Metal deforming – By use of tool acting during relative rotation between tool... – Tool orbiting or rotating about an axis
Reexamination Certificate
2000-06-28
2001-10-02
Tolan, Ed (Department: 3725)
Metal deforming
By use of tool acting during relative rotation between tool...
Tool orbiting or rotating about an axis
C072S112000, C072S452100
Reexamination Certificate
active
06295856
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a spindle mechanism in a drawing system used mainly for the drawing of pipe tips, etc.
BACKGROUND ART
Conventionally, as a drawing system for performing the drawing of cylindrical members such as pipe tips, etc., a working system is attempted which consists of slidably supporting a drawing tool in a radial direction on a drawing tool mounting base attached to the tip of the turning spindle, and thereby performing the drawing work.
In such a case, as a means of moving the drawing tool supported on the drawing tool mounting base in a radial direction, a structure is adopted in which a cam plate is provided for moving the drawing tool in a radial direction on the drawing tool mounting base. The mounting base is attached to the tip of the spindle, while, on the other hand, the cam plate is attached to the tip of the cam shaft in which to insert the spindle. The cam shaft transmits rotation from the spindle through a differential gear mechanism.
In addition, a differential gear mechanism is generally constructed by using a planetary system as disclosed in JP, 3-8412, B, for example, in which a plurality of planetary gear mechanisms are connected in series with the spindle and the cam shaft. The spindle and cam shaft turn at the same rotating speed for normal work, while the rotating speed of the cam shaft is changed, with the use of planetary gear mechanisms, when moving the drawing tool in the radial direction.
However, a mechanism of this construction had various problems, such as the necessity of having a large number of component parts, a problem with durability due to the complicated structure and the necessity of constantly turning the planetary gears at high speed, poor accuracy in the final casting shape due to the fact that a mandrel inserted in the raw material forms an integral body with the spindle and turns, advances and retreats together with the spindle, etc.
Moreover, while it is desirable, to secure final shape accuracy at the reduced diameter parts of casting, to make the tip of the mandrel protrude near the roller by passing and holding the mandrel through the spindle, there was also a problem of it being impossible to pass and hold the mandrel through the spindle, because two sets of large and heavy planetary gear mechanism are inserted in the auxiliary shaft and there is no way to produce a hollow state in the auxiliary shaft and a spindle there.
DISCLOSURE OF THE INVENTION
In view of such problems with the conventional drawing system, the objective of the present invention is to provide a spindle mechanism in a drawing system capable of reducing the number of component parts, and improving the durability and the accuracy of final casting shape with a mandrel device, by utilizing a compact speed-change mechanism.
To achieve the objective, a first invention is a spindle mechanism in a drawing system, comprising, at the tip of the spindle, a drawing tool mounting base for slidably supporting a drawing tool in a radial direction. At the tip of a cam shaft inserted concentrically with the spindle is a cam plate for moving the drawing tool in a radial direction. The spindle and cam shaft are engaged with each other through a speed-change mechanism, while in the speed-change mechanism is disposed in parallel with the spindle and cam shaft. The spindle and cam shaft are comprised of hollow shafts.
The present invention constructed as described above enables, by the spindle and cam shaft having hollow shafts, the insertion of a small-diameter shaft in a large-diameter shaft, and the insertion of a variety of members in the small-diameter shaft, without being affected by rotation and forward and backward movements of the shafts.
Moreover, a second invention is characterized in that in the first invention, a mandrel to be inserted in the object material for processing is inserted into a small-diameter hollow shaft in such a way that it can move forward and backward.
The present invention constructed as described above is capable of easily performing the insertion of the mandrel into the pipe to be processed at the time of drawing, by having a mandrel supporting bar inserted in such a way that it can move forward and backward.
Furthermore, a third invention is a spindle mechanism in a drawing system comprising, at the tip of the spindle, a drawing tool mounting base for slidably supporting a drawing tool in a radial direction, At the tip of a cam shaft inserted concentrically with the spindle is a cam plate for moving the drawing tool in a radial direction. The spindle and cam shaft are engaged with each other through a speed-change mechanism, where in the speed-change mechanism is comprised of a deflection working type drive transmission device, disposed in parallel with the spindle and cam shaft.
The present invention constructed as described above operates the speed-change mechanism, when moving the drawing tool in a radial direction, to change the rotational speed of the cam shaft which drives the cam plate at a speed different from the rotational speed of the spindle.
Still more, a fourth invention is characterized in that, in the third invention, the deflection working type drive transmission device is comprised of a pair of outer rings linked to the spindle and the cam shaft, respectively, gear rings biting with tooth spaces formed on the inner face of the respective outer rings and forming tooth profiles different in the number of teeth, and a waving ring for supporting the gear rings to make them bite with the tooth spaces at two points opposing each other, so as to change the rotational speed of the cam shaft a prescribed amount against the rotational speed of the spindle with rotations of the waving ring, to thereby rotate the cam plate and move the drawing tool in the radial direction.
The present invention constructed as described above enables the drawing tool to move in the radial direction as the speed-change mechanism turns the waving ring supporting the gear rings in an oval shape and the cam plate turns against the main mounting base depending on the number of turns of the waving ring.
In addition, a fifth invention is characterized in that, in the third or fourth inventions, the spindle and cam shaft are comprised of hollow shafts.
The present invention constructed as described above makes it possible, by the spindle and cam having hollow shafts, to insert a small-diameter shaft into a large-diameter shaft and to also insert a variety of members in the small-diameter shaft without their being affected by rotation or the forward and backward movements of the shafts.
Moreover, a sixth invention is characterized in that, in the fifth invention, a mandrel to be inserted in the object material for processing is inserted in a small-diameter hollow shaft in such a way that it can move forward and backward.
The present invention constructed as described above is capable of easily performing the insertion of a mandrel into the pipe to be processed at the time of drawing by having a mandrel supporting bar inserted in such a way that it can move forward and backward.
Furthermore, a seventh invention is characterized in that, in the second or sixth inventions, the mandrel is supported by a fixed arm mounted on the base of the drawing system. It is moved forward and backward by a drive means for forward and backward movement, regardless of the transfer of the spindle mechanism to the base.
The present invention constructed as described above makes it possible for the mandrel to be held in a stopped state in the object material to be processed without following the forward and backward movement along the base of the spindle mechanism.
An eighth invention is characterized in that, in the seventh invention, an outer cylinder coaxially connected to an end of the cam shaft and an inner cylinder inserted on the outer circumferential face of the mandrel in a way to allow transfer in an axial direction are linked to each other through a bearing in a way to allow free relative rotation.
The present invention constructed as d
Murata Sigeo
Tobimatsu Masakazu
Sango Co. Ltd.
Tolan Ed
Wenderoth , Lind & Ponack, L.L.P.
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