JP2549664Y2 - Numerically controlled grinding machine - Google Patents

Description

[Detailed description of the invention] [Industrial applications]

The present invention relates to a numerically controlled grinding machine having a simple cycle for machining a simple shape of a workpiece.

[Prior art]

2. Description of the Related Art Conventionally, a numerically controlled grinding machine having a simple cycle for grinding a simple shape such as a flange outer peripheral surface of a workpiece has been known. In this simple cycle, when the cycle data and the table left and right advancing end are input and activated, a grinding cycle determined from the current wheel head position is executed.

[Problems to be solved by the invention]

However, the setting of the machining start position in the above-described simple cycle is left to the operator. Then, when started, the current grindstone head position becomes the processing start position and the operation is started, and the subsequent processing locus is determined. For this reason, for example, in the case of performing machining using selected simple cycle data among various kinds of stored simple cycle data or using previously used simple cycle data, if a simple cycle is started at an inappropriate machining start position, a grinding cycle is first performed. When the grindstone moves to the execution position, there is a possibility that the grindstone may be damaged due to interference with the outer shape of the workpiece. The present invention has been made to solve the above-mentioned problem, and the purpose thereof is to input a data for machining at the time of executing a simple cycle and to appropriately apply a workpiece to a workpiece at startup. An object of the present invention is to provide a numerically controlled grinding machine capable of confirming a tool position and preventing a tool damage or the like due to an inadvertent mistake of an operator or the like.

[Means for Solving the Problems]

In order to solve the above-mentioned problem, as shown in FIG. 6, the concept of the invention is to provide a driving means G6 for rotating a workpiece around a first axis and the workpiece and a tool by the first axis. Moving means G7 for relatively moving in the direction and a second axis direction intersecting the direction, current position detecting means G1 for detecting the current position of the workpiece and the tool by the mechanical system absolute position, and grinding the simple shape of the workpiece. A grinding cycle storage means G2 for storing a plurality of cycle data for processing, and a processing range specifying means G3 for specifying data representing a processing range of a workpiece required to execute a grinding cycle, In a numerically controlled grinding machine for grinding a simple shape of a workpiece based on the cycle data obtained and the data representing the processing range specified by the processing range specifying means G3, the cycle data stored by the grinding cycle storage means G2. On the basis of the data representing the specified machining area by data and the processing range specifying means G3 first
Start of the grinding cycle in the axial direction, which is the working range of the workpiece or a range obtained by adding the allowable value thereto, and which is determined by the sum of the finishing diameter of the workpiece and the starting distance of the blank in the second axial direction. Allowable range calculation means G4 that calculates the range in which the tool moves away from the workpiece from the position as the allowable range for starting machining of the tool
And start-up determination means G5 for determining whether the current position of the tool detected by the current position detection means G1 is within the processing start allowable range calculated by the allowable range calculation means G4. .

The workpiece is rotated around the first axis by the driving means G6,
The workpiece and the tool are relatively moved by the moving means G7 in the first axis direction and the second axis direction intersecting the first axis direction. The current position of the workpiece and the tool is detected by the current position detecting means G1 at the mechanical system absolute position. Grinding cycle storage means G2
Stores a plurality of cycle data for grinding a simple shape of a workpiece, and data indicating a processing range of the workpiece required to execute a grinding cycle is designated by a machining range designating means G3. You. Then, based on the cycle data stored by the grinding cycle storage means G2 by the permissible range calculation means G4 and the data representing the processing range specified by the processing range specifying means G3, the workpiece is moved in the first axis direction. The tool is more distant from the workpiece than the grinding range starting position determined by the sum of the finishing diameter of the workpiece and the starting distance of the blank in the second axial direction, which is a processing range or a range obtained by adding an allowable value thereto. The range is calculated as a machining start allowable range of the tool, and the activation possibility determining means G5 determines whether the current position of the tool detected by the current position detecting means G1 is within the machining start allowable range. With this, it is possible to confirm an appropriate tool position with respect to the workpiece at the time of startup only by inputting cycle data which is data for processing and a processing range of the workpiece,
It is possible to prevent the tool from interfering with the workpiece and other members (headstock, tailstock, etc.) at the time of startup.

【Example】

Hereinafter, the present invention will be described based on specific embodiments. FIG. 1 is a block diagram showing the entire mechanical configuration of a numerically controlled grinding machine having a simple cycle for processing a simple shape of a workpiece according to the present invention, and FIG. 2 is a diagram showing the numerical control device 30 of FIG. 3 is a block diagram showing an electrical configuration with an operation panel 20. Reference numeral 50 denotes a grinder, and a table 52 that slides on the bed 51 of the grinder 50 is provided on the bed 51 of the grinder 50. The table 52 is moved in the left-right direction (Z-axis direction) of the drawing by driving the table feed motor 53. A headstock 54 and a tailstock 56 are provided on the table 52. The headstock 54 has a spindle 55, and the tailstock 56 has a tailstock 57. The workpiece W is supported by the main shaft 55 and the tail shaft 57, and is rotated by the rotation of the main shaft 55. The rotation of the spindle 55 is performed by a spindle motor 59 provided on the headstock 54. On the other hand, a grinding wheel 60 for grinding the workpiece W is fixed to a drive shaft that is rotationally driven by a grinding wheel drive motor 62 provided on a grinding wheel stand 61. The wheel head 61 is a wheel head feed motor 63.
2 (see FIG. 2), the movement is controlled in the direction perpendicular to the paper surface of FIG. Also, the table feed motor 53 and the wheel head feed motor 6
3. A numerical controller 30 is provided to drive and control the spindle motor 59, the grinding wheel drive motor 62, and the like. Where Z
The axis corresponds to the first axis in claims, and the X axis corresponds to the second axis. In addition, the spindle motor 59 corresponds to a driving unit in the claims, and the table feeding motor 53 and the wheel head feeding motor 63 correspond to a moving unit. The drive units DUZ and DUX shown in FIG. 2 are circuits for inputting a position command from the numerical controller 30 to drive the table feed motor 53 and the grinding wheel feed motor 63, respectively. The table feed motor 53 and the wheel head feed motor
The absolute encoders A / E-1 and A / E-2 for realizing the current position detecting means and detecting the mechanical absolute position indicating the distance from the machine origin are connected to 63, and their outputs are combined. The signals are fed back to the drive units DUZ and DUX to perform position feedback control and are input to the numerical controller 30. The numerical control device 30 mainly includes, as shown in FIG.
It is composed of a CPU 31, a ROM 32 storing a control program, a RAM 33 storing input data and the like and achieving a grinding cycle storage means, and an input / output interface. N in RAM33
An NC data area 331 for storing a C program and a cycle data area 332 for storing grinding cycle data are formed. The operation panel 20 is attached to the numerical controller 30 via an input / output interface 34. On an operation panel 21 of the operation panel 20, a keyboard 22 for inputting data and a CRT display device 23 for displaying data are provided. Next, based on the flowchart of FIG. 3 showing the processing procedure of the CPU 31 used in the present embodiment, FIG. 4 specifically showing the display screen of the CRT display device at the time of a simple cycle setup work. It will be described with reference to FIG. First, the apparatus is set to the simple cycle mode, and in step 100, for example, a traverse (right) cycle is selected as a grinding cycle, and a keyboard 22 is selected.
When a key is input at, a data input screen as shown in FIG. 4 is displayed on the CRT display device. Next, the process proceeds to step 102 for achieving the processing range designating means, and the grinding wheel 60 as a tool is moved by manual operation, and the longitudinal reference is the longitudinal end position at which the grinding wheel 60 moves during the traverse processing on the workpiece W. The grinding wheel 60 is brought into contact with the two positions, namely, and the longitudinal assist, and the position storage button on the keyboard 22 is pressed, and the two positions are stored in the cycle data area 332. At this time, as shown in FIG.
Position data of the longitudinal reference and the longitudinal auxiliary, which are the positions of 81 and 82, are displayed. A range in the left-right (Z-axis) direction in which the grinding wheel 60 should be positioned to start machining by this operation is designated, and when the table 52 is in this range, a signal PSW indicating that machining is possible. (Programmableswitch)
Is output from the CPU 31. Next, proceeding to step 104, the operator inputs cycle data such as the number of traverses in the traverse (right) cycle and the traverse speed. Next, proceeding to step 106, if the data input is not completed, the above-described step 104 is repeated.
Move to In step 108, an allowable machining start range is calculated from the machining range of the workpiece W specified in step 102 and the cycle data input in step 104. At this time, in step 104, the PSW is output from the sum of the finishing diameter of the workpiece W input as the cycle data and the starting distance of the empty laboratory (distance from the finishing diameter to the position where the empty laboratory starts) in the X-axis direction. A range is specified. As shown in FIG. 5, the allowable range of the processing start is the whole area on the rear side of the starting distance for the grinding wheel in the grinding wheel 60, and the processing range ± parameter allowable value (predefined value) in the table 52. . Therefore, the range in which the PSW is output is the shaded portion in FIG. Next, the process proceeds to step 110 to move the grinding wheel 60 by manual operation. Next, the process proceeds to step 112 for achieving the activation possibility determination means, and it is determined whether or not the grindstone position is within the processing start allowable range. That is, it is determined whether or not the PSW is output, and even if it is started at the position of the grinding wheel 60 as it is, there is no interference with the workpiece W. If it is determined in step 112 that the grindstone position is not within the processing start allowable range and the starting cannot be performed, the process returns to step 110, and the processes in steps 110 to 112 are repeated. Then, the grinding wheel position is within the processing start allowable range, and the PSW
Is output and it becomes possible to start, the process proceeds to step 114, and C
"Start preparation completed" is displayed on the screen of the RT display device 23, and the program ends. Thereafter, by pressing the start button on the keyboard 22, a simple cycle is executed.

[Effect of the invention]

The present invention is based on the cycle data stored by the grinding cycle storage means and the data representing the processing range specified by the processing range specifying means. And the range in which the tool is farther from the workpiece than the grinding cycle starting position determined by the sum of the finishing diameter of the workpiece and the starting distance of the blank in the second axis direction. The tool is equipped with a permissible range calculation means for calculating as a range, so when executing a simple cycle, just input the grinding cycle and the processing range of the workpiece, which are the data for processing, and a suitable tool for the workpiece at startup. It is possible to confirm the position, and it is possible to prevent a tool damage or the like due to an inadvertent mistake of an operator or the like beforehand.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an overall mechanical configuration of a numerically controlled grinding machine having a simple cycle according to a specific embodiment of the present invention. FIG. 2 is a block diagram showing an electrical configuration of a numerical control device 30 and an operation panel 20 according to the embodiment.
FIG. 3 is a flowchart showing a processing procedure of a CPU 31 used in the apparatus of the embodiment. FIG. 4 is an explanatory view specifically showing a display screen of a CRT display device during a setup operation of a simple cycle in the apparatus of the embodiment. FIG. 5 is an explanatory diagram for explaining the operation of the present embodiment. FIG. 6 is a block diagram showing the concept of the present invention. 20 ... Operation panel, 21 ... Operation panel, 22 ... Keyboard,
23 CRT display device, 30 Numerical control device, 50 Grinding machine, 51 Bed, 52 Table, 53 Motor for table feed, 54 Headstock, 55 Spindle, 56 … Tailstock, 57… tailstock, 59… spindle motor, 60… grinding wheel,
61: Grinding wheel head, 62: Grinding wheel drive motor, 63: Grinding wheel feed motor, W: Workpiece, A / E-1, A / E-2 ... Absolute encoder, DUX, DUZ ... Drive unit

Claims (1)

(57) [Scope of request for utility model registration] 1. A driving means for rotating a workpiece around a first axis, a moving means for relatively moving the workpiece and the tool in the first axis direction and a second axis direction intersecting the first axis direction,
Current position detection means for detecting the current position of the workpiece and the tool in a mechanical system absolute position, grinding cycle storage means for storing a plurality of cycle data for grinding a simple shape of the workpiece, A machining range designating means for designating data representing a machining range of the workpiece necessary to execute the grinding cycle, wherein the cycle data selected and the machining range designated by the machining range designating means are provided. In a numerically controlled grinder for grinding a simple shape of a workpiece based on data representing the cycle data stored in the grinding cycle storage means and data representing the processing range specified by the processing range specifying means, A processing range of the workpiece with respect to the first axis direction or a range obtained by adding a tolerance to the processing range based on the first axis direction, and the processing range with respect to the second axis direction. Tolerance range calculating means for calculating a range in which the tool moves away from the workpiece from a grinding cycle start position determined by a sum of a finish diameter of the workpiece and a blanking start distance as a machining start tolerance of the tool; Start-up determining means for determining whether the current position of the tool detected by the current position detecting means is within the machining start allowable range calculated by the range calculating means. .