JPS646970Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the improvement of an extrusion molding die, and more specifically, to improve the cracking phenomenon at the corner of the bearing part (molding opening) in a solid die. This invention relates to an extrusion molding die that aims to prevent the above problems and improve the productivity and yield of extruded shapes.

[Conventional technology]

As shown in Fig. 4, in conventional dies of this type, when the bearing part a has a complicated shape and has many corner parts b, b..., metal is used in the corner parts b, b... Since concentrated stress was applied, cracks c, c, etc. were likely to occur.

[Problem that the invention attempts to solve]

The occurrence of cracks c, c... causes burrs and cracks in the shaped material, forcing a reduction in the extrusion speed, causing errors in the dimensions and shape of the shaped material, resulting in a decrease in yield, and damage to the die. This caused problems such as the extrusion molding becoming impossible.

[Means for solving the problem]

This invention was made with the intention of solving the above problem, and each corner of the bearing part on the metal supply side is provided with an inclined shape that widens toward the metal supply side in order to prevent corner cracks. A reinforcing part having an inclined surface is formed, and these reinforcing parts are in contact with each corner part of the bearing part, and are spaced apart from the bearing part in other parts, and the reinforcing part is in contact with each corner part of the bearing part. An object of the present invention is to provide an extrusion molding die that is continuous around the periphery of the extrusion molding die.

〔Example〕

This invention will be explained below based on FIGS. 1 to 3.

Fig. 1 is a front view of the solid die of this invention as seen from the metal supply side, and Fig. 2 is a sectional view taken along the - line in Fig. 1. In the figure, 1 is the die body; This is made up of a bearing part 2 having the same shape as the extruded part 7 for forming the extruded part 7 as shown in FIG. Further, on the metal supply side surface of the die body 1, a reinforcing part 4 is formed which is in contact with each corner part 2a, 2a, . . . of the bearing part 2 and connected to each other around the bearing part 2. In this case, the reinforcing portion 4 is in contact with the corner portions 2a, 2a, . . . but is spaced apart from other portions, and has an inclined surface 5 that expands toward the metal supply side.

Therefore, there is no fear that the reinforcing part 4 will interfere with the flow of metal, and metal can be smoothly supplied to the bearing part 2, thereby preventing the occurrence of cracks in the corner parts 2a, 2a, . . . in the bearing part 2. can be prevented.

Note that the distance between the reinforcing portion 4 and the portions other than the corner portions can be arbitrarily set depending on the shape of the bearing portion 2 and the like. Further, the reinforcing portion 4 does not need to completely contact the corner portions 2a, 2a, . . . of the bearing portion 2, and even if the reinforcing portion 4 is slightly separated from the corner portions 2a, 2a, etc., occurrence of cracks can be prevented. Furthermore, as shown in FIG. 2, if the bearing part 2 is formed at approximately 1/2 of the thickness of the die body 1 (so-called neutral plane),
The occurrence of cracks can be reduced. 6 is a back die.

[Effect of idea]

According to the die of this invention described above, the following effects are achieved. In other words, since the bearing part is near the neutral plane, the stress load is small.

Since the reinforcing portion is in contact with the corner where stress concentration is applied, the corner portion is reinforced and the occurrence of cracks can be prevented.

Since the reinforcing portion is spaced apart from the bearing portion in areas other than the corner portions, machining of the bearing portion is not hindered.

[Brief explanation of drawings]

Fig. 1 is a front view of the die of this invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a perspective view of a profile formed by the die of this invention.
FIG. 4 is a front view showing the main parts of a conventional extrusion molding die. In the figure, 1...Dice body, 2...Bearing part, 2a...Corner part, 4...Reinforcement part, 5...Slanted surface,
It is.

Claims (1)

[Scope of utility model registration request] In a solid die in which a bearing portion is bored in a die body, each corner portion of the bearing portion on the metal supply side is provided with a reinforcing portion having an inclined surface that widens toward the metal supply side in order to prevent corner cracks. The reinforcing portions are in contact with each corner portion of the bearing portion, and are spaced apart from the bearing portion in other portions, and the reinforcing portions are continuous around the bearing portion. Extrusion molding die.