JP3621043B2 - Inclined hole machining method with NC lathe, NC lathe for inclined hole machining, and inclined hole machining chuck used for NC lathe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is inclined hole drilling process for machining an inclined hole in the processing unit by using the NC lathe, about the inclined drilling chuck which is used to tilt drilling NC lathes and NC lathe.
[0002]
[Prior art]
In an NC lathe for machining bar workpieces, a main spindle, a main spindle, a tool post, and a rear main spindle mounted with a rear main spindle are sequentially arranged on a bed. The main shaft has a horizontal shaft, and can receive the bar workpiece fed from the head stock slidably on the common shaft, rotate it, and stop it at a predetermined position in the rotation direction when necessary. The back spindle head is a vertical axis that is so that the axis of the back spindle is parallel to the axis of the spindle, the back spindle is in the axial direction, and in a vertical plane including the axis of the spindle, and perpendicular to the axis of the back spindle It can be moved two-dimensionally in two directions. The tool post is between the main spindle and the rear main spindle, and is in a plane defined by two axes, a horizontal axis perpendicular to or perpendicular to the principal axis and a vertical axis perpendicular to or perpendicular to the principal axis. Can be moved two-dimensionally.
[0003]
Conventionally, in NC lathes, a hole with a center line inclined from the center line to the machined part of a bar workpiece that has been fed from the spindle (hereinafter referred to as an “inclined hole”). In this case, a chuck (for example, a collet chuck) having an axis coaxial with the center line of the processing portion gripping surface is used. Therefore, when drilling holes, drilling tools such as drills must be attached to the turret so that the drill feed direction matches the inclination angle of the inclined holes, making it easy to secure the inclination angle. In addition to this, there is a problem that it takes a lot of man-hours to mount the tool and the drilling tool must be replaced with the tool post each time the machining is performed at different inclination angles.
[0004]
Furthermore, in the conventional case, in order to form such an inclined hole, since the rotation of the back spindle has to be stopped and the drilling tool must be rotated, all the drilling tools are rotated, and the drilling tool is placed on the tool post. A rotating mechanism that rotates each of them appropriately must be used, and the structure of the NC lathe could not be simplified and the cost could not be reduced for forming the inclined hole. In addition, the back spindle is usually rotatable. However, since the processed portion is gripped coaxially with the back main shaft, the inclined hole cannot be processed if the processed portion is rotated. Therefore, it has been necessary to stop the rotation of the back spindle and stop the rotation of the machining part, and instead rotate the drilling tool. Therefore, there has been a problem that the precious function of rotating the back spindle cannot be utilized.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to form a desired inclined hole in a machining portion by simply fixing each drilling tool to a tool post so as to be oriented parallel to the axial direction of the main shaft without tilting with respect to the axial direction of the main shaft. An object of the present invention is to provide an inclined hole machining method using an NC lathe that can be opened, an inclined NC machining lathe, and an inclined hole machining chuck used for an NC lathe. Furthermore, an inclined lathe drilling method using an NC lathe that improves machining efficiency and reduces costs by machining an inclined hole by rotating the back spindle without rotating the drilling tool, an NC lathe for inclined hole machining, and an NC lathe. An object of the present invention is to provide a chuck for machining an inclined hole.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the inclined hole machining method using an NC lathe according to the present invention includes the following steps.
[0007]
First, the processed part of the bar workpiece that has been drawn out from the main shaft by a predetermined length is inclined substantially equal to the inclination angle formed by the center line of the processed part and the center line of the inclined hole to be formed in the processed part.
[0008]
A chuck in which a cylindrical processing portion gripping surface whose center line is substantially inclined by the inclination angle with respect to its own axis is formed with the direction of the axis parallel to the axis of the main axis and the direction of this parallel axis. The machined part is machined by fitting it coaxially to the back spindle that can be moved two-dimensionally in two directions, perpendicular to the machine, and making the center line of the processing part gripping surface substantially coincide with the center line of the processing part. Grip on the gripping surface. Thereafter, the processed part is cut from the bar workpiece. At this time, the drilling tool is set so that the drilling feed direction thereof coincides with the center line of the processing part gripping surface, and consequently the center line of the processing part gripped by the drilling tool.
[0009]
Next, the drilling tool and the chuck are rotated relative to each other about the axis of the back main shaft, and the drilling tool is relatively inserted along the center line in the processing portion to form an inclined hole. The machining part is released from the chuck of the back spindle, and one cycle of the inclined hole machining process of the product with the inclined hole is completed.
[0010]
It is desirable to groov the neck of the processed portion to a predetermined diameter to such an extent that the processed portion can be inclined at a desired angle.
[0011]
Furthermore, it is highly desirable to provide the drilling tool non-rotating and rotating the chuck about its axis.
An inclined hole machining chuck used in an inclined hole machining method using an NC lathe according to the present invention forms a machined portion of a bar workpiece, which is drawn out from a main shaft by a predetermined length, on the center line of the machined portion and the machined portion. Tilted substantially equal to the tilt angle formed by the center line of the tilted hole to be made, and the processed portion of the bar workpiece is perpendicular to the direction of the axis parallel to the axis of the main axis Gripping is performed on the back spindle side that can be moved two-dimensionally in two directions, and the machined part is cut from the bar workpiece, and a drilling tool is formed in the machined part in the drilling feed direction. The drilling tool and the machining portion are set to coincide with the center line of the inclined hole, and the drilling tool and the machining portion are rotated relative to each other about the axis of the back spindle, and the machining portion to be formed NC lathe for forming the inclined hole by relatively inserting the drilling tool along the center line of the inclined hole A gradient drilling chuck which is used to tilt the drilling process by,
A cylindrical processed part gripping surface whose center line is substantially inclined by the inclination angle with respect to its own axis is formed, fitted coaxially to the back main axis, and the centerline of the processed part gripping surface is The processing portion is gripped by the processing portion gripping surface so as to substantially coincide with the center line of the processing portion.
[0012]
An inclined lathe NC lathe for achieving the object of the present invention is configured as follows.
[0013]
A main shaft for rotating the bar workpiece is provided, and it has an axis parallel to the axis of the main shaft, and can be moved toward and away from the main axis along this axis and in a first direction perpendicular to the axis of the main shaft. In addition, the back main shaft is provided on the side that is fed out from the main shaft of the bar workpiece so that it can stop at a position in the desired rotation direction, and the first direction, the back main shaft axis, and the first direction are between the main shaft and the back main shaft. A tool post that is relatively movable in two directions perpendicular to the second direction is provided, and a chuck for gripping a processing portion consisting of a feeding portion from the main shaft of the bar workpiece is fitted coaxially to the rear main shaft. Based on the NC lathe.
[0014]
In this NC lathe, the back spindle chuck has a cylindrical processed part gripping surface. The inclination angle between the chuck axis for the back spindle and the center line of the processing part gripping surface is set to be substantially equal to the inclination angle formed by the center line of the processing part and the center line of the inclined hole to be formed in this processing part. Has been. Then, a working part tilting tool for tilting the processing part is provided on the tool post so that the center line of the processing part is inclined in the first direction by the tilt angle from the axis of the main spindle, and the drilling tool is opposed to the rear main spindle. Provided on the tool post, provided with a cutting tool for cutting off the processing part from the bar workpiece, and provided with a rotating device for relatively rotating the back spindle and the drilling tool around the axis of the back spindle. .
[0015]
In this configuration, when the distance between the back spindle and the drilling tool is reduced along the axis of the back spindle while rotating relatively between the back spindle and the drilling tool by the rotating device, the chuck mounted on the back spindle An inclined hole can be formed in the gripped processing portion.
[0016]
It is desirable to provide the tool post with a grooving tool for grooving the bar workpiece to a predetermined diameter.
[0017]
It is highly desirable that the drilling tool is immovably mounted on the tool post and that the rotating device allows the back spindle to rotate about that axis. The chuck is preferably of a rotary type.
[0018]
An inclined hole machining chuck used in an NC lathe according to the present invention has a main axis for rotating a bar workpiece and an axis parallel to the axis of the main axis, and is relative to the main axis along the parallel axis. Side of the bar work so that it can be moved in a first direction perpendicular to the axis of the main shaft and can stop rotating at a predetermined rotational position. The main shaft is provided on the rear surface of the main shaft, and the main shaft and the main shaft of the back surface can be moved relative to each other in two directions, the first direction and the second direction perpendicular to the first direction and the main shaft of the back surface. And a center line of a processing portion comprising a feeding portion of the bar workpiece from the main shaft is inclined in the first direction by an inclination angle from the axis of the main shaft to the center line of the processing portion. A tool for tilting the machined part is provided on the tool post so as to incline the machined part so as to face the back spindle. A tool is provided on the tool post, a cutting tool for cutting off the processed portion from the bar workpiece is provided on the tool post, and the back spindle and the drilling tool are relatively positioned around the axis of the back spindle. A rotation device that performs a rotational rotation, and the rotation device causes a relative rotation between the back spindle and the drilling tool, and the distance between the back spindle and the drilling tool is set to the distance between the back spindle and the drilling tool. An inclined hole machining chuck used in an NC lathe for inclined hole machining that shrinks along the axis to form an inclined hole in the machining portion,
Cylindrical machining having a centerline that is coaxially fitted to the back spindle and that is inclined at an angle substantially equal to the inclination angle of the centerline of the inclined hole to be formed in the processing portion from its own axis. It is characterized by having a part gripping surface.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments with reference to the drawings.
[0020]
FIG. 1 is an axial longitudinal sectional view of a product 1 in which inclined holes are formed by using an NC lathe, a machining method, and a collet chuck attached to a back spindle according to the present invention. The cylindrical product 1 is formed with inclined partial holes 2, 3 and 4 (hereinafter collectively referred to as “inclined holes 5”) having a plurality of inner diameters (three in FIG. 1). The center lines 3 and 4 are common to each other and are inclined at a predetermined angle (inclination angle) α (for example, 3 °) with respect to the center line 7 of the product 1. Centerlines 6 and 7 intersect at an intersection point O.
[0021]
FIG. 2 shows a perspective view of an embodiment of an NC lathe for machining an inclined hole in a machining part of a bar workpiece. The main shaft 8 has a horizontal Z1 axis and is fixed on the bed 11. A rotatable main shaft collet chuck device 9 is mounted on the main shaft 8 coaxially therewith. A headstock 10 is provided on one side of the main shaft 8 on the bed 11 so as to be concentric with the main shaft 8 and contact with and separate from the main shaft 8 with a predetermined stroke. A bar workpiece (shown at 19 in FIG. 7A) passes through the headstock 10 coaxially with the spindle 8, ie, coaxially with the Z1 axis. The spindle collet chuck device 9 and the bar workpiece 19 are rotated in a predetermined direction at a predetermined speed by a servo motor (not shown) incorporated in the spindle stock 10. This bar work 19 is guided by the spindle collet chuck device 9 by the feed movement and fed out from the spindle 8 by a predetermined length, while the spindle collet chuck device 9 stops rotating, that is, the spindle 8 The rotation is stopped by stopping the rotation. In the present invention, the processed portion of the bar work 19 refers to a portion that is fed from the main shaft 8 and includes the inclined hole processing according to the present invention, and is processed by an NC lathe to become the product 1, see FIGS. 7 and 8. This is indicated by the numeral 28.
[0022]
A back spindle stock 12 is provided on the opposite side of the spindle 8 from the spindle stock 10. A back spindle 13 having a Z2 axis parallel to the Z1 axis and in a vertical plane including the Z1 axis is mounted on the back spindle base 12 so as to rotate around the Z2 axis (FIG. 3). The rear headstock 12 is moved by the servo motor 14 in the direction of the Z3 axis parallel to the Z2 axis, and on the Z1 axis and the Z2 axis in the vertical plane including the Z1 axis, that is, the plane including the Z1 axis and the Z2 axis. It can be moved by the servo motor 15 in the direction of the Y2 axis, which is a perpendicular vertical axis, so that it can be moved two-dimensionally in the two directions of the Z3 axis and the Y2 axis. Since the back main shaft 13 moves together with the back main shaft 12, hereinafter, the Z3 axis is absorbed by the Z2 axis and both are referred to as the Z2 axis.
[0023]
A tool post 16 is disposed between the main spindle 8 and the rear main spindle 12. This turret 16 intersects or is perpendicular to the Z1 axis, the Z2 axis, and the Y1 axis perpendicular to the Z1 axis and the Z2 axis (ie, parallel to the Y2 axis), the Z1 axis, the Z2 axis, and the Y2 axis, and is orthogonal to the Y1 axis. The servomotors 17 and 18 can move two-dimensionally in two directions with respect to the horizontal X axis. The tool post 16 and the back headstock 12 are applied to the machining portion 28 of the bar work 19 before the inclined hole machining, together with the drilling tool for the inclined hole machining according to the present invention, as in the case of the known NC lathe. For example, machining tools for machining such as turning, side drilling, and milling are attached. Further, a grooving tool 48 (FIG. 7 (A)), a machining portion inclination tool 49 (FIG. 7 (B)), an end mill 50 (FIG. A cutting tool such as)) and a drilling tool such as a drill 51 (FIG. 7D) are mounted.
[0024]
FIG. 3 is an axial cross-sectional view of the main part of the back spindle stock 12 with the back spindle 13 mounted coaxially. The back main shaft 13 is pivotally supported in the axial direction (Z2 axial direction) in the back main shaft 12 via a radial bearing 21 and an axial bearing 22. The back spindle 13 is a servo built in the back spindle base 12 through a gear 23 mounted on the back spindle 13 and a rotation transmission mechanism (not shown) such as a gear train engaged therewith. The motor (not shown) is rotated at a predetermined speed in a predetermined direction around the Z2 axis and can be stopped at a predetermined position in the rotation direction. Hereinafter, with respect to the back spindle stock 12 and the back spindle 13 and the members provided on them, the main shaft 8 side and the end and end on the main shaft 8 side are referred to as the front side, the front end, and the front end portion, respectively, and are opposite to the main shaft 8. In addition, the opposite end and end portion of the main shaft 8 are referred to as a rear side, a rear end, and a rear end portion, respectively.
[0025]
The back main shaft 13 has a support tube portion 24 supported by the bearings 21 and 22, and a diameter increasing tube portion 25 protruding from the front end of the back head stock 12 toward the main shaft 8 on the front end side thereof.
[0026]
The back spindle 13 is mounted with a back spindle collet chuck device 27 (hereinafter simply referred to as “collet chuck device 27”). The collet chuck device 27 includes a collet chuck sleeve 29, a collet chuck 30, and a collet chuck nut 31.
[0027]
The collet chuck sleeve 29 includes a cylindrical body portion 33 inserted into the support tube portion 24 of the rear main shaft 13 so as to be slidable coaxially in the axial direction, and a frustoconical pressure surface (tapered) having an increased diameter on the front side thereof. A head portion 35 having a surface 34). A vertical groove 36 is formed on the outer periphery of the rear end of the head portion 35, and the pin 37 causes the collet chuck sleeve 29 to move in the axial direction with respect to the back main shaft 13 but does not rotate (that is, rotates together with the back main shaft 13). It is like that. Since the center lines of the collet chuck sleeve 29, the body portion 33, the collet chuck device 27, and the collet chuck 30 coincide with the Z2 axis of the back main shaft 13, these center lines are also expressed as the Z2 axis.
[0028]
The collet chuck 30 includes a cylindrical body portion 38 that is inserted into the collet chuck sleeve 29 so as to be axially slidable, and a machining portion caliber portion formed on the front side thereof and having a three-part claw-like elasticity (hereinafter, referred to as “collet chuck portion”). 39) (referred to as “caliber”). A frustoconical tapered surface 40 facing the pressing surface 34 of the collet chuck sleeve 29 is formed on the outer peripheral portion on the front side of the aperture 39. As will be described later, when the collet chuck sleeve 29 is retracted and the pressing surface 34 is separated from the tapered surface 40, the diameter portion 39 of the collet chuck 30 is elastically expanded, and the angle of the tapered surface 40 is Although slightly larger than the angle of the pressing surface 34 of the collet chuck sleeve 29, when the collet chuck sleeve 29 advances and the pressing surface 34 presses the tapered surface 40 of the collet chuck 30, the tapered surface 40 becomes the pressing surface. 34 and a complementary shape.
[0029]
Referring to FIGS. 3, 4, 5 and 6, the collet chuck 30 has a Z2 axis at an inclination angle β substantially equal to the inclination angle α of the inclined hole 5 formed in the machining portion 28 in the bore portion 39. A cylindrical hole-shaped gripping surface 42 having an intersecting center line 41 is formed. The intersection P between the center line 41 and the Z2 axis is the center line of the processing portion 28 (same as the center line 7 of the product 1 in FIG. 1) when the processing portion 28 is gripped by the collet chuck 30 as described later. It is formed so as to coincide with the intersection point O with the center line 6 of the inclined hole 5 formed thereon.
[0030]
Returning to FIG. 3, a compression coil spring 44 is provided between the rear end of the collet chuck 30 and the shoulder 43 inside the rear end of the collet chuck sleeve 29. The compression coil spring 44 urges the collet chuck 30 forward with respect to the collet chuck sleeve 29 so that the reference surface 46 of the tapered portion 40 of the caliber portion 39 of the collet chuck 30 is brought into contact with the pressure contact surface 47 of the collet chuck nut 31. Is always in contact.
[0031]
A push rod 45 is inserted into the rear main shaft 13 from the rear side thereof so as to be reciprocally movable in the axial direction by a drive device (not shown), as in the case of a conventional NC device. In FIG. 3, the push rod 45 is retracted. In this state, the collet chuck sleeve 29 is also retracted by the biasing force of the compression coil spring 44, and the pressing surface 34 of the collet chuck sleeve 29 is the tapered surface of the collet chuck 30. It is in a so-called unclamping state in which it is separated from the rear of the Z2 axis from 40 and the aperture 39 of the collet chuck 30 is released.
[0032]
When the push bar 45 is advanced, the collet chuck sleeve 29 advances against the urging force of the compression coil spring 44, and the pressing surface 34 of the collet chuck sleeve 29 presses the tapered surface 40 of the collet chuck 30. The tapered surface 40 is brought into pressure contact with the pressing surface 34 so as to be substantially complementary, and the diameter portion 39 is reduced so as to grip a processed portion 28 described later, so that a so-called clamped state is obtained.
[0033]
Hereinafter, the inclined hole machining method of the present invention based on the inclined hole machining step of FIG. 7, FIG. 8 which is a front view of the machining portion inclined tool, the machining step of FIG. 7, and FIG. 9 which is a flowchart corresponding thereto. Will be described.
[0034]
In Step 1 shown in FIG. 9, the headstock 10 (FIG. 2) is fed and driven, and as shown in FIG. 7A, the bar material processing portion 19 is sent out from the main shaft 8 as the processing portion 28, and to the processing portion 28. Processing other than the inclined hole 5 is performed. The length of the processed portion 28 fed from the main shaft 8 (that is, the feed length of the bar workpiece 19 from the main shaft 8) is the length L to be formed in the product 1 and the groove width for the groove processing in step 2. Is substantially equal to the sum of
[0035]
Next, the process proceeds to Step 2, and the portion 20 ("neck portion 20") having a length L from the front end of the processed portion 28 as shown in FIG. In step 4, grooving is performed with a grooving tool 48 attached to the tool post 16 until the diameter becomes sufficient to incline the processing portion 28.
[0036]
Next, the process proceeds to step 3 where the rotation of the main shaft 8 is stopped and the rotation of the machining unit 28 is also stopped. When the stop position in the rotation direction of the machining portion 28 is determined in relation to the inclined hole 5 and other machining, the spindle 8 is moved to the position by using a stop mechanism similar to the stop mechanism of the spindle of a known NC lathe. Can be stopped.
[0037]
In the next step 4, as shown in FIG. 7B, the machining portion 28 is tilted by the machining portion tilting tool 49 attached to the tool post 16. As shown in FIG. 8, the machining section tilting tool 49 is a bifurcated fork. The fork is sandwiched between the machining section 28 and pushed in one direction (upward in the figure) of the Y1 axis, with respect to the Z1 axis. The processed part 28 is inclined in the same direction by an angle γ substantially equal to the inclination angle α formed by the center line 6 of the product 1 and the center line 7 of the inclined hole 5. The machining section tilting tool 49 keeps pushing the machining section 28 until the machining section 28 is gripped by the back spindle 13 in step 6.
[0038]
In step 5, the collet chuck 30 mounted on the back main shaft 13 is aligned with the center line 6 of the inclined hole 5 to be formed in the processing portion 28 gripped by the main shaft 8. Is set by the rear headstock 12. Next, the process proceeds to step 6 where the back spindle 13 is moved in the direction of the Z2 spindle 8 by the back spindle base 12 to receive the processed portion 28 by the gripping surface 42 of the collet chuck 30 and advance the push rod 45 in the retracted position. Then, the aperture portion 39 of the collet chuck 30 is closed, and the processing portion 28 is gripped by the aperture portion 39 as shown in FIG.
[0039]
Next, the process proceeds to step 7 where the neck 20 of the processing unit 28 is cut with a cutting tool such as an end mill 50, and the processing unit 28 is separated from the bar workpiece 19. Then, the back spindle stock 12 is retracted, and the back spindle 13 is retracted together with the processing portion 28.
[0040]
In FIG. 7 (D), 51 is a drill attached to the tool post 16 so as to be parallel to the Z2 axis, and corresponds to the diameter of the corresponding one of the inclined partial holes 2, 3 and 4 to be formed. Have a diameter to do. In this case, only one drill 51 is shown in FIG. 7D, but the number of drills corresponding to the number of inclined partial holes is attached to the tool post 16.
[0041]
In step 8, the tool post 16 is moved in the X-axis and Y1-axis directions so that the axis of the drill 51 and the center line of the processing portion 28 held by the collet chuck 30 are aligned (that is, both are on the Z2 axis). Set). Next, the process proceeds to step 9 where the processed portion 28 is rotated about the Z2 axis together with the back main shaft 13.
[0042]
Next, the back spindle stock 12 is advanced to advance the processing portion 28, and one of the corresponding inclined partial holes 2, 3, 4 is processed in the processing portion 28 with the drill 51. Other inclined partial holes are formed in the same manner with other drills in order. Thereby, Step 10 is executed, and the processing unit 28 is completed as the product 1.
[0043]
In Step 8-10, an example in which the inclined hole 5 is formed by using the drill 51 with reference to FIG. 7D has been shown. However, not only the drill but also another drilling tool such as a boring tool is used. Can do. For example, when a boring tool is used, the boring tool may be attached to the tool post 16 so that the cutting edge is separated by the radius of the inclined partial hole formed from the Z1 axis. In this case, since a plurality of inclined partial holes can be formed by one boring tool, there is an important advantage that the number of drilling tools can be reduced.
[0044]
After the inclined hole 5 is formed, as shown in step 11, the rotation of the back main shaft 13 is stopped, the push rod 45 is retracted, and in the next step 12, the aperture 39 of the collet chuck 30 is opened, and the processing portion An inclined hole 5 is formed in 28 and the product 1 is released from the caliber 39. Thus, one cycle of inclined hole machining is completed.
[0045]
Finally, it is checked in step 13 whether there is a subsequent machining of the next inclined hole, and if there is, the process returns to step 1 and the inclined hole machining is repeated. If it does not exist, the inclined hole machining is finished.
[0046]
In the above description, the collet chuck has been described as a gripping device that re-adds the processed portion in order to form an inclined hole in the processed portion. However, the present invention is not limited to the collet chuck, and the processed portion is appropriately gripped. Any other possible chuck may be used. The collet chuck device for the spindle can be replaced with any other suitable collet chuck.
[0047]
【The invention's effect】
A gripping surface with an inclination angle substantially equal to the inclination angle of the inclined hole to be formed in the machined part is formed in the diameter part of the chuck for the back spindle, so that the drilling tool can be used on the tool post in accordance with the inclination angle of the inclined hole. Therefore, since it is not necessary to install with an inclination and no need to rotate the drilling tool, the machining method of the inclined hole and the structure of the NC lathe for machining the inclined hole are simplified, and the machining cost and the NC lathe There is an effect that the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an axial longitudinal sectional view of a product in which inclined holes are formed.
FIG. 2 is a perspective view of an embodiment of an NC lathe used in the present invention.
FIG. 3 is an axial longitudinal sectional view of a main part of a back spindle equipped with a back spindle collet chuck device;
FIG. 4 is a side view of an embodiment of a collet chuck for a back spindle.
5 is a front view of the collet chuck for the back spindle in FIG. 4. FIG.
6 is a longitudinal cross-sectional view of the collet chuck for the back main shaft in FIG. 4;
7A and 7B show an inclined hole machining process, where FIG. 7A shows a grooving process, FIG. 7B shows a machining part inclination process, and FIG. 7C shows gripping of the machining part by a back spindle collet chuck and cutting of the machining part. Step (D) shows an inclined partial hole machining step using a drill.
FIG. 8 is a front view of a machining unit tilting tool.
FIG. 9 is a flowchart of inclined hole machining.
[Explanation of symbols]
1 Product 2, 3, 4 Inclined partial hole 5 Inclined hole 6, 7 Center line 8 Main shaft 9 Main shaft collet chuck device 10 Main shaft base 11 Bed 12 Rear main shaft base 13 Rear main shaft 14, 15 Servo motor 16 Tool post 17, 18 Servo Motor 19 Bar material workpiece 20 Neck portion 21 Radial bearing 22 Axial bearing 23 Gear 24 Bearing cylinder portion 25 Diameter increasing cylinder portion 26 Flange 27 Collet chuck device 28 Processing portion 29 Collet chuck sleeve 30 Collet chuck 31 Collet chuck nut 33 trunk 34 pressing surface (tapered surface)
35 Head part 36 Vertical groove 37 Pin 38 Body part 39 Machining part caliber part (caliber part)
40 Tapered surface 41 Center line 42 Gripping surface 43 Shoulder portion 44 Compression coil spring 45 Push rod 46 Reference surface 47 Pressure contact surface 48 Grooving tool 49 Machining portion inclination tool 50 End mill (cutting tool)
51 Drill (drilling tool)
L (machined part) length O, P intersection X axis Y1, Y2 axis Z1, Z2, Z3 axis α, β, γ tilt angle

Claims (9)

Inclining the processed portion of the bar workpiece that has been drawn out from the main shaft by a predetermined length substantially equal to the inclination angle formed by the center line of the processed portion and the center line of the inclined hole to be formed in the processed portion,
A chuck in which a cylindrical processed part gripping surface having a center line substantially inclined by the inclination angle with respect to its own axis is formed in a direction parallel to the axis of the main shaft and a direction of the parallel axis. A back spindle that can be moved two-dimensionally in two directions with a perpendicular direction is fitted coaxially, and the center line of the processed part gripping surface is substantially aligned with the center line of the processed part. Grip the processing part with the gripping surface of the processing part,
Cutting the processed part from the bar workpiece,
The drilling tool is set so that its drilling feed direction coincides with the center line of the inclined hole to be formed in the processing part gripped by the processing part gripping surface of the chuck;
The drilling tool and the chuck are rotated relative to each other about the axis of the back main shaft, and the drilling tool is relatively inserted along the center line of the inclined hole to be formed in the processing portion. Then, the inclined hole is formed by using an NC lathe. 2. The inclined hole machining method using an NC lathe according to claim 1, wherein the neck of the machined part is grooved to a predetermined diameter to an extent that the machined part can be inclined. The inclined hole machining method using an NC lathe according to claim 1 or 2, wherein the drilling tool is provided non-rotatingly and the chuck is rotated about its axis. Inclining the processed portion of the bar workpiece that has been drawn out from the main shaft by a predetermined length substantially equal to the inclination angle formed by the center line of the processed portion and the center line of the inclined hole to be formed in the processed portion,
Gripping the processed portion of the bar workpiece on the back spindle side which can be moved two-dimensionally in two directions, a direction parallel to the axis of the spindle and a direction perpendicular to the direction of the parallel axis;
Cutting the processed part from the bar workpiece,
Setting the drilling tool such that its drilling feed direction coincides with the center line of the inclined hole to be formed in the machined part;
The drilling tool and the processing portion are rotated relative to each other about the axis of the back main shaft, and the drilling tool is relatively moved along the center line of the inclined hole to be formed in the processing portion. An inclined hole machining chuck used in an inclined hole machining method by an NC lathe to insert and form the inclined hole,
A cylindrical processed part gripping surface whose center line is substantially inclined with respect to its own axis by the inclination angle is formed,
The rear spindle is fitted coaxially,
Used in an inclined hole machining method with an NC lathe characterized in that the center line of the processing part gripping surface is substantially matched with the center line of the processing part and the processing part is gripped by the processing part gripping surface Inclined hole machining chuck. A spindle that rotates the bar workpiece,
The main shaft has an axis parallel to the main shaft, and can be moved toward and away from the main shaft along the parallel axis in a first direction perpendicular to the main shaft and in a predetermined rotational direction. A back spindle provided on the side of the bar workpiece that is fed out from the spindle so that rotation can be stopped at
A tool post that is relatively movable in two directions, the first direction and the second direction perpendicular to the first direction and the axis of the rear main shaft, between the main shaft and the rear main shaft;
In an NC lathe formed by fitting a chuck for gripping a processed part composed of a feeding part from the main shaft of the bar workpiece to the rear main shaft,
The chuck has a cylindrical work part having a center line inclined from the axis at an angle substantially equal to an inclination angle of a center line of an inclined hole to be formed in the work part with respect to a center line of the work part. Having a gripping surface,
A tool for inclining the processing part for inclining the processing part so that the center line of the processing part inclines in the first direction from the axis of the main shaft by the inclination angle;
A drilling tool is provided on the tool post facing the back spindle,
A cutting tool for cutting off the processed portion from the bar workpiece is provided on the tool post,
Providing a rotating device for rotating the back spindle and the drilling tool relative to each other about the axis of the back spindle;
The rotating device is mounted on the back spindle by reducing the distance between the back spindle and the drilling tool along the axis of the back spindle while relatively rotating between the back spindle and the drilling tool. An NC lathe for machining an inclined hole, characterized in that an inclined hole is formed in the processed part held by the chuck. 6. The NC lathe for machining an inclined hole according to claim 5 , wherein a grooving tool for grooving the bar workpiece to a predetermined diameter is provided on the tool post. The NC lathe for machining an inclined hole according to claim 5 or 6 , wherein the drilling tool is immovably provided on the tool post, and the rotating device rotates the back spindle about the axis. The inclined lathe NC lathe according to any one of claims 5 to 7 , wherein the chuck is a rotary chuck rotated by the rotating device. A spindle that rotates the bar workpiece,
The main shaft has an axis parallel to the main shaft, and can be moved toward and away from the main shaft along the parallel axis in a first direction perpendicular to the main shaft and in a predetermined rotational direction. A back spindle provided on the side of the bar workpiece that is fed out from the spindle so that rotation can be stopped at
A tool post that is relatively movable in two directions, the first direction and the second direction perpendicular to the first direction and the axis of the rear main shaft, between the main shaft and the rear main shaft;
Inclining the machined portion so that the center line of the machined portion consisting of the feeding portion of the bar workpiece from the spindle is inclined in the first direction from the axis of the spindle with respect to the centerline of the machined portion. Providing the tool post with a machining part tilting tool,
A drilling tool is provided on the tool post facing the back spindle,
A cutting tool for cutting off the processed portion from the bar workpiece is provided on the tool post,
Providing a rotating device for rotating the back spindle and the drilling tool relative to each other about the axis of the back spindle;
While the relative rotation between the back spindle and the drilling tool is caused by the rotating device, the distance between the back spindle and the drilling tool is reduced along the axis of the back spindle and inclined to the processing portion. An inclined hole machining chuck used in an NC lathe for machining inclined holes for forming holes,
Cylindrical machining having a centerline that is coaxially fitted to the back spindle and that is inclined at an angle substantially equal to the inclination angle of the centerline of the inclined hole to be formed in the processing portion from its own axis. An inclined hole machining chuck used for an NC lathe characterized by having a gripping surface .

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