Composite ceramic riser tube for high-pressure casting

Abstract

The utility model relates to the technical field of aluminum melt high-pressure casting accessories, and aims to provide a composite ceramic riser tube for high-pressure casting, which comprises a ceramic body, the ceramic body is of a stepped conical structure, and a hollow aluminum flowing structure is arranged in the ceramic body; the upper end of the ceramic body is of a big-end-up frustum structure, and the periphery is wrapped with a metal shell. A sealing gasket is arranged on the upper surface of the metal shell, and a flow guide groove is formed in the upper surface of the sealing gasket; the bottom of the ceramic body is provided with a flow inlet, and the top is provided with a flow outlet and a bolt hole. The device has the characteristics of simple structure, good aluminum non-sticking performance, stable aluminum liquid flow velocity, convenience in installation and use and the like, and can be widely applied to the technical field of high-pressure casting of aluminum and aluminum alloy melts.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum melt high-pressure casting accessories, in particular to a composite ceramic liquid riser for high-pressure casting. Background Art

[0002] Riser tube is a key component widely used in the field of aluminum and aluminum alloy melt casting. It realizes the lifting of molten aluminum from the smelting equipment into the mold cavity for casting through pressure. It is an important component affecting the continuous production of aluminum and aluminum alloy casting. The aluminum and aluminum alloy casting process often requires the riser tube to have excellent thermal shock resistance, non-stick aluminum performance, high temperature resistance and resistance to aluminum liquid corrosion. It is widely used in both low-pressure casting and high-pressure casting.

[0003] At present, riser tubes are mainly divided into metal and ceramic materials. Metal riser tubes have good air tightness, but poor oxidation resistance and aluminum liquid corrosion resistance, produce more impurities and adhesion scaling, and have a short service life. Ceramic riser tubes mainly include silicon carbide, silicon nitride, fused quartz and aluminum titanate ceramics, which have relatively good oxidation resistance and corrosion resistance, but low strength and high apparent porosity, which directly affect thermal vibration resistance and air tightness, and have a service life longer than metal riser tubes. In low-pressure casting, riser tubes are widely used, mainly made of silicon carbide, silicon nitride or aluminum titanate. For example, patent application No. "201310464370.6" introduces a silicon nitride composite ceramic riser tube for low-pressure casting. The silicon nitride raw material is processed into submicron ultrafine and the silicon nitride riser tube obtained by gas pressure sintering has a porosity of ≤0.5%, which has higher strength and air tightness than conventional ceramic riser tubes, and has excellent thermal vibration resistance, excellent oxidation resistance and corrosion resistance, and anti-adhesion scaling and other excellent properties; while in high-pressure casting (referred to as die casting), the riser tube needs to be buried in the aluminum liquid for a long time, and because the casting needs to be quantitatively designed, the structure of the riser tube is significantly different from the large-diameter straight-through structure of low-pressure casting. Providing a riser tube that does not stick to aluminum, is suitable for long-term use in aluminum liquid, is easy to install and position, and has a stable aluminum liquid flow rate can meet the special needs of high-pressure casting and has broad market prospects. Summary of the invention

[0004] The utility model aims to provide a composite ceramic riser for high pressure casting, which has the characteristics of simple structure, good non-stick aluminum performance, stable aluminum liquid flow rate and convenient installation and use, and can be widely used in the field of aluminum and aluminum alloy melt high pressure casting technology.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme to implement it: a composite ceramic riser tube for high-pressure casting, including a ceramic body, which has a stepped conical structure and a hollow flow aluminum structure inside; the upper end of the ceramic body has a large upper and small lower cone structure, and is wrapped with a metal shell on the outside; a sealing gasket is provided on the upper surface of the metal shell, and a guide groove is provided on the upper surface of the sealing gasket; an inlet is provided at the bottom of the ceramic body, and an outlet and a bolt hole are provided at the top.

[0006] As an improvement, the bottom of the ceramic body is provided with an inclined cone structure on the outside, and the bottom is provided with an inclined mouth and a straight cylinder structure on the inside.

[0007] As an improvement, the angle between the inclined cone structure and the horizontal direction is 30°~60°, and the angle between the inclined section and the straight section of the inclined-mouth plus straight-tube structure is 120°~160°.

[0008] As an improvement, the metal shell is closely attached to the frustum structure at the upper end of the ceramic body, and a right-angle turning structure is provided at the large circle at the upper end.

[0009] As an improvement, the surface of the metal shell is provided with circular holes, and there are four circular holes in total, which correspond to the bolt holes one by one.

[0010] As an improvement, the sealing gasket is a hollow structure with two circles of the same concentricity.

[0011] As an improvement, the sealing gasket is made of aluminum silicate ceramic fiber and has a thickness of 8 to 12 mm.

[0012] As an improvement, the guide trough has a U-shaped cross-section, with a base at the bottom and two fixing circular holes on the base. The nuts are passed through the fixing circular holes and then tightened in the bolt holes, thereby fixing the guide trough.

[0013] As an improvement, the diameter of the inlet is smaller than the diameter of the outlet.

[0014] As an improvement, the ceramic body is made of one of silicon carbide castables or aluminum titanate ceramic materials, and both the inner and outer surfaces are provided with a non-stick aluminum coating.

[0015] The beneficial effects of the utility model include: a composite ceramic riser tube for high-pressure casting, which has the characteristics of simple structure, good non-stick aluminum performance, stable aluminum liquid flow rate, and easy installation and use. By adopting a composite structure in which a metal shell is used to wrap the ceramic body, the risk of damage caused by collision when connected to a quantitative furnace is reduced, and the installation strength of the ceramic riser tube is improved; the bolt holes arranged on the top of the ceramic body are convenient for fixing with the guide groove, and the sealing gasket in the middle plays a role of buffer connection and sealing to prevent leakage of pressurized gas in the quantitative furnace, which causes the casting pressure to be too low and the product to be unqualified; by adopting a small-mouth inlet and large-mouth outlet for aluminum liquid, the excessive flow rate of aluminum liquid under high pressure can be avoided to cause tumbling and slag formation; in addition, by adopting silicon carbide castable or aluminum titanate ceramic material for the ceramic body, the aluminum liquid corrosion resistance of the riser tube is improved, and the non-stick aluminum layer on the inner and outer surfaces further prolongs the service life of the riser tube, and the internal inclined mouth and straight tube structure is adopted to improve the aluminum liquid reflux speed and avoid aluminum hanging inside the riser tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the composite ceramic riser tube for high pressure casting of the utility model;

[0017] Figure 2 This is a front view of the metal shell of the composite ceramic riser tube for high pressure casting of the utility model;

[0018] Figure 3 This is a front view of the composite ceramic riser pipe sealing gasket for high pressure casting of the utility model;

[0019] Figure 4 The utility model is a schematic diagram of the structure of the composite ceramic riser pipe guide trough for high pressure casting.

[0020] In the figure: 1. Ceramic body; 2. Hollow flow aluminum structure; 3. Metal shell; 4. Sealing gasket; 5. Guide groove; 6. Inlet; 7. Outlet; 8. Bolt hole; 9. Bevel cone structure; 10. Bevel plus straight cylinder structure; 11. Right-angle turn structure; 12. Round hole; 13. Fixed round hole; 14. Bevel; 15. Chamfered corners; 16. Prefabricated round hole. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 As shown, the utility model is a composite ceramic riser tube for high-pressure casting, comprising a ceramic body 1, which is in a stepped conical structure and is provided with a hollow flow aluminum structure 2 inside; the upper end of the ceramic body 1 is in a frustum structure with a large upper part and a small lower part, and is wrapped with a metal shell 3 on the periphery; a sealing gasket 4 is provided on the upper surface of the metal shell 3, and a guide groove 5 is provided on the upper surface of the sealing gasket 4; an inlet 6 is provided at the bottom of the ceramic body 1, and an outlet 7 and a bolt hole 8 are provided at the top.

[0022] Furthermore, a beveled cone structure 9 is provided on the outside of the bottom of the ceramic body 1, and a beveled straight tube structure 10 is provided on the inside of the bottom; specifically, the beveled cone structure 9 has an angle of 30°~60° with the horizontal direction, preferably 45°~55°, and the angle between the beveled section and the straight tube section of the beveled straight tube structure is 120°~160°, preferably 135°~150°, thereby increasing the reflux speed of the aluminum liquid and avoiding aluminum hanging inside, which leads to frequent cleaning and damage to the internal protective layer.

[0023] Furthermore, the metal shell 3 is in close contact with the frustum structure at the upper end of the ceramic body, and a right-angle turning structure 11 is provided at the upper end of the large circle; specifically, Figure 2 As shown, the surface of the metal shell 3 is provided with a circular hole 12, and the circular holes 12 are provided with four in total, and correspond one to one with the bolt holes 8; specifically, the size of the circular hole 12 is φ10~φ14mm, the size of the bolt hole 8 is M8~M12mm, and the circular hole 12 and the bolt hole 8 are evenly distributed along the circumference, so as to facilitate the fixing of the guide groove 5.

[0024] Furthermore, if Figure 3 As shown, the sealing gasket 4 is a hollow structure with two circles of the same concentricity; specifically, the sealing gasket 4 is made of aluminum silicate ceramic fiber and has a thickness of 8-12 mm, preferably 10 mm; more specifically, the sealing gasket 4 is provided with two prefabricated circular holes 16, which are convenient for the nut on the guide groove to pass through the sealing gasket 4 for compression and sealing, and the two prefabricated circular holes 16 correspond to the positions of the circular holes adjacent to the surface of the metal shell 3 and have equal diameters.

[0025] Furthermore, the guide groove 5 is provided with two fixing circular holes 13, through which nuts are passed through the circular holes 13 and then tightened in the bolt holes, so as to fix the guide groove 5; specifically, the fixing circular holes 13 correspond to the positions of the prefabricated circular holes on the sealing gasket 4; more specifically, as Figure 4 As shown, the guide groove 5 is in a U-shaped structure and is made of high-strength stainless steel. An inclined surface 14 and a rounded corner 15 are provided inside the guide groove 5 to facilitate cleaning of residual aluminum liquid inside the guide groove 5.

[0026] Furthermore, the diameter of the inlet 6 is smaller than the diameter of the outlet 7; specifically, the diameter of the inlet 6 is φ20~φ50mm, and the diameter of the outlet 7 is φ70~φ100mm; a small-inlet and large-outlet aluminum liquid outlet method is adopted to avoid excessive aluminum liquid flow rate under high pressure to cause tumbling and slag formation, which affects the physical and chemical properties of the casting.

[0027] Furthermore, the ceramic body 1 is made of one of silicon carbide castable material or aluminum titanate ceramic material, preferably silicon carbide castable material, and both the inner and outer surfaces are provided with a non-stick aluminum coating, thereby improving the riser tube's resistance to aluminum liquid corrosion, and the non-stick aluminum layer on the inner and outer surfaces further extends the riser tube's service life.

[0028] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A composite ceramic riser tube for high pressure casting, comprising a ceramic body (1), characterized in that: The ceramic body (1) is in a stepped conical structure, and a hollow aluminum flow structure (2) is provided inside; the upper end of the ceramic body (1) is in a frustum structure with a large top and a small bottom, and is surrounded by a metal shell (3); a sealing gasket (4) is provided on the upper surface of the metal shell (3), and a guide groove (5) is provided on the upper surface of the sealing gasket (4); an inlet (6) is provided at the bottom of the ceramic body (1), and an outlet (7) and a bolt hole (8) are provided at the top.

2. The composite ceramic riser tube for high pressure casting according to claim 1, characterized in that: The bottom of the ceramic body (1) is provided with an inclined cone structure (9) on the outside, and an inclined straight cylinder structure (10) on the inside.

3. The composite ceramic riser tube for high pressure casting according to claim 2, characterized in that: The angle between the inclined cone structure (9) and the horizontal direction is 30° to 60°, and the angle between the inclined section and the straight section of the inclined-mouth plus straight-tube structure (10) is 120° to 160°.

4. The composite ceramic riser tube for high pressure casting according to claim 1, characterized in that: The metal shell (3) is closely attached to the frustum structure at the upper end of the ceramic body (1), and a right-angle turning structure (11) is provided at the large circle at the upper end.

5. The composite ceramic riser tube for high pressure casting according to claim 4, characterized in that: The surface of the metal shell (3) is provided with circular holes (12), and there are four circular holes (12) in total, which correspond one to one with the bolt holes (8).

6. The composite ceramic riser tube for high pressure casting according to claim 1, characterized in that: The sealing gasket (4) is a hollow structure with two circles having the same concentricity.

7. The composite ceramic riser tube for high pressure casting according to claim 6, characterized in that: The sealing gasket (4) is made of aluminum silicate ceramic fiber and has a thickness of 8 to 12 mm.

8. The composite ceramic riser tube for high pressure casting according to claim 1, characterized in that: The guide groove (5) has a U-shaped cross-section, a base is provided at the bottom, and two fixing circular holes (13) are provided on the base. Nuts are passed through the fixing circular holes (13) and then tightened in the bolt holes, thereby fixing the guide groove (5).

9. The composite ceramic riser tube for high pressure casting according to claim 1, characterized in that: The diameter of the inlet (6) is smaller than the diameter of the outlet (7).

10. The composite ceramic riser tube for high pressure casting according to claim 1, characterized in that: The ceramic body (1) is made of a silicon carbide castable or an aluminum titanate ceramic material, and both the inner and outer surfaces are provided with a non-stick aluminum coating.

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