JPS58132606A - Apparatus for setting coordinate value of fixed position of end surface - Google Patents

Abstract

PURPOSE:To make it possible to set the coordinate values of the fixed position by simple manipulation, by effectively utilizing the displayed values of the present position of a table in an angular grinding machine. CONSTITUTION:The coordinate values of the fixed position S of an end surface fixing device 35, which is attached to a head 20, with respect to an original point Q of a machine are set. The table 21 supports the center of a master work Wm having an outer diameter (d) at a circular cylinder surface. The amount of movement of the table 21 with respect to an original point Q is detected, and a size (d) is inputted into a numerical control device 40. Then the table 21 is moved. A present position Z1 of the table under the state the end surface of the work Wm is positioned at S is stored in a memory 41. The table 21 and a grindstone stand 27 are positioned so that the end surface and the cylinder surface of the work Wm are contacted with the end surface and the cylinder surface of the grindstone. A present position Z2 of the table under this contact state is read. Based on the size (d) and the value z1, an expression, z1-z2-d/2tantheta is operated, and the result is stored in the parameter area of the device 40.

Description

[Detailed description of the invention] The present invention relates to setting the coordinate values of the sizing position of an end face sizing device attached to the bed of an angular grinding machine, and its purpose is to set the sizing position when replacing a filler or changing workpiece setup. To easily and accurately set coordinate values with respect to changes in

In general, in angular grinding machines, the axial positioning of the workpiece supported at the center is determined by the machine's own origin (machining diameter 0).
position of the grindstone end surface) or the table origin which is spaced a certain amount from the origin -.

However, individual workpieces that are supported at the center have dimensional variations in the depth of the center hole relative to the workpiece reference surface.
Unless this dimensional variation is corrected, the workpiece cannot be positioned accurately and machining accuracy cannot be improved. In order to completely correct such dimensional variations, an end face sizing device is installed on the bed, a feeler is brought into contact with the workpiece reference surface to feed the table, and the workpiece reference surface is positioned at the sizing position. All positioning of each machined surface is done using the reference.

However, the sizing position of the end face sizing device changes as the filler is replaced due to wear or breakage, and the end face sizing device is moved back and forth in order to correspond to changes in the radial direction of the feeler contact position on the end face of the workpiece. It may also change if That is, if the front-rear movement direction of the end face sizing device is not perpendicular to the center axis, the sizing position will be deviated.

When the sizing position changes in this way, it is necessary to completely reset the coordinate values of the sizing position with respect to the machine origin, but changing the setting of such coordinate values has conventionally been very complicated and difficult to do.

For example, even if the sizing position changes, the entire workpiece is positioned at the machining position based on the coordinate values before the change, and after trial grinding to the predetermined size, the machining diameter and the dimensions of the machining end face from the workpiece reference end face are accurately determined. Measurements were taken to calculate the error from the standard dimensions, and the previous coordinate values were corrected based on this error, and the corrected coordinate values were reset.

This requires a special measuring device, requires complicated calculations, which results in a lot of time loss, and only experienced technicians can perform such work.

In view of these points, the present invention aims to make it possible to set the coordinate values of the sizing position with a simple operation by effectively utilizing the current position display value of the table. The explanation will be based on the drawings.

In FIG. 1, 21 is a work table that is slidably guided in the X-axis direction along a guide surface formed on the front surface of the bed 20, and this work table 21 is driven by a feed screw driven by a pulse motor 22. It is screwed into 23.

A headstock 25 and a tailstock 26 are placed on the work table 21, and the workpiece W is rotatably supported by the center of the headstock 25 and tailstock 26.

Further, reference numeral 27 denotes a whetstone stand on which an angular-shaped grinding wheel G having a cylindrical surface Ga parallel to the spindle axis Os and an end face Gb orthogonal to this cylindrical surface Ga is mounted. The nut 28 is slidably guided along the formed guide surface in the X-axis direction that intersects the Z-axis at a mirror angle θ. The feed screw 31 is connected to the pulse motor 30 via the feed screw 31 . In addition, pulse motor 3
The pitch of the feed screw 31 is set such that when the grinding wheel G rotates for one pulse, the cylindrical surface Ga of the grinding wheel G moves by a predetermined unit movement amount in a direction orthogonal to the spindle axis 08.

Further, on the side surface of the tailstock 26 on the side of the grindstone 27, a grindstone correction tool DT is provided which protrudes in a direction substantially parallel to the moving direction of the grindstone 27. Reference numeral 35 denotes an end face sizing device that is supported on the bed 20 and is movable back and forth, and has a feeler 36 that contacts the reference surface WPt of the workpiece W. By completely moving the table 21, the end face sizing device 35 is able to move the reference surface ftt to a constant dimension point. Position.

On the other hand, 40 is a numerical control device constituted by a computer, etc. In addition to the memory 41, a data input device 42 and a manual pulse generator 43 are connected via a circuit interface.
, a jog feed operation panel 44, and command switches 081 to 083 for instructing to start, to read the current position of the first table, and to read the current position of the second table, respectively. When the numerical control device 40 receives a command to start machining or to feed the jaw ζ, it distributes command pulses to the drive units DUZ and DUX that drive the pulse motors 22 and 30, respectively, and moves the work table 21 and the grindstone head 27.

45 and 46 are drive units DUZ and DUX
Ic is a position detection counter that reversibly counts the positive and negative command pulses distributed respectively and outputs position data Dz and Dx\ representing the current positions of the work table 21 and the grindstone head 27, and this position detection counter 45
．． The device data DZ and DX consisting of 46 can also be read into the numerical control device 40 through all circuit interfaces. In this embodiment, the position of the grinding wheel head 27 where the cylindrical surface Ga of the grinding wheel G is in contact with the spindle axis Os is the reference position of the grinding wheel head 27, and the device data Dx constituted by the counter 46 indicates that the grinding wheel head 27 is at this position. The distance between the cylindrical surface Ga and the main shaft axis Oe is indicated by the diameter to indicate how far the cylinder is retreated from the reference position. The reference position of the work table 21 is the table origin indicated by the two-dot chain line in FIG. It represents something.

Here, the machine origin Q is the position of the end face of the whetstone when the whetstone cylindrical surface Ga coincides with the spindle axis 08, and this point Q is a point that does not move even if the whetstone head 27 moves or the table 21 moves. It is. Also, as the table origin Ql,
This is also the point at which the origin detector 48, which is provided at a point a predetermined distance from the machine origin, detects all four magnetic generator axes provided on the table. The counter 45 is reset to zero when the table returns to the origin Q, l, and counts all the table movement command pulses to represent the current position of the table.

As the sizing position of the end face sizing device 35, accurate coordinate values with respect to the machine origin Q must be detected. This coordinate value can be detected as follows. Retract the grindstone head 27 and move the table 21 to the table origin Q1
to be restored. As shown in FIG. 2, a master workpiece Wm having an end face part WPt and a cylindrical part wa and a known diameter d of one cylindrical part is supported at the center, and the table 21 is moved to the left by jog feed, and the reference end face is At the point where w1:11 passes the filler 36, the end face sizing device 35 is advanced, and the table is then moved to the right and jog-fed until the end face sizing signal is turned on to position it at the sizing position S. Note that the diameter dimension d of the master workpiece is input into the numerical control device 40 using the data input device 42. The table current position display in this state is 2. When the switch 082 instructing to read the current position of the first table is pressed, the process shown in chart 70 in FIG. 4 is performed and the contents of the counter 45 are read. is read and stored in a predetermined area of the memory 41. Next, grindstone head 2
7 is moved forward by jog feed, and the table 21 is further moved to the right to position the grindstone end surface and the grindstone cylindrical surface so that they simultaneously contact the end surface and cylindrical surface of the master work Wm. In this case, it is preferable to check the contact state while rotating the grindstone by hand without starting the grindstone drive motor. That is, the inertial rotating grindstone stops rotating when it comes into contact with the master work, making contact confirmation easy, and the work is not ground.

The table current position display in this contact confirmation state is z
2, and the current position display of the grindstone head matches the known dimension d. When the switch O33 for instructing to read the current position of the second table is fully pressed, the process shown in the flowchart of FIG. 5 is performed and the contents z2 of the counter 45 are read.

Along with this, Kzl and the known dimension d are also read out, and the coordinate value z3 of the sizing position S with respect to the machine origin Q is calculated by the computer built in the numerical control device 40 using the following formula, and the calculated coordinate value z3 is specified in the memory 41. is stored in the area.

The coordinate value z3 of the sizing position S is set in the counter 45, which represents the coordinate value z2 of the workpiece reference plane Wp1 with respect to the machine origin Q, and is used when changing the coordinate system setting from the machine coordinate system to the workpiece coordinate system. Ru. Next, the workpiece coordinate system setting will be explained. As shown in FIG. 3, the workpiece W to be machined instead of the master workpiece is supported at the center, and then the workpiece end face WXlt is positioned at the sizing position where the end face sizing signal is turned ON. If the workpiece left end surface wp is the workpiece reference plane, the coordinate value of this reference plane wp with respect to the machine origin Q is 212
The workpiece coordinate system is expressed by k. Incidentally, the machine coordinate system represents the coordinate values Z and o of the reference plane wp with respect to the table origin Q1, and in this state, the counter 45 representing the current table position has the coordinate value z1o, and the contents of this counter 45 By presetting to Th 212, the setting is changed to the work coordinate system. This coordinate value z1□ is the end face WP with respect to the reference plane wp.
This is the value obtained by subtracting the coordinate value Zll of the fixed size position S from the dimension 11 of t. Since the depth of the center hole varies from workpiece to workpiece, the workpiece coordinate system is set by positioning each workpiece at a fixed size position prior to machining.

After setting the workpiece coordinate system, the cutting program is designed to input the dimension 11 from the workpiece reference plane to the machining end surface and the diameter aITh of the cylindrical part to be machined. In this case, in order to accurately position the workpiece at the processing position, the reference i11hp is set to the coordinate value 221 in FIG. This coordinate value z2□d1 is determined by 112tanθ, and this calculation is performed by the computer, and the displayed value of the counter 45 becomes z21.
The table is positioned so that the grinding wheel head 2 is equal to
7 is fed forward to a position where the value displayed on the counter 46 becomes equal to dl, and the processing location is ground.

As described above, according to the present invention, even if the end face sizing position changes due to replacement of the feeler, etc., the workpiece base 7 remains at the sizing position.
It is possible to position the table at the first position where the entire surface is positioned and at the second position where it contacts the grinding wheel, read the entire current position of the table, calculate all the coordinate values of the sizing position relative to the machine origin, and store them. Set the workpiece coordinate system before starting the machining operation All workpiece geometry dimensions (il) (dl)
It has the advantage that not only can the coordinate system be set automatically, but also high accuracy can be achieved through automation of the coordinate system setting.

[Brief explanation of drawings]

The drawings show all the embodiments of the present invention. Fig. 1 is a plan view of an angular grinding machine with an Ij control system block diagram, Fig. 2 is an explanatory diagram of the detection operation of the end face sizing position, and Fig. 3 4 is a diagram showing the workpiece coordinate system setting and the relationship among the workpiece, grindstone, and end face sizing device during machining, and FIGS. 4 and 5 are flowcharts showing the process for detecting the coordinate values of the sizing position. 20...Bed, 21.Fist/Table, 25...Spindle head, 26...Psychological table, 27...Whetstone stand) 35...
・End face sizing device, 40...Numerical control device-41...
Memory, 45.46...counter. Patent applicant Toyota Machinery Co., Ltd. Figure 5, Figure 4

Claims (1)

[Scope of Claims] A device for setting the coordinate values of the sizing position of an end face sizing device attached to the bed of an angular grinding machine with respect to the machine origin, the cylindrical surface having the entire end face at one end of the cylindrical surface. table current position detection means for indicating the amount of movement relative to the table origin of a table that centrally supports a master work whose outer diameter dimension is the bottom value dimension d; input means for inputting the bottom value dimension d into a numerical control device; Means for moving and positioning the end face of the master workpiece at the sizing position of the end face sizing device, and the current position of the table in the state where it is positioned at the sizing position! means for reading and storing IEZt; means for positioning the table and grinding wheel head so that the end face and cylindrical surface of the master workpiece contact the end face and cylindrical surface of the angular grindstone; and means for reading the current position z2 of the table in the contact state and From the dimension d of the ta value and the stored value zl, zl-22,2taaz
θ (bait θ is the angle between the grinding wheel rotation plane and the center line)
and means for calculating and storing the calculated values in a parameter storage area of the numerical control device.