JPH0336621B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a punch set mold holder used for punching metal plates and the like, and particularly to a method for casting an aluminum alloy mold holder.

A mold holder called a so-called swan neck holder is used to hold punch and die molds used for stamping metal plates and the like on the same support member. This mold holder is conventionally FCD45
(Class 2 spheroidal graphite cast iron) or other wear-resistant metal materials were used. However,
Since this type of material is heavy, it is extremely inconvenient to handle during setup and other operations.

To solve this problem, aluminum alloy castings such as A-2C are used, but in this case, sliding parts such as guides are prone to wear, and the compressive strength of the die attachment part is insufficient. There are some drawbacks, such as whether it is sufficient.

The present invention has been made with the object of solving the above-mentioned problems and providing a method for manufacturing a mold holder that is lightweight, easy to handle, and has excellent wear resistance and compressive strength.

The present invention, which achieves the above object, solves the above problems by forming the punch and die mounting portions of the mold holder from a wear-resistant metal material, and forming the other portions from an aluminum alloy. It is something. That is, in the method of the present invention, a core made of a wear-resistant metal material and having an engaging portion on its outer circumferential surface is placed at a position corresponding to the punch and die mounting portion in a mold for casting a mold holder, and The main idea is to cast aluminum alloy inside. When the punch and die cores are formed independently and cast, a lathe or the like is used to align the axes of the punch and die in the finished cast product. On the other hand, when the punch core and the die core are integrally formed, alignment is not necessary if the formed casting is divided by cutting between the punch mounting portion and the die mounting portion.

Hereinafter, details of the embodiments will be described with reference to the drawings.

FIG. 2 is a partially sectional side view of a mold holder to which the method of the present invention of FIG. 1 is applied. The mold holder 1 has an upper arm portion 3,
It consists of a lower arm part 5 and a torso part 7, and has a so-called swan neck shape. A punch 9 and a die 11 are attached to the distal ends of the upper arm 3 and lower arm 5 on the same vertical axis.

FIG. 2 is a sectional view of a mold for casting the mold holder 1, and 13 is a sand mold formed by a normal molding method. The core 15 shown by diagonal lines in the figure is made in advance from a wear-resistant metal material such as FCD45, and placed in the sand mold 13 as shown. The position corresponds to the mounting portion of the punch 9 and die 11 of the mold holder 1.

FIG. 3 is a perspective view showing the shape of the core 15. The core 15 is provided with engagement unevenness, that is, a large number of circumferential grooves 17 on its outer peripheral surface. This groove 17
This is to prevent the core 15 from separating from the cast body after casting. Reference number 19 indicates a hole provided for discharging scrap during sheet metal stamping.

Molten aluminum alloy such as A-2C is injected from the injection port 21 into the mold 13 shown in FIG. 2 formed as described above to perform casting. FIG. 4 is a side view of the cast product taken out from the mold after casting, with the core 15 embedded in the tips of the upper arm 3 and lower arm 5, and the punch and die parts connected. There is. Therefore, this connecting portion (the shaded portion in the figure) is cut off by cutting to separate the upper arm portion 3 and the lower arm portion 5. In this case, an example is shown in which the mounting portion of the die block 27 (see FIG. 1) is also machined at the same time.

FIG. 5 is a side view showing the completed state of the mold holder 1 with the die block 21 assembled and punch and die mounting holes 23, 25. Dive block 27
Its outer shape is machined in advance, and it is assembled at the machined location described above. Incidentally, it is preferable that the mounting holes 23 and 25 for the punch 9 and the die 11 be subjected to final processing. Furthermore, the inner surfaces of the punch/die mounting holes 23 and 25 are burnished.

As described above, a mold holder in which the punch/die mounting part is made of a wear-resistant metal material such as FCD45 and the other part is made of an aluminum alloy such as A-2C is superior to a conventional FCD holder. For example, the weight is about half that, the vertical sliding part of the punch guide has the same wear resistance as the conventional product, and the strength of the die attachment part is also the same as that of the conventional product.

As is clear from the above explanation, in the mold holder casting method of the present invention, a core made of a wear-resistant metal material and having engagement unevenness on the outer circumferential surface is placed at a position corresponding to the punch and die mounting part. Since the mold holder is manufactured by casting aluminum alloy into the placed mold, the weight is significantly reduced compared to conventional mold holders, and it is extremely easy to handle for work such as setup during use. Become. In addition, sliding parts and parts subject to compressive force are made of wear-resistant materials such as FCD45.
Made of high compressive strength material, there is no need to worry about wear or breakage. Furthermore, since the core is cast into the aluminum alloy with an engaging portion provided on the outer peripheral surface,
It firmly adheres to the cast body and will not separate during use. Thus, the present invention solves the conventional problems and provides a method for manufacturing a mold holder that is lightweight, easy to handle, and has excellent wear resistance and compressive strength.

[Brief explanation of the drawing]

The drawings all show examples, and FIG. 1 is a partially sectional side view showing an example of a mold holder to which the method of the present invention is applied, and FIG. 2 is a sectional view of a mold for casting the mold holder. FIG. 3 is a perspective view showing the shape of the core, FIG. 4 is a side view of the cast product after casting, and FIG. 5 is a side view showing the finished state of the cast mold holder. 1... Mold holder, 3... Upper arm, 5... Lower arm, 7... Torso, 9... Punch, 11... Die,
13... Sand mold, 15... Core, 17... Groove, 19
... Scrap discharge hole, 21 ... Injection hole.

Claims (1)

[Scope of Claims] 1. A core made of a wear-resistant metal material and provided with an engaging portion on its outer circumferential surface is placed at a position corresponding to the punch and die mounting portion in a mold for casting a mold holder, and A mold holder casting method characterized by casting an aluminum alloy inside. 2. The mold holder casting method according to claim 1, wherein the core is formed by integrally forming a punch hole and a die core on the same axis.