An easily mounted and detached feeding head

Abstract

The utility model relates to casting technical field discloses an easy installation and separate make up riser, including riser body, the riser body includes integrally arranged riser cylinder and riser seat, still include riser neck, the riser neck is connected with riser seat and communicates, the riser neck is provided with the make up liquid passage that communicates with the riser body, the diameter of make up liquid passage is less than the diameter of riser cylinder, the inside of riser neck is provided with annular convex part protruding from the inner wall of riser neck, the diameter of make up liquid passage at convex part place is minimum, the utility model discloses a riser neck is set up on the riser body, and the diameter smaller make up liquid passage that sets up on the riser neck is communicated with the casting cavity and carries out make up liquid. And when metal solidifies, will produce a stress concentration incision at the taper channel in make up liquid passage, and the quick separation of the metal in riser and casting is convenient to realize.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and in particular to a feeding riser that is easy to install and separate. Background Technology

[0002] In existing casting processes, the density change during the cooling and solidification of molten metal after filling the mold cavity leads to volume shrinkage, resulting in casting defects such as shrinkage cavities and porosity in the final solidified areas of the casting. To avoid defects, especially in thick sections, it is usually necessary to add one or more risers to the top or sides of the casting.

[0003] The riser cavity is a hollow space that stores molten metal. It replenishes the casting with molten metal as it cools and solidifies, preventing defects such as shrinkage cavities and porosity. To fully utilize the riser's function, it needs to contain a sufficient amount of molten metal to ensure that the connection between the riser and the casting remains filled with metal after final replenishment. However, this design also results in a large cross-sectional area at the connection between the solidified metal in the riser and the casting when separating the riser after casting. The usual method for handling this connection is to cut it apart using methods such as gas cutting or sawing. The larger the cross-sectional area of ​​the connection, the longer the cutting time and the lower the separation efficiency.

[0004] To improve the efficiency of separating the metal inside the riser from the casting, Chinese patent CN216325045U, entitled "A Heat-Insulating Riser Sleeve", discloses a heat-insulating riser sleeve, which includes a riser body with a circular and hollow cross section and an arc-shaped riser neck. The arc-shaped riser neck is located below the riser body and is integrated with the riser body. The arc-shaped riser neck is L-shaped in general and has a 90° arc transition section. The end of the arc-shaped riser neck away from the riser body forms a riser neck opening, which is connected to a boss on the mold through the riser neck opening.

[0005] The aforementioned patent reduces the diameter of the original riser by integrating the arc-shaped riser neck and the riser body into one unit, thereby reducing the riser's cutting area by 40.2%. This improves separation efficiency by reducing the cross-sectional area at the connection between the metal inside the riser and the casting. However, for some larger castings, the required replenishment volume is significant. Given the relatively small overall volume of the aforementioned riser, insufficient liquid metal within the riser may occur during the replenishment process. Therefore, how to improve separation efficiency while ensuring sufficient metal within the riser remains a problem that those skilled in the art need to solve. Utility Model Content

[0006] To address the problems existing in the prior art, where a large cross-sectional area at the connection between the sufficient amount of metal in the riser and the casting after molding leads to low separation efficiency, this invention aims to provide an easy-to-install and easy-to-separate feeding riser. This is achieved by setting a riser neck on the riser body, through which a small-diameter feeding channel is opened, connecting to the casting cavity for feeding. After the metal solidifies, a stress-concentrated notch is created at the conical channel within the feeding channel, facilitating rapid separation of the metal from the casting.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] An easy-to-install and detachable feeding riser includes a riser body, which includes an integrally formed riser cylinder and riser seat, and a riser neck. The riser neck is connected and communicates with the riser seat. The riser neck has a liquid replenishment channel communicating with the riser body. The diameter of the liquid replenishment channel is smaller than the diameter of the riser cylinder. The riser neck has an annular protrusion protruding from the inner wall of the riser neck. The diameter of the liquid replenishment channel is smallest at the protrusion.

[0009] The present invention is further configured such that: the replenishing channel is used to connect the casting cavity; a conical channel is provided on the side of the riser neck near the casting cavity; the smaller diameter end of the conical channel coincides with the apex of the protrusion; and the smaller diameter end of the conical channel is away from the casting cavity.

[0010] The present invention is further configured such that the riser neck and the riser seat are integrally formed.

[0011] The present invention is further configured such that the included angle between the axis of the replenishment channel and the axis of the riser cylinder is a first included angle, and the value range of the first included angle is 60°-70°.

[0012] The present invention is further configured such that the first included angle is 65°.

[0013] The present invention is further configured such that: the axis of the conical channel coincides with the axis of the replenishment channel, and the included angle between the inclined sidewall of the conical channel and the axis of the conical channel is a second included angle, wherein the second included angle does not exceed 90° and is not less than 25°.

[0014] The present invention is further configured such that the range of the second included angle is 30°-45°.

[0015] The present invention is further configured such that both the riser neck and the riser body are made of heat-generating and heat-insulating materials.

[0016] The present invention is further configured such that a heating material is provided at the protrusion.

[0017] The present invention is further configured such that the ratio of the minimum cross-sectional area of ​​the replenishment channel to the cross-sectional area of ​​the riser cylinder is less than 0.25.

[0018] In summary, the beneficial effects achieved by this utility model are as follows:

[0019] (1) By setting a riser neck on the riser body, the diameter of the liquid replenishment channel on the riser neck is smaller than the diameter of the riser cylinder, and the ratio of the cross-sectional area of ​​the liquid replenishment channel to the cross-sectional area of ​​the riser cylinder is less than 0.25. Compared with the riser being directly connected to the casting, the setting of the riser neck greatly reduces the cross-sectional area at the connection between the metal inside the riser and the casting, thus improving the separation efficiency;

[0020] (2) The protrusion inside the riser neck further reduces the diameter of the liquid replenishment channel at the protrusion, and the smaller diameter end of the conical channel coincides with the apex of the protrusion. That is, the protrusion causes a stress concentration notch to be formed at the connection between the metal inside the riser and the casting at the location of the protrusion. When separating the casting and the riser, the force applied to the riser is concentrated at the notch, so that the notch can be broken by simply striking it, and the fracture location is far away from the casting. Separation can be achieved without other cutting operations, which can greatly improve the separation efficiency.

[0021] (3) The angle between the axis of the replenishment channel and the axis of the riser cylinder is set at about 65°. This not only avoids the riser body being too close to the casting and affecting the heat dissipation and solidification of the casting, but also allows the riser neck and riser seat to form a cavity at the bottom of the riser seat after the riser is installed and fixed, which can collect liquid metal. The heat carried by the liquid metal accumulated in the cavity can interrupt the condensation of liquid metal along the inner wall of the riser cylinder to the replenishment channel, thereby ensuring the feeding effect of the riser;

[0022] (4) Both the riser body and the riser neck are made of heat-generating and heat-insulating materials. In particular, the raised part at the smallest diameter of the liquid replenishment channel is provided with heat-generating material to ensure that the liquid metal in the liquid replenishment channel condenses later than the liquid metal in the riser body.

[0023] (5) Within a certain angle range, the larger the angle between the inclined sidewall of the conical channel and the axis of the conical channel, the more obvious the stress concentration effect of the cut at the protrusion position when subjected to external force, and the easier it is for the connection to break, resulting in higher separation efficiency.

[0024] (6) The riser body and riser neck are integrated, which allows risers in vertical or inclined states to be quickly and easily connected to the casting cavity. No additional connecting body is needed when installing risers, which significantly improves installation efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the specification will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a schematic diagram of the riser structure in this utility model;

[0027] Figure 2 This is a front view of the riser in this utility model;

[0028] Figure 3 This is a side view of the riser in this utility model;

[0029] Figure 4 for Figure 3 A cross-sectional view on plane AA;

[0030] Figure 5 Schematic diagram of the connection between the riser and the casting cavity Figure 1 ;

[0031] Figure 6 Schematic diagram of the connection between the riser and the casting cavity Figure 2 ;

[0032] Figure 7 This is a schematic cross-sectional view of the riser in other embodiments of the present invention. Figure 1 ;

[0033] Figure 8 This is a schematic cross-sectional view of the riser in other embodiments of the present invention. Figure 2 .

[0034] In the figure: 1. Riser body; 11. Riser tube; 12. Riser seat; 13. Liquid inlet; 2. Riser neck; 21. Liquid replenishment channel; 22. Protrusion; 23. Conical channel; 3. Casting cavity; α. First included angle; β. Second included angle; B. Cavity connection surface; C. Conical surface; D. Cut surface. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. For ease of explanation, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "inner", "outer", "bottom", etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] As attached Figure 1-4 As shown, an easy-to-install and detachable feeding riser includes a riser body 1 and a riser neck 2.

[0038] The riser body 1 includes an integrally formed riser tube 11 and riser seat 12. The riser tube 11 is a cylindrical structure, and the riser seat 12 is a hemispherical shell structure, located at the bottom of the riser tube 11. The riser seat 12 and the riser tube 11 have the same radius and wall thickness, thus allowing the riser seat 12 and the riser tube 11 to be connected as one piece.

[0039] The top of the riser body 1 is the liquid inlet 13. During use, liquid metal is poured into the riser body 1 through the liquid inlet 13. In actual use, the riser in this invention also requires a sealing cap with vent holes (not shown in the figure) above the liquid inlet 13 to keep the liquid metal inside the riser warm. Since the sealing cap is prior art, its structure will not be described in detail here.

[0040] As attached Figure 2-5 As shown, the riser neck 2 is a trumpet-shaped cylindrical structure. Its larger opening end connects to the riser seat 12, and the riser body 1 and riser neck 2 are integrally formed. The smaller opening end of the riser neck 2 connects to the casting cavity 3. The central channel of the riser neck 2 is the replenishment channel 21, with one end connected to the riser body 1 and the other end connected to the casting cavity 3. Furthermore, the diameter of each point on the replenishment channel 21 is significantly smaller than the diameter of the riser cylinder 11. During actual riser installation, because the riser neck 2 is integrally formed on the riser body, the riser can be quickly and easily connected to the casting cavity 3 regardless of whether it is vertical or inclined, without the need for additional connecting parts, thus significantly improving installation efficiency.

[0041] In the actual casting process, after the liquid metal enters the casting cavity 3 and the riser, as the liquid metal in the casting cavity 3 gradually cools down and solidifies, when the metal in the casting cavity 3 produces shrinkage, the liquid metal in the riser flows into the casting cavity 3 in time through the liquid replenishment channel 21 to complete the shrinkage replenishment.

[0042] As attached Figure 4 and attached Figure 5 As shown, the angle between the axis of the riser cylinder 11 (which is also the axis of the riser body 1) and the axis of the liquid replenishment channel 21 is the first included angle α, and the value of the first included angle α ranges from 60° to 70°. Since the axis of the riser cylinder 11 is always located at the center of the riser body 1, the size of the first included angle α determines the orientation of the riser neck 2 opening. Within this angle range, a suitable distance can be maintained between the riser as a whole and the casting cavity 3, preventing the riser from being too close to the casting cavity 3 and affecting the heat dissipation and solidification of the casting.

[0043] Furthermore, as attached Figure 4-6 As shown, when the riser is connected to the casting cavity 3, especially when the riser is connected to the vertical casting cavity 3, a concave cavity region X for accumulating liquid metal will be formed inside the hemispherical riser seat 12.

[0044] Those skilled in the art will understand that, to fully utilize the feeding function of the riser, the condensation time of the liquid metal in the riser should be later than that of the liquid metal in the casting cavity 3. When the liquid metal in the riser condenses, the temperature is lowest at the riser wall, so condensation begins first at the inner wall of the riser and gradually extends along the inner wall. The heat carried by the liquid metal accumulated in the concave region X can interrupt the rapid condensation of the liquid metal along the inner wall of the riser cylinder 11 onto the replenishment channel 21, preventing blockage of the replenishment channel 21 and thus ensuring the feeding effect of the riser. The larger the first included angle α, the more liquid metal can accumulate in the concave region X, and the more liquid metal is used to prevent blockage of the replenishment channel 21, but at the same time, more liquid metal is wasted. To balance the heat preservation and anti-blockage function with the resulting waste of liquid metal, a first included angle α of 65° is optimal.

[0045] The riser neck 2 is also provided with a protrusion 22. The protrusion 22 is a sharp annular protrusion on the inner wall of the riser neck 2 on the liquid replenishment channel 21, so the diameter of the entire liquid replenishment channel 21 is smallest at the protrusion 22. Furthermore, the protrusion 22 extends to both sides from its tip with smooth, inclined surfaces, especially forming a tapered channel 23 on the side near the casting cavity 3.

[0046] The conical channel 23 is part of the replenishment channel 21, with their axes coinciding. The cross-section of the conical channel 23 is an isosceles trapezoid. The circular cross-section formed at the smaller diameter end of the conical channel 23 is denoted as the cut surface D, which is positioned away from the casting cavity 3. Furthermore, the edge of the cut surface D coincides with the apex of the protrusion 22. Therefore, after the liquid metal in both the casting cavity 3 and the riser solidifies, the protrusion 22 creates a stress-concentrated cut at the connection between the residual metal in the riser and the casting. During actual separation of the casting and the riser, striking the riser concentrates the impact force at the cut surface, causing cracks to appear in the metal at that location. Continuous striking extends the crack along the cut surface D until all the metal at the cut surface D breaks, achieving rapid separation without further cutting operations.

[0047] The inclined surface of the tapered channel 23 is denoted as tapered surface C, and the angle between tapered surface C and the axis of tapered channel 23 is called the second included angle β. The second included angle β does not exceed 90° and is not less than 25°. The existence of the second included angle β allows the impact force during separation to be concentrated on the cut surface D at the protrusion 22. Within a certain range, the larger the second included angle β, the more obvious the stress concentration effect, the easier it is for the connection to break, and the more conducive it is to separation. However, the larger the second included angle β, the smaller the height of tapered surface C in the axial direction, and the closer the cut surface D is to the casting cavity 3. Cracks on the cut surface D may propagate to the casting. Therefore, to protect the casting while expanding the stress concentration effect, the optimal value of the second included angle β is between 30° and 45°.

[0048] Since the cut surface D is the smallest cross-section on the liquid replenishment channel 21, in this invention, the ratio of the area of ​​the cut surface D to the cross-sectional area of ​​the riser cylinder 11 is less than 0.25, that is, by reducing the cross-sectional area of ​​the connection between the residual metal in the riser and the casting, further rapid separation can be achieved.

[0049] In existing technologies, risers are generally made of insulating or heating insulating materials, both of which are commonly used. In this invention, both the riser body 1 and the riser neck 2 are made of heating insulating materials, such as alumina fiber cotton mixed with thermite. Thermite provides heat to delay the solidification of the liquid metal inside the riser. Because the diameter of the replenishment channel 21 is small and prone to solidification, heating material needs to be added to the riser neck 2 outside the replenishment channel 21, especially to the protrusion 22 located at the cut surface D, where more heating material, such as thermite, needs to be added to ensure the replenishment channel 21 remains unobstructed.

[0050] The annular surface at the end of riser neck 2 that contacts the casting cavity 3 is designated as cavity connection surface B, as shown in the attached figure. Figure 6-8As shown, the area of ​​the cavity connection surface B between the riser and the casting cavity 3 is not fixed for different castings and can be adjusted according to actual needs. At the same time, the diameter and wall thickness of the riser body 1, and the height of the tapered channel 23 in its own axial direction can all be flexibly adjusted.

[0051] The implementation principle of the above embodiments is as follows:

[0052] During casting, the cavity connecting surface B at the end of the riser neck 2 is tightly attached to and connected to the casting cavity 3. The interior of the riser body 1 is connected to the interior space of the casting cavity 3 through the liquid replenishment channel 21. After the liquid metal enters the casting cavity 3 and the riser, as the liquid metal in the casting cavity 3 gradually cools and solidifies, the volume of the metal in the casting cavity 3 shrinks. The liquid metal in the riser flows into the casting cavity 3 in a timely manner through the liquid replenishment channel 21 to complete the shrinkage. During this process, the heating material in the riser body 1, especially the protrusion 22 of the riser neck 2, continuously heats up to keep the metal in the riser in a liquid state. When the metal in the casting cavity 3 and the riser has solidified, due to the presence of the first included angle α, there is a large space between the riser and the casting cavity 3. By tapping the residual metal in the riser in a direction away from the casting cavity 3, a crack can be generated at the cut surface D. Continuous tapping can cause the crack to expand. Without allowing the crack to propagate to the casting body, the residual metal in the riser can be separated from the casting body by tapping.

[0053] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from its spirit and scope. Thus, if such modifications and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include such modifications and modifications.

Claims

1. A feed riser that is easy to install and detach, comprising a riser body (1), wherein the riser body (1) comprises an integrally formed riser cylinder (11) and a riser seat (12), characterized in that, It also includes a riser neck (2), which is connected and communicates with the riser seat (12). The riser neck (2) has a liquid replenishment channel (21) that communicates with the riser body (1). The diameter of the liquid replenishment channel (21) is smaller than the diameter of the riser cylinder (11). The riser neck (2) has an annular protrusion (22) protruding from the inner wall of the riser neck (2). The diameter of the liquid replenishment channel (21) is smallest at the protrusion (22).

2. The easy-to-install and detachable feeding riser according to claim 1, characterized in that, The replenishment channel (21) is used to connect the casting cavity. A conical channel (23) is provided on the side of the riser neck (2) near the casting cavity. The smaller diameter end of the conical channel (23) coincides with the apex of the protrusion (22). The smaller diameter end of the conical channel (23) is away from the casting cavity.

3. The easy-to-install and detachable feeding riser according to claim 1, characterized in that, The riser neck (2) and riser seat (12) are integrally formed.

4. The easy-to-install and detachable feeding riser according to claim 1, characterized in that, The angle between the axis of the replenishment channel (21) and the axis of the riser cylinder (11) is the first angle, and the value of the first angle is 60°-70°.

5. The easy-to-install and detachable feeding riser according to claim 4, characterized in that, The first included angle is 65°.

6. The easy-to-install and detachable feeding riser according to claim 2, characterized in that, The axis of the conical channel (23) coincides with the axis of the replenishment channel (21), and the angle between the inclined sidewall of the conical channel (23) and the axis of the conical channel (23) is the second angle, which is not more than 90° and not less than 25°.

7. The easy-to-install and detachable feeding riser according to claim 6, characterized in that, The second included angle ranges from 30° to 45°.

8. The easy-to-install and detachable feeding riser according to claim 1, characterized in that, Both the riser neck (2) and the riser body (1) are made of heat-generating and heat-insulating materials.

9. The easy-to-install and detachable feeding riser according to claim 1 or 8, characterized in that, A heating material is provided at the protrusion (22).

10. The easy-to-install and detachable feeding riser according to claim 1, characterized in that, The ratio of the minimum cross-sectional area of ​​the replenishment channel (21) to the cross-sectional area of ​​the riser cylinder (11) is less than 0.25.

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