JPS62140763A - Jig grinding machine - Google Patents

Abstract

PURPOSE:To secure the positional precision of vertical movement and the feeding speed of a quill by arranging a holding means capable of holding the quill which slides in the axial direction rotatably with its position fixed in the axial direction and numerically controlling the moving distance and the speed of an actuator which can feed a piston connected to the holding means in the axial direction. CONSTITUTION:An upper quill 11 is held slide-freely in the axial direction by a sleeve 13 and the rotation of the sleeve 13 is transmitted to the quill 11. The quill 11 is held rotatably with its position fixed in the axial direction by a holding means 16. Furthermore, the piston of a hydraulic stepping cylinder 22 having a pulse motor 21 is connected to the holding means 16 such that the rotation per one pulse can be converted into the stepping feed of the piston and feeding force can be amplified. The numerical control permits to rotate the pulse motor 21 in the optional rotating direction by the optical rotational angle, to enable the optional stepping feed of the piston to be carried out to feed a lower quill 5 vertically by the required distance together with its free vertical movement, rate, therefore exact control is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a jig grinding machine, and particularly to a mechanism for controlling the feed of a quill that holds a grinding head and moves up and down in conjunction with the reciprocation.

[Prior Art] Conventionally, the quill of a jig grinding machine is driven by a hydraulic cylinder, and the amount of movement thereof is determined by detecting the position using a limit switch or the like and operating a directional control valve that switches the operating direction of the hydraulic cylinder. , and its speed has been controlled by adjusting the flow rate using a hydraulic flow rate adjustment valve.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, the positional accuracy of the two bottom dead centers of the vertical and reciprocating interlocking is poor, and the accuracy of the bottom dead center is poor especially when grinding bottomed holes. There were problems such as the necessity of providing a large gap between the bottom surface and the bottom surface, and the fact that speed control was not accurate, making it difficult to maintain constant cutting conditions.

An eleventh object of the present invention is to provide a jig grinding machine that can eliminate the problems of the conventional techniques described above.

[Means for solving the problem] The problem with the above-mentioned conventional technology is that the main shaft is supported by the main shaft head body and rotates under power drive, and the main shaft is inserted into the inner hole of the main shaft.
A quill that slides in the central axis direction, a quill holding means that holds the quill rotatably and in a fixed position in the axial direction, and a piston connected to the quill holding stage F, the -Lll: It is fixed to the l+ head main body and the piston is sent in the direction of the main shaft center +I+M or +1(
This problem can be solved by constructing an actuator that can move the actuator and a stage that numerically controls the movement of the actuator and its speed.

[Example] Hereinafter, an uninvented example will be described with reference to FIG. A T-shaft 3 is connected to the L-shaft head body 1 via a set of angular ball bearings 2.
is rotatably supported. An intermediate sleeve 4 is provided in the inner hole of the main shaft 3, and a lower quill 5 is slidably inserted into the intermediate sleeve 4 in the axial direction.

-F section A double tail guide path 5a is provided at the end of the quill 5, and a grinding member 6 that is slidable and guided by the double tail guide path 5a is attached. In the grinding device 6, it is generally possible to rotate the grinding wheel 7 at high speed using a high-speed high-frequency motor.

The end of the quill 5 is connected to the end through the join hlO.
quill 11. Northern Quill 11 is 1.
It is supported in the axial direction by a sleeve 13 which is supported by a first F bearing 12 provided on the upper part of the E shaft head main body l. A boot 914 is fixed to the sleeve 13, and is rotated by a belt by a motor (not shown), and this rotation is transmitted to the two-part quill 11 by a key 15 provided on the sleeve 13. +iii The upper quill 11 is rotatably held by the quill holding stage 16 while being fixed in position in the axial direction.

The tip of a piston 20a of a pneumatic cylinder 20, which is fixed to the L shaft head main body l, is connected to the quill holding means 16, and the pneumatic cylinder 20 is connected to its belt via a counterbalance valve (not shown). Compressed air is constantly stored on the side to prevent the quill 5.11 from falling downward. A piston 22a of a well-known hydraulic suction cylinder 22 equipped with a pulse motor 21 is connected to the quill holding means 16, and the rotation of each pulse of the pulse motor 21 is converted into step feed of the piston 22a. It is possible to increase the feed force using hydraulic pressure. rii
The pulse motor 21 (j) can be rotated by an arbitrary rotational angle in an arbitrary rotational direction by a number (not shown) (+/i control r), and thereby the hydraulic stepping cylinder 22
It is possible to apply an arbitrary step feed to the piston 22a.

Next, the operation of the jig grinding machine having such a configuration will be explained. When the 1-1 section quill 11 rotated by the boot 914 transfers rotation to the lower quill 5 via the joint 10, the double till guide path The grinding wheel T7, which is supported by the grinding device 6 which is offset from the center axis of rotation of the dome quill 5 by 5a, is driven by a high frequency motor and rotates on its own axis. It begins to revolve around the central axis.

As a result, the inside of the hole added to the V-plate workpiece is
At this time, when a pulse of W is applied to the pulse motor 21, the hydraulic stepping cylinder 22 is operated, and the piston 22a, 11μ, part quill 11, and part quill 5 are ground. Must be 1-downward, ,
l, sending the knee is 11-chono. For example, when grinding the inner wall of a hole with a bottom 4 (=J) using a 9J cycle as shown in FIG. It is Kaka. Further, by controlling the number of pulses applied to the pulse motor 21 per pulse time, the speed of vertical movement of the lower quill 5 can be freely determined, and optimum grinding conditions can be easily obtained.

Note that a DC motor, a pulse motor, or the like may be used instead of the hydraulic stepping cylinder 22.

[Effects of the Invention] As is clear from the explanation in 1- below, according to the present invention, a jig grinding machine can be obtained in which the quill 1-lower interlocking can be controlled more accurately than ever in terms of position accuracy and feed rate.

[Brief explanation of drawings]

FIG. 1 is a central sectional view showing an embodiment of the spindle head of a jig grinding machine according to the present invention, and FIG. 1.-L shaft head main body, 3.L two shafts, 5: Do part quill, 11. 1 part quill. 16.Quill holding stage, 21.Pulse motor, 22.Bulding pressure step pink cylinder, 22a.Piston a0, ---- Fig. 1 Fig. 2

Claims (1)

[Claims] A main shaft supported by the main shaft head body and rotated by power drive, a quill fitted into the inner hole of the main shaft and sliding in the direction of the central axis, and a quill that is rotatable but fixed in position in the axial direction. a quill holding means for holding the quill, an actuator having a piston connected to the quill holding means, fixed to the spindle head body and capable of feeding the piston in the direction of the center axis of the spindle; and a movement amount of the actuator. A jig grinding machine characterized by having a means for numerically controlling speed.