WO2006011562A1

WO2006011562A1 - Positioning mechanism for changed blade of cutting tool

Info

Publication number: WO2006011562A1
Application number: PCT/JP2005/013856
Authority: WO
Inventors: Norio Ogura
Original assignee: Kanefusa Kabushiki Kaisha
Priority date: 2004-07-29
Filing date: 2005-07-28
Publication date: 2006-02-02
Also published as: JP2006035726A

Abstract

A positioning mechanism for a changed blade capable of securely fixing the changed blade at a reference position by preventing the changed blade from being mounted at an incorrect position which may occur when the changed blade of the cutting tool is fixed by a tightening member. In the cutting tool comprising a position reference part for the changed blade on the changed blade mounting face thereof, an elastic body slightly longer than the thickness of the changed blade is inserted into the through hole of the changed blade. Before the changed blade is fixed by inserting the tightening member into the elastic body, the elastic body is deformed by the tightening member, and a part of the elastic member is pressed against the wall surface of the through hole on the position reference side to displace the changed blade to the position reference part by the pressing force of the elastic body.

Description

Specification

Replacement blade positioning mechanism for cutting tools

Technical field

[0001] The present invention relates to a replaceable blade type cutting tool used for cutting of wood, metal, and the like, and more particularly to an improvement of a replaceable blade positioning mechanism provided in the cutting tool. Background art

[0002] As a cutting tool for cutting the wood or the like, there is a replaceable blade type cutting tool that completely replaces a blade with reduced sharpness or wear with a new blade. In this type of replaceable cutting tool, the replaceable blade is positioned and fixed on the mounting surface of the tool, and the fixing mechanism is tightened after the replaceable blade is applied to a predetermined positioning portion. What is fixed with bolts is known.

For example, Patent Document 1 discloses a cutter in which a replacement blade positioning reference pin is provided on a replacement blade mounting surface. Specifically, as shown in FIG. 18, in the replaceable blade holding portion la extending in a radial direction from the cutter 1 at a predetermined central angle, the replaceable blade mounting surface 2 oriented in the rotation direction is provided at a required interval. Two positioning pins 4a (4b) are implanted. Further, the flat surface of the replaceable blade 3 is formed with a V-shaped notch (not shown) that can be fitted in correspondence with each positioning pin 4a (4b) during positioning. Then, after positioning the V-shaped notch of the replaceable blade 3 in contact with the positioning pin 4a (4b) correspondingly, the replaceable blade 3 is placed on the replaceable blade mounting surface 2, and then the tightening bolt 5 Tighten and fix it.

Patent Literature 1: Real Fairness 7-55041

Disclosure of the invention

Problems to be solved by the invention

[0003] According to the cutter described in the above publication, when the blade edge of the replaceable blade 3 is worn and replaced, the following work is required.

(1) Loosen the fastening bolt 5 and remove the replacement blade 3 from the cutter 1.

(2) Adjust with your fingers so that each V-shaped notch of the new replaceable blade 3 fits with each positioning pin 4a (4 b) provided on the replaceable blade mounting surface 2. (3) After confirming that the replaceable blade 3 is fixed on the replaceable blade mounting surface 2, tighten the tightening bolt 5 to fix the replaceable blade 3.

That is, it is necessary to perform the work of fixing with the tightening bolt 5 after aligning on the replacement blade mounting surface 2 while pressing with the fingers so that the replacement blade 2 does not come off. However, since the tightening force of the tightening bolt 5 acts only in the axial direction of the bolt, if the positioning of the replaceable blade 3 is not accurate, the replaceable blade 3 is fixed without being corrected. This will cause poor attachment accuracy.

[0004] In particular, when replacing the replaceable blade 3 with the cutter 1 attached to the cutting device, depending on whether the operator's finger interferes with other parts or is held by the finger, There is a problem that the V-shaped notch of the replaceable blade 3 cannot be securely fitted to the reference pin 4a (4b). Under such a condition, it is difficult to confirm whether or not the replacement blade 3 is positioned accurately, and the present invention is inherent in the replacement blade mounting mechanism of the cutting tool according to the prior art described above. It was proposed to improve this problem, and as the bolts and other fastening members are tightened, a component force is generated to push the replacement blade toward the position reference side. It is an object of the present invention to provide a replaceable blade positioning mechanism that can achieve reliable positioning of a replaceable blade. Means for solving the problem

[0005] A replaceable blade positioning mechanism for a cutting tool according to claim 1 is a cutting tool having a replaceable blade mounting surface and a position reference portion of the replaceable blade provided in a protruding or stepped manner on the replaceable blade mounting surface. The blade comprises a replaceable blade having a through hole and a reference end serving as a reference for mounting, an elastic body inserted into the through hole, and a tightening member for the replaceable blade. The replaceable blade is attached to the replaceable blade with the tightening member. When fixing to the face, the elastic body is compressed in the core direction of the through-hole and expanded or bent in a direction transverse to the core direction so that a part of the elastic body is a position reference portion of the hole wall of the through-hole. The reference end, which serves as a reference for the replaceable blade before the replaceable blade is subjected to the tightening force of the tightening member, is brought into contact with the position reference portion by the contact force generated by the pressure contact of the elastic body. It is characterized by deciding.

[0006] According to the invention of claim 1, when the replaceable blade is fixed to the replaceable blade mounting surface on which the position reference portion is formed by the fastening member, the replaceable blade is inserted into the through-hole provided in the thickness direction of the replaceable blade. Elasticity longer than thickness When the body is inserted and the replacement blade is tightened with the tightening member, the elastic body is compressed in the core direction (thickness direction of the replacement blade) so that the elastic body is positioned laterally with respect to the core direction of the through hole. By inflating or bending the position reference part side and generating a component force in the position reference part direction with respect to the compression direction, the replaceable blade is positioned on the position of the replaceable blade mounting surface before the tightening force is applied. The replacement blade is tightened after being pressed against the position side and bringing the reference end serving as the reference of the replacement blade into pressure contact with the position reference portion with the component force.

The elastic body should be set slightly longer than the thickness of the blade (if it is not necessarily long, it only needs to be pushed in front of the blade). At the time of tightening, the elastic body is tightened and compressed before the replaceable blade and accompanied by deformation such as expansion and bending, thereby generating a component force in the transverse direction with respect to the tightening direction. Press to the side.

[0007] In the replaceable blade positioning mechanism of the cutting tool according to claim 2, the elastic body is a coil spring, and an inclination in a direction in which a seat surface of the replaceable blade mounting surface of the coil spring is lowered toward the position reference portion side or The coil spring is bent so as to protrude toward the position reference portion by tightening with a bolt of a tightening member inserted into the center hole of the coil spring, and the position reference portion side of the hole wall is The pressure contact force is generated by pushing a coil spring between the bolts.

[0008] According to the invention of claim 2, a coil spring slightly longer than the thickness of the replaceable blade is used as the elastic body, and when the coil spring is compressed by tightening, the spring receiver on the replaceable blade mounting surface is used. Since the seating surface is an inclined surface or a step in the direction going down to the position reference part side, the coil spring is bent so that it protrudes to the position reference part side, and the position reference part side of the through-hole inner wall of the replaceable blade and the bolt The coil spring is pushed in between, and the component force in the transverse direction to the tightening direction is generated by the compression force generated by the pushing, and the replacement blade is pressed against the position reference portion.

[0009] In the replaceable blade positioning mechanism of the cutting tool according to the invention of claim 3, the elastic body is a cylindrical coasting material, and the through hole core of the replaceable blade is threaded on the replaceable blade mounting surface when the replaceable blade is mounted. The bolt inserted into the center hole of the cylindrical inertia material at a position slightly displaced in the direction away from the position reference portion with respect to the screw hole core of the bolt of the tightening member Is screwed into the threaded hole of the replacement blade mounting surface through the through hole of the replacement blade and tightened to inflate the cylindrical elastic material laterally with respect to the core direction, and tighten with the position reference portion side of the hole wall. The pressure contact force is generated by filling a coasting material between the attached bolts.

[0010] According to the invention of claim 3, the center of the through hole of the replaceable blade is slightly in a direction away from the position reference portion side with respect to the center of the screw hole of the bolt of the replaceable blade mounting surface in the replaceable blade mounting state. By using a cylindrical elastic material that is somewhat longer than the thickness of the replaceable blade as the elastic body, rubber or elastic resin that is a cylindrical inertia material by the bolt head when the replaceable blade is tightened or The coil spring is compressed and expanded laterally with respect to the tightening direction, and the elastic material is filled in the position reference part side where the gap between the replacement blade through hole and the bolt is narrow. Create a component force. With this lateral component force, the reference end of the replaceable blade before tightening and fixing is brought into pressure contact with the position reference portion for reliable positioning.

[0011] The replaceable blade positioning mechanism of the cutting tool of the invention of claim 4 includes a replaceable blade mounting surface parallel to the diameter line, a position reference portion of the replaceable blade formed at least in the back of the replaceable blade mounting surface, and a replaceable blade There are multiple blade replacement parts on the circumference that combine a back seat that secures the blade to the blade mounting surface, a back seat receiving surface that forms an acute angle with the blade mounting surface, and a tightening bolt that tightens the back seat. In the cutting tool, the replaceable blade is formed with a hole in the thickness direction and a reference end serving as a reference for the position of the blade edge. An elastic body that has a blind hole with a slightly displaced hole core on the side of the position reference portion with respect to the hole core, is inserted into the blind hole, protrudes from the blind hole, and is engaged with the hole of the replacement blade. The portion of the elastic body protruding from the blind hole of the back seat is pushed into the position reference portion side by tightening the tightening bolt. Before the tightening force acts on the blade, the circumference is pressed against the hole wall on the position reference portion side of the hole of the blade, and the part protruding from the back blind hole of the elastic body is bent or left. The replacement blade is positioned by a force that presses the reference end of the replacement blade against the position reference portion.

[0012] According to the invention of claim 4, before tightening the tightening bolt, the reference end at the back of the replaceable blade protrudes from the back seat into the through hole of the replaceable blade in a state where it is on the position reference portion. The back is in contact with the surface of the spare blade and the back seat receiving surface, and the back seat is in contact with the spare blade and back seat by tightening the tightening bolts. It is moved to the valley side with the receiving surface. With this move The tip of the elastic body that fits and protrudes into the bottomed hole of the back seat is bent by the inner wall on the reference side of the center hole of the replaceable blade, and the reference end of the replaceable blade is pressed against the position reference portion by the bending force. After that, the replacement blade is fixed.

The invention's effect

[0013] By configuring as described above, the present invention has the following effects.

[0014] In the invention of claim 1, before the replacement blade is fixed by the tightening bolt, the elastic body is compressed by the tightening action of the tightening bolt so that the replacement blade is transverse to the tightening direction. The elastic body can be expanded or bent in the direction of the blade position reference portion, and the replacement blade can be brought into pressure contact with the position reference portion naturally. Therefore, even if the replacement blade pressed by the finger is slightly deviated from the reference position, it is fixed at the correct position and the machining accuracy can be maintained. This is especially effective when the replacement state is unstable when the cutting tool is attached to the cutting device.

[0015] In the invention of claim 2, since the seat surface of the coil spring formed on the replacement blade mounting surface has an inclination or a step in a direction to go down to the position reference portion side, the coil spring is compressed by a tightening bolt. Bending toward the position reference side creates a component force toward the position reference side in the lateral direction with respect to the tightening direction, and the reference end of the replaceable blade that is not securely positioned is used as the position reference part. It can be pressed and can be installed accurately even when replacing in places where the replacement blade replacement location is unstable and difficult to work.

Even when the replacement blade is not properly in contact with the position reference portion, the replacement blade is accurately pressed and positioned to the position reference portion before fixing the replacement blade, so that the machining can be performed with high accuracy and the mounting time can be shortened.

In addition, by selecting the length and strength of the coil spring and the inclination angle of the spring seating surface, the optimum pressure contact force can be obtained depending on the degree of bending, and a more reliable result can be obtained.

[0016] The invention of claim 3 selects the hardness of the cylindrical inertia material, the amount of displacement between the center of the through hole of the replacement blade and the center of the bolt screw hole of the mounting surface, that is, the reference portion of the bolt and the replacement blade By selecting the size of the gap with the inner wall of the through hole on the side, the optimum compression force can be generated, and the press-contact positioning of the replacement blade can be performed with certainty.

[0017] According to the invention of claim 4, the replacement blade mounting surface, that is, the surface of the replacement blade and the back seat receiving surface form an acute angle, and the back seat is pushed toward the valley side with a tightening bolt. Coil spring, Or, the elastic grease is bent in the direction of the position reference part and the force of pressing the replacement blade by the elastic force, and the wedge force acting on the back seat, that is, the position reference part side, acts on the back surface of the replacement blade. However, the friction causes a force in the direction of pulling the replacement blade together with the back seat to the position reference portion side, so that the reference end serving as the reference of the replacement blade can be more reliably pressed to the position reference portion side.

In addition, by selecting the amount of deviation between the center of the bottomed hole of the back seat and the center of the through hole of the spare blade, the amount of bending of the coil spring or elastic resin is brought to an optimum state. This comes out.

Brief Description of Drawings

FIG. 1 is a front view of a cutting tool provided with a replaceable blade positioning mechanism according to a first embodiment of the present invention.

FIG. 2 is a right side view of the cutting tool shown in FIG.

FIG. 3 is a sectional view taken along line III-III of the cutting tool shown in FIG.

FIG. 4 is an enlarged sectional view of a part surrounded by a two-dot chain line circle in the replaceable blade positioning mechanism shown in FIG.

FIG. 5 is a partially enlarged cross-sectional view similar to FIG. 4, showing a state in which the replaceable blade is removed.

FIG. 6 is a front view showing the cutting tool shown in FIG. 1 in a state where the positions of the screw hole portion and the replacement blade through hole are changed.

7 is a replaceable blade positioning mechanism according to a second embodiment of the present invention, and is a sectional view taken along line VII-VII of the cutting tool shown in FIG.

FIG. 8 is an enlarged sectional view of a part surrounded by a two-dot chain line circle in the replaceable blade positioning mechanism shown in FIG.

FIG. 9 is an enlarged cross-sectional view similar to FIG. 8, showing a state where the replaceable blade is removed.

FIG. 10 is a side view of a replaceable blade positioning mechanism according to a third embodiment of the present invention, and is an explanatory view showing the position reference disc removed.

FIG. 11 is a plan view of the replaceable blade accommodating portion shown in FIG.

FIG. 12 is a view taken along line XII-XII in FIG.

FIG. 13 is an enlarged cross-sectional view of a portion surrounded by a two-dot chain line circle in the replaceable blade positioning mechanism shown in FIG. 14 is an enlarged view showing a modification of the replaceable blade mounting portion shown in FIG.

15 is an enlarged view showing still another modification of the replaceable blade mounting portion shown in FIG.

FIG. 16 is an enlarged view showing still another modified example of the replaceable blade mounting portion shown in FIG.

FIG. 17 is a front view of a coil spring used in the replaceable blade mounting portion of FIG.

FIG. 18 is a front view of a cutting tool according to the prior art.

BEST MODE FOR CARRYING OUT THE INVENTION

A preferred embodiment of the present invention is a replaceable blade type rotary tool (cutter), which will be described below with reference to the accompanying drawings.

Example 1

FIGS. 1 to 5 show a replaceable blade positioning mechanism according to a first embodiment of the present invention. FIG. 1 is a front view of a replaceable blade type cutter 10 used for, for example, a wood force gauge. FIG. 2 is a right side view of the cutter 10. 3 is a cross-sectional view taken along line III-III in FIG. 1, and FIG. 4 is an enlarged view of a portion surrounded by a two-dot chain line in FIG.

1 and 3, the replaceable blade type cutter 10 includes a straight shank 10a and a large diameter replaceable blade mounting portion 10b provided integrally with the shank 1Oa in the axial direction. In the replaceable blade mounting portion 10b, a replaceable blade mounting surface 12 is formed in a step shape at a bisecting position in the circumferential direction. Depending on the size of the cutter 10 and the work application, the replacement blade mounting surface 12 may be formed at a three-quarter position or a quadrant position in the circumferential direction. Further, the replacement blade mounting surface 12 may be formed at an evenly divided position as long as the rotation balance is maintained as the cutter 10 which is not required to be formed at an equally divided position.

As shown in FIG. 1, the replaceable blade mounting portion 10b is formed by cutting the tip side force in a step shape over a length of about 3 Z4 toward the shank 10a side. The replaceable blade mounting portion 10b includes a replaceable blade mounting surface 12 that forms a wall surface parallel to the tool axis of the cutter 10 as shown in FIG. 2, and a wall surface that is parallel to the tool axis and perpendicular to the replaceable blade mounting surface 12. 14 and power. As shown in the enlarged view of FIG. 4, the base portion of the wall surface 14 is formed with a step force slightly wider than the thickness of the replaceable blade 16 as a position reference surface 18 for the replaceable blade 16. That is, the position reference surface 18 is provided on the replacement blade mounting surface 12 so as to protrude or be stepped, and defines the position where the cutting edge 16 a of the replacement blade 16 extends from the cutter 10. Also, as shown in Fig. 1, a wall 22 is cut at the end of the blade mounting surface 12 on the side of the shank 10a, with a land 20 forming a coneide shape (mountain shape) perpendicular to the axis. This function as the reference surface 24 for the lateral position of the replaceable blade 16 in the tool axis direction. However, the position reference plane 24 is not involved in the cutting diameter of the cutter 10 and may be omitted depending on circumstances.

As shown in FIGS. 1 and 4, the replaceable blade 16 is fixed to the replaceable blade mounting surface 12 with fastening bolts 28 at two locations that are displaced toward the position reference surface 18 and separated in the axial direction. Screw holes 26, 26 are provided for screwing. In this embodiment, the replacement blade mounting space is formed to be point-symmetric with the tool axis as shown in FIG. The replaceable blade 16 is a flat plate having a required thickness made of, for example, tool steel or cemented carbide, and is set to a size such that the cutting edge 16a slightly protrudes in the radial direction from the replaceable blade mounting surface 12 of the cutter 10. ing. The replacement blade 16 is provided with through holes 30 and 30 through which the fastening bolts 28 are inserted, corresponding to the screw holes 26 and 26 of the replacement blade 16. As shown in FIG. 4, the replaceable blade 16 removes the central portion of the replaceable blade 16 (on the side opposite to the blade edge 16a) to make two protrusions at both ends, and the protrusions of the cutter 10 By contacting the position reference surface 18 with the position reference surface 18, the replacement blade 16 functions as a reference end 32 for positioning the replacement blade 16 at a fixed position on the replacement blade mounting surface 12.

Further, as shown in FIG. 1, the end face of the replaceable blade 16 that abuts on the side position reference surface 24 that forms the top surface of the cone-shaped peak is caused to function as the side reference end 36. The cutting edge 16a that is the outer diameter cutting edge of the replaceable blade 16 cuts the workpiece with a predetermined cutting diameter when the reference end 32 of the replaceable blade 16 is brought into contact with the position reference surface 18 of the cutter 10. It is set to the protruding dimension to get.

As shown in FIG. 4, the inner diameters of the through holes 30 and 30 formed in the replacement blade 16 are set to dimensions that allow the compression coil spring 38 to be inserted. The axial length of the coil spring 38 in the free state is set to be larger than the thickness of the replaceable blade 16, and the fastening bolt 28 is passed through the hollow portion of the coil spring 38. A spring seat 40 is recessed in the replaceable blade mounting surface 12 of the cutter 10 so that the lower end of the coil spring 38 can be accommodated and seated on the spring seat 40. The seat surface of the spring seat 40 is, for example, 45 ° with respect to the position reference surface 18 parallel to the tool axis and the lateral position reference surface 24 (FIG. 1) of the Conide-type peak surface perpendicular to the tool axis. It has a downward slope (down slope). However, the seat surface of the spring seat 40 is inclined. It is good also as a mere level difference. In the case where it is not necessary to strictly control the entering and exit of the replaceable blade 16 in the tool axis direction, the downward inclination of the seating surface is directed toward the position reference surface 18 as shown in FIG. Note that two reference pins (not shown) may be provided on the position reference plane 18 and these pins may be used as the position reference portion. The reference edge of the replaceable blade 16 corresponding to such a position reference portion is preferably formed in a notch shape or a concave shape.

[0025] The actual use of the replaceable blade positioning mechanism configured as described above will be described below.

First, the required replacement blade 16 is placed on the replacement blade mounting surface 12 of the cutter 10. In this case, it is not necessary to be positioned accurately. Next, each of the coil springs 38 described above is inserted correspondingly into the through hole 30 of the replaceable blade 16. At this time, each coil spring 38 enters correspondingly to the spring seat 40 recessed in the replaceable blade mounting surface 12, and the lower end surface of the spring comes into contact with a shallow portion of the spring seat 40. However, since the axial length of the coil spring 38 is set larger than the thickness of the replaceable blade 16 as described above, the upper surface force of the replaceable blade 16 also protrudes from the upper portion of the coil spring 38. Under this state, the fastening bolt 28 is inserted into the hollow portion of the coil spring 38 and screwed into the screw hole 26 screwed into the replacement blade mounting surface 12. As the tightening bolt 28 is tightened, the coil spring 38 is compressed, and the lower end surface of the spring gradually expands from the one-sided contact state with respect to the seating surface of the spring seat 40, and finally the entire lower end of the spring is inclined by the spring seat 40. Will hit the seat. In this state, the coil spring 38 is bent and deflected in the direction of 45 ° on the position reference side.

FIG. 5 shows a state in which the replaceable blade 16 is removed and the tightening bolt 28 is tightened, and the bent state of the coil spring 38 described above can be confirmed. That is, the coil spring 38 is restricted upward by the head of the tightening bolt 3 in the bent state. When the coil spring 38 is bent, a compressive component force is generated in the transverse direction substantially perpendicular to the bending direction, that is, the tightening direction. By this component force, the replaceable blade 16 before being fixed is biased in the direction of the center line 45 degrees of the axis-side position reference surface 18 and the side position reference surface 24, and as shown in FIG. The reference ends 32 and 32 are in pressure contact with the position reference surface 18 of the replaceable blade mounting surface 12, and the other side reference surface 36 is in pressure contact with the side position reference surface 24 of the replaceable blade mounting surface 12 as shown in FIG. When further tightened in this state, the head of the tightening bolt 28 comes into contact with the upper surface of the replaceable blade 16 and fixes the replaceable blade 16 to the replaceable blade mounting surface 12. Therefore, when the replaceable blade 16 is placed on the mounting surface 12, the replaceable blade 16 Even if there is a slight gap with respect to the position reference surface 18 and the side position reference surface 24, as the tightening bolt 28 is tightened, the position is corrected and accurate fixing is achieved.

Example 2

FIGS. 6 to 9 show a replaceable blade positioning mechanism according to a second embodiment of the present invention. The same members as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

[0029] As shown in the enlarged sectional view of FIG. 8, the inner diameter of the bolt through hole 30 formed in the replaceable blade 16 is set to a dimension that allows a hollow cylindrical rubber 39 functioning as an elastic body to be loosely inserted. . As shown in FIG. 6, the center of the through-hole 30 is the same as the position reference surface 18 on the tool axis side and the side position reference surface 24 on the top of the coneyde peak with respect to the screw hole 26 of the replacement blade mounting surface 12. In the direction of the center line of the angle (45 degrees with respect to the tool axis), they are biased away from these two position reference planes 18, 24. Then, the gap on the reference surface side between the tightening bolt 28 and the through hole 30 is made smaller than the gap on the opposite side, so that the cylindrical rubber 39 slides into this small gap. The length of the cylindrical rubber 39 is slightly larger than the thickness of the replaceable blade 16 so that a part of the cylindrical rubber 39 can project the upper surface force of the replaceable blade 16. Therefore, when the tightening bolt 28 is tightened, the cylindrical rubber 39 is compressed as shown in FIG.

[0030] Next, the procedure for mounting the replaceable blade in the second embodiment will be described.

[0031] A replaceable blade 16 having a cylindrical rubber 39 inserted into each through hole 30 is placed on the replaceable blade mounting surface 12, and the reference end 32 of the replaceable blade 16 is placed on the tool axis side as shown in FIG. As shown in FIG. 6, the side reference end 36 of the replaceable blade 16 is brought into contact with the position reference surface 24 forming the top of the cone-shaped peak. Then, after inserting the tightening bolt 28 into the cylindrical rubber 39, when the tightening bolt 28 is tightened, the cylindrical rubber 39 is compressed in the axial direction by the head of the bolt 28, and as shown in FIG. Swells laterally. At this time, the gap between the fastening bolt 28 and the inner wall on the position reference surface side of the through hole 30 is set to be smaller than the gap on the opposite side so that the cylindrical rubber 39 slides in. As a result, the gap is filled with rubber and a transverse force is generated with respect to the tightening direction.

[0032] The replaceable blade 16 is not yet completely pressed down by the tightening bolt 28. The force is applied in a direction of 45 degrees with respect to the position reference surface, so that the reference ends 32, 32 of the replaceable blade 16 are tool The side reference end 18 of the replaceable blade 16 is pressed against the position reference surface 18 on the axial center side, and the side position reference surface 24 of the coneyde type is pressed against the side reference reference 24. The replacement blade 16 is fixed to the replacement blade mounting surface 12 of the cutter 10 by further tightening the tightening bolt 28. Instead of using the cylindrical rubber 39, it is possible to replace the elastic resin with a coil spring.

Example 3

FIGS. 10 to 13 show a replaceable blade positioning mechanism according to a third embodiment of the present invention.

[0034] As shown in FIGS. 10 and 13, a replaceable blade accommodating portion 42 extending in a square groove shape parallel to the cutter shaft is provided at a circumferentially equal position in the cutter 10, generally at a position divided into three. The replaceable blade accommodating portion 42 is formed by a replaceable blade mounting surface 44 that forms a wall surface parallel to the diameter line, an inner wall surface 46 that faces the parallel blade surface, and a groove bottom surface 48. The groove bottom surface 48 in the replaceable blade receiving portion 42 is formed at an acute angle with respect to the replaceable blade mounting surface 44. Further, as shown in FIG. 13, a position reference step portion 50 with which the flank 56 of the replaceable blade 16 abuts is formed in the boundary region between the groove bottom surface 48 and the replaceable blade mounting surface 44.

As shown in FIG. 13, the replaceable blade accommodating portion 42 accommodates a back seat 52 for pressing and fixing the replaceable blade 16 against the replaceable blade mounting surface 44 together with the replaceable blade 16. . The back seat 52 is a long member extending in the longitudinal direction of the replaceable blade 16, and is also referred to as a clamp ing wedge or a backup member. A bottomed hole 60 that allows fitting of the coil spring 58 is formed in the front side surface 54 directed to the replacement blade of the back seat 52. This bottomed hole 60 is provided with a shallow conical saddle 61 so that interference when the coil spring 58 is bent can be avoided. As shown in FIG. 13, the cutter 10 is provided with a screw hole 62 that is parallel to the groove bottom surface 48 and that opens to the replaceable blade receiving portion 42, and a bolt 64 that presses the back 52 is screwed into the screw hole 62. Are combined. A conical hole 68 for receiving the conical end 66 of the bolt 64 extending to the replaceable blade accommodating portion 42 is formed on the back surface of the back seat 52.

Next, the procedure for attaching the replaceable blade in the third embodiment will be described. At the time of attachment, the center of the conical hole 68 is displaced in a direction slightly moving away from the position reference step 50 with respect to the center of the conical end 66 of the bolt 64. For this reason, the thrust when tightening with the bolt 64 comes into contact with the conical bus bar on the position reference step 50 side. As shown in Fig. 12, the reference position on the side face of the replaceable blade 16 is the side face of the main body 10 and the position corresponding to the position reference step 50. The position reference disc 70 which gives is bolted. Cutting blades 16a are formed on both parallel edges of the replacement blade 16, respectively. When the replaceable blade 16 is set in the replaceable blade receiving portion 42, the flank 56 located on the groove bottom surface 48 side of the replaceable blade receiving portion 42 comes into contact with the position reference step 50, so that the cutting blade 16a The protruding position of is defined. Therefore, the flank 56 functions as a reference end for defining the cutting edge position of the replacement blade 16.

As shown in FIG. 13, the replaceable blade 16 has a through hole 30 into which the coil spring 58 is inserted. The through-hole 30 is slightly away from the position reference step 50 with respect to the center of the bottomed hole 60 provided in the back plate 52 and away from the position reference disk 70, that is, in both position reference parts. For example, it is decentered so that the direction is 45 degrees. Instead of the through hole 30, a bottomed hole that can accommodate the coil spring 58 may be used. Further, when the position reference disc 70 is not attached, the displacement moves away only in the direction with respect to the position reference step 50.

[0038] Next, a procedure for inserting the replacement blade 16 and attaching it by the back seat 52 will be described. Insert the coil spring 58 into close contact with the bottomed hole 60 of the back seat 52 (however, close contact is not a requirement), and insert the tip of the coil spring 58 into the through hole 30 of the replaceable blade 16 with the replaceable blade 16 In addition, the back seat 52 is inserted into the replaceable blade receiving portion 42 integrally. At this time, the flank 56 of the replaceable blade 16 is in contact with the position reference step 50, and the side surface of the replaceable blade 16 is in contact with the position reference disc 70.

[0039] The coil spring 58 is displaced in a direction in which the center of the through hole 30 is separated from the position reference portion with respect to the bottomed hole 60 in a state in which the coil spring 58 is tightly fitted in the bottomed hole 60 of the back 52 with no gap. Therefore, when the coil spring 58 stands upright, the position reference portion side outer periphery of the coil spring 58 is supported by the position reference portion side inner wall of the through hole 30 of the replaceable blade 16, and the back seat 52 is positioned at the position reference step. The part 50 and the side face are slightly separated from the position reference disc 70 and floated from the replaceable blade 16. In this state, when the bolt 64 is tightened to press the back seat 52, the position of the conical end 66 of the bolt 64 in the direction of 45 degrees in the center line between the position reference step 50 and the side position reference disk 70. Cone bus force on the reference step 50 side Push the back seat 52 toward the groove bottom 48 and the position reference step 50 through the conical hole 68.

[0040] Prior to pressing the back surface 74 of the replaceable blade 16 by the back seat 52, the coil spring 58 is deformed so as to be bent toward the position reference step 50 due to the deviation of the center, and the bending reaction force is changed. Blade 16 Is moved to the position reference step 50 side, and the flank 56 of the replaceable blade 16 is pressed strongly against the position reference step 50 and the side of the replaceable blade is pressed strongly against the position reference disk 70. Become. When the tightening bolt 64 is further tightened, the back seat 52 securely contacts the bottom surface 48 of the groove, and the friction between the back surface 74 of the replaceable blade 16 and the front side surface 54 of the back seat 52 causes the replaceable blade 16 to be in position reference. Fixed to the step 50 in a pressure contact state. Instead of using the coil spring 58, it may be replaced with a resin having a hard rubber property, a leaf spring, a bar spring or the like.

[0041] The end of the bolt 64 shown in FIG. 13 facing the replaceable blade accommodating portion 42 is formed in a conical shape. Instead, a ball seat 76 is provided at the tip of the bolt 64 as shown in FIG. A spherical body 78 formed and partially cut into the spherical seat 76 may be rotatably inserted. Further, the back surface 80 of the back seat 52 may be an inclined surface with a pressing force applied to the position reference step 50 and the position reference disk 70. Further, by tightening the bolt 64, the coil spring 58 is bent and the replacement blade 16 is pressed against the position reference step portion 50 before the back seat 52 fixes the replacement blade 16 to the replacement blade mounting surface. As shown in Fig. 15, a general bolt with a flat tip may be used.

FIG. 16 and FIG. 17 show another embodiment of the present invention.

The replaceable blade receiving portion 42 has a different shape from that of the third embodiment. That is, the cutting edge 16a of the replacement blade 16 is provided only at one place on one side, and the back face 16c is polished so that it can be reused. A position reference step 50 is formed at the back of the replacement blade mounting surface 44 parallel to the diameter line. The inner wall surface 82 facing the replacement blade mounting surface 44 forms an acute angle with the replacement blade mounting surface 44 so that the position reference step 50 side is narrowed. The dimensions are set so that the bottom does not touch. The groove bottom surface 48 is screwed with screw holes 86 that allow the tightening bolts 84 to be screwed in two places in the width direction.

[0044] The back seat 52 has a wedge shape with a V-shaped cross section, and a conical hole 52b is cut in the surface 52a on the side where the replaceable blade 16 abuts. This conical hole 52b has a pin hole 52c into which the end 88c of the large-diameter coil spring 88 is fitted, and the position reference step 50 side is cut off to about half the cone depth. It is installed. An arcuate surface 52d is formed on the back surface of the back seat 52 that contacts the inclined inner wall surface 82 of the replaceable blade housing portion 42. In addition, a stepped hole 52e into which the headed bolt 84 is inserted is formed in the center of the back seat 52 in correspondence with the screw hole 86 in the width direction. The

As shown in FIG. 17, the conical hole 52b accommodates a coil spring 88 in which the first rod is a large-diameter portion 88b and the subsequent small-diameter adhesive rod portion 88a is concentrically wound several times. One end of the spring 88 can be engaged with the through hole 30 of the replaceable blade 16. The leading end 88c of the large-diameter portion 88b of the first winding is bent outward at a right angle and inserted into the pin hole 52c to function as a detent. Further, the large diameter portion 88b is fixed so as not to protrude by the wall of the conical hole.

[0046] When using the replaceable blade positioning mechanism according to this configuration, the large-diameter portion 88b of the coil spring 88 is fitted into the conical hole 52b of the backing 52, and the tip 88c as a detent is inserted into the pin hole 52c. Let A small diameter coil portion 88a protruding from the conical hole 52b is engaged with the through hole 30 of the replaceable blade 16. Then, the surface of the replaceable blade 16 is brought into contact with the replaceable blade mounting surface 44 by inserting the tapered contact surface 52a of the back seat 52 and the back surface 16c of the replaceable blade 16 into the replaceable blade receiving portion 42 in a close contact state. At the same time, the arc surface 52d of the back seat 52 is opposed to the inclined inner wall surface 82.

[0047] Next, the tightening bolt 84 is passed through the hole 52e in the back 52 and screwed into the screw hole 86 screwed into the cutter 10 to be engaged with the small diameter portion 88a of the coil spring 88. The replaceable blade 16 is pushed by the coil spring 88 and comes into contact with the position reference step 50.

[0048] In this state, since the arc surface 52d of the back seat 52 is about to get on the inclined inner wall surface 82 of the replaceable blade receiving portion 42, only the back seat 52 is pulled. At this time, the center of the conical hole 52b of the back seat 52 is displaced from the center of the through hole 30 of the replaceable blade 16 toward the position reference step 50, so that the coil spring 88 has a large diameter portion 88b and a small diameter portion 88a. Deformation bias is caused at the connecting part of the blade, and the reaction force accompanying the deformation acts on the inner wall 30d on the side of the position reference step 50 in the through-hole 30 of the replacement blade 16, and the replacement blade 16 is pressed against the position reference step 50. .

[0049] By further tightening the bolt 84, the surface 52a directed to the replaceable blade side of the back 52 and the circular arc surface 52d provided on the opposite side correspond to the back surface 16c of the replaceable blade 16 and the inner wall 82 of the accommodating portion 42. Accordingly, the lower reference end 16b of the replaceable blade 16 is securely fixed to the position reference step portion 50 in a pressure contact state.

Claims

The scope of the claims

[1] Cutting having a replaceable blade mounting surface (12) to which the replaceable blade (16) is detachably mounted, and a position reference portion (18) provided on the replaceable blade mounting surface (12) in a protruding shape or a stepped shape. In the tool

The replaceable blade (16) provided with a reference end (32) serving as a reference for attachment at the edge opposite to the blade portion (16a), provided with a through hole (30) in the thickness direction;

An elastic body (38, 39) inserted into the through hole (30);

A fastening member (28) for fixing the replaceable blade (16) to the replaceable blade mounting surface (12) by tightening the elastic body (38, 39);

When the replacement blade (16) is attached, the elastic body (38, 39) is deformed in the lateral direction by compressively inserting it into the through hole (30), so that one of the elastic bodies (38, 39) is deformed. The portion is pressed against the position reference portion (18) side on the inner wall of the through hole (30), and before the tightening force from the tightening member (28) acts on the replacement blade (16), A cutting tool configured to position the reference end (32) of the replaceable blade (16) in pressure contact with the position reference portion (18) by a pressure contact force from the elastic body (38, 39). Replacement blade positioning mechanism.

[2] The elastic body is a compression coil spring (38), the fastening member is a fastening bolt (28), and a seating surface for coil spring seating (40) recessed in the replacement blade mounting surface (12) (40) ) Is provided with a slope or step that is downwardly inclined toward the position reference portion (18), and the coil spring (38) is tightened by tightening the tightening bolt (28) inserted into the center hole of the coil spring (38). ) Is bent in the direction toward the position reference portion (18), and the coil spring (38) is interposed between the position reference portion (18) side and the tightening bolt (28) on the inner wall of the through hole (30). The replaceable blade positioning mechanism for a cutting tool according to claim 1, wherein the pressure contact force is generated by pushing in the cutting tool.

[3] The elastic body is a cylindrical elastic material (39), the fastening member is a fastening bolt (28), and the center of the through hole (30) of the replacement blade (16) is The center hole of the cylindrical elastic member (39) is slightly displaced in the direction away from the position reference portion (18) with respect to the center of the screw hole (26) screwed on the replacement blade mounting surface (12). The cylindrical bolt (28) is inserted into the through hole (30) of the replaceable blade (16) and screwed into the screw hole (26) to tighten the cylindrical elastic material (39). The cylindrical elastic material (39) is inserted between the position reference portion (18) side of the inner wall of the through hole (30) and the tightening bolt (28) by compressing in the axial direction and expanding in the lateral direction. By filling the pressure The replaceable blade positioning mechanism for a cutting tool according to claim 1, wherein the contact force is generated.

A replaceable blade mounting surface (44) parallel to the diameter line, a position reference portion (50) of the replaceable blade (16) formed at least in the back of the replaceable blade mounting surface (44), and the replaceable blade (16) A back seat (52) that secures the blade to the blade mounting surface (44), a receiving surface (48) that makes an acute angle with the blade mounting surface (44), and a tightening bolt (64) that tightens the back seat (52) In the cutting tool in which a plurality of replaceable blade accommodating portions (42) combined with each other are provided on the circumference, the replaceable blade (16) has a through hole (30) in the thickness direction and a reference end serving as a reference for the position of the blade edge. (56, 16b) is formed and the center of the through hole (30) of the replaceable blade (16) is formed on the surface of the back plate (52) in contact with the replaceable blade (16) when the replaceable blade is mounted. With respect to the position reference portion (50), a bottomed hole (60) whose center is slightly displaced is formed, and the bottomed hole (60) is projected by being inserted into the bottomed hole (60). An elastic body (58, 88) engaged with the through hole (30),

By tightening the tightening bolt (64), the back seat (52) is pushed toward the position reference portion (50), and the elastic body (58,88) protrudes from the bottomed hole (60). The outer periphery is pressed against the inner wall of the through hole (30) on the side of the position reference portion (50), and the portion protruding from the bottomed hole (60) of the elastic body (58, 88) is bent or biased. Thus, prior to the tightening force acting on the replaceable blade (16), the replaceable blade (16) is pressed with a force that presses the reference end (56, 16b) of the replaceable blade (16) against the position reference portion (50). ) Configured to position

A replaceable blade positioning mechanism for a cutting tool.