Ultrasonic-assisted feeding head structure

Abstract

The invention belongs to the technical field of casting, and particularly relates to an ultrasonic-assisted feeding riser structure which comprises a riser sleeve, and a cavity for storing metal liquid is formed in an inner cavity of the riser sleeve. The ultrasonic receiving seat is arranged outside the riser bush, is configured to be in butt joint with an ultrasonic generating device and is used for transmitting ultrasonic waves to the riser bush; and the absorbing layer wraps the outer part of the riser sleeve. The ultrasonic feeder has the beneficial effects that vibration generated by the ultrasonic wave generating device can be conducted to the feeder sleeve through the ultrasonic receiving base, the ultrasonic effect is generated on metal liquid in the feeder sleeve, the feeding effect of the feeder can be effectively improved, and the conditions of shrinkage cavities and looseness of castings are avoided. The riser sleeve is wrapped with the absorbing layer, ultrasonic vibration can be absorbed by the absorbing layer, the effect of ultrasonic on the structure outside the riser sleeve is greatly weakened, then the adverse effect of ultrasonic vibration on a casting sand mold is avoided, and the sand mold shakeout condition is avoided.

Description

Technical Field

[0001] This application belongs to the field of casting technology, and particularly relates to an ultrasonic-assisted feeding riser structure. Background Art

[0002] During the casting process, the molten metal is poured into the mold and gradually cools and solidifies. Phase changes during the forming process cause the volume of the metal to shrink. If there is not enough molten metal to fill the voids generated by the volume shrinkage, shrinkage cavities and porosity will occur, affecting the quality of the casting and even leading to scrapping. This is especially serious for the thick and large parts of the casting.

[0003] The design of the riser can compensate for shrinkage cavities and porosity caused by the volume shrinkage of the metal during the phase change process, but the feeding capacity is limited. The existing riser feeding technologies still have difficulty meeting the production requirements of high-quality castings. Summary of the Invention

[0004] To solve the technical problem that the existing riser feeding technology has difficulty meeting the production requirements of high-quality castings, this application provides an ultrasonic-assisted feeding riser structure.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] An ultrasonic-assisted feeding riser structure, comprising

[0007] A riser sleeve, the inner cavity of which forms a cavity for storing molten metal;

[0008] An ultrasonic receiving seat, arranged outside the riser sleeve, configured to be docked with an ultrasonic generating device for conducting ultrasonic waves to the riser sleeve;

[0009] An absorption layer, wrapped outside the riser sleeve.

[0010] In some embodiments, the ultrasonic-assisted feeding riser further includes a housing, and the absorption layer is arranged inside the housing.

[0011] In some embodiments, the housing and the absorption layer are of a splicing structure.

[0012] In some embodiments, a storage part is arranged inside the riser sleeve, and the size of the storage part is larger than that of other parts of the riser sleeve.

[0013] In some embodiments, the top of the inner cavity of the storage part bulges upward to form a collection cavity, the cross-section of the collection cavity is in an inverted "V" shape, and the bottom of the collection cavity is connected to the inner wall of the upper part of the riser sleeve through a conical guiding surface.

[0014] In some embodiments, an electromagnetic coil is arranged outside the absorption layer, and the electromagnetic coil corresponds to the position of the storage part.

[0015] In some embodiments, the ultrasonic receiving seat includes a mounting portion and a conduction portion. The mounting portion is sleeved outside the riser sleeve. One end of the conduction portion extends above the riser sleeve and is connected to the mounting portion, and the other end is docked with the ultrasonic generating device.

[0016] In some embodiments, the upper part of the riser sleeve has a connecting portion, the connecting portion is conical, and the inner cavity of the mounting portion matches the conical structure of the connecting portion.

[0017] In some embodiments, the riser sleeve and the ultrasonic receiving seat are made of steel or ceramic materials.

[0018] In some embodiments, a pressure sleeve is arranged above the mounting portion. The pressure sleeve is sleeved outside the riser sleeve and abuts against the mounting portion.

[0019] In some embodiments, the material of the absorption layer is rock wool or aluminum silicate fiber cotton.

[0020] Beneficial effects: The present invention can use the ultrasonic receiving seat to conduct the vibration generated by the ultrasonic generating device to the riser sleeve, generate ultrasonic action on the molten metal in the riser sleeve, effectively improve the feeding effect of the riser, and avoid the occurrence of shrinkage cavities and porosity in the casting. An absorption layer is wrapped outside the riser sleeve, and the ultrasonic vibration will be absorbed by the absorption layer, greatly weakening the action of the ultrasonic on the structure outside the riser sleeve, thereby avoiding the adverse effect of the ultrasonic vibration on the casting sand mold and the situation of sand mold falling sand. Description of the Drawings

[0021] Figure 1 Schematic cross-sectional view of the riser structure without an electromagnetic coil

[0022] Figure 2 Schematic cross-sectional view of the riser structure with an electromagnetic coil;

[0023] Figure 3 Schematic cross-sectional view of the riser structure of another embodiment;

[0024] Figure 4 Schematic cross-sectional view of the riser structure with a collection cavity;

[0025] In the figure, 1. Riser sleeve, 11. Storage portion, 12. Connecting portion, 13. Collection cavity, 14. Conical guiding surface, 2. Absorption layer, 3. Ultrasonic receiving seat, 31. Mounting portion, 32. Conduction portion, 33. Pressure sleeve, 4. Shell, 5. Electromagnetic coil. Detailed Embodiments

[0026] The present application will be further described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without making creative changes belong to the protection scope of the present application.

[0027] During the casting process, ultrasonic or mechanical vibration is used to assist in reducing shrinkage porosity in the casting. However, ultrasonic or mechanical vibration usually acts directly on the casting sand mold, which will have a negative impact on the casting sand mold and cause the casting sand mold to become loose or damaged, instead increasing the scrap rate.

[0028] The technical solution adopted by the present invention will be introduced below in conjunction with the accompanying drawings. As Figures 1 to 4 shown, an ultrasonic-assisted feeding riser structure includes a riser sleeve 1, the inner cavity of which forms a cavity for storing molten metal; an ultrasonic receiving seat 3 is arranged outside the riser sleeve 1 and is configured to be docked with an ultrasonic generating device for conducting ultrasonic waves to the riser sleeve 1; an absorption layer 2 is wrapped outside the riser sleeve 1.

[0029] During the casting process, the inventive riser structure is applied to the riser position of the sand mold gating system. The ultrasonic generating device conducts ultrasonic waves to the riser sleeve 1 through the ultrasonic receiving seat 3. During casting, the ultrasonic waves act on the molten metal inside the riser sleeve 1 and at the bottom of the riser structure, generating a cavitation effect, promoting the discharge of gas and dross therein, increasing the fluidity of the molten metal at the riser, increasing the stirring and diffusion effect, improving the feeding capacity of the riser, and avoiding the gradual generation of shrinkage porosity and looseness. At the same time, the absorption layer 2 is coated outside the riser sleeve 1, which can absorb ultrasonic waves, play a buffering role, weaken the effect of ultrasonic waves on the sand mold, and reduce the problems of sand mold loosening and sand dropping caused by the impact on the sand mold, thereby improving the quality of the casting. The absorption layer 2 can also play a heat preservation role, avoiding the problem that the molten metal in the riser sleeve 1 is prone to premature cooling and solidification, resulting in the failure of the riser feeding. The above solution can arrange the ultrasonic generating device outside the sand mold through the ultrasonic receiving seat 3, introduce ultrasonic waves into the riser position, with accurate action position, and at the same time reduce the damage to the sand mold itself.

[0030] The riser sleeve 1 and the ultrasonic receiving seat 3 should be made of materials conducive to ultrasonic wave conduction, preferably steel or ceramic materials. Among them, the ceramic material can be corundum. The material of the absorption layer 2 should be a porous material, preferably rock wool or aluminosilicate fiber cotton, which not only has a heat preservation function but also can effectively absorb ultrasonic waves and weaken the ability of ultrasonic waves to conduct to the housing 4 and the sand mold.

[0031] In order to improve the stability of the riser structure, in this embodiment, the ultrasonic-assisted feeding riser further includes a housing 4, and the absorption layer 2 is disposed inside the housing 4. The housing 4 and the riser sleeve 1 can clamp the absorption layer 2 therebetween, facilitating the installation of the riser structure. Specifically, preferably, the housing 4 and the absorption layer 2 are fixed, such as by bolts or adhesives.

[0032] In this embodiment, the housing 4 and the absorption layer 2 are of a splicing structure. Specifically, the housing 4 and the absorption layer 2 are respectively axially divided into two petal structures. The two petals can be joined to wrap around the outside of the riser sleeve 1, and after joining, they can be fixed with bolts to form an integral body. After the riser sleeve 1 is damaged, the riser sleeve 1 can be directly replaced, while the housing 4 and the absorption layer 2 can be reused, saving costs.

[0033] As Figures 1 to 4 shown, in order to reduce the overall size of the inner cavity of the riser structure without affecting the feeding ability of the riser structure, in this embodiment, a storage portion 11 is provided in the riser sleeve 1, and the size of the storage portion 11 is larger than that of other parts of the riser sleeve 1. As shown in the figure, in this embodiment, the storage portion 11 is provided in the middle part of the riser sleeve 1, and the storage portion 11 is in a spherical structure, which can store molten metal to meet the feeding requirements, while reducing the size of other parts of the riser sleeve 1, especially the size of the upper part of the storage portion 11, reducing the overall size of the riser inner cavity, which is beneficial to reducing the loss of raw materials.

[0034] As Figure 4 shown, since the size of the storage portion 11 is larger than that of other parts of the riser, gases, dross, etc. generated during the casting process are likely to accumulate in the storage portion 11, especially in the case where there are steps in the cavity of the storage portion 11. For example, in another embodiment, the storage portion 11 is a relatively large cylinder, and the upper part of the riser sleeve 1 is a relatively small cylinder structure. A table is formed at the transition connection between the storage portion 11 and the upper part of the riser sleeve 1, and gases, dross, etc. are likely to accumulate there and cannot be smoothly discharged from the upper part of the riser sleeve 1. In this embodiment, a collection cavity 13 is formed by upward protrusion at the top of the inner cavity of the storage portion 11, and the cross-section of the collection cavity 13 is in an inverted "V" shape. The bottom of the collection cavity 13 is connected to the inner wall of the upper part of the riser sleeve 1 through a conical guiding surface 14. The floating gases, dross, etc. generated when the ultrasonic acts on the molten metal are collected in the collection cavity 13 or discharged from the upper part of the riser sleeve 1 along the conical guiding surface 14, avoiding the retention of gases, dross, etc. in the main part of the storage portion 11 and avoiding affecting the casting.

[0035] In order to prevent the molten metal in the riser sleeve 1 from solidifying prior to the casting and improve the feeding effect, as Figures 2 to 4As shown, in this embodiment, an electromagnetic coil 5 is disposed outside the absorption layer 2, and the electromagnetic coil 5 corresponds to the storage part 11 in position. The electromagnetic coil 5 can be used to heat the molten metal in the riser sleeve 1 to control its temperature, maintain the liquid state, and improve the feeding effect. Specifically, a receiving cavity for installing the electromagnetic coil 5 is formed in a corresponding part outside the absorption layer 2, and the electromagnetic coil 5 is disposed in the receiving cavity. In the solution where the housing 4 and the absorption layer 2 are of a splicing structure, the absorption layer 2 can be first spliced and wrapped outside the riser sleeve 1, then the electromagnetic coil 5 is installed in the receiving cavity, and then the housing 4 is spliced and included outside the absorption layer 2. The electromagnetic coil 5 does not contact the riser sleeve 1, and the two are separated by the absorption layer 2. On the one hand, it avoids the impact of the ultrasonic wave conducted by the riser sleeve 1 on the electromagnetic coil 5, and on the other hand, the absorption layer 2 can effectively reduce the temperature conducted from the riser sleeve 1 to the electromagnetic coil 5, avoiding adverse effects of high temperature on the electromagnetic coil 5 during the casting process.

[0036] For the convenience of installing the ultrasonic receiving seat, specifically, as Figures 1 to 4 shown, in some embodiments, the ultrasonic receiving seat 3 includes a mounting part 31 and a conduction part 32. The mounting part 31 is sleeved outside the riser sleeve 1. One end of the conduction part 32 extends above the riser sleeve 1 and is connected to the mounting part 31, and the other end is docked with the ultrasonic generating device. The mounting part 31 is arranged in an annular structure and is thus sleeved on the riser sleeve 1 to contact the riser sleeve 1 to conduct ultrasonic waves. The conduction part 32 is integrally provided with the mounting part 31, or can also be designed in a split manner with the bottom surface of the conduction part 32 closely attached to the side surface of the mounting part 31 to be fixed together, so as to improve the ultrasonic conduction efficiency and reduce the loss during the conduction process. The conduction part 32 is inclined relative to the riser sleeve 1, and its upper end passes through the absorption layer 2 and extends above the riser sleeve 1. The upper end surface thereof is used for docking with the ultrasonic generating device, so that the ultrasonic generating device can be located away from the position of the riser sleeve 1, reducing the influence of the high temperature at the riser sleeve 1 during casting on the ultrasonic generating device.

[0037] As a more optimized embodiment, as Figure 3 shown, the upper part of the riser sleeve 1 has a connecting part 12, the connecting part 12 is conical, and the inner cavity of the mounting part 31 matches the conical structure of the connecting part 12. The matching of the mounting part 31 and the connecting part 12 with a conical structure can ensure that the mounting part 31 and the connecting part 12 can be closely fitted during assembly, and can reduce the ultrasonic conduction loss. The inner wall of the mounting part 31 at the upper part of the riser sleeve 1 is also conical, reducing the opening size at the upper part of the riser sleeve 1 and reducing the heat loss of the molten metal in the riser sleeve 1, which is beneficial to improving the feeding effect.

[0038] In a further solution, as Figures 1 to 4As shown, a pressure sleeve 33 is provided above the installation part 31. The pressure sleeve 33 is sleeved outside the riser sleeve 1 and abuts against the installation part 31. The pressure sleeve 33 can be connected to the riser sleeve 1 by means of threads or other methods. The setting of the pressure sleeve 33 can press the installation part 31 against the riser sleeve 1 to prevent the installation part 31 from becoming loose.

[0039] Although the present disclosure is disclosed as above, the scope of protection of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the scope of protection of this application.

Claims

1. An ultrasonically assisted feeding riser structure, characterized in that: include A riser sleeve (1), the inner cavity of which forms a cavity for storing metal liquid; An ultrasonic receiving seat (3) is arranged outside the riser sleeve (1) and is configured to dock with an ultrasonic generating device to transmit ultrasound to the riser sleeve (1); An absorption layer (2) is wrapped around the outside of the riser sleeve (1).

2. The ultrasonically assisted feeding riser structure according to claim 1, characterized in that: It also comprises a shell (4), wherein the absorption layer (2) is arranged inside the shell (4).

3. The ultrasonically assisted feeding riser structure according to claim 2, characterized in that: The shell (4) and the absorption layer (2) are of a spliced ​​structure.

4. The ultrasonically assisted feeding riser structure according to claim 1, characterized in that: A storage portion (11) is provided inside the riser sleeve (1), and the size of the storage portion (11) is larger than the size of other parts of the riser sleeve (1).

5. The ultrasonically assisted feeding riser structure according to claim 4, characterized in that: The top of the inner cavity of the storage portion (11) protrudes upward to form a collecting cavity (13); the cross section of the collecting cavity (13) is in an inverted "V" shape; the bottom of the collecting cavity (13) is connected to the upper inner wall of the riser sleeve (1) via a conical guide surface (14).

6. The ultrasonically assisted feeding riser structure according to claim 4 or 5, characterized in that: An electromagnetic coil (5) is arranged outside the absorption layer (2), and the electromagnetic coil (5) corresponds to the position of the storage part (11).

7. The ultrasonically assisted feeding riser structure according to claim 1, characterized in that: The ultrasonic receiving seat (3) comprises a mounting portion (31) and a conducting portion (32), wherein the mounting portion (31) is sleeved on the outside of the riser sleeve (1), one end of the conducting portion (32) extends above the riser sleeve (1) and is connected to the mounting portion (31), and the other end is connected to the ultrasonic generating device.

8. The ultrasonically assisted feeding riser structure according to claim 7, characterized in that: The upper part of the riser sleeve (1) is provided with a connecting portion (12), the connecting portion (12) is conical, and the inner cavity of the mounting portion (31) matches the conical structure of the connecting portion (12).

9. The ultrasonically assisted feeding riser structure according to claim 7 or 8, characterized in that: The riser sleeve (1) and the ultrasonic receiving seat (3) are made of steel or ceramic materials; the absorption layer (2) is made of rock wool or aluminum silicate fiber wool.

10. The ultrasonically assisted feeding riser structure according to claim 7 or 8, characterized in that: A pressing sleeve (33) is arranged above the mounting portion (31); the pressing sleeve (33) is sleeved on the outside of the riser sleeve (1) and abuts against the mounting portion (31).

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