JPH0646587Y2 - Houma with free upset die structure - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention utilizes a multi-stage homer for manufacturing a forged product by sequentially forging a metal material from a coarse to a fine with a punch and a corresponding die. The present invention relates to a free upset die structure in a homer capable of manufacturing a front blank in a vertical press.

(Prior Art) A die for a front blank in a vertical press has a die 1 fixed horizontally on a lower die stand as shown in FIG. 1, and a punch 2 is attached to a vertically moving ram 4 to move it vertically. Face and punch 2
The flat disc-shaped blank 3 is forged in one step by applying compressive force to the upper and lower ends of the cutting blank between the die 1 and the die 1 which are horizontally placed.

(Problems to be solved by the invention) An advantage of manufacturing a front blank in such a vertical press is that one size of die can be used to process free size blanks with different forging diameters in order to prevent the outer circumference of the material from being bundled. It is in. However, in order to manufacture the front blank in this vertical press, a cutting machine and two precompressing presses are required, and there is a problem that the work is inefficient.

The present invention has been made in view of the above problems of the conventional technology, and its purpose is to use a die for a front blank in a vertical press in a horizontal press (homer) to provide a multi-stage press. It is an object of the present invention to provide an apparatus capable of continuously performing several steps from cutting of a material to forging of a front blank to subsequent forging, as a forging machine.

(Means for Solving the Problems) In order to achieve the above object, a homer equipped with a free upset die structure according to the present invention comprises a cutting device 10 for cutting a material into a certain length, and a punch for cutting a cut blank. In a homer equipped with a forging part 30 forging with a die, at least one die attachment part of the forging part is provided with a free upset die 12 that does not bind the blank outer periphery when punching, and this free upset die 12 A blank holding chuck 15 is provided for opening and closing so as to receive the blank pressed on the tip end face by forced press-fitting and hold it at the center position.
Is a structure in which a plurality of chuck claws 16 are provided at equal intervals on the circumference so as to move far and near toward the center of the tip surface of the free upset die 12, and a spring 17 is biased toward each chuck claw 16 in the closing direction. is there.

In addition, each of the chuck claws 16 of the blank holding chuck 15 provided in the free upset die 12 has a lead surface 16 formed of a tapered surface so as to guide the press-fitting when the blank is pushed.
a is provided.

A knockout pin 18 is provided on the free upset die 12.

(Operation) The cutting blank a obtained by the cutting device 10 is gripped by the transfer chuck 11 and is pressed by the free upset die of the first stage of forging.
The cutting blank a is conveyed to a position immediately before 12, where the punch 13 is advanced together with the ram 14 to push the cutting blank a. By this pushing, the blank a hits the front end surface of the die 12 as shown in FIG. 3, and at that time, the claws 16 of the chuck 15 are forcibly spread and held between the chuck claws 16 under pressure. When the punch 13 is pushed to the front dead center and a pressing force is applied to the blank a, the blank is pressed flatly into a disk shape as shown in FIG. It Due to this diameter expansion, the chuck claw 16 is pushed outward against the bias of the spring 17, but the spring pressure acts more strongly, so that even if the punch 13 moves backward, the flat forged blank a'can be pushed from above, below, left and right. Since it is strongly held by the chuck claw 16, it does not fall downward.

The forged blank a ′ is then once taken out of the system and collected in the parts feeder 20. From this, the forged blank a ′ as shown in FIG. 6 is obtained by undergoing the second and third forging processes. Complete.

In some cases, it is directly supplied to the next forging step without being taken out of the system.

(Example) An example will be described with reference to the drawings.

Fig. 7 shows the free upset die structure incorporated in the first stage of forging of a multi-stage homer, the second stage being used as the feeding device 21 after the blank obtained in the first stage was taken out of the system, and the third stage. Is used for the forging finishing process, but it may be directly transferred to the next forging process.

The cutting device 10 includes a quill 10a and a moving knife 10b,
A moving knife traverses the tip opening of the quill 10a and cuts the material protruding through the quill to the tip opening to a certain size.

The transfer chuck 11 is provided between each process,
The blank a obtained in the cutting step is carried to the first stage and transferred from the first stage to the second stage and the third stage, which is unique to Homer.

The free upset die 12 is exposed at the end surface of the die case 27 so that the front end surface 12a is vertical, the knockout pin 18 is inserted in the center portion, and the blank a after forging is operated to be pushed out from the chuck claw 16.

The blank-holding chuck 15 is composed of a swingable chuck arm 15a having a rear end portion pivotally supported by a pivot shaft 19, and a chuck claw 16 and a spring 17 fixed to a tip end of the chuck arm 15a with a set screw 22.

A stopper 23 is provided on the chuck arm 15a to regulate the opening of the chuck claw. The stopper 23 consists of a bolt screw and can be adjusted by screwing.

Such a chuck 15 has a chuck arm which is formed on the outer peripheral surface of the die case 27 in the longitudinal grooves 24 formed in the axial direction at equal intervals on the circumference.
It is formed by incorporating 15a.

The illustrated example has three arms, but the number of arms is not limited to three.

A lead surface 16a formed of a tapered surface is formed at the tip of the chuck claw 16 so as to smoothly open and guide the press-fitting when the blank 13 is pressed by the punch 13.

(Effect of the Invention) Since the present invention is configured as described above, it has the following effects.

It is possible to easily and surely perform a series of steps from cutting of a free-size blank having different forging diameters by one type of die with a horizontal type homer to post-press finishing without binding the outer periphery of the material.

When the blank is pressed against the tip of the free upset die, it is press-fitted so that it is gripped by the chuck claws so that it can be accurately forged, and there is a concern that it will fall off the die tip surface even when the punch retracts. Therefore, the subsequent steps can be carried out smoothly and surely.

It can be implemented easily and inexpensively by using the existing multi-stage homer, and the cost can be reduced and the implementation is easy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a forged portion formed by a conventional vertical press, and FIG.
FIG. 4 is an enlarged front view of a free upset die structure portion according to the present invention, FIG. 3 is a longitudinal side view of the same, FIG. 4 is an enlarged plan view of a chuck mounting portion, FIG. 5 is an operation explanatory view of a blank forging portion, and FIG. FIG. 6 is a cross-sectional view showing an example of a press-formed product, and FIG. 7 is a plan view when the present invention is applied to a multistage homer. 10 ... Cutting device, 12 ... Free upset die 13 ... Punch, 14 ... Ram 15 ... Holding chuck, 16 ... Chuck claw 17 ... Spring, 18 ... Knockout pin 19 ... Spindle, 20 ... Parts feeder aa′.a ″… blank

Claims (3)

[Scope of utility model registration request] 1. A cutting device 10 for cutting a material into a certain length,
A forging section that forges a cut blank with a punch and a die.
In the homer equipped with 30, a free upset die 12 that does not bind the blank outer periphery at the time of punching is provided on at least one die attachment part of the forging part, and the free upset die 12 is pressed on its tip surface. A blank holding chuck 15 that opens and closes so as to receive the blank by forced press and hold it at the center position is provided.
The blank-holding chuck 15 is provided with a plurality of chuck claws 16 at equal intervals around the circumference so as to move far and near toward the center of the tip surface of the free upset die 12.
A homer having a free upset die structure characterized in that a spring 17 is biased in the closing direction. 2. A lead surface 16a formed of a tapered surface is provided on each chuck claw 16 of a blank holding chuck 15 provided on the free upset die 12 so as to guide press-fitting when a blank is pushed. A homer having the free upset die structure according to Item 1. 3. A homer having a free upset die structure according to claim 1, wherein said free upset die 12 is provided with a knockout pin 18.