Exothermic riser structure suitable for secondary ejection exhaust
By designing a heating riser structure suitable for secondary ejection exhaust, the existing heating riser exhaust problems are solved, and a more efficient casting process and a more stable riser structure are achieved.
Patent Information
- Application Number
- CN202420800177.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-17
AI Technical Summary
The existing heating risers have poor exhaust effect during casting, resulting in unsmooth casting filling and easily causing casting to be scrapped. At the same time, the traditional heating risers cannot be ejected using the core box structure, resulting in low production efficiency and easy cracking of the risers.
A heating riser structure suitable for secondary ejection exhaust is designed, including an outer shell and a blind hole. The blind hole is arranged in the middle of the top wall of the inner cavity. After the through hole is formed on the top, the external exhaust needle is connected to the exhaust needle to optimize the structure to facilitate sand injection and exhaust.
Through the design of secondary ejection exhaust, the exhaust efficiency during the casting process is improved, the problem of unsmooth casting filling is avoided, and the production process of the heating riser is optimized, production efficiency is improved, and the cracks are prevented.
Smart Images
Figure CN222588039U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat-insulating risers and exothermic risers, in particular to a exothermic riser structure suitable for secondary ejection and exhaust. Background Art
[0002] In recent years, the heat riser technology has been widely used in the foundry industry. The heat riser is a supplementary part attached to the top or side of the casting to avoid defects in the casting. The heat riser is made by adding a certain amount of thermite, flux, oxidant and the above-mentioned thermal insulation materials when making the riser. The heat generation also has the function of thermal insulation. During casting, the riser is quickly ignited and burned at about 680°C. The heat released at this time increases the temperature of the molten iron in the riser, prolongs the solidification time of the molten metal in the riser, prolongs the shrinkage compensation time, and improves the shrinkage compensation efficiency of the riser for the casting. The existing methods for making heat risers are often divided into two types. The first method is to wrap the riser in a sand shell, make the thickness of the sand shell outside the riser thin, and exhaust The second method is to stick the riser on the sand shell, with the sides and top of the riser exposed. The gas emission of the heating riser is much larger than that of the coated sand. A layer of sand shell is wrapped around the outside of the riser, and the exhaust effect is not good, which will also bring some adverse effects on casting production. Manually sticking the riser is difficult to operate and has low efficiency. When the heating riser burns, a large amount of gas emerges and cannot be discharged, causing the air pressure in the cavity to increase, which is not conducive to filling, especially for thin-walled parts. Unsmooth filling leads to scrapping of castings, etc. The traditional heating riser is too thick in the middle and cannot be ejected using the core box structure for secondary ejection. Because the force required to penetrate is large, cracks or risers will be ejected at other positions of the riser. For this reason, we propose a heating riser structure suitable for secondary ejection and exhaust. Utility Model Content
[0003] The technical problem to be solved by the utility model is to overcome the existing defects, provide a heating riser structure suitable for secondary ejection and exhaust, design and optimize the structure of the traditional heating riser, use the core making equipment mold opening ejection mechanism for secondary ejection during core making, and after the core making is completed, form a through hole on the top of the heating riser and connect an external exhaust needle for exhaust, which can effectively solve the problems in the background technology.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heat riser structure suitable for secondary ejection exhaust, comprising a shell and a blind hole;
[0005] Shell: a cavity is provided inside the shell;
[0006] Blind hole: It is set in the middle of the top wall of the inner cavity. The diameter of the blind hole is smaller than the diameter of the inner cavity. The design optimizes the structure of the traditional heating riser. When making the core, the core making equipment mold opening ejection mechanism is used for secondary ejection. After the core making is completed, a through hole is formed on the top of the heating riser and an external exhaust needle is connected for exhaust.
[0007] Furthermore, the inner wall of the inner cavity is an inclined inner wall that is thin at the top and thick at the bottom, which is convenient for subsequent sand-shooting work.
[0008] Furthermore, a groove is provided on the top wall of the blind hole to prevent cracks or risers from appearing at other positions.
[0009] Furthermore, the blind hole and the inner cavity are radially adjacent to each other, so that the subsequent ejection work is smoother.
[0010] Furthermore, the remaining wall thickness above the blind hole is -mm, which prevents sand from flowing into the riser during sand shooting.
[0011] Compared with the prior art, the utility model has the following beneficial effects: the heat riser structure suitable for secondary ejection exhaust has the following advantages:
[0012] When making a heat-generating riser, the ejector on the core box first probes into the inner cavity, and performs sandblasting on the inner cavity and the blind hole. The inclined inner wall with a thin top and a thick bottom facilitates the sandblasting work. After the sandblasting work is completed, the ejector is ejected upward again. When the ejector contacts the top wall of the blind hole, the top wall of the blind hole is slowly stressed. The remaining wall thickness above the blind hole is 3-5mm. The ejector can easily penetrate the top wall of the blind hole to form a through hole without too much force. A groove is provided on the top wall of the blind hole. When the ejector penetrates the top wall of the blind hole, the top wall of the blind hole can be completely broken along the groove to prevent cracks from being ejected from other positions of the riser. The structure of the traditional heat-generating riser is designed and optimized. When making the core, the core-making equipment mold ejection mechanism is used for secondary ejection. After the core is made, a through hole is formed on the top of the heat-generating riser and an external exhaust needle is connected for exhaust. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the structure of the utility model;
[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.
[0015] In the figure: 1 outer shell, 2 inner cavity, 3 blind hole, 4 groove. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0017] See also Figure 1-2 , This embodiment provides a technical solution: a heat riser structure suitable for secondary ejection exhaust, comprising a shell 1 and a blind hole 3;
[0018] Shell 1: An inner cavity 2 is provided inside the shell, and the inner wall of the inner cavity 2 is an inclined inner wall that is thin at the top and thick at the bottom, which is convenient for subsequent sandblasting work;
[0019] Blind hole 3: It is arranged in the middle of the top wall of the inner cavity 2. The diameter of the blind hole 3 is smaller than the diameter of the inner cavity 2. A groove 4 is opened on the top wall of the blind hole 3. The groove 4 is an annular groove. The groove 4 is distributed on the outer edge of the top wall of the blind hole 3 to prevent cracks or risers from being ejected at other positions. The blind hole 3 and the inner cavity 2 are radially adjacent to each other, so that the subsequent ejection work is smoother. The remaining wall thickness above the blind hole 3 is 3-5mm to prevent sand from flowing into the riser during sand shooting. The structure of the traditional heating riser is designed and optimized. When making the core, the core making equipment mold opening ejection mechanism is used for secondary ejection. After the core making is completed, a through hole is formed on the top of the heating riser and an external exhaust needle is connected for exhaust.
[0020] The working principle of a heating riser structure suitable for secondary ejection and exhaust provided by the utility model is as follows: when the heating riser is made, the ejector rod on the core box first probes into the inner cavity 2, and performs sandblasting on the inner cavity 2 and the blind hole 3. The inclined inner wall with a thin top and a thick bottom facilitates the sandblasting work. After the sandblasting work is completed, the ejector rod is ejected upward again. When the ejector rod contacts the top wall of the blind hole 3, the top wall of the blind hole 3 is slowly stressed. Since the remaining wall thickness above the blind hole 3 is 3-5mm, the ejector rod can easily penetrate the top wall of the blind hole 3 to form a through hole without too much force. Since a groove 4 is provided on the top wall of the blind hole 3, when the ejector rod penetrates the top wall of the blind hole 3, the top wall of the blind hole 3 can be completely broken along the groove 4 to prevent cracks from being ejected from other positions of the riser. The structure of the traditional heating riser is designed and optimized. When making the core, the core making equipment mold ejection mechanism is used for secondary ejection. After the core making is completed, a through hole is formed on the top of the heating riser and an external exhaust needle is connected for exhaust.
[0021] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A heat riser structure suitable for secondary ejection exhaust, characterized in that: It comprises a housing (1) and a blind hole (3); The housing (1) has an inner cavity (2) formed therein; Blind hole (3): It is arranged in the middle of the top wall of the inner cavity (2), and the diameter of the blind hole (3) is smaller than the diameter of the inner cavity (2).
2. A heat riser structure suitable for secondary ejection exhaust according to claim 1, characterized in that: The inner wall of the inner cavity (2) is an inclined inner wall that is thin at the top and thick at the bottom.
3. The heat-generating riser structure suitable for secondary ejection exhaust according to claim 1, characterized in that: A groove (4) is provided on the top wall of the blind hole (3).
4. The heat-generating riser structure suitable for secondary ejection exhaust according to claim 1, characterized in that: The blind hole (3) and the inner cavity (2) are radially adjacent to each other.
5. The heat-generating riser structure suitable for secondary ejection exhaust according to claim 1, characterized in that: The remaining wall thickness above the blind hole (3) is 3-5 mm.