JPH0442028Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a defective material detection device in a rotary thread rolling machine, specifically, for use in rolling forming immediately before rolling processing by the rotary thread rolling machine. The present invention relates to a defective material detection device for detecting whether or not the shape of a material is defective.

(Prior art) For example, a so-called rotary thread rolling machine is widely used to form a threaded portion on the outer periphery of the shaft of a bolt material used as a rolling material that has been previously formed into a predetermined shape by a heading machine or the like. It is being This rotary screw rolling machine is, for example,
As shown in Publication No. 20412, a circular rotary die with a large number of thread grooves formed on the outer circumferential surface and an arc-shaped stationary die with a large number of thread grooves formed on the inner circumferential surface are rotated at a predetermined level. It has a material supply mechanism that is disposed facing each other across the rolling space and supplies the bolt material to the starting end side of the rolling space, and intermittently supplies the bolt material into the rolling space through the supply mechanism. A predetermined threaded portion is formed on the shaft portion of the bolt material while the bolt material is rolled toward the terminal end of the rolling space as the rotary die rotates. .

(Problem to be solved by the invention) By the way, as a material supply mechanism for supplying bolt materials into the rolling space as described above, a hopper and a hopper, which supply a large number of bolt materials formed in a predetermined shape in advance, are used. It is composed of a material supply chute installed between the starting end side of the rolling space and a material pressing mechanism that intermittently supplies the bolt material flowing down on the chute into the rolling space. The bolt material is automatically fed onto the material supply chute by a parts feeder installed in the bolt material, and the material is sequentially transferred to the starting end side of the rolling space between the fixed die and the rotating die through the supply chute, By supplying the bolt material that has reached the starting end of the rolling space into the rolling space by the material pressing mechanism, a desired bolt can be continuously formed. Therefore, when rolling a bolt of a different shape or a product with a defective shape due to insufficient processing during the forming of the bolt material using a heading machine, etc., it is necessary to The remaining bolt material may remain in the hopper. Then, the bolt materials with defective shapes and other shapes are fed into the rolling space and mixed with the bolt materials that have been made into the regular shape for rolling the desired bolts, and are rolled together with the regular bolt materials. If the product is shaped and sent out, it is necessary to carry out a 100% inspection of all finished products in order to sort out products with defective shapes and products with other shapes from the legitimate finished products, which requires a lot of time and effort. There was a problem that required .

The present invention deals with the above-mentioned problems.In a rotary screw rolling machine, immediately before the material supply mechanism feeds the material for rolling forming such as bolt material into the rolling space, the material for rolling forming is It is an object of the present invention to provide a defective material detection device for reliably detecting and determining whether or not the shape of a material is defective.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized by the following configuration.

First, the device according to the first claim of the present application (hereinafter referred to as the first device) includes a circular rotary die with a large number of thread grooves formed on its outer circumferential surface, and a large number of thread grooves formed on its inner circumferential surface. An arc-shaped stationary die is arranged to face the rotary die and a predetermined rolling space, and a material supply supplying a rolling material pre-formed into a predetermined shape toward the starting end side of the rolling space. a chute, a stopper member that contacts the rolling material supplied to the starting end side of the rolling space by the chute and restricts the material from entering the rolling space, and a stopper member that prevents the material from entering the rolling space; A defective material detection device for a rotary screw rolling machine equipped with a material supply mechanism having a pusher lever for pushing the forming material into the rolling space from one side of the fixed die, wherein the defective material detection device is provided at the tip of the pusher lever. A base shaft pressing piece that comes into contact with the base shaft of the material when the pusher lever pushes the material for rolling forming and is electrically connected to the stopper member through the material, and a base pressing piece provided at the tip of the pusher lever When the material for rolling forming is pushed by the pusher lever, it comes into contact with a small-diameter shaft portion that is smaller in diameter than the base shaft portion of the material and has a thread groove formed therein, and conducts electricity between the material and the stopper member through the material. The present invention is characterized in that it is provided with a small-diameter shaft pressing piece, and a determination circuit that detects an abnormality in the shape of the shaft of the rolling material when at least one of the pressing pieces is de-energized.

Further, the invention according to the second claim of the present application (hereinafter referred to as the second invention) is similar to the first invention, and includes a material supplying device having a rotating die, a fixed die, a material supplying chute, a stopper member, and a pusher lever. A defective material detection device for a rotary thread rolling machine equipped with a mechanism is provided in the middle of the material supply chute and presses the material for rolling forming that moves on the chute toward the rolling space to detect the material. a pusher lever that changes the direction of movement of the
A base pressing piece provided at the tip of the pusher lever and contacting the base of the material for rolling forming to be electrically connected to the material supply chute via the material; and a base pressing piece provided at the tip of the pusher lever. Pressing the small diameter shaft part, which is made into a smaller diameter than the base shaft part of the material for rolling forming by contacting the small diameter shaft part on which a thread groove is formed, and is energized between the material supply chute and the material supply chute through the material. The present invention is characterized in that it is provided with a determination circuit that determines whether there is an abnormality in the shape of the shaft portion of the material for rolling and forming when at least one of the pressing pieces is in a non-energized state.

Furthermore, the device according to the third claim of the present application (hereinafter referred to as the third device) is provided at the tip of the pusher lever in the first and second devices, and contacts the base portion of the material for rolling and forming. A base shaft pressing piece is energized between the stopper member or the material supply chute through the pusher lever, and a screw groove is formed at the tip of the pusher lever and having a smaller diameter than the base shaft of the rolling forming material. A small-diameter shaft pressing piece that contacts the small-diameter shaft to be electrically connected to the stopper member or the material supply chute via the material; The pusher lever is provided facing each other and is brought into contact or non-contact with the material when the material for rolling forming is pressed by the pusher lever, and is energized or de-energized between the material and the stopper member or material supply chute via the material. a head detecting piece that is in the state, and a head detection piece that is provided at the tip of the pusher lever at a position axially away from the shaft end of the material for rolling and forming, and that comes into contact with the material when the material for rolling and forming is pressed by the pusher lever. an axial length detection piece that is in a energized state or a non-contact state and is energized or de-energized between the stopper member or the material supply chute via the material; and at least one of the pressing pieces and the detection pieces.
The present invention is characterized in that it is provided with a determination circuit that determines whether there is an abnormality in the shape of the material for rolling and forming when the material is in a non-energized state.

(Function) According to the first invention, the material for rolling is pushed by the pusher lever in the material supply mechanism and is supplied into the rolling space from one side of the fixed die, but in this case, When the shaft shape of the rolling material is a regular shape, the base shaft part pressing piece and the small diameter shaft part pressing piece provided at the tip of the pusher lever are the base shaft part and the small diameter shaft of the rolling forming material, respectively. As a result, each of these pressing pieces is energized with the stopper member through the rolling material,
This will be determined by the determination circuit. If there is an abnormality in either the base shaft portion or the small diameter shaft portion of the rolling forming material, either the base shaft portion pressing piece or the small diameter shaft portion pressing pieces is de-energized. This state is detected by the determination circuit, and thereby, an abnormality in the shape of the shaft of the rolling material is reliably detected.

Further, according to the second invention, each of the pressing pieces is provided in the middle of the material supply chute and presses the material for rolling forming that moves toward the rolling space on the chute in the direction of movement of the material. Since it is installed at the tip of the pusher lever that changes the shape of the material, abnormalities in the shape of the shaft of the material for rolling forming are detected during the material supply chute, and the material with the abnormal shape of the shaft is removed from the rolling space. It becomes possible to easily perform processes such as discharging the material midway through the material supply chute before it is supplied to the starting end side.

Furthermore, according to the third invention, in addition to the base shaft pressing piece and the small diameter shaft pressing piece, the tip of the pusher lever is in contact with or in a non-contact state with the head of the material for rolling forming, and the material is pressed. A head detection piece that is connected to the stopper member or the material supply chute through the energization state or de-energized state, and a head detection piece provided at the tip of the pusher lever at a position axially away from the shaft end of the material for rolling forming. and an axial length detection piece that is brought into contact or non-contact with the material and is connected to the stopper member or the material supply chute via the material to be energized or de-energized. , a determination circuit is provided that detects an abnormality in the shape of the rolling forming material when at least one of the pressing pieces and the detecting pieces is de-energized. Similarly, an abnormality in the shape of the shaft of the rolling material can be reliably detected, and an abnormality in the head and shaft length of the material can also be reliably detected.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is an overall plan view of a rotary screw rolling machine equipped with a defective material detection device according to the present invention. ₁ is integrally formed with a circular rotary die 4, and this rotary die 4
is a main shaft 5 driven by a drive source (not shown).
It is designed to be rotated in the direction of arrow A shown in the figure. Further, an arc-shaped fixed die 7, which is disposed opposite to the rotary die 4 with a predetermined rolling space 6 in between, has its back surface abutted against a backup member 8 fixed at a predetermined position on the frame 2. While in contact with each other, the back-up member 8 is fixed by a plurality of fastening fittings 9...9 attached to the back-up member 8, and a rotating member is attached to the inner circumferential surface of the fixed die 7 with the rolling space 6 in between. A large number of thread grooves 3 ₂ facing a large number of thread grooves 3 ₁ formed on the outer peripheral surface of the die 4 are integrally formed. Further, between the starting end side of the rolling space 6 and a hopper (not shown) to which a large number of bolt materials 10...10, which are previously formed into a predetermined shape and are used as materials for rolling, are supplied, A material supply chute 11 is constructed, and bolt materials 10 are fed onto the material supply chute 11 by a parts feeder (not shown) installed in the hopper.
is arranged to move sequentially on the supply chute 11 toward the starting end side of the rolling space 6.

Further, a stopper lever 14 is disposed near one end of the fixed die 7 and is biased by an elastic member 13 housed in a casing 12 fixed on the frame 2 so as to be able to move forward and backward. and
This stopper lever 14 is configured to prevent the bolt material 10 located at the forefront of the material supply chute 11 from inadvertently entering the rolling space 6.

Then, the bolt material 10 at the front row position is
Material pressing mechanism 16 for feeding into the rolling space 6
is structured as follows. That is, this pressing mechanism 16 is a swinging member 17 disposed adjacent to the chute 11 near one end of the fixed die 7.
and a cam member 18 that swings the swinging member 17 at a predetermined timing, and the swinging member 17 supports a pusher lever 19 and a cam follower 20 that comes into contact with the cam member 18. A spring 21 is interposed between one end of the swinging member 17 and a predetermined position of the frame 2 to bias the swinging member 17 in a predetermined direction.

Therefore, with the swinging movement of the swinging member 17 following the rotational movement of the cam member 18, the pusher lever 19 moves forward from the illustrated state at a predetermined timing in synchronization with the rotational movement of the rotary die 4. As a result, the tip of the pusher lever 19 presses the bolt material 10, and the bolt material 10 receiving the pressing force causes the stopper lever 14 to retreat against the urging force of the elastic member 13. As a result, the bolt material 10 is intermittently pushed into the rolling space 6 from one end side of the fixed die 7. The bolt material 10 pushed into the rolling space 6 in this way moves while rolling in the direction of rotation of the rotary die 4 in the rolling space 6, and in the meantime, the bolt material 10 is pushed into the rolling space 6 and moved into the rotating die 4 and the fixed die 7. After the screws corresponding to the respective thread grooves 3 ₁ and 3 ₂ are rolled on the shaft portion 10a of the bolt material 10, they are discharged from the other end of the fixed die 7. Incidentally, near the other end of the fixed die 7, a receiving portion 22 is provided for receiving bolt materials 10...10 having predetermined threads formed thereon.

However, in this embodiment, the defective material detection device 23 is configured as follows. That is, at the tip of the pusher lever 19 constituting the material pressing mechanism 16, as shown in FIG. As shown in FIGS. 2 and 3, the pusher lever 25 is attached to the pusher lever 19 via an insulating plate 27, which is fixed to the pusher lever 19 with two bolts 26, 26. That is, a plurality of bolts 29 . The pusher lever 19 includes a pressing piece 24 and a small-diameter shaft pressing piece 25 that is disposed opposite to the small-diameter shaft 10a' that has a smaller diameter than the base shaft 10a and has a thread groove formed therein.
It is insulated and screwed onto the tip of the Therefore, each of these pressing pieces 24, 25 and the pusher lever 19 are electrically insulated.

Furthermore, a head contact sensor 32 is disposed on the upper side of the base shaft pressing piece 24, and has a detection pin 31 at its tip that is biased by a spring 30 and protrudes freely back and forth. The contact sensor 32 is also insulated and fixed to the pusher lever 19 by a bolt 29 inserted through a long hole 28c formed in the insulating plate 27. Note that the detection pin 31 of this head contact sensor 32 is connected to the base shaft part pressing piece 2 on the base shaft part 10a of the normal bolt material 10 disposed at a predetermined position.
4 abuts, the head 1 of the bolt material 10
It is arranged so as not to come into contact with the side surface of 0b.

On the other hand, also on the lower side of the small diameter shaft pressing piece 25,
An axial length detection sensor 33 having substantially the same structure as the head contact sensor 32 is connected by a bolt 29 inserted into an elongated hole 28d formed in the insulating plate 27.
It is fixed to the pusher lever 19 in an insulated manner. A detection pin 35 is also provided at the tip of the axial length detection sensor 33, and is biased by a spring 34 and protrudes freely back and forth. Note that, as shown in FIG. 2, this shaft length detection sensor 33 detects the above-mentioned detection pin on the small diameter shaft portion 10a' of the bolt material 10 when the bolt material 10 in a normal form is placed at a predetermined position. 35 is attached below and close to the small diameter shaft portion 10a' within a range where the small diameter shaft portion 10a' does not come in contact with the small diameter shaft portion 10a'.

These head contact sensor 32, each pressing piece 24, 25, and each output terminal 36 of the shaft length detection sensor 33 are connected to four output signal lines 37...3
a material abnormality determiner 3 having a determination circuit that detects the quality of the shape of the bolt material 10 in parallel via 7;
8, respectively.

On the other hand, for example, a positive terminal of a direct current 39 is connected to the stopper lever 14 via a power supply line 40. Therefore, when the bolt material 10 comes into contact with the stopper lever 14, the positive voltage V _B (see FIG. 3) from the DC power source 39 is applied to the bolt material 10. In this case, when the head contact sensor 32, each pressing piece 24, 25, and the shaft length detection sensor 33 do not contact the bolt material 10, the output signal line 37 to the material abnormality determiner 38... No output signal is input via 37.

FIG. 4 shows an overall circuit diagram of the defective material detection device 23 in this embodiment.

That is, the material abnormality detector 38 includes operating coils 41 of electromagnetic relays R ₁ , R ₂ , R ₃ , and R ₄ .
42, 43, and 44 are provided in parallel,
These four actuation coils 41, 42, 43, 4
4 includes the head contact sensor 32 and each pressing piece 2.
4, 25 and each output terminal 3 of the shaft length detection sensor 33
Output signal line 37...37 connected to 6...36
are connected to each other via manual open/close switches 45...45. In this embodiment, the on-off switches 45...45 are always closed. Therefore, among the head contact sensor 32, each of the pressing pieces 24 and 25, and the shaft length detection sensor 33, for example, the detection pin 31 of the head contact sensor 32 contacts the head 10b of the bolt material 10 and is turned on. Then, a signal current flows through the output signal line 37 connected to the head contact sensor 32, and the operating coil 41 of the electromagnetic relay _R1 becomes energized. Note that each of the other pressing pieces 24 and 25 or the shaft length detection sensor 33
Even in the ON state, the corresponding actuation coils 42, 43, and 44 are similarly energized.

A normally open contact 46 of an electromagnetic relay R ₁ and a normally open contact 47 of an electromagnetic relay R ₄ are connected in parallel to the power supply line 40 in the material abnormality determiner 38.
A normally open contact 48 of an electromagnetic relay _R2 is connected in series to the negative side of both normally open contacts 46, 47.
Furthermore, an electromagnetic relay is connected to the negative side of this normally open contact 48.
The normally open contact 49 of R ₃ and the actuating coil 50 of electromagnetic relay R ₀ are connected in series.

Further, a normally closed reset switch 51 is connected to the power supply line 40 in parallel to both normally open contacts 46 and 47 of the electromagnetic relays R ₁ and R ₄ . A normally open contact 5 for self-holding of the electromagnetic relay R ₀ is connected between the positive side and the + side of the operating coil 50 of the electromagnetic relay R ₀ .
2 have been established. And that electromagnetic relay
Another normally open contact 53 of R ₀ is opened, for example, between the alarm 54 and the above-mentioned power supply line 40 .

That is, according to the structure of the material abnormality determination device 38, when a normal bolt material 10 is supplied as shown in FIG.
5 comes into contact with the base shaft portion 10a and the small diameter shaft portion 10a' of the bolt material 10, respectively, and become in the ON state, and both operating coils 42 and 43 of the electromagnetic relays R ₂ and R ₃ become energized, making them normally open. Contacts 48, 49
are closed together, but the head contact sensor 3
The detection pin 31 of No. 2 is connected to the head 10b of the bolt material 10.
or the detection pin 35 of the shaft length detection sensor 33 does not contact the shaft portion 10a of the bolt material 10, the open state is maintained by the normally open contacts 46 and 47 of the electromagnetic relays R ₁ and R ₄ . Therefore, the operating coil 50 of the electromagnetic relay R ₀ is not energized. Therefore, the normally open contact 53 of the electromagnetic relay R ₀ for activating the alarm 54 remains open and the alarm 54 is not activated.

For example, in FIG. 2, as shown by the chain line, a bolt material 10 with a large outer diameter of the head 10b is used.
When supplied, the detection pin 31 of the head contact sensor 32 comes into contact with the head 10b of the bolt material 10, so that the operating coil 41 of the electromagnetic relay _R1 becomes energized. ,
The normally open contact 46 of the electromagnetic relay _R1 will be closed. Therefore, the operating coil 50 of the electromagnetic relay R ₀ includes the above-mentioned normally open contact 46 that is closed,
Power supply line 4 via normally open contact 48 and normally open contact 49
0 thereby causing the electromagnetic relay R ₀
The normally open contact 53 is opened and the alarm 54 is activated. At that time, since the normally open contact 52 for self-holding is also closed at the same time, the operating coil 5
0 is maintained in the energized state. Therefore, the bolt material 10 is pushed by the pusher lever 19 into the rolling space 6, and the pressing pieces 24, 25 and the head contact sensor 32 are turned OFF and connected to them. Electromagnetic relay R ₁ ,
Even if any of the normally open contacts 46, 48, 49 of R ₂ and R ₃ returns to the open state, the electromagnetic relay R ₀
By keeping the self-holding normally open contact 52 closed, the alarm 54 continues to operate. Thereby, it is reliably detected that the bolt material 10 with a defective shape has been supplied. Further, the alarm 54 is stopped by opening the reset switch 51.

In this embodiment, even if a bolt material 10 of a non-regular shape with a long overall length of the shaft portion 10a is supplied, the detection pin 35 of the shaft length detection sensor 33 comes into contact with the small diameter shaft portion 10a'. Then, the shaft length detection sensor 33 becomes ON, thereby closing the normally open contact 47 of the electromagnetic relay _R4 .
The operating coil 50 of the electromagnetic relay R ₀ is energized, the normally open contact 53 of the electromagnetic relay R ₀ is closed, and the alarm 54 is activated.

FIG. 5 shows a defective material detection device 2 according to this embodiment.
3 shows a second embodiment of the main circuit diagram of No. 3, and in this embodiment, the electromagnetic relays R ₁ , R ₂ ,
Each normally open contact 46, 48, 49 of _R3 is connected to the power supply line 40 in parallel with each other, and operates when the normally open contact 47 of electromagnetic relay _R4 and the normally open contact 47 are closed. An actuating coil 55 of the electromagnetic relay _R5 is connected to the power supply line 40 in parallel with each of the normally open contacts 46, 48, and 49.
The normally closed contacts 56 and 57 of the relay R ₅ are connected to the normally open contacts 48 and 49 of the relays R ₂ and R ₃ , respectively.
connected in series with. Furthermore, an operating coil 50 of the electromagnetic relay R ₀ is connected in series to one side of each of the normally open contacts 46, 48, 49 and the normally closed contacts 56, 57. Also in this case, a normally open contact 52 for self-holding of the electromagnetic relay _R is opened, and another normally open contact 53 of the electromagnetic relay R ₀ is opened between the power supply line 40 and the alarm 54. In this case, the detection pin 35 (see FIG. 2) in the shaft length detection sensor 33 is connected to each of the pressing pieces 24, 25.
It is assumed that the bolt is configured to contact the lower part of the small diameter shaft portion 10a' before contacting the base shaft portion 10a and the small diameter shaft portion 10a' of the bolt material 10 in the normal form. That is, in this circuit, before the contacts 48 and 49 of the electromagnetic relays R ₂ and R ₃ operate,
Contact 47 of electromagnetic relay _R4 is activated.

Therefore, according to this embodiment, when the detection pin 35 of the shaft length detection sensor 33 comes into contact with the small diameter shaft portion 10a' of the bolt material 10, the normally open contact 47 of the relay _R4 is closed. This will cause the relay to
The actuating coil 55 of _R5 is actuated, and the normally closed contacts 56 and 57 of the relay _R5 are opened. If the detection pin 35 does not contact the small diameter shaft portion 10a' of the bolt material 10, that is, the small diameter shaft portion 1
If the length of 0a' is shorter than the specified dimension, the relay
Each normally closed contact 56, 57 of _R5 does not open and the relay
The activation coil 50 of R ₀ will be activated and the alarm 54 will be activated. It goes without saying that the alarm is activated when the normally open contact 46 of the relay _R1 is closed, that is, even when the head 10b of the bolt material 10 has an abnormal shape. According to this, it is possible to reliably detect abnormalities in the head radius and axial length of the bolt material 10 as in the above embodiment, and to prevent mixing of the remaining bolt material 10 with a short axial length dimension used in the previous process. becomes possible.

Further, FIG. 6 shows a third embodiment of the main circuit of the defective material detection device according to this embodiment. In this embodiment, the normally open contact 48 of electromagnetic relay R ₂ and the _new The normally closed contact 58 provided in
The newly provided normally closed contact 59 of the electromagnetic relay R ₂ and the normally open contact 49 of the electromagnetic relay R ₃ are connected in series to the power supply line 40 . An electromagnetic relay is connected to the negative side of the normally open contact 49 and the normally closed contact 58.
Actuation coils 50 of R ₀ are connected in series.
Furthermore, immediately before the actuating coil 50, these contacts 4 are placed on the minus side of the normally open contact 49 and the normally closed contact 58.
A normally open contact 61 is connected in series and is actuated by a newly provided actuating coil 60 of the timer _T1 , which is connected in parallel with the timer T1. Also in this case, a normally open contact 52 for self-holding of the electromagnetic relay R ₀ is opened between the negative side of the reset switch 51 connected to the power supply line 40 and the positive side of the operating coil 50. At the same time, the electromagnetic relay
Another normally open contact 53 of R ₀ is opened between the power supply line 40 and the alarm 54 .

In this embodiment, the on/off switches 45, 45 provided on the output signal lines 37, 37 from the respective output terminals 36, 36 of the head contact sensor 32 and shaft length detection sensor 33 in FIG. It's open.

That is, according to this embodiment, either of the pressing pieces 24, 25 is separated from the base shaft portion 10a or the small diameter shaft portion 10a' of the bolt material 10, and this state is set in advance by the timer _T1. If it continues for more than the specified time, the timer
The normally open contact 61 is closed by the operating coil 60 of T ₁ , the operating coil 50 of the electromagnetic relay R ₀ is energized, and the alarm 54 is activated. In other words, the base portion 10 of the bolt material 10
The alarm 54 will issue an abnormality alarm regardless of whether the diameter of the shaft 10a or the small diameter shaft portion 10a' is larger or smaller than the normal value.

Note that instead of activating the alarm 54 when an abnormality is determined as shown in each of the above embodiments, the operation may be stopped, or the bolt material 10 discharged from the end side of the rolling space 6... 10 may be separated from the finished product stream for a predetermined period of time using a suitable sorting mechanism.

Further, as shown in FIG. 7, a bent part 11a is provided in the middle of the material supply chute 11, and the bolt material 10, whose movement toward the starting end of the rolling space 6 is temporarily stopped, is pressed at the bent part 11a. In order to transfer the material 10 to the starting end side of the rolling space 6, a pusher lever 19a driven by, for example, a hydraulic cylinder 62 is provided.
A pressing member 6 having the same configuration as the pressing pieces 24, 25, the head contact sensor 32, and the shaft length detection sensor 33 at the tip of the pressing member 9a.
3, and by energizing the pressing member 63 and the material supply chute 11 via the bolt material 10, the bolt material 10 is moved into the rolling space 6.
It becomes possible to reliably detect a bolt material 10 with a defective shape in the middle of the material supply chute 11 before being fed into the rolling space 6, and, for example, the bolt material with a defective shape is supplied into the rolling space 6. Before this, the bolt material 10 can be easily discharged from the supply chute 11, thereby preventing the bolt material 10 having a defective shape from being supplied into the rolling space 6. The rotating die 4 generated by the rotation and the fixed die 7 arranged opposite thereto
This makes it possible to prevent damage to the product.

(Effect of the invention) As described above, according to the first invention, each pressing piece forming a part of the material supply mechanism for pressing the rolling forming material (bolt material) into the rolling space. This makes it possible to reliably detect a material with a defective shaft shape before forming, prevent the defective material from being supplied into the rolling space, and prevent the defective material from entering the rolling space. It is possible to prevent damage to the rotating die and fixed die that would occur due to being supplied to the die, and also to reliably prevent defective products from being mixed into the finished product.

Further, according to the second invention, it is possible to detect an abnormality in the shape of the shaft of the material for rolling forming during the material supply chute, and thereby, before the defective material is fed to the starting end side of the rolling space. This means that processes such as removal during the material supply chute can be easily performed.

Furthermore, according to the third invention, it is possible to detect an abnormality in the shape of the shaft of the material for rolling forming, as in the first and second inventions, and to detect abnormalities in the shape of the head and the length of the shaft of the material. can also be detected reliably.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall plan view of a rotary screw rolling machine equipped with a defective material detection device according to the present embodiment, and Fig. 2 is a diagram showing the defective material detection device. 3 is a sectional view taken along the - line in FIG. 2, FIG. 4 is an overall circuit diagram of the defective material detection device in this embodiment, and FIGS. 5 and 6 are
The figures are main circuit diagrams of the second and third embodiments of the defective material detection device, respectively, and FIG. 7 is a plan view of the main parts showing an embodiment in which the defective material detection device of this embodiment is installed in the middle of the material supply chute. It is. 1... Rotary screw rolling machine, 3 ₁ , 3 ₂ ... Thread groove, 4... Rotating die, 6... Rolling space, 7...
Fixed die, 10... Material for rolling forming (bolt material), 11, 16... Material supply mechanism (material pressing mechanism, material supply chute), 14... Stopper member (stopper lever), 19, 19a... Pusher lever, 23... Defective material detection device, 24
...Base shaft part pressing piece, 25...Small diameter shaft part pressing piece, 3
2...Head detection piece (head contact sensor), 33...
Shaft length detection piece (shaft length detection sensor), 38...determination circuit (material abnormality determination device).

Claims (1)

[Claims for Utility Model Registration] (1) A circular rotating die with a large number of thread grooves formed on the outer circumferential surface, and a circular rotating die with a large number of thread grooves formed on the inner circumferential surface to connect the rotary die to a predetermined rolling space. arc-shaped fixed dies arranged opposite to each other, a material supply chute that supplies a material for rolling forming previously formed into a predetermined shape toward the starting end side of the rolling space; A stopper member contacts the rolling material supplied to the starting end side of the die to prevent the material from entering the rolling space; A defective material detection device for a rotary screw thread rolling machine, comprising a material supply mechanism having a pusher lever for pushing into the rolling space from the side, the device being provided at the tip of the pusher lever to detect the material for rolling by the pusher lever. a base pressing piece that contacts the base of the material when the material is pressed and is electrically connected to the stopper member through the material; and a base pressing piece that is provided at the tip of the pusher lever for rolling forming by the pusher lever. A small-diameter shaft pressing piece that contacts the small-diameter shaft portion having a smaller diameter than the base shaft portion of the material and has a thread groove formed thereon when pushing the material, and is energized between the material and the stopper member; , a rotary screw rolling machine comprising: a determination circuit that detects an abnormality in the shape of the shaft of the rolling material when at least one of the pressing pieces is de-energized; Defective material detection device. (2) A circular rotary die with a large number of thread grooves formed on its outer circumferential surface, and a circle with a large number of thread grooves formed on its inner circumferential surface facing the rotary die with a predetermined rolling space in between. an arc-shaped fixed die; a material supply chute that supplies a material for rolling forming formed into a predetermined shape toward the starting end of the rolling space; A stopper member that contacts the material for forming and restricts the entry of the material into the rolling space; A defective material detection device for a rotary screw thread rolling machine, which is equipped with a material supply mechanism having a pusher lever for pushing the material into the material supply chute, and is provided in the middle of the material supply chute and moves on the chute toward the rolling space. A pusher lever that presses the forming material to change the direction of movement of the material, and the material supply chute provided at the tip of the pusher lever and in contact with the base shaft of the rolling forming material via the material. The base shaft part pressing piece which is energized at the time of contact with the small diameter shaft part provided at the tip of the pusher lever and having a diameter smaller than that of the base shaft part of the material for rolling forming and in which a thread groove is formed, through the material. detecting an abnormality in the shape of the shaft of the material for rolling forming when at least one of the small-diameter shaft pressing pieces is in a energized state between the material supply chute and each of the pressing pieces is de-energized; What is claimed is: 1. A defective material detection device for a rotary screw rolling machine, comprising: a determination circuit for detecting defective material in a rotary screw rolling machine. (3) a base pressing piece that is provided at the tip of the pusher lever and is in contact with the base of the material for rolling forming and is electrically connected to the stopper member or the material supply chute via the material; and the pusher lever. is provided at the tip of the material for rolling forming, and is in contact with a small-diameter shaft portion having a smaller diameter than the base shaft portion of the material for rolling forming and in which a thread groove is formed, and is connected to the stopper member or the material supply chute through the material in an energized state. a small-diameter shaft pressing piece, which is provided at the tip of the pusher lever so as to face the head of the material for rolling forming, and is in contact with or in a non-contact state with the material when the pusher lever presses the material for rolling forming. and a head detection piece that is energized or de-energized between the stopper member or the material supply chute via the material, and a shaft from the shaft end of the rolling forming material to the tip of the pusher lever. When the pusher lever presses the material for rolling forming, it is in contact with the material or in a non-contact state, and is energized between the material and the stopper member or the material supply chute through the material. Alternatively, it includes an axial length detection piece that is in a non-energized state, and a determination circuit that detects an abnormality in the shape of the rolling forming material when at least one of the pressing pieces and each detection piece is in a non-energized state. A defective material detection device for a rotary screw rolling machine according to any one of claims 1 (G) and 2 (G) of the utility model registration, characterized in that: