JPS5843203B2 - Machine tool spindle unit clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an invention of a spindle unit clamping device for a machine tool that selectively connects a plurality of spindle units to a power unit so that a single machine tool can process a wide variety of workpieces. The purpose of this is to ensure accurate attachment of the spindle unit to the power unit by equalizing the tightness and surface pressure of the clamp contact surface, and to prevent the spindle unit from collapsing when the clamp cylinder is stopped. By preventing the front sagging phenomenon, it is possible to eliminate a decrease in spindle unit mounting accuracy caused by chips, dirt, etc. getting caught in the clamp surface.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a side view showing the state in which the spindle unit 3 is supported before clamping by two upper and lower spindle unit guide plates 2 protruding from the front surface of the power unit 1, and Figure 2 is a side view showing how the spindle unit 3 is supported by the spindle unit guide plates 2. FIG. 3 is a side view showing a state where the power unit 1 is clamped.

The power unit 1, as shown in FIGS. 3 and 4,
An input shaft 5 is rotatably installed horizontally in the center of the unit body 4,
The rear end of this input shaft 5 is connected to a motor 6 disposed on the upper surface of the unit main body 4 via a V-pulley 7, a belt 8, and a pulley 9, and the tip of the input shaft 5 is a spline shaft.
A claw clutch 10 fitted therein is engaged with a retaining ring 12 at the tip by a spring 11.

On the other hand, a cross-shaped plate spring 15 is fixed to the tip of a piston rod 14 in a diagonal arrangement to a clamp cylinder 13 that is fixed to the unit body 4 and loosely fitted to the human power shaft 5. At the same time, the rear ends of the slide bars 16 fitted into the front ends of the unit body 4 are attached parallel to the input shaft 5, respectively, and the spindle unit guide/clamp bars 17 are attached to the front ends of the upper two slide bars 16, and the lower two A spindle unit guide/clamp bar 18 is installed horizontally at the front end of the book slider 16, and a coil spring 20 is installed between the leaf spring 15 and the bearing part 19 that supports the upper two slide bars 16. This is through oppression.

As shown in FIG. 5, the spindle unit 3 has a bushing plate 23 attached to a guide bar 22 protruding forward from both sides of a unit body 21, and a drive shaft 24 rotatably installed horizontally in the center of the unit body 21. This drive shaft 24 has a claw clutch 25 integrally formed at its rear end portion to be fitted to the claw clutch 10 of the input shaft 5, and is connected to each spindle 26 via a power transmission mechanism (not shown). L-shaped protrusions 28 with grooves 27 facing inward are horizontally protruded at the upper and lower positions of the rear end surface of the unit body 21, respectively, and both grooves 27 are used to attach the spindle unit guide/clamp bar 17 and 18 of the power unit 1 to the side. I try to insert it from the opposite direction.

Next, the operation according to this embodiment will be explained.

As shown in FIG. 4, while the spindle unit 3 is in pressure contact with the power unit 4, pressurized oil is supplied to the rear liquid chamber 29 of the clamp cylinder 13 by a switching valve (not shown), and at the same time the front When the liquid chamber 30 is communicated with a tank (not shown) and the piston rod 14 is pushed forward, the spindle unit guide/clamp bar 17 and 18, which are connected to the piston rod 14 through the leaf spring 15 and the slide par 16, move forward and close the spindle. Release the clamp on unit 3.

When the piston rod 14 reaches the end of its stroke and the guide/clamp bar 17.18 stops, the guide/clamp bar 17.1
8, the spindle unit 3 is carried out to one side, and then a new spindle unit 3 from the other side is engaged with the guide/clamp bar 17.18 with its L-shaped protrusion 28, so that the drive shaft 24 is connected to the input shaft 5. Carry it in at position 1, which is on the same axis as .

When this button is pressed, pressurized oil is supplied to the front liquid chamber 30 of the clamp cylinder 13 by a switching valve (not shown), and at the same time, the rear liquid chamber 29 is communicated with a tank (not shown) to guide/clamp bar 17. 18 is retracted, the spindle unit 3 has its L-shaped protrusion 28 attached to the guide/clamp bar 17.
18 and the unit main body 4, it is firmly attached to the power unit 1.

At that time, slide par 16, guide/clamp bar 17.
18. Changes in the close contact of the clamp contact surface and uneven surface pressure due to manufacturing and assembly errors of the L-shaped protrusion 28, etc. are caused by the leaf spring 15.
Since it is corrected by the elastic deformation of , the contact displacement and surface pressure become substantially uniform.

Furthermore, if the switching valve (not shown) is switched to the neutral position and the clamp cylinder 13 is left in the inactive state, the clamping force will decrease due to oil leakage from the valve, etc., and the upper slide par 16 will be pulled out by the weight of the spindle unit 30. The spindle unit 3 is tilted forward and a gap is created on the clamping surface (spindle unit sagging phenomenon), but the upper slider unit 1
6 is elastically interposed with a coil spring 20 that overcomes the pulling force, so that the drooping phenomenon can be prevented and no gap is created on the clamping surface.

Therefore, there is no possibility of deterioration in spindle unit mounting accuracy caused by chips, dirt, etc. getting caught in the gap between the clamp surfaces while the cylinder is not in use.

When the spindle unit 3 is clamped to the power unit 1, the vertical and horizontal positions of the spindle unit 3 are secured by the positioning pins 31 protruding from both sides of the front side of the power unit 1, and at the same time, the claw clutches 10 and 25 are engaged. or the inclined top surface 32 of the pawl clutch 25 of the drive shaft 24 and the inclined top surface 33 of the pawl clutch 10 of the input shaft 5.
There are cases where the two shafts come into contact with each other, causing the pawl clutch 10 to move backward against the spring 11, and the two shafts do not fit together, but this problem is resolved when the input shaft 5 starts rotating.

That is, the pawl clutches 10 and 25 slide into each other on the inclined top surfaces due to the rotation of the input shaft 5, and the two shafts are connected.

As explained above, in the present invention, by connecting the slider to which the spindle unit guide/clamp bar is attached and the clamp cylinder via a single leaf spring, manufacturing and assembly errors of the clamp mechanism during clamping can be avoided. In addition, the elastic deformation of the plate springs corrects and equalizes the unevenness of the tightness and surface pressure of the clamping surface caused by the clamping, and the coil springs installed on the upper slide bar prevent the spindle unit from sagging when the clamp cylinder is at rest. Since this prevents chips, dirt, etc. from getting caught in the clamping surface, it is possible to always set the spindle unit correctly and firmly with respect to the power unit.

In addition, because the power unit's human power shaft and the spindle unit's drive shaft are removably connected by a claw clutch pressed by a spring, clamping is possible without any consideration of the engagement position between the input shaft and the drive shaft. This allows the spindle unit to be easily and quickly attached to and removed from the power unit.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a spindle unit positioned before being clamped on a power unit equipped with a spindle unit clamping device according to the present invention, and FIG. 2 is a side view showing a state in which the spindle unit is clamped to the power unit. 3 is a front view of a power unit equipped with a spindle unit clamp device according to the present invention, FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG.・River・Spindle unit information board, 3...Spindle unit,
4...Unit body, 5...Input shaft,
13... Clamp cylinder, 14...
Piston rod, 15...Plate spring, 16...
... Slide bar, 17, 18 ... Spindle unit guide/clamp bar, 19 ... Bearing section, 20 ... Coil spring, 21 ... Unit Main body, 24... Drive shaft, 26...
・Spindle, 28...L-shaped protrusion, 31・
····Positioning pin.

Claims (1)

[Claims] 1. In a machine tool in which multiple spindle units are selectively attached to the power unit, multiple sliders each having a spindle unit guide/clamp bar attached to the tip are inserted into the upper and lower parts of the front of the power unit body. , the rear ends of these sliders are connected to a leaf spring attached to the piston rod of one clamp cylinder located in the center of the power unit body,
A spindle unit clamping device for a machine tool, characterized in that a spring is interposed between the spring and a bearing section that supports the upper slide bar to prevent the spindle unit from sagging forward.