JP2006130588A - Holder of cutting tool for finishing inner diameter and holder of cutting tool for machining inner diameter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a holder for machining an inner diameter of a hole to be machined while holding a cutting tool. <P>SOLUTION: A slider 38 is moved in the radial direction of a holder body 20 by a finishing blade moving device 50 including a spring, a single-acting cylinder 52, a movable bar 54, and a motion converting mechanism 56. A finishing blade 40 is moved to a retreat position retreated from a semi-finishing blade 30 and a radially and externally protruded finishing position. Liquid pressure of a coolant is applied to a piston 90 during the semi-finishing work so as to allow it to advance against elastic force of the spring 92. The movable bar 54 is advanced by it. The slider 38 is made to follow a driving part 64 by energization of the spring and it is retreated. Consequently, the finishing blade 40 is moved to the retreat position. The liquid pressure of the coolant is reduced during the finishing work so as to allow the piston 90 to retreat by the energization of the spring 92. The movable bar 54 is retreated by it. The slider 38 is advanced by the action of slopes of inclined faces 68, 78. Consequently, the finishing blade 40 is moved to the finishing position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an inner diameter finishing tool holder and an inner diameter processing tool holder, and in particular, processes the inner peripheral surface of a hole to be machined by moving the tool to two different positions in the radial direction of the holder body. It relates to a holder to be applied.

A holder that performs roughing and finishing on the inner peripheral surface of a hole to be machined is described in Patent Document 1 below. In this inner diameter finishing tool holder, a cutting tool holding member for holding a roughing tool and a finishing tool is attached to the holder body via an elastic deformation member. The elastic deformation member is fixed to the holder main body at one end thereof, but the free end portion side which is the other end is movable in the radial direction of the holder main body by elastic deformation, A blade holding member is attached. An air cylinder and a hydraulic cylinder are provided in series in the holder body, and the pistons are connected to move integrally. The supply of air to the air cylinder causes the piston of the air cylinder to advance. At the same time, the piston of the hydraulic cylinder is advanced, and the hydraulic pressure generated in the hydraulic chamber is supplied to the drive unit provided in the elastic deformation member. Thereby, the elastic deformation member is elastically deformed and the blade holding member is moved.
The cutting tool for roughing and the cutting tool for finishing are respectively held at two positions of the cutting tool holding member separated in the diameter direction of the holder body. In the initial state where no hydraulic pressure is generated, the finishing tool is rough. Positioned radially outward from the cutting tool, maximum hydraulic pressure is generated in the hydraulic cylinder, and the roughing cutting tool protrudes radially outward from the finishing tool when the elastic deformation of the elastically deforming member is maximum. Is positioned at the machining position. In this state, the holder is advanced while being rotated, and roughing is performed. Further, if the hydraulic pressure of the hydraulic cylinder is reduced, the elastic deformation amount of the elastic deformation member is reduced, and the finishing cutting tool is positioned at a processing position protruding outward in the radial direction from the roughing cutting tool. While being rotated, it is retracted and finishing is performed. The processing position of the finishing tool is adjusted by controlling the pressure of the air supplied to the air cylinder and controlling the magnitude of the hydraulic pressure generated in the hydraulic cylinder. For this reason, when the finishing tool is worn, the hydraulic pressure is controlled, and the processing position of the finishing tool is adjusted so that the processing radius becomes a preset size.
JP 2003-311517 A

However, in the cutting tool holder for inner diameter finishing described in Patent Document 1, in order to be able to supply air into the holder body, it is impossible to supply coolant through the holder body, and the coolant may be applied from the outside. As a result, there is a problem that the coolant supply amount is insufficient when processing deep holes, and the cooling performance is lowered.
This problem is not limited to the case where the inner peripheral surface of the hole to be processed is finished, but the blade is moved to two different positions in the radial direction of the holder body using the air supplied into the holder body. The same occurs when the inner peripheral surface of the processed hole is processed.
The present invention has been made against the background of the above circumstances, and has a cutting tool having a radial component of the holder body, such as a holder that holds the pre-processing blade and the finishing blade and finishes the inner diameter of the hole to be processed. It is an object to improve the holder that moves in the direction to process the inner diameter of the hole to be processed.

In order to solve the above-mentioned problem, an inner diameter finishing blade holder according to the present invention includes: (a) a holder body provided with a mounting portion attached to a rotating tool spindle; and (b) the holder body with the holder. A pre-machining blade mounted protruding outward in the radial direction from the outer peripheral surface of the main body, (c) a finishing blade, and (d) holding the finishing blade, and holding the radial component of the holder body in the holder main body A finishing blade holding member that is held so as to be relatively movable in the direction it has, and (e) actuated by the hydraulic pressure of the coolant supplied to the holder body, by moving the finishing blade holding member, the finishing blade, A finishing blade moving device that moves to a finishing processing position that protrudes radially outward from the front processing blade and a retracted position that retreats from the front processing blade is included.
The pre-processing may be processing performed prior to finishing processing, and includes not only intermediate finishing processing but also rough processing.

In the inner diameter finishing tool holder configured as described above, when machining is performed by the pre-machining blade, the finishing blade is positioned at the retracted position so as not to contact the workpiece. After finishing with the front working blade, the finishing blade holding member is moved forward, the finishing blade is moved to the finishing position, and is projected outward in the radial direction from the front working blade for finishing.
Since the finishing blade holding member is moved using the liquid pressure of the liquid coolant supplied to the holder body, the coolant can be supplied from the inside of the holder to the pre-processing blade and the finishing blade, and the hole to be processed is deep. Even if it is a hole, coolant can be sufficiently supplied. In addition, the holder or the machine tool can be configured at a lower cost than when a dedicated drive source is provided to move the finishing blade holding member.
In addition, liquid coolant is usually supplied to cutting machines regardless of whether it is a dedicated machine or a general-purpose machine. To move the finishing blade holding member using this, the device side is moved while rotating the holder. No modification is required or less, and processing can be performed easily and inexpensively.
Furthermore, the holder according to the present invention can be easily used in a general-purpose machine such as a machining center.

Aspects of the Invention

  In the following, the invention that is claimed to be claimable in the present application (hereinafter referred to as “claimable invention”. The claimable invention is at least the “present invention” to the invention described in the claims. Some aspects of the present invention, including subordinate concept inventions of the present invention, superordinate concepts of the present invention, or inventions of different concepts) will be illustrated and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention.

  In the following paragraphs, (1) corresponds to claim 1, (2) corresponds to claim 2, (4) corresponds to claim 3, (6) corresponds to claim 4, Claim (7) corresponds to claim 5, and claim (16) corresponds to claim 6.

(1) a holder body having an attachment portion attached to a rotating tool spindle;
A pre-cutting blade attached to the holder body so as to protrude radially outward from the outer peripheral surface of the holder body;
A finishing blade,
A finishing blade holding member that holds the finishing blade and is held by the holder body so as to be relatively movable in a direction having a radial component of the holder body;
The finishing blade is moved by a hydraulic pressure of the coolant supplied to the holder body, and the finishing blade holding member is moved, so that the finishing blade protrudes radially outward from the front processing blade and the front processing blade. A cutting tool holder for inner diameter finishing processing, including a finishing blade moving device that moves to a further retracted position.
(2) The finishing blade moving device is
A piston that is fluid-tightly and slidably fitted to a cylinder bore formed in the holder body, and that is operated by the hydraulic pressure of the coolant;
A movable member movable in the axial direction together with the piston;
The inner diameter finishing cutting tool holder according to item (1), further comprising: a motion conversion mechanism that converts an axial movement of the movable member into a movement in a direction having a radial component of the finishing blade holding member.
The piston and the movable member may be configured integrally or may be directly fixed, or may be provided separately and moved together via the other member.
By supplying the coolant, the piston and the movable member are moved, and the finishing blade holding member is moved in a direction having a radial component, so that the position of the finishing blade in the radial direction is changed.
According to the holder of this section, the hydraulic pressure of the coolant may be applied to the piston, and the hydraulic pressure of the coolant can be easily used for moving the finishing blade.
(3) The blade holder for inner diameter finishing processing according to (2), including a stopper that defines a stroke end of the piston at a position corresponding to the finishing processing position of the finishing blade.
The stopper may directly define the stroke end of the piston by abutting with the piston or indirectly by abutting with a member such as a movable member that moves integrally with the piston. In any case, the finishing blade is positioned at the finishing position with the piston operating to the stroke end defined by the stopper, so that the machining position can be clearly defined. If the motion conversion mechanism is to transmit the force to retract the finishing blade from the finishing position based on the cutting resistance to the piston as a piston driving force that moves the piston from the stroke end, the stopper is After defining the stroke end, it is necessary to apply a force based on the coolant pressure or the elastic force of the elastic member to the piston until the contact force of the stopper exceeds the piston driving force. However, even if the motion conversion mechanism does not transmit the piston driving force based on cutting resistance to the piston, the force that holds the piston in that position after the stroke end of the piston is defined by the stopper is hydraulic or elastic. It is desirable to continue application by the elastic force of the member.
(4) A first elastic member that urges the piston toward the original position is included, and the piston operates in cooperation with the holder body against the elastic force of the first elastic member by the hydraulic pressure of the coolant. The inner diameter finishing tool holder according to item (2) or (3) constituting a single acting cylinder.
A double acting cylinder can also be constructed in cooperation with the holder body in the piston. The fluid pressure of the coolant is selectively applied before and after the piston to reciprocate the movable member, but in that case, a switching device for switching the operation of the coolant is required. Compared to the case of using a moving cylinder, the holder can be configured easily and inexpensively. In particular, if the original position of the piston corresponds to the finishing position of the finishing blade and the original position is defined by the stopper in (3), the piston must be kept in the original position by the elastic force of the elastic member. Thus, the finishing blade is stably maintained at the finishing position. In addition, as will be described in detail in the section of the embodiment, the coolant for operating the piston is compared with the case where the piston is kept at a position corresponding to the finishing position of the finishing blade by the hydraulic pressure of the coolant. There is also an advantage that the hydraulic pressure is low.
(5) The motion conversion mechanism holds the finishing blade holding member at a position where the finishing blade is positioned at the finishing position in a state where the piston is held at the original position by the first elastic member. The blade holder for inner diameter finishing according to item (4).
As described in the item (3), the hydraulic pressure of the coolant for operating the piston can be low.
(6) The cylinder bore is formed around the axis of the holder body, the movable member is held by the holder body so as to be movable in a direction parallel to the axis of the holder body, and the finishing blade holding member is a radius of the holder body. The blade holder for inner diameter finishing processing according to any one of items (2) to (5), which is held in the holder body so as to be movable in a direction.
The finishing blade holding member is moved in the radial direction without changing the position in the direction parallel to the axis of the holder body, and the finishing blade is moved to the finishing position and the retracted position without extra movement. .
In the holder of this section, the piston is provided coaxially with the holder main body, and it is easy to balance the rotation of the holder. It is desirable to provide the movable member as coaxial as possible with the piston.
(7) One of the movable member and the finishing blade holding member has an inclined surface inclined with respect to the axis of the holder body, and the other of the movable member and the finishing blade holding member engages with the inclined surface. An engagement portion, wherein the motion conversion mechanism includes the inclined surface and the engagement portion, and the finishing blade moving device engages the finishing blade holding member with the engagement portion and the inclined surface. The blade holder for inner diameter finishing processing according to item (6), including a second elastic member biased in the direction.
The position of the holder body in the radial direction of the portion where the inclined surface and the engaging portion engage with each other is changed by the movement of the movable member. Is maintained in an engaged state, and is moved in a direction having a radial component in accordance with a change in a radial position of a portion where the inclined surface and the engaging portion are engaged. The position of the finishing blade holding member in the radial direction is uniquely determined according to the position of the movable member by the biasing of the second elastic member, and the finishing position is determined. As in the embodiment, it is desirable that the engaging portion that engages with the inclined surface is also an inclined surface corresponding to the inclined surface in order to reduce the surface pressure and wear of the engaging portion.
(8) The inclined surface and the engaging portion are provided at a position where a force applied to the finishing blade holding member is received based on a cutting resistance acting on the finishing blade in a state where both of them are engaged. The blade holder for inner diameter finishing according to (7).
The force based on the cutting resistance is received by the movable member by the engagement between the inclined surface and the engaging portion. Therefore, compared with the case where it is received by the elastic force of the elastic member, the finishing blade is firmly held at the finishing position. It is also possible to provide the inclined surface and the engaging portion so that the elastic force of the second elastic member acts on the finishing blade holding member in a direction against the force based on the cutting resistance. However, in that case, the second elastic member receives a force based on the cutting resistance. If the second elastic member has a large set load, it can receive a force based on cutting resistance, but it is relatively difficult to increase the set load of the second elastic member.
If the force based on the cutting force is rigidly received by the movable member, and further the force received by the movable member is rigidly received by the holder body, the force based on the cutting resistance is applied to the finishing blade holding member and the movable member. The holder body is rigidly received via the member, and the finishing blade is more firmly maintained at the finishing position. A frictional force acts between the inclined surface and the engaging portion, and depending on the relationship between the friction coefficient between them and the inclination angle of the inclined surface, the axial component of the frictional force is based on the cutting resistance. The force acting on the finishing blade holding member is larger than the axial component of the holder body (so-called deadlock state), and the axial force may not be applied to the movable member due to cutting resistance. However, in general, vibration is easily transmitted to the cutting holder and the frictional force is remarkably reduced by the vibration. Therefore, even if the frictional force is zero, the movable member is axially dependent on the force caused by the cutting resistance. It is desirable not to be moved. For this purpose, a force sufficient to oppose the axial force transmitted to the movable member due to the effect of the slope is applied to the piston, which is easy.
(9) The inner diameter finishing process according to any one of (2) to (8), including an adjustment mechanism that is provided between the piston and the movable member and adjusts a relative position between the piston and the movable member. Cutting tool holder.
If the relative position between the piston and the movable member is adjusted, the position of the movable member when the finishing blade is positioned at the finishing blade machining position is changed, and the finishing machining position is adjusted. Thereby, for example, even if there are manufacturing errors and assembly errors of the components of the holder, wear of the finishing blade, etc., the finishing blade can be accurately positioned at the finishing position.
In a mode in which this item is subordinate to item (3), the finishing position of the finishing blade obtained in a state where the stroke end of the piston is defined by the stopper can be changed by adjusting the relative position between the piston and the movable member. The finishing position can be adjusted without controlling the hydraulic pressure. In the holder described in Patent Document 1, in order to adjust the finishing position of the finishing tool, it is necessary to control the magnitude of the air pressure supplied to the air cylinder, which is controlled as an air pressure control device. Whereas high accuracy is required, the adjustment of the relative position between the piston and the movable member can be easily performed by mechanically configuring the adjustment mechanism, for example, and the finishing position can be set. It can be adjusted easily.
(10) The adjustment mechanism is
A screw mechanism that includes a male screw member and a female screw member that are screwed together, and one of the screw members moves with the piston and the other moves with the movable member;
An anti-rotation mechanism for preventing one of the male screw member and the female screw member from rotating;
The blade holder for inner diameter finishing processing according to item (9), including a rotation mechanism that adjusts the relative position of the piston and the movable member by rotating the other of the male screw member and the female screw member.
According to this section, the adjustment mechanism can be realized with a simple configuration. In addition, it is desirable that the screw mechanism, the rotation prevention mechanism, and the rotation mechanism are configured symmetrically with respect to the axis of the holder body in terms of mass in order to improve the rotation balance of the holder having an adjustment function.
(11) The blade holder for inner diameter finishing according to (10), wherein the male screw member is formed integrally with the movable member, and the female screw member is brought into contact with the piston so as to be relatively rotatable.
(12) The blade holder for inner diameter finishing processing according to (11), wherein the female screw member is indirectly brought into contact with the piston through a first thrust bearing.
According to the holder of this section, the friction between the female screw member and the piston is reduced by the first thrust bearing, and the female screw member can be rotated easily.
(13) A first elastic member that urges the piston toward the original position is included, and the first elastic member is brought into contact with the female screw member via a second thrust bearing. The blade holder for inner diameter finishing processing according to item (12), wherein an elastic force is applied to the piston through a thrust bearing and a female screw member.
The friction between the female screw member and the first elastic member is reduced by the second thrust bearing. Thereby, when rotating the female screw member, the first elastic member is twisted, and it is avoided that the female screw member is reversed by the restoring force.
Further, the female screw member can be rotated easily.
(14) The inner diameter finishing machining according to any one of (2) to (13), wherein the holder main body has a coolant passage communicating with the cylinder bore and opening in the vicinity of the pre-machining blade and the finishing blade. Cutting tool holder.
Coolant is supplied to the cylinder bore and applied to the pre-cutting blade and the finishing blade. The coolant passage is provided in the holder main body and can supply the coolant from the vicinity of the blade. Even when the hole to be processed is a deep hole, the coolant can be sufficiently supplied.
(15) Item (1) to Item (14), comprising a chamfering blade tool attached to the holder main body on the proximal end side of the holder main body from the front working blade so as to protrude radially outward from the front working blade. The blade holder for inner diameter finishing processing according to any one of the above.
According to the holder of this section, chamfering is performed by the chamfering blade tool simultaneously with or after the end of the processing by the pre-processing blade. Three types of processing can be performed with one holder.
(16) a holder body provided with an attachment portion attached to the rotating tool spindle;
A blade-holding member held on the holder body so as to be relatively movable in a direction having a radial component of the holder body;
By operating the hydraulic pressure of the coolant supplied to the holder body and moving the blade holding member, the blade held by the blade holding member is moved to the first position and radially inward from the first position. A cutting tool holder for inner diameter processing, including a cutting tool moving device that moves to a retracted second position.
The configuration described in this section can be applied to the inner diameter finishing tool holder described in the above item (1), and can be applied to various inner diameter processing tool holders. For example, the cutting tool is positioned at the first position, the holder and the workpiece are moved in the first direction in the axial direction of the holder main body, the inner diameter processing is performed, and then the cutting tool is retracted to the second position to By moving the workpiece at a high speed in the second direction opposite to the first direction, it is possible to avoid a so-called “burl mark” on the inner peripheral surface of the processed hole. The blade moving device can be used as a so-called “retract mechanism”. Also, machining the entire inner peripheral surface of the hole with a cutting tool at the second position, and then moving the cutting tool to the first position to process a part of the inner peripheral surface of the hole, thereby processing a stepped hole. Can also be done. Furthermore, it is also possible to perform pre-processing in a state where the cutting tool is in the second position and move to the first position for finishing. The same cutting tool is used for pre-processing and finishing.
The features described in the items (1) to (15) are also applicable to the inner diameter machining tool holder of this item.
(17) The cutting tool holder for inner diameter processing according to (16), wherein the holder body is provided with a first cutting tool mounting portion, and the cutting tool holding member is provided with a second cutting tool mounting portion.
The positions of the first blade attachment portion and the second blade attachment portion in the axial direction and the radial direction of the holder body are determined in accordance with the intended use of the holder.
(18) The inner diameter machining blade holder according to (17), wherein the first blade attachment portion and the second blade attachment portion are provided at substantially the same position in the axial direction of the holder body.
The inner diameter machining tool holder of this item is suitable as the inner diameter finishing tool holder of the item (1). The pre-machining blade is attached to the first blade attachment portion, and the finishing blade is attached to the second blade attachment portion in a state satisfying the condition described in the above item (1).

  Embodiments of the claimable invention will be described below with reference to the drawings. In addition to the following examples, the claimable invention can be practiced in various modifications based on the knowledge of those skilled in the art, including the aspects described in the above [Aspect of the Invention] section. .

  FIG. 1 shows an inner diameter finishing tool holder that is an embodiment of the claimable invention. With this holder, the inner peripheral surface 14 of the cylinder bore 12 of the cylinder block 10 of the engine is finished. In this embodiment, the holder body 20 of the inner diameter finishing tool holder is formed by integrally assembling a plurality of members, and the mounting portion 22 provided at the rear portion thereof decreases in diameter toward the rear end. It has a tapered shaft shape. The attachment portion 22 is fitted into the rotating tool spindle 24 of the machining center, and the engagement notch 26 provided at the front end portion of the attachment portion 22 is fitted into the engagement protrusion 28 provided at the tip of the tool spindle 24. At the same time, the pull stud 29 projecting from the rear end of the mounting portion 22 is gripped by the draw bar, and the holder is attached to the tool spindle 24 so as not to be relatively rotatable but to be relatively movable in the axial direction. The engagement notch 26 and the engagement protrusion 28 each constitute an engagement part or a rotation transmission part.

  As shown in FIG. 3, a plurality of, in the present embodiment, two intermediate finishing blades 30 as pre-processing blades are spaced in the diameter direction at the front portion of the main body portion 31 protruding from the tool spindle 24 of the holder main body 20. In only two places, the holder body 20 is detachably fixed and protrudes radially outward from the outer peripheral surface of the holder body 20. The portion to which the intermediate finishing blade 30 of the holder body 20 is fixed constitutes the first blade attachment portion. Further, as shown in FIG. 1, a chamfering blade tool 32 is attached to a rear portion of the main body portion 31, which is closer to the base end side of the holder main body 20 than the intermediate finishing blade 30. At the same time, the opening end of the cylinder bore 12 is chamfered. The chamfering blade 32 is attached to the main body 31 in a state in which the chamfering blade 34 protrudes radially outward from the intermediate finishing blade 30.

  A slider 38 as a finishing blade holding member or a blade holding member is fitted to the front portion of the main body 31 so as to be relatively movable in the radial direction of the holder main body 20 to hold the finishing blade 40. In this embodiment, the slider 38 has a cylindrical shape as shown in FIGS. 1 and 2, and is perpendicular to the direction in which the two intermediate finishing blades 30 are arranged at the front of the holder body 20, and The axis passes through the holder body 20 in a state perpendicular to the axis of the holder body 20, and is fitted to the holder body 20 so as to be movable in the radial direction. It is detachably fixed by an appropriate fixing means and protrudes outward from the outer peripheral surface of the holder body 20. The slider 38 rotates together with the holder main body 20, and the finishing blade 40 is rotated around the axis of the holder main body 20 to perform processing. A portion of the slider 38 to which the finishing blade 40 is fixed constitutes a second blade attachment portion.

  The slider 38 is a kind of a plurality of, for example, two elastic members arranged between the plate 42 fixed to the end opposite to the side on which the finishing blade 40 is fixed and the holder body 20. The finishing blade 40 is urged in a direction of retreating inward in the radial direction of the holder body 20 by a compression coil spring 44 (see FIG. 3) as a spring member. As shown in FIGS. 1 and 3, the plate 42 is provided with a groove 45, and is fitted to a protrusion 46 provided perpendicular to the axis of the slider 38, so that the slider 42 rotates in the rotational direction. Positioned and fixed. Further, as shown in FIG. 1, a pair of planar engagement surfaces 47 perpendicular to the longitudinal direction of the groove 45 are provided on the outer surface of the plate 42, and the outer periphery of the holder body 20 is connected to the holder body 20. It is fitted in a groove 48 formed so as to penetrate in the direction perpendicular to the axis and the axis of the slider 38, thereby preventing the slider 38 from rotating with respect to the holder body 20. The groove 45, the protrusion 46, the engaging surface 47, and the groove 48 constitute an engaging portion or a rotation preventing portion, respectively, and constitute a relative rotation preventing mechanism. The plate 42 functions as a spring receiver and also functions as a relative rotation preventing member.

  Since the intermediate finishing blade 30 and the finishing blade 40 process the same part in the axial direction of the hole to be processed, the position in the axial direction is essentially the same. However, in the present embodiment, the intermediate finishing blade 30 is provided such that the cutting edge is positioned slightly ahead of the cutting edge of the finishing blade 40 in the direction parallel to the axis of the holder body 20. Even if the finishing blade 40 may be located at a position in contact with the inner peripheral surface 14 for some reason during processing by the intermediate finishing blade 30, the intermediate finishing blade 30 is placed in front of the finishing blade 40. This is to prevent the finishing blade 40 from coming into contact with and being damaged by the inner peripheral surface 14 that has not been subjected to the intermediate finishing since the peripheral surface 14 is processed.

  The slider 38 is moved in the axial direction thereof and in the radial direction of the holder body 20 by a finishing blade moving device 50 as a blade moving device. As shown in FIG. 1, the finishing blade moving device 50 includes a single acting cylinder 52, a movable bar 54 as a movable member, and a motion conversion mechanism 56. A fitting portion 60 having a circular cross-sectional shape is provided at an intermediate portion in the longitudinal direction of the movable bar 54, and the holder main body 20 has a fitting hole 62 formed around the axis thereof in the holder main body 20. It is fitted so as to be movable in a direction parallel to the axis. The movable bar 54 is fitted concentrically to the holder main body 20, and a drive unit 64 is provided at the front thereof. As shown in FIG. 3, the drive unit 64 has a pair of planar engagement surfaces 66 extending in a direction parallel to the axis of the holder body 20 and parallel to each other, and as shown in FIG. An inclined surface 68 that intersects the surface 66 and is inclined with respect to the axis of the holder body 20 is provided. In the present embodiment, the inclined surface 68 is provided on one side in the radial direction with respect to the axis of the holder body 20, and is inclined in a straight line so that the rear part of the holder body 20 approaches the axis of the holder body 20. The reverse inclined surface. Further, the surface of the drive unit 64 opposite to the inclined surface 68 is a partially cylindrical supported surface 70 located in the same cylindrical surface as the outer peripheral surface of the fitting unit 60.

  As shown in FIGS. 1 and 3, the drive unit 64 is fitted so as to be movable in a direction parallel to the axis of the holder body 20 through the slider 38. As shown in FIG. 3, the slider 38 is formed with an engagement hole 74 whose longitudinal cross-sectional shape is rectangular, penetrating in a direction parallel to the axis of the holder body 20. The engaging hole 74 has two side surfaces parallel to the axis of the slider 38 as engaging surfaces 76 parallel to the axis of the slider 38 and the axis of the holder body 20, and two side surfaces perpendicular to the axis of the slider 38. Are inclined surfaces 78 and 80 which are inclined with respect to the axis of the holder body 20.

  The inclined surfaces 78 and 80 are inclined so that the inclined surface 78 closer to the finishing blade 40 is closer to the axis of the holder body 20 toward the rear of the holder body 20. Have been the same. The drive unit 64 is fitted into the engagement hole 74 so that the two engagement surfaces 66 engage with the engagement surface 76 and the inclined surface 68 faces the inclined surface 78. As described above, the slider 38 is prevented from rotating with respect to the holder main body 20 by fitting into the groove 48 of the plate 42, and the phase is determined, so that the driving portion 64 can be easily fitted into the engaging hole 74. Can do. After the fitting, the engagement of the engagement surfaces 66 and 76 prevents the relative rotation of the movable bar 54 and the slider 38 and prevents the relative rotation of the movable body 54 and the holder body 20, as shown in FIGS. 2 and 3. As shown, the finishing blade 40 is positioned about the axis of the slider 38. The engagement surface 66 of the movable bar 54 and the engagement surface 76 of the slider 38, which are an engagement portion, a rotation prevention portion, or a positioning portion, respectively, constitute a relative rotation prevention mechanism or a rotation position positioning mechanism. The engagement surfaces 66 and 76 are also a rotation prevention mechanism that prevents the rotation of the male screw portion 116 that is a constituent member of the screw mechanism 112 described later.

  The supported surface 70 is supported on the inner peripheral surface of the fitting hole 62 from behind (from the side opposite to the inclined surface 68) in the portion of the driving unit 64 that protrudes forward from the slider 38. As will be described later, the movable bar 54 receives a force based on the cutting resistance from the slider 38 at the time of finishing, and the fitting to the fitting hole 62 of the fitting portion 60 and the fitting hole against the force. Due to the support of the drive unit 64 by the inner peripheral surface 62, it is held so as to be movable in the axial direction while being supported by the holder body 20 at two locations separated in the axial direction.

  The slider 38 is biased by the spring 44 in the direction in which the finishing blade 40 is retracted, and the inclined surface 78 provided on the same side as the finishing blade 40 with respect to the drive unit 64 is biased by the spring 44. It is engaged with an inclined surface 68 having the same inclination. In this embodiment, it can be considered that the portion of the slider 38 provided with the inclined surface 78 constitutes the engaging portion, and the portion of the movable bar 54 provided with the inclined surface 68 constitutes the engaging portion. You can also think that The inclined surfaces 68 and 78 are inclined with respect to the axis of the holder body 20 so as to approach the axis of the holder body 20 toward the rear, and when the movable bar 54 is advanced, the holder body 20 of the inclined surface 68 is moved forward. However, the slider 38 is moved in the radial direction of the holder main body 20 in the radial direction of the holder body 20 so as to keep the state where the inclined surface 78 is engaged with the inclined surface 68, and the finishing blade 40 is moved. It is moved in the backward direction. The spring 44 constitutes the finishing blade moving device 50 together with the movable bar 54 and the like.

  Further, if the movable bar 54 is retracted, the distance between the inclined surface 68 and the axis of the holder main body 20 becomes longer, and the finishing blade 40 moves outward in the radial direction of the holder main body 20 against the urging force of the spring 44. It is moved in the direction that protrudes. In the present embodiment, the inclined surfaces 68 and 78 constitute a motion conversion mechanism 56 that converts the movement of the movable bar 54 in the axial direction into the movement of the slider 38 in the radial direction. The distance between the inclined surfaces 78 and 80 of the engagement hole 74 is set such that a gap remains between the inclined surface 80 and the drive unit 64 and allows the drive unit 64 and the slider 38 to move. The side surface of the engagement hole 74 that faces the inclined surface 78 may be a surface that allows a distance allowing the drive unit 64 and the slider 38 to move relative to the inclined surface 78, and may be a surface other than the inclined surface. .

  The single acting cylinder 52 includes a piston 90 and a compression coil spring 92 which is a kind of spring as an elastic member. A cylinder bore 94 is formed around the axis of the holder body 20 in the rear part of the body part 31 and in the rear part of the holder body 20 and behind the part where the movable bar 54 is fitted. A piston 90 is fitted in a liquid-tight and slidable manner, and constitutes a single-acting cylinder 52 in cooperation with the holder body 20. The piston 90 and the movable bar 54 are provided concentrically and in series. The cylinder bore 94 is provided to open in the fitting hole 62, and a liquid chamber 96 formed between the bottom surface 95 perpendicular to the axis of the holder body 20 and the piston 90 is formed in the holder body 20. The coolant is connected to the coolant supply device 100 through a passage 98 and a passage 99 formed in the pull stud 24. The coolant pressure supplied to the fluid chamber 96 acts on the piston 90 from the rear, and the piston 90 is actuated by the coolant pressure and moved forward.

  A plurality of coolant passages 101 are also formed in the holder body 20 as shown in FIGS. 1 and 3. These coolant passages 101 are communicated with the passages 98 and 99, and are communicated with the cylinder bore 94, and the coolant injection holes 102, 104, and 106 are disposed in the vicinity of the two intermediate finishing blades 30 and the finishing blades 40, respectively. The coolant is supplied from the holder body 20.

  An adjusting mechanism 110 is provided between the movable bar 54 and the piston 90 so that the axial relative positions thereof are adjusted. If the relative position between the movable bar 54 and the piston 90 is adjusted, the position of the movable bar 54 when the finishing blade 40 is positioned at the finishing position, which is the first position, is changed, and the finishing position of the finishing blade 40 is adjusted. Is done. The adjustment mechanism 110 is configured in the same manner as the adjustment mechanism described in Japanese Utility Model Publication No. 7-53842, and will be briefly described.

  The adjustment mechanism 110 includes a screw mechanism 112 and a rotation mechanism 114. As shown in FIG. 1, the screw mechanism 112 includes a male screw portion 116 provided at the rear portion of the movable bar 54 and a female screw portion 118 screwed into the male screw portion 116, and is rotatably accommodated in the holder body 20. Nut 120 is included. The male screw member is formed integrally with the movable bar 54 and moves together with the movable bar 54. In the present embodiment, the male screw portion 116 and the female screw portion 118 are left-handed screws. The rotation of the movable bar 54 with respect to the holder main body 20 is prevented by the fitting of the drive unit 64 into the engagement hole 74, and the movement of the nut 120 in the axial direction during the relative position adjustment is described later. If it is prevented by the spring 92 and the nut 120 is rotated, the movable bar 54 is moved in the axial direction and the position with respect to the piston 90 is changed.

  As shown in FIGS. 1 and 4, the rotation mechanism 114 includes a first rotation mechanism unit 130 and a second rotation mechanism unit 132. The first rotation mechanism unit 130 includes a plus adjustment ratchet wheel 134, a minus adjustment ratchet wheel 136, a plus adjustment ratchet wheel drive unit 138, and a minus adjustment ratchet wheel drive unit 140. The second rotation mechanism unit 132 includes: As shown in FIGS. 1 and 2, a gear 144, a pinion 146, and an operation ring 148 are included.

  As shown in FIG. 1, the ratchet wheels 134 and 136 for plus adjustment and minus adjustment are provided integrally with the nut 120, and ratchet teeth are formed in opposite directions. The ratchet wheel drive units 138 and 140 for plus adjustment and minus adjustment have the same configuration, and the unit 140 will be described as a representative. As shown in FIG. 4, the minus adjustment ratchet wheel drive unit 140 includes a moving member 154 and a claw member 156. The moving member 154 is fitted in a bottomed fitting hole 158 formed in the holder main body 20 so as to be movable in a direction perpendicular to the axis of the holder main body 20 at a right angle, and the bottom surface of the fitting hole 158 Is urged toward the opening side of the fitting hole 158 by a spring 160 disposed between them. The movement of the moving member 154 by the urging of the spring 160 is such that a long hole 164 provided in the moving member 154 is fitted into a pin 162 as an engaging portion provided in the holder body 20, and an end surface thereof is pin 162. Is defined by engaging

  The claw member 156 is attached to the moving member 154 by a shaft 168 so as to be rotatable about an axis parallel to the rotation axis of the ratchet wheel 136, and is urged by a spring 170 to engage with the teeth of the ratchet wheel 136. ing. In a state where the moving member 154 is located at the moving end position by the bias of the spring 160 and at the retracted end position, the inclined engaging surface 172 provided on the claw member 156 is engaged with the pin 162, and the claw member 156 is engaged. Is rotated against the urging force of the spring 170 by the action of the slope, and is maintained at a position separated from the teeth of the ratchet wheel 136. The pin 162 and the engagement surface 172 constitute a claw detachment position holding device.

  The moving member 154 is brought into contact with an input member (not shown), and is moved forward against the urging force of the spring 160 by a driving member (not shown) such as a piston rod of an air cylinder. It is advanced to the forward end position where it contacts. On the way, the engaging surface 172 of the claw member 156 is disengaged from the pin 162, and the claw member 156 is engaged with the ratchet teeth by the bias of the spring 170. Rotate. The minus direction is a direction in which the movable bar 54 is advanced and the finishing blade 40 is retracted. If the drive member is retracted, the moving member 154 is retracted by the bias of the spring 160. At this time, the claw member 156 gets over the ratchet wheel 134 and does not rotate. When the nut 120 is rotated at an angle corresponding to a plurality of pitches, the moving member 154 is reciprocated a plurality of times by the driving member.

  The plus adjustment ratchet wheel drive unit 138 is provided at a position symmetrical to the minus adjustment ratchet wheel drive unit 140 with the nut 120 interposed therebetween. When the moving member 154 is moved to the forward end position, the nut 120 is provided. Is rotated by an angle of one pitch in the plus direction. The plus direction is a direction in which the movable bar 54 is retracted and the finishing blade 40 protrudes outward in the radial direction of the holder body 20.

  As shown in FIG. 1, the gear 144 of the second rotation mechanism unit 132 is provided integrally with the nut 120, and is provided in the holder body 20 so as to be rotatable around an axis parallel to the axis of the holder body 20. The pinion 146 is engaged with the pinion 146. The operation ring 148 as an operation member is a ring gear having teeth formed on the inner peripheral surface thereof. The operation ring 148 is fitted to the holder body 20 so as to be relatively rotatable and not relatively movable in the axial direction, and is engaged with the pinion 146. Yes. Between the operation ring 148 and the holder main body 20, two rubber O-rings 174 and 175 as frictional force generating members are provided at a distance in the axial direction, generating frictional force and operating The relative rotation of the ring 148 with respect to the holder body 20 is prevented, and the adjustment position is maintained. The O-rings 174 and 175 also function as dust seals. A scale 176 is provided on the outer peripheral surface of the operation ring 148. The operation ring 148 is rotated by an operator, whereby the pinion 146 is rotated, the gear 144 is rotated, and the nut 120 is rotated. The operator rotates the operation ring 148 by a desired amount in a plus or minus desired direction while looking at the scale 176. In FIG. 2, reference numeral 178 denotes a tool engagement hole as a tool engagement portion provided in the operation ring 148.

  In this way, the ratchet wheel drive units 138 and 140 are operated, or the operation ring 148 is operated, whereby the nut 120 is rotated and the movable bar 54 is moved forward or backward to adjust the relative position with the piston 90. Is done. At the time of adjustment by operating the operation ring 148, the ratchet wheels 134 and 136 are rotated with the rotation of the nut 120, but the claw member 156 is in the retracted end position and is not engaged with the ratchet wheels 134 and 136. The moving member 154 cannot be moved. When the relative position between the movable bar 54 and the piston 90 is adjusted by the operation of the first rotation mechanism unit 130, the operation ring 148 is rotated with the rotation of the nut 120, and the cutting edge of the finishing blade 40 with respect to the holder body 20. It is positioned at a rotation position corresponding to the position (finishing blade machining position). The rotation prevention mechanism for preventing the rotation of the male screw portion 116, the female screw portion 118, the first and second rotation mechanism portions 130 and 132, and the male screw portion 116 is provided symmetrically with respect to the axis of the holder body 20 in terms of mass. In addition, this holder has a cutting edge position adjustment function and is a holder having a good rotation balance.

  The spring 92 of the single acting cylinder 52 is provided in front of the piston 90 and the adjusting mechanism 110. As shown in FIG. 1, the nut 120 of the screw mechanism 112 is disposed between the spring 92 and the piston 90, and is brought into contact with the piston 90 indirectly through a thrust bearing 180 so as to be relatively rotatable. ing. The front end of the spring 92 is received by the holder body 20 via the spacer 182, and the rear end is brought into contact with the nut 120 via the spacer 184 and the thrust bearing 186, and the thrust bearings 180, 186. In addition, an elastic force is applied to the piston 90 via the spacer 184 and the nut 120 to urge the piston 90 backward. In addition, another nut 190 is screwed onto the male screw portion 116 with a spacer 192 sandwiched between the nut 120 and the teeth of the nuts 120 and 190 are engaged with tooth surfaces opposite to each other of the male screw portion 116. The backlash between the male screw part 116 and the nut 120 is removed. The nut 190 is a backlash removing nut, is fixed to the nut 120, and rotates together with the nut 120. Thus, the spring 92 biases the nut 120 toward the piston 90, and the nut 120 moves together with the piston 90. When adjusting the relative position of the movable bar 54 and the piston 90, the nut 120 is kept pressed against the bottom surface 95 via the piston 90 by the bias of the spring 92, and does not move in the axial direction but can be moved by its rotation. The bar 54 is moved, the relative position with the piston 90 is adjusted, and the finishing position of the finishing blade 40 is adjusted. In addition, the movable bar 54 can move in the axial direction together with the piston 90 via the screw mechanism 112 by screwing between the male threaded portion 116 provided integrally with the movable bar 54 and the female threaded portion 118 of the nut 120.

  The retreat limit of the piston 90 due to the bias of the spring 92 is defined by the piston 90 coming into contact with the bottom surface 95 of the cylinder bore 94. This position is the original position of the piston 90, and the bottom surface 95 constitutes a stopper. The piston 90 is advanced against the elastic force of the spring 92 if a hydraulic coolant is applied to the liquid chamber 96 to apply a force larger than the set load of the spring 92 to the piston 90. The forward end position of the piston 90 at this time is defined by the engagement surface 194 provided on the nut 120 contacting the stopper surface 196 provided at right angles to the axis of the holder body 20 in the holder body 20. The

  When the piston 90 is advanced against the biasing force of the spring 92, the movable bar 54 is integrally advanced via the screw mechanism 112, and the finishing blade 40 is retracted by the slider 38 by the biasing of the spring 44. It can be moved in the direction. In a state where the forward movement of the piston 90 is stopped by the stopper surface 196, as shown by a two-dot chain line in FIG. 5, the finishing blade 40 is in a retracted position as a second position that is retracted radially inward from the intermediate finishing blade 32. Be positioned.

  When the piston 90 is retracted by the bias of the spring 92, the movable bar 54 is retracted. In this case, the slider 38 is moved by the action of the motion conversion mechanism 56 in a direction in which the finishing blade 40 protrudes radially outward, and the piston 90 is located at the original position or the backward end position in contact with the bottom surface 95. Then, as shown by a solid line in FIG. 5, the finishing blade 40 is positioned at a finishing processing position protruding outward in the radial direction from the intermediate finishing blade 36. In this embodiment, the inclined surfaces 68 and 78 of the motion conversion mechanism 56 are inclined so as to move the finishing blade 40 to the finishing position by the retreat of the piston 90, and the piston 90 is moved by the motion conversion mechanism 56. While being held in the original position by the spring 92, the slider 38 is held at a position where the finishing blade 40 is located at the finishing position.

Next, the operation will be described.
When finishing the inner peripheral surface 14 of the cylinder bore 12 with a holder, the holder is advanced while being rotated by the rotation of the tool spindle 24 and is moved into the cylinder bore 12. At this time, the coolant is supplied to the liquid chamber 96, the piston 90 is advanced to the forward end position against the urging force of the spring 92, and the finishing blade 40 is retracted to the backward position to contact the inner peripheral surface 14. Not to be.

  Therefore, when the holder is advanced, the inner peripheral surface 14 is subjected to intermediate finishing by the intermediate finishing blade 30. The coolant is also supplied to the coolant passage 101 and ejected from the coolant ejection holes 102, 104, and 106, and the intermediate finishing blade 30 is cooled and lubricated. Simultaneously with the end of the intermediate finishing, the chamfering blade 34 chamfers the opening end of the cylinder bore 12. At the time of intermediate finishing, the finishing blade 40 is retracted to the retracted position, does not contact the inner peripheral surface 14, and no cutting resistance is applied, so that the coolant pressure sufficiently supplies the coolant to the coolant passage 101. In addition, the force that overcomes the set load of the spring 92 and causes the piston 90 to advance is applied to the piston 90.

  After machining, the hydraulic pressure of the coolant supplied to the liquid chamber 96 is such that the force acting on the piston 90 is smaller than the set load of the spring 92 and is high enough to supply the coolant to the finishing blade 40. Can be lowered. As a result, the piston 90 is retracted to the original position by the bias of the spring 92, and the finishing blade 40 is moved to the finishing position. In this state, the holder is rotated and retracted, and the finishing blade 40 finishes the inner peripheral surface 14. Although the coolant pressure is reduced, the coolant is supplied from the inside of the holder body 20 through the coolant injection hole 106 to the finishing blade 40, and is sufficiently cooled and lubricated. Although the hydraulic pressure of the coolant is lower than that at the time of intermediate finishing, the processing with the finishing blade 40 is lighter than the processing with the intermediate finishing blade 30 and generates less heat, so there is no problem.

  The inclined surface 78 is provided on the same side as the finishing blade 40 with respect to the drive unit 64, and the spring 44 urges the slider 38 in the same direction as the cutting resistance acting on the finishing blade 40 to cause the inclined surface 78 to move. The force applied to the slider 38 based on the cutting force acting on the finishing blade 40, which is engaged with the inclined surface 68, is a force for moving the finishing blade 40 backward from the finishing position. 78, and acts as a piston driving force for advancing the piston 90 from the original position via the movable bar 54 by the action of the inclined surfaces. In practice, a frictional force acts between the inclined surfaces 68 and 78, and this frictional force serves to prevent the movable bar 54 from moving in the axial direction. Since the vibration is transmitted and the frictional force may be significantly reduced by the vibration, the present embodiment is designed assuming that the frictional force does not act. That is, the set load of the spring 92 is set to a magnitude sufficient to keep the piston 90 in the original position against the piston driving force based on the cutting resistance. The finishing position is clearly defined by the position definition, and the piston 90 is maintained at the original position by the bias of the spring 92, so that the finishing blade 40 is stably positioned at the finishing position. Further, the force based on the cutting force applied to the slider 38 is rigidly received by the movable bar 54, and the fitting portion 60 is fitted into the fitting hole 62 and the driving portion 64 is driven by the inner peripheral surface of the fitting hole 62. By the support, the finishing blade 40 is firmly held at the finishing position by being rigidly received by the holder body 20.

  This embodiment has an advantage that the hydraulic pressure of the coolant for moving the piston 90 forward is low. The inclined surface of the movable member may be an inclined surface inclined in a direction closer to the axis of the holder body toward the front, and in this case, the finishing blade is moved to the finishing position by the advance of the piston by the supply of the coolant. The piston is positioned at the stroke end defined by the stopper by the force based on the hydraulic pressure, and the finishing blade is maintained in the finishing position. The force applied to the finishing blade holding member based on the cutting force acting on the finishing blade acts as a piston driving force that causes the piston to retreat from the forward stroke end, and its acting direction constitutes a single acting cylinder. Therefore, the hydraulic pressure of the coolant for advancing the piston must be large enough to obtain a force that exceeds the sum of the piston drive force and the spring set load. , Get higher. On the other hand, in the holder of the present embodiment, the finishing blade 40 is moved to the retracted position by the advancement of the piston 90, and no cutting resistance acts. Therefore, the hydraulic pressure of the coolant applies a force exceeding the set load of the spring 92 to the piston. The size can be small enough to act on 90, and can be low.

  When adjusting the position of the cutting edge due to wear of the finishing blade 40 or the like, the nut 120 is rotated by an operator operating the operation ring 148 or by driving the ratchet wheel drive units 138 and 140 by a driving member. The relative position between the bar 54 and the piston 90 is adjusted.

  As described above, even when the inclined surface of the movable member is an inclined surface that is inclined in a direction closer to the axis of the holder body toward the front, the piston is disposed in front of the spring, and the piston is disposed in the spring. If it is energized in the direction of moving forward, the finishing blade can be positioned at the finishing position with the piston held in place by the energizing spring, and the coolant pressure can be low. . However, in this case, for example, the piston is an annular piston, the annular piston is fitted to the outside of the member corresponding to the movable bar 54, and a seal member is provided at the fitting portion of both to maintain liquid tightness. It is unavoidable that the configuration becomes somewhat complicated.

  Further, in the above embodiment, the intermediate finishing process is performed when the holder moves forward, and the finishing process is performed when the holder moves backward, and the machining is performed more efficiently than when these processes are performed separately. However, the intermediate finishing process and the finishing process by the holder do not necessarily have to be performed at the time of forward movement and at the time of backward movement. For example, intermediate finishing and finishing may be performed when the holder moves forward. In this case, at the time of finishing, the holder is advanced with the finishing blade positioned in the finishing position in advance. . In any case, since machining is not performed at the time of reverse movement, it is reciprocated at high speed, so in order to avoid the so-called burr mark, a semi-finished blade or a finished blade is placed on the inner peripheral surface of the hole to be machined. It is desirable to move to a retract position that does not touch. For the finishing blade, the finishing blade holding member may be retracted with respect to the holder body. However, the intermediate finishing blade is fixed to the holder body, so the holder body itself needs to be decentered by a small amount. is there. At that time, if the arrangement of the intermediate finishing blade and the finishing blade is as shown in FIG. 3, the holder body 20 is eccentric toward the finishing blade 40 in order to separate the intermediate finishing blade 30 from the inner peripheral surface of the hole to be processed. As a result, the finishing blade 40 may come into contact with the inner peripheral surface of the hole to be processed. Accordingly, two intermediate finishing blades 30 are provided at positions moved from the state shown in FIG. 3 to the same side as the finishing blade 40 with respect to one diameter, so that the burr mark by the intermediate finishing blade 30 is not attached. If the two intermediate finishing blades 30 are separated from the inner peripheral surface of the hole to be processed, it is desirable that the finishing blade 40 is also separated from the inner peripheral surface of the hole to be processed.

  Furthermore, an engaging part may be provided in a movable member, and an inclined surface may be provided in a finishing blade holding member. For example, the movable member is convex on the inclined surface side, and the distance from the axis of the holder main body is smoothly changed in a direction parallel to the axis of the holder main body, so that the cross-sectional shape parallel to the axis of the holder main body is approximately A semicircular protrusion is provided as an engaging portion. An inclined surface may be provided on the movable member, and an engaging portion may be provided on the finishing blade holding member. The engaging portion is, for example, a protruding portion that protrudes toward the inclined surface, and can be, for example, a protruding portion similar to the protruding portion.

It is a front view (partial cross section) which shows the blade holder for internal diameter finishing which is one Example of claimable invention. It is a figure which shows the said internal diameter finishing tool holder in the part different from FIG. 1, Comprising: The part provided with the finishing blade. FIG. 3 is a side view showing the inner diameter finishing tool holder in a cross section at a portion where a finishing blade is provided, and is a cross-sectional view taken along line III-III in FIG. 1. FIG. 4 is a side view showing the inner diameter finishing cutting tool holder in cross section in a portion where a ratchet wheel and a ratchet wheel drive unit are provided, and is a cross-sectional view taken along line IV-IV in FIG. 1. It is a figure which shows the retreat position and finishing process position of the said finishing blade.

Explanation of symbols

  12: Cylinder bore 14: Inner peripheral surface 20: Holder body 22: Mounting portion 24: Tool spindle 30: Medium finishing blade 38: Slider 40: Finishing blade 44: Compression coil spring 50: Finishing blade moving device 52: Single acting cylinder 54: Movable bar 56: Motion conversion mechanism 68, 78: Inclined surface 90: Piston 92: Compression coil spring 94: Cylinder bore 95: Bottom surface

Claims (6)

A holder body having a mounting portion attached to a rotating tool spindle;
A pre-cutting blade attached to the holder body so as to protrude radially outward from the outer peripheral surface of the holder body;
A finishing blade,
A finishing blade holding member that holds the finishing blade and is held by the holder body so as to be relatively movable in a direction having a radial component of the holder body;
The finishing blade is moved by a hydraulic pressure of the coolant supplied to the holder body, and the finishing blade holding member is moved, so that the finishing blade protrudes radially outward from the front processing blade and the front processing blade. A blade holder for inner diameter finishing machining, comprising: a finishing blade moving device that moves to a retracted position that is further retracted. The finishing blade moving device is
A piston that is fluid-tightly and slidably fitted to a cylinder bore formed in the holder body, and that is operated by the hydraulic pressure of the coolant;
A movable member movable in the axial direction together with the piston;
The inner diameter finishing tool holder according to claim 1, further comprising: a motion conversion mechanism that converts an axial motion of the movable member into a motion in a direction having a radial component of the finishing blade holding member. .   A single-acting member that includes a first elastic member that urges the piston toward the original position, and the piston operates in cooperation with the holder main body against the elastic force of the first elastic member by the hydraulic pressure of the coolant; The cutter holder for inner diameter finishing according to claim 2, wherein the cutter comprises a cylinder.   The cylinder bore is formed around the axis of the holder body, the movable member is held by the holder body so as to be movable in a direction parallel to the axis of the holder body, and the finishing blade holding member moves in the radial direction of the holder body The blade holder for inner diameter finishing processing according to claim 2 or 3, wherein the holder body is held by the holder main body.   One of the movable member and the finishing blade holding member has an inclined surface inclined with respect to the axis of the holder body, and the other of the movable member and the finishing blade holding member engages with the inclined surface. The motion conversion mechanism includes the inclined surface and the engaging portion, and the finishing blade moving device attaches the finishing blade holding member in a direction in which the engaging portion and the inclined surface are engaged. The blade holder for inner diameter finishing processing according to claim 4, further comprising a second elastic member to be urged. A holder body having a mounting portion attached to a rotating tool spindle;
A blade-holding member held on the holder body so as to be relatively movable in a direction having a radial component of the holder body;
By operating the hydraulic pressure of the coolant supplied to the holder body and moving the blade holding member, the blade held by the blade holding member is moved to the first position and radially inward from the first position. A cutter holder for inner diameter machining, comprising: a cutter moving device that moves to a retracted second position.

Images