CN106955973A - Cast rising head - Google Patents

Abstract

The invention provides a casting riser, which solves the problem of existing castings with thick and large parts in the center of the casting, especially disc castings. In actual production, methods such as increasing process subsidies and adding auxiliary chillers are needed to eliminate casting shrinkage, porosity, and Shrinkage cavity defect, adding subsidy on the casting, after the casting is formed, the subsidy part needs to be polished off or removed by processing, which increases the processing workload and reduces the technical problem of production efficiency. It is equipped with a mold cavity, and the casting risk A riser neck is provided on one side of the mouth, and the riser neck communicates with the inner side of the mold cavity. The invention can be widely applied to the casting process, especially the casting of the disc-shaped casting with the thick part in the center of the casting.

Description

Casting Riser

technical field

The invention relates to the field of casting, in particular to a casting riser.

Background technique

In the foundry industry, setting the riser is one of the important measures to ensure the quality of the casting. The pouring of molten iron in the mouth can complete the replenishment of the solid part of the casting in time to prevent casting defects such as shrinkage cavities and shrinkage porosity in the casting. At the same time, the riser also has the functions of exhaust and slag collection.

For existing castings with thick and large parts in the center of the casting, especially disc castings, the conventional design method for the riser is to use an external riser. Due to the influence of the casting structure, the molten iron in the riser cannot be fed to the inside of the casting. Therefore, in actual production, it is necessary to increase process subsidies and increase auxiliary chilled iron to eliminate shrinkage porosity and shrinkage cavity defects of castings. The subsidy is added to the casting. After the casting is formed, the subsidy part needs to be ground or processed to remove it, which increases the processing workload and reduces the production efficiency; the auxiliary chiller is added to the casting to chill the core of the casting, although it can guarantee The casting realizes sequential solidification and exerts the feeding effect of the riser, but the use of auxiliary chilled iron will affect the local structure and shape of the casting.

Fig. 1 is a schematic diagram of the existing casting riser structure, and the defects of the existing casting riser structure will be described in detail below in conjunction with Fig. 1 .

As can be seen in Figure 1, it is a typical existing external casting riser, which is provided with an upper mold cavity 5 and a lower mold cavity 7, and a casting sand core is arranged between the upper mold cavity 5 and the lower mold cavity 7 6. Risers are provided on the outer sides of the upper mold cavity 5 and the lower mold cavity 7. The risers include the upper riser 1 and the lower riser 2. The lower riser 2 is located at the lower part of the upper riser 1, and the upper riser 1 and the lower riser 2 communicate with the upper mold cavity 5 and the lower mold cavity 7 through the riser neck 3. For such a riser setting, the riser neck subsidy 4 must be set at the adjacent position of the riser neck 3, and at the same time A cold iron 8 is set away from the riser side. When the casting solidification modulus is M, the riser modulus Mr=1.2-1.4M, the riser neck modulus Mn=0.75-0.85M, according to the calculation formula, determine Mr and Mn, so as to eliminate the internal shrinkage of the casting, Shrinkage cavity defects; for the size of the riser neck 3, it is necessary to increase the riser neck allowance 4 on the casting according to the modulus to meet the needs of the riser neck modulus, and increase the riser neck allowance 4 on the casting. , It needs to be removed by grinding or processing in the later stage, which increases the workload and reduces the production efficiency.

For castings with a thick central part, especially disc castings, due to the influence of the casting structure, the cooling rate of the central part of the casting is slower than that of the casting part far away from the center. The shrinkage of the casting during solidification will produce shrinkage cavities and shrinkage porosity in the central part of the casting. and other casting defects; if an external riser is used, it is necessary to increase the riser neck subsidy 4 on the casting, and the method of adding chill iron 8 is also required to chill the core of the casting to ensure that the casting can be realized from the center of the casting to the Stay away from the requirements of sequential solidification of the central casting part, give full play to the feeding effect of the riser, and eliminate defects such as shrinkage porosity and shrinkage cavity of the casting, but the use of chilled iron 8 will affect the local structure of the casting and the shape quality of the casting.

Contents of the invention

The present invention is to solve the existing castings with thick and large parts in the center of the castings, especially the disc castings. In actual production, it is necessary to increase process subsidies and increase auxiliary cooling irons to eliminate shrinkage porosity and shrinkage cavity defects of castings, and increase castings. Subsidy, after the casting is formed, the subsidy part needs to be ground or processed to remove it, which increases the processing workload and reduces the production efficiency. An auxiliary chiller is added to the casting to chill the core of the casting, although the order of casting can be guaranteed Solidification, to play the feeding role of the riser, but the use of auxiliary chilled iron will affect the technical problems of the local structure and shape of the casting and the shape of the casting. Provide a casting with a thick and large part in the center of the casting, especially the disc casting. In actual production, there is no need to increase process subsidies and auxiliary cooling irons, and it is not necessary to grind or remove the subsidy part, which will not increase the processing workload and reduce production efficiency. There is no need to add auxiliary cooling irons on castings. A casting riser that will not affect the local structure and shape of the casting.

The technical solution of the present invention is that a casting riser is provided with a mold cavity, and a riser neck is provided on one side of the casting riser, and the riser neck communicates with the inner side of the mold cavity.

Preferably, the mold cavity includes an upper mold cavity and a lower mold cavity, a casting parting surface is provided between the upper mold cavity and the lower mold cavity, and a casting riser is provided inside the upper mold cavity, and the casting riser There is a riser neck on the side. The casting riser includes an upper riser and a lower riser. The lower riser is located at the bottom of the upper riser. The upper riser and the lower riser are located inside the upper mold cavity and the lower mold cavity. The riser neck It communicates with the inner side of the upper mold cavity.

Preferably, the riser neck communicates with the inside of the cavity of the lower mold.

Preferably, the riser neck communicates with the inside of the upper mold cavity and the inner side of the lower mold cavity simultaneously.

Preferably, the lower riser is located at the lower part of the casting parting surface, the bottom of the lower riser is circular, and the bottom of the lower riser is lower than the bottom of the riser neck.

Preferably, the riser neck is provided with a riser neck tail, and the riser neck communicates with the inside of the mold cavity through the riser neck tail.

Preferably, a casting sand core is arranged in the middle of the mold cavity, and the casting riser is located inside the casting sand core.

Preferably, the riser neck is in a conical shape, and the diameter of the connecting portion between the tail of the riser neck and the upper mold cavity and the lower mold cavity is smaller than the diameter of the connecting portion between the riser neck and the sides of the upper riser and the lower riser.

The beneficial effect of the present invention is: because a casting riser is provided with a mold cavity, one side of the casting riser is provided with a riser neck, and the riser neck communicates with the inner side of the mold cavity, during casting, the poured molten iron, etc. When cooling shrinkage occurs in the casting formed by the material, it will be replenished from the position of the riser set inside. At the same time, the internal riser structure reduces the modulus of the riser and riser neck of the casting by 20-30%, reduces the weight of the riser, and improves The process yield rate is 5-10%; there is no need to increase the riser neck subsidy on the casting, which improves the productivity of modeling and grinding, and does not need to use cold iron, which improves the internal structure and appearance quality of the casting.

Description of drawings

Fig. 1 is the structural representation of existing foundry riser;

Fig. 2 is the structural representation of casting and casting riser of the present invention;

Fig. 3 is a schematic diagram of the structure of a casting riser comprising a casting upper mold and a casting lower mold according to the present invention.

Explanation of reference symbols:

1. Upper riser; 2. Lower riser; 3. Riser neck; 4. Riser neck subsidy; 5. Upper mold cavity; 6. Casting sand core; 7. Lower mold cavity; 8. Cold iron; 9. Casting upper mold; 10. Casting lower mold; 11. Casting parting surface; 12. Riser neck tail; 101. Casting riser.

detailed description

The present invention will be further described below in conjunction with the examples.

Fig. 2-3 is an embodiment of the present invention. As shown in Fig. 2, it is a schematic diagram of the structure of the casting and the casting riser of this embodiment. As shown in Fig. 3, it is the casting of the present embodiment including the casting upper mold and the casting lower mold. Schematic diagram of the riser structure.

It can be seen from Fig. 2 that a casting riser is provided with a mold cavity, and one side of the casting riser 101 is provided with a riser neck 3, and the riser neck 3 communicates with the inside of the mold cavity, and the mold cavity includes an upper mold cavity body 5 and the lower mold cavity 7, a casting parting surface 11 is provided between the upper mold cavity 5 and the lower mold cavity 7, and a casting riser 101 is provided on the inner side of the upper mold cavity 5, and a casting riser is provided on the side of the casting riser. Riser neck 3, casting riser includes upper riser 1 and lower riser 2, lower riser 2 is located at the bottom of upper riser 1, upper riser 1 and lower riser 2 are located in upper mold cavity 5 and lower mold cavity 7. Inside, the riser neck 3 communicates with the inner side of the upper mold cavity 5. During casting, when castings formed by pouring molten iron and other pouring materials appear cooling shrinkage, they will be replenished from the riser position set inside.

In this embodiment, the riser neck 3 communicates with the inside of the lower mold cavity 7, and the riser neck 3 can also communicate with the inside of the upper mold cavity 5 and the lower mold cavity 7 at the same time, and the riser neck 3 is provided with a riser neck tail. 12. The riser neck 3 communicates with the inner side of the mold cavity 7 through the tail portion 12 of the riser neck.

As can be seen from Fig. 3, a casting riser is provided with a casting upper mold 9 and a casting lower mold 10, the casting upper mold 9 is provided with an upper mold cavity 5, and the casting lower mold 10 is provided with a lower mold cavity 7 There is a casting sand core 6 between the casting upper mold 9 and the casting lower mold 10, the upper riser 1 is located on the upper part of the casting sand core 6, the bottom of the upper riser 1 is connected with a lower riser 2, and the lower riser 2 is located in the casting parting The lower part of surface 11, such a structure facilitates the pouring of molten iron that enters the riser first to form a buffer. As the amount of molten iron overflowing into the inner riser increases, it will rise slowly until it reaches the required height, without causing damage to the The reflow impact of the casting can ensure the stability of the pouring process and improve the compactness of the casting. It can also be seen from the figure that the bottom of the lower riser 2 is circular, and the bottom of the lower riser 2 is lower than the bottom of the riser neck 3. When the molten iron flows to the pouring riser, it will not flow back, and the molten iron slag can also be removed, and the bottom of the riser neck 3 can be removed. The neck 3 is conical in shape, and the diameter of the connecting portion between the riser neck tail 12 and the upper mold cavity 5 and the lower mold cavity 7 is smaller than the diameter of the connecting portion between the riser neck 3 and the upper riser 1 and the lower riser 2 sides, which can Further buffer the molten iron.

In this embodiment, the risers provided on the outer sides of the upper mold cavity 5 and the lower mold cavity 7 of the existing casting are arranged inside the upper mold cavity 5 and the lower mold cavity 7, and the riser neck subsidy 4 and the riser neck subsidy 4 are removed. Cold iron 8, according to the design method of the riser, when the casting modulus is M, the riser modulus Mr=1.0-1.1M, the riser neck modulus remains unchanged, Mn=0.75-0.85M, no need to add to the casting Riser neck allowance.

Since the modulus of the riser of the casting is reduced by 20-30%, the weight of the riser is reduced, and the process yield is improved by 5-10%. Increase the processing procedure, save production time, reduce production cost, and improve casting modeling and production efficiency at the same time, do not use chill iron 8, and will not affect the compactness of the internal structure of the casting and the appearance quality of the casting.

But the above are only specific embodiments of the present invention, and should not limit the scope of the present invention, so the replacement of equivalent components, or the equivalent changes and modifications made according to the patent protection scope of the present invention, should be Still belong to the category covered by the claims of the present invention.

Claims (8)

1. one kind casting rising head, it is characterized in that：Provided with mold cavity, the casting rising head side is provided with riser neck, the rising head Neck on the inside of mold cavity with being connected.

2. casting rising head according to claim 1, it is characterised in that：The mold cavity includes upper mold cavity and lower mould Provided with casting die joint between cavity, upper mold cavity and the drag cavity, set on the inside of the upper mold cavity Have a casting rising head, the casting rising head side is provided with riser neck, the casting rising head includes upper rising head and lower rising head, it is described under emit Mouth is located at upper rising head bottom, and the upper rising head and lower rising head are located at upper mold cavity and drag inside cavity, the riser neck With being connected on the inside of upper mold cavity.

3. casting rising head according to claim 2, it is characterised in that：The riser neck is connected with drag inside cavities.

4. casting rising head according to claim 2, it is characterised in that：The riser neck and upper mold cavity and drag chamber Internal side is connected simultaneously.

5. casting rising head according to claim 2, it is characterised in that：The lower rising head is located at casting die joint bottom, institute It is circle to state lower rising head bottom, and the lower rising head bottom is less than riser neck bottom.

6. casting rising head according to claim 1, it is characterised in that：The riser neck is provided with riser neck afterbody, described to emit Mouth neck is by riser neck afterbody with being connected on the inside of mold cavity.

7. casting rising head according to claim 1, it is characterised in that：Casting sand core, institute are provided with the middle of the mold cavity Casting rising head is stated to be located inside casting sand core.

8. casting rising head according to claim 1, it is characterised in that：The riser neck is cone shape, the riser neck The diameter that afterbody connects position with upper mold cavity and drag cavity is connected less than riser neck with upper rising head and lower rising head side The diameter at position.