JPS6274514A - Boring machine - Google Patents

Abstract

PURPOSE:To enable the processing of two kinds of a workpiece having a different boring diameter by providing a rotary position deciding device for positioning tools at three angles in a spindle and an eccentric tool axis, and arranging primary and secondary cutting tools with the positions and angles thereof shifted from each other. CONSTITUTION:For a workpiece 90, a tool axis body 34 is set and the distributor 61 of a rotary position deciding device 60 feeds oil to a cylinder 11 and the linear motion of a lot bar 65 changes to rotary motion, thereby starting the rotation of a tool axis. And primary and secondary cutting tools 40 and 50 are positioned with the feed of oil stopped on a single due to the contact of the convex of the axis 30 with a stopper and a dog 695 with a limit switch 682 respectively. Thereafter, boring diameter R40L and R50L are processed and after the finish thereof, oil feeding is reversed and the lot bar 65 is shifted to the left side. Then, switches 683 and 684 are turned 'ON', oil feeding is stopped and the axis 30 is set to a neutral position, thereby enabling the removal of cutting tools 40, 50 and 70 from the workpiece 90 without interference with processed bores. Then, when a workpiece having a bore of different diameter is delivered R40R and R50R are similary processed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a boring device that simultaneously processes at least two holes using at least two cutting tools.

[Prior art] A plurality of cutting tools are arranged in a row on a tool shaft, and the tool shaft is attached to the main shaft so that it can rotate around a center line that is parallel to and eccentric to the main shaft. By positioning the tool at two angular positions, one position is the furthest from the center line of the spindle, i.e. at the machining U, and the other is closest to the center line of the manual. Boring devices that position the cutting edge of a cutting tool at a relief position are already known.

[Problems to be Solved by the Invention] The above-described boring device can only position the cutting tool in one processing device, and therefore can only process one type of workpiece. It is easy to think of positioning the tool at two processing positions so that two types of workpieces can be processed, and calling the tool's relief position halfway between the two processing positions, but all tools rotate at the same fixed angle. Therefore, even if one of the bits can be placed in two positions where the two desired machining diameters can be obtained, the other bit will not be able to obtain the two desired machining diameters.
There was a problem with not being able to get to the second position. Therefore, it has at least two bytes, and these bytes contain at least two
In the boring machine Vi setting where two holes are machined at the same time, 2
There was a problem that it was not possible to process rod workpieces.

[Means for Solving the Problems] The boring device of the present invention includes a main shaft, a bearing body supporting the main shaft, and a bearing body that is parallel to the main shaft within the main shaft and whose rotation center is away from the rotation center of the main shaft. At an intermediate position between a tool shaft that is eccentric by a certain distance and rotatably held within a certain rotation angle, and one rotation end and the other rotation end where the tool shaft is restricted from rotating with respect to the main shaft, The periphery of the tool shaft is arranged so that the distance between the rotation center of the main shaft and each cutting edge is smaller than the distance between the rotation center of the main shaft and each cutting edge at the one rotation end and the lumbosacral rotation end. a first cutting tool held at the part, a second cutting tool shifted by a certain rotation angle from the first tooling tool, and provided between the main shaft and the tool shaft, the tool shaft being rotated relative to the main shaft, a rotary positioning device that positions the tool shaft at the first rotation end and the lumbosacral rotation end, and positions the tool shaft in the middle, the tool shaft being positioned at the one rotation end with respect to the main shaft; Position it, perform a boring job with the first bit and the second bit, position the end at the rotation end of the lumbosacral part, and make the first bit 1-1.
The second cutting tool is used to perform a boring process on the piece, and the intermediate position is set as a neutral position.

The boring machine of the present invention includes a main shaft, a bearing body, a tool shaft, a first cutting tool, a second cutting tool, and a rotational positioning device.

The main shaft is a member that transmits rotational force input from a drive source such as a motor to the tool shaft. The bearing body is a member that rotatably supports this main shaft. Conventional equipment can be used as is for the main shaft and bearing body.

The tool shaft is mounted within this main shaft, and is held rotatably within a certain angle with its center of rotation being eccentric by a certain distance from the center of rotation of this main shaft. This is a member that holds the first cutting tool and the second cutting tool on its peripheral edge.

Here, the constant angle is smaller than 360 degrees, preferably 18 degrees.
It is about 0 degrees to 270 degrees. Then, the relative rotation is controlled by a rotational positioning device which will be described later.

The first and second cutting tools are members that are held at the peripheral edge of the tool shaft directly or via a pie holder, shifted at a constant rotation angle, and are used to cut and bore the bamboo material. The first bis 1- is a member that is held on the two shafts at each of the rotation ends described above so that the distance from the center of rotation of the main shaft to the cutting edge is at least 4 mm.

Further, the second pies 1 to 1 are members held on the tool shaft so that the distance from the rotation axis of the main shaft to the cutting edge thereof does not become the minimum at each rotation end.

Rotary positioning device 6 is a device that rotates the tool shaft relative to the main shaft, positions the tool shaft at each end of rotation, and positions the tool shaft at an intermediate IQ within this rotation range. This machine J1 axis can be rotated by, for example, the rotational force of a stepping motor, the electromagnetic force of a solenoid, or the rotational force from a rotating cylinder, but both ends of it are biased with a constant biasing force. Preferably, the fluid pressure that is available is used. As a means for positioning these two ends, for example, positioning using a stopper like III bR can be used.

1 Action] Tool axis (within this main axis, each rotation center is parallel, and the tool axis is held eccentrically with respect to the main axis so as to be rotatable within a certain angle range.

The main sleeve 1 is rotatably supported by the bearing body. The tool shaft is maintained at its periphery by shifting a first bit and a second bit by a constant rotation angle. In the initial state, the tool axis is set at a neutral position within a range that allows ρ1 rotation. In this state, the tool axis moves relative to the pilot hole of the workpiece to be machined and is set at a predetermined machining position in the pilot hole. The rotary positioning device positions the first and second cutting tools at a predetermined end l' so that the cutting edge A is not at a minimum distance from the rotation center of the spindle.

When the main shaft is driven and rotated, the tool shaft held by the main shaft also begins to rotate, and the workpiece is corner-bored by the first and second cutting tools. When the predetermined machining is completed, the tool shaft is intermediately positioned, and the tool shaft is removed from the workpiece. When different types of workpieces come in, the toolshaft is inserted into the prepared hole of the workpiece with the toolshaft in an intermediate position.
The first and second cutting tools are positioned at the other end so that their cutting edges are not at a minimum distance from the center of rotation of the spindle, and boring is performed. When the machining by the first and second bits is completed, the rotary positioning device intermediately positions the L tool shaft.

In this state, the worker shaft and the workpiece move relative to each other, and the tool shaft is taken out of the workpiece. At this time, the first and second cutting tools are located at a relatively short distance from the rotation center of the main shaft. Therefore, the first cutting tool and the second pie 1- can be taken out from the machined hole of the workpiece without contacting the inner peripheral part of the machined hole of the workpiece.

[Example] Hereinafter, the boring apparatus of the present invention will be explained in detail based on a specific example. As shown in the cross-sectional views of FIGS. 1 and 2, this boring device has a main shaft 10,
It is composed of a bearing body 20, a tool shaft 30, a first cutting tool 40, a second cutting tool 5o, and a rotational positioning device 60.

The bearing body 20 is composed of a base 21 and five rolling bearings 22 to 26 coaxially provided in four through holes of the base 21. The main shaft 10 is provided with an n through hole in the center, and has hollow parts 11, 12, 13 communicated through the n through hole, and a pulley 16 fixed with a key 15 on the outer periphery.
have.

This pulley 16 receives the rotational force of a motor 80 for rotating the main shaft via a V-belt 81, and rotates the main shaft 10.

The tool shaft 30 includes a tool shaft base 33 whose both ends are supported by rolling bearings, a first bite 40 and a second bite 5, which will be described later.
0, and as shown in FIG. 2, a tool shaft body 34 is connected to the tool shaft base 33 with bolts 330 and knock pins 331.

The first cutting tool 40 and the second cutting tool 5o are connected to this tool shaft body 3.
4, as shown in the cross-sectional view of FIG.
The second bit 50 protrudes more in the radial direction than the first bit 40. Also, the tool shaft body 34
In addition to the first cutting tool 40 and the second cutting tool 50, a plurality of cutting tools 70 are provided for processing different parts from the cutting tools 40 and 50.

The first cutting tool 40 and the second cutting tool 50 can be used in this machining mode according to the first mode in which both the cutting tools are not machined, the second mode in which the respective cutting tools simultaneously machine at the respective positioning ends, and the third mode in which the respective cutting tools work simultaneously. Process object 90.

The rotational positioning 'AA device 0 that sets this mode will be described later, but when the [-] mode of these three examples is set, the tip of the tool when viewed from the tip direction 36F of the tool shaft body 34 is drawn. The size of each machining diameter will be explained using FIG. 3.

As shown in FIG. 9, the tool shaft body 34 holding the first cutting tool/'IO and the second cutting tool 50 is inserted into the pilot hole in the same state as the rotation center P10 of the spindle 10 and the center of the pilot hole of the workpiece 90. , shows how the end is positioned at one rotation end. The rotation center P30 of this tool +1134 is eccentric from the rotation center P10 of the main shaft 10 by a distance t]D.

The distances between the tip of each cutting tool and the center of rotation [ ] 30 are R40 and R50, respectively. This tool @3
4 is an angle θR10LR10L in the clockwise and counterclockwise directions, respectively, with respect to the straight lines P30 and []10. Also, the first
The deviation angle of the second cutting tool 50 with respect to the cutting tool 40 is θS.

The tool shaft body 34 having such a configuration is rotated counterclockwise, US =
When rotating in the + direction and positioning each end, find the machining diameter of each pie 1~.

As shown in FIG. 3, when the tool shaft main body 34 is positioned at the end in the counterclockwise direction and the main shaft rotates, the first cutting tool 40 and the second cutting tool 50 each have a machining diameter R
According to the well-known formula, R/l OL- = (I-ID' + R402 - 2XHDXR40XCO3 (O1)) 50L = (tID2 + R502 - 2 θS) 1'. When the tool shaft 34 is rotated clockwise and positioned at the end (position indicated by the dashed-dotted line in Fig. 3), the machining diameter R4OR1R50R processed by each tool is 40R. = (I-102+1(40" -2XHDXR40XCO8(θR)) 50R =N-ID2→-R50" -2X I-I D X R50X COS (θR+
θS))". At this time, the first
When calculating the difference in the machining diameter processed by the cutting tool 40, =
2 X l-I D X R40
O8(θ R) −CO8(θ shi ))],
The desired machining diameter can be determined by setting the parameters HD and θR1θL. The same result is obtained for the machining diameter R50 [≧1g] at each end of the second cutting tool 50.

+1Fi angle θR and angle θ1− (,t,
Determined by stopper 308.31S described later,
Unless the device itself changes, it will always remain constant. Angle θF≧
, 01- change depending on the angular position at which the tool shaft body 34 is attached to the tool shaft base 33, and the eccentricity ff1HD also changes depending on the angular position at which the tool shaft body 34 is attached to the tool shaft base 33.

By appropriately determining the angles θR1θL and R40, two types of desired machining diameters R40R and R40L can be obtained. With the angle θR1θL fixed, the angle 1ffO3,11
By appropriately determining 50, two desired machining diameters R50R and R50L can be obtained. This J: Sea urchin No. 1
Even though the rotation angles of the cutting tool 40 and the second cutting tool 50 are the same, a desired machining diameter of 2Fl'AI can be produced for each.

In this embodiment, this angle θR1θL was set so that θL>θR. As shown in FIG. 4, this tool shaft 30 is positioned by stoppers 308 and 313 provided on the main shaft so that the first cutting tool 40 and the second cutting tool 50 can be machined, respectively.

The rotational positioning device 60 rotates the tool shaft body 34 to the time position 1.
This is a device that rotates the main shaft 10 by θR1θL in both directions and counterclockwise, and inputs pressure oil from a hydraulic system (flash) to rotate the main shaft 10.
A disc 1 to a rebi-utaro 1 that supplies pressure oil input to a cavity 11 provided in G'J, and a joint 6 held by a rolling bearing unit 1-62 in this distributor 61.
A rod rod 65 having a piston 64 that is connected to the rotor rod 65 through the rod 3 and operates using the cavity 11 of the main shaft 10 as a cylinder.
and a sleeve 66 which is threadedly engaged with the rod rod 65, eccentric to the center line of this sleeve 66 and threadedly engaged via a helical spline, and whose other end is concentrically connected to the aforementioned tool shaft base 33. It is composed of a relay rod 67 and a setting device 68 for setting the amount of movement of this rod rod 65.

This setting device 68 is a rolling I? A movable plate 691 that moves forward and backward together with the lower 1-rod 65, and a rotation stopper that stops the rotation of this movable plate 691! 69
0, an actuating rod 692 fixed to this movable plate 691,
It consists of dogs 693 to 696 that are inserted into the operating rod 692 and actuate limit switches 681 to 684 depending on the right rotation end, left rotation end, or neutral position.

This dog 694.693 is a member that operates the limit switch 683.684 so that the first cutting tool 40 and the second piezo 1 to 50 are set to the first mode position P S E T . 2 indicates that the tool shaft body 34 has been returned to the neutral position PSE from either the clockwise or counterclockwise direction.
The limit switches 683.684 are the dogs 694.
693, it is detected without false detection.

In the apparatus of this embodiment configured in this manner, the tool shaft body 34 is set at a predetermined position of the workpiece 90 to be bored. Here, pressure oil is supplied from the distributor 61 of the rotary positioning device 60 to the cylinder 11, and the rod rod 65
The backward linear motion of the machine is converted into a four-wheel drive, and the tool shaft 30 begins to rotate.

At this time, the movable plate 691 also moves forward, and the operating lever 69
2 also moves forward. The positioning of the first cutting tool 40° and the second cutting tool 50 is such that the protrusion of the tool shaft 30 is located at the stopper 303.
Dock 695 is limited along with Nitaya (・Switch 682
At this time, the supply of pressure oil to the distributor 61 is stopped in response to that signal. After this, processing is performed in the same manner as in the conventional apparatus, and processing is performed to the above-mentioned processing diameters R40L and R50L. When the predetermined addition is completed, pressure oil is supplied to the distributor 61 in the opposite direction, and the rod rod 65 is sent to the left (arrow 65B), the limit switch 683. 684
is turned on, and the supply of pressure oil to the cylinder 11 is stopped. As a result, the tool axis 3o is set to the neutral position, and as the bearing body 20 retreats, the cutting tool 40, 50, 70 is taken out from the workpiece 90 without interfering with the machined hole.

When a workpiece of a different type from the workpiece 90 comes flowing and is positioned at a position corresponding to the bearing body 20, the bearing body 20 moves forward and the tool shaft 30 is inserted into the pilot hole of the workpiece. Pressure oil is supplied to the cylinder 11 again, and the tool shaft 30 is rotated by the helical spline. When the protrusion of the tool shaft 3o hits the stopper 31, the rotation of the tool shaft 30 is stopped, and the supply of pressure oil to the cylinder 11 is stopped in response to a signal from the dog 696 that turns on the limit switch 681.

In this state, the main shaft 1o is rotated by the motor 80, and the first cutting tool 40 and the second cutting tool 50 perform machining. %R40R
, R50R is processed. After the machining is completed, the tool axis 30 is set to the neutral position, and each bite is taken out from the workpiece without interfering with the prepared hole.

[Effects of the Invention] As described above, the present invention has the following advantages: the tool shaft is mounted on the main spindle so that it can rotate between the center lines that are parallel to the center line of the main spindle and are eccentric; A rotary positioning device that positions the tool at three angular positions is provided, and the first and second tools are provided axially and at different angles on the tool axis. Despite the rotation at a constant angle, it is possible to position the first and second bites at positions where two types of desired machining diameters can be obtained, and two holes with different machining diameters can be positioned.
f! The advantage is that it is possible to process similar types of workpieces.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are sectional views showing the configuration of a boring machine according to a specific embodiment of the present invention, respectively. FIG. 3 is an explanatory diagram used to explain how to find the machining diameters to be processed by the first and second cutting tools used in the same embodiment. FIG. 4 is an explanatory diagram showing the relative position of the tool shaft when rotationally positioning it with respect to the main shaft.

Claims (1)

[Claims] (1) A main shaft, a bearing body that supports the main shaft, and a bearing body that is held rotatably within the main shaft, parallel to the main shaft, with the center of rotation being eccentric by a certain distance from the center of rotation of the main shaft, and within a certain rotation angle. At an intermediate position between the tool shaft and one rotation end and the other rotation end where the tool shaft is restricted from rotating with respect to the main shaft, the distance between the rotation center of the main shaft and each cutting edge is equal to or smaller than the one rotation end. a first cutting tool held at the peripheral edge of the tool shaft such that the distance between the center of rotation of the spindle and each cutting edge is smaller than the distance between the rotation center of the main shaft and each cutting edge at the end and the other rotating end; and a constant rotation angle with the first tooling tool. a shifted second cutting tool, which is provided between the main shaft and the tool shaft, rotates the tool shaft relative to the main shaft, and rotates the tool shaft at one end of rotation and the other end of rotation; and a rotary positioning device that positions the tool shaft in the middle, positions the tool shaft at the one rotation end with respect to the main shaft, and performs boring with the first tool bit and the second tool tool. None, a boring process characterized by positioning the end at the other rotating end, performing another boring process using the first bit and the second bit, and setting the intermediate positioned position as a neutral position. Device.