Investment casting runner feeding structure
By designing the annular main cavity, side cavity and retractable structure in the investment casting runner, the distribution and shape of the main channel and inner runner are optimized, the shrinkage problem during casting process is solved, the process of removing water outlets is simplified, and the process of improving the Productivity.
Patent Information
- Application Number
- CN202420937637.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-30
AI Technical Summary
During the casting process, the mold of the sidewall structure is prone to shrinkage holes, and the prior art solves it by adding an inner flow channel, but it leads to the complicated mold and the process of removing the water outlet.
Design an investment casting runner retracting structure, including an annular main cavity, side cavity and retracting structure, the distribution and shape of the main channel and the inner channel are optimized to ensure that the metal liquid flows fully and avoid shrinkage holes, while After casting is completed, it is easy to remove the inner runner.
It effectively avoids the shrinkage problem, simplifies the casting process and subsequent water outlet removal process, and improves production efficiency.
Smart Images
Figure CN222242519U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of casting molds, in particular to a flow channel shrinkage compensation structure for investment casting. Background Art
[0002] During the casting process, different mold designs are required for different products. For castings with side wall structures, shrinkage cavities are easily formed at the side brackets, which in turn affects the quality of the cast products. In the prior art, for example, Figure 1 As shown, in order to avoid this situation, multiple internal runners are used. However, when the number of internal runners increases, the entire mold will become more complicated. At the same time, after the casting is completed, the process of removing the water nozzle will also become more complicated. Utility Model Content
[0003] Based on this, it is necessary to provide a flow channel shrinkage compensation structure for investment casting to address the problems in the prior art.
[0004] A shrinkage compensation structure for investment casting runners, characterized in that it includes a gate, a plurality of main runners are connected to the lower side of the gate, the lower side of the main runners is a product cavity, the product cavity includes a main cavity and a side cavity, the main cavity is annular, the side cavity is a side support arranged on the outside of the annular main cavity, the main cavity is provided with a shrinkage compensation structure at the connection position with the side cavity, the shrinkage compensation structure is a protruding portion arranged on the annular inner wall of the main cavity.
[0005] In one embodiment, the feeding structure is annular and distributed on the inner wall of the main cavity.
[0006] In one of the embodiments, an inner flow channel is further provided between the main flow channel and the product cavity, and the inner flow channel is located outside the main cavity near one side of the side bracket.
[0007] In one embodiment, the connection between the inner flow channel and the main cavity is one quarter of the top side area of the main cavity.
[0008] In one embodiment, the cross section of the inner flow channel is an inverted cone, and the width of the connection between the inner flow channel and the main cavity is smaller than the width of the connection between the inner flow channel and the main flow channel.
[0009] In one embodiment, the compensation structure is a contact surface between the main cavity and the inner flow channel extending to the connection position of the side bracket.
[0010] In one embodiment, the lower side between the feeding structure and the inner side surface of the main cavity is an inclined surface, and the acute angle formed between the inclined surface and the inner side surface of the main cavity is 30°-45°.
[0011] In one embodiment, three main channels are provided and are evenly distributed at the lower side of the gate. A liquid storage cavity is provided at the connection between the main channel and the inner channel. The liquid storage cavity is a cube. The area of the cube on the side in contact with the main channel and the inner gate is larger than the corresponding cross-sectional area of the main channel and the inner gate.
[0012] The above-mentioned investment casting runner shrinkage compensation structure arranges the main channel for feeding the product cavity and the shrinkage compensation structure at the upper side of the product cavity, and the shrinkage compensation structure is the main cavity at the connection position with the side cavity, which can ensure the amount of liquid metal during the casting process. At the same time, it can also avoid the occurrence of shrinkage holes in the product during the casting process. At the same time, it is convenient to remove the sprue after production, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the investment casting structure in the prior art;
[0014] Figure 2 This is a schematic diagram of the overall structure of the investment casting runner shrinkage compensation structure of the utility model;
[0015] Figure 3 It is a schematic diagram of the product cavity and inner flow channel structure of the investment casting flow channel feeding structure of the utility model;
[0016] Figure 4 It is a schematic diagram of the cross-sectional view of the product cavity and inner flow channel of the investment casting flow channel feeding structure of the utility model;
[0017] Among them, 1. gate; 2. main flow channel; 21. inner flow channel; 22. liquid storage cavity; 31. main cavity; 32. side bracket; 4. shrinkage compensation structure. DETAILED DESCRIPTION
[0018] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0019] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only."
[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0021] like Figures 2 to 4 As shown, a shrinkage compensation structure of an investment casting runner is characterized in that it includes a gate 1, a plurality of main channels 2 are connected to the lower side of the gate 1, the lower side of the main channels 2 is a product cavity, the product cavity includes a main cavity 31 and a side cavity, the main cavity 31 is annular, the side cavity is a side bracket 32 arranged on the outside of the annular main cavity 31, the main cavity 31 is provided with a shrinkage compensation structure 4 at the connection position with the side cavity, and the shrinkage compensation structure 4 is a protruding portion arranged on the annular inner wall of the main cavity 31.
[0022] At this time, the product shrinkage compensation structure 4 is arranged at the annular inner wall position of the main cavity 31 of the product cavity, and is connected to the side cavity.
[0023] At this time, in order to facilitate the flow of molten metal at the position of the feeding structure 4 during casting, in the present embodiment, the feeding structure 4 is annular and distributed on the inner wall of the main cavity 31. The annular feeding structure 4 can be connected with a plurality of side brackets 32, so that during the casting process, it is equivalent to providing the feeding structure 4 at each different angle position.
[0024] In order to facilitate the separation of the main channel 2 from the product after the processing is completed, in the present embodiment, an inner channel 21 is further provided between the main channel 2 and the product cavity, and the inner channel 21 is located outside the main cavity 31 close to the side bracket 32. Furthermore, the connection between the inner channel 21 and the main cavity 31 is one quarter of the top side area of the main cavity 31, so that the molten metal can fully enter the main cavity. At the same time, since the contact area between the inner channel 21 and the main cavity is small, the inner channel 21 can be quickly removed after the production is completed.
[0025] After the casting is completed, in order to facilitate the removal of the inner flow channel 21, in this embodiment, the cross section of the inner flow channel 21 is an inverted cone, and the width of the connection between the inner flow channel 21 and the main cavity 31 is smaller than the width of the connection between the inner flow channel 21 and the main channel 2. The inverted cone of the cross section of the inner flow channel 21 can ensure the flow rate of the molten metal entering the main cavity 31. At the same time, after the casting is completed, the connection area between the inner flow channel 21 and the product (formed after the main cavity 31 is cast) is small, and after the casting is completed, the workload of removing the water inlet formed by the inner flow channel 21 is less.
[0026] The purpose of the feeding structure 4 is to avoid shrinkage holes on the product. At the same time, it is also necessary to ensure that a certain amount of molten metal can be maintained after the molten metal is immersed in the position of the side bracket 32. Therefore, in this embodiment, the feeding structure 4 is a contact surface between the main cavity 31 and the inner flow channel 21 extending to the connection position of the side bracket 32.
[0027] At this time, there is a certain height difference between the inner wall of the feeding structure 4 and the inner wall of the main cavity 31. In order to avoid shrinkage cavities during the production process, in this embodiment, the lower side between the feeding structure 4 and the inner side surface of the main cavity 31 is an inclined surface, and the acute angle formed between the inclined surface and the inner side surface of the main cavity 31 is 30°-45°. Specifically, in this embodiment, the acute angle formed between the inclined surface and the inner side surface of the main cavity 31 is 40°. After the inclined surface is set, there is a slow transition from the inner side surface of the feeding structure 4 to the inner side surface of the main cavity 31, so as to avoid the problem of shrinkage cavities caused by the vertical transition between the inner side surface of the feeding structure 4 and the inner side surface of the main cavity 31, which may form a heat node.
[0028] At the same time, in order to improve production efficiency, the investment casting mold in this embodiment is provided with multiple product cavities. Specifically, the main channel 2 is provided with three, evenly distributed at the lower side of the gate 1, and a liquid storage cavity 22 is provided at the connection between the main channel 2 and the inner channel 21. The liquid storage cavity 22 is a cube, and the area of the cube on the side in contact with the main channel 2 and the inner gate 1 is larger than the corresponding cross-sectional area of the main channel 2 and the inner gate 1. By providing multiple main channels 2 and corresponding product cavities, multiple products can be produced at the same time, thereby improving production efficiency to a certain extent. At the same time, a cubic liquid storage cavity 22 is provided at the connection position between the main channel 2 and the inner channel 21 to increase the flow rate of the molten metal immersed in the inner channel 21, and avoid the problem of vacuum holes at the connection position between the main channel 2 and the inner channel 21.
[0029] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0030] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. An investment casting runner feeding structure, characterized in that: It includes a gate, a plurality of main channels are connected to the lower side of the gate, the lower side of the main channels is a product cavity, the product cavity includes a main cavity and a side cavity, the main cavity is annular, the side cavity is a side support arranged on the outside of the annular main cavity, the main cavity is provided with a shrinkage compensation structure at the connection position with the side cavity, and the shrinkage compensation structure is a protruding part arranged on the annular inner wall of the main cavity.
2. The investment casting runner feeding structure according to claim 1, characterized in that: The feeding structure is annular and distributed on the inner wall of the main cavity.
3. The investment casting runner feeding structure according to claim 2, characterized in that: An inner flow channel is also provided between the main flow channel and the product cavity, and the inner flow channel is located outside the main cavity body close to one side of the side bracket.
4. The investment casting runner feeding structure according to claim 3, characterized in that: The connection between the inner flow channel and the main cavity is one quarter of the area of the top side surface of the main cavity.
5. The investment casting runner feeding structure according to claim 4, characterized in that: The cross section of the inner flow channel is an inverted cone, and the width of the connection between the inner flow channel and the main cavity is smaller than the width of the connection between the inner flow channel and the main flow channel.
6. The investment casting runner feeding structure according to claim 5, characterized in that: The shrinkage compensation structure extends from the contact surface between the main cavity and the inner flow channel to the connection position of the side bracket.
7. The investment casting runner feeding structure according to claim 6, characterized in that: The lower side between the feeding structure and the inner side surface of the main cavity is an inclined surface, and the acute angle formed between the inclined surface and the inner side surface of the main cavity is 30°-45°.
8. The investment casting runner feeding structure according to claim 2, characterized in that: There are three main channels, which are evenly distributed at the lower side of the gate. A liquid storage cavity is provided at the connection between the main channel and the inner channel. The liquid storage cavity is a cube. The area of the cube on the side in contact with the main channel and the inner gate is larger than the corresponding cross-sectional area of the main channel and the inner gate.