JPS6179507A - Boring unit - Google Patents

Abstract

PURPOSE:To perform the boring of a specified diameter on a workpiece by adjusting the tool position at a quill end to change the boring radius of gyration by cutting tool by making a wedge body advance or retreat by reciprocating motion of the working rod of an advance or retreat adjusting mechanism. CONSTITUTION:A working rod 41 is reciprocated according to the commands from an NC controller (not shown in the figure). The advance or retreat of a wedge body 35 cause by the reciprocating motion of the rod 41 makes a swing body 20 and a quill 30 swing in the rotary direction of a pivot 26 determining the position in the axial direction of the wedge body 35. Since the radius of gyration of the end of a tool 31 and the end of the quill 30 is, therefore, to be specified value, a head stock 11 is advanced and a workpiece is bored in specified diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a boring machine, and more particularly to a hide position adjusting mechanism for changing a machining radius.

[Prior art]

An example of a conventional boring tool position adjustment mechanism is shown in FIG. 4. A tool holder 4a is supported on a quill 3 fixed to a main shaft 2 which is supported on a headstock 1 so as to be able to be moved in a semi-longitudinal direction, and an inclined protrusion 6a at the tip of an advancing/retracting rod 6 is engaged with the hide holder 4a to advance/retract. By reciprocating the rod 6 in the X direction, the tool holder 4a to which the hide 4 is fixed is moved in the radial direction, thereby changing the rotation radius of the tip of the hide 4. however,
With this structure, the m center position moves in the radial direction as the bite boulder 4a moves, so if the movement range is increased, rotational vibration will increase, the roundness and straightness of the machined hole will decrease, and the machining I couldn't raise my level.

On the other hand, there is a so-called swing type quill having a structure shown in FIG.

This fixes the quill 3 to a swinging body 7 that is pivotally supported at the tip of the main shaft 2 via a pivot 8, and connects a contact part 7b at the tip of a lever part 7a that projects rearward of the swinging body 7 to a spring 9.
The tip of the advancing/retracting rod 6 (L1i engages with the slope 6b,
The rotation radius of the tip of the hide 4 is changed by moving the loft 6 back and forth in the X direction to swing the quill 3 to which the hide 4 is fixed and the swinging body 7. With this structure, the centers of gravity of the quill 3 and the rocking body 7 are located near the pivot 8, which can reduce the movement of the center of gravity of the movable parts due to the above change. A spring 9 with a large pressing force is used to prevent the contact portion 7b and the inclined surface 6b from separating due to the centrifugal force generated in the spring 7a.
Therefore, it was difficult to increase the amount of movement of the hide 4.

(Problems to be Solved by the Invention) As mentioned above, the tool position adjustment mechanisms of conventional boring machines all have a small adjustment range, and although they were able to cope with wear and replacement of hides, It was not possible to handle a wide variety of workpieces with significantly different inner diameters. The present invention attempts to solve these problems.

[Means for solving problems]

For this purpose, as shown in an embodiment of FIGS. 1 to 3, the present invention includes a main spindle 12 which is supported on a headstock 11 and has a coaxial through hole 12a, and a main spindle rotation center 12 at the tip of the main spindle 12.
M passage 1 is pivoted via a pivot 26 orthogonal to 2X.
A rocking body 20 is provided with a lever part 21 located inside 2a that integrally projects rearward, and a rocking body 20 is integrally provided so as to project forward from this rocking body 20, and a tip part thereof projects in a radial direction perpendicular to a pivot 26. A quill 30 having a bite 31, a wedge body 35 that is supported in a through hole 12a so as to be able to pivot and has an inclined surface 35a that engages with the tip of one side surface 21a of the lever part 21, and a wedge body 35 that is movable back and forth. One side 21a
In a boring machine equipped with a forward/backward adjusting mechanism 40 that swings the rocking body 20 and the quill 30 around the pivot 26 by engagement between the tip end of the lever part 21 and the inclined surface 35a, The center of gravity G of the lever portion 21 is shifted to the one side 21a side by cutting the material, and the center of gravity is always kept at the center of rotation of the main shaft 1 within the entire swing range of the moving body 20.
2
The device is characterized in that a spring 23 is provided to press the tip of one side 21a of the device against the inclined surface 35a.

[Effect]

As the wedge body 35 advances and retreats, the insect body 20 and the quill 30 swing around the pivot 26, and the rotational half of the tip of the high 1-31 is changed. The center of gravity G of the lever portion 21 that protrudes rearward from the rocking body 20 is always located closer to the one side surface 21a than the main shaft rotation center 12X in the entire 71 movement range of the rocking body 20. Therefore, the centrifugal force acting on the lever part 21 due to the rotation of the main shaft 12 is
It acts in a direction that always presses the tip of the tip a against the inclined surface 35a.

〔Effect of the invention〕

According to the present invention, in a swing type quill in which the movable part has only a small amount of movement, the center of gravity of the lever part is adjusted by shaving off the opposite side of one side of the lever part whose tip part engages with the 1st slope of the wedge body. Since the position is biased to one side, the centrifugal force acting on the lever part can always press the tip of the lever part against the inclined surface even if the quill swings at a fixed angle. Therefore, the spring that presses the tip of the lever part toward the slanted side around 1 need only have a small pressing force that compensates for the lack of centrifugal force, so it does not interfere with increasing the sliding angle of the quill. First, it is possible to widen the adjustment range of the rotation radius of the hide provided at the tip of the quill, making it possible to handle a wide variety of workpieces with significantly different inner diameters.

〔Example〕

In the embodiment shown in FIGS. 1 to 3, the main shaft 12 is 1u
It is supported by a headstock 11 placed on a working table 10, and is rotationally driven via a pulley 13 and a heald 14 fixed to the 1&end, and is also given feed movement in the direction of the spindle rotation center 12X together with the sliding table 10. It is being The main shaft 12 has a through hole 1 coaxially.
2a, and a bifurcated support protrusion 12b (third
(see figure), a rocking body 20 is pivotally supported via a pivot/port 26 perpendicular to the main shaft rotation center 12x.
A lever portion 21 that is integral with 0 and extends rearward is located within the through hole 12a. A quill 30 protrudes forward from the rocking body 20 and is fixed by a bolt (not shown) or the like via a flange portion 30a, and a cutting tool 31 is fixed to the tip of the quill 30, protruding in a radial direction perpendicular to the pivot 26. has been done. A damper 32 containing vibration-absorbing particles is provided at the tip of the quill 30. This rocking body 2
0, lever part 21, quill 30. The center of gravity of the hide 31, damper 32, etc. is located near the pivot 26.

The pivot 26 is pivotally supported on the support protrusion 12b by a needle bearing 27 whose backlash is removed by a bearing cover 28. Further, a cylindrical member 16 is fixed to the tip of the main shaft 12, and a support protrusion 12b and a swinging body 20 are provided on the inner surface of the cylindrical member 16.
A sealing 19 is provided between them. Furthermore, a guide cylinder 18 is fixed to the rear end of the main shaft 12, and supports an actuation rod 41 that pivots a wedge body 35, which will be described later, in a axially movable manner.

One side (upper side in FIG. 1) 21a of the lever part 21
A roller 22 is pivotally supported at the tip of the roller 22 so as to slightly protrude from the one side surface 21a. Eight fitting holes 21b are provided in the lever part 21 on the side opposite to the one side 21a, and the flesh on the opposite side of the lever part 2 is shaved to move the center of gravity G of the lever part 21 toward the one side 21a. bias. The main shaft 12 is provided with a detent key 17 that protrudes from the inner surface of the through hole 12a.
A wedge body 35 having a key m35b that engages with the wedge body 35 is fitted into the through hole 12a so as to be able to move only axially, and rotates together with the main shaft 12. The wedge body 35 is provided with an inclined surface 3'5a, forming a wedge shape with a thin wall on the tip side, and each fitting hole 21b of the lever part 21 has a slider 23 between it and the inner surface of the M passer 12a. A spring 24 is provided, and the spring 24 presses and engages the tip of the one side surface 21a of the lever portion 21 with the slope 35a via the roller 22.

The spring 24 supplements the pressing force between the tip of the one side surface 21a of the lever section 21 and the sloped surface 35a due to the centrifugal force present in the lever section 21, which will be described later. There is no need to provide it.

The axial position of the wedge body 35 is determined by a forward/backward adjusting mechanism 40 shown in FIG. When the wedge body 35 is in the most retracted state (see the solid line in Figure 1), the center line of the quill 30 is at the position 30P, and the tip of the hide 31 is at the minimum machining diameter d.
take the position. When the frame 35 is in the most advanced state (see the two-dot chain line C in FIG. 1), the lever part 21 and the quill 30 float counterclockwise around the pivot 26 to reach the two-dot chain line and the position B, respectively. The center line of the quill 30 is located at a position 30q, and the tip of the hide 31 is located at the maximum machining diameter. In this state, the lever part 21
The center of gravity G moves to the position of Ga, but the center of rotation of the main shaft is 12X
Therefore, the main shaft 12
The centrifugal force generated in the lever portion 21 due to zero rotation always acts to press the tip of the one side surface 21a of the lever portion 21 against the inclined surface 35a.

As shown in FIG. 2, the main parts of the advancing/retracting adjustment mechanism 40 are comprised of an operating rod 41 screwed to the wedge body 35 and rotating together with the main shaft 12, a movable body 42, a feed screw 44, and a servo motor 45. The servo motor 45 is attached to the sliding base 10 via a support base 50, and is operated by a command from the NC control device 1 (not shown) to drive the timing pulley 46. Through the timing heald 47 and timing pulley 48, the feed screw 44, which is pivotally supported on the slide table 10 by support blocks 49 and 49a, is rotated. The movable body 42 pivotally supports a connecting shaft 41a, which is fixed via a joint 41b to an operating loft 41 that rotates two times together with the main shaft 12, so as to be rotatable only.

The rotation of the above-mentioned feed dog 44 is caused by the Nand 43 which is screwed thereto.
．． The axial position of the wedge body 35 is determined by the servo motor 45, which operates in response to a command from the NC control device 1, and the tip of the hide 31 is moved in the axial direction. The radius of rotation becomes a predetermined value.In this state, the main shaft 21 is rotated 5 times, and the slide table 1
0 is advanced to perform boring processing on the workpiece W to a predetermined diameter. The specific numerical values of the illustrated embodiment are as follows.

Minimum machining diameter near 2mm Maximum machining diameter: 92mm Color circularity: 5μ or less Straightness: 5μ or more In the embodiment, the lever part 2 is connected by the fitting hole 21b.
1, and use this fitting hole 21 to attach the spring 2.
4 is provided, but it is also possible to reduce the thickness of the lever portion 21 by other means and provide a spring independently of this.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, and FIGS. 1 and 2 are longitudinal cross-sectional views of the front and rear parts, respectively;
Fig. 3 is a sectional view of Fig. 1, Fig. 4 is an explanatory diagram of a conventional example, and Fig. 5 is an explanatory diagram of another conventional example.・Main shaft, 12a...M passer, 12X...Main shaft rotation center, 20...Mother moving object,
21. Lever part, 21a... One side, 24...
Spring, 26... Pivot, 30... Quill, 31... Hide, 35... Square body, 35a... Inclined surface, 40... Advance/retreat adjustment mechanism, G... Center of gravity.

Claims (1)

[Claims] A main shaft is supported on a headstock and has a coaxial through hole, and a lever portion integrally protrudes rearward and supported at the tip of this main shaft via a pivot perpendicular to the center of rotation of the main shaft and positioned within the through hole. a quill that is integrally provided so as to protrude forward from the oscillator and has a cutting tool at its distal end that protrudes in a radial direction perpendicular to the pivot; and a quill that is supported in the through hole so as to be pivotable and that is rotatable in the lever portion. a wedge body having an inclined surface that engages with a tip of one side; and by moving the wedge body forward and backward to engage the tip of the one side and the inclined surface, the swinging body and the quill are swung around the pivot. In a boring machine equipped with a forward/backward adjusting mechanism, the center of gravity of the lever section is shifted toward the one side surface by scraping the flesh on the side opposite to the one side surface of the lever section, and the center of gravity position of the lever section is shifted toward the one side surface side. A boring device characterized in that a spring is provided which is always positioned on the side of the one side from the center of rotation of the main spindle throughout the entire swing range and further presses the tip of the one side of the lever part against the inclined surface.