JPH0519173Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is designed to set a cast member that is cast along a valve hole or an opening of an auxiliary chamber in a mold when casting a cylinder head. Regarding the type structure for.

(Prior Art) The cylinder head of an engine becomes hot due to the combustion gas as the fuel explodes within the combustion chamber, and is constantly subjected to the large impact of the explosion. Therefore, it is necessary to have a structure with excellent heat resistance and impact resistance. In particular, the bridge parts between the intake valve hole and the exhaust valve hole, and between each valve hole and the auxiliary chamber are susceptible to cracks and deformation, so the heat resistance and impact resistance are improved the most. It is necessary to do so.

Therefore, in order to prevent cracks and deformation of this bridge part, various methods have been devised in which metal with excellent heat resistance and impact resistance is integrally cast in this part (for example, 48-17431).

During casting, the method of setting the metal with excellent heat resistance and impact resistance (hereinafter referred to as a cast member) into the mold is the method described in
As described in Publication No. 48-17431, there are methods in which a cast member is supported in a predetermined position within the mold using bolts attached to the mold, a method in which the cast member is fixed to the mold with nails, There were some cases in which the surrounding parts were attached to the mold using adhesive.

(Problems to be solved by the invention) However, with the above-mentioned conventional means for setting the cast member in the mold during casting,
The following problems arose.

First, with bolts, it is necessary to provide a part in the cast member for the bolt to be screwed into, which increases the heat capacity and makes it difficult to weld with the casting material being poured. There was a problem in that parts were required and manufacturing costs were high.

In addition, those that are fixed to the mold using nails,
There is a high incidence of defective products due to mold breakage and sand residue, and in addition, each cast member must be nailed at multiple locations, which causes problems such as decreased productivity and increased manufacturing costs. It was hot.

When casting parts are fixed to the mold with adhesive, it takes a long time to dry after gluing,
Since it is bonded to sand, it is not easy to ensure sufficient adhesion strength, resulting in problems such as peeling.

Moreover, those using nails and adhesives
Another problem was that it was not easy to accurately set the cast members.

The present invention was devised in view of the above problems, and its purpose is to provide a mold structure that allows a cast member to be easily and accurately set in position.

(Means for solving the problems) Means for solving the above problems will be explained based on the drawings.

A cast-out part 2 provided in the lower mold 1 in the lower mold 1
An arc-shaped convex portion 4 is formed with the center at The cast member 3 is placed in a predetermined position in the mold by abutting the inner periphery 4a of the convex portion 4 and pushing the wedge 6 into the wedge hole 5 while slidingly contacting the outer periphery 3a of the cast member 3. It is fixed.

(Function) Since the inner periphery 4a of the arc-shaped convex portion 4 formed on the lower die 1 is brought into contact with the outer periphery 3a of the cast member 3, positioning can be performed accurately and easily.

Furthermore, the cast member 3 is connected to the protrusion 4 and the wedge 6.
Since it is sandwiched between the two parts, it can be firmly fixed at a predetermined position of the lower mold 1.

In this way, the cast member 3 can be firmly set in an accurate position within the mold with an extremely simple structure.

(Example) Next, an example of the present invention will be described based on the drawings. In this embodiment, a mold structure for casting a cast member into the opening of the auxiliary chamber of the cylinder head will be described.

As shown in FIG. 2, the lower mold 1 is provided with a cast-out part 2 for forming a sub-chamber in the cylinder head. On the outside of the cast-out part 2, there is an arc-shaped convex part 4 having an inner circumference 4a centered on the cast-out part 2 and on which an outer circumference 3a of a cast member 3, which will be described later, can come into contact; A wedge hole 5 is formed on the opposite side of the protrusion 4.

Further, the cast member 3 that is cast into the opening of the auxiliary chamber is made of mild steel and has an annular shape, as shown in FIG.

Then, as shown in FIG. 1, the cast member 3
The outer circumference 3 a of the cast member 3 is brought into contact with the inner circumference 4 a of the protrusion 4 , and the wedge 6 is pushed into the wedge hole 5 while slidingly contacting the outer circumference 3 a of the cast member 3 . It is clamped and fixed between the circumference 4a and the wedge 6.

In this way, the cast member 3 can be positioned horizontally by the protrusion 4, and the protrusion 4
The cast member 3 can be fixed with the wedges 6, and the cast member 3 can be set at a predetermined position in the mold with an extremely easy configuration.

Although this embodiment shows a mold structure for casting a cast member into the opening of the auxiliary chamber of the cylinder head, the present invention is not limited to this, and for example, the mold structure is It can also be applied to a mold structure that is cast into an opening.

(Effects of the invention) As explained in detail above, the invention has an extremely simple structure because the cast member is fixed in the mold using the arc-shaped convex part centered on the cast-out part and the wedge. , the casting member can be easily set at an accurate position within the mold.

Therefore, it is possible to provide a casting in which the cast member is cast in an accurate position, and the quality can be improved.

Furthermore, since the casting parts are easy to set, there is no need for setting jigs or special preparation work.
It also has the effect of improving productivity by allowing assembly work to be carried out within the casting line.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an example of the mold structure of the present invention, Fig. 2 shows the structure of the lower mold used in Fig. 1, Fig. 2 a is a plan view thereof, and Fig. 2 b 3 is a longitudinal sectional view, FIG. 3 shows the cast member used in FIG. 1, FIG. 3a is a plan view thereof, and FIG. 3b is a longitudinal sectional view. DESCRIPTION OF SYMBOLS 1... Lower mold, 2... Casting part, 3... Casting member, 3a... Outer periphery, 4... Convex part, 4a... Inner periphery, 5... Wedge hole, 6... Wedge.

Claims (1)

[Scope of utility model registration request] forming an arc-shaped convex part centered on the cast-out part provided in the lower mold in the lower mold, further forming a wedge hole on the side opposite to the convex part with respect to the cast-out part, The outer circumference of the annular cast member is brought into contact with the inner circumference of the convex portion, and the wedge is pushed into the wedge hole while slidingly contacting the outer circumference of the cast member, thereby placing the cast member in a predetermined position in the mold. A mold structure for a cylinder head casting member, which is characterized by being fixed in position.