KR20090029041A - Control method of computer numerical control apparatus - Google Patents

Abstract

A control method of a CNC(Computerized Numerical Control) machine is provided to process a work piece in a conical shape with a tool rotating around the work piece placed on the central axis. A control method of a CNC machine comprises a step of receiving process conditions including the inclination and the travel direction of a tool and the processing depth of a work piece, a step of moving the tool to the processing depth of the work piece from the start point, a step of tilting the tool by the inclination and rotating the inclined tool with maintaining the inclination by adjusting the angle of a link according to the rotation angle, and a step of processing the work piece with the tool based on the processing conditions until the end point.

Description

CONTROL METHOD OF COMPUTER NUMERICAL CONTROL APPARATUS}

The present invention relates to a method for controlling a computer numerically controlled machine tool, and more particularly, in a computer numerically controlled machine tool, a tool is processed while rotating a circular arc around a workpiece placed on a central axis while maintaining a constant angle with the central axis. The present invention relates to a method for controlling a computer numerical control machine tool.

In general, a computer numerical control (CNC) machine tool refers to a machine for processing a workpiece by inputting numerical data for processing control into a processor and driving a tool according to the control.

Computer numerically controlled machine tools are typically arranged to rotate a workpiece at a given speed in a roll grinding machine for grinding the workpiece into a roll shape, and to move the tool in the radial direction or in the axial direction of the workpiece while grinding the workpiece in the roll shape. It is.

At this time, since the tool must be moved, the computer numerical control machine tool has a memory device for storing numerical control data, and the radial movement amount of the tool dependent on the tool axis position is numerically programmed by the numerical control data. The control device for supplying the command pulse to the drive device for movement is based on the numerical control data.

The rolls processed by computer numerically controlled machine tools include rolls of different shapes, from simply cylindrical rolls to rolls with pointed, sinusoidal and sharp outer peripheral shapes for various applications.

On the other hand, in the large-scale cutting device, it is common that the computer program controls the progress control of the cutting program including the movement control of each bogie corresponding to the shape of the figure to be cut and the progress of the cutting process.

When a product cut from the material to be cut is welded with another product, an improvement may be made in the outer circumference of the product.

In the case of improvement cutting, it is necessary to incline the torch rod corresponding to the desired improvement angle and to control the inclination direction of the torch rod to always be directed to the normal direction with respect to the direction of cutting.

Therefore, in mold cutting, it is necessary to turn the torch rod inclined according to the change of cutting progress direction.

For this reason, the mold cutting device includes a torch block configured to set the torch rod at a predetermined angle, a torch turning device for turning the torch block, a torch rotating device for rotating the torch according to the turning of the torch block, and the like. It has an improved cutting device, and as the cutting proceeds, by controlling the torch turning device corresponding to the traveling direction of the torch rod, it is configured to form an improvement having a predetermined angle on the side of the product.

In the improved cutting device, when the torch rod is perpendicular to the surface of the material to be cut, the axis of the torch rod is on an extension line of the torch turning device pivot axis.

Further, the center of rotation when the torch rod is inclined is set on the extension line of the torch rod shaft core, and when the torch rod is inclined, the intersection point between the extension line of the torch rod shaft core and the pivot axis extension line is the surface or thickness of the cutting material. It is adjusted to be at a predetermined position in the direction.

However, in the related art, the structure of the torch turning device becomes complicated in response to the number of fluids such as gas or cooling water to be supplied to the torch rod and the number of cables to be connected.

Therefore, the present applicant can rotate the torch rod in the left and right direction through a simple link structure and connect the frame connected with the torch rod to the arc-shaped guider to rotate the frame and the torch rod in the front and rear directions. Patent Application No. 10-2007-0025717 (2007.03.15.) Has been filed "an angle adjusting device of the torch rod" that allows the rod to rotate freely in a complex four directions.

As such, in a machine tool employing an angle adjuster that can rotate the tool freely by turning the tool including the torch rod in a complex four directions, the tool is positioned around the workpiece in the central axis while maintaining a constant angle with the central axis. In order to be able to process the workpiece while rotating along the arc, the numerical control data by computer numerical control should be input and processed on the basis.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to rotate a circular arc around a workpiece placed on a central axis while the tool maintains a constant angle with the central axis in a computer numerically controlled machine tool. The present invention provides a method of controlling a computer numerical control machine tool for machining a workpiece.

The present invention for achieving the above object relates to a control method of a computer numerical control machine tool having an angle adjusting device capable of freely turning the tool by rotating the tool in a complex four directions through a link structure, Receiving the machining conditions including the machining depth of the workpiece and the tool tilt and the direction of movement relative to the central axis of the workpiece, and moving the tool from the machining starting point to the machining depth after receiving the machining conditions. And, after moving the tool to the machining depth, tilting the tool with the tool tilt and rotating the tool in the direction of movement while maintaining the tool tilt by adjusting the angle of the link according to the rotated angle of rotation. Machining the workpiece while rotating to the end point according to the machining conditions Characterized in that made.

In the present invention, the step of constantly maintaining the tool tilt is characterized in that the tool tilt is constantly maintained by adjusting the angle of the link by the X-axis tilt A and the Y-axis tilt B by the following equation in the XY plane. .

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K: Tool tilt θ: Rotation angle

As described above, the present invention is a computer numerically controlled machine tool that can process a workpiece while rotating a circular arc around a workpiece placed on the central axis while maintaining a constant angle with the central axis. Through the effect of machining the workpiece into a cone shape.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings, and the same parts as in the prior art use the same reference numerals and names. In addition, the present embodiment is not intended to limit the scope of the present invention, but is presented by way of example only and those skilled in the art will be capable of many modifications within the technical spirit of the present invention.

1 to 2 is a perspective view and a rear view according to an embodiment of the angle adjusting device applied to a computer numerical control machine tool according to the present invention described here as a configuration to adjust the angle of the governing rod by connecting the torch rod as a tool do.

However, when the torch holder 20 is replaced with a tool holder for cutting or polishing, the workpiece may be processed while adjusting the angle of the tool.

As shown in Figure 1 and 2, as shown here, the angle adjusting device of the torch rod is a frame (110a), the link unit 100, the transmission member (170a) and the bracket connected to the frame (110a) 210, a plate 220, and a rotation member 230.

In particular, the frame 110a includes a reciprocating motor 112a.

Here, the reciprocating motor 112a may be inserted into the frame 110a and fixedly installed therein, but is integrally coupled to the rib 113 extending above one end of the frame 110a.

In addition, the link unit 100 is composed of an electric link 120, a main link 130, a driven link 140, a connection link 150 and an auxiliary link 160.

Here, the electric link 120 is formed in an isosceles triangular shape, is rotatably installed on the basis of the end portion where the isosceles meet.

That is, the electric link 120 is installed to reciprocate in a predetermined rotation angle range by connecting the end portion with the reciprocating motor 112a.

The main link 130 pivotally links the upper end to one end of the electric link 120 facing the reciprocating motor 112a, and connects the lower end to the torch holder 20 to be rotatably linked.

Therefore, the electric link 120 and the torch holder 20 are rotated by the same rotation angle in the same direction.

At this time, the torch holder 20 is inclined to the torch rod 10 by the rotation angle as the torch rod 10 is fixedly inserted.

In addition, the driven link 140 is formed to be bent in the direction of the reciprocating motor 112a at the upper end of the main link 130.

Accordingly, the driven link 140 is moved along the circular arc trajectory which is rotated at the same time as the rotation angle in the same direction as the torch holder 20 in one end and the main link 130.

Here, the main link 130 and the driven link 140 is integrally connected, the shape is preferably 'b'.

On the other hand, the connecting link 150 links the upper end to the end of the driven link 140, the lower link to the frame (110a).

At this time, the lower end of the connection link 150 is located in line with the central axis of the transmission link 120 in the longitudinal direction of the frame (110a).

The interval between the lower rotational center of the electric link 120 and the lower rotational center of the connection link 150 is equal to the length of the driven link 140, and the length of the electric link 120 is the main dynamic link 130. ) And the auxiliary link 160 should be a distance that the main link 130 and the auxiliary link 160 is not interfered with.

In addition, the length of the electric link 120 should be the same as the length of the connection block 182.

Therefore, since one side edges of the connection link 150 and the electric link 120 are arranged side by side, when the electric link 120 is rotated, the connection link 150 and the electric link 120 are rotated by the same rotation angle. do.

At this time, the main link 130 is always maintained perpendicular to the axial direction of the frame (110a).

In addition, the auxiliary link 160 is linked to the other end of the end of the electric link 120, and the lower link to the torch holder 20.

Here, the other end of the end of the electric link 120 is a position corresponding to the one end edge connected to the main link 130 and the link at the end of the electric link 120.

In particular, the auxiliary link 160 is always installed to be parallel to the main link 130.

Thus, the upper end of the auxiliary link 160 is rotated in the same direction and the same angle as the other edge end of the electric link 120, the lower end of the auxiliary link 160 is the same direction and the lower end of the electric link 120 It is rotated at the same angle.

On the other hand, the electric link 120 is received by the driving force of the reciprocating motor 112a by the electric member 170a is reciprocated within a certain rotation angle range.

The transmission member 170a includes a transmission shaft 172, a main shaft 174, and a belt member 176.

The transmission shaft 172 is connected to the reciprocating motor 112a fixedly installed on the rib 113 and rotated when the reciprocating motor 112a is driven.

At this time, the reciprocating motor (112a) is a stepping motor, by the reciprocating motor (112a) the electric shaft 172 is repeated in one direction rotation and the other direction rotation at a uniform time interval.

On the other hand, the driven shaft 116 is provided in the frame (110a).

Accordingly, the belt member 176 is simultaneously wound to the transmission shaft 172, the main shaft 174 and the driven shaft 116 to form a triangular shape.

That is, as the belt member 176 has a triangular shape to improve the tension.

In addition, the tension wheel 114 is rotatably provided on the frame 110a so as to press the belt member 176.

Thus, the belt member 176 is formed in a triangular shape is pressed to the tension wheel 114 while being rotated to maximize the tension.

In this way, by rotating the tool in a complex four directions through the link structure, by applying an angle adjusting device that can freely change the tool to the machine tool to process the workpiece through numerical control.

In the present invention through the computer numerical control as shown in Figure 3 to start the cone-shaped machining, starting from the point P1 to the depth of the processing point P2, the center axis and the constant tool tilt (K) 40 is placed (K) If the tool 30 rotates from the point P2 to the point P7 so that the tool 30 rotates to form a cone, the tool tilt (K) formed with the central axis remains constant, but the tool tilt (K) remains constant. In order to maintain the tool 30 must be processed while correcting the angle of the angle adjuster according to the rotation angle to the X-axis and Y-axis.

Therefore, the control method of the computer numerical control machine tool for conical machining is first, as shown in Figure 4, the tool depth of the workpiece 40 and the tool 30 is inclined with respect to the central axis of the workpiece 40 The processing conditions including the slope K and the moving direction are received (S10).

In this way, the tool 30 is moved from the point P1, which is the starting point of machining, to the point P2 according to the depth of machining according to the input machining conditions (S20).

After moving to the point P2, the work piece 40 is processed while tilting the tool 30 so as to face the work piece 40 according to the input tool tilt K, and moving to the point P3, which is a counterclockwise direction of movement.

At this time, when the tool 30 rotates along the arc from the point P2 to the point P3, the tool 30 is maintained at the X and Y axes so that the tool tilt K is kept constant by adjusting the angle of the link according to the rotation angle θ. It must be corrected by tilting the axis (S30).

That is, as shown in FIG. 5, when the tool 30 makes the tool tilt with the workpiece 40 as K, the triangle is formed by the value of θ, which is an angle of rotation, which is an equiangular angle of the plane circumference moved from the point P2 to the point P3. Using the function, the angle of the link is adjusted by the X-axis inclination A and the Y-axis inclination B so that the tool tilt K is kept constant.

At this time, the X-axis inclination A is calculated by Equation 1, and the Y-axis inclination B is calculated by Equation 2.

Accordingly, the tool tilt K is kept constant by correcting the X-axis inclination A and the Y-axis inclination B by the rotation angle θ that changes as the tool 30 rotates along the arc.

In this way, while maintaining the tool tilt (K) by processing the workpiece 40 while rotating to the end point in accordance with the processing conditions to perform a cone-shaped processing (S40).

1 is a perspective view according to an embodiment of an angle adjusting device applied to a computer numerical control machine tool according to the present invention.

Figure 2 is a rear perspective view according to an embodiment of the angle adjustment device applied to a computer numerical control machine tool according to the present invention.

3 is a view showing a process of changing the tool tilt as the tool rotates for the cone machining in the present invention.

4 is a flowchart illustrating a control method of a computer numerical control machine tool according to the present invention.

5 is a view for explaining a method for calculating a correction value in order to maintain the tool tilt while the tool rotates along the arc in the present invention.

   -Explanation of symbols for the main parts of the drawings-

10: torch rod 20: torch holder

30: tool 40: workpiece

110a: frame 112a: reciprocating motor

120: electric link 130: main link

140: driven link 150: link

160: auxiliary link 170a: transmission member

172: electric shaft 174: main shaft

176: belt member 180: connecting member

210: bracket 212: motor for rotation

220: plate 230: rotating member

232: electric gear member 234: fixed gear member

240: rocking prevention member

Claims (2)

A control method for a computer numerical control machine tool having an angle adjusting device capable of freely turning a tool by rotating a tool in a complex four directions through a link structure, Receiving a processing condition including a machining depth of the workpiece and a tool tilt and a direction of movement of the tool inclined with respect to a central axis of the workpiece; Moving the tool from the machining starting point to the machining depth of the workpiece after receiving the machining conditions; Moving the tool to the processing depth and then tilting the tool with the tool tilt and rotating the tool in a moving direction to maintain the tool tilt by adjusting the angle of the link according to the rotation angle rotated; Machining the workpiece while rotating the tool tilt while maintaining the tool slope constant according to the machining conditions. Computer numerical control machine tool control method, characterized in that consisting of. The method of claim 1, wherein the maintaining of the tool tilt is performed by adjusting the angle of the link by the X-axis tilt A and the Y-axis tilt B by the following expression in the XY plane to maintain the tool tilt constant. Computer numerical control machine tool control method, characterized in that.

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K: Tool tilt θ: Rotation angle

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