JPS5916532B2 - Bearing hole machining method in aluminum extrusion molding die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for machining bearing holes in aluminum extrusion molding dies, and is characterized in that a plurality of different bearing lengths and choking of each bearing part can be performed at the same time. be.

Traditionally, aluminum extrusion dies are made of metal (
The main methods used to adjust the flow rate of the billet were to change the length of the bearing, or to add a chamfer or rounded choke to the side of the bearing that was in contact with the billet.

In particular, adding a choke was very effective in subtly adjusting the flow of metal.

However, at present, this work of attaching the chalk is mainly done manually by skilled workers, which causes problems such as making the dice expensive and varying the degree of stacking.

On the other hand, electric discharge machining technology has recently progressed, and with this advancement, aluminum extrusion molding dies can be machined directly using wire electrode electric discharge machining means without using electrodes. The technology to do this is about to be established, and taper machining for choke attachment is also becoming possible.

However, there are the following problems when directly machining dies having a plurality of different bearing lengths with a choke using this wire electrode electrical discharge machining.

That is, as shown in Fig. 1, in a die having bearings of different lengths, such as a bearing length A and a shorter bearing length a, a constant choke angle θ' is set, and the center of the line electrode is fixed. When electrical discharge machining is performed with d constant and a choke is attached to the entire surface of the bearing part with bearing length A, in this case, the choke length of the bearing length A part is B' (=A), and the bearing length is The part b has a choke length b (=a), but the opening C that determines the thickness of the profile has a bearing length a depending on the bearing length as shown in the drawing. ), which is an inconvenience.

Therefore, in order to align the apertures C in consideration of the bearing length, it is necessary to change the running center d of the wire electrode according to the bearing length, but this method requires the bearing length to be memorized in advance, and the computer In addition to complicating the program, there are problems such as the connection of different bearing lengths is not smooth.

This invention was made in consideration of the above circumstances, and focuses on the technology of wire electrode electrical discharge machining to set the length of each bearing part without changing the opening of the bearing part, and at the same time to choke each bearing part. This invention provides a method for machining bearing holes in dies for aluminum extrusion molding, which is characterized by the following: According to this invention, most of the work of attaching chokes to dies, which conventionally required skill, can be mechanized, resulting in labor savings. This method not only improves the accuracy of the die, but also enables mechanized production without significantly changing the scope of conventional die design and production.

Embodiments of the present invention will be described in detail below with reference to FIGS. 2 to 5.

In the accompanying drawings, FIG. 2 shows a schematic front view of the die 1 processed by the method of the present invention.
As shown in the figures, the bearing length is B1. B2. Different substantially U-shaped bearing portions 2 are formed as indicated by B3.

The case where the die 1 formed in this way is processed by the method of the present invention will be explained with reference to FIGS. A constant back flank surface 3 is provided regardless of the force 2, and the die material, that is, the surface 4011J that can be in contact with the billet of the bearing portion 2 of the die 1, is processed by wire electrode electrical discharge machining means (not shown) with a constant taper angle θ. ), the portion tl of the bearing portion 21 with the bearing length B1 is chamfered and removed, and the portion t2 of the bearing portion 2□ with the bearing length B2 is chamfered and removed, and the most opening is removed. The t3 (7) portion of the bear link part 23 with the narrow bearing length B3 is chamfered and removed, and each bearing part 2□, 2□, 2
The bearing lengths B, B2 and B3 of the die 1 are the lengths obtained by subtracting the chamfering portion from the distance ML between the die 1 that can contact the billet of the die 1 and the back escape die 3.

That is, B1=L-4, B2=L-42, B3=L
-A3.

(However, tl<t2<t3.

) Therefore, the bearing lengths B, , B2 . The lengths of B3 are set at the same ratio according to the ratio of the respective openings, and the choke 5 is attached to the side of the surface 4 that can come into contact with the billet.

In addition, when the bearing opening is extremely narrow, in FIG. 6a showing the conventional method and FIG. 6b showing the method of the present invention, if the same choke α is used and the length of the bearing 2 is changed toward the billet outflow side as in the conventional method. , it is inconvenient that a step a appears on the exit side, and this is a problem even when taking into consideration the fall of the die toward the exit side.

Therefore, in the present invention, as shown in FIG. 6b, since the length of the bearing 2 is changed by providing the recessed portion 6 on the billet inflow side, there is no difference in level even if the choke α is the same.

As explained above, the method of the present invention makes it possible to align the back flank surfaces of dies with various bearing lengths to a constant level regardless of the bearing length, and to compensate for changes in bearing length. Since it is provided on the side that can come into contact with the billet, it is possible to easily machine each bearing hole with a different bearing length using wire electrode discharge machining while maintaining a constant taper angle. It is possible to add

Therefore, with this castle gate, attaching a choke to a die, which conventionally required skill, can be mechanized, saving labor and improving the accuracy of the die.Moreover, the scope of conventional die design and manufacturing can be improved. It has remarkable effects, such as being able to produce it by mechanization without major changes, and its utility value is remarkable.

[Brief explanation of the drawing]

In the accompanying drawings, Fig. 1 is an explanatory diagram of conventional dies with different bearing lengths subjected to wire electrode discharge machining to form chokes, and Fig. 2 is a schematic front view of dies to which the method of the present invention is applied. , FIGS. 3 to 5 are enlarged sectional views taken along the lines ■-■, IV-IV, and V-v in FIG. 2, respectively, and FIG. 6 shows another static state formed by the method of the present invention. FIG. 3 is a partial cross-sectional view of the die. In the figure, 1...Dice, 2 (21=2
2.23). 2'... Bearing part, 3... Back flank surface, 4, 4'... Surface that can come into contact with the billet, 5.
...Chalk, 6...Drilling part, 7.
...Bearing length adjustment protrusion, B1. B2. B
3... Bearing length.

Claims (1)

[Claims] 1. When manufacturing aluminum extrusion molding dies with multiple different bearing lengths, the die material used to process the bearing part is provided with a constant back flank surface regardless of the bearing length, and the die material is The hemlock side of the bearing part that is in contact with the billet is chamfered and removed using a wire electrode electrical discharge machining method with a certain taper angle, so that the length of each bearing part can be set and at the same time a choke can be formed on each bearing part. A bearing hole machining method in an aluminum extrusion molding die, characterized by: