JPS59232654A - Production of cylinder block - Google Patents

Abstract

PURPOSE:To obtain easily each upper deck on the top of each core by forming a jacketed die into the type provided with suitably spaced notches and cores existing deviately below the inside of the respective notches. CONSTITUTION:Plural pieces of suitably spaced notches 11 opening downward are disposed to a jacketed die 9 and spaces 12 are formed so as to exist on the upper side in the respective notches 11. Freely dischargeable cores 13 consisting of sand, etc. are set therein. If pressure casting is performed by using the die 9 of such type and the cores 13 are collapsed and discharged after the casting, internal passages 14 are obtd. and at the same time, upper decks 15 are integrally formed on the top. Higher rigidity is thus provided to jackets 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for making a cylinder block for an engine by guicasting.

Conventionally, this kind of method involves pressure casting a cylinder block body 0 having a plurality of cylinders a inside and a cooling water jacket b surrounding the cylinders as shown in FIGS. 1 to 3, for example. In this case, the jacket (b) is generally an oven deck type in which the top surface of the jacket (b) is completely open, as shown in the figure. The jacket wall d is separated from the cylinder wall θ on the inner circumference at the upper end, so its rigidity is impaired. In this case, the bolt hole f should be made by bulging the jacket salt d outward, and the width of the block body C as a whole tends to be increased. Curvature: involves the inconvenience of.

The object of the present invention is to obtain a method for manufacturing a cylinder block that does not have such inconveniences.The purpose of the present invention is to obtain a cylinder block body having a cylinder inside and a cooling water jacket surrounding the cylinder on its outer periphery by pressure casting. In the mold for making the jacket, a plurality of downwardly opening notches are provided in advance at appropriate intervals in the overall annular jacket mold in which the jacket is to be formed. A core made of other materials is set and prepared, and then after casting, the drawn core is discharged and an upper deck that closes the upper surface of the jacket is integrally obtained in the upper space.611 Implementation of the present invention An example of this will be explained with reference to the attached drawings.

Figure 4 shows an example of the obtained product, which consists of a cylinder block body (3) having a plurality of cylinders (1) inside and a cooling water jacket (2) surrounding the cylinders. The casting mold used is not particularly different from conventional ones, as shown in Figure 6, and consists of a fixed lower mold (4) and a movable upper mold (4). 5) and 1111, there are left and right hand parts (6) that can be opened and closed freely.
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The molten metal is guided into the internal cavity (through the lower runner (8) connected to this part to form the cylinder block body (3). This point is particularly different from conventional ones. do not have.

In the drawing, (9) indicates a jacket mold extending into the cavity (7) from above and acting on it to form the jacket (2) during pressure casting of the core body (3); 9) is fixed to the above-mentioned upper mold (51) via the mounting seat aO) in the mold body (9a) at the upper end thereof, and this point is not particularly different from the conventional mold, but according to the present invention. In this case, the mold (9) is configured as follows. That is, the mold (9) is provided with a plurality of notches (111) opening downward at appropriate intervals as shown in FIG. 7, for example. At the same time, each notch (tlJ has a space (2) on the upper side, and each core O stage made of sand or other material can be freely discharged and prepared.Thus, this type of mold (9) The above-mentioned pressure casting is carried out using the elbow core (13
) is collapsed and discharged, the inner passage (141) is opened and an upper deck (15) is integrally formed on the upper side, thereby increasing the rigidity of the jacket (2). (As the material for 1'5, for example, those described in q'ke Publication No. 57-59013 can be used as appropriate.

In the illustrated example, the nuclear core α4 has a stepped portion (15a) that bulges inward to a relatively wide width and is recessed on the outer side of its upper surface. On the upper side of the cylinder head, there is a screw hole for the 7F pole between the cylinder head and the cylinder head.
16) so that the thick boss portion (l″D) to be formed is integrally obtained as a small protruding portion of the outer side of the upper deck, and thus the screw hole Q6 is extended outward by 9Iim. te f
This eliminates the above-mentioned disadvantages of the conventional f&.

In this way, according to the present invention, the jacket mold is of a type that has notches at appropriate intervals and each core that is offset downward in each notch, and the cores are dismantled after casting. 1 It is easy to obtain upper decks on the upper side of each core and to obtain excellent products. Furthermore, each core is relatively small in each notch, so it is suitable for pressure casting. It has the advantage that it can be easily obtained and does not cause any inconvenience.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an example of a conventional product, Fig. 2 and Fig. 5 are cross-section views of the product obtained by the method of the present invention. Example plan view, 5th
The figure shows the V-V line cut fQi ll1I! JN Figure 6 is an explanatory diagram of the casting state taken along the line ■-■ in Figure 4, and Figure 7
The figure is a front view of a part of the jacket mold, and FIG. 8 is a cross-sectional view taken along the line ■-■. tlJ...Cylinder (2)...Cooling water jacket (3)...Cylinder block body (9)...
Jacket mold (111...notch part (121)
... Upper space α... Core (151... Upper deck patent applicant: 2 people other than Honda Motor Co., Ltd.)

Claims (1)

[Claims] In a type in which a cylinder block body having a cylinder inside and a cooling water jacket surrounding the cylinder block is made by pressure casting, a generally annular jacket mold in which the jacket is to be carved is opened downward in advance. A plurality of notches are arranged at appropriate intervals, and a core made of sand or other material is set and prepared in each notch with a space above, and then after casting, the drawn core is discharged and the core is drawn. A method for manufacturing a cylinder block, in which an upper deck for closing the upper surface of the jacket is integrally provided in the upper space.