JPS5866649A - Numerically controlled cylindrical grinder of angular type - Google Patents

Abstract

PURPOSE:To easily set a program of a computer in no relation to the tilt ange of a cutting direction, by aligning a radius change amount to a rotary amount in speed change ratio of a speed changer and providing the speed changer between a feed motor and feed screw of a grinding wheel head. CONSTITUTION:A speed changer 32 is interposed between a feed screw 30 and feed motor 28. Z1 and Z2 are assumed respectively for a number of teeth of a driving gear 33 and that of a transmission gear 34. Assuming X for a radius change amount of a work 13, theta for a tilt angle in the cutting direction of a grinding wheel 16 for a rotary center line 14 of the work 13, L for a lead of the feed screw 30 and beta for a unit rotary angle of the motor 28, and X=L.sintheta. (beta/360). (Z1/Z2) is determined. Setting to sintheta=Z2/Z1, in no relation to a value of angle theta, can set a radius change amount X of the work 13 unconditionally for the unit rotary angle beta of the feed motor 28.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an angular numerically controlled cylindrical grinder in which the cutting direction of the grinding wheel is inclined with respect to the center line of rotation of the workpiece, and in particular, the present invention relates to This is intended to match the cutting command value.

An angular type numerically controlled cylindrical grinder in which the cutting direction of the grindstone is inclined with respect to the rotation center line of the workpiece is shown in Fig. 1 showing its planar shape and Fig. 2 showing the sliding mechanism of its grinding wheel head. As shown, the cutting direction of the headstock 11 and the tailstock 12 rotatably clamped is inclined by θ degrees.

Guide surface 181c# formed on bed 17 of this grinder
-i, table 19 movable along this guide surface 18;
is placed on this table 19, and a resolver 20 is placed on this table 19.
A feed screw 23 connected to a feed portion motor 21 via a stitch 22 is screwed together. The headstock 11
12 tailstocks are attached to a swivel table 24 that is rotatably installed on the table 19. On the other hand, the grindstone head 15 is placed movably along a guide surface 26 of a grindstone slide stand 25 provided on a bed 17, and the grindstone head 15 is connected to a feed motor 28 with a resolver 27 attached thereto. A feed screw 30 connected via 29 is screwed together. The grindstone 16 is driven by a grindstone motor 31 whose head is mounted on the grindstone head 15 .

In a numerically controlled cylindrical grinder, the unit rotation angle of the feed motors 21 and 28 is set in advance by the resolver 20° 27, and accordingly, the unit feed amount is also set to 0,0, for example.
005 familiar, 0.001 wm, 0°002run,
A round number such as 0.005w is determined. Generally, the lead L of the feed screw 23°30, the unit rotation angle β of the feed motor 21.28, and the unit feed amount are in an insignificant relationship, and the feed motor 21 is set so that L is an integer.
, 28 coronation rotation angles β are set.

In the angular type, the cutting direction of the grinding wheel 16 is inclined by θ with respect to the rotation center line work 4 of the workpiece 13, so when the grindstone head 15 is fed by 81, the cutting direction of the workpiece 13 is The amount of displacement X in the direction perpendicular to the rotation center line 14 is X1=81@sinθ. Therefore, when setting the amount of change in radius X of the workpiece 13 to be ground, it is necessary to always take θ into account, calculate the command value I of the feed motor 28, and program it into the computer, which is extremely inconvenient. It had become.

In view of the fact that the above-mentioned angular contact type cylindrical grinding machine has a drawback due to the mismatch between the amount of change in radius of the workpiece and the cutting feed amount of the grindstone, the present invention provides an angular contact type cylindrical grinding machine that can eliminate this drawback. The aim is to provide all.

The configuration of the angular type cylindrical grinding machine of the present invention that achieves all of the above objectives is based on angular type numerical control in which the cutting direction of the grindstone is inclined by θ degrees with respect to the rotation center line of the workpiece that is rotatably supported. In a cylindrical grinding machine, the grinding wheel is screwed onto a grindstone head that supports the grindstone, and the feed screw is inclined by θ degrees with respect to the rotation center line and has a lead of L, and the feed screw is driven, and the unit rotation angle is β. The present invention is characterized in that it is connected to a motor for cutting by the grindstone via a transmission having an overlapping gear ratio for cutting by the grindstone.

Hereinafter, an embodiment in which the angular cylindrical grinder according to the present invention is applied to the conventional one shown in FIG. 1 will be described in detail with reference to FIG. 3, which shows the cross-sectional structure of the main part thereof. Note that the table side that supports the object to be ground may be the same as the conventional one, so its explanation will be omitted and will be described using the reference numerals shown in FIG. In the present invention, the feed screw 3
A transmission 32 is interposed between L7 and the feed motor 28, and if the number of teeth of the drive gear 33 of the feed motor 281111 is z, and the number of teeth of the transmission gear 34 on the l feed screw 30 side is z2, then The radius change amount of the object to be ground 13 is X, the object to be ground 13
The inclination angle of the cutting direction of the grindstone 16 with respect to the rotation center line 14 is θ.

Since the lead length of the feed screw 30 and the unit rotation angle of the feed motor 28 are β, the following equation is obtained. By setting 2θ1nθ=□1, it is possible to uniquely set the radius cost iX of the workpiece 13 for the unit rotation angle β of the feed motor 28, regardless of the value of θ. The rotation angle of the feed motor 28 and the amount of change in radius X of the object to be ground 13 correspond one-to-one. From this, the gear ratio of the transmission 32 should be 360 Lssinθ, and when gears 33 and 34 as in this embodiment are used, the number of teeth should be set so that Z+ 1 Z2 sinθ. If θ cannot be easily changed, the transmission 32 is preferably continuously variable.

As described above, according to the angular type numerically controlled cylindrical grinder of the present invention, the gear ratio is such that the amount of change in the radius of the workpiece to be ground matches the amount of rotation of the feed motor, the full speed motor and the feed screw of the grindstone head. , it is possible to easily set a computer program regardless of the inclination angle of the cutting direction of the grindstone with respect to the center line of rotation of the object to be ground.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the schematic structure of a conventional angular type numerically controlled cylindrical grinder, Fig. 2 is a sectional view showing the drive mechanism of its grinding wheel head, and Fig. 3 is a plan view showing the schematic structure of a conventional angular type numerically controlled cylindrical grinder. It is a sectional view showing the drive mechanism, and the reference numerals in the figure are: 13 is the object to be ground, 14 is the rotation center line of the burr to be ground, 15 is the grindstone head, 16 is the grindstone, 28 is the feed motor, 30 is the feed screw, 32 Fi transmission, 33 is a drive gear, and 34 transmission gears. Patent applicant Mitsubishi Heavy Industries, Ltd. Sub-agent Patent attorney Shibe Mitsuishi (1 other person)

Claims (1)

[Claims] In an angular type numerically controlled cylindrical grinding machine in which the cutting direction of the grindstone is inclined by θ degrees with respect to the rotation center line of the workpiece that is rotatably supported, the grindstone is screwed into a grindstone head that supports the grindstone, and the rotation A feed screw that is inclined by θ degrees with respect to the center line and has a lead of L, and a cutting motor that drives this feed screw and has a unit rotation angle of β degrees, are connected to the radius of the object to be ground by the cutting indentation of the grindstone. An angular type numerically controlled cylindrical grinding machine characterized by connecting the amount of change via X.