JP3792451B2 - Electric drill / tapping machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for performing processing (for example, drilling or tapping) on a workpiece (workpiece) with a tool (drill, tap, etc.) rotated and retreated by an electric motor, and particularly has a spindle on which the tool is mounted. The present invention relates to an electric drill / tapping device with a long ram advance / retreat stroke.
[0002]
[Prior art]
As the electric drill / tapping apparatus, one as shown in FIG. 2 is known.
As shown in FIG. 2 (a), which is a front sectional view, this conventional electric drill / tapping device 1 'is attached to a hollow frame 10' and the front of the frame 10 ', and a ram 20' is inserted. A cylinder part 11 'having a slide metal 12' at the tip part, a ram 20 'having a spindle 21' at the tip part to which a tool is mounted and rotating, and a base end part of the ram 20 'are fitted via screws. Center bar 22 ', a ball screw 30' rotatably supported in the frame 10 'in parallel with the ram 20', and a guide bar 40 fixed in the frame 10 'through the bush in parallel with the ram 20'. 'And a screw supporter 50'. Here, as shown in FIG. 2B, which is a right side cross-sectional view, the screw supporter 50 ′ includes an insertion part 51 ′ through which the guide bar 40 ′ is inserted, and a clamping part 52 ′ that clamps the center bar 22 ′. And a nut portion 53 ′ that is screwed into the ball screw 30 ′.
[0003]
In this conventional electric drill / tapping apparatus 1 ', as shown in FIG. 2 (a), the spindle 21 is driven by one electric motor in a state where the cylinder portion 11' is clamped and fixed in a desired direction. 'And rotating the ball screw 30' by another electric motor, the screw supporter 50 'moves forward along the ball screw 30' up to the dotted line while being guided by the guide bar 40 ', and the ram 20' also slides. The tool advances to the position of the dotted line at the maximum while being guided by the metal 12 ', and the tool performs machining on the workpiece. That is, the ram 20 'having the spindle 21' is advanced and retracted by a ball screw mechanism, and the advance / retreat stroke S '(from the position of the solid line to the position of the dotted line) is about 120 mm here.
[0004]
[Problems to be solved by the invention]
However, in the conventional electric drill / tap processing apparatus 1 ', there are the following inconveniences when the ram 20' is moved forward and backward by following the structure.
(1) There is a gap for sliding movement between the insertion portion 51 'of the screw supporter 50' and the guide bar 40 '. Further, since the guide bar 40 'is fixed to the frame 10' via the bush, there is no radial restraining force. Therefore, as shown in FIG. 2 (b), when the ram 20 'advances and retreats, the screw supporter 50' rotates in the radial direction (arrow) around the ball screw 30 ', and the guide bar 40' is bent. As a result, the accuracy and rigidity such as parallelism and straightness deteriorate as the stroke becomes longer.
(2) Since the center bar 22 'is provided, the overall length of the apparatus increases with the increase of the stroke, and handling becomes difficult.
[0005]
Therefore, an object of the present invention is to provide an electric drill / tapping device that does not deteriorate accuracy and rigidity and does not extend the overall length of the device even if the ram advance / retreat stroke is lengthened.
[0006]
[Means for Solving the Problems]
The present invention is provided in order to achieve the above object, and the invention according to claim 1 (see, for example, FIG. 1) is for drilling or screwing a workpiece by a tool that is rotated by an electric motor and moves forward and backward. An electric drill / tap processing device (1) for performing vertical machining, which is held in a hollow frame (10) and a hole (11) formed in the frame (10) so as to be able to advance and retract, and the tool is mounted A ram (20) having a rotating spindle (21) at its tip, and a ball screw (30) disposed on the upper side in the frame (10) in parallel with the ram (20) and rotatably supported; straight line having the ram (20) and fixed to the bottom parallel with said frame (10) in the guide rail (41), a slider (42) movably supported on the guide rail (41), the Bearing (4 And), the is movably arranged on the frame (10), the fixed part (51) fixed the slider (42), the locking portion provided at the center the ram (20) by (52) and locking the base end portion, a nut portion which is arranged on the upper side with engaging a nut screwed to the ball screw (30) by (53), said slider (42 through the fixing portion to the bottom portion (51) And a screw supporter (50) fixed to the electric drill / tapping device (1).
That is, as compared with the conventional electric drill / tapping apparatus 1 ′, the linear bar 40 is used instead of the guide bar 40 ′ and the center bar 22 ′ is eliminated.
[0007]
In this electric drill / tap processing apparatus 1, when the spindle 21 is rotated and the ball screw 30 is rotated, the screw supporter 50 advances along the ball screw 30 following the linear bearing 40, and the ram 20 is also held in the hole 11. While moving forward. Therefore, according to this electric drill / tapping device 1, even if the advance / retreat stroke of the ram 20 is lengthened, (1) the ram 20 advances / retreats following the linear bearing 40 fixed in the frame 10, so that the accuracy is high. Further, since the ram 20 is advanced and retracted by being held in the hole 11 formed in the frame 10, the rigidity and accuracy are supplemented. (2) Since the center bar is eliminated, the total length of the apparatus does not extend.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an electric drill / tapping apparatus according to the present invention will be described in detail with reference to the drawings. In the figure, the left side is described as the front (front end) and the right side is the rear (base end), and the solid line is described as the state before movement, and the dotted line is described as the state after movement.
[0009]
1. Configuration of Electric Drill / Tap Processing Device An electric drill / tapping device 1 according to the present invention is used for machining (drilling or screwing) a workpiece (workpiece) with a tool (drill, tap, etc.) that is rotated by an electric motor and advances and retreats. As shown in FIG. 1 which is a front sectional view, the apparatus includes a frame 10, a ram 20, a ball screw 30, a linear bearing 40, and a screw supporter 50. Here, the electric motor (not shown) includes an induction motor installed in the ram 20 for rotating the spindle 21 and an AC servo motor installed in the frame 10 for rotating the ball screw 30. Hereinafter, each component will be described.
[0010]
(1) Frame 10
The frame 10 is a housing for housing each component to be described later, and has a hollow box shape inside. A circular hole 11 having substantially the same diameter as the ram 20 is formed on the front side of the frame 10.
[0011]
(2) Ram 20
The ram 20 is for holding the spindle 21 at its tip and moving it forward and backward, and has a cylindrical shape that is held in the hole 11 so as to be able to advance and retract. An inlay portion is provided between the ram 20 and the hole 11 to ensure the advance and retreat of the ram 20 with high accuracy, and grease lubrication is provided to ensure the smooth advance and retreat of the ram 20. The spindle 21 is rotated with a tool attached thereto. A tool chuck is attached to the tip of the spindle 21, and a tool such as a drill or a tap is attached to the tip of the tool chuck.
[0012]
(3) Ball screw 30
The ball screw 30 forms part of a ball screw mechanism that converts rotational motion into forward and backward motion, and is rotatably supported in the frame 10 in parallel with the ram 20, and a screw thread is threaded around it. It has a length substantially equal to the desired advance / retreat stroke S. The ball screw 30 is rotatably supported on the upper side in the frame 10 by bearings 30 a and 30 a embedded in the front side and the rear side of the frame 10.
[0013]
(4) Linear bearing 40
The linear bearing 40 is a linear guide for guiding the ram 20 during advance and retreat, and includes a guide rail 41 and a slider 42. The guide rail 41 is a track fixed in parallel with the ram 20 at the bottom in the frame 10 and has a length substantially equal to the desired advance / retreat stroke S. The slider 42 is a mover supported on the guide rail 41 so as to be movable. The linear bearing 40 is configured with high accuracy so that when the slider 42 moves on the guide rail 41, there is almost no blur in the vertical and horizontal directions.
[0014]
(5) Screw supporter 50
The screw supporter 50 is disposed in the frame 10 so as to be able to advance and retreat, and includes a fixing part 51, a locking part 52, and a nut part 53. The fixing portion 51 is attached to the lower portion of the screw supporter 50, and a plurality of bolts (not shown) are screwed into screw holes (not shown) formed in the slider 42, so that the lower surface thereof is fixed to the slider 42. It is a plate-shaped member. The locking portion 52 is formed in the middle portion of the screw supporter 50, and is a portion for locking the base end portion of the ram 20 on the front surface thereof. The lower portion includes a plurality of holes (not shown) and is inserted into the holes. The plurality of bolts 51 a are screwed into screw holes (not shown) formed in the fixing portion 51, so that their lower surfaces are fixed to the fixing portion 51. Further, the nut portion 53 is formed at the upper portion of the screw supporter 50 and includes a ball (not shown) inside a circular hole. The ball screw 30 is fitted into a thread formed on the ball screw 30, whereby the ball screw 30. It is a site | part screwed together. The nut portion 53 forms part of a ball screw mechanism that converts rotational motion into forward and backward motion. The screw supporter 50 is configured to accurately convert the rotational motion of the ball screw mechanism into the forward and backward motion of the ram 20 and to stably reflect the accuracy of the linear bearing 40 in the movement of the ram 20.
[0015]
(6) The electric drill / tapping device 1 according to the present invention includes a cylinder portion 11 ', a slide metal 12', a center bar 22 ', and a guide bar 40' as in the conventional electric drill / tapping device 1 '. Is not prepared.
[0016]
2. Operation of Electric Drill / Tapping Device In the electric drill / tapping device 1 according to the present invention, the ram 20 is advanced / retreated by a desired advance / retreat stroke S (about 250 mm) longer than the conventional advance / retreat stroke S ′ (about 120 mm). The operation of the case will be described.
[0017]
First, in a state where the frame 10 is fixed in a desired direction, when the spindle 21 is rotated by one electric motor and the ball screw 30 is rotated by another electric motor, the screw supporter 50 follows the linear bearing 40 and moves to the ball screw 30. Then, the tool advances to the position of the dotted line at the maximum, and the ram 20 also advances to the position of the dotted line at the maximum while being held in the hole 11, and the tool performs machining on the workpiece. That is, the ram 20 having the spindle 21 is advanced and retracted by a ball screw mechanism, and the advancing / retreating stroke S (from the position of the solid line to the position of the dotted line) is about 250 mm here.
Next, when the ball screw 30 is rotated reversely by another electric motor in a state where the workpiece has been processed, the ram 20 is retracted to the position of the solid line by the reverse operation to the above, and a series of operations is completed.
[0018]
In these cases, the ram 20 advances and retreats following the linear bearing 40 fixed in the frame 10. Therefore, the movement accuracy of the ram 20 at the time of advancement and retraction depends on the accuracy of the linear bearing 40, in other words, the linear bearing 40. Is reflected in the movement of the ram 20, and therefore the movement is very accurate.
Further, the ram 20 has its tip end held in the hole 11 formed in the frame 10, and its base end is locked to the screw supporter 50 fixed to the linear bearing 40. The movement accuracy is supplemented and the rigidity is secured.
Furthermore, since the electric drill / tapping apparatus 1 does not include a center bar, the overall length of the apparatus does not increase while having these advantages.
[0019]
【The invention's effect】
According to the electric drill tapping device according to the present invention constructed as described above, even by increasing the reciprocating stroke of the ram, accuracy and rigidity does not become poor, which does not extend even the overall length of the device, an electric drill -It has a remarkable effect that a tapping device can be provided.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing an electric drill / tapping apparatus according to the present invention.
FIGS. 2A and 2B are diagrams showing a conventional electric drill / tapping device, where FIG. 2A is a front sectional view, and FIG. 2B is a right side sectional view;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric drill / tapping device 10 Frame 11 Hole 20 Ram 21 Spindle 30 Ball screw 40 Linear bearing 41 Guide rail 42 Slider 50 Screw supporter 51 Fixed part 52 Locking part 53 Nut part S Advance / Retreat stroke

Claims (1)

An electric drill / tapping device (1) that performs drilling and tapping on a workpiece by a tool that is rotated and advanced by an electric motor,
A hollow frame (10);
A ram (20) having a spindle (21) at a tip end which is rotatably held in a hole (11) formed in the frame (10) and mounted with the tool;
A ball screw (30) disposed in parallel with the ram (20) on the upper side in the frame (10) and rotatably supported;
A guide rail (41) fixed to the bottom of the frame (10) parallel to the ram (20);
A slider (42) movably supported on the guide rail (41), and linear bearings (40) having,
A fixed portion (51) disposed in the frame (10) so as to be movable forward and backward, and fixed to the slider (42);
Locking portion provided in the center with (52) and engaging the proximal end portion of the ram (20), engages a nut screwed to the ball screw (30) by a nut part which is arranged on the upper side (53) And a screw supporter (50) fixed to the slider (42) via the fixing part (51) at the bottom ,
An electric drill / tapping apparatus (1) characterized by comprising:

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