JPS6348324Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a cutting tool that can quickly and accurately fine-tune the position of a cutting edge in two-dimensional directions.

[Conventional technology and its problems]

When finishing boring a workpiece, machining errors such as hole diameter, hole depth from the reference surface, and even hole pitch are often strictly controlled.
When performing such precision hole machining, a cutting tool that can finely adjust the cutting length and the cutting radial position of the cutting blade is required.

A conventional cutting tool with such a function consists of fitting and inserting an eccentric sleeve with the center of the hole into the center hole of a graduated tube body, and then screwing an adjustment nut into the eccentric hole of this sleeve. There is a method disclosed in Japanese Utility Model Publication No. 52-51356 in which the tool holder is biased backwards with a spring and an adjustment nut is locked and inserted into the end surface of the eccentric sleeve, and a uniaxial direction adjustment unit is inserted with a leaf spring. A known example is one described in Japanese Utility Model Publication No. 56-38706, which uses a slide mechanism provided with a wedge to make slight movements in the longitudinal direction of cutting.

[Problem that the invention attempts to solve]

However, with the former tool, the eccentric sleeve that changes the longitudinal cutting position of the cutting blade and the adjustment nut that changes the cutting radial position interfere with each other, and a large frictional force is generated by the spring force on the contact surface between the two. , there is a drawback that when either one is rotated, the other rotates together and the pre-adjusted cutting radius or cutting longitudinal dimension is disturbed. This drawback can be compensated to some extent by fixing one adjustment component with a spanner or the like while rotating the other adjustment component, but this does not provide excellent workability and is not sufficient to overcome the above-mentioned drawbacks.

On the other hand, since the latter tool uses a wedge to make fine adjustments in the longitudinal direction of cutting, it is difficult to display a dimensional scale that shows the amount of lateral movement of the adjustment unit, and the return force of the adjustment unit is likely to be insufficient with a leaf spring. There is also the problem of.

In addition, Utility Model Application No. 59-100506 discloses that an eccentric sleeve is screwed to the main body and an adjusting nut is screwed to the spindle to prevent the sleeve and nut from rotating together, but this tool holder When adjusting the position of the blade edge, each set screw must be loosened at one end and then tightened again after adjustment, which increases the working time.

[Means for solving problems]

The present invention provides a two-dimensional direction fine adjustment type cutting tool that eliminates the above-mentioned drawbacks, and its features are as follows:
The spindle is inserted into the through hole of the main body in a non-rotating manner, and two cutting blade position adjusting parts, which are fitted onto the spindle and have one end surface engaged with the main body, are biased in opposite directions using elastic bodies. Variable pressure terminals are arranged separately at one end and the other end of the through hole, and further, variable pressure terminals are inserted through the circumferential elongated holes provided in the eccentric sleeve to elastically press the spindle and the eccentric sleeve in the radial direction. It is located on the main body.

In other words, the adjustment part provided in the tool body is installed as a through hole, and one end of the hole is provided with a cutting blade position adjustment nut in the first axis direction, and the other end is provided with a nut for adjusting the position in the second axis perpendicular to the first axis. 1 eccentric sleeve for position adjustment each
By arranging the set of elastic bodies in pressure contact with the main body to avoid rotational interference between the two, when one of the parts is rotated, the other part does not rotate together, and accurate adjustment becomes possible.

In addition, the amount of movement of the cutting blade can be displayed on the end face of the adjustment component in both directions with a scale that is compared with the scale on the main body, making it easier to read.

Furthermore, the second axial position of the cutting blade is adjusted by a cranking motion of the spindle by rotation of the eccentric sleeve, while the first axial position of the cutting blade is adjusted by rotation of an adjusting nut, one end of which is supported in the body. Since this is adjusted by the restoring force of the elastic body, the problem of incomplete return of the cutting edge, etc., is also solved.

In addition, the variable pressure terminal presses the spindle against the hole surface of the eccentric sleeve and the eccentric sleeve against the hole surface of the main body to prevent rattling of these parts, but this terminal applies elastic pressure. Therefore, both the adjustment nut and the eccentric sleeve can be easily rotated by applying a force that exceeds the pressing force of the terminal, which eliminates the need to operate the set screw required in Utility Model Application No. 59-100506, making the work much easier. be expedited.

〔Example〕

An embodiment of the cutting tool of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 shown in FIG.
is inserted closely from the rear part, and the hole 1 of this sleeve is
1, a spindle 20 is inserted from the front.

The spindle 20 has a cutting blade 21 attached to its head, and further includes a large-diameter screw portion 22 on the back of the head into which an adjustment nut 30 is screwed, a cylindrical portion 23 that tightly fits inside the hole 11 of the eccentric sleeve, and a variable attachment. A small-diameter screw portion 24 to which the seat plate 41 of the force means 40 is screwed is formed in sequence, and a drive pin 25 protruding from the rear surface of the large-diameter screw portion 22 is formed in a radial guide groove on the front surface of the main body. 3 and is inserted and engaged to prevent rotation.

In addition, the eccentric sleeve 10 has the center of the hole 11 and the center of the outer circumferential surface 12 slightly shifted in the radial direction, and a collar 13 and an operating part 14 that engage with the main body are formed in the rear part thereof, and further, A stepped portion 15 is formed in the middle of the hole 11, which has a hole somewhat larger in diameter than the small diameter portion of the spindle. In addition, as shown in FIG. 3, the edge of the flange 13 has a reference scale 4
A dimension scale 16 is attached to indicate the amount of movement of the cutting blade in the cutting radial direction.

On the other hand, the adjustment nut 30 is attached with its rear surface in close contact with the front surface of the main body in order to apply an axial thrust to the spindle 20, and by rotating the adjustment nut 30, the drive pin 25 can be rotated to the extent that the drive pin 25 does not escape from the groove 3. The longitudinal position of the cutting blade is adjusted. As shown in FIG. 2, the front face of this nut is also provided with a dimension scale 31 for measuring the amount of movement of the cutting blade in comparison with a reference surface marking 5 attached to the front face of the main body.

Next, at the rear part of the eccentric sleeve 10, there is a seat plate 41 screwed into the small diameter screw part 24 of the spindle, and a stepped part 1 of the sleeve that is prevented from rotating by the spindle.
A biasing means 40 with an adjustable set load is incorporated, which is comprised of a spacer 42 in contact with the rear surface of 5, and a disc spring 43 compressed between the two. The force of the disc spring biases the eccentric sleeve 10 and the adjusting nut 30 via the spindle in opposite directions, so that the collar 13 of the sleeve 10 is biased toward the main body, while the rear surface of the nut 30 is biased toward the main body. Rotational resistance is applied to the press-contact portion to prevent backlash, etc., and rattling between the two and the spindle is also prevented.

Note that even if the cylindrical fitting parts of the main body 1 and the eccentric sleeve 10 and this sleeve and the spindle 20 are machined with the accuracy called "current fitting", there will be minute clearances that may cause backlash, etc. For tools, in order to achieve high precision machining,
As shown in the figure, a variable pressure terminal 50 consisting of an adjusting screw 51, a disc spring 52, and a contact 53 is attached to the main body 1, and the contact 53 is passed through a circumferential elongated hole 17 provided in the eccentric sleeve 10 to connect the spindle 20. and the eccentric sleeve 10 therethrough, and axially extending flat surfaces 26 and 18 are formed on the outer periphery of the spindle and the sleeve, so that these parts are pressed against the outer periphery on the opposite side of the urging point. 2 points of contact,
Although the clearance of the cylindrical fitting portion increases the effect of preventing rattling and rotation of the sleeve 20 other than during operation (particularly return after operation), the purpose of the present invention can be achieved even if the flat surfaces 26 and 18 are omitted. The same applies when the O-ring for preventing dust intrusion, which is fitted onto the spindle and the sleeve, is omitted.

The cutting tool configured as above has an eccentric sleeve 1
When the adjusting nut 30 is rotated, the spindle 20 makes a crank motion and moves slightly in the direction of the A axis in FIG. 1, changing the cutting radial position of the cutting blade. The position of the cutting blade in the longitudinal cutting direction changes by slight movement in the direction. Further, during fine adjustment in either direction A or B, the adjustment parts do not rotate together. That is, since the sleeve 10 and the nut 30 are separately engaged with the spindle which is prevented from rotating, rotational force of one is not transmitted to the other, and mutual rotation is prevented. Further, since it is not necessary to rotate the adjusting screw 51 during the rotation operations of 10 and 30, workability is improved.

Note that the through hole of the main body may be oriented in the cutting radial direction, and in this case, the cutting edge changes its position in the cutting longitudinal direction by rotating the sleeve 10, and changes its position in the cutting radial direction by operating the nut 30. It will change.

〔effect〕

As explained above, in the cutting tool of the present invention, the eccentric sleeve and the adjustment nut are arranged at one end and the other end of the through hole of the main body, and are externally engaged with the spindle which is prevented from rotating. Since the co-rotation of the two is eliminated, the cutting edge position can be adjusted quickly and accurately.

Further, since the eccentric sleeve and the adjusting nut rotate in fixed positions, it is easy to attach a scale to indicate the amount of movement of the cutting blade.

Furthermore, since the strong load of the biasing means acts on the spindle, eccentric sleeve, and adjustment nut, it prevents rattling of each part, buckling of the adjustment nut, return phenomenon of the eccentric sleeve, incomplete return of the cutting edge, etc. be done. In particular, the variable pressure terminal presses the eccentric sleeve and spindle in the radial direction, which is highly effective.Moreover, the adjustment nut and eccentric sleeve can be rotated without the need for any other incidental work. According to the tool of the present invention, high-precision finish boring can be carried out with good reliability and good workability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of the fine adjustment type cutting tool of the present invention, Fig. 2 is a partially cutaway plan view thereof, and Fig. 3
The figure is a rear view, and FIG. 4 is a sectional view taken along the line X--X in FIG. 1. 1...Body, 2...Through hole, 3...Guide groove,
10... Eccentric sleeve, 13... Tsuba, 14... Operation section, 15... Step portion, 20... Spindle, 21
... Cutting blade, 22 ... Large diameter screw part, 23 ... Cylindrical part, 24 ... Small diameter screw part, 25 ... Drive pin, 30 ... Adjustment nut, 40 ... Biasing means, 5
0...Variable pressure terminal.

Claims (1)

[Scope of utility model registration request] A spindle having a cutting blade on the head, a first axial adjustment nut of the cutting blade that is screwed into the first threaded part of the spindle, and a first axial adjustment nut of the cutting blade that is fitted onto the cylindrical part of the spindle and tightly inserted into a hole in the main body. In a cutting tool equipped with an eccentric sleeve for adjustment in two axial directions, the hole in the main body is a through hole, the adjustment nut is attached to one end of the hole, the eccentric sleeve is attached to the other end, and the second screw of the spindle is attached to the hole. A pair of elastic bodies compressed and interposed between the seat plate screwed into the part and the small diameter part of the inner surface of the eccentric sleeve are applied in opposite directions, and the reaction force is supported by the main body. The spindle is prevented from rotating by engaging a drive pin protruding from the rear surface of the first threaded portion with a second axial guide groove provided on the end surface of the main body, and a circumferential elongated hole provided in the eccentric sleeve. The main body is provided with a variable pressure terminal that elastically presses the spindle and the eccentric sleeve via it in the radial direction, and presses the spindle against the hole surface of the eccentric sleeve and the eccentric sleeve against the hole surface of the main body. A cutting tool with two-dimensional direction fine adjustment.