TW524725B - Method and device for main shaft synchronous control - Google Patents

Abstract

main spindle synchronous control device is adapted to control the speed of main spindle induction motor 130a which drives a main spindle 1004 holding a work 1003, and also to control the speed of rotary guide bush induction motor 130b which drives rotary guide bush 1005 guiding the work 1003. The main spindle synchronous control device includes a main spindle speed correction computing device 41 for computing a rotational speed command for the rotary guide bush induction motor 130b according to the gap between the work 1003 and the rotary guide bush 1005, and a rotational speed data conversion device 44 for controlling the rotary guide bush induction motor 130b with the rotational speed command computed by the main spindle speed correction computing device 41 as a rotational speed command for the rotary guide bush induction motor 130b, so that excessive heat will not be generated by a large amount of current flowing through the motor for driving the rotary guide bush when cutting the work having a shape equivalent to a round rod material.

Description

524725-V. Description of the invention (1) [Explanation of the invention] 1 Technical field of the invention]-The present invention relates to a method and a device for synchronously controlling a spindle, which are _synchronously controlling a spindle and a guide sleeve shaft of an automatic lathe and the like. [Prior Art] The prior art will be described with reference to FIGS. 10 to 15. Figure 10 shows the main part of the numerical control device, which is equipped with a spindle synchronization control device to synchronously control the spindle motor (hereinafter referred to as the side spindle motor) used to drive the spindle of the automatic lathe, and to drive the rotary guide sleeve The spindle motor of the shaft (hereinafter referred to as the rotary guide bushing shaft motor). Fig. 11 is a structural diagram of an automatic lathe of a machine tool; Fig. 12 is a detailed structural diagram of a center spindle and a rotary guide bush shown in Fig. 11; Fig. 13 is a diagram showing control of rotation and stop of a spindle motor Fig. 14 is a timing chart showing the change of the guide sleeve shaft motor current during actual cutting; Fig. 15 is a sectional view showing the positional relationship between the rotating guide sleeve and the circular workpiece. In Fig. 10, 1 coefficient control device, 2 series processing program, 3 series processing program analysis processing section, 4 series interpolation processing section, 5 series control circuit, 6 series mechanical control signal processing section, 7 System memory, 8 series parameter setting section, 9 day surface display section, 10 a series spindle control section (hereinafter referred to as the spindle control section), 1 Ob series rotary control sleeve axis control section (hereinafter referred to as the guide sleeve) Axis control part), 1 1 series data input / output circuit, 1 2 a series spindle amplifier (hereinafter referred to as spindle amplifier), 1 2 b series spindle amplifier for rotating guide sleeve shaft (hereinafter referred to as guide sleeve shaft amplifier), 1 3 a is the spindle motor of the main t-axis (hereinafter referred to as the spindle motor), and 1 3 b is the spindle horse of the rotating guide sleeve shaft

313583.ptd Page 6 524725

V. Description of the invention Wheel motor ((2) Rotary guide bushing shaft motor is hereinafter referred to as Figure Π and Figure 12, 1000 is the frame of automatic lathe machine, 001 is the tool for cutting the workpiece described later, 1 0 0 2 is used to hold the tool 1 0 0 1 /, holding wood, 1 QQ 3 series of workpieces, which are composed of a long circular metal = bar called bar, 丨 0 0 4 series spindle, 1 〇 〇5 series rotary guide sleeve, 〇06 series pulley, which are installed on the shaft end of the rotary guide sleeve shaft motor 13b, and 〇07 series timing belt. Next, the spindle motor 13a and the rotary guide sleeve shaft motor will be described. 13b spindle synchronous control action. A long workpiece 1003 is fixed by the chuck (not shown) of the spindle 10Q4 and the rotary guide bushing 105. The workpiece 1003 is relative to the spindle 10. 〇4 rotation, order and rotation, and move from right to left with a command relative to the Z axis, and hunting the tool 1 〇2 for up and down to perform the turning process. At this time, control the rotation guide 1005 and the spindle 10 04 synchronous rotation. As shown in figure n, the coordinate system of the automatic lathe is set to its normal left and right direction 2 axes, the up-down direction is X-axis' and the cage 10 is limited to move in the χ-axis direction. As shown in Figure 12, for example, the main shaft 1004 is formed by the main shaft motor 13 & itself, which is the main shaft. The speed ratio of 1 0 04 to the spindle motor 13a is i · 1. The rotary guide bushing 1 0 5 is connected to the pulley 1006 by a timing belt 1007, and is rotated by the rotary guide bushing shaft motor 13b. Drive. For convenience of explanation, the pulley ratio (gear ratio) of the rotary guide bushing 105 and the rotary guide bushing shaft motor 13b is set to 1: 1. That is, the rotary guide bushing shaft motor 13b and the spindle motor are controlled When 13a rotates synchronously, the rotary guide sleeve 105, the spindle 1004, and the circular workpiece 1003 fixed by the spindle chuck will also rotate synchronously.

313583.ptd Page 7 524725 • V. Description of the invention (3) Turn. • The processing program that drives the part driven by the spindle motor shown in Fig. 13 where the command M3 is the rotation start command of the spindle motor 13 & the command S1 is the speed command of the spindle motor 1 3 a (at this time it is based on (1000 rpm rotation), and the command M5 indicates a rotation stop command of the spindle motor 13a. The main shaft motor 13a and the rotary guide bushing shaft motor 13b are previously set to rotate constantly in synchronization with parameters. The processing program read by the tape drive etc. is stored in the memory 7. When the processing program 2 is executed, the processing program 2 is read and stored in each block of the memory 7 to read the processing program 2, and the read H d #processing program analysis processing section 3 performs processing. Qiao 2 Take the processing program in Fig. 13 as an example for explanation. The processing unit 3 reads the rotation start finger of the spindle motor 1 a from the memory 7 and the speed analysis instruction s 1 in the human analysis unit. These read out instructions are in the processing program solutions 90M3 and 3, and it is judged that the circuit of the finger handling unit of the control circuit 5 should be notified to the rudder circuit 5 which describes the mechanical control signals such as the switch of the cutting oil. The analysis result is notified to the mechanical control signal processing unit 6. The mechanical protection control and processing unit 6 converts the notified analysis result into a mechanical control signal T signal to the control circuit 5. The control circuit 5 determines whether the spindle motor 1 3a is U ， 'And round out— If it is in a rotatable state, the rotation start signal can be rotated and spring ^ S 1 is output as the speed data to the mechanical control signal processing section f. And the turning finger is input to the mechanical control signal processing section The rotation starting motion data of 6 will be transmitted to the interpolation processing unit 4. The interpolation processing unit and the speed data are converted into the rotation position command of the main shaft 13a. Also, ^, will rotate 1 3a and the rotary guide sleeve shaft motor 1 The flutter system is based on the parameter spindle motor ° and 经常 as a constant synchronization. 524725 V. Description of the invention (4) ~~ Control, so for the rotating guide sleeve shaft motor 13b, the rotation can also be calculated by the spindle motor. Rotary position command of the sleeve motor 13b. ^ The rotational position command of the motor 1 3a and the rotary guide shaft motor i 3 b are output from the eight axes to the main shaft control section 10a and the guide shaft control section 丨 0b. 'Rotary position commands such as the knife wheel are in accordance with the acceleration and deceleration mode preset in the spindle control department worker 〇a guide> 10b, and the servo position instructions in each unit are recalculated and output to the data output. The input circuit 1 1 D 誃 and the intermediate position command are transmitted to the main server 12a and the guide sleeve shaft amplifier 12b through the data input and output circuits. The amplifier spindle amplifier 12a and the guide sleeve shaft amplifier 12b are respectively according to the service position instructions. Control the position of the spindle motor 3a and the rotation servo and make it rotate. At this time, due to the corresponding spindle motor 13a to ii13b, the MOA and the corresponding guide bushing motor of the guide bush shaft Ub have been adjusted to the same mode. The rotation speed of the industrial guide 〇10b and the rotary guide bushing 105 are changed: the main part is moved, and the workpiece is executed to indicate the center spindle rotation y ,,,, = step rotation. The engineering-type analysis processing unit 3 through When M5 is used, add Out to the control circuit 5 .: The mechanical control signal processing unit e rotates the analysis result to the rotation start signal. Mechanic 1] Circuit 5 receives the rotation stop command M5, and after the shutdown number is turned off, it rotates I 玉 = 仏 # processing unit 6 In the rotation start letter processing unit 4, a stop command for the host vehicle is transmitted to the interpolation processing unit 4. The finger control 4 1 0 a which interpolates the rotation speed command 0 and the rotation guide shaft control unit 1 0 The instruction under b is in accordance with the preset acceleration and deceleration mode control section 1 a and guide shaft control section 1 〇 b ^ recalculated at the servo position and output it.

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313583.ptd 524725 V. Description of the Invention (5)-The heart access circuit 1 1. The servo position command is transmitted through the data input / output circuit 11 to the main shaft Al§ 12a 'and the guide sleeve shaft amplifier 12b. These spindles put Λ benefit 12a and guide bushing shaft amplifier 12b according to the current value of Zhaozhaogu / North Eight Motor 1〃3 & synchronize with the suspected guide bushing shaft motor 3b and decelerate and rotate the guide bushing shaft motor 131) ' , As shown in Figure U. In other words, when rotating at a variable speed during rotation and guide cutting, the front wheel motor 13b cuts the workpiece with a fixed current required as the current i to make the rotary guide 1005 rotate at the moment = flowing through the rotary guide shaft The motor 13b. For example, the electric power from the rotary guide bushing shaft motor 13b is fixed until the cutting result ^ is gradually increased to the current value I 2. The current value I 2 will be small, and will return to ^ tick t2. After cutting, the current value will decrease again. Figure 15 shows the current value II required for the guide bush to rotate 1 0 5. The cross-sectional view of the system, the position of the rotary guide bushing 105 and the circular workpiece 1 003 is close to the circular workpiece 1003. The inner diameter of the rotary guide bushing 005 is set to D2, and the circular workpiece 100 is set. When the conversion of 3 is set to D1 ', usually the rotating guide sleeve 1005 is Dg, and there is a gap (D2-D1) between the circles. When the clearance is defined as Dl = Wd, and the diameter of the shaped workpiece 1 0 0 3 is defined as Wd, then the direction f of the arrow A is directed. At this time, the main shaft 1004 clamps the circular workpiece 1003 and the rotative guide sleeve 1⑽5 of _ 〇 0 4 is also clamped to the main shaft. At this time, it rotates from ^ 03 in the direction of arrow A synchronously. The outer diameter part is in contact with the inner diameter part of the guide bushing 1 0 0 5 and the workpiece 1003 of the round workpiece 1 0 3, and the gray diameter is rotated. Therefore, the inner diameter part of the guide bushing 1005 and the round part The contact point C of the shaped workpiece 1 03 " quot " will move with the rotation of the guide bush 1005 and the circle. Suppose the inner diameter part of the rotating guide sleeve 〇〇〇 5 and

3l3583.Ptd

Page 10 524725 V. Description of the invention (〇 '~' — ~~~ --—— _ Ξ = 2 t 1 0 0 3? There will be no sliding between the diameter parts' When the circular workpiece 1 0 0 3 spin The difference is just that, the inner diameter of the rotating guide sleeve 1 0 05 and the round workpiece 1 0 3 ^ 10 03, that is, there is a gap, which will make the rotating guide sleeve 1 0 0 5 and circular The contact point of the work becomes: r (D2_D1), that is, the delayed redundant Dg2D point. Spot = ,; rDg is equivalent to the distance between point C and point D. However, due to the rotating guide sleeve 'ι〇〇5 Γ〇05 fish workpiece The frictional resistance at the contact point of the 〇03 is small. Actually, the guide sleeve 1 will rotate between 10 and 3, and sliding will occur appropriately. Therefore, when the circular workpiece I makes one turn, the guide sleeve 1 is rotated. 0 0 5 will be located at point c instead of point D. In this state ~, in order to rotate the rotary guide sleeve shaft motor 13b, no large current is required. = Round workpieces due to turning, etc. When cutting f in the direction of the arrow E, the frictional resistance at the contact point will increase, and the rotating guide sleeve 1005 and the circle: 4 1 3 will not easily slip. At this time, the circular workpiece 1 1 rotates 1 During the circle, the rotating guide sleeve 〇〇〇5 will be located at point D However, because the rotation command position relative to 0 is point C, the rotary guide bushing shaft motor = the frictional resistance generated by the cutting load over the sleeve is positioned at point C, and torque will be generated. In this way, every time the spindle motor 13a rotates, it contacts Point D will move in the direction of arrow B and the difference between command position c will gradually increase, that is, the rotary guide bushing shaft motor 13b must generate a larger torque. When the rotary guide bushing shaft motor Ub generates a larger torque, The newly generated torque will exceed the frictional resistance generated by the cutting load, so a slip will occur between the rotary guide bushing 005 and the circular workpiece 丨 003, thereby bringing the contact point back to the direction of point C. By By repeating the above actions, a larger current will flow in the rotating guide sleeve shaft motor 3b than in non-cutting.

313583.ptd Page 11 524725 V. Description of the invention (7) In the conventional numerical control device, when the workpiece 10 was a circular workpiece, it was distributed to the rotary guide sleeve shaft motor used to drive the rotary guide sleeve 1 3 The current of b will increase during the period from the beginning of cutting to the end of cutting. Therefore, the rotary guide bushing shaft motor 13b will generate heat, and the generated heat energy will be transmitted through the timing belt 1007 or air; The guide bush 1005 is heated, which causes problems such as a deterioration in machining accuracy of the workpiece 103. The countermeasures are described in, for example, Japanese Patent Laid-Open No. 1 0-3 44 0 1, and the rotational position command of the rotary guide sleeve shaft motor 13 b is calculated based on the amount of gap generated between the workpiece 1003 and the rotary guide sleeve 1005. Correction Lu 'and use the correction of the correction amount relative to the rotation position command of the spindle motor 1 3 & as a rotation position command of the rotation guide sleeve shaft motor 13b to prevent the circulation of the rotation guide The current of the sleeve motor 13b increases during the period from the start of cutting to the end of cutting, and reduces the heat generation of the rotary guide shaft motor 13b. However, the invention described in Japanese Patent Application Laid-Open No. 10-344〇1, because the spindle motor 13a and the rotary guide bushing shaft motor i3b are driven by the rotational position command, and the corrected rotation is issued to the rotary guide bushing shaft motor 3b. Position command, therefore, the premise is that the spindle amplifier and main bean that can control the position must be constructed and processed more complicated. "• So it is suitable for cheap lathes, with simpler handling and cheaper [Overview of invention]

313583.ptd Page 12 524725 V. Description of the invention (8) Inexpensive devices such as spindle amplifiers and spindle motors, and inexpensive devices such as inverter devices and induction motors can be used. Another object of the present invention is to provide a method and a device for synchronously controlling the main shaft without requiring the operator to specifically measure the gap between the workpiece and the rotary guide sleeve. According to the present invention, the contact position between the workpiece and the rotating guide sleeve that guides the workpiece is often at the same position, and the rotation speed command of the guide sleeve shaft motor is calculated according to the amount of space generated between the workpiece and the rotating guide sleeve that guides the workpiece. In the invention, the contact position between the workpiece and the rotary guide sleeve that guides the workpiece is often in the same position. According to the amount of the gap between the workpiece and the rotary guide sleeve that guides the workpiece, the speed command of the spindle motor is corrected, The corrected speed command is used as the speed command of the guide shaft motor. The present invention changes the speed command to reduce the current value of the guide sleeve shaft motor during cutting, and uses the speed instruction when the current value becomes a predetermined current value as the speed instruction of the guide sleeve shaft motor. The present invention pre-stores the current value of the guide bushing shaft motor during non-cutting, and uses the rotation speed command when the current value of the guide bushing shaft motor during cutting and the pre-stored current value become substantially the same as the guide bushing shaft motor. Speed command. The invention is provided with a spindle speed correction calculation mechanism, which is to make the contact position of the workpiece and the rotary guide sleeve that guides the workpiece is often in the same position, and calculate based on the amount of gap generated between the workpiece and the rotary guide sleeve that guides the workpiece. The speed commander of the guide sleeve shaft motor. The invention is provided with a spindle speed correction calculation mechanism, which is to make the contact position of the workpiece and the rotary guide sleeve that guides the workpiece is often in the same position, and according to the gap generated between the workpiece and the rotary guide sleeve that guides the workpiece

313583.ptd Page 13 524725 V. Description of the invention (9) Correct the speed command of the spindle motor, and use the corrected speed command as the speed command of the guide shaft motor. _ The present invention is provided with: a memory, which stores a predetermined current value of the guide shaft motor in advance; and a correction spindle speed determination mechanism, which uses the current value of the guide shaft 1 motor during cutting and the pre-stored in the memory The current value actually becomes the same rotation speed command as the rotation speed of the guide sleeve shaft motor. In the present invention, the current value stored in the memory is the current value of the guide sleeve shaft motor during non-cutting. • The present invention stores the rotation speed command of the guide shaft motor determined by the correction spindle speed determination mechanism in the memory. [Best Mode for Carrying Out the Invention] Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 5 and 15. Fig. 1 is a block diagram of the main part of the number-value control device 1 provided with the spindle synchronization control device in the first embodiment; Fig. 2 is a view showing the parameter setting day surface of the numerical control device 1; Fig. 3 is before processing Diagram of the work flow of the operator; Figure 4 is a flow chart for controlling the rotation of the guide sleeve shaft induction motor at an appropriate speed based on the set gap amount; Figure 5 shows the guide sleeve in this first embodiment The non-cutting / cutting current state of the shaft induction motor 1 3 Ob; and FIG. 15 are cross-sectional views of the positional relationship between the circular workpiece when it is inserted into the rotary guide sleeve. Figure 1 shows the same or similar parts as the conventional examples with the same symbols

313583.ptd Page 14 524725 V. Description of the Invention (41) Of the 4 1 series spindle speed correction calculation mechanism, 4 4 series speed data conversion mechanism, 1 0 1 analog data output circuit, 1 2 0 a spindle An inverter device, an inverter device for a 102b-based guide sleeve shaft, an induction motor for a 130a-based spindle, and an induction motor for a 130b-based guide sleeve shaft. In the parameter setting screen shown in Figure 2, its display title is "Preparation parameters", and the setting of data is performed in the "# () 信息 ()" part at the bottom left of the screen. The menu at the bottom of the screen is useful to select the title of the screen display "Basic 1, Basic 2, Preparing Parameters, Zeroing, Servo". There are two parameter items displayed on this screen. The parameter value of "Workpiece Dimension" is "2 0", and the parameter value of "Guide Sleeve Amount" is "0. 0 2". The setting value is determined by the parameter setting section. 8 is stored in memory 7. Next, the flow of the operator before processing will be described with the flowchart shown in FIG. 3. In step 1, the operator uses a micrometer or the like to detect a gap amount between the rotary guide bushing 1005 and the circular workpiece 1003 as shown in FIG. 15. In step 2, the gap amount measured in step 1 is set in the parameter setting of the "preparation parameters" shown in Fig. 2 as the "guide sleeve gap amount" item on the day surface, that is, the value of Dg is set. In the example, it is set to 0.02 mm, and at the same time, the "workpiece external dimension" is set, which is 20 mm in this example. In step 3, the operator turns off or sets the signal of a special-shaped workpiece (such as a bar with a regular hexagon profile) to invalid. The special-shaped workpiece signal can be set as a switch of the mechanical operation panel, or it can be set in the setting screen of the numerical control device 1. The reason for setting the special-shaped workpiece signal is based on the instruction of the induction motor 1 30b for the rotating guide sleeve shaft.

313583.ptd Page 15 524725 V. Description of the invention (11) In the case of the correction of the main shaft and the rotation time, due to the correction, the induction induction motor 130b for the main shaft will react to each other and cause torsion; 130a or the motor used to rotate the guide bushing shaft) will continue to produce excessive torque problems. Therefore, it is necessary to judge the insert or round workpiece in advance. Secondly, according to the flow chart in Fig. 4, the clearance of Xin t is used as the flow of the guide shaft at an appropriate speed. In step 10, the spindle speed is corrected for the set workpiece signal. Alien performs any processing and ends processing. Alien Steps 1 1. y In step 11, the data stored in the memory 7 in the guide sleeve spindle speed-step 2 ("0" enters step 12; "〇" enters the mechanical control number and speed data in step 12 to the inside) Insertion speed data is converted into induction motor 130a for the main shaft induction motor and the rotary guide. Parameters are preset to be synchronous motor 130b at any time. Special-shaped workpiece motor 130a and the rotary guide shaft are also inserted between the main shaft induction guide bush. If the inserted special-shaped workpiece is grainy and cannot be twisted with ', the spindle induction motor 1 3 0 b (outputs a small moment and causes the load to exceed the load warning and enters the rotating guide sleeve as a special-shaped workpiece. The flow shown is to set the rotation speed control of the induction motor 130b to 50 different mechanisms 41 to check in step 3 when the workpiece signal is on, when the workpiece signal is not required to be turned off, enter the step correction differentiating mechanism 41, and read the step. The amount of the guide sleeve gap), if the setting value is outside, proceed to step 13. The rotation start processing unit 4 is controlled from the 5 tiger processing unit 6, and the rotation speed of the motor 130a is commanded in the interpolation processing unit 4. Because of the main sleeve For shaft Induction motor 13〇b is a control system, and the rotational speed data of the induction motor 1 30 a for the rotating guide bushing shaft 纟

313583.ptd Page 16 524725 V. Description of the invention (12) Calculate the rotation speed instruction of the induction motor 130b for the rotating guide sleeve shaft. The rotation speed command of the induction motor 130a for the main shaft and the induction motor 13 Ob for the rotary guide sleeve shaft is converted by the speed data conversion mechanism 44 into a voltage command that is transmitted to the inverter device 1 2 0 a and 1 2 0 b. . The specific method is described below. The maximum speeds of the induction motors 30a and 130b (for example, 5000 rpm) to be controlled are set in advance to the inverter devices 120a and 120b. In this setting, the inverter device can usually rotate the induction motor with an input voltage of 10V and a maximum speed of 5000 rpm. Next, the rotation speed data conversion mechanism 4 4 converts the rotation speed command calculated by the interpolation processing unit 4 into a voltage command. For example, when the rotation speed command is 1 0 0 0 r pm, the voltage command becomes 10 (V) x 1 0 0 0 / 5 0 0 0 2 2 (V). The voltage command converted by the rotation speed data conversion mechanism 44 is output to the analog data output circuit 101. In the analog data output circuit 101, the voltage command input from the rotation speed data conversion mechanism 44 is output to the inverter devices 120a and 120b as the actual voltage, that is, the analog voltage. In the first embodiment, the voltages of the inverter devices 120a and 120b are 2V, and the inverter devices 120a and 120b detect the applied voltage output from the analog data output circuit 1 0 1 at a corresponding speed (1 in this example). 〇〇〇r pm) Control the induction motor 130a and 130b, and then finish the process. The description of step 13 is shown in Fig. 15. Because the contact point of the rotating guide bushing 1005 and the circular workpiece 1 03 should be the same as the contact point before the rotation, the rotating guide bushing 1005 The speed of the inner periphery and the outer periphery of the round workpiece in 2003 must be consistent. The formula is shown in equation (1). hx Sgx (Wd + Dg) / 60 = 2; rx Smx Wd / 60 (1)

313583.ptd Page 17 524725 V. Description of the invention (13) A '-" ~~ The left side of the equation indicates the speed (seconds) of the inner circumference of the rotary guide bushing 105, and the right side represents the circular workpiece 1 0 0 3 peripheral speed (revolutions / second / _). Sg is the rotation speed (rpm) of the rotating guide bushing 105, Sm is the rotation speed (rpm) of the round workpiece 10, Wd is the outer dimension (long) of the round workpiece, and the rotation guide bushing 1 0 05 and Clearance (mm) of round workpiece 1 00 3, square light type >

(1) can also be transformed into equation (2). I

Sg (rpm) 2 Wd / (Wd + Dg) x Sm (2) The spindle speed correction calculation mechanism 41 reads the data stored in the memory 7 in step 2 ^ data (outside dimensions of the workpiece, and the rotating guide sleeve 〇〇〇 05 and the circle After forming the workpiece 1 0 ″ and two clearances i), calculate the speed of the rotating guide bush shaft sensing application motor 1 3 0 b according to equation (2). The calculation application of the specific example is as follows. At this time, to make the calculation simple, Set the gear ratio (belt ratio) of the rotary guide sleeve 1005 to the rotary guide sleeve shaft induction motor 130b to 1 :; [, and set the gear ratio of the main shaft 1004 to the main shaft induction motor 130a to 1: 1. Because "Because the rotation speed of the induction motor 130b for the guide sleeve shaft, Sm. Is the rotation speed of the induction motor 130a for the spindle, so when Wd = 20mm, Dg = 〇 · 〇2mm, and -Sm = 5000rpm, the rotation guide The rotation speed of the sleeve induction motor 13〇1) is Sg = 20 / (20 + 〇 · 〇2) χ 5000 = 4995 (rpm). In step 14, the spindle speed correction calculation mechanism 41 calculates the result calculated in step 13. The speed data conversion mechanism 44 converts the result into a voltage command, and further, the analog data output circuit 1 〇1, the analog data is 9 volts " Output & Set to 120b for inverter guide shaft. The voltage of the above example refers to ^ 10 (V) x 4995/5000 and 9 · 990 (V). Inverter device 120b for rotary guide sleeve shaft

313583.ptd p. 18 ^ / 25 rpm. The voltage of 180 ° causes the induction motor 130b for the rotating guide sleeve shaft to rotate in response to the thunder gas. The induction motor 130b for the sleeve shaft will rotate at the slow speed of the main shaft sensor 130a. J ^ above M 1 Γ: Ding η ,. In the illustration, the contact point C of the inner diameter portion of the rotating guide sleeve 1005 and the round piece 1 0 3 is not equal to the contact% h after one rotation, as described above, . 1) 0, but the rotation speed of the rotating guide sleeve 1005 is also calculated by the above formula (2): salmon & rotation, that is, the rotation speed of the rotating guide sleeve 1005 is higher than the shoes of the circular workpiece 1 0 0 3, $ ... ~ It is slow, so the relative relationship between the inner diameter portion of the rotating guide bushing 005 and the circular workpiece 1a but the contact point of pk4 is the same. gp I 11 Rotating etc. When a circular workpiece 1 0 3 is subjected to a cutting load, the induction motor for rotating the guide sleeve shaft does not generate excess torque, that is, as shown in Figure 5, the rotating guide sleeve The current of the induction motor 130b for the shaft is 11 during cutting (period t1 to t2) and non-cutting. Therefore, the heating of the induction motor 130b for the rotating guide sleeve shaft will be generated during cutting and non-cutting. not changing. Embodiment 2 Next, Embodiment 2 of the present invention will be described with reference to Figs. 5 to 9. In the second embodiment of the present invention, when the gap amount cannot be measured, the rotation speed of the rotary guide sleeve shaft motor is controlled to an appropriate rotation speed. Fig. 5 is a diagram showing the current in the non-cutting / cutting state of the rotary guide bushing induction motor 1 3 b after the second processing of the second embodiment of the present invention; Fig. 6 is a diagram of a spindle synchronization control device The block diagram of the main part of the numerical control device 丨 Figure 7 is to control the rotation of the rotary guide bushing shaft motor 13b to increase the rotation current of the rotary guide bushing shaft motor 13b.

313583.ptd Μ page 19 524725 — ~~ ------ • ^, description of the invention (15) mm i i, —-7x% brother (15) -----

π out of the appropriate speed ~, ... Ding '' Timer diagram of the current change of the motor 1 taxi 77 taxi: 2 [9 figure shows the serial number, block number, slave guide sleeve shaft motor 1 in actual cutting. The lightning speed of 3b, and the rotation speed of the β Γ transduction sleeve motor 13b are stored in the memory 7, for example. The block diagram of Figure 6 is the same as or similar to the conventional example, with a number of 矣; · ν, / 19 after 19 to modify the main I * 祜 critical a 丄. J speed flow chart; Figure 8 is red The guide bushing shaft motor 13b calculates the appropriate rotation speed by the first operation, and rotates the guide bushing shaft motor Ub; \ plus the electric current change, a dimming _; and Fig. 9 is the second one—M 日 inch / Pain is the same or similar part with the same capital, 42 series of correction spindle speed determination mechanism, and 43 series of electricity production change detection mechanism. The processing ratio of the machine is set to 1: The first operation is set to 1 ... 1. The flow chart in FIG. 7 is used to explain the same as in the first embodiment. The gear rotating guide sleeve and the rotating guide sleeve of the spindle and the spindle motor 13a are the same as in the first embodiment. The gear ratio of the shaft motor 13b is also ^ In step 20, the correction of the spindle speed determination mechanism 42 checks the abnormal workpiece = 旒, when the signal of the abnormal workpiece is on, the processing is ended without any processing; when the signal of the abnormal workpiece is off, enter Step 21. In step 21, the rotation start signal of the mechanical control signal processing section 6 is transmitted to the interpolation processing section 4. In the interpolation processing section 4, the rotation and data are changed to the rotation speed instruction of the spindle motor 13a. . Because the spindle motor 13a and the rotary guide sleeve shaft motor 13b are preset to be synchronized and controlled at any time with parameters and the like, for the rotary guide sleeve shaft motor 3b, the rotation guide is also calculated from the rotational speed data of the spindle motor 1 3a. Sets the rotation speed command of the motor 13b. The rotation speed commands of the spindle motor 13a and the rotary guide sleeve motor 1 3b are output to the spindle control portion 10a and the guide sleeve shaft control portion 10b, respectively. These speed instructions are provided in the main shaft control section 103 and the guide bush shaft control section 10b.

524725 5. In the description of the invention (16), ‘as a step-like instruction is input to the consulting 丨 speed instruction through the data input / output circuit 1 丨,’ eight] access circuit 11. The rotations 12a and the guide shaft amplifier 121). The tool is transmitted to the spindle amplifier. The spindle amplifier 12a and the guide sleeve shaft speed command respectively control the spindle motor 3a and guide two, and rotate according to the received rotation. Since the data input / output circuit 11 in this structure is connected to the spindle amplifier 12a and the guide bush shaft amplifier 12b using serial communication, the interpolation processing unit 4 can connect the spindle amplifier 12a and the guide bush. The data of the shaft magnification cry, such as the actual speed and current value, is obtained through the data input / output circuit 11 and the shaft control unit 10 a and 1 Ob. In step 22, the current change detection mechanism 43 takes the current value of the rotary guide bushing shaft motor 1 through the data input / output circuit 11 and the shaft control section 10b 'to confirm that the cutting guide is rotated, and then rotates the guide bushing. Whether the current value of the shaft motor 13b increases. At this time, the cutting transfer instruction starts, and it reads and determines the cutting-related commands (straight line (G1), circular arc (G2, G3), spiral (G32), etc.) of the processing program from the processing program analysis processing unit 3. If the increase of the current value cannot be confirmed, it is judged that the actual cutting is not in progress and the processing is terminated. When the increase of the current value is confirmed, it is judged that the actual cutting is started and the process proceeds to step 2 3. In step 2 3, the current change detection unit 4 3 obtains the information such as the serial number and block number of the processing program 2 corresponding to the increase in current value (in the case of non-cutting) from the processing program analysis processing unit 3 ′, and compares it with the rotation guide. The current value before the sleeve motor 1 3b is increased is stored together. For example, a table shown in FIG. 9 is stored in the memory 7. The current value is from the spindle amplifier 1 2 b, and the actual current value / standard current value (%) is used as a feedback, so the actual current value / standard current value

313583.ptd Page 21 524725. 5. Description of the invention (17)-"%" is stored. After that, the current change amount detecting means 43 notifies the correction master-axis speed determining means 42 that the actual cutting is started. In step 24, the correction spindle speed determining mechanism 42 receives the notification of the current change detection mechanism 43 and reads and compares the non-cutting time of the rotary guide sleeve shaft motor 1 3b stored in the memory 7 in step 23. The current value (actual current value / standard current value U)), and the current value of the current rotating guide sleeve shaft motor 1 3b (actual current value / standard current value. The electric k value stored in the memory 7 and the current red transduction If the current values of the sleeve motor 1 3 b are not consistent, proceed to step 2 5; if the current values are consistent, proceed to step 2 6. Step 2 5 Lu, the correction spindle speed determination mechanism 42 will be transmitted to the rotating guide sleeve shaft The rotation speed command of the motor 13b is given after subtracting the preset value. The rotary guide sleeve motor 13b is issued. For example, if the speed of the rotary guide sleeve shaft motor is 5000 rpm and the preset value is 1 rpm, it will become 50000rpin-lrPm = 4999rpm, and 4999rpm is used as the speed command to control the rotary guide sleeve shaft motor 13b. At this time, the preset value is a parameter set by the parameter setting section 8 and depends on the judgment of the operator. Then return to step 24 to repeat the processing. In step 24, when the current value stored in the memory 7 is consistent with the current value of the rotating guide sleeve shaft motor 1 3b, for example, the rotation speed of the rotating guide sleeve shaft motor 1 3 b becomes 4 9 9 5 rpm, and the rotating guide The current value of the sleeve motor 1 3 b will be compared with the non-cutting phase meter h. That is, as shown in FIG. 8, cutting starts at time 11. Although the current value of the rotating guide sleeve motor 1 3 b increases from I 1 to I 2, but at time 11 3, when the correction spindle speed determining mechanism 42 starts correcting the rotation speed command transmitted to the rotary guide sleeve shaft motor 131 :), the current value of the rotary guide sleeve shaft motor 1 3 b starts to decrease. The current value I 1 during non-cutting is the same.

313583.ptd Page 22 524725 V. Description of the invention (18) In step 26, the rotation speed of the rotating guide sleeve shaft motor 13b determined by the correction spindle speed determination mechanism 42 is written in the ninth image stored in the corresponding step 23. Serial and box numbered items. During the period from the execution of the processing program to the last, this processing is repeated, and the rotation speed of the rotary guide bushing shaft motor 1 3b corresponding to one processing program is stored in the memory 7. The second and subsequent processing, that is, the processing of the second and subsequent workpieces, is shown in FIG. 9, and the data (speed) stored in the memory during the first processing is read by the correction spindle speed determination mechanism 42. And take the corresponding serial number and the speed of the block number as a command, and output it to the rotary guide sleeve shaft motor 1 3 b. When the corresponding serial number and block number are detected, the process is repeated. As shown in Figure 5, the current of the rotating guide bushing shaft motor 1 3 b is 11 during cutting (period 11 to 12) and non-cutting, so the heating of the rotating guide bushing shaft motor 1 3 b No change during cutting and non-cutting. In the second embodiment, the current value is fed back from the spindle amplifier 1 2 b with the actual current value / standard current value (%) as a feedback, so the current value is stored in the memory 7 as the actual current value / standard current value (%) . The current value stored in the memory 7 is compared with the current current value. Although the above description is compared as a percentage, the actual current value is stored in the memory 7 and can be compared with the current current value. In the second embodiment described above, although the current value during cutting is the same as the current speed command when the guide shaft motor is stored in the memory 7 during non-cutting, the speed command is used as the subsequent speed command, but it can also be used When cutting

313583.ptd Page 23 524725 V. Explanation of the invention (19) Current value and current of guide bushing shaft motor during non-cutting stored in memory 7 • Speed command when approximate value is used as the speed command in the future. According to the invention described above, the contact position between the workpiece and the rotating guide sleeve that guides the workpiece can often be controlled to be substantially at the same position only by the rotation speed command. It is not necessary to use expensive devices such as a spindle amplifier and a spindle motor, which are conventionally used for position control, but to use inexpensive devices such as an inverter device and an induction motor. That is, with a simple and inexpensive structure, the motor driving the guide bush will not generate a large torque during cutting, and no large current will flow through the motor driving the guide bush, so the machining accuracy of the machine It will not be affected by the heat of the motor of the driving sleeve, which can effectively improve the machining accuracy of the machine. According to other inventions of the present invention, in order to obtain a rotation speed instruction that makes the contact position of the workpiece and the rotary guide sleeve that guides the workpiece substantially always at the same position, the operator does not need to specifically measure the gap between the workpiece and the rotary guide sleeve. Therefore, the measurement error of the operator can be eliminated, and the reliability of the above-mentioned speed instruction setting can be effectively improved. Although a spindle amplifier and a spindle motor are used in the present invention, since only the revolution and speed commands are used for the control, a cheaper one can be used. Since no detector is needed to control the position, although it is not cheaper than the combination of an inverter device and an induction motor, it is cheaper than the conventional structure. [Possibility of industrial use] As described above, the method and device for synchronously controlling a main shaft of the present invention can be applied to the synchronous control of a main shaft and a guide bushing shaft such as an automatic lathe.

313583.ptd Page 24 524725 Brief description of the drawings [Brief description of the drawings] Fig. 1 is a block diagram of a main part of a numerical control device having a spindle synchronization control device in Embodiment 1 of the present invention. Fig. 2 is an explanatory diagram of a parameter setting day surface of a numerical control device provided with a spindle synchronization control device in Embodiment 1 of the present invention. Fig. 3 is a flowchart showing the work performed by the operator before processing according to the first embodiment of the present invention. Fig. 4 is a flowchart of calculating and controlling the rotation speed instruction of the guide sleeve shaft motor from the guide gap amount in the first embodiment of the present invention. Fig. 5 shows the current state after the rotation speed of the guide bush shaft induction motor or the spindle motor is updated in the first and second embodiments of the present invention. Fig. 6 is a block diagram of a main part of a numerical control device including a spindle synchronization control device in Embodiment 2 of the present invention. Fig. 7 is a flowchart for updating the rotation speed command of the guide shaft motor until the current value of the motor driving the guide sleeve becomes the current value before the actual cutting starts in the second embodiment of the present invention. Fig. 8 is a timing chart of the time variation of the current flowing to the guide sleeve shaft motor during actual cutting after calculating the appropriate rotation speed in the second embodiment of the present invention. Fig. 9 shows an example of storing the serial number, the block number, the current value of the guide bushing shaft motor during non-cutting, and the updated rotational speed data of the guide bushing shaft motor in the embodiment of the present invention. Fig. 10 is a block diagram of the main part of the coefficient value control device, which is a controller for synchronizing the spindle motor driving the spindle of the conventional automatic lathe and the spindle motor driving the guide bush.

313583.ptd Page 25 524725. Brief description of the drawings Figure 11 is a structural diagram of a machine tool automatic lathe. • Figure 12 is the detailed structure diagram of the main shaft and guide bush shown in Figure 11. Fig. 13 is a processing program showing the main part of controlling the rotation and stop of the spindle motor. Figure 14 is a timing chart showing the changes in the current of the conventional guide sleeve shaft motor during actual cutting. Figure 15 is a cross-sectional view of the relative relationship between the circular workpiece when it is inserted into the guide sleeve. [Description of component symbols] _ Machining program 3 Machining program analysis processing section 4 Interpolation processing section 5 Control circuit 6 Mechanical control signal processing section Ί Memory 8 Parameter setting section 9 Screen display section 10a Axis control section (spindle) 1 0 b axis Control Unit (Guide Bushing) 11 Data I / O Circuit 12a Spindle Amplifier (For Spindle) 12b Spindle Amplifier (For Guide Bushing) 13a Spindle Motor (For Spindle) .13b Spindle Motor (For Guide Bushing) 41 Spindle Speed Correction Calculation Mechanism 42 Correction of spindle speed determination mechanism 43 Current change detection mechanism 44 Speed data conversion mechanism # 01 Analog data output circuit 120a inverter device (for main shaft) 120b inverter device (for guide shaft) 130a induction motor (spindle For 130b induction motor (for guide bushing shaft)

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Claims (1)

524725 VI. Scope of patent application 1. A method for synchronous control of a spindle, which is controlled by: a spindle motor, which is used to drive a spindle that holds a workpiece; and a guide shaft motor, which is used to drive the rotation guide of the aforementioned workpiece. The sleeve is characterized in that: in order to make the contact position between the workpiece and the rotating guide sleeve that guides the workpiece actually ^, it is usually at the same position, and is calculated based on the amount of space generated between the workpiece and the rotating guide sleeve that guides the workpiece The rotation speed command of the aforementioned guide shaft motor is issued. 2. A synchronous control method of a main shaft, which controls: a main shaft motor which drives a main shaft for holding a workpiece; and a guide sleeve shaft motor which drives a rotary guide sleeve for guiding the aforementioned workpiece, which is characterized by: The contact position between the workpiece and the rotary guide sleeve that guides the workpiece is often in the same position. According to the amount of gap generated between the workpiece and the rotary guide sleeve that guides the workpiece, the rotation speed command of the spindle motor is corrected, and the The corrected speed command is used as the speed command of the guide sleeve shaft motor. 3. A synchronous control method for a main shaft, which controls: a main shaft motor that drives a main shaft for holding a workpiece; and a guide sleeve shaft motor that drives a rotary guide sleeve for guiding the foregoing workpiece, and causes the foregoing workpiece and the The contact point of the rotating guide sleeve that guides the workpiece is often at the same position. It is characterized by changing the rotation speed command to reduce the current value of the guide sleeve shaft motor during cutting, and changing the current value to a predetermined value. The rotation speed command at the current value is used as the rotation speed command of the aforementioned guide shaft motor. 4. A spindle synchronous control method, which is controlled by: spindle motor, which is 313583.ptd Page 28 524725 VI. Patent application scope Drives the main shaft to hold the workpiece; and guide sleeve shaft motor drives the rotary guide sleeve used to guide the workpiece, and enables the workpiece and the rotary guide to guide the workpiece The contact point of the sleeve is often in the same position, which is characterized in that the current value of the guide sleeve shaft motor during non-cutting is stored in advance, and the current value of the guide sleeve shaft motor and the previously stored current value are stored in advance. Actually, the same rotation speed command is used as the rotation speed command of the aforementioned guide shaft motor. 5. A spindle synchronous control device, which controls: a spindle motor which drives a spindle for holding a workpiece; and a guide sleeve axis motor which drives a rotating guide sleeve for guiding the aforementioned workpiece, which is characterized by: The spindle speed correction calculation mechanism is to make the contact position of the workpiece and the rotating guide sleeve that guides the workpiece always be at the same position, and calculate based on the amount of gap generated between the workpiece and the rotating guide sleeve that guides the workpiece. The rotation speed command of the aforementioned guide shaft motor. 6. A spindle synchronous control device, which controls: a spindle motor that drives a spindle for holding a workpiece; and a guide sleeve axis motor that drives a rotary guide sleeve for guiding the aforementioned workpiece, which is characterized by: There is a spindle speed correction calculation mechanism, which is to make the contact position of the workpiece and the rotary guide sleeve that guides the workpiece is often in the same position, and correct according to the amount of gap generated between the workpiece and the rotary guide sleeve that guides the workpiece. The speed command of the spindle motor is used as the speed command of the guide sleeve motor. 7. A spindle synchronous control device, which controls: a spindle motor, which drives a spindle for holding a workpiece; and a guide shaft motor, which drives 313583.ptd Page 29 524725 313583.ptd Page 30