JPH07136820A - Boring machine and control thereof - Google Patents

Abstract

PURPOSE:To reduce cost by facilitating adjustment of working depth, shortening cycle time, and making a device compact. CONSTITUTION:A jig unit 4 and a tail stock unit 5 are connected together through their hydraulic cylinders 10, 11 so that they are freely connected together and separated from one another, and the tail stock unit 5 is fixed at a specific point on a frame 2 during a specific period in a working process, and the hydraulic cylinders 10, 11 are used when feeding is carried out at highly accurately omitting a screw rod 7, while the hydraulic cylinder is operated in an auxiliary manner in a high speed feeding mode in which the screw rod 7 is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring machine for applying numerical control to perform machining from both sides of a work and a control method thereof.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 14, a boring machine for machining from both sides of a work is a jig unit J which can be attached to and detached from a spindle unit M fixed to a frame F.
And a tailstock unit T are sent by respective hydraulic cylinders C ₁ and C ₂ , and, as shown in FIG. 15, a jig unit J for holding a work is fixed to a frame F and each screw rod B is fixed. _{There has been one} in which numerical control spindle units M ₁ and M ₂ on both sides which can freely come into contact with and separate from the jig unit J by ₁ and B ₂ perform boring of a hole in a work.

[0003]

In the structure shown in FIG. 14, since boring is performed at the cylinder ends of the hydraulic cylinders C ₁ and C ₂ , it is difficult to adjust the working depth, and the feed and return operations are difficult. Low speed (for example, general feed speed is 20m / min for ball screw feed, 5m / mi for hydraulic feed)
n) Therefore, there is a drawback that the cycle time is long and many limit switches are required for position confirmation. Further, the device shown in FIG. 15 has a problem that the device becomes large and the cost becomes high.

In view of such conventional problems, the present invention makes it possible to easily adjust the working depth, shorten the cycle time, reduce the number of limit switches, and downsize the device. An object of the present invention is to provide a boring machine having a low cost and a control method thereof.

[0005]

In order to achieve the above object, the present invention according to claim 1 fixes a spindle unit for boring to one end of an upper surface of a frame to support a workpiece. In a boring machine in which a tool unit and a tailstock unit facing the spindle unit with the jig unit sandwiched therebetween are slidably arranged on a frame, and the jig unit is driven by a ball screw to slide. A connecting means for connecting the jig unit and the tail stock unit so that they can come into contact with and separating from each other, and a positioning fixing means for positioning and fixing the tail stock unit at a predetermined position on the frame. The gist of the present invention described in 2 is that, in the coupling means, the jig unit and the tail stock unit are arranged in parallel to the screw rod. The both hydraulic cylinders fixed, and a common rod to which each piston engaging with the both hydraulic cylinders is fixed, the two hydraulic cylinders are coupled via the common rod. In the boring machine, the gist of the present invention according to claim 3 is:
The positioning and fixing means includes a positioning cylinder provided on the frame side, and a positioning hole on the tailstock unit side into which the positioning pin is inserted by an operation of moving the positioning pin of the positioning cylinder. The boring machine according to claim 1, further comprising a protection member that is slidably biased outwardly to protect the inner surface. According to a fourth aspect of the present invention, a spindle unit for boring is fixed to one end of an upper surface of a frame, and a jig unit for supporting a work is made to face the spindle unit with the jig unit interposed therebetween. In the method of controlling the boring machine in which the tail stock unit and the tail stock unit are slidably arranged on the frame, and the jig unit is driven by a screw rod to slide, the jig unit and the tail stock unit are respectively separated. The tailstock unit is fixedly attached at a predetermined position on the frame for a predetermined period of the machining process by connecting it via a hydraulic cylinder so that the tailstock unit can be fed at a high precision without using a screw rod. However, it is characterized in that the hydraulic cylinder is operated auxiliary during high-speed feed using a screw rod.

[0006]

The boring machine according to the present invention comprises a connecting means for connecting the jig unit and the tail stock unit to each other so that they can come in contact with and separate from each other, and a positioning fixing means for positioning and fixing the tail stock unit at a predetermined position on the frame. By using a screw rod, the jig unit and the tailstock unit are fastened and fast-returned efficiently in a state where they are joined by the joining means, and when the feed that requires high accuracy is performed, positioning and fixing are performed. The tailstock unit is positioned and fixed at a predetermined position on the frame by means, and only the jig unit is sent to perform high-precision processing, enabling improvement of processing accuracy and shortening of cycle time. Engage with both cylinders fixed to the jig unit and the tailstock unit in parallel with the screw rods, respectively. And a common rod to which each piston is fixed, and by connecting the both cylinders via the common rod, space saving and cost reduction are enabled, and the positioning fixing means includes a positioning cylinder fixed to the frame. By providing a positioning hole on the tailstock unit side into which the positioning pin is inserted by the operation of the positioning pin of the positioning cylinder, machining with higher accuracy is possible, and the positioning hole is slidably fitted to the outside. Positioning is ensured by providing a protective member that is biased in the direction to protect the inner surface. A method for controlling a boring machine according to the present invention comprises a jig unit and a tail stock unit which are connected to and detachable from each other via respective hydraulic cylinders, and the tail stock unit is connected to the frame during a predetermined period of a machining process. It is fixed at a predetermined position above and a hydraulic cylinder is used when performing high-precision feed that does not use a ball screw.When high-speed feed using a ball screw is used, the hydraulic cylinder is operated as an auxiliary to improve machining accuracy and cycle time. It is possible to shorten.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A boring machine according to an embodiment of the present invention will be described in detail with reference to the drawings. In the boring machine used in this embodiment, as shown in FIG. 1, a spindle unit 1 for boring is fixed to one end of a frame 2, and a common bed 3 is provided on the frame 2. , The jig unit 4 supporting the work 6 and the tail stock unit 5 facing the spindle unit 1 with the jig unit 4 interposed therebetween are slidably arranged on the common bed 3, and the jig unit 4 Is slid by the rotation drive of the ball screw rod 7.

In this processing machine, both hydraulic cylinders 10 and 11 constituting a connecting means 9 for connecting the jig unit 4 and the tailstock unit 5 to each other so that they can be contacted and separated from each other, and the tailstock unit 5 on the frame 2. It is characterized in that a positioning cylinder 15 constituting a positioning fixing means 14 for positioning and fixing at a predetermined position and a hole member 16 engaging with this are provided.

The main spindle unit 1 has a main spindle head 21 fixed on a main spindle bed 20 fixed to a frame 2, and a main spindle 22 and a reverse rotation shaft 23 (see FIG. 11) provided on the main spindle head 21 each have a horizontal line. The bars 24 and 25 are mounted, and a plurality of shallow hole cutting tools 26 are mounted on the outside thereof, and each line bar 2 is driven by a spindle motor (not shown).
4, 25 and the shallow hole drilling tool 26 are rotationally driven so that the boring holes 6a of the work 6 are drilled by a plurality of boring blades 28 (see FIG. 11) attached to the line bars 24, 25. ing.

As shown in FIGS. 2 and 4, the common bed 3 has a flat sliding guide surface 34a formed on the upper ends of the left and right main supporting portions 34, 35 and a chevron sliding guide surface 35a having a chevron cross section. And the downward clamp receiving surfaces 34b and 35b facing the sliding guide surfaces 34a and 35a, respectively, and the ball screw rod 7 and the hydraulic cylinders 10 are provided between the left and right main supporting portions 34 and 35. An accommodation space 36 for accommodating 11 is formed.

As shown in FIGS. 7 and 8, the common bed 3 has bearing support portions 37, which are provided at positions near both ends.
37, bearings 38, 38 are arranged on the ball bearing 37, the ball screw rod 7 is horizontally supported by the bearing 38 along the front-rear direction, and the ball screw rod 7 is connected to a servo motor 39 fixed laterally at one end via a coupling 40. There is.

As shown in FIG. 7, the jig unit 4 includes a lower table 42 which is slidable in the front-rear direction (XX direction) along both sliding guide surfaces 34a and 35a of the common bed 3,
Further, there is provided an upper table 43 slidably mounted in the left-right direction (Y-Y direction) due to the relationship between the dovetail 42a and the dovetail groove 43a (see FIG. 2), and a predetermined position on the upper table 43. The work 6 is held.

In the jig unit 4, as shown in FIG. 7, a ball screw nut 44 is attached to the lower portion of the lower table 42 in a rotationally restrained state, and the ball screw nut 44 is screwed onto the ball screw rod 7 to make a servomotor. When the ball screw rod 7 is rotated by the rotational drive of 39, it linearly moves in the front-rear direction (XX direction) via the ball screw nut 44.

The jig unit 4 is provided with a cutter relief 46 (see FIGS. 4 and 5). In this cutter relief 46, a stop shock absorber 48 is attached to one side surface of the lower table 42 via a bracket 47, and a relief cylinder 49 is fixed to the other side surface.
A receiving member 50 provided for the stop shock absorber 48
Of the end of and the relief cylinder 49 in and out rod 49a
Of the upper table 43 faces the corresponding side surface of the upper table 43.

The tailstock unit 5 is arranged in the front-rear direction (X direction) along the sliding guide surfaces 34a, 35a of the common bed 3.
A tail head 53 (see FIGS. 1 and 11) is provided on a tail stock table 52 that is slidable in the −X direction), and a tail fitting portion 54 that faces each line bar 24, 25 on the main spindle unit 1 side is provided. The tail head 53 is provided with a plurality of shallow hole machining blades 55 mounted on the outer side thereof, and the shallow hole machining blades 55 are rotationally driven by a motor (not shown) on the tail side.

As shown in FIGS. 1, 4 and 9, the coupling means 9 includes hydraulic cylinders 10 and 11 fixed to the lower table 42 and the tailstock table 52 of the jig unit 4, a common rod 57, and a common rod 57, respectively. , The common rod 57
Fixed to both ends of the corresponding hydraulic cylinders 10,
11, a jig unit 4 and a tailstock unit 5 are provided through these pistons 58 and 59 which are slidable inside.
And are connected so that they can be separated from each other. The common rod 57 is shown in FIG.
And as shown in FIG. 6, a portion 57a on the jig unit 4 side.
And a portion 57b on the tailstock unit 5 side are connected by a joint 60 at an intermediate position so that the length can be adjusted.

As shown in FIGS. 4 and 5, the positioning fixing means 14 includes left and right positioning cylinders 15, 15 supported by cylinder brackets 62, 62 fixed to the frame 2 on both left and right sides of the common bed 3, and FIG. As shown in FIG. 9, the tail stock table 52 is provided with hole members 16 and 16 fixed to both left and right sides and tail stock clamps 64 and 64, and the hole member 16 is moved in and out by the operation of the positioning cylinder 15. Positioning pin 15a
A positioning hole 17 into which the positioning pin 15a is inserted by the projecting operation is provided, and the protection member 1 is slidably accommodated in the positioning hole 17 and biased outward by a compression spring 18.
9 is provided, and the inner surface of the positioning hole 17 has the protective member 19
Protected by.

As shown in FIG. 9, the protective member 19 is integrally provided with a flange-shaped retaining piece 19a at its inner end, and the retaining piece 19 is provided on a step surface 17a formed in the positioning hole 17.
a is hit and is prevented from coming off. And the hole member 16
The positioning pin 15a and the positioning hole 17 can be cleaned by connecting an air pipe to this and blowing air through the air pipe.

The tailstock clamp 64 has clamp cylinders 66, 66 (see FIG. 6) fixed to the left and right outer surfaces of the tailstock table 52 via respective brackets 65, and as shown in FIG. The disk-shaped head 68 is formed in the through holes 52a opened in the four corners of the
Each clamp shaft 68 having a is inserted, and the clamp piece 70 is screwed to the male screw 68b engraved at the tip of each clamp shaft 68, and the base end is attached to the clamp shaft 6.
A clamp lever 71 fitted to the outer circumference of the neck of 8 is provided,
The tip ends of the pair of left and right clamp levers 71 are pin-joined to the protruding ends of the sliding rods 67 of the corresponding clamp cylinders 66.

The tailstock clamp 64 is
When the clamp lever 71 is turned to the right by the operation of each clamp cylinder 66, the clamp piece 70 rises, and the clamp receiving surface 34b of the common bed 3 is pressed and clamped by its upper surface, and the clamp lever 71 is moved in the opposite direction. When turned, the clamp is released, and the tail stock clamp 6 on the side corresponding to the other clamp receiving surface 35b.
4 is also the same.

Both hydraulic cylinders 1 constituting the coupling means 9.
The 0, 11 and the positioning cylinder 15 are connected to a pressure oil source via respective cylinder switching valves (not shown), and perform predetermined operations with hydraulic pressures adjusted to the respective pressures. Further, the clamp cylinder 66 and the relief cylinder 49 are connected to a pressure air source via respective cylinder switching valves, and perform a predetermined operation by an air pressure adjusted to a pressure suitable for each.

As shown in FIG. 11, the workpiece 6 to be machined by the boring machine according to the embodiment of the present invention has a plurality of machining points on the inner surface of the machining hole 6a to be subjected to boring. , Both ends also have processing points that undergo drilling.

12 and 13 are a side view and a time chart of a main part for explaining the control method of the boring machine. The ball screw rod 7 is rotationally driven by the servomotor 39 from the original position shown in T ₁ of FIG. 12 (1) and FIG. 13 to fast-forward, and the jig unit 4 is moved to the line bars 24, 25.
12 (2) and L ₀ to a predetermined initial position shown in T ₂ of the FIG. 13, is when the movement L ₀ = 564 mm in the present embodiment.
At this time, since both cylinders are at the stroke ends, the tail stock table 52 is pulled by the lower table 42 of the jig unit 4 and moves in parallel, and the line bars 24 and 25 are moved.
Is the tail fitting unit 5 on the tailstock unit 5 side.
The position just before fitting to 4 is reached. Further, in order to prevent overrun due to inertial force of the tailstock unit 5, hydraulic pressures P ₁ and P ₄ are respectively applied to the left and right chambers of both cylinders.
Is working.

At a predetermined initial position shown by T ₂ in FIGS. 12 (2) and 13, the hydraulic pressure P ₁ in the left chamber of the hydraulic cylinder 11 on the tail side is lowered and the hydraulic pressure in the right chamber of the hydraulic cylinder 11 is changed to P ₂ . and switching to increase, as shown in T ₃ in FIG. 12 (3) and 13, the tail stock unit 5 L ₁ until the stroke end of the tail positioning cylinder 15, and the case is moved L ₁ = 44 mm in this embodiment The tip ends of the line bars 24 and 25 are fitted into the tail fitting portion 54 by approaching the jig unit 4. At this time, the positioning pin 15a for positioning the tail
And the positioning hole 17 of the hole member 16 coincide with each other, the positioning pin 15a is fitted into the positioning hole 17, the tail stock unit 5 is positioned on the common bed 3 and integrated, and then the clamp cylinder 66 is provided. Is operated so that the bed is securely fixed to the common bed 3. During this time, the cutter relief 46, the positioning pin 15a, and the positioning hole 17 are cleaned by air blow.

The ball screw rod 7 is driven from the position indicated by T ₃ in FIGS.
To the position shown in 3 of T _4, L ₂ the jig unit 4 to the left, to feed when L ₂ = 12 mm cutting of this embodiment, the tail stock unit 5 side of the shallow hole drilling and line bar 24,
Partial processing by 25 is performed. At this time, only the left chamber of the hydraulic cylinder 10 on the jig unit 4 side acts auxiliary.

The jig unit 4 is moved to the right from the position shown at T ₄ in FIGS. 12 (4) and 13 to the position shown at T ₅ in FIGS. 12 (5) and 13 by driving the ball screw rod 7. L ₂
= 12 mm, the cutting tool 55 for machining on the tail side is removed, and subsequently, in the case of this embodiment, 38 mm is cut and fed further to the right for boring by the line bars 24 and 25 and shallow hole machining on the spindle side. At this time, the hydraulic pressure P _{4 in} the right chamber of the cylinder acts as an auxiliary in the same manner as described above.

The jig unit 4 is moved leftward from the position shown at T ₅ in FIGS. 12 (5) and 13 to the position shown at T ₆ in FIGS. 12 (6) and 13 by driving the ball screw rod 7. L ₂
= 12 mm, and remove the cutting tool 26 for machining on the spindle side. At this time, the hydraulic pressure P ₄ of the right chamber of the hydraulic cylinder 10 acts as it is, and the positioning pin 15a and the tail stock clamp 64 are released.

The ball screw rod 7 is driven from the position shown at T ₆ in FIGS. 12 (6) and 13 to move the jig unit 4 further leftward to the position shown at T ₇ in FIGS. 12 (7) and 13. To L ₁ = 44 mm, and this is shown in FIG. 12 (3) and FIG.
3 to the position shown by T ₃ and at the same time, the hydraulic pressure P ₁ and hydraulic pressure P ₄ are applied to the left chamber of the hydraulic cylinder 11 and the right chamber of the hydraulic cylinder 10, respectively, and the tailstock unit 5 is moved to the positions shown in FIGS. Return to the predetermined initial position indicated by T ₂ in FIG. In the meantime, the cutter relief 46 and the positioning pin 15a
Also, the positioning holes 17 are cleaned by air blow.

The ball screw rod 7 is driven by the servomotor 39 to move the jig unit 4 to the line bars 24 and 25 shown in FIG.
2 (2) and the predetermined initial position shown at T ₂ in FIG. 13 are returned to the original position shown at T ₁ in FIG. 12 (1) and FIG.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the boring is not required on the end face and only boring is performed. It can be applied to work that should be done.

[0031]

According to the first aspect of the present invention, the connecting means for connecting the jig unit and the tail stock unit to each other so as to freely come into contact with each other, and the positioning and fixing means for positioning and fixing the tail stock unit at a predetermined position on the frame. And means
By using a screw rod, the jig unit and the tailstock unit can be efficiently fast-forwarded and fast-returned together when they are joined by the joining means. The tailstock unit can be positioned and fixed at a predetermined position on the frame by means of the means, and only the jig unit can be sent for high-precision processing, which improves the processing accuracy and shortens the cycle time. Play. Further, in the coupling means according to the present invention as set forth in claim 2, both hydraulic cylinders fixed to the jig unit and the tailstock unit in parallel with the screw rod, respectively, and engaged with the both hydraulic cylinders. A positioning rod according to the present invention according to claim 3, further comprising: a common rod to which each piston is fixed, and by connecting both hydraulic cylinders through the common rod, space saving and cost reduction can be achieved. The means is provided with a positioning cylinder fixed to the frame, and a positioning hole on the tailstock unit side into which the positioning pin is inserted by the positioning pin's ejecting operation, thereby performing processing with higher accuracy. The positioning hole is provided with a protective member that is slidably urged outward to protect the inner surface. It is ensured. In the control method according to the present invention as set forth in claim 4, the jig unit and the tail stock unit are connected to each other via respective hydraulic cylinders so that they can be freely separated from each other, and the tail stock unit is framed during a predetermined period of the machining process. High efficiency and high accuracy by fixing at the above predetermined position and using a hydraulic cylinder when performing high-precision feed without using a screw rod, and by auxiliary operation of the hydraulic cylinder during high-speed feed using a screw rod. Can be processed at low cost.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of a boring machine according to an embodiment of the present invention.

FIG. 2 is a side view showing a jig unit side portion of the boring machine according to the embodiment of the present invention.

3 is a side view showing the tailstock unit side portion in FIG. 2. FIG.

FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 is a plan view showing a portion on the jig unit side of the boring machine according to the embodiment of the present invention.

6 is a plan view showing a tailstock unit side portion in FIG. 5. FIG.

FIG. 7 is a partial vertical cross-sectional view of the boring machine according to the embodiment of the present invention.

FIG. 8 is a partial vertical cross-sectional view of the boring machine according to the embodiment of the present invention.

FIG. 9 is a view B-showing a part of FIG.
FIG.

10 is a top side view of FIG. 9. FIG.

FIG. 11 is a cutaway side view showing essential parts of a work to be processed and a processing blade of the boring machine according to the embodiment of the present invention.

FIG. 12 is a side view of essential parts for explaining a method for controlling the boring machine according to the embodiment of the present invention.

FIG. 13 is a timing chart for explaining a control method for the boring machine according to the embodiment of the present invention.

FIG. 14 is a side view showing a conventional boring machine.

FIG. 15 is a side view showing another conventional boring machine.

[Explanation of symbols]

 1 Spindle Unit 2 Frame 3 Common Bed 4 Jig Unit 5 Tail Stock Unit 6 Work 6a Machining Hole 7 Ball Screw Rod 9 Coupling Means 10, 11 Hydraulic Cylinder 14 Positioning Fixing Means 15 Positioning Cylinder 15a Positioning Pin 16 Hole Member 17 Positioning Hole 18 Compression Spring 19 Protective member 26 Shallow hole cutting tool 28 Boring knife 55 55 Shallow hole cutting tool 57 Common rod 58, 59 Piston 60 Joint 64 Tailstock clamp

Claims (4)

[Claims] 1. A jig unit for supporting a work by fixing a spindle unit for boring to one end of an upper surface of a frame, and a tailstock unit opposed to the spindle unit with the jig unit sandwiched therebetween. Is slidably arranged on a frame, and in a boring machine that drives and slides the jig unit with a screw rod, a coupling means that couples the jig unit and the tailstock unit so that they can be separated from each other. A boring machine, comprising: positioning and fixing means for positioning and fixing the tailstock unit at a predetermined position on the frame. 2. A hydraulic cylinder fixed to the jig unit and the tailstock unit in parallel with the screw rod and pistons engaging with the hydraulic cylinder are fixed to the connecting means. The boring machine according to claim 1, further comprising: a common rod, wherein the two hydraulic cylinders are connected to each other via the common rod. 3. The positioning and fixing means includes a positioning cylinder provided on the frame side, and a positioning hole on the tailstock unit side into which the positioning pin is inserted when the positioning pin is ejected. 2. The boring machine according to claim 1, wherein the positioning hole is provided with a protection member that is slidably urged outward to protect the inner surface. 4. A jig unit for supporting a work by fixing a spindle unit for boring to one end of an upper surface of a frame, and a tailstock unit facing the spindle unit with the jig unit sandwiched therebetween. Is slidably arranged on a frame, and in the method of controlling a boring machine in which the jig unit is driven and slid by a screw rod, the jig unit and the tailstock unit are provided via respective hydraulic cylinders. The tailstock unit is fixed at a predetermined position on the frame for a predetermined period of the machining process, and a hydraulic cylinder is used for high-precision feeding without using a screw rod. A control method for boring machines, characterized in that the hydraulic cylinder is operated auxiliary during high-speed feed.