JPH0451007Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field of the invention) This invention is a multi-stage forming machine that forges metal products such as bolts and nuts by forging metal materials in stages using a punch and a corresponding die. This invention relates to a device that can automatically inspect for cracks, breaks, and other flaws during the continuous process using the final forging process.

(Description of prior art) A device that uses a multi-stage forging machine and has an inspection mechanism installed in a continuous process to inspect for cracks, breakage, and other flaws in a forged product that occurs during forging is disclosed in Japanese Patent Laid-Open No. 56
This has been proposed by the inventors of the present invention as seen in Japanese Patent No. 148436. A known device utilizes one of several heading stages as an inspection mechanism, but
The material to be inspected is loaded into the die base so as to be upset on the die side and rotated, and the head of the material protruding forward is brought close to the inspection device to detect the presence or absence of flaws. In such conventional equipment, the die side must be significantly modified and the rotation mechanism, its transmission mechanism, and material holding mechanism must be built into the long main body frame so as to pass through it in the front and back direction, making the equipment extremely difficult. In addition to being large-scale, the materials to be inspected are limited to bolts and rivets that have a head integrally attached to one end of the shaft, and since it is only possible to set the shaft diameter to a certain value, The drawback was that it was not possible to extensively inspect a wide variety of pressed products with different diameters.

(Purpose of the invention) The present invention addresses these conventional drawbacks, and its first purpose is to mount a simple device on the front of the die base using almost the same mechanism on the die side. The purpose of the present invention is to provide a flaw inspection device for a forging machine that can accurately inspect for flaws on products forged in the previous stage simply by attaching it to the machine. An object of the present invention is to provide a flaw inspection device in a home machine capable of continuously and fully automatically inspecting a wide variety of forged products including hollow cylindrical products. A third object of the present invention is to provide an apparatus of this type that can be used to handle pressed molded products of different shapes and sizes by replacing the holder for the inspection object flap.

(Structure of the device) In order to achieve the above object, the flaw inspection device for a holer according to the present invention sequentially processes a metal material in a forging unit consisting of a plurality of punches arranged in a horizontal row and dies located opposite each of the punches. A flaw inspection in a forging machine consisting of a device that performs stepwise forging to produce a forged product with a circumferential surface, and a device that inspects the forged product (inspection object) for the presence of flaws in the final process. The device includes a rotary body 6 supported to rotate in conjunction with the operation of the movable ram 2 at the final die position of the forging section, and a rotary body 6 that is removably attached to the axial center of the rotary body from the front. This consists of a split cylinder that rotates integrally, and the inspected object that has been forged in the previous process is clamped by forced pushing so that it is fitted into the split cylinder in an internal or external fitting manner. A holder 9 for clamping an inspection object, a flaw inspection device 13 that inspects the presence or absence of flaws using a contactor or electric signal disposed at a position facing the circumferential surface of the clamped inspection object, and a corresponding movable ram side. and a pressing body 3' that moves together with other punches and operates to push the object to be inspected into the holder 9 for clamping the object to be inspected and hold it in a fixed position when the punch moves forward.

It is preferable that the flaw inspection device 13 is provided on a movable table 14 whose movement can be adjusted relative to the inspection object clamp holder 9.

Further, a knockout pin 20 can also be provided on the rotating body 6.

(Example) FIG. 1 shows a multi-stage former in which the device of the present invention is implemented. In the figure, 1 is a frame body, 2 is a movable ram that is reciprocated within the frame, and the rotation of the main shaft is transmitted via a crank mechanism (both not shown).

Reference numeral 3 denotes punches arranged at predetermined intervals at the tip of the movable ram 2, and a die 5 is provided on a die base 4 on the corresponding fixed side. In the illustrated example, the punch 3 and the die 5 are arranged in four stages, and the flaw inspection device A, which is the object of the present invention, is installed in the fifth stage.

2-3 and 4-5 show enlarged views of this apparatus A.

The rotating body 6 is a mounting base 7 fitted in the die base 4.
The test object clamp holder 9 is rotatably mounted on a bearing 8, and a screw hole 6a is provided in the shaft center, and a mounting screw 9a of the inspection object clamp holder 9 is screwed into the screw hole 6a to be integrally attached. This holder 9 is formed into a tapered conical split cylinder shape in FIGS. 2 and 3, and the test object 10 is forcefully fitted onto the outer circumference of the holder 9, and the holder 9 is formed into a split cylinder shape as shown in FIGS. so that it fits inside the middle part of the section.

The rotating body 6 has a gear 6b integrally formed at its tip, which is engaged with a rack 11 on the front surface of the mounting base 7, and is rotated by the vertical movement of the rack 11.

The crack 11 is attached to a slider 12 that moves up and down in conjunction with a crank mechanism (not shown), so that the rotating body 6 rotates at least one rotation during one movement of the moving ram 2.

The flaw inspection device 13 is provided on the die base 4 so as to correspond to the circumferential surface of the object to be inspected 10, but it can be moved near and far so that it can be moved away from a nearby position when supplying the object to be inspected. Attaching to the movable base 14 Figures 2 and 3 show the case where the movable base 14 is operated by the cam 15, and Figures 4 and 5 show the case where the movable base 14 is operated by the cam 15.
A case is shown in which the air cylinder 16 is operated.

In the case of using the cam 15, the camshaft 23 is periodically driven in conjunction with a driving device such as the moving ram 2. When the cam 15 rotates, the lever 25, whose intermediate portion is supported by the shaft 24, resists the spring 26 and the cam portion 15a
The movable table 14, which is connected to the tip with a pin 27, is pulled up each time by pressing down every rotation.

The dust remover 28 is a brush, an air injection nozzle, or the like, and is movable up and down by an air cylinder 29 to remove dust, metal powder, etc. attached to the object to be inspected.

Generally, the flaw detector 13 detects the presence or absence of flaws electrically using an optical sensor, or mechanically by bringing a probe like a needle into contact with the flaw. In some cases, a combination of a probe 17 and an optical sensor 18 is used.

The object to be inspected 10 inspected by the device of the present invention is
In addition to nuts with flanges (Fig. 6) and retainers used as spring holders (Fig. 7e), all kinds of pressed metal products having a circumferential surface such as cylindrical bodies and flange bodies are applicable.

(Operations and Effects) A metal material is sequentially forged in stages in a forging section consisting of several sets of punches 3, 3... and dies 5, 5... provided in a horizontal row, for example, as shown in Fig. 7 a, b, c, d
After that, the pressed molded product (tested object 1) as shown in the figure e is
0) is formed in the final section of forging, it is supplied to the inspection device A of the present invention by a transfer chuck (not shown), and is forced into the clamp holder 9 by the pressing body 3' when the ram 2 moves forward. Fit and hold by press-fitting. When the movable ram 2 retreats, the rack 11 moves up and down in conjunction with the crank mechanism, so the rotary table 6 rotates via the gear 6b meshed with the rack 11, rotating the holder 9, and therefore the object to be inspected 10, one rotation or more. let

If there is a flaw S on the object 10 to be inspected, check the presence of the flaw, the depth and size of the flaw, etc. using the flaw detector 1 during one rotation.
Detect with 3.

When the flaw S is detected by the feeler 17 in Fig. 2, the support shaft 1
9 as a fulcrum, the distance L to the sensor 18 changes, which is electrically converted.

When the object 10 to be inspected is supplied to the apparatus A, the flaw detector 13 is located close to the flaw detector 13 and gets in the way, so the cam 15 or the air cylinder 16 is activated to pull the entire flaw detector upward. Once set, immediately fix it in its original position.

When the series of inspections is completed, the blank is pushed out from the other die hole when the pressing body 3' retreats, and at the same time the knockout pin 20 installed on the rotating body 6 is pressed out.
protrudes, the object to be inspected 10 is pushed out from the clamp holder 9, and is recovered to a predetermined location via the chute 21.

As mentioned above, the present invention continuously and automatically inspects the head of a forged product by feeding the forged product in the forging section of a multi-stage former to the flaw inspection device installed at the end of the forging section so as to protrude from the front of the die base. It is possible to inspect products with circumferential surfaces such as parts and flanges for flaws, and the object to be inspected is force-fitted into a removable clamp holder made of a split cylinder, either externally or internally. Therefore, any molded product can be inspected for flaws, regardless of its shape or size, as long as it has a circumferential surface, such as a flange nut, cylindrical product, or other flanged product. Further, by simply incorporating a simple mechanism such as a rotating body and a holder into the front part of the die base, the operation and handling are simple and can be carried out at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a plan view of a multi-stage former equipped with the present invention, Fig. 2 is an enlarged front view of the flaw inspection device of the present invention, and Fig. 3 is Fig. 2
4 is a front view of the second embodiment of the device of the present invention, FIG. 5 is a longitudinal sectional side view of the same, and FIG.
The figure is a side view of a flange nut as an object to be inspected.
Figures 7a, b, c, d, and e are examples of molded products showing the forging process in the forging section, and the right half of each is shown in cross section. 3...Punch, 4...Die base, 5...Dice, 6...Rotating body, 9...Clamp holder, 1
0...Object to be inspected, 11...Rack, 3'...Press body, 13...Flaw inspection device, 14...Moving table, 20...
...Knockout pin, 28...Dust remover.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Forging with a circumferential surface by sequentially forging a metal material in a forging section consisting of a plurality of punches arranged horizontally in a row and dies positioned opposite each of the punches. A flaw inspection device in a forging machine comprising a device for forming a molded product and a device for inspecting the forged molded product (inspection object) for the presence or absence of flaws in the final process, A rotary body 6 is supported at a position so as to rotate in conjunction with the movement of the moving ram 2, and a split cylinder is detachably attached to the axis of the rotary body from the front and rotates integrally with the rotary body 6. A holder 9 for clamping an inspection object, which clamps the inspection object that has been forged in the previous process by forced pushing so that it is fitted into the split cylinder in an internal or external fitting manner.
, a flaw detector 13 that inspects the presence or absence of flaws using a contactor or electric signal placed at a position facing the circumferential surface of the clamped object to be inspected, and a flaw detector 13 that moves to the corresponding movable ram side together with other punches. A flaw inspection device in a home machine, characterized in that a pressing member 3' operates to push an object to be inspected into a holder 9 for clamping the inspection object and hold it in a fixed position when the object to be inspected moves forward. (2) The flaw inspection device in a home machine according to claim 1, wherein the flaw inspection device 13 is provided on a movable table 14 that can be moved and adjusted relative to the holder 9 for clamping the inspection object. (3) The flaw inspection device for a home machine according to claim 1 of the utility model registration, wherein the rotating body 6 is provided with a knockout pin 20.