JPH0645085B2 - Cross processing unit added to 4-position position selection mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is a cross machining unit added to a four-position selection mechanism used for indexing various blades for machining in a headstock moving type automatic lathe. Regarding

"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 arranged in opposition to 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 with high accuracy in the axial direction. Then, L-shaped blocks in which the large-diameter pins 15 or 16 protruding from the slider 14 are fixed to the bottom surfaces of the tool rests 7A to 7D that are in a pair and are opposed to each other.
Contact from the back of 18 to make the servomotor 9 forward / backward 2
Two turrets 7A, 7D or 7 using different types of rotation
It is configured to send B 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 member of the bar which is rotated at high speed by the main shaft is rotatably supported by the guide bush to prevent the bending deformation of the bar to be 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 showing the state of the lifting mechanism at the 4 position, and FIG. 7 is a view showing a mounting state of the slider equipped with the 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 (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 the pair members that compose this mechanism with a design that can accommodate relative displacement, but this ensures that each pair member is set to the same temperature. Therefore, the deterioration of the operation 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. Inconvenience due to heat transfer expansion is avoided, which is preferable.

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.

Incidentally, 39 and 39 'in FIG. 7 are forward / backward guide liners of 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 adjustment screw 40 is mounted so that the bracket 31 hits 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 D, 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.

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 the positions [2] and [3] as shown in FIG.

A mode in which the forward / backward guide liners 39, 39 'are inclined with respect to the bush base frame is shown in FIGS.

According to this, since the slide base 22 is always provided with the automatic downhill urging force, the slide base 22 can be smoothly moved in the same direction 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 indicates a lead screw / nut mechanism using a ball screw and a nut mounted on the servo motor 43, and 45 indicates a brake device for automatic downhill braking which 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 variable-diameter cutting process on the work material.

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

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

However, in automatic lathes, not only the above-mentioned variable-diameter cutting work but also drilling work from the vertical direction to the work material is required, and the work material is held stationary on the bush and held in the right-angled direction. More rotary drilling is also necessary.

Conventionally, in order to satisfy such processing, 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, or drilled from the vertical direction. With regard to the above, an independent moving table was placed on the extension of the main spindle line, and a drill was attached to this.

"Problems to be solved by the invention" However, with the above-mentioned means, the turret becomes extremely complicated, and in the means of disposing an independent moving table, the tool stand becomes complicated. This is not preferable because the device becomes large.

"Means for Solving Problems" and "Operation" The present invention has been made in view of the above circumstances, and the gist of the present invention is to use four positions which are assembled in the above guide bush frame. In the position selection mechanism, three cross spindles, which are attached with a rotary drive source and are drilled from the right angle direction, are assembled in parallel, and a hydraulically driven confrontation is provided above the center line of the center of the cross spindles. Set up a pinion shaft that is meshed with a rack in a coordinated position, and perform vertical drilling on the pinion shaft at the same intervals as the above three cross spindles. Attach the front arm to which it is attached to the cross body where the drill mechanism is provided in two layers, and the cross spindle is fixed to three sliders. It is possible to equip the slider with a drilling mechanism in the right angle direction and a drilling mechanism in the vertical direction in a compact manner by mounting it on the slider in a configuration facing the blade by screwing. The point is to make effective use and further convenience.

[Example] Hereinafter, this will be described in detail with reference to the drawings.

In addition, the unit of the present invention is mounted in the above-mentioned FIG. 9a.

1A to 1D are a vertical sectional view of the unit when the front spindle is operating, a view in the direction of arrow b in the figure, a view in the direction of arrows c to c, and a view in the direction of arrows d to d in the case of the front spindle standby.

In FIG. 2, 100 in the figure is the cutting blade 3 on the slider 23.
6b ~ 36d is a cross body that is positioned by the positioning pins 101 and 102 on the opposite side and fixed with fixing screws 103, 104 and 105. Machinable cross spindles 107, 108, and 109 are mounted in parallel in a configuration facing the drills b to d.

The rotation movement of the cross spindle 107 to 109 is the drive shaft 110.
Drive gear 11 at the tip of the drive shaft 111 that is more transmitted
2, the drive gear 113 is transmitted 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 Figure c, there are two parallel through holes formed in the upper and lower layers of the cross spindles 107 to 109 in the front and back of the cross body, and these through holes are opposed to the tip which is supposed to slide in the sleeve 119 by hydraulic pressure 117, 118. The racks 120 and 121 are fitted with pistons 122 and 123 that are integrated with each other.

In the figure, 124 and 125 are 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 meshes 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 with 100 fixing screws 127 is surrounded by bearings 129, 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 a and b, the washer 133 and the fixing screw 1
The tip of the adjusting arm 132, whose base is fixed to the upper end of the pinion shaft 126 by 34, is fixed to the front arm 131 via adjusting screws 135 and 136.

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

Front spindles 137 to 139 are attached to the front end of the front arm 131 in rows on a line orthogonal to the arm axis via an adjusting sleeve 140 and a fixing nut 141 as shown in FIG.

The front spindles 137 to 139 are arranged at the same intervals as the above-described cross spindles 107 to 109. With the above configuration, the turning of the pinion shaft 126 is converted into the swinging 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.

Thus, by swinging the front arm 131 in the manner shown in FIG.
Two processes are possible.

Since the drills on the cross spindle and the front spindle can be exchanged, various combinations can be made, and these are all the same mounting base cross body 10
Since it is mounted at 0, the combination can be changed very easily and quickly.

[Advantage of the Invention] According to the present invention, two kinds of drilling can be easily performed in the right angle and vertical directions on the position extension line of the cutting tools 36b to 36d in the 4-position position selecting mechanism proposed by the present applicant. Is extremely advantageous.

In addition, the component 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 since two types of drilling functions are provided in two layers, the device becomes 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 can be achieved.

Further, since the operation position and the standby position conversion of the front spindle are set to the hydraulic limit position, it is very preferable that the position is maintained quickly and stably during operation.

In addition, since the front spindle swings and is converted into the operating position and the standby position, it is advantageous that chips do not stay in the tool.

As described above, the effectiveness of the 4-position selection mechanism is further improved by the unit of the present invention, and its practical significance is extremely high.

[Brief description of drawings]

FIGS. 1A to 1D are longitudinal sectional views of the unit when the front spindle is operating, a view of the arrow a in FIG.
The same c-c arrow view, the d-d arrow view in a figure, and FIGS. 2-4 are explanatory drawings of an example of a headstock movement type automatic lathe, FIGS. 5-8.
The figure is an explanatory view of a 4-position position selection mechanism proposed by the applicant in the prior application, and FIGS. 9A and 9B are tables of guide bush frames of a headstock moving automatic lathe equipped with the 4-position position selection mechanism. It is a back view. 100 …… Cross body, 101,102 …… Positioning pin, 103,10
4,105 …… Fixing screw, 106 …… Bottom plate, 107,108,109 …… Cross spindle, 110 …… Drive shaft, 111 …… Drive shaft, 112 …… Drive gear, 113,114 …… Drive gear, 115
…… Idol gear, 116 …… Drive gear, 117,118 ……
Hydraulic pressure, 119 …… Sleeve, 120,121 …… Confronting rack, 122,
123 …… Piston, 124 …… Rack lid, 125 …… Main body lid, 1
26 …… pinion shaft, 127 …… fixing screw, 128 …… arm shaft, 129,130 …… bearing, 131 …… front arm, 132 …… adjustment arm, 133 …… washer, 134…
… Fixing screw, 135,136 …… Adjusting screw, 137,138,139 …… Front spindle, 140 …… Adjusting sleeve, 141 …… Fixing nut.

Claims (2)

[Claims] Claims: 1. Three cross spindles, which are attached with a rotary drive source and which are drilled from a right angle direction, are assembled in parallel, and a hydraulically driven confronting arrangement is provided above the center line of the center of the cross spindles. Position the pinion shaft that is meshed with the rack at the top of the rack and assemble the three front spindles on the end of the arm that perform vertical drilling on the pinion shaft at the same intervals as the above three cross spindles. On the slider, the front body arm is integrally connected, and the drill body is provided in two layers, and the cross main body is arranged so that the cross spindle faces three bites fixed on the slider described later. It is mounted on the bush base frame of the headstock movement type automatic lathe, which is mounted by screwing on the For both the slider and the slide base as the slide guide base of the slider, one of the two piston rods equipped in the separated double-hulled cylinder block is fixed to the slide base, and the cylinder block is attached to the slide base. The slider can be moved to two extreme positions corresponding to the stroke of the piston rod, the other piston rod can be fixed to the slider side, and the slider can be moved to the extreme position corresponding to the stroke of the piston rod with respect to the cylinder block. A cross processing unit that is added to a 4-position position selection mechanism that can be moved to four different positions with respect to the slide table. 2. A spindle to be added to a bush base frame of a headstock moving type automatic lathe having a four-position position selecting mechanism, which is assembled to an advance / retreat guide liner constructed by inclining a slide base to the bush base frame. The cloth processing unit according to claim 1, which is a table-moving type automatic lathe.