JPS6048259A - Deburring method of die-casted product - Google Patents

Abstract

PURPOSE:To simplify the deburring process by inserting a plurality of bending punches into each penetration hole along the axis line of a die-casted product and bending the burr along the edge surface of the hole and carrying-out shot work, thus removing the burr on a plurality of penetration holes of the same time. CONSTITUTION:The burr formed on the penetration hole 3 on a die-casted product on which burr is removed from the outer peripheral part is bent by a bending process. In the above operation, the die-casted product 1 is set onto a holding base 13 by a carrying-in apparatus, and a burr removing pin 14 equipped with a guide and a bending punch 15 are arranged at the position opposed to the die-casted product 1, and the pin 14 is arranged at the position opposed to the penetration hole 1a in the center part of the die-casted product 1, and the bending punch 15 is arranged at the position opposed to the penetration hole 3 in the side peripheral part of the die-casted product 1. When a movable base 12 is shifted to a fixed base 10 side by a piston, the die-casted product 1 is correctly positioned by the pin 14, and the burr formed on the penetration hole 3 on the die-casted product 1 is bent along the edge surface of the hole 3 by the top edge of the punch 15, and then shot work is carried-out.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for removing burr around the through-hole of a die-cast product having a through-hole, and the uses of the die-cast product obtained by the method of the present invention include Although not particularly limited, it is effective for use in, for example, the frame of an alternator.

(Description of Prior Art) Conventionally, a process as shown in FIG. 1 has been used as a method for deburring die-cast products having through holes (1). In other words, the trimming process Y on the outer periphery of the die-cast product
Then, as shown in FIG. 2, the thin film-like paris 2 formed in the through hole is removed by a cutting process U, and then the die-cast product is carried into a sillage machine and small particles are injected at high speed. A shot process was used to completely remove the burr on the end surface of the through hole 3.

However, this conventional method requires a special cutting process, and especially when a large number of through holes 3 are formed in one die-cast product, the time required for cutting becomes extremely long, making it difficult to manufacture die-cast products at high speed. The problem was that it became impossible to do so.

On the other hand, as shown in FIG. 3, a method is also known in which a punching process (2) is used instead of the cutting process (U).

In this process, a punch 2 formed in a through hole is punched out using a punching jig 4, as shown in FIG.

However, this punching jig does not reciprocate in the downward slope S with respect to the axial direction 0 of the die-cast product 1 (2), so if there are multiple through holes 3, the die-cast product 1 is punched multiple times while shifting. The jig 4 had to be moved back and forth. Therefore, there was a problem that high-speed manufacturing was not possible. In addition, in order to punch out the holes 2 in a large number of through-holes 3 at once, it is necessary to provide a large number of deburring jigs 4, and since the reciprocating directions S of the deburring jigs 4 are different from each other, , the mechanism required for reciprocating motion becomes extremely complicated. Therefore, there is a drawback that the deburring device becomes expensive.

(Objective of the present invention) The present invention was devised in view of the above points, and an object of the present invention is to enable deburring of a plurality of through holes to be simultaneously removed, thereby significantly shortening the deburring process.

(Structure of the present invention) Therefore, in the present invention, a plurality of bending punches facing the plurality of through-holes are inserted into each of the through-holes along the axial direction of the die-cast product, and the edges formed in the through-holes are aligned with the ends of the through-holes. (3) adopts a structure in which the paper is folded along the edges, and then the edges are removed by a two-step process.

(Explanation of Examples) An embodiment of the present invention will be described below based on the drawings.

FIGS. 5 and 6 show an example of a die-cast product to which the method of the present invention is applied, and in this example, it is a frame for an automobile alternator. This die-cast product 1 is molded from an aluminum die-cast alloy (ADC12), and has a large number of through holes 3 formed in its outer peripheral side surface.

Since this die-cast product solidifies in the mold space between the mating surfaces of the movable mold and the fixed mold in the die-casting machine, a thin film-like Paris 2 is integrally formed around the die-cast product 1 and inside the through hole 3. is formed.

In this example, a deburr removal step for removing the deburr 2 formed in the through hole 3 is performed as shown in FIG.

That is, the trimming step Y removes the burrs formed on the outer circumference of the die-cast product 1. This trimming process
The die-cast product 1 is placed in a platform shape having a punched hole in the shape between its outer circumference (4), and in this state, the die-cast product 1 is sucked into the punched Omukai,
This removes the burr on the outer periphery.

Then, in step II, the ribs 2 formed in the through holes 3 of the die-cast product 1 from which the peripheral ribs have been removed are bent in a bending step II.

This folding step is carried out by a folding press device as shown in FIG. 10 in Figure 8 is a fixed base;
Reference numeral 11 indicates a guide bar vertically protruding from the fixed base, and reference numeral 12 indicates a movable base slidably installed on the guide bar. The movable table 12 receives driving force from a hydraulic piston (not shown) and reciprocates in the vertical direction in the drawing.

Reference numeral 13 denotes a holding stand disposed on the fixed base IO, and the die-cast product 1 is placed on this holding stand 13 by a forging device (not shown). A deburring bin 14 with a guide and a bending punch 15 are disposed at a position facing the die-cast product 1 on the movable table 12. In particular, the guide-equipped deburring bin 14 is disposed at a position (5) facing the through hole 1a in the center of the die-cast crystal 1, and the bending punch 15 is located at a position facing the through-hole 3 at the side circumference of the die-cast product 1. It is located in Then, the tip of the deburring bottle 14 with a guide and the die-cast product 1
The gap between the bending punch 15 and the die-cast product 1 is smaller than the gap l between the bending punch 15 and the die-cast product 1.

A tapered guide portion 14a is formed at the tip of the guide-equipped deburring bin 14, and the die-cast product can be accurately positioned by this guide portion 14a. On the other hand, the tip 15a of the bending punch 15 is formed into a flat shape, and when the tip 15B comes into contact with the edge 2, the edge can be bent.

That is, when the movable base 12 is moved toward the fixed base 10 by a hydraulic piston (not shown) (the state shown in FIG. 9), the die-cast product 1 is first accurately positioned using the guide-equipped deburring bin 14. Thereafter, the edge formed in the through hole 3 of the die-cast product 1 is bent along the edge of the through hole 3 using the tip of the bending punch 15. In particular, this bending position W(6) is along the lower end face of the through hole 3, as shown in FIG.

Then, since the Paris is plastically deformed at the bending position W, the metal structure at that part W is hardened and becomes brittle.

Next, the die-cast product is carried out from the bending press machine,
Shirosoto is performed using a shot device 20 as shown in FIG. In this Shiroso process, 111.0 to 1.5
■■ aluminum alloy particles 21 are transported at high speed (73m).
/ sec ) to collide with the die-cast product 1. At this time, since the die-cast product is rotated by the rotating roller 22, the particles 21 collide with the die-cast product 1 from all directions. Then, since the W that is bent in the above process is extremely fragile, the paris 2 formed in the die-cast product in this state is caused by the collision of the particles 21.
is removed from the bending position W.

The deburring process is completed through the above steps, and then the die-cast product 1 is further precisely finished in the cutting process W.

(7) In addition, in the above example, the edge 2 of the through hole 3 was bent after the edge on the outer periphery of the die-cast product 1 was removed in the trimming process Y, but the trimming process Y and the bending process H can also be performed at the same time. It is.

(Effects of the Present Invention) As explained above, according to the method of the present invention, it is possible to efficiently remove burrs generated in a plurality of through holes formed in a die-cast product. Therefore, it has the excellent effect of being able to significantly shorten the time required for deburring die-cast products.

[Brief explanation of drawings]

Fig. 1 is a process diagram showing a conventional deburring method, Fig. 2 is a sectional view explaining the cutting process shown in Fig. 1, Fig. 3 is a process diagram showing a conventional deburring method, and Fig. 4 is a process diagram showing the cutting process shown in Fig. 1. 5 is a front view showing an example of a die-cast product; FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 5;
The figures are process diagrams showing an example of the method of the present invention, Figures 8 and 9.
The figure shows a sectional view of the bending press device (8) used in the folding process shown in Fig. 7, Fig. 10 is a sectional view showing the punching process using the machine shown in Fig. 8, and Fig. 11 shows the sheet shown in Fig. 7. FIG. 2 is a perspective view showing a shot device used in the process. ■...Die-cast product, 2...Paper, 3...Through hole, 15...Bending punch. Representative Patent Attorney Takashi Okabe (9) Figure 9 10 Figure 10 Figure 11

Claims (1)

[Claims] A method for deburring a die-cast product having a plurality of through holes, the method comprising: inserting a bending punch into the through-hole along the axial direction of the die-cast product, and deburring formed around the through-hole along the periphery of the through-hole. A method for removing burr from a die-cast product by bending the product, and then spraying small particles onto the die-cast product at high speed to remove the burr along the bending line.