JP2007015086A - Lathe turning device for nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lathe turning device, efficiently manufacturing an eccentric nut with a very small machining error of the outer peripheral surface of a projecting part or a recessed part to a screw part. <P>SOLUTION: This lathe turning device includes: a spindle 6 driven in rotation by a driver; a nut holder 15 fitted and fixed to the spindle 6; a rotary ring 19 fitted to the spindle 6 to freely rotate relatively; a stopper 22 for preventing reverse rotation of the rotary ring 19; and a cutting tool 13 for turning a nut W held on the nut holder 15, wherein the nut holder 15 includes a bolt part 17 where the nut W is engaged and held, and the rotary ring 19 includes a through hole 21 which the bolt part 17 penetrates and a support surface abutting on the seating surface of the nut. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a turning device for a nut for performing turning as secondary processing of a nut, and in particular, for manufacturing a special locking nut (so-called hard lock nut (registered trademark)) having an eccentric convex portion or a concave portion. The present invention relates to a lathe machine that can be suitably used.

The applicant of the present application has been manufacturing and selling a hard lock nut (registered trademark) having a structure shown in Patent Document 1, and the hard lock nut is composed of a pair of nuts, and one nut surrounds a screw hole. The outer peripheral surface is provided with a projecting portion having a truncated cone-shaped tapered surface, and the other nut is provided with an inner peripheral surface having a truncated cone-shaped tapered surface and a recess that fits into the projecting portion. One of the projecting portion and the recessed portion is eccentric with respect to the axis of the screw hole.
Japanese Patent Publication No. 3-526

  It is preferable to form such a protrusion or recess by a turning method. In general turning processing equipment, a chuck device is provided at the tip of the spindle to hold the workpiece (workpiece), and the workpiece is attached to the spindle by centering the workpiece and holding the work outer peripheral surface with the chuck device. It comes to hold.

The accuracy of the function of preventing the locking of the hard lock nut depends largely on the processing accuracy of the eccentric convex surface of the eccentric convex portion or the concave portion, but the processing accuracy of the eccentric conical surface is that for the threaded portion of the nut. Therefore, the outer peripheral surface of the nut is not a reference.
Certainly, the processing accuracy of the outer peripheral surface of the nut is determined and processed according to a certain standard, but in order to make the lock function of the hard lock nut more stable, an outer peripheral chuck that is superimposed on the processing error of the outer peripheral surface of the nut. The processing method of the eccentric convex part or the concave part is not sufficient, and it is necessary to process the eccentric convex part or the concave part directly with high accuracy on the basis of the screw part.
Furthermore, when turning an eccentric convex part or concave part by turning a standard nut as a work and turning one side of the work, it is necessary to quickly hold and release the work in order to improve productivity and reduce production costs. Strongly desired.

  The nut turning device of the present invention includes a main shaft that is rotationally driven by a driving device so as to be able to rotate forward and backward, a nut holder that is attached and fixed to the tip of the main shaft, and a shaft center of the main shaft at the tip of the main shaft. A rotation ring that is rotatably mounted around the rotation ring, a stopper that prevents reverse rotation of the rotation ring, and a bite that turns a nut that is a work piece held by the nut holding body. A bolt portion protruding toward the tip and screwing and holding the nut, and the rotating ring abuts a through-hole through which the bolt portion passes and a seat surface of the nut screwed into the bolt portion. And when the main shaft is rotated forward, the nut is screwed into the bolt portion so that the nut seat surface and the support surface of the rotating ring are in pressure contact, and the main shaft is reversed. When to the stopper The nut by the surface pressure between the supporting surface and the nut bearing surface of the rotary ring reverse rotation is prevented What is characterized in that relative rotation in the removal direction to the main axis.

  In the above-described turning apparatus according to the present invention, it is preferable that the rotating ring is attached to the main shaft so as not to be axially movable.

  Moreover, it is preferable that the said nut holding body is attached and fixed to the said main shaft so that attachment or detachment is possible.

  Further, if the axis of the bolt part is eccentric with respect to the axis of the main shaft and the bite is provided so as to be able to move obliquely with respect to the axis of the main shaft, the hard lock nut can be manufactured. It can be suitably used.

  According to the present invention, it is possible to efficiently manufacture a hard lock nut (registered trademark) with a very small processing error on the outer peripheral surface of the convex portion or the concave portion with respect to the threaded portion, and thus improve the performance stability and manufacture of the hard lock nut This can greatly contribute to cost reduction.

  1 to 3 show a turning apparatus 1 suitable for carrying out the turning method of the present invention, and the apparatus 1 has a first base on an installation table 2 as shown in FIG. A base 3 and a second base 4 that is spaced apart from the first base 3 are installed, and a rail 5 is installed over both bases 3. In the present embodiment, since the outer peripheral surface of the eccentric convex portion or the inner peripheral surface of the eccentric concave portion of the nut W is turned into a truncated cone-shaped tapered surface, the rail 5 is installed obliquely rather than parallel to the spindle 6 axis. is doing. Of course, a mechanism for adjusting the inclination angle of the rail 5 may be provided, and the rail 5 is installed in parallel with the main shaft 6, and the second rail is further provided on the carriage provided on the rail 5. And the second rail can be inclined with respect to the main axis. Further, in the drawing, the rail 5 is inclined with respect to the horizontal line. However, when the rail 5 is installed horizontally, it can be installed so that the main shaft 6 and the rail 5 are inclined relatively in plan view. .

  The first base 3 is provided with a main shaft 6 so as to be rotatable about its axis, and a motor (driving device) for rotating the main shaft 6 is installed. The motor drive shaft 7a and the main shaft 6 are The pulleys 8 and 9 and the transmission belt 10 are linked together. Thus, by rotating the motor forward or backward, the main shaft 6 is driven to rotate in a forward / reverse manner. In addition, a clutch or a transmission gear mechanism may be interposed in the drive transmission system between the motor and the main shaft 6. However, from the viewpoint of speeding up of the workpiece W from the main shaft after turning, a clutch or the like is used. It is preferable to transmit the driving force directly without interposition.

  A carriage 11 is installed on the pipe rail 5 so as to be able to reciprocate. The movement of the carriage 11 may be configured to be performed manually, or may be configured to be driven to reciprocate by appropriate driving means such as a fluid pressure cylinder. When driving means such as a fluid pressure cylinder is used, it is possible to achieve semi-automation or full-automation of machining by setting the stroke amount constant by a control device such as a control valve.

  A tool post 12 is installed on the carriage 11, and a tool 13 for turning a nut W, which is a workpiece (workpiece), can be attached and fixed to the tool post 12. Thus, the cutting tool 13 is provided so as to be movable obliquely with respect to the axis of the main shaft 6 by a structure such as an inclined arrangement of the rails 5.

  As shown in FIG. 1, a fitting hole 14 is provided at the tip of the main shaft 6 so as to open to the tip surface. The fitting hole 14 is formed so that the inner peripheral surface thereof is a truncated cone-shaped surface that gradually becomes trapezoidal as it reaches the distal end side, and its axis is concentric with the axis of the main shaft 6.

  A nut holder 15 for holding and fixing the nut W to the distal end portion of the main shaft 6 is fitted in the fitting hole 14 so as to be detachable and replaceable. The nut holder 15 is integrally provided with a base portion 16 fitted and fixed in the fitting hole 14 and a bolt portion 17 projecting toward the tip and screwing and holding the nut W. The shaft center of the bolt portion 17 is eccentric by a minute amount with respect to the shaft center of the main shaft 6 and the base portion 16. The outer peripheral surface of the base portion 16 is formed in a truncated cone shape that matches the inner peripheral surface of the fitting hole 14, and a screw hole 16 a is formed in the base end portion of the base portion 16. Then, the base 16 is fitted into the fitting hole 14, and the fixing bolt 18 inserted through the main shaft 6 is screwed into the screw hole 16 a, so that the nut holder 15 is attached and fixed to the distal end portion of the main shaft 6. It is like that.

  A rotating ring 19 is attached to the tip of the main shaft 6 so as to be relatively rotatable about the axis of the main shaft 6. The rotary ring 19 is attached to the tip end of the main shaft 6 so as to be rotatable and non-movable in the axial direction via a bearing 20 having an appropriate structure such as a double row angular ball bearing or a combined angular ball bearing. A through hole 21 through which the bolt portion 17 passes is provided in the central portion of the rotating ring 19, and the bolt portion 17 passes through the through hole 21 and protrudes to the front end side from the front end surface of the rotating ring 19. It has become. The rotating ring 19 has a support surface that contacts the seat surface of the nut W that is screwed to the bolt portion 17. When the main shaft 6 is rotated forward, the nut W is screwed into the bolt portion 17. By doing so, the nut seat surface and the support surface of the rotating ring come into pressure contact. Such a support surface is preferably constituted by the side surface on the front end side of the rotating ring 19 for simplification of the structure.

  Moreover, in the turning processing apparatus of the present embodiment, as shown in FIG. 2, a stopper 22 that prevents reverse rotation of the rotating ring 19 is provided. The stopper 22, together with a cam-like convex portion 23 provided on the outer peripheral surface of the rotating ring 19, constitutes a one-way rotation preventing mechanism that allows normal rotation of the rotating ring 19 but prevents reverse rotation. In other words, the stopper 22 is swingably attached to the first base 3 side via the support shaft 24, and the stopper 22 is pressed by an urging means such as a spring so that its tip end portion comes into contact with the outer peripheral surface of the rotating ring 19. 22 is urged toward the rotating ring 19. In addition, you may make it press the front-end | tip part of the stopper 22 against the outer peripheral surface of the rotating ring 19 manually as needed.

  The cam-like convex portion 23 has an inclined surface 23a that pushes the stopper 22 radially outward when the rotating ring 19 rotates forward, and a stopper 22 that stops the rotation of the rotating ring 19 when the rotating ring 19 reverses. And a rising surface 23b that strikes the tip. Thus, when the main shaft 6 is rotated in the reverse direction, the reverse rotation of the rotating ring 19 is prevented by the stopper 22, and the nut W is supported against the main shaft 6 by the surface pressure between the support surface of the rotating ring 19 and the nut W seat surface. And rotate relative to the removal direction.

Next, the manufacturing method of the hard lock nut using the said processing apparatus is demonstrated.
First, a standard nut W is prepared, and a nut holder 15 according to the size of the nut W is fitted and fixed in the fitting hole 14, and then the rotating ring 19 is attached to the tip end portion of the main shaft 6 via the bearing 20. Next, when the screw hole of the nut W is held by hand so as to match the tip of the bolt portion 17 of the nut holder 15 and the motor 7 is driven to rotate the main shaft 6 in the normal direction, the nut W The bolt portion 17 is rapidly screwed, and the seat surface of the nut W comes into pressure contact with the support surface of the rotating ring 19.

  After holding the nut W on the nut holding body 15 in this way, the spindle 6 continues to rotate forward, and the cutting tool 13 is slid toward the nut W, and one side surface of the nut W is turned by the cutting tool 13. To do. At this time, since the shaft center of the bolt portion 17 is slightly decentered with respect to the shaft center of the main shaft 6, the outer peripheral surface of the convex portion or the concave portion of the nut W formed by turning is relative to the axial center of the screw hole. And processed to be slightly eccentric.

  After machining the eccentric convex portion or the eccentric concave portion in this way, when the main shaft 6 is rapidly reversely rotated by reverse rotation driving of the motor or the like, the rotation of the rotating ring 19 is prevented by the stopper 22. The rotation of the nut W that is in contact with the ring 19 is also suppressed, and the nut W naturally falls off from the bolt portion 17.

  The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate.

It is a principal part expanded sectional view of the turning processing apparatus which concerns on one Embodiment of this invention. It is the side view seen from the right direction of FIG. It is the whole simplified front view of the turning apparatus.

Claims (4)

  A main shaft that is driven to rotate forward and backward by a drive device, a nut holder that is attached and fixed to the tip of the main shaft, and a rotating ring that is attached to the tip of the main shaft so as to be relatively rotatable about the axis of the main shaft And a stopper that prevents reverse rotation of the rotating ring, and a bite that turns a nut that is a work piece held by the nut holder, the nut holder projects toward the tip, and the nut The rotating ring includes a through-hole through which the bolt portion passes, and a support surface that comes into contact with a seat surface of a nut screwed into the bolt portion. When the nut is rotated forward, the nut is screwed into the bolt portion so that the nut seat surface and the support surface of the rotating ring are pressed against each other, and when the main shaft is reversed, reverse rotation is prevented by the stopper. Rotating phosphorus The supporting surface and the turning device of the nut, characterized in that relative rotation in the removal direction the nut relative to the spindle by the surface pressure between the nut bearing surface.   2. The nut turning apparatus according to claim 1, wherein the rotating ring is attached so as not to be axially movable with respect to the main shaft.   3. The nut turning apparatus according to claim 1, wherein the nut holder is attached and fixed to the main shaft so as to be detachable and replaceable.   4. The nut turning apparatus according to claim 1, wherein an axis of the bolt portion is eccentric with respect to an axis of the main shaft, and the bite moves obliquely with respect to an axis of the main shaft. A nut turning device characterized by being provided.

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