KR20160067234A

KR20160067234A - Investment wax mold

Info

Publication number: KR20160067234A
Application number: KR1020140171832A
Authority: KR
Inventors: 안상욱; 김두식; 한원섭; 최상구; 장인성; 김정수
Original assignee: 청보산업(주)
Priority date: 2014-12-03
Filing date: 2014-12-03
Publication date: 2016-06-14

Abstract

The present invention invention relates to a mold for easily separating between a wax model and a runner in the ejection of the wax model in precise casting, wherein a structure of the mold is for ejecting a wax model for precise casting, has a space forming a wax model by wax injected to be connected with a branch runner branched from a main runner into which wax is injected, and has a model unit including a gate to be separated vertically. The mold comprises a block part for separating between the wax model and the runner provided inside the lower mold at the separation site of the short side of the branched runner connected to the gate of the molding part, and therefore, when a release pin of the molding part is elevated by a cylinder module provided at the rear surface side of the lower mold, after the upper mold is opened, the branched runner and the wax model including the gate are simultaneously separated and the wax solidified in the branched runner is separated and cut from the branched runner. In the procedure of obtaining the wax model, which corresponds to a previous step of the precise casting work as investment casting, the wax model, which is injected into the mold by filling and then solidified, is extracted from the mold, and at the same time, the connection portion between the wax model and the runner connected to the wax model is cut, thereby eliminating the need of the separation of the runner and the finishing of the separation surface, which have been necessarily performed after the ejection of the wax model, and obtaining a completed wax model with high dimensional precision.

Description

[0001] The present invention relates to a mold for easy separation between a wax model and a molten metal during injection molding of a wax model in precision casting.

The present invention relates to a wax model mold, and more particularly, to a wax model mold that facilitates separation between a wax model and a molten metal when a wax model used for casting a piece to be cast in a precision casting is injected.

One of the casting methods, the precision casting method (Investment casting method, Lost Wax method), is known as a casting method which is mainly used for manufacturing precise shaped products.

Casting by this precision casting method is one of the oldest metal forming processes known to have been used for the first time to produce detailed handicrafts from metals such as copper, bronze and gold.

A commonly known precision casting method will be described. First, a wax model having the same shape as the product to be manufactured is manufactured.

Generally, the wax model is manufactured by injecting the reactive wax into the injection mold, and the injection wax model is assembled into the wax tree to increase the production efficiency.

The assembly type can be determined depending on the size of the product, etc., and can be changed according to the shape of the wax model.

On the other hand, the wax tree prepared as above is mixed with water, alcohol and colloidal silica so that the viscosity of the ceramic powder is maintained, and the mixture is immersed in a stirred slurry for a predetermined period of time. Sprayed and then sufficiently dried.

After the coating operation is completed, the mold of the ceramic cell is heated at high temperature and high pressure to dissolve and remove the wax model, so that it can be manufactured inside the ceramic cell This process is referred to as dewaxing.

A molten metal (molten metal) is injected into a mold which has been subjected to a long-time sintering treatment at a high temperature in order to completely remove the wax and impurities remaining in the mold, and then the molten metal After each product is separated from each other, the surface of the product is polished, and the product is inspected for dimensions and appearance, and a finished product is obtained.

Here, the wax model is manufactured by separating the wax model after the injection of the wax, which injects the wax into an injection mold (hereinafter, referred to as a mold), and the liquid wax is injected into the mold. Since the wax is kept in the solid body even in the mold having the tundish and wax model, the wax model and the wax model are connected while the wax model is taken out from the mold.

As described above, there is a problem that the worker has to perform the manual operation for separating the hot water from the wax model after the hot water and the wax model are connected and the work time is delayed.

Also, after separating the wax model and the bathtub as described above, it is pointed out that there is a problem that the operation time and the work efficiency are greatly reduced since the operation of finishing the separated face is accompanied by incidental accompaniment.

In addition, when the wax model is damaged in the process of separating the wax from the wax model as described above, when the wax model is damaged, the dimension of the wax model is changed during the precise casting, And the dimensional accuracy of the substrate is greatly deteriorated.

Korean Patent Laid-Open No. 2001-0016008 (published on Mar. 05, 2001)

In order to solve the above-mentioned problem, the present invention provides a method of manufacturing a wax model corresponding to a pre-stage of an investment casting process, comprising the steps of: So that it is not necessary to separate the separating and separating surfaces of the bath which was necessary after the extraction of the wax model, so that the finished wax model having high dimensional accuracy can be obtained without any subsequent processing The goal is to be able to obtain.

According to an aspect of the present invention,

A wax model for precision casting is injected, and a model portion including a gate having a space for forming a wax pattern by the injected wax is connected to a branch bath branched from a main bath to which wax is injected. In the mold structure,

And a cut-off portion for separating the wax model and the molten metal from the molten metal to the inner side of the lower mold at the end of the branch pipe connected to the gate of the model portion. The mold unit after the upper mold opening is provided at the rear side of the lower mold The wax model including the gate and the branch bath are separated at the same time when the demolding pin rises and are separated and separated from the solidified wax in the branch bath.

According to the present invention, in the process of obtaining the wax model corresponding to the previous stage of the precision casting work process as the investment casting, the solidified wax model is injected into the mold to extract the wax model from the mold, It is possible to obtain a finished wax model having a high dimensional accuracy while eliminating the need for separating and separating the hot water which has been accompanied by the necessary withdrawal of the wax model.

Fig. 1 is an exploded perspective view showing the upper and lower molds in a state in which a mold to which the present invention is applied is separated. Fig.
Fig. 2 shows only the lower mold according to the present invention. Specifically, Fig. 2 is an enlarged view
Fig. 3 is a plan view showing the lower mold of Fig. 2 and an enlarged view
Fig. 4 is a cross-sectional view taken along the line AA in Fig. 3,
5 is a schematic view showing a state in which wax is injected into a mold
Fig. 6 is a cross-sectional view of the mold when the wax is injected into the mold
Fig. 7 is a schematic view showing a state in which the upper structure is opened in the mold according to Fig. 6
8 is a schematic cross-sectional view showing a state in which the demoulding pins are elevated from the rear side of the model portion constituting each wax model by the operation of the cylinder module on the rear side of the lower mold after the upper mold is opened by FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of the term in order to describe its invention in the best way Accordingly, the present invention should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the specification of the present invention and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. It should be understood that various equivalents and modifications are possible or possible.

The present invention provides a mold for making a wax model to be applied to precision casting as described above.

By the mold, when the wax model which is solidified after the liquid wax is injected into the mold, the connection portion between the wax and the wax model is automatically cut.

As shown in the accompanying drawings, a wax injection port 131 for injecting wax is provided at one side of a mold 100 for manufacturing a wax model composed of an upper mold 110 and a lower mold 120, And the breeze 130 is composed of a main breeze 132 and a breeze 133. The main breeze 132 and the breeze 133,

The main bath 132 is a main passage through which the wax is injected through the wax inlet 131. The branch bath 133 is connected to the main bath 132 and branched into a plurality of branches And a space constituting the model unit 140 for forming a wax model is formed at the end of the branch bath 133.

The mold part 140 is for solidifying the injected wax to form a wax pattern. A gate 141 connected to the branch bath 133 is provided at one side of the mold part 140, The wax flowing from the wax 132 is filled in the gate 141 through the branch flow 133 and has a flow path for filling the space of the model unit 140.

Blocking portions 150 and 150 'for separating the branch pipe 133 and the gate 141 are formed on the upper mold 110 and the lower mold 120. The blocking portions 150 and 150' ), Respectively.

When the upper mold 110 and the lower mold 120 are closed by the blocking unit 150, leakage of the liquid wax can be prevented except for the model unit 140 including the gate 141. [

Reference numeral 150 denotes a blocking portion of the lower mold, and reference numeral 150 'denotes a blocking portion of the upper mold.

Meanwhile, the blocking portions 150 and 150 'are engaged with each other by the upper and lower dies 110 and 120 to maintain the hermeticity. The blocking portion 150' of the upper mold 110 maintains the closed state, The blocking portion 150 of the mold 120 is configured to puncture the wax injection passage 151 for injecting the liquid wax along the branch bath 133.

Typically, the mold for forming the wax model has a configuration in which the wax is injected through the upper and lower molds into the cavity, that is, the mold part when the upper mold and the lower mold are closed.

As such, since the wax tree is injected into the mold part side through the upper and lower mold sides, and the solid body of the wax tree connected with the wax model is demolded together with the mold, (150.150 ') does not exist.

However, in the present invention, the wax tree is not formed but only the wax model is demolded, so that the blocking portion 150 'of the upper mold 110 and the blocking portion 150 of the lower mold 120 are engaged with each other, A wax injection passage 151 is formed only on the blocking portion 150 side of the lower mold 120 so that the wax flows into the gate 141 and the model portion 140 side.

When the wax is injected from the outside through the wax receiving inlet 131 in the state where the upper mold 110 and the lower mold 120 are closed as described above, the wax is filled with the main bath 132, And then the gate 141 and the model unit 140 are filled.

When the mold unit 140 and the gate 141 are both filled and then cured, the upper mold 110 is opened and the lower mold 120 is lifted up by the cylinder module 200 to the rear side of the lower mold 120. [ The demoulding process is performed by pushing the model unit 140 by the demoulding pin 210.

The wax injection passage 151 penetrates through the cutout 150 of the lower mold 120 among the cutouts 150 and 150 '. In this case, The outer circumferential surface of the cylinder block 200 is formed with a relatively sharp cutting edge 152 so that the deforming pin 210 due to the upward movement of the cylinder module 200 is filled in the model portion 140 and the gate 141, The wax injection passage 151 of the cut-off portion 150 is cut and cut in a state where the solidified wax is solidified.

As the demolding process proceeds, the connecting portion between the branch duct 133 and the gate 141 is cut and cut by the cutting edge 152 of the inner peripheral surface of the wax injection passage 151, The wax pattern formed by the wax pattern 140 is subjected to a demolding process.

After passing through the above-described process, the model part 140 including the demarcated gate 141 is transported to the discharge tray side after being dropped by the transport conveyor provided separately, and is collected by the operator, and then can be moved to a post-process.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Various modifications and changes may be made.

Accordingly, it is to be understood that the technical idea of the present invention is to be understood by the following claims, and all of its equivalents or equivalents fall within the technical scope of the present invention.

100; Mold 110; Upper mold
120; A lower mold 130; Tangdo
131; A wax inlet 132; Main Tangdo
133; Branching 140; Model part
141; Gates 150 and 150 '; Blocking portion
151; Wax injection path

Claims

A wax model for precise casting is injected and connected to a branch bath 133 branched from a main bath 132 connected to a wax injection port 131 into which a wax is injected, In the structure of the molds 110 and 120 having the model part 140 including the gate 141 and having the space therebetween,
A blocking unit 150 or 150 for separating the wax model and the branching bath 133 from the lower mold 120 at the end side separating point of the branching bath 133 connected to the gate 141 of the model unit 140 The mold part 140 is provided on the rear side of the lower mold 120 after the upper mold 110 is opened so that the gate 141 is opened when the demoulding pin 210 is lifted by the cylinder module 200 The wax model including the wax model and the bifurcated casting 133 are separated at the same time and separated from the wax solidified in the bifurcated casting 133. [ Mold for easy separation of the liver.

The method according to claim 1,
The blocking portion 150 of the upper mold 110 maintains the closed state and the blocking portion 150 of the lower metal mold 120 has the wax injection passage for the liquid wax to be injected along the branch bath 133. [ (151) is perforated, which is easy to separate between the wax model and the molten metal during the injection of the wax model in the precision casting.

3. The method of claim 2,
Wherein the inner peripheral surface of the wax injection passage (151) is formed by a cutting edge (152). The mold is easy to separate between the wax model and the molten metal during the injection of the wax model in the precision casting.