JP2685832B2 - Numerically controlled grinding machine - Google Patents

Description

The present invention relates to positioning control of a table of a numerical control grinding machine.

<Prior Art> Conventionally, for example, in an angular slide type numerically controlled grinding machine shown in FIG. 5, a grinding wheel G is configured to move in a direction intersecting the workpiece axis O at an angle of θ. Has become. At this time, the path S of the grinding wheel G and the workpiece W
An intersection point Pa with an axis O of is defined as an intersection point Pa.

Before grinding the workpiece W, in order to prevent the grinding wheel G from colliding with the workpiece W or a tailstock (not shown),
In advance, the operator sets a moving range of the table in which the grinding wheel G does not collide with the workpiece W or the tailstock, and when it is outside this range, the grinding wheel G is not advanced to perform safe grinding. It is carried out.

<Problems to be Solved by the Invention> In such a conventional one, the machining diameter Fa of the workpiece W is
When changing to Fb, it is necessary to move the table supporting the workpiece W (not shown) to the right in the drawing to change the position of the end surface of the workpiece W from the position a to the position b. In accordance with this, it is necessary to change the intersection point Pa (hereinafter referred to as the machining start position), which is the reference for positioning the table, to the intersection point Pb.

When the position Pa at this point of intersection is changed to Pb, the table may be moved in accordance with this range RP1 to R
Also for P2 (hereinafter referred to as the positioning area), it is necessary for the operator to reset the area from Ra to Rb again, and there is a problem that the work of changing the set values of the positioning areas RP1 to RP2 is complicated.

<Means for Solving the Problems> The present invention has been made to solve the above-mentioned problems, and as shown in the block diagram of FIG. 1, a table position detecting means 100 for detecting the position of a table. A machining start position storage means 101 for storing a machining start position, and a position range of the table such that the grindstone wheel does not interfere with the workpiece and the headstock when the grindstone advances forward in a direction approaching the workpiece by fast-forwarding. Positioning area storage means 10 for storing
2, the positioning area setting means 103 for setting the position range in the positioning area storage means 102, the table position detection means 100 and the values of the positioning area storage means 102 are compared, and the table is positioned. Positioning determination means 104 for determining, processing diameter storage means 105 for storing the processing diameter of the cylindrical portion of the workpiece, processing diameter setting means 106 for setting the processing diameter in the processing diameter storage means 105, and the processing diameter storage means The processing diameter of 105 is provided with a positioning area correction means 107 for correcting the value of the positioning area storage means 102 according to the processing diameter by the values of the processing start position storage means 101 and the positioning area storage means 102. It is a feature.

<Operation> The positioning area setting means 103 can set a position where the grinding wheel can grind a workpiece in the positioning area storage means 102, and the processing diameter setting means 106 allows the processing diameter storage means 105.
The machining diameter to be machined can be set, and the positioning area correction means 10
The positioning area is calculated based on the machining start position by 7 and the value of the positioning area storage means 102 is corrected. Based on the positioning area corrected by the positioning area correction means and the table position detection means 100 by the positioning determination means 104. Determine whether the grinding wheel is in a position where it can move forward.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 10 denotes an angular slide type grinding machine,
20 is a numerical controller. The grinder 10 is provided with a grindstone base 11 for supporting a grindstone G on a bed 15, and a work table 13 for mounting a headstock Sa and a tailstock Sb.

The wheel head 11 and the work table 13 are provided with a drive circuit 1
Servo motors 12,1 which are respectively driven to rotate by 6,17
4 to be moved. Absolute encoders 18 and 19 for detecting the rotational positions of the servo motors 12 and 14 as absolute positions are connected to the servo motors 12 and 14, respectively.

Output signals of the absolute encoders 18 and 19 are input to the CPU 21 via the interface 29.

The numerical controller 20 comprises a CPU 21, a RAM 24, a ROM 25, a pulse generator 23, interfaces 26, 27, 28, 29, and command pulses sent from the pulse generator 23 are supplied to the drive circuits 16, 17. The RAM 24 has a machining start position storage area 241, a positioning area storage area 242, a machining diameter storage area 243, and a table present position storage area 244 for storing the machining start position.

The ROM 25 stores a control program, an angle θ at which the axes of the grinding wheel G and the workpiece W intersect, and the like.

A display control circuit 37 is connected to the interface 26, and a display device 38 is connected to the display control circuit. In addition, the interface 27 includes the areas 241, 2 of the RAM 24.
A keyboard 36 for setting data in 43 and 244, a manual pulse generator 39, and a bubble cassette input / output device 34 for connecting a bubble cassette storing NC data are connected.

Reference numeral 60 denotes a sizing mechanism 60 that outputs an external positioning signal for indexing the position of the end surface Wt of the work W, and is slidable on the bed 15 in the U-axis and V-axis directions. The positioning of the sizing mechanism 60 in the U and V axes is performed by a sizing device 61, and when the contact 62 comes into contact with the end surface Wt of the workpiece W, an external positioning signal is numerically transmitted through the sizing device 61. It is output to the control device 20.

Reference numeral 40 is a sequence controller, and when a numerical control device 20 gives a positioning command for the sizing mechanism 60, the sizing device 61
A positioning command is given to position the sizing mechanism 60 in the U-axis and V-axis directions.

Next, regarding the operation of the CPU of the numerical control device 10 when numerically controlling the angular slide type grinding machine 10 by the numerical control device 20 in the above-mentioned configuration, the table positioning shown in FIGS. Description will be given based on a diagram for explanation.

First, before processing the workpiece W, the operator
The processing start position Pa (position with reference to the origin of the table 13), the positioning area RP, and the processing diameter R are input to the RAM 24 via the RAM 36.

After such data input is completed and the operator supports the work W between the headstock Sa and the tailstock Sb on the table 13, the NC program stored in the RAM 24 (not shown) causes the work W to be stored. Perform processing. When the machining diameter R of the workpiece W is to be changed after this machining, the operator can use the keyboard.
The machining diameter R is stored in the RAM 24 via 361. Next, the NC program is executed, and when the indexing instruction of the table 13 is read, the processing shown in FIG. 3 is performed to obtain the position correction value H for the indexing of the table 13.

In step 200, the angle θ is read from the ROM 25, and in step 201, the machining diameter R stored in the RAM 24 is read. In the next step 203, the correction value H of the machining start position Pa is calculated by the following equation (1).

Next, the operator operates the keyboard 36 to operate the workpiece W.
When a command to start grinding is given and the G code for indexing the table 13 is read, in addition to the indexing to the machining start position Pa of the table 13 by the NC program, the processing shown in FIG. To do.

In step 300, the current position of table 13 (table 1
Position of intersection point Pa with reference to origin of 3) Read TP. In the next step 301, the current position TP of the read table 13 is
And a value obtained by subtracting the value of the correction value H obtained in step 201 from the minimum position RP1 of the positioning area Ra are compared. If this determination is YES, the process proceeds to the next step 302, and a value obtained by subtracting the correction value H obtained in step 203 from the current position TP of the table 13 and the maximum position RP2 of the positioning area Ra is compared. If this determination is YES, it is determined that the table 13 is positioned in the positioning area RPb, and in the next step 303, the positioning area signal PSW indicating that the table 13 is in the positioning area RPb is output to the sequence controller 40. Then, the sequence controller 40 checks the positioning area signal PSW and various conditions, and if the conditions are satisfied, the sequence controller 40 sends to the numerical controller 20 a signal indicating that the conditions are satisfied. The numerical controller 20 receives the signal and stops the movement of the table 13 to complete the indexing.

If the determinations at steps 301 and 302 are NO, it is determined that the table 13 is not positioned at a workable position, and this processing ends.

In this way, the positioning area can be changed only by inputting the machining diameter to be changed.

In this embodiment, the example of the angular slide type numerical control grinder is described, but the present invention is also applicable to the orthogonal slide type numerical control grinder.

<Effects of the Invention> As described above, according to the present invention, the table position detecting means for detecting the position of the table, the processing start position storing means for storing the processing start position, and the rapid movement in the direction in which the grinding wheel approaches the workpiece. Positioning area storage means for storing a position range of the table such that the grinding wheel, the workpiece, and the headstock do not interfere with each other when moving forward, and a positioning area setting means for setting the position range in the positioning area storage means. Positioning determination means for comparing the values of the table position detection means and the positioning area storage means to determine that the table is positioned, and a machining diameter storage means for storing the machining diameter of the cylindrical portion of the workpiece. Machining diameter setting means for setting the machining diameter in the machining diameter storage means, machining diameter of the machining diameter storage means, the machining start position storage means and the position Since a positioning area correction means for correcting the value of the positioning area storage means according to the value of the determined area storage means is provided, the operator inputs the processing start position of the table and the processing diameter of the workpiece. Since the advanceable region of the grinding wheel head can be changed only by itself, there is an advantage that the work of the operator can be simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram for clarifying the present invention, FIG. 2 is an overall configuration diagram of an angular slide type grinding machine of the present invention, and FIGS. 3 and 4 are flow charts for explaining the operation of a CPU. FIG. 5 is a diagram for explaining the positioning of the table. 12,14 …… Servo motor, 18,19 …… Absolute encoder, 21 …… CPU, 24 …… RAM, 36 …… Keyboard, 38
...... Display device, 40 …… Sequence controller, 61 ……
Sizing device.

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Claims (1)

(57) [Claims] 1. A headstock and tailstock on a table support a workpiece having a cylindrical portion and a shoulder portion, and after detecting the end face position of the shoulder portion, the table is positioned at a machining start position. , A numerical control grinder for advancing and retracting a grinding wheel to grind a shoulder portion and a cylindrical portion of a cylindrical workpiece, a table position detecting means for detecting a position of the table, and a processing start position for storing the processing start position. Storage means, and a positioning area storage means for storing the position range of the table such that the grinding wheel, the workpiece and the headstock do not interfere with each other when the grinding wheel moves forward in the direction of approaching the workpiece. The positioning area setting means for setting the position range in the positioning area storage means is compared with the values in the table position detection means and the positioning area storage means to compare the values. Positioning determination means for determining that the table has been positioned, processing diameter storage means for storing the processing diameter of the cylindrical portion of the workpiece, processing diameter setting means for setting the processing diameter in the processing diameter storage means, and The machining diameter of the machining diameter storage means is provided with a positioning area correction means for correcting the value of the positioning area storage means according to the machining diameter based on the values of the machining start position storage means and the positioning area storage means. And numerical control grinder.