JP5120665B2 - Work machine with position correction function - Google Patents

Description

  The present invention relates to a work machine with a position correction function in which a tool is attached to a tool holder that can rotate integrally with a spindle.

  In general, various types of tools (work machines) that perform processing on a workpiece through a tool attached to a tool holder, for example, a processing tool, are used. For example, the boring of a cylinder constituting an engine block needs to be machined with high accuracy with an inner cylinder diameter of the order of microns.

  However, in an automobile engine, for example, when machining is performed with the same cutting edge in a mass production process, the cutting edge is worn even with a hard tool such as a CBN tool. Therefore, since the cutting edge of the tool has a reduced processing diameter due to wear, a correction tool holder having a correction function is employed so as to maintain a constant hole diameter.

  For example, a blade edge position adjusting device for a machine tool disclosed in Patent Document 1 is known. This patent document 1 is a machine tool that controls X, Y, and Z axis drive motors on a workpiece and performs machining with a cutting tool at the tip of a spindle. The spindle is rotatably supported by a spindle head. A tool holder is detachably attached to the tip of the tool holder, and the tool holder is rotatably provided with an adjustment shaft at a position eccentric from the spindle rotation axis. By rotating the adjustment shaft, the tool holder is rotated in the radial direction. In the machine tool configured to adjust the radial cutting edge position of the cutting tool provided so as to be displaceable, a rotation preventing member that engages with and disengages from the adjustment shaft is provided on the fixed side of the machine tool, and the spindle head is The X and Y axis drive motors are moved in the X and Y axis directions orthogonal to the spindle axis, and the spindle head is controlled in the X and Y axis directions while the adjustment shaft is locked to the rotation prevention member. And a control means for pivoting the spindle about the axis of the adjusting shaft.

  JP 2002-36009 A

  However, in said patent document 1, the slit is provided in the tool holder main body and it is comprised so that a blade edge | tip position may be adjusted by elastically deforming. For this reason, there exists a problem that the rigidity of tool holder itself falls.

  The present invention is a processing apparatus having a position correction function capable of maintaining a high rigidity and highly accurately correcting a tool attached to the tool holder in the radial direction of the tool holder with a micron order in this type of processing apparatus. The purpose is to provide a machine.

  The work machine with a position correction function according to the present invention includes a tool holder that can rotate integrally with a spindle. The tool holder includes: a base part fixed to a spindle; a tool attachment part to which a tool is attached; an elastic deformation part that connects the base part and the tool attachment part; and An operating shaft member that is movable in a radial direction intersecting a rotation direction of the spindle, a conversion mechanism that converts a moving operation of the operating shaft member into a tilting operation of the tool mounting portion with respect to the axial direction, and the operating shaft member. And a moving mechanism for moving in the radial direction.

  The elastically deforming portion communicates with the first and second through holes provided in parallel to each other in the radial direction, and extends outward in the radial direction and opens to the outside. First and second slits are provided.

On the other hand, the moving mechanism includes a hydraulic actuator having two first pistons provided at both ends of the operating shaft member, and a second piston having a smaller diameter than the first piston while communicating with the hydraulic actuator via a hydraulic path. provided, and a hydraulic pressure generating unit for moving the first piston in a radial direction under movement action of the second piston, the hydraulic actuator and the hydraulic pressure generating portion is disposed inside of the tool holder.

  Moreover, it is preferable that a base part, a tool attachment part, an elastic deformation part, an action | operation shaft member, a conversion mechanism, and a moving mechanism are provided in the same housing.

  Furthermore, it is preferable that a tool attachment part provides a flat attachment surface in the front-end | tip part to which a tool is attached.

  Furthermore, the hydraulic pressure generator is a pressure provided on the second piston for pressing the second piston from the outside of the tool holder and supplying a certain amount of oil to the hydraulic actuator under the moving action of the second piston. It is preferable that a spring for biasing the pressing portion toward the outside of the tool holder is provided.

  Furthermore, the hydraulic actuator has a first hydraulic chamber and a second hydraulic chamber formed by each first piston, and the hydraulic pressure generating unit communicates with the first hydraulic chamber via a first hydraulic path and operates. A first hydraulic pressure generating unit that moves the shaft member in one radial direction and a second hydraulic pressure chamber that communicates with the second hydraulic chamber via a second hydraulic path, and a second hydraulic shaft that moves the operating shaft member in the other radial direction. It is preferable to provide a hydraulic pressure generator.

  Furthermore, the first hydraulic chamber and the second hydraulic chamber communicate with the oil tank via the first hydraulic passage and the second hydraulic passage, and the first hydraulic passage includes the first hydraulic pressure generator. The second hydraulic path is preferably closed when the second hydraulic pressure generator is operated, while being closed when operated.

  Further, the conversion mechanism is provided on each first piston, and is inclined in a direction away from the tool mounting portion radially outward, and the tool mounting portion is opposed to the taper member. It is preferable to provide two contact members provided.

  Furthermore, it is preferable that a pressurizing screw for pressing each contact member against each taper portion is screwed into the tool attachment portion.

  Furthermore, the work machine includes an operation mechanism that operates the hydraulic pressure generating unit from the outside, and the operation mechanism includes a pressing member that presses the second piston, and a spring that biases the pressing member toward the second piston. It is preferable to comprise.

  The working machine is provided in the tool holder and is detachable from the position detection sensor for detecting the origin position of the operating shaft member and the tool holder, and receives the signal from the position detection sensor to receive the operating shaft. It is preferable to include a display unit that displays whether or not the member is arranged at the origin position.

  In the work machine with a position correction function according to the present invention, when the second piston constituting the hydraulic pressure generating unit is pressed (operated), the hydraulic pressure in the hydraulic pressure generating unit is increased. The pressurized hydraulic pressure is sent to a hydraulic actuator through a hydraulic path.

  In that case, the 1st piston which comprises a hydraulic actuator is set larger diameter than a 2nd piston. For this reason, an increase in hydraulic pressure due to the area ratio with the second piston acts on the first piston, and even if the second piston is pressed with a relatively small force, the hydraulic pressure is applied to the first piston. A great force acts through.

  Accordingly, even if a large frictional force is acting between the conversion mechanism and the elastic deformation portion, the conversion mechanism is reliably corrected and moved by a desired amount by pressing the second piston with a relatively small force. Can do. Thereby, while maintaining high rigidity, it becomes possible to position-correct the tool attached to the tool holder with high accuracy in the order of microns in the radial direction of the tool holder.

  It is a perspective explanatory view of a machine tool which is a work machine with a position correction function according to the first embodiment of the present invention.   It is principal part cross-sectional explanatory drawing of the said machine tool.   It is front sectional explanatory drawing of the tool holder which comprises the said machine tool.   It is another front cross-sectional explanatory drawing of the said tool holder.   It is explanatory drawing of the operation mechanism which comprises the said machine tool.   It is a side view explaining correction | amendment of a boring bar.   It is a front view explaining correction | amendment of the said boring bar.   It is operation | movement explanatory drawing of the correction | amendment by manual operation.   It is explanatory drawing at the time of confirming the movement amount of the said boring bar by correction | amendment operation | movement.   It is explanatory drawing of the original position detection structure of a tool holder.

  As shown in FIG. 1, a machine tool 10 that is a work machine with a position correction function according to a first embodiment of the present invention includes a main body portion 12, and a main shaft housing 14 is arranged in the X-axis direction on the main body portion 12. , Slidably mounted in the Y-axis direction and the Z-axis direction. As shown in FIG. 2, a spindle (main shaft) 16 is rotatably provided on the main shaft housing 14 via a bearing 18, and a tool holder (correction tool holder) 20 is detachably attached to the spindle 16. .

  The tool holder 20 includes a base portion 22 fixed to the spindle 16, a tool attachment portion 26 to which a tool, for example, a boring bar 24 is attached, and an elastic deformation that connects the base portion 22 and the tool attachment portion 26. An operation shaft member 30 movable in a radial direction (arrow A direction) intersecting the rotation direction of the spindle 16 with respect to the part 28, the tool holder 20, and the movement operation of the operation shaft member 30 with respect to the tool A conversion mechanism 32 that converts the mounting portion 26 into a tilting operation with respect to the axial direction (arrow B direction) and a moving mechanism 34 that moves the operating shaft member 30 in the radial direction are provided in the same housing 35. .

  The tool mounting portion 26 has a flat mounting surface 26a at the tip, and the flat surface 24a of the boring bar 24 is disposed in contact with the mounting surface 26a. The boring bar 24 is provided with a mounting inrow portion 24b and is fixed to the mounting surface 26a via a bolt (not shown).

  The elastic deformation portion 28 has first and second through holes 36a and 36b that are located in the vicinity of the diameter direction of the tool holder 20 and are provided in parallel to each other in the radial direction. The elastic deformation portion 28 is provided with first and second slits 38a and 38b that communicate with the first and second through holes 36a and 36b and extend outward in the radial direction and open to the outside.

  The operating shaft member 30 includes a rod portion 42 that is slidably fitted into a hole 40 that is formed through the small-diameter column body portion of the base portion 22 in a diametrical direction. Large-diameter pistons (first pistons) 44a and 44b are integrally formed at both ends of the rod portion 42 in the direction of arrow A.

  The conversion mechanism 32 includes tapered members 46a and 46b provided on one end side of the large-diameter pistons 44a and 44b. The tapered members 46a and 46b have tapered surfaces 48a and 48b that are inclined by the same angle in the direction away from the tool mounting portion 26 in the radially outward direction.

  Two contact members 50a and 50b are disposed on the tool mounting portion 26 so as to face the taper members 46a and 46b, and a pressurizing screw 51a that presses the contact members 50a and 50b against the taper members 46a and 46b. , 51b are screwed together.

  As shown in FIGS. 3 and 4, the moving mechanism 34 includes a hydraulic cylinder portion (hydraulic actuator) 52 having large-diameter pistons 44 a and 44 b provided on the operating shaft member 30. In the hydraulic cylinder portion 52, a first hydraulic chamber 52a and a second hydraulic chamber 52b are formed by large-diameter pistons 44a and 44b. The first hydraulic chamber 52a communicates with the first hydraulic pressure generator 56a via the first hydraulic path 54a, while the second hydraulic chamber 52b is connected to the second hydraulic pressure generator 54a via the second hydraulic path 54b. It communicates with 56b.

  As shown in FIG. 4, the first hydraulic pressure generator 56a has a small-diameter piston (second piston) 58a having a smaller diameter than the large-diameter piston 44a. A push button (pressing part) 60a for pressing the small diameter piston 58a is provided. A return spring 62a that urges the push button 60a toward the outside of the tool holder 20, that is, the original position where the stopper 61a is provided, abuts the push button 60a. When the push button 60a abuts against the stop end surface 63a, the inward movement distance is restricted, and the amount of oil pushed in by one advance / retreat operation is reliably adjusted.

  The first hydraulic chamber 52a and the second hydraulic chamber 52b communicate with the oil tank 66 through the first hydraulic passage 64a and the second hydraulic passage 64b. The first hydraulic path 64a is closed when the first hydraulic pressure generator 56a is operated, while the second hydraulic path 64b is closed when the second hydraulic pressure generator 56b is operated. . The first hydraulic path 64 a and the second hydraulic path 64 b merge with the third hydraulic path 64 c and then communicate with the oil tank 66.

  A check valve 68a is disposed in the first hydraulic path 54a to prevent backflow of oil from the oil tank 66, and a backflow to the oil tank 66 is blocked in the second hydraulic path 54b. For this purpose, a check valve 68b is provided. The oil tank 66 forms a tank chamber 74 through a slidable sliding wall 72 that is urged by a spring 70.

  The second hydraulic pressure generator 56b is configured in the same manner as the first hydraulic pressure generator 56a described above, and the same reference numerals are assigned to the same reference numerals and the detailed description thereof is omitted. To do.

  As shown in FIG. 1, an operation mechanism 80 for operating the first and second hydraulic pressure generators 56 a and 56 b from the outside is provided outside the tool holder 20. As shown in FIG. 5, the operating mechanism 80 has a housing 84 mounted on a support plate member 82, and a pressing rod (pressing member) 86 for pressing the small-diameter pistons 58a and 58b is disposed in the housing 84. Is done. A spring 88 is provided in the housing 84 to urge the pressing rod 86 toward the small diameter pistons 58a and 58b. A flange 90 is formed at the rear end of the pressing rod 86, and a proximity sensor 92 that detects the flange 90 is attached to the support plate member 82.

  The operation of the machine tool 10 according to the first embodiment configured as described above will be described below.

  First, the first hydraulic chamber 52a and the second hydraulic chamber 52b, the first hydraulic passage 54a and the second hydraulic passage 54b, the first hydraulic passage 64a to the third hydraulic passage 64c, and the oil tank 66 are provided. Each is filled with oil. When the cutting edge of the boring bar 24 is worn, the position of the boring bar 24 is adjusted (corrected) radially outward via the conversion mechanism 32.

  Specifically, as shown in FIG. 4, when the push button 60a constituting the first hydraulic pressure generator 56a is pressed in the direction of the arrow C1, the hydraulic pressure in the first hydraulic path 54a increases, and the hydraulic pressure Oil is supplied to the first hydraulic chamber 52 a of the cylinder portion 52. In the hydraulic cylinder portion 52, the large-diameter piston 44a is set to have a sufficiently large area compared to the small-diameter piston 58a, and the large-diameter piston 44a has a volume integral of the amount of oil pushed in by the hydraulic pressure increased by the area ratio. Only moves in the direction of arrow A1.

  On the other hand, the large diameter piston 44b moves in the direction of the arrow A1 integrally with the large diameter piston 44a. For this reason, the volume of the second hydraulic chamber 52b is reduced, the hydraulic pressure in the second hydraulic chamber 52b is increased, and the oil in the second hydraulic chamber 52b flows from the second hydraulic passage 64b to the third hydraulic pressure. The oil is introduced into the oil tank 66 through the path 64c.

  At this time, the first hydraulic passage 64 a communicating with the first hydraulic chamber 52 a is closed by the small diameter piston 58 a, so that the first hydraulic chamber 52 a is blocked from the oil tank 66. For this reason, it is possible to prevent the hydraulic pressure from being released from the first hydraulic chamber 52a.

  When the large-diameter piston 44a moves in the arrow A1 direction, the operating shaft member 30 attached to the tool holder 20 moves in the radial direction (arrow A1 direction) together with the large-diameter piston 44a.

  As shown in FIG. 6, the conversion mechanism 32 connected to the end of the operating shaft member 30 moves in the direction of the arrow A <b> 1, and the tapered surfaces 48 a and 48 b of the tapered members 46 a and 46 b constitute the tool attachment portion 26. The sliding contact is made with the contact members 50a and 50b. Here, the tapered surfaces 48a and 48b are inclined by the same angle in the direction away from the tool attachment portion 26, respectively.

  Accordingly, the contact member 50a moves in the arrow B1 direction, while the contact member 50b moves the same distance in the arrow B2 direction. As a result, the tool mounting portion 26 elastically deforms the tip of the boring bar 24 from the central axis O to the eccentric axis O1, and the boring bar 24 moves radially outward to increase the machining diameter.

  As shown in FIG. 3, when the pushing force to the push button 60a is released, the small-diameter piston 58a returns to the original position (position that contacts the stopper 61a) by the elastic force of the return spring 62a. Here, in the first hydraulic path 54a, the hydraulic pressure in the first hydraulic path 54a and the first hydraulic chamber 52a is temporarily reduced in order to draw back the amount of oil sent to the first hydraulic chamber 52a.

  On the other hand, in the oil tank 66, the inside of the tank chamber 74 is maintained at a constant hydraulic pressure under the biasing action of the spring 70. Accordingly, when the hydraulic pressure in the first hydraulic path 54a decreases, the check valve 68a is opened, so that the oil in the oil tank 66 is supplied to the first hydraulic path 54a and the first hydraulic chamber 52a. Further, the first hydraulic path 54a and the first hydraulic chamber 52a communicate with the first hydraulic path 64a closed by the small diameter piston 58a, and communicate with the oil tank 66 through the third hydraulic path 64c. Thereby, the pressure balance in the hydraulic system returns to the original state, and one correction operation is completed.

  As shown in FIG. 6, the elastic deformation portion 28 has a sufficiently high spring constant, and in a state where the elastic deformation has occurred, the large-diameter piston 44a has a tapered surface 48a of the taper member 46a integrated therein. And the contact member 50a, and the outer peripheral surface of the large-diameter piston 44a and the inner peripheral surface of the hydraulic cylinder portion 52 are securely held by a strong gripping force. For this reason, the large-diameter piston 44a has a high hydraulic pressure generated by pushing the small-diameter piston 58a, and has an action of self-holding the state after sliding in the direction of the arrow A1.

  When it is necessary to further expand the tool holder 20 to an appropriate position, as described above, the small-diameter piston 58a is pushed a predetermined number of times and the tip position of the tool holder 20 is moved and shifted, and then machining is started. do it.

  Here, for example, the outer diameter of the small-diameter piston 58a is 3 mm (diameter), the outer diameter of the large-diameter piston 44a of the operating shaft member 30 is 35 mm (diameter), and the outer diameter of the shaft portion of the operating shaft member 30 is 10 mm (diameter). And When the small-diameter piston 58a is further pushed by 1 mm after blocking the first hydraulic path 54a and the third hydraulic path 64c, an oil amount of 7 cubic mm is sent to the first hydraulic chamber 52a. . Since the pressure receiving area of the piston portion is 884 square mm, the large diameter piston 44a slides by 0.008 mm in the arrow A1 direction.

  When the taper angle of the taper surfaces 48a and 48b is 1/30, the contact member 50a incorporated in the tool mounting portion 26 is displaced (pulled) by 0.00026 mm in the arrow B1 direction (axial direction), while the contact member 50b. Is displaced by 0.00026 mm in the direction of the arrow B2 (axial direction) (compression). For example, when the arrangement pitch of the contact members 50a and 50b is 50 mm and the protruding position of the tool holder 24 from the elastically deforming portion 28 is 100 mm, when the small-diameter piston 58a is pushed once, the tool holder 24 is 0.001 mm ( A diameter expansion of 0.002 mm) is obtained. In this way, the tool holder 24 performs blade edge adjustment on the micron order with high accuracy.

  Furthermore, in the first embodiment, the area ratio of the small diameter piston 58a and the large diameter piston 44a is 125 times. Therefore, for example, when the small diameter piston 58a is pushed with a force of 30N, the acting force for pushing out the large diameter piston 44a is increased to 3750N. Moreover, since this power is increased and expanded at a taper ratio of 1/30 of the taper member 46a in the conversion mechanism 32, sufficient power for forcibly expanding the elastic deformation portion 28 can be obtained.

  Further, when the tool holder 24 is returned inward in the radial direction, as shown in FIG. 7, the push button 60b constituting the second hydraulic pressure generator 56b is pressed in the direction of the arrow C1. For this reason, the oil in the second hydraulic path 54 b is supplied to the second hydraulic chamber 52 b of the hydraulic cylinder portion 52.

  At this time, the second hydraulic passage 64 b communicating with the second hydraulic chamber 52 b is closed by the small diameter piston 58 b, so that the second hydraulic chamber 52 b is blocked from the oil tank 66. Moreover, since the hydraulic pressure in the second hydraulic path 54b is higher than the hydraulic pressure in the oil tank 66, the check valve 68b is closed. Therefore, the pressure of the oil pressed by the operation of the small diameter piston 58b rises in the second hydraulic path 54b and the second hydraulic chamber 52b.

  Here, the large-diameter piston 44b is held with a cooperative elastic force between the tool mounting portion 26 and the base portion 22, but the large-diameter piston 44b has a sufficiently large area compared to the small-diameter piston 58b. Is set to As a result, a very high hydraulic pressure that is increased by the area ratio is generated in the second hydraulic chamber 52b, and the large-diameter piston 44b moves in the direction of the arrow A2 by the amount of accumulated oil. When the large diameter piston 44b moves in the arrow A2 direction, the integral large diameter piston 44a similarly moves in the arrow A2 direction via the rod portion.

  At this time, the volume of the first hydraulic chamber 52a is reduced by the movement of the large-diameter piston 44a. Since the oil in the first hydraulic chamber 52a is introduced into the oil tank 66 through the first hydraulic path 54a, the first hydraulic path 64a, and the third hydraulic path 64c, the movement of the large-diameter piston 44b. Will not be disturbed.

  As shown in FIG. 6, the conversion mechanism 32 connected to the end of the operating shaft member 30 moves in the direction of the arrow A <b> 2, and the tapered surfaces 48 a and 48 b of the tapered members 46 a and 46 b constitute the tool attachment portion 26. The sliding contact is made with the contact members 50a and 50b. Therefore, the contact member 50a moves in the arrow B2 direction, while the contact member 50b moves the same distance in the arrow B1 direction. Thereby, the tool attachment portion 26 is forcibly returned from the elastically deformed state, and the tip end of the boring bar 24 moves from the eccentric axis O1 to the central axis O side (radius inward) to reduce the machining diameter. .

  When the pushing force to the push button 60b is released, as shown in FIG. 4, the small-diameter piston 58b returns to the original position (position where it abuts against the stopper 61b) by the elastic force of the return spring 62b. Here, due to the return operation of the small diameter piston 58b, the amount of oil sent to the second hydraulic chamber 52b is about to be pulled back in the second hydraulic path 54b, and the second hydraulic chamber 52b and the second hydraulic path 54b. The hydraulic pressure drops temporarily.

  On the other hand, in the oil tank 66, the inside of the tank chamber 74 is maintained at a constant hydraulic pressure under the biasing action of the spring 70. Therefore, when the hydraulic pressure in the second hydraulic path 54b decreases, the check valve 68b is opened, so that the oil in the oil tank 66 is supplied to the second hydraulic chamber 52b and the second hydraulic path 54b. Further, the second hydraulic path 54b and the second hydraulic chamber 52b communicate with the second hydraulic path 64b closed by the small-diameter piston 58b, and communicate with the oil tank 66 through the third hydraulic path 64c. Thereby, the pressure balance in the hydraulic system returns to the original state, and one correction operation is completed.

  The first hydraulic pressure generator 56 a and the second hydraulic pressure generator 56 b are automatically operated by the operation mechanism 80 in accordance with program control (NC control) of the machine tool 10. The spindle 16 of the machine tool 10 can lock the rotation of the tool holder 20 at a specific phase by an orientation function.

  Therefore, during the orientation, the axial movement direction of the small-diameter piston 58a or 58b of the tool holder 20 and the sliding shaft of the pressing rod 86 are installed in the same direction, and any one of the push buttons 60a and 60b of the tool holder 20 The pressure rod 86 is set to be pushed.

  Since the first hydraulic pressure generator 56a and the second hydraulic pressure generator 56b are controlled in the same manner, only the first hydraulic pressure generator 56a will be described below, and the second hydraulic pressure generator 56b Description is omitted.

  Here, in order to perform the plus correction operation (the diameter expansion correction operation) by automatic operation, after orientation, as shown in FIG. 5, the axis of the small diameter piston 58a and the axis of the pressing rod 86 are aligned by NC control, and the tool The holder 20 is moved in the arrow X1 direction. The push rod 86 abuts on the push button 60a, is pushed in until the push button 60a abuts on the stop end surface 63a, and pushes the small-diameter piston 58a provided at the tip to the stroke end. As a result, a certain amount of oil is pushed in and positive correction is performed.

  At that time, the rear of the pressing rod 86 is supported by a spring 88. The spring 88 has a sufficiently strong rigidity against the sliding action force of the small diameter piston 58a. For this reason, the small diameter piston 58a can be pushed in to the stroke end. On the other hand, when the tool holder 20 slides in the direction of the arrow X1 beyond the stroke end due to a program error or the like, the spring 88 is contracted to absorb the forcing force. Therefore, even if there is a program mistake or the like, the spring 88 functions as a safety valve, so that the collision between the tool holder 20 and the pressing rod 86 can be absorbed.

  Further, the pressing rod 86 and the spring 88 can be used as an automatic correction operation check. In this embodiment, the tool holder 20 is pushed in the direction of the arrow X1 until the push button 60a comes into contact with the stop end surface 63a, and further pushed by a certain amount (distance L). As a result, the spring 88 is reduced, and the flange 90 of the pressing rod 86 reaches the sensing area of the proximity switch 92. By confirming the operation of the proximity switch 92, it can be confirmed that the correction operation has been performed reliably.

  Furthermore, it is also possible to control the first hydraulic pressure generating unit 56a (the same applies to the second hydraulic pressure generating unit 56b) by manual operation. As shown in FIG. 8, the push button 60a on the side surface of the tool holder 20 is pushed from the standby state (no load state) position determined by the action of the return spring 62a and the stopper 61a to the stroke end in the direction of arrow D. The amount of hydraulic oil is determined. The manual correction operation is performed by pressing the push button 60a using a T wrench or the like and a long and narrow arbor T or the like.

  The hydraulic oil amount and the correction movement amount (= inching amount) have a correlation, and the correction amount is determined by the product of the amount that moves each time the small-diameter piston 58a is pressed and the number of times it is pressed. For example, if the correction amount is moved by 2 μm (diameter) with a single push, the push button 60a may be pressed three times to correct 6 μm (diameter).

  Further, as shown in FIG. 9, when the tool holder 20 is placed on the tool presetter 94 and the dial gauge 96 is disposed on the cutting edge of the boring bar 24, the push button 60a or 60b is pressed to perform the correction operation. The amount of movement of the boring bar 24 is confirmed.

  That is, when the tool holder 20 is placed on the tool presetter 94 and the preset work of the machining diameter is performed, the push buttons 60a and 60b can be easily pushed by a human hand with a light force. This is very convenient.

  By the way, when the tool holder 20 is preset, it is preferable that an accurate mark position (so-called original position) serving as a reference for starting the correction movement is provided. In managing only the number of times the push buttons 60a and 60b are pushed, if the correction movement is repeated many times, the starting position may be changed little by little, and there is a possibility that the starting position is deviated.

  As shown in FIG. 10, the machine tool 10 is provided in the tool holder 20 and is detachably attached to the tool holder 20 and micro switches (position detection sensors) 100 a and 100 b that detect the origin position of the operating shaft member 30. And a portable lamp unit (display unit) 102 that receives signals from the micro switches 100a and 100b and displays whether or not the operating shaft member 30 is located at the origin position.

  Insulators 104a and 104b having a planar contact surface are provided on the side surface of the tool holder 20, and two conductive contact pins 106a and 106b are embedded in the insulators 104a and 104b. Two electric wires 108a and 108b are taken out from the contact pins 106a and 106b, respectively, and connected to two terminals of the micro switches 100a and 100b which are also mounted in the tool holder 20.

  The micro switches 100a and 100b are provided with contact ends 110a and 110b. The contact ends 110a and 110b come into contact with the operation limit detection ends 111a and 111b incorporated in the outer periphery covering portion 109 when the operation shaft member 30 reaches the vicinity of the stroke limit of the radial operation. The micro switches 100a and 100b can be turned on / off in units of microns.

  The lamp unit 102 has a flat surface facing the insulators 104a and 104b. The lamp unit 102 includes a dry battery 112, an LED lamp 114, and two sliding pins 116 connected by electric wires (not shown). Is provided. The sliding pin 116 can be advanced and retracted via a spring 118. The lamp unit 102 is held in a state where the slide pin 116 and the contact pin 106a or the contact pin 106b are in close contact with the side surface of the tool holder 20 via the magnet 120.

  In such a configuration, when the operating shaft member 30 of the tool holder 20 moves in the direction of the arrow A2 and reaches the correction start position, the contact end 110b of the microswitch 100b moves in the direction of the arrow A2 and moves to the microswitch 100b. The contact end 110b contacts the operation limit detection end 111b and is turned on. For this reason, the electrical circuit of the portable lamp unit 102 can be electrically coupled, and the LED lamp 114 is lit. By this lighting, the start position can be confirmed accurately.

  On the other hand, when the operating shaft member 30 of the tool holder 20 moves in the direction of the arrow A1, the micro switch 100b is turned off and the LED lamp 114 is turned off. Thus, the start position can be accurately confirmed from the outside by turning the LED lamp 114 on and off.

10. . . Machine tool 16. . . Spindle 20. . . Tool holder 22. . . Base 24. . . Boring bar 26. . . Tool mounting portion 28. . . Elastic deformation part 30. . . Operating shaft member 32. . . Conversion mechanism 34. . . Movement mechanism 44a, 44b. . . Large diameter pistons 46a, 46b. . . Tapered members 48a, 48b. . . Tapered surfaces 50a, 50b. . . Contact member 52. . . Hydraulic cylinder parts 52a, 52b. . . Hydraulic chambers 54a, 54b. . . Hydraulic path 56a, 56b. . . Oil pressure generators 58a, 58b. . . Small diameter pistons 60a, 60b. . . Push buttons 62a, 62b. . . Return springs 64a to 64c. . . Hydraulic path 66. . . Oil tanks 68a, 68b. . . Check valve 70. . . Spring 80. . . Operating mechanism 86. . . Press rods 100a, 100b. . . Micro switch 102. . . Lamp unit

Claims (10)

A tool holder that can rotate integrally with the spindle,
The tool holder includes a base portion fixed to the spindle,
A tool mounting part to which the tool is mounted;
An elastically deforming portion connecting the base portion and the tool mounting portion;
An operation shaft member movable in a radial direction intersecting the rotation direction of the spindle with respect to the tool holder;
A conversion mechanism for converting the movement operation of the operating shaft member into a tilting operation of the tool mounting portion with respect to the axial direction;
A moving mechanism for moving the operating shaft member in the radial direction;
With
The elastic deformation portion includes first and second through holes provided in parallel to each other in the radial direction,
First and second slits communicating with the first and second through holes and extending outward in the radial direction and opened to the outside,
While providing
The moving mechanism includes a hydraulic actuator having two first pistons provided at both ends of the operating shaft member;
A hydraulic pressure generating portion that communicates with the hydraulic actuator via a hydraulic path, and that has a second piston having a smaller diameter than the first piston, and moves the first piston in the radial direction under the movement of the second piston. When,
Equipped with a,
The hydraulic actuator and the hydraulic pressure generating unit, a position correction function working machine, characterized in Rukoto is disposed within the tool holder.   The work machine according to claim 1, wherein the base part, the tool attachment part, the elastic deformation part, the operating shaft member, the conversion mechanism, and the moving mechanism are provided in the same housing. Work machine with compensation function.   The work machine according to claim 1, wherein the tool attachment portion is provided with a flat attachment surface at a tip portion to which the tool is attached. The work machine according to any one of claims 1 to 3, wherein the hydraulic pressure generation unit presses the second piston from the outside of the tool holder to move a certain amount of oil under a moving action of the second piston. In order to supply the hydraulic actuator to the hydraulic actuator,
A spring for urging the pressing portion toward the outside of the tool holder;
A work machine with a position correction function. The work machine according to any one of claims 1 to 4, wherein the hydraulic actuator includes a first hydraulic chamber and a second hydraulic chamber formed by the first pistons,
The hydraulic pressure generating unit communicates with the first hydraulic pressure chamber via the first hydraulic pressure path, and moves the operating shaft member in one of the radial directions.
A second hydraulic pressure generating portion that communicates with the second hydraulic pressure chamber via the second hydraulic pressure path and moves the operating shaft member in the other radial direction;
A work machine with a position correction function. 6. The work machine according to claim 5, wherein the first hydraulic chamber and the second hydraulic chamber communicate with an oil tank through the first hydraulic passage and the second hydraulic passage,
While the first hydraulic path is closed when the first hydraulic pressure generator is operated,
The work machine with a position correction function, wherein the second hydraulic path is closed when the second hydraulic pressure generator is operated. The work machine according to any one of claims 1 to 6, wherein the conversion mechanism is provided on each of the first pistons, and is inclined in a direction away from the tool mounting portion in a radially outward direction. Two taper members;
Two contact members provided on the tool mounting portion so as to face the tapered member;
A work machine with a position correction function.   8. The work machine according to claim 7, wherein a pressurizing screw that presses each contact member against each taper portion is screwed into the tool attachment portion. The work machine according to any one of claims 1 to 8, further comprising an operation mechanism for operating the hydraulic pressure generating unit from outside.
The operating mechanism includes a pressing member that presses the second piston,
A spring for urging the pressing member toward the second piston;
A work machine with a position correction function. In the work machine according to any one of claims 1 to 9, a position detection sensor that is provided in the tool holder and detects an origin position of the operation shaft member;
A display unit that is detachable from the tool holder, and displays whether or not the operating shaft member is disposed at an origin position in response to a signal from the position detection sensor;
A work machine with a position correction function.

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