JP2941031B2 - Numerical control unit for grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

 The present invention relates to a numerical controller for a grinding machine.

[Prior art]

Conventionally, in the grinding of a stepped workpiece having a cylindrical portion and an end surface portion, when grinding only the cylindrical portion, when grinding only the end surface portion, when grinding both the cylindrical portion and the end surface portion, the cylindrical portion and There are many grinding patterns, such as when grinding the end face and the joint between the cylindrical part and the end face. For this reason, in the conventional grinding machine, the cylindrical part, the end face part, and the joint part are separately defined in shape, and the presence or absence of grinding, the type of grinding cycle, and the like are input for each part. That is, in the setup work that defines the external shape of the workpiece,
As shown in FIG. 9, the shape continuous with the end face portion, the connecting portion, and the cylindrical portion is divided into three basic shape patterns, which are defined by being stacked in order. Then, the presence or absence of grinding, the type of grinding cycle, dimensional data, and the like are input for each part, and the grinding of the workpiece is controlled based on the data.

[Problems to be solved by the invention]

In the above-mentioned method, since the three shapes of the end face, the connecting portion, and the cylindrical portion must be separately defined, the number of key inputs is increased and a considerable setup time is required. In addition, it is necessary to select a grinding cycle for each part, and the processing definition is troublesome. Furthermore, for example, in order to define a connecting portion starting from the middle of the end face portion such as an R connecting which is a corner R, it is not possible to directly input an R (= radius) dimension which is a drawing dimension. That is, the connecting portion has a radius R in contact with the end surface portion and the cylindrical portion.
It was necessary to calculate the coordinate positions of those contacts not shown on the drawing, and data input was cumbersome. The present invention has been made to solve the above-described problem, and an object thereof is to facilitate a procedure for selecting a basic shape pattern in the definition of the outer shape of a workpiece, and to provide a cylindrical portion. An object of the present invention is to provide a numerical controller for a grinding machine in which an optimum grinding cycle is automatically selected according to whether or not an end face portion is ground.

[Means for Solving the Problems]

The configuration of the invention for solving the above-described problem is a numerical control device for a grinding machine that controls the grinding of a workpiece based on a designated basic shape pattern and input dimensional data, Basic shape pattern storage means for storing, as a basic shape pattern, a plurality of continuous shapes formed by combining an end face portion and a cylindrical portion, and a connecting portion such as a corner R and a sewn portion between the end face portion and the cylindrical portion; A basic shape pattern selecting means for selecting a basic shape pattern corresponding to the outer shape of the workpiece from a plurality of basic shape patterns stored in the shape pattern storage means by designating an operator; and a basic shape pattern selecting means. Screen display means for displaying an input screen for inputting the dimensions and the allowance of the basic shape pattern selected by the user, and an input screen display On the input screen of the basic shape putter displayed in the column, the non-ground surface stores data input means that can be input with a code indicating that the machining allowance is zero, and a plurality of grinding cycles such as cylindrical grinding, cylindrical grinding with end face, etc. Grinding cycle storage means, the necessity of the grinding of the end face part and the cylindrical part and the joint part is determined by whether or not the sign of the machining allowance data input by the input means is zero,
Grinding cycle determining means for determining one of a plurality of grinding cycles stored in the grinding cycle storing means in accordance with the result of the determination, the grinding cycle determined by the grinding cycle determining means, and the dimensions and the allowance input by the input means. And control means for controlling the grinding of the workpiece in accordance with Further, another invention determines whether or not the end face portion, the cylindrical portion, and the joint portion need to be ground by determining whether or not the machining allowance data input by the input means is a code indicating zero. It is characterized by further comprising an identification display means for identifiably displaying a ground surface and a non-ground surface on the basic shape pattern selected by the pattern selection means.

[Action]

In the basic shape pattern storage means, a plurality of continuous shapes formed by combining the end face portion of the workpiece, the cylindrical portion, and the connecting portion such as a corner R and a sunk portion between the end face portion and the cylindrical portion are stored as the basic shape pattern. ing. Then, the basic shape pattern is selected by the basic shape pattern selecting means in accordance with the operator's specification according to the shape of the workpiece.
Further, the input screen display means displays an input screen for inputting dimensions and allowance of the basic shape pattern selected by the basic shape pattern selecting means. Next, the non-ground surface is input with a code indicating that the allowance is zero on the displayed basic shape pattern input screen by the data input means. At the time of grinding, the necessity of grinding of the end face portion, the cylindrical portion and the joint portion is determined based on whether or not the data of the allowance input by the input means is a code indicating zero. Next, one of the plurality of grinding cycles stored in the grinding cycle storage means is determined according to the determination result. Then, the control means controls the grinding of the workpiece in accordance with the determined grinding cycle, the dimensions and the amount of input inputted by the input means. Further, in the second invention, the necessity of the grinding of the end face portion, the cylindrical portion, and the joint portion is determined based on whether or not the margin data input by the input means is a code indicating that it is zero, The ground surface and the non-ground surface on the basic shape pattern selected by the basic shape pattern selecting means are displayed in a distinguishable manner.

【Example】

Hereinafter, the present invention will be described based on specific examples. FIG. 1 is a configuration diagram showing an overall mechanical configuration of a grinding machine having a numerical control device according to the present invention. Reference numeral 50 denotes a grinder, and a table 52 which folds with respect to the bed 51 is provided on a bed 51 of the grinder 50. The table 52 is moved in the horizontal direction in 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 supported on a grinding wheel table 61 and is driven to rotate by a grinding wheel drive motor 62. The wheel head 61 is a wheel head feed motor 63.
Is controlled to move in the vertical direction of the drawing. The table feeding motor 53 and the grinding wheel head feeding motor 63 are constituted by servo motors, and the numerical controller 30 is provided for numerically controlling these. The numerical control device 30 mainly includes, as shown in FIG.
RA that is backed up by a CPU 31 and a ROM 32 that stores a control program, and that achieves basic shape pattern storage means
It comprises an M33, an input / output interface 34, and a pulse distribution circuit 35. The operation panel 20 is attached to the CPU 31 via an input / output interface 34. The operation panel of the operation panel 20
On the keyboard 21, a keyboard 22 for inputting data and a CRT display device 23 for displaying data are provided. Further, a pulse distribution circuit 35 is connected to the CPU 31, and drive circuits 36 and 37 for driving the table feed motor 53 and the grindstone head feed motor 63, respectively, include the pulse distribution circuit 35.
It is connected to the. A grinding cycle storage area 331 is formed in the RAM 33, and cylindrical grinding, as shown in FIGS.
A numerical control program for performing a grinding cycle such as cylindrical grinding with an arc, end face grinding, cylindrical grinding with an end face / arc is stored as a fixed cycle program. The RAM 33 also has a machining data storage area 33 for storing data such as the type of the grinding cycle, the end face, the finishing dimensions of the cylindrical portion, and the allowance for each of a plurality of machining points on the workpiece.
2 are formed. In the processing data storage area 332,
Finishing dimensions, grinding data automatically determined based on data such as machining allowance, grinding data such as fine machining allowance, fine grinding allowance, etc. are also stored. Grinding is performed according to the numerical control program corresponding to the grinding cycle and the grinding data. Further, a basic shape pattern area 333 for storing a basic shape pattern is formed in the RAM 33. Next, based on the flowcharts of FIGS. 3 and 4 showing the processing procedure of the CPU 31 used in the apparatus of this embodiment,
A description will be given with reference to FIG. 6 showing a procedure during a setup operation. When the apparatus is set to the data creation mode, the CPU 31 executes the program shown in FIG. In the upper part of FIG. 6, an outline drawing showing an example of the outline shape of the workpiece W is shown. First, in step 100, one continuous shape pattern corresponding to the outer shape of the workpiece W is selected from the basic shape patterns displayed on the screen of the CRT display device 23. In this case, since the connecting portion has an arc shape, it is used as a basic shape pattern. Select Next, proceed to step 102, where the selected basic shape pattern is selected. Is displayed on the screen of the CRT display 23 as shown in FIG. 7 (a). Next, the process proceeds to step 104 for achieving the data input means, and the data input screen shown in FIG. 7B is displayed, and the basic shape pattern displayed on the screen is displayed. Various dimensions and dimensions for each grinding part such as end face and cylindrical face
Input data such as grinding allowance. Thereafter, the process proceeds to step 106, where a grinding cycle is automatically selected based on the presence or absence of the end face portion, the cylindrical portion, and the allowance for the cylindrical portion. The details of this processing will be described later, but the number data representing the grinding cycle selected in this way is dimensional data,
It is stored in the processed data storage area 332 together with the allowance data. Next, the process proceeds to step 108, where the corner R and the like are calculated based on the input various dimension data, and the basic shape pattern displayed on the screen is enlarged and reduced and displayed. Then, in step 110, all the steps defined so far are combined and displayed. In step 112, it is determined whether or not the allowance of the cylindrical portion, the end face portion, and the like is zero. Thus, the ground surface is indicated by a solid line, and the non-ground surface is indicated by a broken line. Next, proceeding to step 114, it is determined whether or not the selection of the basic shape pattern for specifying the outer shape of the workpiece W and the shape definition by inputting data such as the dimension value thereof have been completed. If it is determined in step 114 that there is an undefined outer shape portion of the workpiece W, steps 100 to 114 are repeated, and when all the shape definitions for the outer shape of the workpiece W are completed, the process proceeds to step 116. . In step 116, processing data such as rough polishing allowance and fine polishing allowance is generated for each processing location based on the specified data such as various dimensions and allowances selected and input in steps 100 to 114 described above. It is stored in the storage area 332. Thereafter, the program ends. The details of the processing of automatic selection of the grinding cycle in step 106 are shown in FIG. 4. In step 150, it is determined whether or not the allowance of the cylindrical portion is zero. If the allowance of the cylindrical portion is zero, the process proceeds to step 152, where it is determined whether the allowance of the end face is zero.If the allowance of the end face is also zero, the shape is defined in step 154. The stored location is stored as a non-processed location. If it is determined in step 152 that the margin of the end face is not zero, the process proceeds to step 156 because only the end face is a ground portion, and the process proceeds to step 156, as shown in FIG. The edge grinding cycle is selected. If it is determined in step 150 that the allowance of the cylindrical portion is not zero, the process proceeds to step 158, where it is determined whether the allowance of the end face is zero. If it is determined in step 158 that the margin of the end face portion is zero, it means that only the cylindrical portion is ground, and the process proceeds to step 160, where it is determined whether or not the joint portion has an arc shape. If the joint has an arc shape, it is necessary to also perform the arc grinding on the joint, so the process proceeds to step 162, and a circular grinding cycle with an arc as shown in FIG. 8 (b) is selected. Steps
At 162, when it is determined that the connecting portion is not an arc shape,
Proceeding to step 164, a simple cylindrical grinding cycle without arcs is selected, as shown in FIG. 8 (a). Further, if it is determined in step 158 that the margin of the end face is not zero, it is necessary to grind both the cylindrical part and the end face. In this case, as in the case described above, it is determined in step 166 whether or not the connecting portion has an arc shape. If the connection portion has an arc shape, in step 168, as shown in FIG. If a cylindrical grinding cycle with an end face and an arc as shown is selected and the joint is not arc-shaped, a cylindrical grinding cycle with an end face as shown in FIG. Is selected. As described above, the number data indicating the grinding cycle selected in this way is stored in the machining data storage area 332 together with the dimension data and the allowance data. Further, as described above, grinding data such as a coarse grinding amount and a cutting speed necessary for executing each grinding cycle is automatically determined based on input data. FIG. 5 is a flowchart showing the operation of the CPU 31 at the time of machining. In step 200, the pulse distribution circuit 35 is operated by the indexing operation of the table so as to determine one machining location at the machining position. Distribute a predetermined number of pulses. Thereafter, the process proceeds to step 202, where the processing data storage area 3
Based on the stored contents of 32, the grinding cycle of the determined machining location is determined, and a numerical control program corresponding to this is selected. Then, the process proceeds to step 204 to perform pulse distribution for grinding in accordance with the selected numerical control program and the grinding data such as the fine grinding allowance stored in the machining data storage area 332. As a result, one location is processed to a finished size. If there is another processed portion, the process returns from step 206 to step 200, and the operations of steps 200 to 204 are repeated. The basic shape pattern selection means is step 100, the input screen display means is step 102, the data input means is step 104, the grinding cycle determination means is step 106, the control means is steps 200 to 206, and the identification display means is step 112.
It is composed of

【The invention's effect】

The present invention stores, as a basic shape pattern, a plurality of continuous shapes formed by combining a joint portion such as a corner R and a sunk portion between the end surface portion and the cylindrical portion and the end surface portion and the cylindrical portion between the end surface portion and the cylindrical portion, The basic shape pattern is selectively displayed on the screen, and data such as dimensions are input. The non-ground surface is input with a code indicating that the allowance is zero. At the time of grinding, the necessity of grinding the end face portion, the cylindrical portion, and the joint portion is determined by whether or not the sign indicates that the data of the machining allowance is zero, and a plurality of grinding cycles according to the determination result are performed. One of them is determined so that the grinding of the workpiece is controlled in accordance with the input dimensions and machining allowance. Therefore, depending on whether the sign of the data of the allowance is zero or not,
The grinding cycle is determined. That is, the operator can input a code that sets the data of the allowance to zero, and can prevent the surface from being ground. This eliminates the need for the operator to select the grinding cycle for each part in consideration of the designation of the grinding surface, thereby greatly improving the workability. Also, by inputting data on the margin of the end face and the cylindrical part for the displayed basic shape pattern of the continuous shape, the optimal grinding cycle can be selected from among a plurality of grinding cycles such as a cylindrical grinding cycle and a cylindrical grinding cycle with an end face. Is automatically selected, the operator does not need to define the shape of each of the end face and the cylindrical part as separate machining points, and does not need to select the grinding cycle. Further, there is an advantage that the processing time can be significantly reduced. In addition, when inputting data such as dimensions and grinding allowance for the basic shape pattern of continuous shape, the drawing size can be input as it is for the joint part, and the number of basic shape patterns to be stored is reduced and key input is also performed. This has the effect of reducing the number of times. Further, in the second invention, the ground surface and the non-ground surface on the basic shape pattern are displayed so as to be distinguishable depending on whether or not the sign indicates that the data of the allowance is zero. Since the grinding cycle that will be performed can be easily confirmed, the setup operation is shortened.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing the entire mechanical configuration of a numerically controlled grinding machine having a data creation device 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. FIGS. 3, 4, and 5 are flowcharts showing the processing procedure of the CPU 31 used in the apparatus of the embodiment. FIG. 6 is an explanatory diagram showing a procedure during a setup operation using the data creation device according to the present invention. FIGS. 7A and 7B are explanatory diagrams showing a data input screen. FIGS. 8A to 8E are explanatory views showing a plurality of grinding cycles. FIG. 9 is an explanatory diagram showing a procedure during a setup operation using a conventional data creation device. 20: Operation panel, 21: Operation panel 22: Keyboard, 23: CRT display device 30: Numerical control device, 50: Grinding machine 51: Bed, 52: Table 53: Table feed motor , 54… headstock 55… spindle, 56… tailstock, 57… tailstock 59… spindle motor, 60… grinding wheel, 61… grinding wheel 62… grinding wheel drive motor 63… … Wheel wheel feed motor, W …… Workpiece

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Claims (2)

(57) [Claims] 1. A numerical control device for a grinding machine for controlling a grinding process of a workpiece based on a designated basic shape pattern and input dimension data, comprising: an end surface portion and a cylindrical portion for grinding the workpiece; A basic shape pattern storing means for storing a plurality of continuous shapes formed by combining connecting portions such as corners R and a sewn portion between the end face portion and the cylindrical portion as a basic shape pattern; and A basic shape pattern selecting unit that enables a basic shape pattern corresponding to the outer shape of the workpiece to be selected by an operator from a plurality of stored basic shape patterns, and a basic shape pattern selecting unit that is selected by the basic shape pattern selecting unit. Input screen display means for displaying an input screen for inputting dimensions and allowance of the basic shape pattern; and a table displayed on the input screen display means. On the input screen of the indicated basic shape pattern, the data input means capable of inputting the non-ground surface with a code indicating that the machining allowance is zero, and a plurality of grinding cycles such as cylindrical grinding and cylindrical grinding with an end face are stored. Grinding cycle storage means, and whether or not grinding of the end face part, the cylindrical part, and the joint part is necessary is determined based on whether or not the data of the allowance input by the input means is a code indicating zero. Grinding cycle determination means for determining one of a plurality of grinding cycles stored in the grinding cycle storage means in accordance with a result; a grinding cycle determined by the grinding cycle determination means; dimensions input by the input means; Control means for controlling the grinding of the workpiece in accordance with an allowance, and a numerical control device for a grinding machine. 2. The numerical control device for a grinding machine according to claim 1, wherein the end face portion and the cylindrical portion are determined by whether or not the data of the allowance input by said input means is a code indicating that it is zero. Discriminating means for judging the necessity of the grinding process of the part and the joint part, and displaying the ground surface and the non-ground surface on the basic shape pattern selected by the basic shape pattern selecting means in a distinguishable manner. Numerical control device for grinding machine characterized by the following.