JP4430008B2 - Saw blade rotation phase control processing equipment - Google Patents

Description

The present invention relates to a saw blade rotation phase control processing device that performs cutting processing or the like on a workpiece by a rotating saw blade.

  2. Description of the Related Art Conventionally, a cutting apparatus that cuts a long workpiece or the like is generally cut by rotating a saw blade such as a circular saw. Since this saw blade is formed in a thin metal disk shape, it is not formed in a perfect plane, has a slight warp and other distortion, and has also been shaken by rotating at high speed.

On the other hand, in a lathe device or the like, as a method for improving the accuracy of cutting, Patent Document 1 discloses a lathe processing device that reduces bending and vibration generated when cutting a workpiece when cutting the workpiece. . In addition, Patent Document 2 discloses a lathe apparatus that has an apparatus that detects the phase of the spindle motor and adjusts the phase of the drive device when performing machining such as turning, and improves the operation efficiency. .
JP-A-5-245701 Japanese Patent Laid-Open No. 10-113801

  In the above conventional technique, when cutting a workpiece, the saw blade is pivotally supported by a circular center portion and is rotated, and the workpiece is cut into the workpiece with slight vibration. When cutting into the workpiece in this state, the cutting path is bent, and there is a problem that a slight positional deviation occurs between the positions at the time of cutting and at the time of completion of cutting, resulting in a decrease in machining accuracy. In recent years, the machining accuracy of a workpiece is often required to be very high-precision machining, for example, about several μm, and high-precision machining has been demanded even when the workpiece is cut with a saw blade.

  Here, considering the cutting accuracy of the workpiece 50 by the saw blade 52, the saw blade 52 generally used for cutting the workpiece 50 has a plane center of the shaft-supported saw blade 52 as a rotation shaft 54 as shown in FIG. The whole is slightly distorted and a complete plane is not formed. Therefore, in order to detect the deflection of the saw blade 52, a displacement detector 56 is attached to the processing device to which the saw blade 52 is attached in the vicinity of the surface of the saw blade 52, and the workpiece 50 is cut along the cutting line 58. The deflection of the saw blade 52 was detected by a displacement detector 56 and recorded. The results are shown in the graph of FIG.

  The Y-axis direction of the graph shown in FIG. 5 is a direction perpendicular to the cutting direction of the workpiece 50 and represents the deflection direction of the saw blade 52, and the X-axis direction is time. Here, three samples having different cutting positions with respect to the workpiece 50 are displayed side by side. From this graph, it can be seen that when the saw blade 52 is cut into the workpiece 50, the swing width c of the saw blade 52 decreases, and when the machining is completed, the swing width increases again. Between a and b shown in the graph of FIG. 5 is a period from the start to the end of cutting the workpiece 50.

  Further, it can be seen that there is a deviation in the cutting position at the start and completion of the cutting into the workpiece 50, and it varies depending on the cutting position of the saw blade 52 that starts cutting into the workpiece 50. For example, No. shown in the graph. In the locus of 3, when the saw blade 52 starts to cut into the workpiece 50, the swing of the saw blade 52 becomes small, and the cutting position is slightly shifted from the beginning of cutting at the cutting completion position. On the other hand, no. In No. 2, no. When the cutting position of the third saw blade 52 is 0 °, the cutting position to the workpiece 50 is cut from the position where the phase of the saw blade 52 is shifted by about 90 ° on the circumference of the saw blade. . In this case, at the same time as the deflection width of the saw blade 52 changes, the position at the time of completion of cutting is slightly more biased than the cutting start position compared to No3. Furthermore, no. In No. 1, the cutting position to the workpiece 50 is No. 3 is cut from a position where the phase of the deflection waveform is shifted by about 180 ° on the circumference of the saw blade. More than 2 and there is a difference between the cutting start position and the cutting completion position.

  From this, it can be seen that the cutting position into the workpiece 50 affects the subsequent cutting accuracy due to the slight distortion of the saw blade 52 as shown in FIG. However, since the saw blade 52 is formed from a thin metal plate, there is a limit to completely suppressing the surface runout without any distortion.

The present invention has been made in view of the above-mentioned problems of the prior art, and can start cutting into a workpiece from a position where the distortion of a saw blade to be used is small, can be cut with high accuracy, and can perform multiple cutting. It is an object of the present invention to provide a saw blade rotation phase control processing device with little variation in processing accuracy even when processed.

The present invention includes a vise formed so as to be capable of gripping a workpiece, a saw blade for cutting the workpiece, a spindle motor that rotationally drives the saw blade, and a saw blade holding portion on which the saw blade is rotatably mounted. A displacement detection device that is mounted near the surface of the saw blade and detects the deflection of the saw blade, a feed motor that feeds the saw blade holding part or workpiece in the machining direction, and a saw that detects the position of the saw blade holding part. A blade position detection device, a saw blade phase detection device that detects the phase of the saw blade, an input signal from each of the saw blade phase detection device, the saw blade position detection device, and the displacement detection device to process the saw A motor control device that controls the machining start position of the blade with respect to the workpiece, a spindle motor drive device that drives the spindle motor by a control signal output from the motor control device, and an output from the motor control device A saw blade rotational phase control processing apparatus and a feed motor drive device for controlling the feed motor by control signals.

The motor control device can control the phase of the cutting of the saw blade into the workpiece by controlling the feed motor based on signals from the saw blade phase detection device, the saw blade position detection device, and the displacement detection device. The spindle motor driving device and the feed motor driving device are controlled so that the saw blade starts to cut into the workpiece at the phase of the saw blade with the minimum runout of the saw blade .

According to the saw blade rotation phase control processing apparatus of the present invention, it is possible to detect the saw blade phase with a small warp and distortion of the saw blade to be used, and to cut into the workpiece from the position of the optimum cutting phase of the saw blade , There is little variation in the processing accuracy of the cut surface, and cutting can be performed with high accuracy.

Hereinafter, an embodiment of a saw blade rotation phase control processing apparatus according to the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the machining apparatus 10 of this embodiment is provided with a feed motor 14 that feeds a saw blade 30 as a tool in the cutting direction, and a shaft 14 a of the feed motor 14 is connected via a connecting portion 16. The feed shaft 18 is connected. The feed shaft 18 is provided with, for example, a ball screw and screwed into a screw portion 21 provided in the saw blade holding portion 20, and the saw blade holding portion 20 is formed to be movable by the rotation of the feed shaft 18. Yes.

  The saw blade holding portion 20 is provided with a main shaft motor 22 and a transmission 24, and the transmission 24 is connected to the shaft of the main shaft motor 22 inside the saw blade holding portion 20. A main shaft 26 is connected to the transmission 24 and protrudes from a side surface of the saw blade holding portion 20 to form a saw blade mounting portion 28. A disc-shaped saw blade 30 is fixed to the saw blade mounting portion 28.

  A displacement detection device 32 such as a displacement sensor is provided near the end of the saw blade 30 so as to face the surface 30 a of the saw blade 30. The displacement detection device 32 is configured to detect a distance from the saw blade 30 and to input a signal indicating a swing width of the saw blade 30 to a motor control device 38 to be described later. Further, as shown in FIGS. 1 and 2, a vise 34 that grips the workpiece 12 at a right angle to the longitudinal direction of the long workpiece 12 is provided at a position opposite to the saw blade 30 in the feeding direction.

  As shown in FIG. 3, the machining apparatus 10 of this embodiment is provided with a saw blade position detection encoder 36 that is a saw blade position detection device that detects the position of the saw blade 30 of the saw blade holding unit 20. The saw blade position detection encoder 36 detects the feed amount by the feed motor 14, and processes and outputs the position detection signal so that it can be input to the motor control device 38 or the feed motor drive device 48. Further, a spindle motor rotation detection device 40 that detects the rotation of the spindle motor is attached to the spindle motor 22. The spindle motor rotation detection device 40 controls the rotation of the spindle motor 22 and processes and outputs the detection signal so that it can be input to the motor control device 38 or the spindle motor drive device 46.

  Also, a saw blade phase detection rotary encoder 42 that is a saw blade phase detection device for detecting the rotational phase of the saw blade 30 is provided in the vicinity of the saw blade mounting portion 28 provided on the main shaft 26 of the saw blade holding portion 20. Yes. The saw blade phase detection rotary encoder 42 processes the phase detection signal so that it can be input to the motor control device 38 and outputs it.

  The motor control device 38 performs arithmetic processing based on the input signal and outputs an operation control signal for the spindle motor 22 to the spindle motor driving device 46. At the same time, an operation control signal to the feed motor 14 is output to the feed motor driving device 48. The spindle motor drive device 46 and the feed motor drive device 48 are formed so that the spindle motor 22 and the feed motor 14 can be operated in accordance with an operation control signal from the motor control device 38.

  Next, the usage method of this processing apparatus is demonstrated. Before machining the workpiece 12 to be cut by the machining apparatus 10, the runout characteristics of the attached saw blade 30 are registered in advance. First, the saw blade 30 is attached to the saw blade attachment portion 28, the saw blade 30 is idled, and the runout characteristics of the saw blade 30 are registered. Then, the deflection characteristic of the saw blade 30 detected by the idle rotation of the saw blade 30 is detected as a deflection width by the displacement detection device 32 and registered in the storage unit of the motor control device 38.

  Subsequently, the original work 12 to be cut is gripped by the vise 34 and the cutting process is started. At this time, the motor control device 38 sends the spindle motor drive device 46 and the feed motor drive device 48 to the spindle motor drive device 46 and the feed motor drive device 48 based on detection signals from the saw blade position detection encoder 36, the spindle motor rotation detection device 40, and the saw blade phase detection rotary encoder 42. An operation control signal is output. Then, the spindle motor 22 and the feed motor 24 are synchronously controlled, and cutting into the workpiece is started from a phase where the saw blade 30 has little deflection, and cutting is performed.

  According to the processing apparatus 10 of this embodiment, since it is possible to cut into the workpiece 12 from a position where the runout is small in accordance with the runout characteristics of the sawblade 30 to be used, even the sawblade 30 formed of a thin metal plate can be cut. Cutting is possible with high accuracy from start to completion. In addition, the distortion amount and position of the saw blade 30 change as the cutting process continues, but the runout of the saw blade 30 is measured and registered and processed by periodically or every time the workpiece is changed. It is possible to cut into the workpiece 12 from the phase position where the saw blade 30 is less shaken at every measurement, and even when a large number of workpieces 12 are cut, there is little change in error between the cutting start position and the cutting completion position, and the machining accuracy of the cut surface is improved. The variation can be small. In addition, there is no time loss by performing the runout measurement while the workpiece 12 is being loaded.

The saw blade rotation phase control processing device of the present invention is not limited to the above embodiment, and when the saw blade moves relative to the workpiece and the workpiece moves relative to the saw blade for machining. It is also applicable to. Moreover, since the workpiece | work hold | gripped by the vise should just be cut | disconnected by the rotating saw blade, the magnitude | size of a saw blade, the shape of a vise, etc. can be suitably set according to a workpiece | work raw material. Further, in addition to the displacement sensor, the distance detection device can use a sensor such as a laser displacement meter and other position detection devices, and the shape and material of each member can be appropriately changed.

It is a schematic side view which shows the side surface of the processing apparatus of one Embodiment of this invention. It is a schematic top view of the processing apparatus of this embodiment. It is a schematic block diagram which shows the structure of the control part of the processing apparatus of this embodiment. It is a schematic diagram which shows the runout state of the rotary saw blade which cut | disconnects a workpiece | work. It is a graph which shows the runout state of the rotary saw blade from the cutting start of a workpiece | work to completion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Processing apparatus 12 Workpiece 14 Feed motor 16 Connecting part 18 Feed shaft 20 Saw blade holding part 22 Main shaft motor 30 Saw blade 32 Displacement detection device 34 Vise 36 Saw blade position detection encoder 38 Motor control device 40 Spindle motor rotation detection device 42 Saw blade Phase detection rotary encoder 46 Spindle motor drive device 48 Feed motor drive device

Claims (1)

A vise formed so as to be capable of gripping a workpiece, a saw blade for cutting the workpiece, a spindle motor that rotationally drives the saw blade, a saw blade holding portion on which the saw blade is rotatably mounted, and the saw blade Displacement detection device that is mounted near the surface of the blade and detects the deflection of the saw blade, a feed motor that feeds the saw blade holder or workpiece in the machining direction, and a saw blade position detector that detects the position of the saw blade holder A saw blade phase detection device for detecting the phase of the saw blade, and the input signal from each of the saw blade phase detection device, the saw blade position detection device, and the displacement detection device to process the workpiece of the saw blade. A motor control device that controls the machining start position for the motor, a spindle motor drive device that drives the spindle motor by a control signal output from the motor control device, and a control signal output from the motor control device. In saw blade rotational phase control processing apparatus and a feed motor drive device for controlling the feed motor,
The motor control device controls the phase of the cutting of the saw blade into the workpiece by controlling the feed motor according to signals from the saw blade phase detection device, the saw blade position detection device, and the displacement detection device. A saw blade that controls the spindle motor driving device and the feed motor driving device so that the saw blade starts to cut into the workpiece at a phase of the saw blade that is provided so as to have a minimum runout of the saw blade. Rotary phase control processing device.

Images