JPS58137556A - Cut-to-size end positioning control device - Google Patents

Abstract

PURPOSE:To reduce the movement of a table at the time of positioning of a next work by allowing a device to store the indexing amount of the table when positioning a work reference surface to a cut-to-size end position. CONSTITUTION:A work W is rotatably kept by a spindle head 25 and a tailstock 26 on a table 21. When a new kind of work is processed, the table 21 is shifted by a pulse motor 22 in the +Z direction, and then, moved in the -Z direction with a low speed until the end Wp1 of the work W touches a measuring probe 36. The position of the table 21 at this time is stored. After the processing of the work by a grindstone G, another work is mounted to the device. The work has an axial error caused by the error of a center hole depth, so that it is quite enough to set the feed in the -Z direction to the minimum necessary amount as the maximum error of the center hole depth.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an end face sizing positioning control device for an angular grinding machine. The purpose is to facilitate the setting and automate the sizing positioning of each workpiece after setting, thereby shortening the cycle time.

In general, in an angular grinding machine, the axial positioning of a workpiece supported at one center is determined by the machine's unique origin (machining diameter
(the position of the end face of the grindstone) or a coordinate system relative to the origin of the table which is spaced a certain amount from the origin. However, since the individual workpieces supported at the center have dimensional variations in the depth of the center hole, unless these dimensional variations are corrected, the workpieces cannot be accurately positioned and the machining accuracy cannot be fully improved. In order to compensate for all such dimensional variations, all end face sizing devices are installed on the bed, the feeler is brought into contact with the workpiece reference surface, the table is fed, the workpiece is positioned at the full sizing position on the workpiece reference surface, and this point is set as the reference point. The position of each machined surface is determined by

However, it is very difficult to calculate the table indexing amount for fully positioning the workpiece at the sizing position of such an end face sizing device from the drawing, and it is difficult to program it before machining. If you want to program the entire index amount, move the measured end face sufficiently beyond the feeler engagement position of the end face sizing device, then command the end face sizing device to move forward and the table to return in the opposite direction. Full value must be given. For this reason, a program is created that takes into account a sufficient extra stroke for the feeler engagement position, and the cycle time increases by the time required to move by this extra stroke. In particular, when returning the filler to the engagement position, a very slow speed is required so that the end face sizing signal stops the moment it turns ON.
In this case, sending at a speed of 100-7 minutes would take 20 seconds, resulting in a large time loss. In the case of lot production, such a time loss occurs for each workpiece, and it is not possible to achieve the same processing efficiency.

By the way, when considering loft production, when changing setups due to workpiece changes, the workpiece reference surface is positioned at the end face sizing position using jog feed, the table index amount at this time is memorized, and the end face sizing of the next work is done. If the positioning operation is controlled based on the stored table indexing amount, the margin stroke can be set to the minimum necessary value as the maximum value of the variation in center hole depth.

In view of this, the present invention is designed to significantly shorten the cycle time by performing end face sizing positioning using playback control.Examples of the present invention will be described below with reference to the drawings.

In FIG. 1, 21 is a work table that is slidably guided in two axial directions along a guide surface formed on the front surface of the bed 2α, 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 grinding wheel stand that supports an angular-shaped grinding wheel G that has a cylindrical surface Ga parallel to the spindle axis 08 and an end surface □b orthogonal to this cylindrical surface Ga. A feed screw 31 is slidably guided along a guide surface formed in the direction of the X-axis that intersects the Z-axis at an acute angle θ, and is connected to a pulse motor 30 via a nut 28. are screwed together. 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 zo and is movable back and forth, and has a probe 36 that contacts the reference surface WPs of the workpiece W.
By moving 1, the reference plane Wl)l'ft is positioned at the sizing point, and a workpiece coordinate system, which will be described later, is set.

10,000, 40 indicates a numerical control device TT constituted by a computer, etc., which is connected to a data input device 42 and a manual pulse generator 4 through a flash interface in addition to a memory 41.
3. Operation panel 44 for commanding jog feed, etc. Command switches 031 to O8 for commanding start of machining and table indexing amount memory
2 are connected. The numerical control system @40 is a drive unit DUZ that drives the rotor and pulse motor 22.30i respectively when commanded to start machining or position the table.
, distributes command pulses to the DUX, and outputs the command pulses to the work table 21.
And the entire grindstone head 27 is moved.

45 and 46 are position detection counters that reversibly count all the positive and negative command pulses distributed to the drive units DUZ and DUX, respectively, and output position data Dz and Dxf representing the current position 2 of the work table 21 and the grinding wheel head 27. Yes, this position detection counter 45.4
The device data DZ and DX consisting of 6 can also be read into the numerical control device 40 via the flash interface 7 and 8. In this embodiment, the position of the grinding wheel head 27 where the cylindrical surface Ga of the grinding wheel G coincides with the spindle axis OB 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 The distance from this reference position to the cylindrical surface Ga and the main shaft 1 are measured.
The distance to sOs is shown in full diameter representation. Further, the reference position of the work table 21 is a table origin return position where the work table 21 is indicated by a two-dot chain line in FIG.
The device data DZ composed of the counter 45 completely represents how far the work table 21 has moved to the left from the table origin.

Here, the machine origin Q5 is the position of the end face of the grindstone when the grindstone cylindrical surface Ga coincides with the spindle axis OB, and this point Q is a point that does not move even if the grindstone head 27 moves or the table 21 moves. It is. The table origin Ql is also the point at which the origin detector 47, which is provided at a predetermined distance from the mechanical origin Q, detects the nine-shot magnetic body 48 on the table. The counter 45 is reset to zero when the table returns to its origin, and counts table movement command pulses to represent the entire current position of the table.
This state becomes the mechanical coordinate system. Although such a machine coordinate system accurately represents the entire position of the table, the position of the workpiece that is centrally supported on the table is not determined due to variations in the depth of the center hole. Therefore, it is necessary to position the workpiece reference surface at the sizing point using the end face sizing device 35 provided on the bed 20. Since the amount of indexing up to the sizing point is not known for the first workpiece after setup change, it is done as follows.

First, the grindstone head 27 is retreated, and as shown in FIG.
1 passes the feeler 36, the end face sizing device 35
The table 21 is moved forward, and then the table 21 is moved all the way to the right, and jog feed is performed until the end face sizing signal is turned ON to position it at the sizing position S. The table current position display in this state is zl, and when the command switch 0821 is pressed, the process shown in the flowchart in FIG. The end face positioning of the workpiece is performed based on this value 21, as will be described later. Here, as shown in FIG. 3, the end surface W that contacts the feeler 36 with respect to the left end reference surface Wp of the workpiece
l) The dimension with t is l □If the coordinate value of the end face sizing point S with respect to the machine origin Q is Zll, the coordinate value z12 of the workpiece left end reference plane Wp with respect to the machine origin Q is Z12= lI Z
ll, and this coordinate value z12 becomes the value of the workpiece coordinate system. Although the counter 45 has a coordinate value 21G in the machine coordinate system, by changing the setting to the coordinate value Zl, the setting can be changed from the machine coordinate system to the workpiece coordinate system.

After setting the workpiece coordinate system, the cutting program is configured such that the dimension 11 from the left end reference plane wp of the workpiece to the processing end surface WP1 and the diameter d1 of the processing cylindrical portion are input. In this case, in order to accurately position the workpiece at the processing position, the reference plane Wp must be set at the coordinate value z in FIG.
Make it 2□. This calculation is performed by all computers, and the table 21 is positioned so that the value displayed on the counter 45 is equal to 21, and the grindstone head 27 is moved forward to the position where the value displayed on the counter 46 is equal to dl. , grinding of the machined area is performed.

The stored value Zl serves as a command value when positioning the work reference plane for the second and subsequent wood grains at the end face fixed size position in loft production. First, the command value for moving the table 21 to the left from the table's original position is determined by αma, which is the maximum value of the center hole variation.
If it is X, then it becomes 21-1-arnw, which is the minimum necessary feed command value for the workpiece reference plane WP1 to pass the end face sizing point S. Therefore, after this feeding operation, the end face sizing device 35 is advanced and the table 2 is moved forward until the end face sizing signal is output.
All you have to do is program a command to move 1 to the right. The amount by which the workpiece reference surface Wpt overruns all of the sizing points is the maximum value of the center hole variation amount, and is usually around one lobe, so the end face positioning cycle can be significantly shortened in time. In addition, the end face positioning index amount can be set and memorized with an extremely simple operation of positioning only the first workpiece in lot production to the fixed size point by jog feeding and pressing the command switch O32 fully, and from the second work onwards, the memorized index amount can be set and memorized. End face positioning is achieved automatically and with high efficiency based on the quantity.

As described above, according to the present invention, since the end face positioning operation is performed by a kind of playback function, there is an advantage that the problems of the conventional method are solved.

[Brief explanation of the drawing]

The drawings show all the embodiments of the present invention, and FIG. 1 is a plan view of an angular grinding machine with a control block diagram, FIG. FIG. 3 is an explanatory diagram of workpiece coordinate system setting and machining operation, and FIG. 4 is a flowchart for storing all index amount settings. 20... Ped, 21... Table, 27... O. Grindstone head, 35... End face sizing device, 40. O. Numerical control device, 41... Memo IJ, O32... Index amount Setting memory command switch, Qll fist/machine origin, Q□... table origin, S... end face sizing position. Patent applicant Toyota Machinery Co., Ltd.

Claims (1)

[Claims] (1) A control device that positions the workpiece reference surface at the sizing position of the end face sizing device attached to the bed of the angular grinder, and is used to move the table that supports all the centers of the workpiece relative to the table origin, which has returned to its original position. means for detecting the current position of the table, means for moving the table by jog feed to position the reference surface of the workpiece at the sizing position of the end face sizing device; End face sizing positioning control having a means for reading and storing the entire current table position, and a control means for fully automatically controlling table feed based on the stored value when positioning the next workpiece at the sizing position, and positioning the table at the sizing position. Device.