JPH0653324B2 - Position selection mechanism for moving headstock type automatic lathe - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a position selection mechanism capable of simultaneously performing front face boring and outer diameter cutting in a headstock moving automatic lathe.

"Prior art" A headstock moving type automatic lathe, which is one of the automatic lathes for bar processing, slides on a bed to chuck and rotate the bar and a linear movement in the axial direction. A moving headstock, a tool rest that is given a moving action in a direction orthogonal to the sliding direction of this headstock, various tools such as a bite and a drill that are attached to this tool rest and cut the above bar material, and a rod. The main structure is constituted by a guide bush that supports the material in the vicinity of the processing position and prevents flexural deformation of the work material due to cutting.

That is, the bar material chucked by the spindle and given the rotational motion is fed in the axial direction by sliding of the spindle stock, and is cut by a predetermined knife attached to the toolstock.

Therefore, since the guide bush is used, it has high rigidity against cutting force and is suitable for precision machining of long and slender parts.In addition, various attachments can be used for secondary machining such as horizontal drilling, key groove machining, and back machining. It is characterized by using a single lathe.

An example thereof will be described with reference to FIGS. 2 to 4.

FIG. 2 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 front view 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 so as to face each other, and are driven by two servo motors 9, 9.

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

The relational structure between the bush base frame 5 and the tool rests 7A to 7E is clearly shown in FIG. 4, and 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 during 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 in the axial direction with high precision. Then, the large-diameter pin 15 or 16 protruding from the slider 14 is brought into contact with the back of the L-shaped block 18 fixed to the bottom surfaces of the tool rests 7A to 7D, which are in a pair and are opposed to each other, Utilizing two types of rotations of the servo motor 9 in the forward and reverse directions, two turrets 7A, 7D or
It is configured to send 7B and 7E individually.

Reference numeral 19 in FIG. 4 is 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 performed if the working members proceed.

As described above, generally, in the headstock moving type automatic lathe, the vicinity of the cutting portion of the bar which is rotated at high speed by the main shaft is rotatably supported by the guide bush to prevent the bar from being deformed and processed. Has been done.

In the above-mentioned FIG. 2 to FIG. 4, all of the plurality of working members (cutting tools) are located on the pre-working work line and indexing is not necessary. While each piece must be equipped with an advancing and retracting mechanism, the processing members are arranged in rows so that the mounting base of the equipment itself can be brought into and out of contact with the work piece by the advancing and retracting mechanism, If it is possible to alternate between 4 positions of machining position and non-machining standby position on the mounting base, machining,
Since a single advancing / retreating mechanism for moving the non-machining position is sufficient, and the space can be greatly reduced, the applicant proposes a new mechanism in Japanese Patent Application No. 62-117700. .

The gist of this is that one of the two piston rods installed in the twin-barrel cylinder block that is separated from both the slider as the mounting base of the machining action member such as the cutting blade and the slide base as the slide guide base of the slider. Is fixed to the slide base so that the cylinder block can be moved to 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 to set the slider to the cylinder block. On the other hand, it is possible to move the slider to the limit position corresponding to the stroke of the piston rod, and eventually to move the slider to four different positions with respect to the slide base.

Hereinafter, this will be described in detail with reference to FIGS.

5a to 5d are a front view, a left side view, and a right side view of the mechanism in which the slider is attached in a manner of covering and the slider is removed.
6A to 6D are views of the lifting mechanism at the 4-position position, and FIG. 7 is a view of a slider mounting mode equipped with a processing member.

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 make them operate synchronously although their 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 this 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.

The cylinder block 21, which is in a floating state in the groove 22a due to the separation relationship between the slide base 22 and the slider 23, is reciprocated by the stroke of the piston 25 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 orientations of the pistons 24, 25 with the above configuration, the slider 23 as shown in FIGS.
Will be placed in 4 position.

In the above figure, the oil passages A to D (shown in black) connected to both ends of the cylinders 21a and 21b are refueled without using the usual means of 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 this mechanism with a design that can cope with relative displacement. By this, each pair member is set to the same temperature. 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 heating 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, the heat insulating space is not present and heat is not transferred. This is preferable because the inconvenience due to heat transfer expansion is avoided.

FIG. 7 shows a mode in which the slider 23 having 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.

In FIG. 5, 39 and 39 'are guide liners for the slide base 22.

Next, the positions shown in FIGS. 6A to 6D will be described in detail. That is, i) At position [1], the oil passages A and D are filled with oil, and the position is adjusted by the position adjusting screw 40 which is brought into a position in which the bracket 31 abuts on 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, the escape path of the oil becomes an overflow path to increase the resistance, and there is an advantage that the automatic braking action does not cause an impact.

A simplified illustration of FIG. 6 is as shown in FIG. 8a. 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.

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

9 (a) and 9 (b) show a mode in which the forward / backward guide liners 39, 39 'are inclined with respect to the bush base frame.

According to this, since the slide base 22 is always given a self-weighting down-biasing force, the slide base 22 can move in the same direction smoothly and with a small driving force.

43 in the figure is a servo motor for driving the slide base 22 forward and backward,
Reference numeral 44 denotes a lead screw / nut mechanism using a ball screw and a nut mounted on the servo motor 43, and 45 denotes a brake device for self-weighted down-sliding that is preferably added to the lead screw / nut mechanism 44.

With the above configuration, the cutting blades 36a to 36e are positioned at four positions, and the slide base 22 is moved to perform the outer diameter cutting process on the work material.

Incidentally, 36e, which is located on the opposite side to 36a, joins under the positioning of 36a.

That is, a total of 5 cutting blades can be operated.

Now, in an automatic lathe, in addition to the above-mentioned outer diameter cutting processing, it is necessary to perform front hole drilling for the processing material.Furthermore, the processing material is held stationary on the bush and rotated from the right angle direction. It is also necessary to drill.

Conventionally, in order to satisfy such machining, the means for arranging the turret on the side of the spindle line is equipped on a limited radial line under the same scale as the cutting blade, and for front face drilling An independent moving table was arranged on the extension of the spindle line (indicated by M in FIG. 2), and a front hole drilling drill N was attached to this.

However, the above means is not preferable because the turret becomes extremely complicated, and the means for disposing an independent moving stand complicates the tool stand and enlarges the apparatus.

Therefore, the present applicant has a four-position position selection mechanism that is used by being assembled to the above guide bush frame, and includes three cross spindles that are attached with a rotary drive source and that are drilled from the right angle direction in parallel. Of the cross spindle, a pinion shaft engaged with a hydraulically driven confronting rack is erected above the center line of the central one of the cross spindles, and the pinion shaft has the same spacing as the above three cross spindles. The cross body where three front spindles that are subjected to front hole drilling in the coordinated state are assembled to the arm tips and the front arms are integrally connected and the drill mechanism is provided in two layers The spindle has a drilling function in the right angle direction and a front surface as it is mounted by screwing on the slider in a configuration facing the three cutting tools fixed on the slider. Japanese Patent Application No. 62-240351 proposes a cross machining unit that can be equipped with a dawn machining mechanism compactly on a slider to make more effective use of the four-position position selection mechanism and further improve convenience. .

The unit is mounted in FIG. 9A, and details thereof are shown in FIGS. 10A to 10D. Fig. 10 a-d
Is a vertical cross-sectional view of the unit when the front spindle is operating, a view in the direction a in FIG.
It is a d-d arrow line view in a figure.

In the figure, 100 is the cutting blade 36b on the slider 23 ~
A cross body which is positioned on the opposite side of 36d by positioning pins 101 and 102 and fixed by fixing screws 103, 104 and 105. As shown in FIG. Cross spindles 107, 108, and 109 that can be machined in a right-angled direction are assembled in parallel so as to face the drills 36b to 36d.

The rotation of the cross spindles 107 to 109 is driven by the drive shaft 110.
Drive gear 11 at the tip of drive shaft 111 that is more conductive
2, the drive gear 113 is conducted and the cross spindle
107 is rotated, and the drive gear 114 is transmitted to rotate the cross spindle 108.
The drive gear 116 is transmitted via the idle gear 115, and the cross spindle 109 rotates.

Then, the cross spindle and 107 to 109 are cutting blades 36b.
~ 36d Operates the drilling on the work material during the backward movement of the cutting edge on the extension line.

As shown in FIG. 7C, there are two parallel through-holes formed in the front and rear of the cross body in the upper layer of the cross spindles 107 to 109, and the tip which is supposed to slide in the sleeve 119 by the hydraulic pressure 117, 118. Pistons 122 and 123 integrally provided with facing racks 120 and 121 are mounted.

In the figure, reference numerals 124 and 125 denote a rack lid and a body lid that cover the front and rear of the above rack mechanism.

As shown in FIG. a, a pinion shaft 126 that engages with the racks 120 and 121 is attached to a shaft hole that is recessed from the upper surface of the cross body 100 and stands up.

The core of the pinion shaft 126 is the cross spindle 1
It shall be on the 108 core wire located in the center of 07-109.

The rising protrusion of the pinion shaft 126 is the cross body.
An arm shaft 128 fixed to 100 with a fixing screw 127 is surrounded by bearings 129 and 130.

The base of a front arm 131 is pivotally fixed to the arm shaft 128, and the front arm 131 is integrated with the pinion shaft 126 via an adjusting arm 132.

That is, as shown in FIGS. A and b, the tip of the adjusting arm 132 whose base is fixed to the upper end of the pinion shaft 126 by the washer 133 and the fixing screw 134 has the adjusting screws 135 and 136.
It is fixed to the front arm 131 via.

Then, the pinion shaft 126 and the front arm 131 are integrated via the adjusting arm 132.

Front spindles 137 to 139 are mounted on the front end of the front arm 131 in a row on a line orthogonal to the arm axis via adjusting sleeves 140 and fixing nuts 141 as shown in FIG.

The front spindles 137 to 139 are provided in the same spacing configuration (the configuration facing the drills 36b to 36d) as the above-described cross spindles 107 to 109.

With the above configuration, the turning of the pinion shaft 126 is converted into the sliding movement of the front arm 131, but the turning of the pinion shaft 126 is caused by the hydraulic drive of the racks 120 and 121.

Bipolar postures of the front arm 131 are shown in FIGS. B, c, and a. Since a is a posture that acts on the work material, stability at that position is important. Since the position 121 is set at the extreme advance position by the hydraulic pressure, the position fixing is extremely reliable and stable, as is clear from the description of the 4-position position selecting mechanism described above.

The cross spindles 107 to 109 and the front spindles 137 to 139 are aligned on the main axis direction line as shown in FIG.

This fine adjustment of coincidence is performed by the adjusting screws 135 and 136.

Then, by swinging the front arm 131 in the manner shown in FIG. A, it is possible to perform two machining operations, that is, cross machining and front hole drilling, at one position.

Since the drills on the cross spindle and front spindle can be replaced, various combinations can be made, and these are all the same mounting base cross body.
Since it is mounted on the 100, the combination can be changed very easily and quickly.

Therefore, two types of drilling, a right angle and a front hole, can be easily performed on the position extension lines of the cutting tools 36b to 36d in the 4-position position selecting mechanism proposed by the applicant.

Moreover, the structure for this purpose is to utilize the space on the opposite side of the cutting tools 36b to 36d in a rational and effective manner and to provide two types of drilling functions in two layers, which makes the device compact. . Therefore, the device does not increase in size at all, the space occupied by the device can be kept small, and the multifunctional downsizing is achieved.

In the present application, further, in the headstock moving type automatic lathe, if the four positions above can be increased without complicating and increasing the size, naturally the function is further improved, which is preferable. In some cases, there is a case where a surface slitting process performed from a right angle direction other than the above-mentioned right angle direction drilling process and front face drilling process is desired, and if it is possible to meet this request, in view of the situation that is more suitable, 4 above
In the position / position selection mechanism, the slider and the piston rod are fixed by interposing a cylinder having a half stroke of the piston rod, and further, a hydraulic circuit for driving the piston rod fixed to the slide base side. If a flow rate adjusting valve circuit is additionally provided inside, the number of positions is increased from 4 to 8, and when the positions are changed, the moving direction of the slider 23 of the mounting base coincides with the face slitting direction. Japanese Patent Application No. 62-265847 proposes a position / position selection mechanism that enables surface slide processing by replacing the spindle.

11 a to d are front views of the position / position selection mechanism,
It is a left side view, a right side view, and the d-d arrow view in a figure.

In the figure, the same components as those in FIG. 5 are designated by the same reference numerals or symbols are omitted.

In the figure, reference numeral 200 denotes a cylinder added to the bracket 31, and the tip of the piston 24 is fixed to the piston 201 mounted on the cylinder 200 via the position adjusting screw 30.

The stroke of the piston 201 is set to half that of the piston 24.

In the figure, 200a and 200b are cylinder lids.

Although the illustrated mode is a mode in which oil pressure is applied to the oil passage F of the oil passages E and F provided in the cylinder 200, the fixed positional relationship between the piston 24 and the slider 23 at this time is the fifth embodiment described above.
Matches the figure.

That is, with the oil pressure being applied to the oil passage F, the oil passages A to
By applying hydraulic pressure to D, the sixth
The four positions shown in FIGS. And the above 4
When hydraulic pressure is applied to the oil passage E at the position position, the slider 23 is displaced by the stroke of the piston 201, that is, the stroke of half of the piston 24.

Therefore, 4 positions + 4 positions = 8 positions are established.

The eight positions are shown in FIGS.

In the figure, e, g, i, and k match with FIG.
j and l are displaced by a stroke that is half that in FIGS.

Therefore, in addition to the four positions shown in FIGS. 8A to 8C, a new four position displaced by half the stroke of the piston 24 is added.
Positions will be added.

As shown in FIG. 11m corresponding to FIG. 9a, the position newly added in this way is used, for example, from the mounting base frame of the cutting blade 36b to the cutting blades 36b and 36b.
Take-out arm 20 for spindle mounting at an intermediate position with c
By adding 2 and arranging a new cutting blade at the intermediate position (newly added position), the function can be improved.

Next, FIG. 11n is a control explanatory view of the oil passages C and D of the cylinder 21b which is added to the above construction, and as shown in FIG.
In addition to the hydraulic switching valve 203 having the valves A ₁ A ₂ , the oil passage C
A hydraulic switching valve 205 having a new valve B ₁ B ₂ having a flow rate adjusting valve 204 is additionally provided on the way.

Then, when the hydraulic pressure switching valve 203 is switched to A ₂ and the hydraulic pressure switching valve 205 is switched to B ₂ , the flow rate adjusting valve 204 can be operated, and the piston
You can control the speed of 25 freely.

Then, for example, as shown in FIG. 11m, a spindle 206 for face sliding machining is used instead of the cross spindle 107.
If the spindle 206 is installed, first, after positioning the spindle 206 at an eccentric position intermediate between the cutting blades 36a and 36b,
If the hydraulic pressure is applied to the oil passage C through the flow rate adjusting valve 204, and the stroke of the piston 25 (crossing the work) is slowly observed while visually observing, it is possible to carry out the chamfering under suitable conditions. The spindle 206 for use can act on the work material.

That is, in this case, the piston 25 is used not only for positioning, but also for face sliding.

"Problems to be solved by the invention" Due to various proposals, it has been possible to greatly enhance multi-functionality, but the content is to enable various types of cutting in one position and multiple positions. However, it does not enable simultaneous cutting of different kinds in one position.

However, in order to reduce the cycle time of product processing, there is a demand to perform front hole drilling and outer diameter cutting at the same time, but the above proposals cannot meet such requests. .

In view of the above circumstances, the present invention is based on the position position selecting mechanism proposed by the present applicant,
It is an object of the present invention to provide a mechanism capable of simultaneously performing front face boring and outer diameter cutting.

"Means for Solving the Problems" In order to achieve the above object, in the mechanism of the present invention,
It is equipped with a twin-barrel cylinder block with a separate structure for both the slider as the mounting base of the cutting blade and the slide base as the slide guide base of the slider, which is installed in the bush base frame of the headstock moving type automatic lathe. One of the two piston rods is fixed 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. The slider can be moved to the limit position corresponding to the stroke of the piston rod with respect to the cylinder block, and finally the slider can be moved to four different positions with respect to the slide base. At the facing part of the cutting edge for outer diameter cutting equipped in parallel, A fixed front slide base is arranged on the slider that holds the slider so that it can be slid through a cross roller or the like, and the front slider is taken out from the bush base frame. It is assumed that the slide base slides through the arm so that it cannot move in the same direction, and the slider slide can move in the same direction, and the pinion shaft engages with the rack at the confronting position hydraulically driven on the front slider. Provide a drill mechanism that is erected vertically and that has a front spindle that is assembled at the tip of the arm that performs front hole drilling at the same spacing as the facing cutting blade on the pinion shaft. It is what

It is preferable that the front spindle is supported by a cylinder so that it can move back and forth in the main shaft moving direction.

Further, in the 4-position position selecting mechanism, it is preferable that the slider and the piston rod are fixed by interposing a cylinder having the same stroke as the stroke of the piston rod so that one additional position can be provided.

[Operation] According to the position selection mechanism configured as described above, in the outer diameter cutting process by sliding the slide base, the front spindle for front hole drilling can be operated without changing, so the outer diameter It is possible to perform both cutting and front face drilling at the same time.

At the time of front face boring, the front face spindle can move back and forth in the main shaft moving direction, so ideal cutting can be performed while removing chips.

Further, since one position can be additionally installed, it is possible to install five types of cutting blades for outer diameter cutting, which are usually prepared, on a line.

[Example] An example will be described with reference to the drawings.

1a is a surface view of a guide bush frame of a headstock moving type automatic lathe equipped with the position selection mechanism of the present invention, and FIGS. 1b to 1d are explanatory views of the relationship between a front slide base, a front slider and a front spindle, 1E to 1H are explanatory views of a 4-position position selecting mechanism in which one position is additionally provided.

In FIG. 1a, the drill mechanism indicated by reference numeral 300 is
The front spindles 137 to 139 for front face boring shown in FIGS. 10A to 10C described above.

In the present invention, the drill mechanism 300 cannot have a cross spindle in the lower layer as shown in FIG. This is because the front slider 301, which is the mounting base of the drill mechanism 300, is configured such that the slider 23 and the slider 23 are trimmed in the sliding direction of the slide base 22 as shown in FIGS. Slider for movement direction
Since it can not move the same as 23, it slides like the various cutting blades already mentioned.
This is because cutting cannot be performed by moving 22 (slider 23 is moved together).

The front slider 301 is held by a front slide base 303 via cross rollers 302, 302 and the like, and the front slide base 303 is integrally fixed to the slider 23.

The front slide base 303 is obtained by fitting a slide plate 306 attached to the tip of the groove type guide 305 in the sliding direction of the slider 23 provided at the tip of the arm 304 taken out from the bush base frame 5. As for the sliding direction of the slide base 22, the slider 22 does not move along with the slider 22, but is locked in the sliding direction of the slider 22 and guided by the groove type guide 35 to be completely integrated with the slider 22. It is supposed to move together.

Therefore, the drill mechanism 300 is positioned immovably in the sliding direction of the slide base 23, but moves in the sliding direction of the slider 22.

The front spindles 137 to 139 are integrally set to the piston 308 of the cylinder 307 as shown in FIG. B, so that the front holes can be efficiently drilled while removing the chips that can move back and forth in the main shaft moving direction. I can. The same components of the drill mechanism 300 as those in FIG. 10 are designated by the same reference numerals.

In Fig. a, five cutting tools for outer diameter cutting 36a ~
e is disposed only on one side, and 36a to 36c face the front spindles 137 to 139.

Therefore, the simultaneous construction of front face drilling and outer diameter cutting is
It can be done between three sets of cutting tools 36a-c and front spindles 137-139.

As mentioned above, if the cutting tools 36a-e for outer diameter cutting, which should normally secure at least 5 types, can only be arranged on one side by design, it is necessary to add one position at the same interval. However, this is easily achieved by setting the stroke of the piston 201 described in FIG. 11 to be the same as that of the piston 24.

That is, in the figures, the same components as those in FIG.
309 is a cylinder added to the bracket 31. The piston 310 is attached to the cylinder 309 and the piston 24
The tip of the is fixed via the position adjusting screw 311.

The stroke of the piston 310 is set to be the same as that of the piston 24.

In the figure, 309a and 309b are cylinder lids.

Although the illustrated mode is a mode in which oil pressure is applied to the oil passage F of the oil passages E and F provided in the cylinder 309, the fixed positional relationship between the piston 24 and the slider 23 at this time is the fifth embodiment described above.
Matches the figure.

That is, with the oil pressure being applied to the oil passage F, the oil passages A to
By applying hydraulic pressure to D, the sixth
The four positions shown in FIGS. When the hydraulic pressure is applied to the oil passage E at the above-mentioned four-position position, the piston
The slider 23 is displaced by the stroke of 310, that is, the stroke of the piston 24.

Then, one position is set outside the four positions (actually, four positions are added, but since it is wrapped with the existing positions of the other three positions).

Therefore, it becomes possible to select the position of 5 positions.

"Effects of the Invention" Since the present invention is configured as described above, it has the effects described below.

The front spindle for front face drilling moves along with the movement of the slider 23 for positioning the cutting edge for outer diameter cutting, but does not move along with the movement of the slide base 22 during outer diameter cutting. Drilling is possible, and outer diameter cutting and front face drilling can be performed at the same time.

Since the front spindle is supported so as to be able to move back and forth in the cylinder main axis moving direction, it is preferable that machining can be performed while removing cutting chips.

Further, even if there is no choice but to arrange five kinds of outer diameter cutting blades only on one side, in the four-position position selecting mechanism, the slider and the piston rod are fixed by the cylinder having the same stroke as the stroke of the piston rod. It is preferable that it can be counter-measured only by fixing it by interposing.

[Brief description of drawings]

1a is a surface view of a guide bush frame of a headstock moving type automatic lathe equipped with the position selection mechanism of the present invention, and FIGS. 1b to 1d are explanatory views of the relationship between a front slide base, a front slider and a front spindle, 1e to h are explanatory views of a 4-position position selection mechanism in which one position is additionally provided, FIGS. 2 to 4 are explanatory views of an example of a headstock moving type automatic lathe, and FIG.
FIG. 8 is an explanatory view of a 4-position position selecting mechanism proposed by the applicant in a prior application, and FIGS. 9A and 9B are guide bush frames of a headstock moving type automatic lathe equipped with the 4-position position selecting mechanism. Front and back views, FIGS. 10 a to 10 d are explanatory diagrams of the cross processing unit, and FIGS. 11 a to d are configuration explanatory diagrams of the position position selection mechanism proposed by the applicant in the prior application,
11 e to l are 8-position mode views of the mechanism, FIG. 11 m is a front view of a guide bush frame implementing the mechanism, and FIG. 11 n is a control explanatory diagram of oil passages C and D of the mechanism. is there. 300 …… Drill mechanism, 301 …… Front slider, 302…
… Cross roller, 303 …… Front slide, 304 ……
Arm, 305 …… Groove type guide, 306 …… Slide frame, 307 …… Cylinder, 308 …… Piston, 309 ……
Cylinder, 309a, 309b …… Cylinder lid, 310 ……
Piston, 311 ...... position adjustment screw.

Claims (3)

[Claims] Claims: 1. A twin-body cylinder block having a slider as a mounting base for a cutting blade and a slide base as a slide guide base for the slider, which is to be assembled to a bush base frame of a headstock moving type automatic lathe, and has a separate structure. One of the two piston rods mounted on the slide base is fixed to the slide base so that the cylinder block can be moved to two extreme positions corresponding to the stroke of the piston rod with respect to the slide base, and the other piston rod is attached to the slider. In the 4-position position selection mechanism, the slider can be moved to the limit position corresponding to the stroke of the piston rod with respect to the cylinder block by fixing it to the side, and finally the slider can be moved to four different positions with respect to the slide base. Of the cutting blade for outer diameter cutting equipped with the slider in parallel. The front slider, which is cut in the sliding direction of the slide base, and the front slide base fixed to the slider that slidably holds the slide base via a cross roller or the like are disposed in the facing portion, and the front slider is bushed. It is assumed that the slide base cannot be moved in the same direction as the slide direction and the slider can be moved in the same direction via the arm that is carried out from the base frame. The pinion shaft is erected by meshing with each other, and the front spindle is attached to the tip of the arm. A position selection mechanism in a headstock moving type automatic lathe, which is characterized by being provided with a drill mechanism. 2. A position selecting mechanism in a headstock moving type automatic lathe according to claim 1, wherein the front spinndle is supported by a cylinder and is movable back and forth in a spindle moving direction. 3. A four-position position selecting mechanism, wherein a slider and a piston rod are fixed by interposing a cylinder having the same stroke as the stroke of the piston rod so that one position is additionally provided. A position selecting mechanism in the headstock moving type automatic lathe according to claim 2.