JPH072116Y2 - Mold fixing device for forging machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention fixes a die (tool) such as a punch or a die in a header or a transfer home for forming bolts and nuts by forging at a predetermined mounting position. Regarding the device.

[Prior art]

A forging machine such as a bolt home is equipped with a die A and a punch B in front of a machine base 1 and in front of a ram 2 that moves back and forth with respect to the front of the machine base, as shown in FIG. 1, for example. Such dies and punches are disclosed in, for example, Japanese Examined Patent Publication No. 53-5933, No. 52-22817, or No.
As disclosed in Japanese Patent Laid-Open No. 5-1700, etc., all of them are removably fitted in a holder and fixed by bolts for tightening.

[Problems to be solved by the invention]

By the way, dies such as dies and punches are often worn out or must be replaced depending on the purpose and type of processing, but these dies were fixed with bolts as in the previous term. In particular, as shown in the multi-stage forging machine of FIG. 1, in the case of a structure having a large number of molds A and B, the replacement work is not only troublesome and inefficient, but also the tightening by individual bolts varies. Moreover, if the tightening force is too strong, it may cause seizure in the bearing part due to the relationship with the holder.In any case, depending on the feeling of the worker, the workability will be poor. Not only bad, but it causes various harmful effects.

The present invention addresses the above-mentioned situation and uses a toggle joint mechanism to hold a pressing rod against the peripheral side of a holder that holds a mold such as a die or punch without tightening it with a screw such as a bolt. The purpose is to advance and retreat in the axial direction to quickly and efficiently fix and release the mold, and to make the adjustment easy without varying the fastening force to the mold. .

[Means for solving problems]

The fixing device according to the present invention is a forging machine in which a die for forging and forming is held by detachably inserting it in a holder provided on a machine base or a ram in the axial direction,
Into a cylindrical body mounted on a part of the holder so as to intersect the axis of the holder, a pressing rod whose tip projects into a notch formed in the mold is inserted, and the pressing rod and the cylinder are inserted. The outer ends of the respective links in the toggle joint mechanism in which the middle is connected as a shaft attachment portion so as to be bent in a dogleg shape are pivotally attached to the respective end portions of the body, and further, the shaft attachment portion is
The tip of the connecting rod that is advanced and retracted by a cylinder provided on one side of the tubular body so as to sandwich the shaft attachment part is connected, and the other side is provided with a receiving rod that can be adjusted forward and backward with respect to the shaft attachment part. The feature is that they are screwed together.

[Action]

According to the device of the present invention, when the connecting rod is retracted in the direction in which the degree of refraction of the link is increased by operating the cylinder and the tip of the pressing rod is pulled out of the notch of the die, the die is inserted into the holder. It can be freely attached and detached. However, when the cylinder is operated again after the die is replaced and the lever is advanced to the receiving rod, the bending link approaches a straight state, and the tip of the pressing rod thrusts strongly into the notch of the die. Then, the mold can be fixed at a predetermined position in the holder. The pressing force of the pressing rod against the notch of the mold can be adjusted by appropriately advancing and retracting the receiving rod, and when several holders are arranged side by side, each of the lathe rods is moved forward and backward at the same time. By doing so, it can be attached and detached quickly.

〔Example〕

The present invention will be described below with reference to the embodiments shown in the drawings. In the figure, reference numeral 11 is a holder in which a ram 2 of a forging machine is mounted in front of a machine frame 2 ', which serves as a mold having a cutout B'in its peripheral surface through a bearing 12 inside. The punch B is loosely fitted so that it can be pulled out axially forward. 13 is the above holder
11 is a cylindrical body having an upper portion penetrating the lower portion of the holder 11 so as to intersect the shaft center of the holder, and is attached by a screw 14 on the side portion. A rod-shaped pressing rod 15 provided with 15 'is loosely inserted so as to be vertically movable, and an intermediate portion is axially attached 17 to a seat 16 fixed to the end of the cylindrical body 13.
Each of the ends of the two links 18 and 19 which are bent in a dogleg shape by pushing the pressing rod 15 and a seat 16 as a stopper.
A toggle joint mechanism 22 formed by connecting the pivots 20 and 21 to each other is interposed. In addition, one of the above links
When fixing 19 to the end of the tubular body 13, the seat 16 is used as shown in the figure to prevent oil leakage from the tubular body, and therefore the end of the link 19 is It does not matter if the body is directly pivoted 21. Reference numeral 23 designates a connecting rod for operating the toggle joint mechanism, the tip portion of which is connected to the shaft-attaching portion 17 (Figs. 3 and 4). The rod can be bent by an intermediate pin 23 ', and the cylindrical body 13 Provided on one side of the pipe 24
It is provided at the tip of a piston (not shown) in the cylinder 25 that is moved forward and backward by a fluid such as air or oil supplied and discharged via the. Reference numeral 26 denotes a receiving rod which is screwed to the other side of the cylindrical body in front of the connecting rod 23 in the axial direction with the shaft attaching portion 17 as an intermediate portion so that the shaft attaching portion can be adjusted forward and backward.

In the above description, the die is used as a punch, but the same can be applied to a die.

In the case of the above configuration, when the cylinder 25 is operated and the connecting rod 23 is retracted from the state shown in FIGS. 2 and 3, the doglegged links 18 and 19 are bent further than the illustrated angle. And the pressing rod 15 descends and the notch B'of the mold B
Since the protrusion 15 'comes out of the mold, the mold can be taken out forward. After replacing the mold B with another mold B and advancing the lathe 23 in the opposite manner, the links 18 and 19 are again in a straight line. Thus, the die 15 can be fixed at a predetermined position of the holder 11 by inserting the tip projection 15 'of the pressing rod 15 into the notch B'. Also, the notch B'of the protrusion 15 '
The pressing force against can be adjusted by moving the receiving rod 26 back and forth.

[Effect of device]

According to the present invention, the protrusion of the tip can be engaged with and disengaged from the notch of the mold by advancing and retracting the pressing rod in the axial direction by operating the cylinder. The exchanging work can be performed very quickly and efficiently, and the pressing and tightening force of the mold by the above-mentioned pressing rod can be uniformly set as much as possible by adjusting the receiving rod. The tightening can be made constant without variation, and by setting this adjustment first, the subsequent replacement of the same type of mold can be performed quickly and uniformly. Further, according to the present invention, since the pressing rod is pressed by the toggle joint mechanism, the force can be increased.

[Brief description of drawings]

FIG. 1 is a plan view of a main part showing an example of a forging machine, FIG. 2 is a side view showing a broken part of the device of the present invention, FIG. 3 is a front view of the same, and FIG. 4 is a shaft of a connecting rod. It is an expanded transverse sectional view in a core. A and B are molds, 11 is a holder, 13 is a cylindrical body, 15 is a holding rod, 16 is a seat, 17 is a shaft attachment part, 18, 19 is a link, 20 and 21 are pivotally attached, and 23 is a hammer. , 25 is a cylinder, and 26 is a receiving rod.

Claims (1)

[Scope of utility model registration request] 1. A forging machine in which a die for forging and forming is held by removably inserting it in a holder provided on a machine base or a ram in the axial direction, and a part of the holder is provided. Into the cylindrical body 13 which is mounted so as to intersect the axis of the holder, insert the pressing rod 15 whose tip projects into the notch formed in the mold, and insert the pressing rod and the end of the cylindrical body. The respective ends of the links 18 and 19 in the toggle joint mechanism 22 in which the middle is connected as the shaft attachment portion 17 so that they can be bent in a dogleg shape are pivotally attached to each of the above, and the shaft attachment portion 17 further includes: The tip of the connecting rod 23, which is advanced and retracted by a cylinder 25 provided on one side of the cylindrical body 13 so as to sandwich the shaft attachment part, is connected, and the other side part is adjusted forward and backward with respect to the shaft attachment part 17. A die fixing device for a press molding machine, which is characterized by screwing together a Uru receiving rod 26.