Precision investment casting wax mold device
By designing positioning grooves and wax flow channels in the wax model device, the problems of low bonding strength and dimensional accuracy of wax models were solved, realizing the preparation of wax models with accurate wax core positioning and high bonding strength, thus improving production efficiency and wax model accuracy.
Patent Information
- Application Number
- CN202520082891.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-14
AI Technical Summary
In the existing technology, when making wax molds for thick products, the bonding strength between liquid wax and cold wax core is low. After cooling, the outer layer and cold wax core are prone to delamination, causing the wax mold to bulge. In addition, the wax core is not installed in an accurate position, affecting dimensional accuracy.
The mold design adopts a positioning groove on the inner wall of the wax core cavity. The inner contour of the wax core cavity is the same as that of the wax model cavity. The wax core cavity is equipped with a positioning protrusion. The wax liquid flow channel connects the wax core cavity and the wax model cavity, ensuring accurate positioning of the wax core in the wax model cavity. The wax liquid flow channel design improves the bonding strength.
It improves the bonding strength between the wax core and the outer wax mold, avoids separation and bulging, ensures the consistency and accuracy of the wax mold dimensions, and improves production efficiency.
Smart Images
Figure CN223762083U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of investment casting technology, and more specifically to an investment casting wax model device. Background Technology
[0002] Investment casting is a method in which a wax pattern is coated with refractory material, the wax is removed from the pattern to form a shell, the shell is then fired at high temperature, and molten steel is poured in to obtain a casting.
[0003] In existing technologies, when making wax models of thick products, a cold wax core is typically prepared first. This cold wax core is then fixed inside the wax model cavity using a positioning device, ensuring it is centered within the cavity and has a gap between it and the cavity wall. This allows the wax injected into the cavity to completely encapsulate the cold wax core, forming the wax model upon cooling. However, during the process, the large temperature difference between the liquid wax injected into the mold and the cold wax core results in low bonding strength. Upon cooling, this can lead to delamination between the outer layer and the cold wax core, causing defects such as wax model bulging. Furthermore, the positioning device cannot guarantee the accuracy of the cold wax core's placement, thus compromising the dimensional precision of the wax model. Utility Model Content
[0004] In view of this, the present invention aims to provide a wax model device for precision casting of investment molds to at least partially solve the problems in the prior art, such as low bonding strength between the liquid wax injected into the mold and the cold wax core, and the wax model swelling caused by the outer layer separating from the cold wax core after cooling, which cannot guarantee the dimensional accuracy of the wax model.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A wax pattern casting device for investment casting includes a mold. A wax core cavity and a wax model cavity are spaced apart within the mold. Multiple positioning grooves are formed on the inner wall of the wax core cavity to form a wax core with positioning protrusions. The inner contours of the wax core cavity and the wax model cavity are identical, allowing the formed wax core to be placed within the wax model cavity, with the top of the positioning protrusions abutting against the inner wall of the wax model cavity. A wax flow channel is formed within the mold, with one end extending through the side wall of the mold and the other end connecting to both the wax core cavity and the wax model cavity.
[0007] The beneficial effects that this invention can achieve are as follows: This device can be used to prepare wax cores with positioning protrusions. After the wax core is removed from the wax core cavity, it can be transferred into the wax model cavity. By injecting wax, another wax core and a balustrade wax model with the wax core inside can be obtained. This device can simultaneously produce wax cores and balustrade wax models with the wax core inside, which is highly efficient. The wax core is installed and positioned accurately and conveniently, with good dimensional consistency and high precision. At the same time, the positioning protrusions on the surface of the wax core improve the bonding strength with the outer wax model, avoiding the phenomenon of separation and bulging between the cold wax core and the surface of the outer wax model.
[0008] Preferably, there are multiple wax core cavities and wax model cavities, all of which are connected by wax liquid flow channels.
[0009] Preferably, the mold includes an upper mold and a lower mold that can be interlocked. The interlocking surfaces of the upper mold and the lower mold are mirror-arranged with a wax core groove, a wax model groove and a wax flow channel groove, so that the upper mold and the lower mold interlock to form the wax core cavity, the wax model cavity and the wax flow channel.
[0010] Preferably, the positioning groove includes a plurality of first grooves and a plurality of second grooves, the first grooves being formed on the inner sidewall of the wax core groove and extending through the fastening surface of the upper or lower mold, and the second grooves being formed on the inner bottom wall of the wax core groove.
[0011] Preferably, the first groove is a tapered groove whose inner diameter gradually decreases in the direction away from the wax core groove.
[0012] Preferably, the second groove is a tapered groove whose inner diameter gradually decreases in the direction away from the wax core groove.
[0013] Preferably, the wax flow channel includes a main flow channel, a first branch flow channel, and a second branch flow channel. One end of the main flow channel extends through the side wall of the upper or lower mold. One end of the first branch flow channel is connected to the other end of the main flow channel, and the other end is connected to the wax core channel. One end of the second branch flow channel is connected to the other end of the main flow channel, and the other end is connected to the wax model channel.
[0014] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a wax pattern device for investment casting, which has the following beneficial effects:
[0015] 1. The thick-structured wax model obtained by using the wax core prepared by this device has a high bonding strength between the outer layer and the wax core, and there is no surface separation or bulging phenomenon.
[0016] 2. The produced wax cores are of consistent size, and the wax cores are easy to position and install in the wax model cavity, ensuring the consistency and high precision of the produced wax model size.
[0017] 3. The wax core and wax model are made in the same mold, which facilitates wax injection and improves production efficiency. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0019] Figure 1 A schematic diagram of a wax pattern device for precision casting of investment casting provided by this utility model.
[0020] Figure 2 A schematic diagram of the structure of a wax core produced by a wax pattern device for investment casting provided by this utility model.
[0021] Figure 3 This is a schematic diagram of the structure of a wax pattern device for precision casting of investment casting with a wax core placed in it.
[0022] Figure 4 A schematic diagram of the structure of a balustrade wax model produced by a precision casting wax model device for investment casting provided by this utility model.
[0023] In the diagram: 1. Upper mold, 2. Lower mold, 3. Wax core groove, 31. Positioning groove, 311. First groove, 312. Second groove, 4. Wax model groove, 5. Wax flow channel groove, 51. Main flow channel groove, 52. First branch flow channel groove, 53. Second branch flow channel groove, 6. Wax core, 61. Positioning protrusion, 7. Balustrade wax model. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0027] Please see Figures 1-3 This utility model discloses a wax model device for precision casting of wax molds, including a mold. The mold has a wax core cavity and a wax model cavity spaced apart. The inner wall of the wax core cavity has a plurality of positioning grooves 31 so as to obtain a wax core 6 with positioning protrusions 61 through the wax core cavity. The inner contours of the wax core cavity and the wax model cavity are the same so that the obtained wax core 6 is placed in the wax model cavity and the top of the positioning protrusions 61 abuts against the inner wall of the wax model cavity. The mold has a wax flow channel, one end of which is arranged through the side wall of the mold, and the other end is connected to the wax core cavity and the wax model cavity respectively.
[0028] This device can be used to prepare a wax core 6 with positioning protrusions 61 by wax injection. After the wax core 6 is removed from the wax core cavity, it can be placed in the wax model cavity. Continuing to inject wax can produce another wax core 6 and a balustrade wax model with the wax core 6 inside. This device can simultaneously produce the wax core 6 and the balustrade wax model with the wax core 6 inside, which is highly efficient. The wax core 6 is easy to install and position, has good dimensional consistency, and high precision. Furthermore, the positioning protrusions 61 on the surface of the wax core 6 improve the bonding strength with the outer wax model and avoid the phenomenon of separation and bulging between the cold wax core and the surface of the outer wax model.
[0029] In one specific embodiment, there are multiple wax core cavities and wax model cavities, all of which are connected through wax liquid flow channels.
[0030] In one specific embodiment, the mold includes an upper mold 1 and a lower mold 2 that can be interlocked. The interlocking surfaces of the upper mold 1 and the lower mold 2 are mirror-arranged with a wax core groove 3, a wax model groove 4, and a wax liquid flow channel groove 5, so that the upper mold 1 and the lower mold 2 can be interlocked to form a wax core cavity, a wax model cavity, and a wax liquid flow channel.
[0031] In one specific embodiment, the positioning groove 31 includes a plurality of first grooves 311 and a plurality of second grooves 312. The first grooves 311 are formed on the inner sidewall of the wax core groove 3 and are arranged through the fastening surface of the upper mold 1 or the lower mold 2. The second grooves 312 are formed on the inner bottom wall of the wax core groove 3. Through the first grooves 311 and the second grooves 312, a plurality of positioning protrusions 61 are evenly distributed around the prepared wax core 6. When the wax core 6 is placed in the wax model cavity 4, a gap is left between the body of the wax core 6 and the inner wall of the wax model cavity through the positioning protrusions 61, so that the wax liquid can fully cover the body of the wax core 6.
[0032] In one specific embodiment, the first groove 311 is a conical groove with an inner diameter that gradually decreases in the direction away from the wax core groove 3. After the upper mold 1 and the lower mold 2 are engaged, the first groove 311 on them are engaged to form a complete conical groove, which facilitates demolding after the wax core 6 is prepared.
[0033] In one specific embodiment, the second groove 312 is a tapered groove with an inner diameter that gradually decreases in the direction away from the wax core groove 3, which facilitates demolding after the wax core 6 is prepared.
[0034] In one specific embodiment, the wax flow channel 5 includes a main flow channel 51, a first branch flow channel 52, and a second branch flow channel 53. One end of the main flow channel 51 is connected to the side wall of the upper mold 1 or the lower mold 2. One end of the first branch flow channel 52 is connected to the other end of the main flow channel 51, and the other end is connected to the wax core 6. One end of the second branch flow channel 53 is connected to the other end of the main flow channel 51, and the other end is connected to the wax model 6. The wax injected through the main flow channel 51 can simultaneously enter the wax core cavity and the wax model cavity, thus simultaneously preparing the wax core 6 and the wax model, improving production efficiency.
[0035] A method for preparing a wax model using the investment casting precision wax model apparatus of this invention includes the following steps:
[0036] First, the upper mold 1 and lower mold 2 are fastened together using a molding device. Molten wax is then injected into the wax core cavity and wax model cavity through the wax flow channel. After the wax solidifies, the mold is opened to remove the first wax core 6 and wax model. Figures 1-2 Place the prepared wax core 6 into the wax model cavity, ensuring that the positioning protrusion 61 on the wax core 6 abuts against the inner wall of the wax model cavity, see [link to relevant documentation]. Figure 3 ; Press the upper mold 1 and lower mold 2 together again, continue injecting wax, and after solidification, open the mold again to obtain the second wax core 6 and the balustrade wax model 7 containing the first wax core 6. See [link / reference]. Figure 4 Then place the second wax core 6 into the wax model cavity, repeat the wax injection, and obtain the next wax core 6 and the panel wax model 7. Repeat the above steps.
[0037] The wax molds for the parapets prepared using this device have high production efficiency, good formability, high strength, and high precision.
[0038] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.
[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An investment precision casting wax pattern apparatus, characterized by, The mold comprises a wax core cavity and a wax model cavity, a plurality of positioning grooves (31) are arranged on the inner wall of the wax core cavity, and a wax core (6) with positioning protrusions (61) is prepared by the wax core cavity; the wax core cavity and the wax model cavity have the same inner contour, so that the prepared wax core (6) is placed in the wax model cavity, and the top end of the positioning protrusion (61) abuts against the inner wall of the wax model cavity; a wax liquid flow channel is arranged in the mold, one end of the wax liquid flow channel penetrates through the side wall of the mold, and the other end of the wax liquid flow channel communicates with the wax core cavity and the wax model cavity respectively.
2. A lost-wax precision investment casting wax pattern apparatus as defined in claim 1, wherein, The wax core cavity and the wax model cavity are both multiple and are communicated by the wax liquid flow channel.
3. A lost-wax precision investment casting wax pattern apparatus as defined in claim 1, wherein, The mold comprises an upper mold (1) and a lower mold (2) which can be buckled to each other, the buckling surface of the upper mold (1) and the lower mold (2) is mirror-imaged with a wax core groove (3), a wax model groove (4) and a wax liquid flow channel groove (5), so that the upper mold (1) and the lower mold (2) are buckled to form the wax core cavity, the wax model cavity and the wax liquid flow channel.
4. A lost-wax precision investment casting wax pattern apparatus as defined in claim 3 wherein, The positioning grooves (31) comprise a plurality of first grooves (311) and a plurality of second grooves (312), the first grooves (311) are arranged on the inner side wall of the wax core groove (3) and penetrate through the buckling surface of the upper mold (1) or the lower mold (2), and the second grooves (312) are arranged on the bottom wall of the wax core groove (3).
5. A lost-wax precision investment casting wax pattern apparatus as defined in claim 4, wherein, The first grooves (311) are tapered grooves with gradually decreasing inner diameters away from the wax core groove (3).
6. A lost-wax precision investment casting wax pattern apparatus as defined in claim 4, wherein, The second grooves (312) are tapered grooves with gradually decreasing inner diameters away from the wax core groove (3).
7. A lost-wax precision investment casting wax pattern apparatus as defined in claim 3 wherein, The wax liquid flow channel groove (5) comprises a main flow channel groove (51), a first branch flow channel groove (52) and a second branch flow channel groove (53), one end of the main flow channel groove (51) penetrates through the side wall of the upper mold (1) or the lower mold (2), one end of the first branch flow channel groove (52) communicates with the other end of the main flow channel groove (51), and the other end of the first branch flow channel groove (52) communicates with the wax core groove (3), one end of the second branch flow channel groove (53) communicates with the other end of the main flow channel groove (51), and the other end of the second branch flow channel groove (53) communicates with the wax model groove (4).