JPH0730190Y2 - Coiling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a coil ring machine, and more particularly to a coiling machine for manufacturing a coil spring.

(Prior Art) Conventionally, this type of coiling machine has a bending die, a feeding unit that feeds a wire rod to the bending die through a guide member as set, and a wire rod feeding direction front side of the bending die that feeds the wire rod. And a pitch tool that applies a predetermined pitch by pressing, and by feeding the wire rod to the bending die side as set by the feeding means, the wire rod is brought into contact with the bending die, and the wire rod is wound into a ring shape. Turn,
In addition, a coil spring is formed by winding a predetermined number of turns in a state where a predetermined pitch is given by pressing the wire rod in a direction orthogonal to the wire rod feeding direction by the pitch tool as set.

(Problems to be solved by the invention) However, in the above-described conventional coiling machine, the winding of the wire rod around the accommodation drum (the winding start portion and the winding end portion of the wire rod around the accommodation drum) (Change in winding diameter), and because there is variation in the thickness of the wire rod or the hardness of the wire rod, the pitch width varies due to the pitch tool, and the free length of the coil spring varies with the feed amount of the wire rod. For this reason, there is a problem that it is necessary to measure the free length of each coil spring and perform a sorting operation for defective products.

An object of the present invention is to provide a coiling machine capable of making a free length of a coil spring constant regardless of winding of a wire around a housing drum and variations in thickness of the wire or hardness of the wire. is there.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a bending die (3) and a guide member (4) on the bending die (3).
And a pitch tool (6) for pressing the wire at a front side of the bending die (3) in the wire-dispatching direction to give a predetermined pitch. In the coiling machine, a sensor (7) for measuring the distance between the first moving mechanism (60) for moving the pitch tool (6) in a direction orthogonal to the feeding direction of the wire and the tip of the coil spring to be molded. ), A second moving mechanism (70) for controlling the movement of the sensor (7) in the same direction as the tip of the coil spring moves when the coil spring is molded, and when the coil spring is molded, A reference value for moving the tip of the coil spring is stored, and the first output unit (81) and the sensor (7) for giving a drive instruction to the second moving mechanism (70) based on the reference value. The and the distance between the tip portion of the coil spring to be formed with the sensor (7) based on the results of measurements to be output becomes constant first
A control device (8) having a second output section (70) for giving a drive instruction to the moving mechanism (60) is provided, and the interval is set to an interval within the sensing capability range of the sensor (7).

(Operation) With the above configuration, when the coil spring is molded, the second moving mechanism (70) is driven based on the reference value stored in advance,
The sensor (7) is moved at the speed based on the reference value in the same direction as the moving direction of the tip of the coil spring to be molded, and based on the result of the measurement value of the interval by the sensor (7), The pitch moving tool (6) is driven by driving the first moving mechanism (60) so that the distance between the sensor (7) and the tip of the coil spring to be molded becomes constant.
Is moved to correct the predetermined pitch of the coil spring to be molded, so that the correction can be performed with high accuracy.

Moreover, since the distance between the sensor (7) and the tip of the coil spring to be molded is set within the range of the sensing ability of the sensor (7), this sensor is irrespective of the type of the sensor (7). Highly accurate defect detection that effectively utilizes the characteristic of (7) becomes possible, and correction can be performed based on this highly accurate defect detection.

Moreover, since the sensor (7) is moved, the free length error of the coil spring to be molded can be accurately detected regardless of the length of the coil spring to be molded.

(Embodiment) FIG. 1 and FIG. 2 show a coiling machine according to the present invention, in which a storage drum (1) having a wire (A) wound therein is disposed on one side of the coiling machine. (1)
A pair of first and second rolls (21) (22) vertically opposed to each other as a feeding means (2) for the wire (A) at a lateral position of the
And a bending die (3) for applying a winding force to the wire (A) in the winding direction is disposed on the front side of the rolls (21) (22) in the wire feeding direction. A guide member (4) for the wire (A) is provided between the feeding means (2) and the feeding means (3).

Further, between the guide member (4) and the bending die (3), a core metal (5) for cutting a wire is arranged at a position facing the bending die (3), A pitch tool (6) for setting the pitch of the coil spring to a predetermined pitch is provided at a position facing the cored bar (5) on the delivery side of the wire (A) with respect to (3).

A guide surface (51) having a semicircular cross section and a cutting blade surface (52) are formed on one end of the core metal (5) as shown in FIG. 2, and the blade surface (52) is formed. A cutting blade (53) that cuts the wire rod (A) when the wire rod (A) is fed by a certain amount to a position opposite to is disposed so as to move back and forth with respect to the core metal (5).

Then, the pitch tool (6) is provided with a first moving mechanism (8) mainly composed of a ball screw (61) and a first servomotor (62), and the pitch tool (6) is connected to the wire rod (A). The movement is controlled in a direction orthogonal to the feeding direction of the.

Further, for example, a capacitance type sensor (7) for measuring a distance from a tip end portion of a coil spring to be formed is provided at a position of the pitch tool (6) facing each other across the wire (A). The sensor (7) is supported by the second moving mechanism (70) such that the sensor (7) can be moved and controlled in the same direction as the moving direction of the tip end of the coil spring when the coil spring is formed.

A ball screw (71) and a servomotor (72) are mainly used as the second moving mechanism (70).

Further, in FIG. 1, (8) stores a reference value for moving the tip of the coil spring at the time of molding the coil spring, and a first output section (giving a drive instruction to the second moving mechanism (70) ( 81) and the first moving mechanism (60) so that the distance between the sensor (6) and the tip of the coil spring to be molded becomes constant based on the result of the measurement value output from the sensor (6). And a second output section (82) for giving a drive instruction to the control device.

As the reference value stored in the control device (8), the coil diameter set by the bending die (3) and the core metal (5), and the rotation of the first and second rolls (21) (22) Feed rate of wire rod (A) and pitch tool (6)
It is set based on the pitch set according to the shape and the forming speed determined according to the shape of the coil spring having flat portions at both ends or the coil spring having no flat portions as shown in FIG. The reference value of the seed is stored.

For example, in the case of a coil spring having flat portions at both ends shown in FIG. 3 (a), as shown in FIG. 3 (b), the movement amount per time when the tip of the coil spring moves is used as a reference value. In the case of a coil spring that is stored and has no flat portion as shown in FIG. 4 (a), as shown in FIG. Remember it.

Further, when the sensor (7) is moved based on this reference value, a fixed interval within the sensing ability range of the sensor (7) is set between the tip of the coil spring to be molded. .

Further, a feed amount setting device (9) and a pitch setting device (10) are connected to the input side of the control device (8), and by the set values by both these setting devices (9) (10), A predetermined reference value is read from the reference values stored in the control device (8), and the first output unit (81) reads the second movement mechanism (70).
To give a driving instruction to.

The present invention is configured as described above. When a coil spring is manufactured by the coiling machine,
First, the feed amount of the wire (A) is input to the feed amount setting device (9), and the pitch of the coil spring to be molded is input to the pitch setting device (10).

Based on the values set by both of these setters (9) and (10), a reference value stored in advance in the control device (8) based on the coil diameters of the bending die (3) and the core metal (5). A predetermined reference value is read out from the inside, and a drive instruction is given from the first output section (81) of the control device (8) to the second moving mechanism (70), and at the same time, it is set by the feeding means (2). The wire rod (A) is sent out from the exit of the guide member (4) to the bending die (3) side with a predetermined feed amount, and the wire rod (A) is wound around the outer periphery of the cored bar (5) by the bending die (3). .

Then, the second moving mechanism (70) is driven according to the driving instruction from the first output section (81) according to the reference value for moving the tip of the coil spring to be molded, and the second moving mechanism (7) is moved.
The sensor (7) provided in 0) moves in the direction in which the tip of the coil spring moves, that is, in the coil spring molding direction.

The sensor (7) moves at a predetermined fixed interval when the molding by the pitch tool (6) is correct, but the pitch tool (6) moves.
If the molding due to is wrong, it will move away or approach.

In this case, the gap of the gap is measured by the sensor (7) and based on the measurement result, the gap (H) between the sensor (7) and the tip of the coil spring to be molded becomes constant. Pitch tool (6) first moving mechanism (6
0) is controlled by the control means (8).

By controlling the first moving mechanism (60), the pitch tool (6) is moved in the wire feed direction so that the movement of the sensor (7) and the movement of the tip of the coil spring always coincide with each other. It is moved in the orthogonal direction.

As a result, the wire (A) can be accurately corrected without being affected by winding around the storage drum (1), variation in the thickness of the wire (A), hardness of the wire (A), and the like. Therefore, it is possible to manufacture a high-quality coil spring with a small error.

Moreover, since the distance between the sensor (7) and the tip of the coil spring to be molded is set within the range of the sensing ability of the sensor (7), this sensor is irrespective of the type of the sensor (7). It is possible to detect defects with high accuracy by effectively utilizing the characteristic of (7), and it is possible to correct the defects based on the detection of defects with high accuracy, so that the accuracy of the correction can be improved.

Moreover, since the sensor (7) is moved, the free length error of the coil spring to be molded can be accurately detected regardless of the length of the coil spring to be molded.

It should be noted that according to the above-described embodiment, the coil spring having an accurate free length can be manufactured as described above, but the coil diameter may change due to the above-described error of the wire (A). That is, if there is no error in the feed amount of the wire (A), the number of turns changes, and the cut end to be cut and the cut end position previously cut change.

Therefore, after the wire feeding is completed, the positions of both cut ends are inspected, and if the number of windings is large, it can be determined that the coil diameter is small, and if the number of windings is small, the coil diameter is large. ) It is preferable to provide correction means for changing and correcting the position because the correction by the correction means can prevent the production of defective coil diameters.

(Effect of the Invention) As described above, according to the present invention, when the coil spring is formed, the second moving mechanism (7) is formed based on the reference value stored in advance.
0) is driven to move the sensor (7) in the same direction as the moving direction of the tip of the coil spring to be molded at a speed based on the reference value, and the measured value of the interval by the sensor (7). Based on the result of (1), the first moving mechanism (60) is driven to move the pitch tool (6) so that the distance between the sensor (7) and the tip of the coil spring to be molded becomes constant, Since the predetermined pitch of the coil spring to be molded is corrected,
It is possible to manufacture a high-quality coil spring that can be corrected with high accuracy and has a small error.

Moreover, since the distance between the sensor (7) and the tip of the coil spring to be molded is set within the range of the sensing ability of the sensor (7), this sensor is irrespective of the type of the sensor (7). It becomes possible to detect defects with high accuracy by effectively utilizing the characteristic of (7), and it is possible to correct the defects based on the detection of defects with high accuracy, so that the accuracy of the correction can be improved.

Moreover, since the sensor (7) is moved, the free length error of the coil spring to be molded can be accurately detected regardless of the length of the coil spring to be molded.

[Brief description of drawings]

1 is a plan view schematically showing the entire structure of a coil ring machine according to the present invention, FIG. 2 is a front view of the same portion omitted, and FIG.
FIG. 4 is a coil spring having a flat portion and its reference value explanatory view, and FIG. 4 is a coil spring having no flat portion and its reference value explanatory view. (2) …… Feeding means (3) …… Bending die (4) …… Guide member (5) …… Core metal (6) …… Pitch tool (60) …… First moving mechanism (7) …… Sensor (70) …… Second moving mechanism (8) …… Control device (81) …… First output section (82) …… Second output section

Claims (1)

[Scope of utility model registration request] 1. A bending die (3) and the bending die (3).
A means (2) for feeding the wire rod in a set manner via a guide member (4), and a pitch tool for pressing the wire rod at a front side in the wire rod feeding direction of the bending die (3) to give a predetermined pitch ( And a first moving mechanism (60) for moving the pitch tool (6) in a direction orthogonal to the feeding direction of the wire rod,
A sensor (7) for measuring the distance from the tip of the coil spring to be molded, and controlling the movement of the sensor (7) in the same direction as the moving direction of the tip of the coil spring during molding of the coil spring. Second moving mechanism (7
0) and a reference value for moving the tip of the coil spring during molding of the coil spring, and a first output section (81) for giving a drive instruction to the second moving mechanism (70) based on the reference value. ) And the measurement value output from the sensor (7), the first moving mechanism (60) is configured so that the distance between the sensor (7) and the tip of the coil spring to be molded becomes constant. A coiling machine, characterized in that a controller (8) having a second output section (70) for giving a drive instruction is provided, and the interval is set within the sensing capability range of the sensor (7).