JPH0645084B2 - 4-position position selection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a machine tool for a workpiece on which a plurality of various working devices of various devices are fixedly fixed on a moving side substrate. The present invention relates to a position selection mechanism that can be alternately moved to four positions of a processing position and a non-processing standby position.

"Prior Art" A machine tool may be equipped with a plurality of various working members such as cutting blades, which may be alternately acted on a workpiece to perform desired cutting.

For example, the following is applied to the headstock moving type automatic lathe, which will be described with reference to FIGS. 5 to 7.

FIG. 5 shows a side view of a numerically controlled automatic lathe.

A long rod-shaped work 1 of several meters penetrates from the back of the headstock 2 and is firmly grasped by the chuck 3 of the main spindle, and the work tip is mounted on the bed 4 with high rigidity on the bush base. The frame 5 is also penetrated.

Then, the headstock 2 is linearly fed by the numerically controlled drive mechanism system of the servomotor 6, and at the same time, the tool rests 7A to 7E radially arranged around the work 1 on the front surface of the bush base frame 5 and the tool attached thereto. The 8A to 8E are also configured to feed the work 1 in a consistent and highly efficient manner by feeding it in sequence by the drive mechanism system of the numerically controlled servo motors 9, 9.

A more detailed view of the front surface of the bush base is as shown in FIG.

In the figure, the work 1 is centered radially, and the left and right 2
In the set, a total of five turrets 7A to 7E are installed at positions facing each other, and the two turrets 9 and 9 drive the turrets 7A to 7E.

Using the tool holders 10 ... Attached to the turrets 7A-7E, the required types of knives 8A-8E are accurately centered and attached.

The structure of the relation between the bush base frame 5 and the tool rests 7A to 7E is clearly shown in Fig. 7. As shown in the drawing, the work 1 is pierced and held in the central portion of the bush base frame 5, and the work 1 at the time of cutting is cut. A guide bush 11 is attached so as not to cause rotational shake.

Although details of the drive mechanism are omitted, the output of the servomotor 9 is transmitted to the feed screw shaft 12, and is fixed to the parent nut 13 that constitutes the ball screw pair and the slider 14 that is slidable with high accuracy in the axial direction. The large diameter pin protruding from the slider 14.
An L-shaped block 18 in which 15 or 16 are fixed to the bottom surfaces of the tool rests 7A and 7D, which are arranged in a pair so as to face each other.
Of the two turrets 7A, 7D or 7B by making contact with the back of the
It is configured to send 7E individually.

Reference numeral 19 in FIG. 3 denotes a coil spring in a compressed state for back-moving the tool rest.

In the above example, all of the plurality of working members are always located on the working line, and the working work can be carried out as they progress, but each must be equipped with an advancing / retreating mechanism.

On the other hand, the processing members are arranged in rows so that the mounting base itself of the equipment can be brought into and out of contact with the work material by the advancing and retracting mechanism,
If the processing member can be moved alternately to four positions of the processing position and the non-processing standby position on the mounting base, a single advancing / retracting mechanism for moving the processing and non-processing positions can be used. Space will be reduced in the width.

Conventionally, a combination of a ball screw, a trapezoidal screw, a servo motor, and a pulse motor is generally used as a mechanism for slidingly moving the processing members arranged in a row and selecting the position among four positions.

"Problems to be solved by the invention" However, in the above positioning mechanism, fine adjustment control is possible, but the control device becomes complicated and expensive, and the space occupied by the mechanism device also becomes large. I will end up.

Furthermore, it has the drawback that it is impossible to set the selection time to reach a predetermined position in the middle of the screw early, and it is weak in the holding force for receiving the reaction force of the cutting action at the predetermined position, which makes it difficult to achieve machining accuracy. .

"Means for Solving Problems", "Action" The present invention has been made in view of the above circumstances, and its gist is to provide a slider as a mounting base for a working member such as a cutting blade, and the slider. One of the two piston rods equipped in the twin-barrel cylinder block, which is configured separately for both slide bases as the slide guide base, is fixed to the slide base side, and the cylinder block is stroked with respect to the slide base. 2 of the piston rod is fixed to the slider side so that the slider can be moved to the limit position corresponding to the stroke of the piston rod with respect to the cylinder block, and the slider is finally used as a slide base. On the other hand, it is possible to move to four different positions, which is called positioning of the cylinder at the extreme position. The point is to provide a new four-position positioning mechanism that has the most excellent function in terms of speed of position selection and stability when holding a position by receiving a reaction force.

[Example] Hereinafter, this will be described in detail with reference to the drawings. The drawings show the case where the present invention is applied to the automatic lathe described above, and FIGS. 1A to 1D show a front view, a left side view, and a right side view of the mechanism of the present invention with the slider attached to the cover removed. FIG. 2 is a plan view of the mechanism of the present invention when it is in a 4-position position, and FIG. 3 is a plan view of a slider mounting with a working member. is there.

In the figure, reference numeral 21 denotes a twin cylinder cylinder block having cylinders 21a and 21b, which is assembled in a manner to cover the slide table 22 and the groove 22a in a housing groove 22a formed in the slide table 22. The sliders 23 are arranged as follows in a non-contact separated state.

Cylinders 21a and 21b have pistons 24 and 25 and cylinder lids 26, 26 ', 27 and 27', respectively, and the cylinder volumes must be designed to be the same in order to synchronize the strokes, although the strokes may differ. I won't.

The cylinder lid 26 holding the piston 24 is held by an oiling sleeve 28 fixed to the slide base 22, and the opposite cylinder lid 26 'is held by an oiling sleeve 29 fixed to the slide base 22.

A position adjusting screw 30 is formed on one end of the piston 24, and is fixed to a bracket 31 fixed to the slider 23.

Then, the piston 24 and the slider 23 are integrated.

On the other hand, the other end of the piston 24 abuts on a position adjusting screw 32 provided at the tip of the cylinder lid 26 '.

One end of the piston 25 is fixed to the slide base 22 by a cylinder positioning collar 33 and a cylinder fixing nut 34.

Then, the piston 25 and the slide base 22 are integrated.

On the other hand, the other end of the piston 25 is held by a hollow position adjusting screw 35 screwed to the slide base 22.

Then, the cylinder block 21, which is in a separated relationship with both the slide base 22 and the slider 23 and is in a floating state in the concave groove 22a, is reciprocally moved by the stroke by the operation of the piston 25.

Along with this, the cylinder lid 26 slides in the refueling sleeve 28 and the cylinder lid 26 'slides in the refueling sleeve 29 along with the cylinder block 21 by the same stroke.

Due to the combination of the extreme positions and postures of the pistons 24 and 25 with the above configuration, the slider 23 is placed in the 4-position position as shown in FIGS.

In the above figure, the oil passages A to D (filled in and shown) connected to both ends of the cylinders 21a and 21b are refueled without using a normal means for connecting flexible hoses to both ends of the cylinder block 21. It is said that the pair members, such as the sleeve, the cylinder lid, and the piston rod, are engraved in a pair member that composes the mechanism of the present invention with a design that can cope with relative displacement. As a result, the decrease in operating accuracy due to the difference in expansion is eliminated.

Further, since the cylinder block 21, which is the largest heat generating element, is in a floating state in the concave groove 22a in a manner separated from the slide base 22 and the slider 23 as described above, there is no heat transfer due to the presence of the heat insulating space. Inconvenience due to heat transfer expansion is avoided, which is preferable.

FIG. 3 shows a mode in which the slider 23 equipped with the cutting blades 36a to 36e is attached to the lifting mechanism.

In the figure, an arrow 37 indicates the moving direction of the slide base 22, and an arrow 38 indicates the moving direction of the slider 23.

Incidentally, 39 and 39 'in FIG. 1 are forward / backward guide liners of the slide base 22.

Next, each position of FIGS. 2A to 2D will be described in detail. That is, i) In position [1], oil is supplied to the oil passages A and D, and the position is adjusted by the position adjusting screw 40 attached to the bracket 31 so as to abut against the oil supply sleeve 28.

ii) At the position [2], oil is supplied to the oil passages A and C, and the position is adjusted by the position adjusting screw 32.

iii) At the position [3], oil is supplied to the oil passages B and D, and the position is adjusted by the position adjusting screw 35.

iv) At the position [4], oil is supplied to the oil passages B and C, and the position is adjusted by the position adjusting screw 30.

Thus, the position of each position can be adjusted, and the position can be selected quickly by easily and stably selecting the position from any position by switching the oil passage to the extreme position at the same speed.

Further, in the vicinity of the limit, there is an advantage that the escape path of the oil becomes a bottleneck and the resistance increases, and the automatic braking action does not cause an impact.

FIG. 4a is shown in a simplified form in FIG. In the figure, the stroke of the piston 24 is set to be twice the stroke β of the piston 25, and four positions of equal pitch shown in FIG.

If the stroke of the piston 24 is set to, for example, α (≠ 2β,> β), it is possible to widen between the positions [2] and [3] as shown in FIG.

[Advantages of the Invention] As described above, according to the present invention, it is possible to select the positions of the processing members arranged in rows in four positions quickly at the same speed and under stable conditions during processing.

[Brief description of drawings]

1A to 1D are a front view, a left side view, and a right side view of a mechanism of the present invention, in which a slider which is mounted in a lid mode is removed and viewed.
2A to 2D are views of the mechanism of the present invention when in a 4-position position, and FIG. 3 is a view of mounting the slider equipped with a machining member. 2 is a simplified view of FIG. 2, FIG. 5 is a side view of the automatic lathe as a whole, FIGS. 6 and 7 are front views of a bush base showing conventional means in the automatic lathe, and arrows III to III in FIG. FIG. 21 …… Cylinder block, 21a, 21b …… Cylinder,
22 …… Slide base, 22a …… Concave groove, 23 …… Slider, 24
...... Piston, 25 ...... Piston, 26,26 '…… Cylinder lid, 27,27' …… Cylinder lid, 28 …… Lubrication sleeve, 29 …… Lubrication sleeve, 30 …… Position adjustment screw, 31 ……
Bracket, 32 …… Position adjusting screw, 33 …… Cylinder positioning collar, 34 …… Cylinder fixing nut, 35 …… Position adjusting screw, 36a ～ e …… Cutting blade, 37 …… Arrow, 38 ……
Arrows, 39, 39 '…… Advancing / retreating guide liner, 40 …… Position adjusting screw.

Claims (2)

[Claims] 1. A slider as a mounting base for a working member such as a cutting blade, and a slide base as a slide guide base for the slider, and one of two piston rods mounted on a twin cylinder block of a separated structure. The slider is fixed to the cylinder block by fixing it to the slide base so that the cylinder block can be moved to the two extreme positions corresponding to the stroke of the piston rod with respect to the slide base and the other piston rod is fixed to the slider side. A four-position position selecting mechanism characterized in that the slider can be moved to an extreme position corresponding to the stroke of the piston rod, and finally the slider can be moved to four different positions with respect to the slide base. 2. A patent in which an oil passage communicating with both ends of each cylinder of a twin cylinder block is engraved in a mechanism constituent member of each oil supply sleeve, a cylinder lid, and a piston rod by a design capable of coping with relative displacement. The 4-position position selection mechanism according to claim 1.