Riser bush for casting

Abstract

The utility model provides a riser bush for casting. The riser bush comprises a riser base body and a casting contact ring arranged at one end of the riser base body, a plurality of shape-following grooves are formed in the outer circumferential face of the casting contact ring and used for supporting sand cores, a plurality of inner protrusions extending towards one side in the ring are arranged on the inner circumferential face of the casting contact ring, and the shape of the shape-following grooves is matched with the shape of the inner protrusions. According to the riser bush for casting, the phenomenon of interference between a riser and a column nest cross rib structure can be avoided, and the removal rate of the riser is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of foundry sand box, specifically speaking, relate to a riser sleeve for casting. BACKGROUND

[0002] In the production process of cast steel parts, in order to make up the volume shrinkage of castings in the solidification process of steel liquid, riser sleeve is needed to be used for feeding to prevent shrinkage porosity defects in the hot spot part of castings. After the solidification of castings, the riser is removed. Among them, when casting the column nest, the common riser on the market is circular or waist type. Due to the limitation of the cross rib structure of the column nest, the sand core of the weight reduction hole is affected by the space occupied by the riser, so that the sand layer near the cross rib and the outer edge of the riser is very thin, the strength is low, and there is a sand dropping quality defect in cutting, which leads to the scrap of castings. At the same time, after the solidification of the castings, there are excess meat defects in the transition arc part near the cross rib of the lower part of the riser, which increases the weight of the castings, increases the production cost, and affects the appearance of the castings.

[0003] The utility model patent with the authorization announcement number CN220837818U discloses a kind of riser sleeve assembly device for casting, including mounting frame and the locating mechanism being set in the outer side of mounting frame and the clamping mechanism being located in the inside of mounting frame, the center of the upper surface of riser sleeve abuts with electric extrusion mechanism, the top center of mounting frame is clamped with top protective cover. The riser sleeve assembly device for casting, by the setting of locating mechanism, make the center of riser with the center of riser sleeve installed in the inside of mounting frame be in same vertical line, will not make the connection of riser and riser sleeve occur inclination, cause tangential force to cause abrasion of connection, not only realize fast and accurate positioning, but also improve the service life of riser and riser sleeve. Although the device can improve the positioning accuracy of riser, it still does not solve the problem of interference between riser and column nest cross rib structure. UTILITY MODEL CONTENT

[0004] In order to avoid the interference phenomenon between the riser and the column nest cross rib structure and improve the removal rate of the riser, the technical scheme adopted by the utility model is: a riser sleeve for casting, comprising a riser base body and a casting contact ring arranged at one end of the riser base body.

[0005] A plurality of random-shaped grooves are formed on the outer circumferential surface of the casting contact ring, and the random-shaped grooves are used to support the sand core. A plurality of inner protrusions extending to one side of the inner circumferential surface of the casting contact ring are arranged. The shape of the random-shaped groove matches the shape of the inner protrusion.

[0006] Based on the above, in order to improve the versatility, the top surface of the casting contact ring is a plane, and the top surface of the inner protrusion is flush with the top surface of the casting contact ring.

[0007] Based on the above, the thickness value of the inner protrusion is equal to the thickness value of the casting contact ring.

[0008] Based on the above, the riser base is a cylindrical riser base, the casting contact ring is a circular casting contact ring, and the bottom of the casting contact ring is seamlessly connected to one end of the cylindrical riser base.

[0009] Based on the above, in order to match the column socket cross rib, four said profiled grooves and four said inner protrusions are evenly distributed on the outer peripheral surface of the casting contact ring.

[0010] Based on the above, in order to facilitate air permeation, the other end of the riser base is provided with a cover plate, and the cover plate is provided with an air permeation hole.

[0011] Based on the above, the inner side surface of the cover plate is provided with a protrusion, the protrusion is arranged along the center line of the cover plate, and the air permeation hole is arranged at the center of the cover plate and penetrates through the protrusion.

[0012] Based on the above, in order to facilitate the removal of sand particles in the riser, the inner side wall of the inner protrusion is a slope inclined from top to bottom towards the inner side of the ring.

[0013] Compared with the prior art, the casting riser sleeve has substantial characteristics and progress, specifically, the casting riser sleeve provided by the utility model is provided with a profiled groove at one end of the riser, the profiled groove forms a profiled structure at the connecting part of the riser and the casting, the profiled part of the lower part of the riser is determined according to the size of the cross rib of the casting, thereby ensuring that the feeding channel of the riser is not affected. Meanwhile, the inner cavity and the outer contour of the profiled part of the lower part of the riser are made to have a slope, the inner cavity slope facilitates the removal of sand particles in the riser, and simultaneously reduces the weight of the riser and the cost of raw materials.

[0014] Further, the surface of the riser in contact with the casting is a plane, without convex and concave and large amplitude narrowing cross section part, consistent with the use of conventional circular riser, strong applicability, can be directly used on the cover plate sand core.

[0015] Further, since the surface of the riser in contact with the casting is a plane, the removal efficiency of the riser is improved, compared with the original circular riser cutting operation, the removal rate efficiency of the same specification riser is improved by 5%, and it is more safe and reliable, the riser break is neat, and the residual height is low. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall structure schematic view of the casting riser sleeve provided by the utility model.

[0017] Figure 2 is the cross-sectional structure schematic view of the casting riser sleeve provided by the utility model.

[0018] Figure 3 is the end structure schematic view of the casting riser sleeve provided by the utility model.

[0019] In the figure: 1, riser base body; 2, casting contact ring; 3, inner convex; 4, cavity; 5, profiled groove; 6, cover plate; 7, gas hole; 8, convex rib. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be described in further detail below through specific embodiments.

[0021] Embodiment 1

[0022] The embodiment provides a casting riser sleeve, as shown in the drawings, comprising a riser base body 1 and a casting contact ring 2 arranged at one end of the riser base body 1. A plurality of profiled grooves 5 are arranged on the outer circumferential surface of the casting contact ring 2, and the profiled grooves 5 are used for supporting sand cores. A plurality of inner convexes 3 extending to one side of the ring are arranged on the inner circumferential surface of the casting contact ring 2, and the shape of the profiled grooves 5 matches the shape of the inner convexes 3. Figure 1 Figure 2 Figure 3 The embodiment provides a casting riser sleeve, as shown in the drawings, comprising a riser base body 1 and a casting contact ring 2 arranged at one end of the riser base body 1. A plurality of profiled grooves 5 are arranged on the outer circumferential surface of the casting contact ring 2, and the profiled grooves 5 are used for supporting sand cores. A plurality of inner convexes 3 extending to one side of the ring are arranged on the inner circumferential surface of the casting contact ring 2, and the shape of the profiled grooves 5 matches the shape of the inner convexes 3.

[0023] Embodiment 2

[0024] The embodiment provides a casting riser sleeve, and the main difference from the embodiment 1 is that, in the embodiment, in order to improve the versatility, the top surface of the casting contact ring 2 is a plane, the top surface of the inner convex 3 is flush with the top surface of the casting contact ring 2. The thickness value of the inner convex 3 is equal to the thickness value of the casting contact ring 2.

[0025] Embodiment 3

[0026] The embodiment provides a casting riser sleeve, and the main difference from the embodiment 1 is that, in the embodiment, the riser base body 1 is a cylindrical riser base body, and a cavity 4 for containing molten steel is formed in the inside of the cylindrical riser base body. The casting contact ring 2 is a circular ring-shaped casting contact ring, and the bottom of the casting contact ring 2 is seamlessly connected to one end of the cylindrical riser base body.

[0027] Embodiment 4

[0028] The embodiment provides a casting riser sleeve, and the main difference from the embodiment 1 is that, in the embodiment, in order to match the column socket cross rib, the casting riser sleeve in the embodiment comprises four profiled grooves 5 and four inner convexes 3, and the four profiled grooves 5 are uniformly distributed on the outer circumferential surface of the casting contact ring 2.

[0029] Embodiment 5

[0030] ​​The embodiment provides a riser sleeve for casting, and the main difference between the embodiment and the embodiment 1 is that, in the embodiment: in order to facilitate air permeation, the other end of the riser base body 1 is provided with a cover plate 6, and air permeation holes 7 are formed in the cover plate 6. The inner side of the cover plate 6 is provided with a convex rib 8, the convex rib 8 is arranged along the center line of the cover plate 6, and the air permeation holes 7 are arranged in the center of the cover plate 6 and penetrate through the convex rib 8.

[0031] Embodiment 6

[0032] The embodiment provides a riser sleeve for casting, and the main difference between the embodiment and the embodiment 1 is that, in the embodiment: in order to facilitate air permeation, the other end of the riser base body 1 is provided with a cover plate 6, and air permeation holes 7 are formed in the cover plate 6. The inner side of the cover plate 6 is provided with a convex rib 8, the convex rib 8 is arranged along the center line of the cover plate 6, and the air permeation holes 7 are arranged in the center of the cover plate 6 and penetrate through the convex rib 8.

[0033] Specifically, the riser lower part of the riser sleeve for casting is shaped according to the cross rib size of the casting, for example, when the cross rib width of the casting is L1 and L2, the corresponding size of the riser shaped part is L1 minus 4mm and L2 minus 4mm, and the casting scale is reduced in the same proportion. The height of the riser lower part of the shaped part is not too high, preferably 30mm to 50mm, too high affects the riser feeding effect, and too low has poor riser strength. The inner cavity and the outer contour of the riser lower part of the shaped part are inclined, the inner cavity is inclined to facilitate the removal of sand particles in the riser, reduce the weight of the riser itself, and reduce the raw material cost. The inner cavity inclination is preferably L1 plus 20mm and L2 plus 20mm corresponding to the cross rib width of the casting, and the casting scale is reduced in the same proportion.

[0034] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical scheme of the present application, they should be covered in the technical scheme range of the present application.

Claims

1. A riser sleeve for casting characterized by: The riser base body and the casting contact ring are connected seamlessly. The outer circumferential surface of the casting contact ring is provided with a plurality of profiled grooves for supporting the sand core.

2. The riser sleeve for casting according to claim 1, characterized by: The top surface of the casting contact ring is a plane, and the top surface of the inner protrusion is flush with the top surface of the casting contact ring.

3. The riser sleeve for casting according to claim 1 or 2, characterized by: The thickness of the inner protrusion is equal to the thickness of the casting contact ring.

4. The riser sleeve for casting according to claim 1, characterized by: The riser base body is a cylindrical riser base body, and the casting contact ring is a circular ring-shaped casting contact ring.

5. The riser sleeve for casting according to claim 1 or 2 or 4, characterized by: The bottom of the casting contact ring is connected seamlessly to one end of the cylindrical riser base body.

6. The riser sleeve for casting according to claim 5, characterized by: The riser base body is provided with a cover plate at the other end, and the cover plate is provided with a gas permeable hole.

7. The riser sleeve for casting according to claim 6, characterized by: The inner side surface of the cover plate is provided with a protruding rib along the center line of the cover plate, and the gas permeable hole is arranged at the center of the cover plate and penetrates through the protruding rib.

8. The riser sleeve for casting according to claim 1 or 2 or 4, characterized by: The inner side wall of the inner protrusion is an inclined surface that slopes from top to bottom towards the inside of the ring.

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