JPS6186042A - Forging machine - Google Patents

Abstract

PURPOSE:To obtain a titled forging machine for forming a formed part of a high quality which is free from a surface damage, by fitting and inserting a push-holder for holding a burr part of the formed part of a die front end part, into the outside periphery of a punch so that it can be energized and slit, holding exactly the burr part at the time of driving of the punch, and preventing its scattering. CONSTITUTION:A push-holder 8 for holding a burr part of a formed part overhung to a die 4 front end holding hole 24 is attached to the outside periphery of a head 14 of a punch 5, b6 energizing slidably it with a spring. At the time of driving of the punch 5, first a cylindrical body 11 holding surface 15 of the tip of the holder 8 holds exactly the burr part of the formed part and prevents its scattering, and as the punch 5 moves backward, the burr part is omitted and removed. Accordingly a surface damage of the formed part by the scattering or a lapped burr is prevented, and its quality is raised.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a forging machine, more specifically a forging machine equipped with a die and a punch, in which the punch section is improved and the beam of the molded product that is generated when the punch is driven into the die is prevented from scattering. This invention relates to a forging machine that can prevent this.

When a conventional forging machine drives a punch into a die.

Since there is nothing to hold down the beam of the molded product held by the die, the punched burrs scatter outward from the periphery of the punch during driving. This is particularly noticeable, and as a result, the newly scattered particles are held by the claw member and transported to the front of the die, and then rush into the gap between the molded product to be punched next and the punch, and the molded product before being punched. There were drawbacks such as damaging the display of the product.

It is an object of the present invention to eliminate the drawbacks of the conventional method and to prevent the burrs of the molded product from scattering when the punch is driven into the die.

The purpose of the present invention is to slidably fit a burr holder having a holder on the front end of the die side to the outer periphery of the punch to press the burr of the molded product, and to press the burr holder before driving the bon-F'' into the die. The holder is held so that the pressing surface is located near the front end surface of the punch, and when the punch is driven into the die, the pressing surface is located behind the front end surface of the punch and presses the burr of the molded product. This is achieved by providing a forging machine that is provided with a biasing member that biases the front end of the punch.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1A and 18 show the beam part 2 punched out by a forging machine.
This shows a molded product l that has a plurality of (4 pieces) and becomes a spider after punching.

Figure 2.3.4 shows the die 4 and punch 5 equipped on the forging machine of this invention. The front part of the bond 5 on the die 4 side is formed into a small diameter part 6 by an annular stepped part, and on the outer circumferential surface of the front end of the small diameter part, four protrusions 7 are arranged at equal intervals Kf in the circumferential direction.
The protrusion 7 is curved so that when the punch 5 is driven into the die 4, the protrusion 7 comes into contact with a portion of the molded product l excluding the beam portion 2. 8 is a KV that can be slid on the outer circumference of Bontero.
A holder for a beam presser is inserted, and the holder consists of two cylindrical bodies 10, 11 having different inner diameters connected by a bolt 9. An annular engaging step portion 12 is formed on the joint inner surface of the cylinder body 10.11, and a protrusion s14 having a size to fill the gap between the protrusions 7 is formed on the inner surface of the front end of the cylinder body 11.
is provided, and the front end surface of this protrusion 14 facing the die 4 is formed as a presser surface 15.

A sleeve 16 is fitted and fixed on the rear outer periphery of the punch 5,
A coil spring 17 that biases the holder 8 toward the front end S of the punch 5 is interposed between the sleeve 16 and the cylindrical body IO. Reference numeral 18 denotes a stopper fixed to the outer circumferential surface of the small diameter portion 6, and the stopper 18 is adapted to engage with the stopper 12 of the holder 8, which is biased by the coil spring 17. The presser surface 15 is pressed before driving into the die 4.
is positioned so that it is slightly set back from the front end surface of the protrusion 7. Further, 20 is a key fixed to a key groove formed on the outer circumferential surface of the punch 5, and this key 20 has a key groove formed on the inner circumferential surface of the sleeve 16 and a key groove formed on the inner circumferential surface of the holder 8. (Neither keyway is shown)
is slid into place. As a result, the holder 8 is non-rotatably guided by the key 20 during sliding.

On the other hand, a concave hole z3 having an approximately cross-shaped cross section is formed in the die 4, into which the punch 5 including the protrusion 7 is driven.
A molded product holding hole z4 is formed in the front edge of the molded product 3, in which the molded product l is held by engaging the beam portion 2 with the bottom surface thereof.

Next, the operation of the above embodiment will be explained.

From the state shown in Fig. 2, the punch 5 is
When the bonder 5 is driven into the die 4, the bonder 5 is attached to the front end surface of the protrusion 7, and the part K of the molded product l, excluding the beam 2, which was previously carried by the claw member and held in the holding hole 24 before the punch 5 was driven. First, it moves forward and comes into contact with it, and then it moves further into the recessed hole 23 against the coil spring l'7 and punches out the burr 2 from the molded product l. During this driving, the burr part 2 is bonded to the bonder 5.
At the same time, since the punched beam 2' is held down by the holding surface 15 formed on the protrusion 14 of the holder 8 that enters the holding hole 24, the punched beam 2' does not scatter (see FIG. 5). When the punching is finished, the punch 5 retreats from the die 4 and returns to the original standby position shown in FIG. However, the presser surface 15 assumes a position slightly retracted from the front end surface of the protrusion 7. Therefore, the punching beam 2', which was in the holding hole 24 and was held down by the holding surface 15 of the holder B, is removed from the holding hole 24 of the punch 5.
When the die 4 retreats from the holding hole 24, it falls below the front surface of the die 4. Further, the product 1' (spider) pushed into the recessed hole 23 by the punch 5 is pushed out toward the holding hole side by an operating member (not shown) that enters from the side opposite to the holding hole 24 of the recessed hole 23, and is pushed out to the holding hole side in the same way as the beam 2'. It then falls below the front of the dice 4 and is collected.

As described above, each time the bonder 5 is driven into the die 4, the beam part 2 of the molded product l is reliably pressed by the pressing surface 1sic of the holder 8 which is slidably fitted on the outer periphery of the punch 5. It would be impossible for the pulled beam 2' to scatter.

In the above embodiment, four pressing surfaces 15 are formed corresponding to the number of burrs 2 of the molded product l, but the number is not limited and can be designed as appropriate depending on the number of burrs 2. There are only 15 things that can be changed.

The present invention is as described above, in which a burr presser holder having a presser surface for pressing a beam of a molded product is slidably fitted onto the outer periphery of the punch, and before driving the punch into the die. K means that the holding surface is located near the front end surface of the punch, and when the punch is driven into the die, K holds the holder so that the holding surface is behind the front end surface of the punch and presses the burr of the molded product. Since a biasing member is provided on the front end side of the punch, the beam of the molded product can be reliably pressed by the holding surface during driving, and the punched burr can be prevented from flying away. Therefore, there is no damage to the catfish surface of the molded product to be punched next as in the conventional method, and there are excellent effects such as being able to supply a high quality product.

[Brief explanation of drawings]

Figure 1A is a front view of the molded product, Figure 1B is a plan view of the same as above,
Fig. 2 is a longitudinal sectional front view showing an embodiment of the die and punch installed in the forging machine of the present invention, Fig. 3 is a sectional view taken along line I-■ in Fig. 2, and Fig. 4 is M2 Fig. IV-IV. FIG. 5 is a sectional view of the five-line crushing die, and is an explanatory view corresponding to FIG. 2 with the lower half omitted. l... Molded product 2... Ri part 4...
Dice 5... Chiro...
・Small diameter part 7...Protrusion 8...Holder 9...Route 10.11...Cylindrical body
14-1 Tsutsu 15...presser side 16...
・Sleeve 17...Coil spring 18...Stock collar 20...Key 23...Concave hole 24・
・・Retaining hole

Claims (1)

[Claims] 1. In a forging machine equipped with a die and a punch, a burr presser holder having a presser surface for pressing the burr of the molded product at the front end on the die side is slidably inserted into the outer periphery of the punch,
Before the punch is driven into the die, the pressing surface is located near the front end surface of the punch, and when the punch is driven into the die, the pressing surface is located behind the front end surface of the punch and presses the burr portion of the molded product. A forging machine characterized in that a biasing member is provided for biasing the holder toward the front end of the punch.