JPH0227931Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an automatic spinning machine that repeatedly draws a rotating thick-walled cylindrical member into a desired shape based on a large gauge. It is.

[Prior art] Conventionally, in multi-cycle processing using the small servo mechanism of an automatic spinning machine, for example, a plurality of auxiliary gauges that determine each drawing movement are stacked on a fixed finishing gauge plate, and the auxiliary gauges are sequentially Perform rough machining first, and remove the auxiliary gauge by sliding it in one direction sequentially using a transfer hydraulic cylinder, etc., or
Alternatively, a method is adopted in which rotation is applied to one fulcrum as a base point to sequentially remove the parts, and an electric signal is obtained from the next auxiliary gauge for the servo mechanism.

[The problem that the idea aims to solve]

However, in either case, it is necessary to accurately stack a plurality of multi-cycle drawing auxiliary gauges on top of the finishing gauge, and to provide a drive device or the like to move them sequentially. Depending on the shape of the gauge, there may be restrictions on the combination of these multi-cycle drawing auxiliary gauges.

In addition, the relative positions of each auxiliary gauge and finishing gauge are adjusted by changing the mounting position of the guide, changing the rotational fulcrum position, etc., but these require extremely skill, time, and effort. There are drawbacks.

In view of this, the present invention aims to make it possible to arbitrarily adjust the degree of aperture without requiring replacement of the gauge.

[Means for Solving the Problems] To achieve the above object, the automatic spinning machine of the present invention uses a small servo mechanism to reciprocate a drawing tool with respect to a rotated cylindrical workpiece. An automatic spinning machine that repeatedly draws into a desired shape is equipped with a finishing gauge for setting the finishing forming that determines the finished shape, and an auxiliary gauge for setting the auxiliary forming that sets the transition locus of the drawing tool. The gauge is equipped with a position detector installed on a traveling platform on which the drawing tool is attached, and the drawing tool is connected to a long servo mechanism attached to the traveling platform, and the position detector for the auxiliary gauge is equipped with a position detector that increases the amount of drawing. A calculation signal device that provides a signal is installed, and the external signal from the calculation signal device is selectively added to the temporary signal from the position detector for the auxiliary gauge to create the auxiliary gauge signal, and this signal is used to control the temporary servo mechanism. The device is operated to perform auxiliary drawing processing, and also performs finishing processing by a rapid movement relative to the finishing forming means.

[Effect]

By appropriately selecting the aperture amount increase signal from the arithmetic signal device, it is possible to arbitrarily change the auxiliary gauge signal obtained by adding the ephemeral signal from the position detector to the auxiliary gauge. That is, one auxiliary gauge can cause the squeezing roller to draw an arbitrary travel trajectory.

〔Example〕

In the figure, 1 is a spinning processing machine, and this processing machine 1 has a main shaft 2 rotated by an appropriate driving source, a tail stock 3 facing the main shaft, and an appropriate driving means disposed between the two and along the axis. The cutting tool mount 5 is provided above the running table 4a and the tail stock 3, which move back and forth. The traveling base 4a is equipped with a pair of forming roller mounting bases 4b and 4c which are provided perpendicularly to the processing machine axis with the thick-walled tubular workpiece W held between the main shaft 2 and the tail stock 3 in between. Mounting stand 4b,
The rollers 4c move forward and backward at the same time and the same distance relative to the workpiece W by means of a link mechanism 4d, and one of the roller mounting bases 4b is equipped with a driving hydraulic servo mechanism 6. In addition, in order to simplify the drawing, the forming roller and the cutting blade are not shown.

This processing machine 1 includes a finishing gauge A as the finishing forming setting means, an auxiliary gauge B as the auxiliary forming setting means, and position detectors 20 and 22 as drawing amount searching means provided opposite to each of the gauges A and B. At appropriate locations in the main body 1 of the processing machine, there are mounting bases 7 for a finishing gauge A, a finishing dog C for determining the left and right ends to which the traveling table 4a moves, and an auxiliary dog D.
and a mounting base 8 for the auxiliary gauge B, and a traveling base 4a.
is provided with a limit switch mounting arm 10 for the dogs C and D, a mounting base 11 for a position detector 20 for the finishing gauge, and a mounting base 12 for a position detector 22 for the auxiliary gauge.

As the position detectors 20 and 22, for example, potentiometers are used, and the intermediate tap is set to be always pushed forward by a spring, and the sensors 21 and 23 are attached to the tips of the intermediate taps, respectively, and these are connected to each gauge. The position and displacement are detected as voltage changes.

In addition, adjust the neutral position of the potentiometer with respect to the finishing gauge and the auxiliary gauge in advance so that the mechanical and electrical neutral positions of both coincide, and then determine the relative position from the forming roller. .

An example of the finishing gauge A, auxiliary gauge B, finishing dog C, and auxiliary dog D is shown in FIG.

The finishing gauge A has the shape to be formed, the auxiliary gauge B has the shape that determines the movement of the roller during drawing, that is, the shape that is suitable for ironing, and the auxiliary dog D determines the end point position of the drawing roller. The finishing dog C determines the squeezing start position of the roller. In the illustrated example, the diameter is smaller on the right side (tail stock side), so the finishing gauge A gradually decreases in height along a predetermined curve as it approaches the right side. The finishing dog C also has a shape similar to this.

Further, the height of the auxiliary gauge B is gradually increased as the ironing process progresses toward the right side along a predetermined curve so that the drawing amount is gradually decreased as the ironing process progresses toward the right. When the limit switch LS1 corresponding to the auxiliary dog D is activated, the aperture head 4 is moved to the main shaft 2 side, and when the limit switch LS2 corresponding to the finishing dog C is activated, the aperture head 4 is moved in the forwarding direction, that is, to the tail stock 3 side. It is something that forces you to do something.

The figure shows the related arrangement of the limit switches LS1 and LS2, and the potentiometers (position detectors) 20 and 22, which are arranged in relation to each other. That is, the potentiometer 20,
22 aligns their mutual neutral positions as mentioned above,
The respective reference planes of the finishing gauge A and the auxiliary gauge B, that is, the straight line portions A1 and B1 in the illustrated example, are installed at the same level with respect to the potentiometer, the finishing dog C is installed at approximately the same position as the finishing gauge A, and the auxiliary dog D is installed at approximately the same position as the finishing gauge A. is at the end position of the drawing roller, specifically, the straight line part D1 parallel to the machine base is at the position where the drawing roller should come into contact when it leaves the material, and the final end D2 is at the rightmost end of the drawing process. Set.

The electrical signals from the potentiometers 20 and 22 are converted into the amount of oil supplied to the hydraulic servo mechanism 6, and both are operated to return to the neutral position. A signal to be caused to advance in continuous or discontinuous steps, that is, an addition signal to which a signal to increase the amount of aperture is added, is selected from the signal device 51 (FIG. 7) and applied to the hydraulic servo mechanism 6.

Next, the drawing procedure using the processing machine of the present invention will be explained based on FIGS. 5 and 6.

Fig. 5 shows the order of the processing steps, and Fig. 6 is an explanatory diagram of the drawing process, that is, the movement locus of the drawing roller. Press and draw. In this case, the squeezing roller R is first moved in accordance with the signal from the auxiliary gauge B. As mentioned above, the auxiliary gauge B determines the movement of the roller for the drawing process, and in this example, it is designed to make the stretching or ironing action as effective as possible, and the signal from the position detector 22 is The amount of aperture decreases as you move to the right. That is, in FIG. 6, it moves from point R to auxiliary gauge B along auxiliary gauge curve b. However, since the above-mentioned throttling amount increase signal from the outside is applied continuously, and therefore the sum of both signals becomes the auxiliary gauge signal and this is applied to the hydraulic servo mechanism 6, the slope is slightly gentler than the above-mentioned auxiliary gauge curve b. Transitioning along the transition line P1, forming FIG. 5b. When the limit switch LS1 comes into contact with the auxiliary dog D, that is, when the line D in FIG. 6 is reached, the aperture stand 4 moves backward. In this case, when no throttle increase signal is applied from the outside, the gauge returns to be parallel to the auxiliary gauge curve b, but when this increase signal is applied, the sum of both signals causes the throttle to increase from curve b along the transition line P2. Go back. In this case, a feature of spinning processing is that the material is stretched toward the free end even during this backward movement.

When the limit switch LS2 provided in the aperture stand 4 comes into contact with the finishing dog C, the direction of movement of the aperture stand is changed again, and similarly, by applying an external aperture increase signal, the aperture amount becomes larger than line b. Transition along line P3.

Note that although the above example has been exemplified in which a forward movement (aperture increase) signal is continuously added from the outside, this forward movement signal may be added intermittently. For example, when going to the right, the auxiliary gauge signal combined with the above-mentioned aperture amount increase signal moves along the transition line P1 (or a line similar to this), and then going back (leftward).
In this case, the provision of the forward movement signal may be stopped, and only the signal from the position detector 22 for the auxiliary gauge B may be used as the auxiliary gauge signal, and the vehicle may go back along the line b. Or conversely, the addition of the forward signal may be stopped when the vehicle is moving to the right, and the signal may be added only when the vehicle is going back. Alternatively, the magnitude of the numerical value of the advance signal may be selected as appropriate.

Then, by repeating this process, the drawn products W2 as shown in Fig. 5C, D, etc. are obtained depending on the order. When approaching the finished dimension, there is a risk that the drawing process will be less than the finished dimension due to improper installation of the auxiliary gauge, but in order to prevent this, draw either the auxiliary gauge B or the finishing gauge A, whichever is closer, as described below. The switching is automatically performed by an electrical comparator circuit.

Next, the electric circuit diagram shown in FIG. 7 will be explained in order to carry out the above operation.

At the time of starting, a command signal from the external command device 50 is applied to the position detector 20 provided opposite to the finishing gauge A, the position detector 22 provided opposite to the auxiliary gauge B, and the calculation signal device 51. The arithmetic signal unit 51 is the aforementioned external command signal generator, and generates a continuous output signal or an intermittent output signal.

An adder 52 adds a calculation signal C from the calculation signal unit 51 to the detection signal b of the auxiliary gauge position detector 22, such as a pulse signal, a step signal, an integral waveform signal, an extremely low frequency sine wave, and other constant voltage waveforms. The auxiliary gauge signal e is synthesized and waveform-shaped by an amplifier 53 which also serves as a phase adjustment.

In this case, the calculation signal C determines the sliding amount of the auxiliary gauge signal in the forward direction of the forming roller R, and is the electrically and mechanically effective amount by which the intermediate tap can be pushed in from the neutral point of the auxiliary gauge position detector 22. Set the maximum signal so that it does not exceed (length).

After adjusting the gain of the amplifier 53 so that the output signal and resolution of the finishing position detector 20 corresponding to the finishing gauge A and the output signal resolution of the auxiliary gauge position detector 22 are at the same level, each signal a ，
e is applied to servo amplifiers 54 and 55. At the same time, the position signals a' and e' are also input to the comparator 56, which detects the relative position of the finishing gauge position and the auxiliary gauge position, and gives priority to the gauge signal of the roller closer to the advancing aperture stand. output. This output is for switching between working as a finishing gauge and as an auxiliary gauge.
However, the amount of movement of the forming roller, that is, the hydraulic servo mechanism 6
As described above, the effective amount by which the intermediate tap can be pushed in from the neutral point of the auxiliary gauge position detector 22 is limited. This output passes through an integrator 57 for preventing chattering, is amplified and shaped by an amplifier 58, and then an output m is applied to a switching output generator 59, and a switching output n is applied to a switch 60.
The finish gauge signal a input to the servo amplifier 54 as the displacement signal is compared with a reference level, and a signal f is generated to return the position detector 20 to the neutral position, and is applied to the current amplifier 61. It is applied to the switching device 60 as the servo valve input current g'. Similarly, the auxiliary gauge addition signal e, which is applied as a displacement signal to the servo amplifier 55, is compared with the reference level so that the position detector 22 is shifted to a balance point by the shift of the calculation signal c (Note 6).
In the figure, transition lines P1 to P4 are the balance points) A signal h is generated and applied to a current amplifier 62, and a servo valve input current j is applied to a switch 60.

The switching device 60 is switched by the above-mentioned switching signal n, and the priority servo signal t is applied to the electro-hydraulic servo valve 63 to drive the hydraulic cylinder 64, and the drawing process is performed by the movement of the molded product roller R according to the selected priority gauge. Let's do it. In addition, the limits of right and left movement with respect to the aperture table 4 regarding horizontal feed are set by limit switches LS1 and LS2 by a transition circuit separate from the above electric circuit.
This is done by switching.

In the figure, 65 is a finishing external switch for switching the switch 60 for the final finishing and applying the output of the finishing position detector 20 to the electro-hydraulic servo valve 63, and 66 is for controlling the movement of the drawing head at each position. Detector 2
The feedback is given to the intermediate taps of 0 and 22 as the amount of change from the gauge.

[Effect of idea]

According to the present invention, a finishing forming setting means and an auxiliary forming setting means are used, and a signal current is applied from the outside to the auxiliary forming setting means, and the forming roller is initially controlled by the output from the detector by the auxiliary forming setting means. On the other hand, the drawing process is repeated by moving the workpiece forward and backward using a signal current generated by selective addition of external signal currents, thereby performing so-called multi-cycle processing.The relative position between the finishing position and the auxiliary position is detected, and the workpiece is moved forward. This system gives priority to the signal closest to the aperture stand and shifts accordingly.
Since the degree of drawing in multi-cycle processing can be arbitrarily adjusted using an external signal, there is no need to manufacture and set a large number of auxiliary gauges and drive devices for these during conventional drawing processing, making fine adjustment of drawing processing possible. This method has advantages such as easy operation and simplification of the entire device.

[Brief explanation of the drawing]

Figure 1 is a plan view of the entire spinning machine, Figure 2
The figure is a right side view, Figure 3 is a front view, Figure 4 is an explanatory diagram of the relationship between each gauge and dog, Figure 5 is a process diagram,
FIG. 6 is an explanatory diagram of the drawing operation, and FIG. 7 is a block electric circuit diagram. 1... Spinning machine, 20... Finishing gauge position detector, 22... Auxiliary gauge position detector, A
...Finishing gauge, B...Auxiliary gauge, C...Finishing dog, D...Auxiliary dog, W...Workpiece.

Claims (1)

[Scope of utility model registration request] A finishing forming setting that determines the finished shape of an automatic spinning machine that moves a drawing tool back and forth on a rotating cylindrical workpiece using a small servo mechanism and repeatedly draws it into the desired shape. The drawing tool is equipped with a finishing gauge and an auxiliary forming setting auxiliary gauge that sets the transition locus of the drawing tool.Each gauge is equipped with a position detector installed on the traveling base on which the drawing tool is attached, and the drawing tool is In addition to being connected to the tiny servo mechanism attached to the stand, the position detector for the auxiliary gauge is also equipped with a calculation signal device that gives a signal to increase the aperture amount, and calculates the signal from the position detector for the auxiliary gauge. It is characterized by selectively adding together an external signal from a signal device to obtain an auxiliary gauge signal, which operates a large servo mechanism to perform auxiliary drawing processing, and also performs finishing processing by a small movement relative to the finishing forming means. Automatic spinning processing machine.