JPS62130172A - Nc grinding machine - Google Patents

Abstract

PURPOSE:To increase an amount of grinding at one time by disposing in parallel the edge faces of two cup wheel grindstones respectively set to stands movable in parallel to each other and shifting them in the direction crossing at a right angle to the axis of a work so far as amounts of the effective radiuses of the cup wheel grindstones. CONSTITUTION:Two grindstone stands are set and each of them is supported in parallel to each other movably by cutting adjusting mechanisms 11, 12 (NC motor) installed independently from each other. Two cup wheels 15, 16 set respectively to the grindstone stands are disposed in such a manner that each edge face of the cup wheels is parallel to the other and the cup wheels 15, 16 deviate in the up-and-down direction respectively so far as respective amounts of the radiuses r1, r2 in the crossing direction to on diametrical line l2 drawed from the axial line l1 of a work W. As a result, when grinding a flat surface, the edge faces of the cup wheel 15, 16 are trued up cut surface. Since the ground flat surface become wide due to the above process, the board flat surface can be ground at one feed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an NC grinding machine using a cup wheel grindstone.

[Prior art] In the conventional grinding machine of this type,
There are those shown in Japanese Patent Application No. 00 and Japanese Patent Application Laid-Open No. 60-34256. The former one has 1 cup wheel grindstone.
The workpiece is ground by being positioned below the workpiece axis by its effective radius. In the latter type, two cup wheel grindstones are arranged horizontally along the workpiece axis, and both are positioned below the workpiece axis by their effective radius to grind the workpiece. .

[Problems to be Solved by the Invention] By the way, when grinding a part of the peripheral surface of the workpiece into a flat surface using the grinding machine with the above configuration, the rotation axis of the cup wheel grindstone must be raised to the psychological axis before grinding. Therefore, the grinding machine is equipped with a drive device to move the cup wheel grindstone up and down. In this case, especially when the width of the plane to be ground is wide, the grindstone must be moved a large distance, and a moving mechanism with a long stroke is provided.

For this reason, the rigidity of the grindstone supporting portion is low due to the extra provision of a moving mechanism, etc., and therefore, the grinding resistance cannot be increased very much, and this is also a cause of vibration. in addition,
When such surface grinding is performed, the surface to be ground is relatively narrow, which causes work efficiency to deteriorate.

[Means for solving the problems] The present invention solves the above problems, and includes a main spindle and a tailstock spindle for rotating or angularly indexing a workpiece, and a spindle supported between these spindles and six push spindles. A grindstone head provided to be located on the circumferential side of the workpiece; a cup wheel grindstone set on the grindstone head with its end face facing the circumferential surface of the workpiece; In the NC grinding machine, the NC grinding machine is equipped with a feed mechanism that relatively moves along the direction, and a depth of cut adjustment mechanism that moves the grindstone head in a direction perpendicular to the axis of the workpiece. The stands are supported movably in parallel to each other by independently provided cutting adjustment mechanisms, and two cup wheel grindstones each set on these grindstone stands are
The end faces of the cup wheels are parallel to each other, and the cup wheels are arranged so as to be shifted to one side and the other by the effective radius in a direction perpendicular to a radial line drawn from the axis of the workpiece.

[Function] By shifting the depth of cut of each cup wheel grindstone set on two grindstone heads, it is possible to perform two stages of grinding, for example, rough grinding and finish grinding, with a feed of - times, and when performing surface grinding. The surface grinding surface becomes wider by aligning the end faces of each cup wheel grinding wheel and making a cut, so a large width surface can be ground with one feed.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

1 and 2 are a side view and a top view of the NC grinding machine of this embodiment. This grinding machine, like a commonly used grinding machine, has a table 2 on a base 1 that moves in the left-right direction in the figure, and a headstock 3 and a tailstock 4 on the top surface of the table 2, which are arranged in a straight line. The headstock 3 is provided with a spindle center 5, and the tailstock 4 is provided with a 6-press center 6 in correspondence with each other.
The workpiece W, which is the object to be ground, is supported between the two.

Also, at one end of the base I, move the table 2 back and forth.
A C motor 7 is provided at one end of the headstock 3, and an NC motor 8 for giving rotation to the workpiece W. By driving this NC motor 8 to rotate, the workpiece W can be rotated and the angle can be determined. It looks like this.

On the side of the table 2, supported by the base 1, first and second grindstone heads 9.10 are provided so as to be movable in a direction perpendicular to the psychological axis Q as shown by the arrows (() and (CI)). ing.

The movement of these grindstone heads 9 and 10 is controlled by an NC installed at the rear.
This is done independently by motors 11 and 12.

First and second grindstone heads 9, spindle receiver 1 for IO
3.14 is fixed. These spindle receivers 13
．． 14, a spindle 17.18 has first and second cup wheel grinding wheels 15.16 whose end surfaces are parallel to each other, and whose tips protrude in the direction of the table 2, with respect to the Shinshin axis Q1. They are mounted perpendicular to each other.

The installation and position of these spindles 17 and 18 will be described with reference to FIGS. 3 and 4. Figure 3 shows both grindstones viewed from the front, Figure 4 shows them viewed from the side.
al is the psychological axis, and a is the psychological axis Q.

Shows the radius line drawn horizontally from . As shown in these drawings, the spindle 17 of the first grinding wheel head 9 is located an effective radius r below the first cup wheel grinding wheel 15 in a direction perpendicular to the radius line e, and Second whetstone head
The spindle 18 of O has an effective radius r2 above the cup wheel grinding wheel 16 in a direction perpendicular to the same diameter line Q2.
They are placed offset from each other.

These spindles 7.18 are connected to motors 19.18 provided behind the respective spindle receivers 13.14.
20 can be rotated via transmission belts 21, 22.

The spindle receiver 13.14 is provided with a vibration sensor (not shown) that detects vibrations of the spindle 17.18 when grinding a workpiece. Further, regarding the motors 19 and 20, a current sensor (not shown) is provided to detect a load current generated in these motors 19 and 20 during grinding of the workpiece W. This grinding machine is controlled by these vibration sensors and current sensors as follows.

(a) Normal grinding when the vibration sensor is below the set value and within the current sensor set value range.

(b) If the vibration sensor and current sensor exceed the set values, that is, the grinding surface of the workpiece W is rough and the grinding resistance is large, but in this case, the movement of the table 2 is decelerated.

(C) When only the vibration sensor exceeds the set value, the table 2 stops.

(d) When the vibration sensor and current sensor are below the set values, that is, when the workpiece W is not being ground and the cup wheel grindstones 16 and 17 are in an idling state, the table 2 moves at high speed.

With the NC grinding machine of this embodiment having the above configuration,
The grinding process will be described assuming that a grinding program for forming a flat surface on a part of the circumferential surface after grinding the circumferential surface of the workpiece W into a cylindrical surface is input.

(1) The workpiece W is rotated by the NC motor 8, and
A spindle 17.18 is rotated by an NC motor 19.20 and rotates the first and second cup wheel grinding wheels 15.1.
6 rotates.

(2) The first grindstone head 9 moves forward by the NC motor 11, and the first cup wheel grindstone 15 cuts into the workpiece W at a grinding position.

(3) The second grindstone head 10 is moved forward by the NC motor 12, and the second cup wheel grindstone 16 cuts into a position further curved than the cutting position of the first cup wheel grindstone 16.

(4) The table 2 is moved to the left in the figure by the NC motor 7, and the peripheral wall of the workpiece W is ground. At this time, the first
A first stage of grinding is performed by the second cup wheel grindstone 15, and then a second stage of grinding is performed by the second cup wheel grindstone 16.

(5) When the workpiece W has been ground by the second cup wheel grindstone 16, the second grindstone head 1o is
The second cup wheel grindstone 16 cuts into the workpiece W at a grinding position.

(6) The first grindstone head 9 is moved forward by the NC motor 11, and the first cup wheel grindstone 15 cuts into a position advanced from the cutting position of the second cup wheel grindstone 16.

(7) The table 2 is moved to the right in the figure by the NC motor 7, and the peripheral wall of the workpiece W is ground. At this time, the second
A third stage of grinding is performed by the first cup wheel grindstone 16, and then a fourth stage of grinding is performed by the first cup wheel grindstone 15.

The above steps (1) to (7) are repeated to grind the workpiece W to a required finished diameter and complete the cylindrical grinding.

Next, in order to form a flat surface on a part of the circumferential surface of the workpiece W, (8) the NC motor 8 is stopped and the workpiece W is fixed;
In addition, the first and second grindstone heads 9 and io move forward to the first grindstone.
The second cup wheel grindstone 15, 16 cuts into the workpiece W at a grinding position with its end surfaces aligned.

(9) The table 2 is moved by the NC motor 7 and the workpiece W is fed in the direction of the first and second cup wheel grindstones 15 and 16, so that a part of the circumferential surface of the workpiece W is removed from the first stage. Be ground to a flat surface.

(10) After the first stage surface grinding is completed, the first and second
The grinding wheel head 9.10 moves forward and cuts to the second stage grinding position while keeping the end surfaces of the first and second cup wheel grinding wheels 15.16 aligned.

(11) By moving the table 2 and sending the workpiece W toward the first and second cup wheel grindstones 15 and 16, a part of the surface of the workpiece W is ground to a second-stage plane.

The above steps (9) to (11) are repeated until the required plane is formed.

In this way, the workpiece W is ground into a desired shape through the steps (1) to (b) above. At this time, when grinding the workpiece W into a cylindrical shape, by shifting the depth of cut of the first and second cup wheel grindstones 15 and 16, two stages of grinding can be performed with one feed of the table 2, and a flat When grinding, the first and second cup wheel grindstones 15.
By making the cuts with the end faces of 16 aligned, the plane ground surface becomes wider, which improves work efficiency. Further, by providing the vibration sensor and the current sensor, excessive grinding resistance is not generated on the workpiece W, so there is an advantage that even a workpiece made of a relatively brittle material can be reliably ground.

[Effects of the Invention] As explained above, the NC grinding machine of the present invention does not require a mechanism for moving the cup wheel grindstone up and down, compared to the conventional grinding machine. Therefore, since such a vertical movement mechanism is not involved, the support of the grinding wheel becomes more solid, increasing structural rigidity, and therefore grinding can be performed even when the grinding resistance is large.
As a result, the amount of grinding can be increased, and the device can be downsized. Furthermore, when surface grinding is performed, since the surface grinding width is widened, it is possible to grind an area twice as much as usual with -times of feeding, and therefore the working time is significantly shortened.

[Brief explanation of drawings]

1 and 4 show one embodiment of the present invention, in which FIG. 1 is a schematic side view thereof, FIG. 2 is a schematic top view thereof, and FIGS. 3 and 4 are cup wheel grinding wheels. It is a figure explaining arrangement of. 5... Spindle center (spindle), 6...0
Push center (tailstock shaft), 7...NC motor (feed mechanism), 9...first grindstone head, 10...
・Second whetstone head, 11.12...NC motor (
(cutting depth adjustment mechanism), 15.16... Cup wheel grindstone, W... Workpiece, el... Psychological axis, e. ...Radius, rl, r2...Effective radius. Mitsubishi Metals Co., Ltd. Figure 4

Claims (1)

[Claims] A main spindle and a tailstock shaft that support the workpiece for rotation or angular indexing, a grindstone head provided to be located on the circumferential side of the workpiece supported between the main spindle and the tailstock spindle, and an end surface of the workpiece. a cup wheel grindstone set on the grinding wheel head toward the circumferential surface; a feeding mechanism for relatively moving the grinding wheel head and the workpiece along the axial direction of the workpiece; In an NC grinding machine equipped with a depth of cut adjustment mechanism that moves in the direction,
Two of the above-mentioned grindstone heads are provided, and each grindstone head is supported so as to be movable in parallel with each other by independently provided cutting adjustment mechanisms, and two cup wheel whetstones set on each of these grindstone heads are supported. are arranged such that their end surfaces are parallel to each other, and that the cup wheels are shifted to one side and the other by the effective radius of the cup wheel in a direction perpendicular to a radial line drawn from the axis of the workpiece. Characteristic NC grinding machine.