JP4996219B2 - Mounting method of tool head and insert holder - Google Patents

Description

The present invention relates to a tool head for rotating a cutting blade included in an insert holder by rotating a tool head main body to which the insert holder is attached around an axis, and a method for attaching the insert holder to the tool head main body.

  2. Description of the Related Art Conventionally, cutting tools such as a boring tool and a milling tool are provided with a tool head that rotates a cutting blade protruding from a tool head body. As shown in FIG. 5, such a tool head 100 includes a tool head main body 102, an insert holder 106 to which a cutting blade 104 is attached, and a quill in which the insert holder 106 is fixed to one end of the tool head main body 102. 108 and an adjusting screw 110 that adjusts the protruding amount of the quill 108 by being screwed and rotated in the direction of the axis L3 of the quill 108 at the other end of the quill 108. It is known that the protruding amount of the cutting blade 104 fixed to one end of the quill 108 is adjusted via the insert holder 106 by moving the attached quill 108 in the direction of the axis L3 (for example, Patent Documents). 1 and 2).

  The tool head 100 described in Patent Document 1 is integrally provided with an insert holder 106 to which a quill 108 attached to a tool head main body 102 and advanced and retracted in the axial direction L3 and a cutting blade 104 are attached. There's a problem.

  That is, in the tool head 100 described above, rotation around the axis is prevented by inserting the detent key 114 into the key groove 112 provided in the quill 108. However, the key groove 112 and detent key 114 are prevented. Since there is a slight gap (play) in the direction around the axis L3, when the adjustment screw 110 is rotated, the quill 108 is rotated in the rotation direction of the adjustment screw 110 by the friction force, and the position of the cutting edge 104 is changed. In addition, there is a problem that the cutting resistance acts on the non-rotating key 114 and the rigidity is low and precise cutting is difficult.

In the tool head described in Patent Document 2, the insert holder is fixed to the quill with a bolt, and the quill and the insert holder are provided separately. Even in such a case, the insert holder is quilled. In order to prevent rotation around the bolt with respect to the quill and the insert holder, a rotation prevention key and a key groove are provided, respectively, and the frictional force acting on the quill is transmitted to the insert holder by the rotation operation of the adjusting screw, As in the case described above, there is a problem that the cutting edge position stability and rigidity are low, and precise cutting is difficult.
Japanese Utility Model Publication No. 10-504 JP-A-4-24430

  The present invention has been made in view of the above problems, and in a tool head capable of adjusting the protrusion amount of the cutting blade with respect to the tool head body, the position of the cutting blade is stabilized and the rigidity is improved and the accuracy is improved. It aims at providing the tool head which can perform cutting.

  A tool head according to the present invention includes a tool head main body that rotates about an axis, an insert holder to which a cutting blade is attached, a quill that is attached to the tool head main body and the insert holder is fixed to one end, and the insert holder. A tool head comprising: a bolt for fixing the quill; and an adjustment screw that adjusts a protruding amount of the quill by being screwed and rotated in the axial direction of the quill at the other end of the quill. The insert holder has a base formed with a through-hole through which the bolt is inserted, and a cutting blade mounting portion formed with a tip seat surface protruding from the base and provided with the cutting blade on the front side in the cutting direction. Then, by rotating the bolt in the tightening direction, it is formed on the rear side in the cutting direction of the cutting blade mounting portion by the frictional force between the bolt and the base portion. Supporting surface abutting jaw which is is characterized in that it is formed in the tool head body.

  In the above invention, the insert holder may be attached without the quill and the base engaging with the rotation direction of the bolt.

  Another one of the present invention is a tool head body that rotates about an axis, an insert holder to which a cutting blade is attached, a quill that is attached to the tool head body and the insert holder is fixed to one end, An adjustment screw that adjusts the protruding amount of the quill relative to the tool head body by being screwed and rotated in the axial direction of the quill at the other end of the quill, and is attached to the tool head body. In an insert holder mounting method for fixing the insert holder to a quill with a bolt, a base portion having a through-hole through which the bolt is inserted, and a chip seating surface protruding from the base portion for disposing the cutting blade are provided. A cutting edge mounting portion formed on the front side in the cutting direction is formed on the insert holder, and the bolt is rotated in the tightening direction. Thus, the insert holder is rotated about the bolt relative to the tool head body by the frictional force between the bolt and the base, and the support formed on the rear side in the cutting direction of the cutting blade mounting portion. The surface is brought into contact with the tool head body.

In the above invention, when the adjusting screw is rotated and then the bolt is rotated in the tightening direction, the adjusting screw rotating direction viewed from the adjusting screw operating direction and the bolt viewed from the bolt operating direction. The direction of rotation may be the same. Moreover, in the said invention, you may attach the said insert holder to the said quill, without the said quill and the said base part engaging in the rotation direction of the said volt | bolt.

  According to the present invention, since the cutting direction rear side of the cutting blade mounting portion to which the cutting blade is mounted is in contact with and supported by the tool head body, the position and rigidity of the cutting blade at the time of cutting can be stabilized. Cutting performance can be demonstrated.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of the tool head 10 according to the present embodiment, and FIG. 2 is a cross-sectional view of the tool head 10 corresponding to the cross-sectional view taken along the line AA in FIG.

  As shown in FIGS. 1 and 2, the tool head 10 according to the present embodiment is a cut that protrudes by a predetermined amount from the substantially cylindrical tool head body 12 that rotates in the direction of the arrow R around the axis L1 to the outer periphery of the tip. A boring tool in which a blade (insert tip) 40 is provided, which is a tool head main body 12, a quill 20 inserted into a through-hole 14 formed in the tool head main body 12, and a bolt 50 at the tip of the quill 20. The insert holder 60 detachably disposed by the screw, the cutting edge 40 disposed to be replaceable by a screw 42 or the like at the outer peripheral end of the insert holder 60, and the quill 20 screwed to the insert holder 60. And an adjusting screw 80 for adjusting the protruding amount of the cutting blade 62.

  A cylindrical through hole 14 penetrating in the radial direction is formed at the tip of the tool head main body 12, and the tool head main body 12 on one end side of the through hole 14 is depressed to accommodate the insert holder 60. A portion 15 is formed.

  The quill 20 is formed in a substantially cylindrical shape, and can slide in the direction of the axis L <b> 2 of the quill 20 by sliding with the inner wall that defines the through hole 14. One end of the quill 20 forms an attachment surface 30 to which the insert holder 60 is attached, and a bolt hole 26 into which a left-handed bolt 50 is screwed is formed. The attachment surface 30 has the bolt hole 26 as a center. A cylindrical protrusion 32 is formed. A screw hole 28 into which the adjustment screw 80 is screwed is formed at the other end of the quill 20.

  The insert holder 60 attached to one end of the quill 20 includes a base 62 having a through hole 64 through which the bolt 50 is inserted, and a cutting projecting from the outer peripheral surface of the base 62 along the tangent to the tip of the tool head body 12. A blade mounting portion 66.

  The base 62 is engaged with a protrusion 32 formed on the mounting surface 30 of the quill 20 at the mounting surface 68. As described above, the protrusion 32 has a cylindrical shape with the bolt hole 26 as the center, and the mounting surfaces 30 and 68 of the quill 20 and the base 62 do not engage with each other in the rotation direction of the bolt 50. The rotational force around the axis L <b> 2 acting on the quill 20 by the adjusting screw 80 is not transmitted to the insert holder 60.

  When the insert holder 60 is assembled to the quill 20, the cutting blade mounting portion 66 has a tip seat surface on the front side in the rotational direction R of the tool head body 12 of the cutting blade mounting portion 66, that is, on the front side in the cutting direction R. 70 is formed, and the cutting edge 40 is fixed to the chip seating surface 70 by a screw 42 so as to be replaceable. Further, on the rear side in the cutting direction R, a support surface 72 is formed and faces the jaw portion 17 of the housing portion 15 formed in the tool head main body 12.

  Such an insert holder 60 is fixed to the quill 20 by screwing the bolt 50 into the bolt hole 26 with the mounting surface 68 engaged with the mounting surface 30 of the quill 20 and assembled to the quill 20. At the time of fastening and fixing, the bolt 50 is formed with a left-handed male screw, so that the frictional force generated between the bolt 50 and the base 62 by rotating the bolt 50 in the fastening direction as shown in FIG. As a result, the insert holder 60 rotates around the bolt 50, and the support surface 72 of the cutting blade mounting portion 66 and the jaw portion 17 of the housing portion 15 facing this contact with each other in a surface contact state. Thus, the frictional force generated by the bolt 50 acts so as to press the support surface 72 against the jaw portion 17, thereby fixing the insert holder 60 in the cutting direction.

  The adjustment screw 80 has a first male screw portion 82 that is screwed into the screw hole 28 of the quill 20 on the distal end side, and an inner peripheral surface of the adjuster string 34 between the first male screw portion 82 and the screw head 84. A second male screw portion 86 is formed to be screwed with the female screw portion 36 formed in the above.

  The adjustment screw 80 constitutes a differential screw in which the pitch P1 of the first male screw portion 82 is set larger than the pitch P2 of the second male screw portion 86. When the adjustment screw 80 is rotated once, the quill 20 penetrates. While sliding along the inner wall of the hole 14, it moves in the direction of the axis L 2 by a pitch difference (P 1 -P 2) between both male screw portions 82 and 86, and finely adjusts the protruding amount of the cutting edge 40 relative to the tool head body 12. ing.

  On the surface of the screw head 84 of the adjustment screw 80, a scale indicating the rotation amount of the adjustment screw 80 is provided, and a polygonal wrench hole 88 is formed so as to be rotated by a hexagon wrench or the like.

  A key groove 22 extending in the direction of the axis L2 of the quill 20 is formed on one side surface of the quill 20, and the detent key 16 is inserted into the key groove 22 with play. As a result, the quill 20 is prevented from rotating in the circumferential direction while ensuring movement in the direction of the axis L2.

  Further, a flat surface portion 24 extending in the direction of the axis L2 is formed on the other side surface of the quill, and the side lock screw 18 comes into contact with the flat surface portion 24 from the outer peripheral side of the tool head main body 12 so that the quill 20 is moved to the tool head. It is fixed to the main body 12.

  Next, in the tool head 10 of this embodiment, refer to FIG. 3 and FIG. 4 for a method of fixing the insert holder 60 to the quill 20 attached to the tool head body 12 and a method of adjusting the protruding amount of the cutting blade 40. To explain. FIG. 3 is a view showing the mounting process of the insert holder 60. The positional relationship between the quill 20 and the rotation stopper key 16 and the positional relationship between the insert holder 60 and the jaw portion 17 in the first process and the second process are shown in FIG. 4 is an explanatory diagram schematically showing the rotational operation direction of FIG. 4. FIG. 4 shows the positional relationship between the quill 20 and the detent key 16 and the positional relationship between the insert holder 60 and the jaw portion 17 in each process. 4A and 4B are explanatory diagrams schematically showing the operation direction, in which FIG. 4A shows a step of adjusting the protruding amount, and FIG. 4B shows a step of fixing the quill 20 by contacting the side lock 18.

  In the first step shown in FIG. 3A, first, before attaching the insert holder 60 to the quill 20, the adjusting screw 80 is rotated in one direction (counterclockwise in the present embodiment), for example, the protrusion amount is the minimum value. Thus, the protruding amount of the cutting blade 40 with respect to the tool head body 12 is changed.

  In this step, the adjusting screw 80 is rotated counterclockwise in the same counterclockwise direction as the bolt 50 is tightened. 3 is shown in the direction of the rotation operation of the bolt 50, the counterclockwise direction in the direction of the rotation operation of the adjustment screw 80 is shown in the clockwise direction in the drawing as indicated by the arrow A.

  Since there is a gap (play) in the circumferential direction of the quill 20 between the detent key 16 and the key groove 22, the bolt 20 is also turned until the detent key 16 comes into contact with the rotation of the adjusting screw 80. It rotates in the clockwise direction indicated by the arrow A when viewed from the direction of 50 rotational operations.

  Next, in the second step shown in FIG. 3B, the bolt 50 is tightened in the state where the mounting surface 30 of the quill 20 and the mounting surface 68 of the insert holder 60 are engaged and the insert holder 60 is assembled to the quill. The quill 20 is fixed to the holder 60.

  In this process, since the male screw of the left-hand thread is formed on the bolt 50, the insert holder 60 is centered on the bolt 50 by the frictional force generated between the bolt 50 and the base 62 by rotating the bolt 50 in the tightening direction. Then, by rotating counterclockwise as indicated by the arrow B, the support surface 72 of the cutting blade mounting portion 66 and the jaw portion 17 of the accommodating portion 15 facing this are brought into contact with each other in a surface contact state. As a result, the insert holder 60 is supported by the jaw 17 and is fixed against the cutting force acting in the direction of the arrow C.

  In this step, the support surface 72 of the insert holder 60 and the jaw portion 17 are in surface contact, and even if the bolt 50 is tightened, the insert holder 60 does not rotate in the tightening direction. As in the first step, the right side of the detent key 16 and the quill 20 are in contact with each other in FIG.

  The insert holder 60 fixed to the quill 20 as described above adjusts the protruding amount of the cutting blade 40 attached to the chip seating surface 70 with the adjusting screw 80, and then makes the side lock screw 18 contact to bring the quill 20 into contact. The insert holder 60 does not rotate around the bolt 50 even if it is fixed.

  Specifically, in the state where the insert holder 60 is attached to the quill 20 as described above, the protruding amount of the cutting blade 40 is set to the minimum value, so as shown in FIG. 80 is rotated in the other direction (clockwise in the present embodiment) to adjust while increasing the protruding amount of the cutting blade 40 with respect to the tool head body 12. 4A is shown in the direction of the rotation operation of the bolt 50, the clockwise direction in the direction of the rotation operation of the adjusting screw 80 is shown in the counterclockwise direction in the drawing as indicated by the arrow D. .

  In this protrusion amount adjustment step, the adjustment screw 80 is rotated counterclockwise as indicated by an arrow D in FIG. 4A in the rotational operation direction of the bolt 50, whereby the quill 20 is indicated in the counterclockwise direction indicated by the arrow D. The rotating force acts on the. However, since the support surface 72 of the insert holder 60 fixed to the quill 20 is in contact with the jaw portion 17 of the tool head body 12 and rotation in the counterclockwise direction is prohibited, the anti-rotation key 16 and the key groove 22 are prevented. Even if there is a gap S that allows the quill 20 to rotate in the counterclockwise direction indicated by the arrow D, the quill 20 is not rotated by the rotation operation of the adjusting screw 80.

  Next, after adjusting the protrusion amount of the cutting blade 40 as described above, the side lock screw 18 is tightened and brought into contact with the flat portion 24 as shown in FIG. Secure to the body 12.

  In this fixing step, as shown in FIG. 4B, the right side of the detent key 16 in the drawing and the quill 20 are in contact with each other, and the distance from the side lock screw 18 increases toward the left side of the flat portion 24 in the drawing. Therefore, when the side lock screw 18 is tightened, only the left side of the flat surface portion 24 comes into contact with the side lock screw 18.

  When the side lock screw 18 comes into contact with the quill 20 in this way, a rotational force acts on the quill 20 in the direction indicated by the arrow E, but the support surface 72 of the insert holder 60 is the jaw portion 17 of the tool head body 12. Since the rotation in the counterclockwise direction is prohibited, the quill 20 does not rotate even if the side lock screw 18 is tightened in a single-contact state.

  The insert holder 60, which has been fixed to the quill 20 in this way and whose protrusion amount of the cutting blade 40 is adjusted, has a support surface 72 formed on the rear side in the cutting direction of the cutting blade mounting portion 66 of the tool head body 12. Since it is in contact with the jaw portion 17, the position and rigidity of the cutting edge 40 attached to the chip seat surface 70 are stabilized, and cutting can be performed with high accuracy.

It is a disassembled perspective view of the tool head concerning one Embodiment of this invention. FIG. 2 is a cross-sectional view of the tool head in a state where an insert holder corresponding to the cross-sectional view along the line AA in FIG. 1 is attached. It is explanatory drawing which showed typically the positional relationship of a quill and a rotation prevention key in each process, and the positional relationship of an insert holder and a jaw part by the rotation operation direction view of a volt | bolt, Comprising: (a) is a 1st process, (b ) Shows the second step. It is explanatory drawing which showed typically the positional relationship of a quill and a rotation stop key in each process, and the positional relationship of an insert holder and a jaw part by the rotation operation direction view of a volt | bolt, Comprising: (a) is the process of adjusting protrusion amount. (B) shows the process of fixing the quill 20 by abutting the side lock 18. It is sectional drawing of the conventional tool head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Tool head 12 ... Tool head main body 17 ... Jaw part 18 ... Side lock screw 20 ... Quill 30 ... Mounting surface 40 ... Cutting blade 50 ... Bolt 60 ... Insert holder 62 ... Base 66 ... Cutting blade mounting part 68 ... Mounting surface 70 ... chip seat surface 72 ... support surface 80 ... adjustment screw

Claims (3)

A tool head body that rotates about an axis; an insert holder to which a cutting blade is attached; a quill attached to the tool head body and fixed to the insert holder at one end; and a bolt that fixes the insert holder to the quill. A tool head comprising: an adjusting screw that adjusts a protruding amount of the quill by screwing and rotating in the axial direction of the quill at the other end of the quill,
The insert holder includes a base portion in which a through-hole for inserting the bolt is formed, and a cutting edge mounting portion in which a tip seat surface that protrudes from the base portion and in which the cutting blade is disposed is formed on the front side in the cutting direction. Have
By rotating the bolt in the tightening direction, a jaw portion that contacts a support surface formed on the rear side in the cutting direction of the cutting blade mounting portion is formed in the tool head body by the frictional force between the bolt and the base portion. Tool head characterized by being made. A tool head body that rotates about an axis; an insert holder to which a cutting blade is attached; a quill that is attached to the tool head body and to which the insert holder is fixed at one end; and an axis of the quill at the other end of the quill An adjusting screw that adjusts a protruding amount of the quill relative to the tool head body by being screwed in the direction and rotating, and an insert for fixing the insert holder to the quill attached to the tool head body with a bolt In the mounting method of the holder,
A base portion formed with a through-hole through which the bolt is inserted, and a cutting blade mounting portion having a tip seat surface protruding from the base portion and provided with a tip seat surface on the front side in the cutting direction. Formed on the holder,
By rotating the bolt in the tightening direction, the insert holder is rotated around the bolt with respect to the tool head body by the frictional force between the bolt and the base, and the cutting direction of the cutting blade mounting portion A method of attaching an insert holder, wherein a support surface formed on a rear side is brought into contact with the tool head body. After rotating the adjustment screw, the mounting method of the insert holder to rotate the bolt in the tightening direction,
The mounting direction of the insert holder according to claim 2, wherein the rotation direction of the adjustment screw viewed from the operation direction of the adjustment screw is the same as the rotation direction of the bolt viewed from the operation direction of the bolt. Method.

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