L machining program set data 153 is received from the L machining program memory 150, it is transferred to the set circuit 106 of the right tool post 20, and if the R program holding data 116 is input, the R machining program is set by the set circuit 106. The right machining program data stored in the memory 103 is started and the right tool rest 20 is operated. Therefore, the R machining program and the L machining program are started in conjunction with each other.

First, place the touch sensor 27 on the end surface of the workpiece W.
By hitting W _zp , a W _zp touch signal is emitted,
The current value Z _n of the machine coordinate system current value Z _n stored in the memory 113 by this W _zp touch signal passes through the AND gate 117 and is stored in the memory 118 as the origin coordinate value Z _pr .

The previous coordinate system setting data Z _pr ' already stored in the memory 107 and the origin coordinate value Z _pr stored in the memory 118 are calculated by the calculation unit 119 as △Z _pr = Z _pr −
Performs arithmetic processing of Z _pr ′. The comparators 120 and 121 take the ΔZ _pr processed by the arithmetic unit 119 and the origin crossing value ΔZ _p stored in the memory 110, and the comparator 120 compares and determines ΔZ _pr ≦ΔZ _p . The comparator 121 compares and determines that ΔZ _pr >ΔZ _p .

If it is determined that △Z _pr > △Z ₀ , an alarm signal is output as it is outside the tolerance range, and an origin tolerance defect flag is set.

When the comparator 120 satisfies the condition △Z _pr ≦△Z _p , the bit signal causes the △
Z _pr passes through AND gate 122 and then passes through AND gate 124 according to the data set signal.
Send data to the control side of the left turret 21, and
It is input to gate 150.

ΔZ _pr processed by the calculation unit 119 is taken into the calculation unit 125 together with the previous coordinate system setting data Z _pr ′ stored in the memory 107, and Z _pr =
The arithmetic processing of Z _pr '+ΔZ _p is performed, and the value is again substituted and set in the coordinate system setting data memory 107. In other words, change the coordinate system setting from Z _pr ′ to _{Z pr}
Shift by minute.

After shifting the coordinate system setting data from Z _pr ′ to Z _pr by ΔZ _pr , the current value of the work coordinate system Z _w stored in the memory 114 can be changed by applying the touch sensor 27 to the body WZ ₁ of the work W. , and gate 126, and is stored in the memory 127 as the first measurement point coordinate value _Z1 .

The first measurement point coordinate value Z ₁ stored in the memory 127
and the first program coordinate value Z ₁₀ stored in the memory 108 are taken into the calculation unit 128, and ΔZ ₁
=Z ₁ -Z ₁₀ is performed, and the value of ΔZ ₁ and the first program tolerance value ΔZ ₁₀ stored in the memory 111 are taken into the comparators 129 and 130. The comparator 129 makes a comparative judgment of △Z ₁ ≦△Z ₁₀ , and if the condition of △Z ₁ ≦△Z ₁₀ is satisfied, a flag indicating that the first measurement point tolerance is OK is set. In addition, according to the bit signal, △ _Z1 from the calculation unit 128 passes through the AND gate 131, and is stored in the R tool correction data memory 10 as the R tool correction value of the corresponding R tool number.
5 is stored.

When the condition of △Z ₁ > △Z ₁₀ is met, the comparator 130
At the same time as issuing an alarm signal from the first measurement point, a defective flag at the first measurement point is set.

Next, the current value Z _w of the workpiece coordinate system stored in the memory 114 is determined by the AND gate 1 by applying the touch sensor 27 to the body W _z2 of the workpiece W.
32 and is stored in the memory 133 as the second measurement point coordinate value _Z2 .

Second measurement point coordinate values stored in the memory 133
Z ₂ and the second program coordinate value Z ₂₀ stored in the memory 109 are taken into the calculation unit 134 .

The arithmetic unit 134 performs arithmetic processing of △Z ₂ =Z ₂ −Z ₂₀ , and the value △Z ₂ and the second program tolerance value △Z ₂₀ stored in the memory 112 are used in the comparator 135.
and input into comparator 136. The comparator 135 makes a comparison judgment of △Z ₂ ≦Z ₂₀ and the comparator 136 makes a comparison judgment _of △Z ₂ ≦Z ₂₀ , and the comparator ₁₃₆ makes a comparison judgment that △Z 2 ≦Z ₂₀ .
A comparison judgment of ΔZ ₂₀ is made, and if the condition of ΔZ ₂ ≦ΔN ₂₀ is satisfied, a second measurement point tolerance OK flag is set. In addition, the bit signal causes the arithmetic unit 13 to
When △Z ₂ of 4 passes through the AND gate 137 and sets a flag indicating that the second measurement point tolerance is OK, and the AND gate 138 is opened by the data set signal S ₂ , the control section on the left tool rest 21 side is activated. Send data to AND gate 158.

When it is determined that ΔZ ₂ >ΔZ ₂₀ , an alarm signal is generated and a second measurement point defect flag is set.

The AND gate 124 of the control section on the right tool post 20 side described above transfers △Z _pr to the AND gate 155 of the control section on the left tool post 21 side, and upon receiving the data holding signal W _p , the AND gate 115 Open,
The previous coordinate system setting data Z _pl ' stored in the memory 157 is taken into the calculation unit 156. In the calculation unit 156, the calculation process of Z _pl = Z _pl ′ + △Z _pr is performed, and the processed Z _pl is substituted into the coordinate system setting data memory 157, and the coordinate system setting is performed.
It is shifted from Z _pl ′ to Z _pl by ΔZ _pr .

Also, the AND gate 1 of the right tool rest 20 control section
38 to △Z ₂ is the AND of the control section of the left turret 21.
It is transferred to the gate 158, and upon receiving the data wait signal _W2 , the AND gate 158 opens, _ΔZ2 passes through, is substituted into the tool correction value memory 159, and is set as the tool correction value for the corresponding L tool number. It is temporarily stored in the tool correction data memory 151.

Although the above description has been made regarding the Z coordinate system, the same procedure can be applied to the X coordinate system.

Therefore, the greatest feature of the present invention is that the touch sensor 27 of the right tool rest 20 measures the measurement data, and the measured data is transferred to the control section of the left tool rest 21 for data processing.

Next, the operation of the present invention will be explained based on the flowchart of FIG.

In FIG. 5, the right tool rest 20 and the left tool rest 21
Start the machining programs at the same time. The operation is started based on the machining program data of the right tool rest 20, and in the first step, it is determined whether it is a measurement operation or not. If it is not a measurement in the first step, return. When it is determined that a measurement operation is to be performed in the second stage, the touch sensor 27 of the measurement probe is transferred in the second stage.

In the second stage, the position sending means 102 starts the Z-axis (W ₂₀ ) coordinate system setting operation. In this stage, the arithmetic processing shift amount ΔZ _pr is determined by the arithmetic units 119 and 125.

In the second stage, it is determined by the comparators 120 and 121 whether the shift amount ΔZ _pr is within the tolerance range, and if it is outside the tolerance range, a defective origin tolerance flag is set in the second stage and the process ends. If it is within the tolerance range, the process proceeds to the first stage and data transfer processing for the shift amount ΔZ _pr is performed. The machining control section of the left tool rest 21 issues a data waiting signal as the first step while the control section of the right tool rest 20 is performing the processing of the first to third stages.
Therefore, by data transfer of △Z _pr in the second stage, the data of the shift amount △Z _pr is received in the second stage, and the coordinate system setting of the Z axis is changed from Z _pl ' to Z _pl in the calculation unit 156.
Shift by △Z _pr by the calculation process. After that, in the second stage, a data waiting signal (ΔZ ₂ ) is issued and the controller waits for data to be transferred from the control section of the right tool post 20.

The control section of the right tool post 20 advances from the first stage to the second stage and shifts the Z-axis coordinate system setting from Z _pr ' to Z _{pr by Z pr by} the calculation process of the calculation section 125.

In the second stage, the Z widths (Z ₁ , Z ₂ ) of the body parts W _z1 , W _z2 of the workpiece W are measured using the touch sensor 27 . In the second stage, the calculation units 128 and 134 perform calculation processing, and in the second stage, the comparators 129 and 130 compare and determine whether ΔZ ₁ is within the tolerance range. If the value of ΔZ ₁ is outside the range of tolerance values, a tolerance defect flag is set at the first measurement point (W _z1 ) in the second stage.

If the value of △Z ₁ is within the tolerance value range, the first measurement point tolerance OK flag is set in the first stage, and △
Output Z ₁ as the tool correction value of the corresponding R tool number.

In the second stage, comparators 135 and 136 compare and determine whether ΔZ ₂ is within the tolerance range. If the value of ΔZ ₂ is outside the range of tolerance values, a tolerance defect flag is set at the second measurement side point (W _z2 ) in the second stage. If the value of ΔZ ₂ is within the tolerance value range, a flag indicating that the second measurement point tolerance is OK is set in the second stage.

In the second stage, the data of the tool correction value (ΔZ ₂ ) is transferred to the control section of the left tool rest 21, and the control of the right tool rest 20 is completed.

The control section of the left tool post 21 receives the tool correction value (△Z ₂ ) from the control section of the left tool post 21 at the first stage, since the data waiting signal (△Z ₂ ) is issued in the second stage. Then, it is substituted as the tool correction value (LZ _pfo ) of the corresponding tool T-No in the memory 159 (step 1), and the L tool correction data memory 151
Store it in and exit.

By repeating the above operation, each work W
measurement processing is performed.

(7) Effect The present invention performs turning processing using a plurality of tool posts, and measurements are performed using a touch sensor as a measuring means attached to the turret of one tool post, and coordinate system setting data and tool correction values are added to the measurement results on one side. Since the data is transferred from one tool post control section to the other tool post control section, the effort and time during measurement is greatly reduced, and the tool correction values for each tool post are automatically processed. Predetermined workpiece processing is automatically performed without waste.

[Brief explanation of drawings]

FIG. 1 is a front view of an NC lathe having multiple tool rests to which the present invention is applied, and FIG. 2 is a side view taken in the direction of arrow I in FIG. FIG. 3 is a diagram showing the principle of processing the body width of a workpiece W and measuring it with the measuring means of the present invention. FIG. 4 is a block diagram illustrating the measuring means of the present invention. FIG. 5 is a flowchart illustrating the operation of the measuring means of the present invention. 2... Headstock, 3... Main spindle, 10... Tailstock, 12... Tailstock shaft, 20... Right turret, 21
...Left turret, 24, 25...Turret, 26...
...Tool, 27...Touch sensor, 100...
CPU, 101...Keyboard with screen, 102...
...Position sending device, 103...R machining program・
Memory, 104...R measurement operation program memory, 105...R tool correction data memory, 10
9, 125, 128, 134, 156... calculation section, 120, 121, 129, 130, 134,
135...Comparator, 150...L machining program memory, 151...L tool correction data memory.

Claims (1)

[Claims] 1. In an NC machine tool equipped with two turrets movable in two orthogonal planes to process a single workpiece, the apparatus is mounted on one of the two turrets. , a measuring means for measuring the end of the workpiece and calculating the distance from the origin in the rotational axis direction of the workpiece; an input means for setting a reference value and its tolerance for a machining location of the workpiece; a first coordinate system setting data means for setting machining coordinate values of the tool rest; a coordinate value data means for measuring a machining location after machining the workpiece with the measuring means and storing the value; and this coordinate value data. a first calculation means for calculating a difference value between the means and the first coordinate system setting data; and a comparison means for comparing the difference value calculated by the first calculation means with a preset reference tolerance. , When the difference value is smaller than the tolerance value and satisfies the machining continuation condition after comparison by the comparison means, the difference value obtained by the first calculation means is transferred to the first coordinate system setting data means. a second calculation means for transferring and performing calculations for rewriting data; a second coordinate system setting data means for setting for processing the other of the two tool rests; a third calculation means that performs a correction calculation to transfer the difference value obtained by the first calculation means for processing the other tool post and rewrite the data of the second coordinate system setting data means; a tool correction data means for storing the difference value obtained by the first calculation means as a tool correction value of the other tool post; and a correction determined by the data measured by the measurement means, preset reference data, and the calculation means. It consists of a central control means that performs numerical control by transferring data between the above-mentioned means, and based on the measurement data of one of the turrets, the correction value based on this measurement value becomes the correction value of the other turret. A measuring device for multiple tool turrets, characterized in that the coordinate system setting data of both tool turrets can be corrected using the same correction value.