JP2009000706A - Drawing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing apparatus which can efficiently perform drawing work by means of a plurality of drawing rollers even in the drawing apparatus for turning a workpiece. <P>SOLUTION: The drawing apparatus 1 includes a main spindle mechanism 2 having a gripping mechanism 21 arranged on the tip end of a main spindle 22 so as to grip a workpiece W, and a tool mounting mechanism 3 arranged so as to be opposed to the main spindle mechanism 2, wherein the tool mounting mechanism 3 includes a cylindrical body 30, a face plate 31 arranged on the side surface of the body 30, a plurality of roller mounting stands 33 arranged on the face plate 31 so as to move in the direction perpendicular to the axis A of the main spindle 22, a cam plate 34 having a spiral shape groove 34a formed therein, into which groove 34a guide pins 33a projected from the roller mounting stands 33 are fitted, and a rotationally driving mechanism 36 for turning the cam plate 34. The roller mounting stands 33 are moved in the direction perpendicular to the axis A of the main spindle 22 following the rotation of the cam plate 34. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drawing apparatus, and more particularly to a drawing apparatus that performs drawing by pressing a drawing roller against a work attached to a rotating spindle tip.

  Conventionally, as a drawing device for drawing a cylindrical member such as a pipe tip, a squeeze roller mounting base attached to a rotating spindle tip, which the applicant previously proposed, is supported so as to be slidable in the radial direction. There is a drawing apparatus that performs drawing on the tip of a pipe to be processed (hereinafter referred to as “workpiece”) fixed by (see, for example, Patent Document 1).

  When drawing with the workpiece fixed, there is an advantage that the drawing can be done by decentering or tilting the workpiece axis with respect to the spindle axis. Since it is necessary to arrange a cam plate or the like having a spiral groove for moving them in the radial direction, the weight is increased, the rotation speed of the spindle cannot be increased, and the processing speed is increased. There was the disadvantage of being slow.

  Therefore, in drawing processing, when there is no need to decenter or tilt the workpiece axis with respect to the spindle axis, there is a drawing device that rotates the workpiece and moves the drawing roller to process the tip of the workpiece. Used (see, for example, Patent Document 2).

As shown in FIG. 5, the drawing device 50 includes a main shaft mechanism 2 and a tool attachment mechanism 51 to which a drawing roller R provided opposite to the main shaft mechanism 2 is attached.
The main shaft mechanism 2 has a main shaft 22 disposed therein, is rotatably supported by a housing 23 via a bearing (not shown), and is driven to rotate by a drive motor M.
A gripping mechanism 21 that grips and fixes the cylindrical workpiece W is disposed at the tip of the main shaft 22 so that the axis of the work W is aligned with the axis A of the main shaft mechanism 2.

  The tool attachment mechanism 51 includes an elevating frame 52 for attaching a squeezing roller R as a processing tool and a support frame 55 for movably disposing the elevating frame 52, and the support frame 55 is an axis of the main shaft 22. An axial direction shifting means 53 for shifting in a parallel direction with respect to the core A and a right angle direction shifting means 54 for shifting the lifting frame 52 in a direction perpendicular to the axial core A are provided.

The axial direction transition means 53 is configured to cause the transition motor 53b to shift the support frame 55 that is slidably disposed on the rail 53a laid on the frame 6 in the illustrated horizontal direction via a linear guide or the like. ing.
Further, the right-angle direction shifting means 54 causes the moving motor 54b to move the elevating frame 52 slidably disposed on the rail 54a laid in the vertical direction in the figure on the support frame 55 via a linear guide or the like. I have to.

  In the above configuration, when machining the workpiece W, the workpiece W is gripped and fixed by the gripping mechanism 21 disposed at the tip of the main shaft 22, and the axial direction shifting means 53 of the tool mounting mechanism 51 is rotated while the main shaft 22 is rotated by the drive motor M. In addition, the right-angle direction transition means 54 is operated to press the squeezing roller R against the surface of the workpiece W so that the tip of the workpiece W is drawn.

However, in this drawing device, the rotation speed of the workpiece W is improved and the machining speed is increased by attaching the workpiece W to the main shaft as compared with the conventional drawing device in which the workpiece W is fixed. Therefore, the surface of the workpiece W needs to be plastically processed a plurality of times, and the total processing speed (cycle time) is increased.
In order to cope with such a problem, a plurality of squeezing rollers R may be arranged opposite to the axis A in a direction perpendicular to the axis A. However, as many squeezing rollers R as the number of squeezing rollers R may be used. The right-angle direction shifting means) must be disposed, which increases the installation space and increases the cost.
Japanese Patent No. 3514730 JP 2004-330288 A

  The present invention provides a drawing apparatus capable of efficiently performing drawing with a plurality of drawing rollers even in the drawing apparatus that rotates a workpiece in view of the problems of the conventional drawing apparatus. The purpose is to do.

  In order to achieve the above object, a drawing apparatus of the present invention comprises a drawing mechanism comprising a spindle mechanism provided with a gripping mechanism for gripping a workpiece at the tip of the spindle, and a tool mounting mechanism provided facing the spindle mechanism. In the apparatus, the tool mounting mechanism includes a cylindrical main body, a face plate disposed on the side surface of the main body, and a plurality of roller mounting bases disposed on the face plate so as to be movable in a direction perpendicular to the axis of the main shaft. A cam plate having a spiral groove into which a guide pin protruding from the roller mount is fitted, and a rotation drive mechanism for rotating the cam plate. It is characterized in that it is moved in a direction perpendicular to the axis.

  In this case, the cam shaft rotation drive mechanism can be composed of a numerically controlled motor and a speed reducer.

According to the drawing apparatus of the present invention, the tool mounting mechanism is provided with a cylindrical main body, a face plate disposed on the side surface of the main body, and the face plate arranged to be movable in a direction perpendicular to the axis of the main shaft. On the face plate by comprising a plurality of roller mounting bases, a cam plate engraved with a spiral groove into which a guide pin protruding from the roller mounting base is fitted, and a rotational drive mechanism for rotating the cam plate. A plurality of squeezing rollers can be arranged via a roller mounting base, and a plurality of tool mounting mechanisms need to be arranged because a workpiece can be processed by controlling a plurality of squeezing rollers by a single rotation drive mechanism. In addition, the cost of the entire apparatus can be suppressed without increasing the installation space, and the cycle time of the entire processing can be shortened.
In addition, the centering operation can be completed simply by arranging the face plate axis so that it coincides with the spindle axis, and the work is held and held by the gripping mechanism at the tip of the spindle until the start of machining. It is possible to provide a drawing apparatus that can perform smoothly.

  Further, by configuring the cam shaft rotation drive mechanism from a numerically controlled motor and a speed reducer, the cam shaft rotation can be controlled accurately and simply.

  Embodiments of a drawing apparatus according to the present invention will be described below with reference to the drawings. In addition, about the structure similar to a conventional apparatus, the same code | symbol and a series of code | symbol are attached | subjected, and description is abbreviate | omitted.

  1 to 4 show an embodiment of the drawing apparatus of the present invention.

As in the conventional example, the drawing apparatus 1 includes a spindle mechanism 2 and a tool attachment mechanism 3 to which a drawing roller R provided opposite to the spindle mechanism 2 is attached.
A gripping mechanism 21 is disposed at the tip of the spindle mechanism 2 to grip and fix the cylindrical workpiece W, and is attached so that the axis of the workpiece W coincides with the axis A of the spindle mechanism 2.

  The tool attachment mechanism 3 is provided with a cylindrical main body 30, a face plate 31 provided on the side face of the main body 30, and the face plate 31 movably disposed in a direction perpendicular to the axis A of the main shaft 22. It comprises a plurality of roller mounts 33, a cam plate 34 engraved with a spiral groove 34a into which a guide pin 33a protruding from the roller mount 33 is fitted, and a rotation drive mechanism 36 for rotating the cam plate 34. As the cam plate 34 rotates, the roller mounting base 33 is moved in a direction perpendicular to the axis A of the main shaft 22.

The rotational drive mechanism 36 preferably uses a numerical control motor 37 and a speed reducer 38. As the numerical control motor 37, for example, a servo motor can be used.
The speed reducer 38 is preferably a cyclo speed reducer that combines an inscribed planetary mechanism and a circular tooth profile, but is not particularly limited, and uses a planetary gear speed reducer or a harmonic drive type speed reducer. You can also

  The main body 30 of the tool attachment mechanism 3 is placed on the frame 6 so as to be movable in the horizontal direction in the figure by the axial direction shifting means 53 that shifts in the direction parallel to the axis A of the main shaft 22 as in the conventional example. I am doing so.

The cam plate 34 is pivotally supported by a bearing or the like in the main body 30 and is disposed at the tip of a cam shaft 35 that is rotatably disposed by the rotation drive mechanism 36 via a flange 35a.
The main body 30 is arranged on the frame 6 so that the axis B of the cam shaft 35 coincides with the axis A of the main shaft 22.

  In the roller mounting base 33 on which the squeezing roller R is disposed, a guide pin 33a protruding from the lower surface is fitted into a spiral groove 34a engraved on the cam plate 34, and as shown in FIGS. The cam plate 34 is slidably disposed in a groove 31 a formed on the surface of the face plate 31 so as to move in a direction perpendicular to the axis A of the main shaft 22 as the cam plate 34 rotates.

  The number of roller mounts 33 provided on the face plate 31 is not particularly limited, but in the present embodiment, an example is shown in which three rollers are provided at intervals of 120 degrees on the circumference.

Thus, when processing the workpiece W, the workpiece W is held and fixed by the holding mechanism 21 disposed at the tip of the main shaft 22, and the axial direction shifting means 53 of the tool mounting mechanism 3 is moved while the main shaft 22 is rotated by the drive motor M. The numerical control motor 37 of the rotation drive mechanism 36 is rotated and decelerated while the squeezing roller R is moved in a direction parallel to the axis A of the main shaft 22 relative to the workpiece W (X direction in the figure). The cam shaft 35 is rotated at a low speed by the machine 38.
As a result, the cam plate 34 rotates, and the guide pin 33a protruding from the roller mounting base 33 is perpendicular to the axis A along the spiral groove 34a of the cam plate 34 (in FIG. The drawing roller R is pressed against the peripheral surface of the workpiece W, and the tip of the workpiece W is drawn.

  The drawing apparatus of the present invention has been described based on the embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations are appropriately changed without departing from the spirit of the present invention. It is something that can be done.

  The drawing apparatus of the present invention has a characteristic that a drawing can be efficiently performed with a plurality of drawing rollers by rotating a workpiece, and is therefore suitable for use in a drawing apparatus in which a reduction in cycle time is desired. Can be used.

1 is an overall view showing an embodiment of a drawing apparatus of the present invention. It is a partial cross section figure of the tool attachment mechanism used for the drawing apparatus of this invention. It is a top view which shows the initial state of the tool mounting base for drawing. It is a top view which shows the movement state of the tool mounting base for drawing. It is a general view which shows the conventional drawing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drawing apparatus 2 Spindle mechanism 22 Spindle 21 Grasp mechanism 3 Tool attachment mechanism 30 Main body 31 Face plate 33 Roller mounting base 33a Guide pin 34 Cam plate 34a Spiral groove 36 Rotation drive mechanism 37 Numerical control motor 38 Reduction gear

Claims (2)

  In a drawing apparatus comprising a spindle mechanism having a gripping mechanism for gripping a workpiece at the tip of the spindle, and a tool mounting mechanism arranged to face the spindle mechanism, the tool mounting mechanism is made up of a cylindrical main body, A face plate disposed on the side of the main body, a plurality of roller mounts disposed on the face plate so as to be movable in a direction perpendicular to the axis of the main shaft, and a spiral shape in which guide pins protruding from the roller mounts are fitted. It is composed of a cam plate with grooves and a rotation drive mechanism that rotates the cam plate, and the roller mounting base is moved in a direction perpendicular to the spindle axis as the cam plate rotates. A drawing device.   2. The drawing apparatus according to claim 1, wherein the camshaft rotational drive mechanism comprises a numerically controlled motor and a speed reducer.

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