JPH11244995A - Method for adhering lost wax pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method which obtains sufficient adhering strength and good working efficiency without needing a large scaled device, by laying sprues in a lost wax pattern in a recessed part arranged on a runner plate, pouring molten wax into the recessed part and solidifying and adhering, at the time of executing the adhering work, with which the lost wax pattern in a lost wax precision casting method is combined with the runner plate through the sprue. SOLUTION: At the time of adhering the wax pattern 1 to the runner plate 2 through the sprues 4 in the case of needing many sprues 4 in a large scale casting product, the recessed part 6 having about 0.5-3.0 mm depth, is beforehand arranged at the positions of the sprue parts to be adhered to the runner plate 2. After setting the sprues 4 in the wax pattern 1 into the recessed part 6 so that the recessed surface becomes the horizontal plane, the molten wax 3 is poured, solidified and adhered. In this way, since the large scaled device is not needed and the good working efficiency and such sufficient adhering strength as to resist the stress loaded to the wax adhering part at the time of manufacturing a mold in the following process can be obtd., the precision casting product having high reliability can be obtd. at the low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonding method for assembling a vanishing model (also referred to as a wax model) used in a lost wax precision casting method into a runner.

[0002]

2. Description of the Related Art Lost wax precision casting is a so-called near-net process that is close to the final part shape in terms of the flexibility of the product shape, the high dimensional accuracy, and the selection range of applicable materials. This manufacturing method has been established as a shape processing process. In recent years, the variety of materials such as titanium alloys, magnesium alloys, and composite materials with refractories has been increasing, and product shapes have also been increasing in size and complexity.

[0003] In such a situation, the assembling operation of bonding the wax model of the lost wax precision casting method to the runner portion through the gate is performed by using an electric iron, a gas torch and a heating plate. Melt one place at a time
It is common to adhere to the runner. Also,
A method has also been used in which a sprue bonding portion of a wax model is immersed in a wax melting tank in which wax is melted, and then bonded to a runner portion before it hardens.

A special method is disclosed in Japanese Patent Application Laid-Open No. 60-83.
No. 739, a method of joining using a vinyl chloride tube to the spout of a wax model fitted to a runner, Japanese Patent Application Laid-Open No. 60-154849, embedding a nut structure in a runner and a bolt structure in a wax model part, A method of joining with a nut mechanism and a method of integrally molding with a runner mold using a pre-molded wax model disclosed in JP-A-63-194839 are disclosed. there were.

[0005] However, as the size of the product increases, the number of places where wax is attached increases, the area of the attachment portion increases, and the strength of the bonding portion becomes insufficient. In addition, in a product having a lot of gates, there is a problem that an incompletely adhered portion is generated, manual correction is required, and the number of work steps is increased. Further, when the method of immersing the sprue bonding part in the wax melting tank is employed, the cost is increased due to an increase in the size of the equipment, and the problem of insufficient bonding strength is not solved.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in bonding a wax model of a large product to a runner, and to solve the problem in the next step, that is, at the time of making a wax bonding part at the time of mold production. To provide a method of bonding a wax model having sufficient bonding strength to withstand the stress applied to,
An object of the present invention is to provide a method of bonding a wax model which does not require upsizing of equipment and has high working efficiency.

[0007]

The present inventor has arrived at a means for pouring and adhering molten wax during various studies to solve the above-mentioned problems.

Specifically, the present invention relates to a bonding operation for assembling a vanishable model of a lost wax precision casting method to a runner plate through a gate, placing the vane of the vanishable model in a recess provided in the runner plate, This is a method of bonding a fugitive model, characterized by pouring molten wax into a hollow portion and solidifying and bonding.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, an important feature of the present invention is that a large precision cast product having a large number of gates is used for bonding a wax model to a runner plate through a gate. ,
A recess having a depth of about 0.5 mm to 3.0 mm is provided in advance at a gate portion to be bonded to the runner plate, and a wax model gate is set in the recess so that the recess surface is horizontal. A molten wax is poured into the recess to solidify and adhere.

In this case, the depth of the recess may not be the same depending on the length of the gate. Further, the size of the depression is determined by the ease of pouring, and may be provided with a runner plate outer edge at the maximum. Also,
Although the runner of the present invention is described in the form of a plate, it is apparent that a recess such as a rod or a disk can be provided, and the shape does not matter as long as the molten wax can be poured.

[0011] The type of the molten wax is not limited,
From the viewpoint of the strength after bonding and the uniformity of the thermal expansion, it is desirable that the wax model is the same as the wax model, and further it is desirable that the wax model has an adhesive property.

According to the above-mentioned bonding method, the strength of a large-sized precision casting having a large number of gates after wax model bonding is increased, and the efficiency at the time of bonding can be improved. In the above description, it is limited to products having a large number of gates, but if it is intended to improve the adhesive strength and work efficiency, for example, when bonding many products at the same time, Applicable.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to an embodiment and drawings. A wax model of a product having an area of 250 mm × 250 mm, a height of 80 mm and 35 gates was molded. In addition, a runner plate having a depression was formed at a location where the gate was attached to the wax model. Next, the spout of the wax model was placed in the recess of the runner plate such that the recess was horizontal, and molten wax was poured to solidify and adhere.
In addition, the sprue cup was attached and the wax model assembly was completed (hereinafter referred to as a tree). FIG. 1 shows a schematic diagram of the pouring operation. FIG. 2 shows a main cross section of the tree.

The depth of the recess of the runner plate used above was 1.5 mm. The molten wax used was obtained by mixing and melting 20% of the adhesive wax in the wax used for the wax model. In the present embodiment, the number of work steps is reduced by 45% because there is no work to correct the runner plate and the gate section as compared with the conventional wax model bonding method. This work efficiency depends on the shape of the target product and the number of gates, but has been found to be clearly improved.

Then, after the tree was washed and dried, a mold manufacturing operation called a coating operation was performed. In the coating operation, after the tree is immersed in the slurry-like refractory housed in the container to coat the slurry, the step of coating the refractory particles using the sanding device is repeated about 6 to 7 times. There was no damage to the tree due to insufficient adhesive strength of the wax model.

[0016]

As described above, by using the method for bonding a fugitive model according to the present invention, even a large product having a large number of wax attachment points has sufficient bonding strength, and
Since the work efficiency is good, a highly reliable precision cast product can be obtained at a low cost, and this is an invention that produces a great effect industrially.

[Brief description of the drawings]

FIG. 1 is a schematic view of a pouring operation according to the present invention.

FIG. 2 is a diagram showing a main cross section of a tree according to the present invention.

[Brief description of reference numerals]

1. Wax model 2. Runner plate 3. Molten wax
4. Yuguchi 5. Gate cup 6 Hollow

Claims (1)

[Claims] In a bonding operation for assembling a vanishable model of a lost wax precision casting method to a runner plate through a sprue, the vane of the vanishable model is placed in a recess provided in the runner plate and melted in the recess. A method for bonding a fugitive model, which comprises solidifying and bonding by pouring wax.