Core box assembly for manufacturing drilling-free sand core and obtained sand core
By setting up air needle inserts and soluble vanishing die plugs in the core box assembly, the problems of breakage of oil path sand core during drilling and water-based coating infiltration are solved, and the manufacturing and efficient discharge of drill-free sand cores are achieved. The formation of gas channels reduces the sand core waste rate and improves the iron pouring effect.
Patent Information
- Application Number
- CN202420861103.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-24
AI Technical Summary
In the prior art, oil-channel sand cores are prone to break during drilling, resulting in a high waste rate of sand cores, and water-based coatings may penetrate into the sand core, affecting the effect of molten iron pouring.
Design a core box assembly, including an upper core box, a lower core box and a vanishing mold plug, set up a protruding air needle insert to form a ventilation hole, and use a soluble vanishing mold plug to seal and melt to form an exhaust passage to avoid Drilling and water-based coating seepage.
The sand core manufacturing is achieved without drilling, which reduces the fracture rate of the sand core, and forms an exhaust passage through high-temperature melting and disappearing die plugs, ensuring that the sand core is ventilated during drying, improving the integrity of the sand core and molten iron pouring Effect.
Smart Images
Figure CN222268606U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sand core manufacturing, in particular to a core box component used for sand core manufacturing and the obtained sand core. Background Art
[0002] Please combine Figures 1 to 3 As shown in the figure, the sand core of the casting product is formed by curing the sand core with resin. The oil channel core has a complex shape, is locally thin, and has low strength. At the same time, in order to prevent the molten iron from penetrating into the sand core during the pouring process, the surface of the sand core needs to be dipped in water-based paint, such as Figure 2 The figure shows the sand core after dipping in water-based paint. After dipping in water-based paint, the paint is dried. In order to better exhaust the sand core during the molten iron pouring process, it is necessary to drill holes in the sand core after dipping and drying. Figure 3 As shown, the sand core has a hole 1' drilled on the side near the bottom for exhaust. Since the oil channel sand core structure is relatively fragile, about 30% of the oil channel cores will break during the drilling process, resulting in a high amount of sand core waste.
[0003] Therefore, a new technical solution is needed to solve the above problems. Utility Model Content
[0004] In order to solve the problems generated by the prior art, the utility model provides a core box assembly for manufacturing drilling-free sand cores.
[0005] In order to achieve the above-mentioned purpose, the core box assembly for manufacturing the drilling-free sand core of the utility model can adopt the following technical solutions:
[0006] A core box assembly for manufacturing drill-free sand cores comprises an upper core box, a lower core box and a lost foam plug; a protruding gas needle insert is provided in the upper core box or the lower core box at a position where the sand core needs to be opened; the size of the gas needle insert is the same as that of the lost foam plug.
[0007] Furthermore, the lost foam plug is cylindrical or truncated cone-shaped with a narrow upper portion and a wide lower portion.
[0008] Furthermore, the lost foam plug is made of soluble material.
[0009] Beneficial effects: Compared with the prior art, the core box assembly provided by the utility model can form an air vent inside the sand core formed by the core box by providing a protruding air needle insert, and provides a lost foam plug that can be filled in the air vent to form a seal for the air vent, so that when the sand core is dipped in water-based paint, the water-based paint will not enter the interior of the sand core through the air vent, and when the water-based paint is dried at high temperature, the lost foam plug melts and disappears due to the high temperature, so that the air vent forms an exhaust channel after drying.
[0010] The utility model also provides a technical solution for the sand core obtained from the core box assembly: the sand core forms a vent hole at the position of the air needle insert, and the lost foam plug is inserted into the vent hole to form a seal for the vent hole.
[0011] Furthermore, the outer surface of the sand core is coated with a water-based coating. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 Schematic diagram of a sand core formed by a core box but not punched in the prior art;
[0013] Figure 2 for Figure 1 Schematic diagram of the sand core after being dipped in water-based coating;
[0014] Figure 3 This is a schematic diagram of the prior art for drilling air holes in a dried sand core;
[0015] Figure 4 This is a structural diagram of the lower core box of the utility model;
[0016] Figure 5 This is a schematic diagram of forming vent holes in a formed sand core by using an air needle insert in the present invention.
[0017] Figure 6 This is a schematic diagram of the sand core vent hole being sealed by the lost foam plug in the utility model.
[0018] Figure 7 for Figure 6 Schematic diagram of the medium sand core after dipping into water-based coating;
[0019] Figure 8 It is a three-dimensional diagram of the lost foam plug in the utility model. DETAILED DESCRIPTION
[0020] The present invention is further illustrated below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the following specific implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.
[0021] See also Figure 4 As shown, the utility model discloses a core box assembly for manufacturing a drilling-free sand core, comprising an upper core box, a lower core box and a lost foam plug. A protruding gas needle insert is provided in the upper core box or the lower core box at the position where the sand core needs to be opened. In this embodiment, as Figure 4As shown, the air needle insert 2 protrudes from the lower core box 1. The position of the air needle insert is the position where the sand core needs a vent hole. When the sand core is formed in the core box, the position of the air needle insert forms a vent hole as an exhaust channel for the sand core. Figure 4 and Figure 8 As shown, the size of the provided air needle insert 2 is the same as that of the lost foam plug 3. Since the size of the lost foam plug 3 is the same as that of the air needle insert 2, after the vent hole is formed on the sand core 4, the lost foam plug 3 can be filled in the vent hole 5 to form a seal for the vent hole 5, which can be combined with Figure 5 、 Figure 6 As shown, the lost foam plug 3 is cylindrical or truncated cone-shaped with a narrow upper portion and a wide lower portion.
[0022] As a conventional technique, EPC plugs are made of a soluble material that melts and disappears at high temperatures. Therefore, after the vents 5 formed in the sand core 4 are sealed by the EPC plugs 3, the outer surface of the sand core 4 is coated with a water-based coating. The water-based coating then dries at high temperatures, causing the EPC plugs 3 to melt and disappear in the high-temperature environment, exposing the vents 5 and resulting in the finished sand core.
Claims
1. A core box assembly for manufacturing a drilling-free sand core, characterized in that: It comprises an upper core box, a lower core box and a lost foam plug; a protruding gas needle insert is arranged at a position where the sand core needs to be opened in the upper core box or the lower core box; the size of the gas needle insert is the same as that of the lost foam plug.
2. The core box assembly according to claim 1, characterized in that: The lost foam plug is cylindrical or truncated cone shaped with a narrow top and a wide bottom.
3. The core box assembly according to claim 1 or 2, characterized in that: The lost foam plug is made of soluble material.
4. A sand core prepared according to the core box assembly according to any one of claims 1 to 3, characterized in that: The sand core forms an air vent at the position of the air needle insert, and the lost foam plug is inserted into the air vent to form a seal for the air vent.
5. The sand core according to claim 4, characterized in that: The outer surface of the sand core is coated with a water-based paint.