JPS63108956A - Mold for centrifugal casting - Google Patents

Abstract

PURPOSE:To continuously produce an as-cast product having irregular shape on the circumferential face by arranging an oscillating plate having a supporting point at the position biasing the center of gravity in built-in space of an upper mold and constituting while keeping it to circular-shape by holding the assembling mold toward circular center direction by centrifugal force of the oscillating plate at the rotation of mold. CONSTITUTION:The forming molds 11 having respectively semi-circular shaped forming part 9 are arranged at the center part in the built-in spaces 5 of upper and lower molds 1, 2 loaded on a rotary disk 3 and the oscillating plate 14 supported on a supporting pin 15 is arranged at the back face of forming mold 11. At the time of rotating the mold, one end of the oscillating plate 14 is moved toward circumferential direction by the centrifugal force and so the other end of the oscillating plate 14 holds the forming mold 11 toward the circular center direction, to keep it to circular center. After forming the product 19 by the molten metal poured from a sprue 4, by stopping the rotation of mold, the forming molds 11 are opened by a pushing spring 13. In this way, the as-cast product having irregular shape on the circumferential face is continuously produced.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention mainly relates to a mold for centrifugal casting of small articles.

Originally, centrifugal casting has the advantage of being able to produce hollow cast products without a round core, and has a high product yield, resulting in less melting and less waste.Among the various casting methods, It is noteworthy for its economic efficiency. However, if the product has irregularities on its circumferential side, it is difficult to obtain the product using conventional centrifugal casting. The present invention aims to easily and continuously obtain centrifugally cast products having an uneven circumferential side surface, and the fields of application thereof are vast.

(b) Conventional technology In order to obtain a product with uneven side surfaces by centrifugal casting, the mold must be a split mold made by combining two semicircular molds, but when using the conventional method, this split mold This method involved fixing the parts by tightening bolts, etc. (by rotating them together, casting, and then opening the 9-piece mold to take out the product. It was difficult to continuously cast the molds in the same mold.

(c) Problems to be Solved by the Invention The present invention firmly holds a split mold in a circular shape and automatically and easily moves from holding to releasing the mold. This was an attempt to perfect a technology for mass producing precision centrifugal castings that did not require side machining.

(d) Means for Solving the Problems The present invention attempts to tightly fit split molds that are set in a normally open state by a push spring using centrifugal force during nine rotations. In other words, one end of the oscillating plate, which is attached to be able to move freely with the center of gravity as a fulcrum, moves in the circumferential direction due to the centrifugal force generated when the mold rotates. By pressing in the direction of the center of the circle, the split mold is held in a circular shape at the center of the circle.

(E) Example An example of the present invention will be explained with reference to FIGS. 1 to 4 and 9. The upper mold (1) and the lower mold (2) are connected to a part of the inlet provided on the outer periphery of each mold. They are fitted and assembled and placed on a one-turn disc (3). The upper mold (1) has a circular pouring spout (4) on its surface and a built-in chamber (5) on its inner surface. Further, an oval recess (6) is fitted into the ceiling of the built-in chamber (5). Furthermore, a bag-shaped sub built-in chamber (7) fitted from the direction of the built-in chamber (5) is provided at a relative position in the outer peripheral thick part of the upper mold (1).

Similarly, a circular hole (8) is provided at a relative position in the outer peripheral thick portion, and is fitted from the circumferential direction toward the center of the circle.

In the center of the built-in chamber (5), there is a mold circle that is semicircular and has a molding part (9) on the inner surface, and has a notch part (10) on the upper and lower surfaces.Mold α A shaft a2 is attached to the back of each sword, and the head of the shaft is housed in a circular hole (8) on the outer periphery of the upper mold (1) together with a spring ring. There are 14 rocking plates (14. One end of the rocking plate σ4 is located at the back of the mold Qll, and the weight part at the other end is located in the sub-built-in chamber (14) on the outer periphery of the upper mold.
7), it is movably attached by a fulcrum pin (lEi), and a notch for passing the shaft α2 is provided at the tip on the mold u side. In addition, on the lower surface of the built-in chamber (5) of the upper mold (1), there is a cover 1 having an oval hole in the center as shown in FIG.
0 is installed.

This oval hole is the same as the recessed part (6) of the upper mold (1).

Incidentally, instead of attaching a weight part to the rocking plate (141) as in the present embodiment, a method can be implemented in which a different material is used for that part to give weight.

5 to 8 show different embodiments of the present invention, but the difference from the above-mentioned embodiments of FIGS. 1 to 4 is the relationship between the rocking plate (I41 and the weight α7). One end of the rocking plate 04 is located at the back of the mold circle, but the other parts are housed in the sub built-in chamber (7) on the circumference of the upper mold (1), and only the tip part is located in the built-in chamber. (5), and the shape of its tip is such that it is easy to store the weight (17).

The heavy sleeper Q has a disk shape, and the rocking plate (14) is connected to the built-in chamber (5).
) is placed in such a way that it can move freely through its own unique space.

1. Regarding the implementation of the present invention, as shown in FIGS. 10 to 11, a mold circle that needs to be worn out and replaced is built into a holder (181), a notch σa and a shaft (1'). It is also possible to carry out a method in which the holder 08 is processed for attachment and stored in the built-in chamber (5), and only the holder 08 is used permanently. are two sets each, but it is also possible to change this number and combine them.

(F) Function To explain the function of the embodiment of the present invention, when the product u9 is removed from the state shown in FIGS. A strong centrifugal force is exerted on it, causing it to move in the circumferential direction and be housed in the sub internal chamber (7) as shown in Fig. 3.As a result, one tip of the rocking plate σ4 is shaped in the direction of the center of the circle. Press the mold (111). Two rocking plates (
14) has the same operation, so two semicircular molds (
11 are pressed from both sides to form one circular mold. In this case, the force of the push spring 13 should be adjusted so that the centrifugal force of the rocking plate (14) mentioned above acts against the force of the push spring αa that keeps the semicircular mold full open at all times. Need more products! It is necessary to determine various elements such as the weight of 9, the size of the mold (Ill), the size of the weight part of the rocking plate (141), and the rotation speed of the mold based on test data.In this way, When the manufactured mold is rotated, the mold 111) is held in a circular shape, and at that point an appropriate amount of molten metal is injected from the pouring hole (4) on the surface. Product i1 in the molding section of
'l.

The state shown in FIGS. 3 and 4 is reached. Next, when the rotation of the mold is stopped when the product α9 has hardened, the centrifugal force disappears, so the rocking plate (14) becomes freely shaped as shown in Figures 1 and 2, and the push spring (Ia) Since the mold C11l is expanded to both sides, the product (19) can be taken out. In this case, the range of opening and closing of the mold (11) is limited to the upper mold (
1) The notches aQ provided on the upper and lower surfaces of the mold I are fitted into the oval inner surface recess (6) and the oval hole of the cover (18) to form a movable range. .

As mentioned above, the only difference in the operation of the embodiments shown in FIGS. 5 to 8 is the relationship between the rocking plate (14) and the weight α. That is, due to the rotation of the mold, the weight r in FIG. 5 automatically fits into the tip of the swing plate U4 as shown in FIG. (14) in the circumferential direction and
).

Accordingly, the other end of the swinging temporary housing 4 presses the mold Ql) in the direction of the center of the circle to hold the semicircular mold (11) in a circular shape. After molding the product α9, when the rotation of the mold is stopped, the rocking plate (14) is moved again as shown in Fig. 5.
loses its centrifugal force, the push spring circle expands the mold (111), and the weight (1) is released from its storage position.Then, the upper mold (1
) on the lower mold (2) surface (1g
The process is repeated by removing the mold, cleaning the mold, spraying a working coating, reassembling the mold, and rotating it.

(G) Effects of the Invention By implementing the present invention as described above, products having an uneven surface on the outer periphery can be produced automatically at high speed. Also,
It is also effective for producing products that do not have uneven surfaces on their outer peripheral surfaces. If the product has a straight outer circumferential surface, it can be centrifugally cast as a one-piece mold with a draft angle, but in that case, the product must be removed from the mold after it has sufficiently cooled, hardened, and shrunk in the mold.9 When using the mold according to the invention.

When the molten metal has hardened to such an extent that the shape of the product does not change after being poured into the mold, the product can be taken out of the mold while still in a red-hot state. This greatly reduces the speed of centrifugal casting of products, making mass production possible.

[Brief explanation of the drawing]

Fig. 1 is a back view of the upper mold according to an embodiment of the present invention when the cover is removed when it is at rest, Fig. 2 is a cross-sectional view of the assembled mold with the cover attached, and Fig. 3 is a rotation of the upper mold shown in Fig. 1. Back view of time, No. 4
Figure 5 is a cross-sectional view of the assembled mold with the cover attached, Figure 5 is a back view of the upper mold of a different embodiment of the present invention with the cover removed, when it is at rest, Figure 6 is a cross-sectional view of the assembled mold with the cover attached, Figure 7 is a back view of the upper mold shown in Figure 5 when it is rotated, Figure 8 is a cross-sectional view of the assembled mold with the cover attached, Figure 9 is a plan view of the cover, and Figure 10 shows the mold being placed in the holder. FIG. 11 is a cross-sectional view showing the installed state, and is a cross-sectional view taken in a direction 90 degrees different from FIG. 10. Explanation of symbols 1... Upper die 2... Lower die 3... Turntable 4...
・Pouring port 5...Built-in chamber 6...Concave part 7...Sub-built-in chamber 8...Circular hole 9...Molding part 10...
Notch 11...Mold 12...Shaft 13...
- Push spring 14... Rocking plate 15... Fulcrum pin (fulcrum) 16... Cover 17... Weight 18... Holder 19... Product.

Claims (2)

[Claims] (1) A rocking plate (14) is installed in the built-in chamber (5) of the upper mold (1).
is mounted freely with its center of gravity as a fulcrum (15), and when the mold is rotated, one end of the rocking plate (14)
A mold for centrifugal casting, characterized in that the mold (11) is held in the circumferential direction by moving in the circumferential direction due to centrifugal force and the other end moving in the circumferential direction accordingly. (2) A weight (17) is placed in the built-in chamber (5) of the upper mold (1), and when the mold is rotated, the weight (17) moves one end of the rocking plate (14) of the upper mold (1). A mold for centrifugal casting according to claim 1, characterized in that the mold is pushed up in the circumferential direction.