JPS6254541A - Knockout device for metallic mold - Google Patents

Abstract

PURPOSE:To divide a restraint to a work into a base part and a head part, and to execute easily the knockout by separating a projecting part of a part of a lower die forming surface into a base part and a head part, inserting a knockout pin through the base part, and attaching the head part to the tip. CONSTITUTION:After a forming work or a casting work has been executed, when a knockout pin 11 is pushed up together with a head part 9, a work A is brought to knockout. In this case, a projecting part for forming a part of a forming surface of a lower die is fitted into a recessed part of the work A, but since the projecting part 7 is divided into a base part 8 and the head part 9, a force required for separating the work A from the projecting part 7 is reduced by the quantity corresponding to height l' of the head part 9, it can be separated easily from the lower die. Also, since the work 7 is coupled with only the head part 9, it can be separated by a small external force.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a knockout device used for ejecting a workpiece from a metal mold for press forging, die casting, etc.

(Prior art) As shown in Fig. 3, a conventional knockout device for a lower die has a rod-shaped knock aral pin (1) inserted into a hole provided in the lower die.
was slidably inserted through the bin, and the work indicated by A was pushed out by the end face (41) of the bin [phase].

(Problem to be solved by the invention) In the conventional knockout device, the knockout pin (a)
Fine powder of metal scale may fall between the hole Extrusion was sometimes difficult because the restraining force of the part on the workpiece A was large.

(Means for Solving the Problems) The present invention solves the above-mentioned problems using extremely simple means. , a knockout pin is slidably inserted into the base, and the head is attached to the tip of the knockout pin.

(Function) After the molding or casting work, the knockout pin (+1
) is pushed up together with the head (9), the workpiece A is knocked out. The protrusion (7) of the lower mold is located at the base (8) and the head (9).
), the restraining force on the workpiece is partially distributed during knockout, making it easy to knock out the workpiece.

(Example) Figures 1 and 2 show the present invention applied to a mold for performing hot bending and finish forming on the knuckle (workpiece) of a front wheel of an automobile. , lower mold body (2)
It has a movable mold (4) that moves up and down in a space (3) in the main body (2), and an arm stand (5) fixed on the main body (2).

The movable type (4) includes an outer cylinder (6) and a positioning core (7) that is attached to the inside of the outer cylinder to form a protrusion, and the core (7) is divided into upper and lower parts and has a base ( 8) and head (9
). A pin at is inserted into the hole (+1) of the base (8) so as to be freely drivable, and the protrusion a3 of the head (9) fits into the hole (+21) on the end face of the pin, and is fixed with a bolt aΦ. The mold (4) has a movable plate I'IQ fixed to its lower surface with bolts qS and is driven up and down by a hydraulic cylinder (17).

ae is a slide balancer, the large diameter part a9 of which fits into the guide hole ■ of the lower die main body (2), and the small diameter part
It fits into the guide hole. Then, J: is attached to these fitting parts to prevent the inclination of the different type (4) and also to prevent the large diameter part (
+! ! The spring supporting the lower end of the mold is designed to reduce the impact received from the upper mold. ■ is knockara 1~
In the bottle, the knockout pin (11) together with the knockout plate is operated by the extrusion rod {circle over (1)}.

The upper die ω consists of an upper die body ■ and a bending cam ■, and a knockout pin ■tyD4 is provided passing through the body ■, and these pins are operated by a knocker 1 to a plate ■ and an extrusion rod ■.

Next, the function of this mold will be explained. Raise the upper mold (1), operate the hydraulic cylinder (17) to raise the movable plate (lG) to the upper end of the space (3), and move the movable mold (4) onto the arm stand (
5), sandwich the center boss part of the straight knuckle A heated to about 800℃ between the movable mold (4) and the protruding part ■ of the upper mold, and then press the upper mold (1) and the moving vJ mold. (4), the arm A' of knuckle A is received by the arm stand (5).
Because of this, the knuckle is bent into the shape shown in the figure at the lowest positions of the upper mold (1) and the movable mold (4), and the entire knuckle is subjected to a finishing molding action according to the shape of the mold.

After molding, the upper and lower molds are separated, and the knuckle A is removed from the mold by operating the knocker 1-bin an c2c co Q/D. The positioning core (1), which is a protruding part forming a part of the molding part of this sharpening mold (1), is fitted into the recess into the knuckle over a length l, but the core (7) is located at the base. (8) and the head (9), the force required to separate the knuckle A from the core (7) is reduced by an amount corresponding to the height a' of the head (9).
Separation from the lower mold becomes easy. After separating the knuckle A from the upper and lower molds, the knuckle 4A is connected only to the head (9), so it can be easily separated from there by applying a small external force.

Furthermore, the head (9) acts as a cover for the hole aO of the base (8), and prevents fine powder of metal scale generated by the molding process from entering the gap between the hole (IQI and the pin C11). The movement of the pin (It) is not inhibited by the powder.

On the other hand, in the conventional type in which the knock ringer 1 to the pin (A) shown in Fig. 3 are simply inserted into the hole (G) in the core, fine powder easily enters the gap, and in addition, the knuckle A and the core are easily inserted into the gap. It has the disadvantage that it is difficult to knock out due to the long fitting length Q with ω.

(Effects of the Invention) Since fine powder of metal scale does not fall into the hole through which the knockout pin is inserted, the movement of the knockout pin is not obstructed. Furthermore, since the large protruding portion is divided into two parts, the base and the head, the restraining force on the workpiece is also divided into two parts during knockout, making it easier to separate the workpiece.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a hot bending mold equipped with the knockout device of the present invention, and Fig. 2 is a longitudinal sectional view of the main parts of the present invention.
FIG. 3 is a longitudinal sectional view of a conventional device. (7)...Protruding part (8)...Base (9)...
・Head (+11... Knockout pin patent application person) Tree E11 Giken Kogyo Co., Ltd. Figure 1 I737

Claims (1)

[Claims] The head is separated from the base of the protruding part forming part of the molding surface of the lower mold, a knockout pin is slidably inserted into the base, and the head is attached to the tip of the knockout pin. Mold knockout device.