CN219274396U - Casting die of stainless steel impeller - Google Patents

Abstract

The utility model discloses a casting die of a stainless steel impeller, and belongs to the field of metallurgical casting. The mold comprises a mold body and a shaft core; the die body is internally provided with a die cavity, the lower part of the die body is provided with a through hole communicated with the die cavity, and the upper part of the die body is provided with a pouring channel communicated with the die cavity; the shaft core comprises an upper cone section, a middle section and a lower cylindrical section, and the upper cone section extends into the cavity from the through hole; the upper end of the die body is provided with at least one circle of blind riser, and the middle part of the upper end of the die body is provided with a necking riser with the diameter and the height larger than those of the blind riser. According to the utility model, the structure of the core casting mold is changed in consideration of the quality problem possibly occurring in the core preparation process, so that the high-quality core for casting the stainless steel impeller can be prepared.

Description

Casting die of stainless steel impeller

Technical Field

The utility model belongs to the field of metallurgical casting, and particularly relates to a casting die of a stainless steel impeller.

Background

At present, the existing steel parts are generally formed by stamping or casting, wherein the parts cast by stamping are subjected to larger external force in the stamping process, so that the quality of the parts is affected to a certain extent, and the problems of deformation, internal cracking and the like occur, and therefore, many existing factories can use casting for manufacturing the parts.

The mold is required to be used for casting the part by casting, but the use times of the mold are limited, and the mold cannot be used continuously after being cast for many times, so that the mold core produced by sand casting is used for replacing the mold in the prior art. Sand casting refers to a casting process that produces castings in sand molds. Steel, iron and most nonferrous alloy castings are obtained by sand casting methods. Because the molding materials used for sand casting are cheap and easy to obtain, the casting mould is simple and convenient to manufacture, and the casting mould is suitable for single-piece production, batch production and mass production of castings, thereby saving a large amount of cost.

For example, the Chinese patent application number is: CN201210553738.1, publication date: patent literature on the day of 2016 1 month 27 discloses a cylinder cap casting die in automobile parts field, including by first side form, second side form, first end form, second end form and die block enclose the metal form, and be located the inner chamber psammitolite in the die cavity of metal form, the top of first end form is equipped with the pouring basin, first side form with the second side form all embeds with the runner of pouring basin intercommunication, the bottom of runner be equipped with a plurality of with the gap type internal gate of die cavity intercommunication of metal form. The technical effects are as follows: the casting mold has the advantages of high compactness of the cylinder cover, good sealing performance, good mechanical performance and high dimensional accuracy. The utility model also discloses a cylinder cover casting method in the field of automobile parts, which comprises the steps of firstly placing an inner cavity sand core on a bottom die, then assembling a metal die, and then carrying out bilateral gravity casting.

The above scheme is to prepare the casting through the core, however, when the core is manufactured in the prior art, the cast core is easy to deform and shrink in the prior art due to the structure of the manufacturing mold and the matching process problem, so that the casting cast subsequently is influenced. At present, no casting mold has been developed in the prior art which can well solve the above problems and is specially used for preparing a core for casting an impeller having a structure as shown in fig. 1.

Disclosure of Invention

1. Problems to be solved

Aiming at the problem that the shrinkage cavity deformation condition during the preparation of the core is not well solved in the prior art and the casting mold is specially used for preparing the core for casting the impeller with the structure shown in the figure 1, the utility model provides the casting mold for the stainless steel impeller, and the structure of the casting mold for the core is changed in consideration of the quality problem possibly occurring in the preparation process of the core, so that the high-quality core for casting the stainless steel impeller can be prepared.

2. Technical proposal

In order to solve the problems, the utility model adopts the following technical scheme.

A casting mould of a stainless steel impeller comprises a mould body and a shaft core; the die body is internally provided with a die cavity, the lower part of the die body is provided with a through hole communicated with the die cavity, and the upper part of the die body is provided with a pouring channel communicated with the die cavity; the shaft core comprises an upper cone section, a middle section and a lower cylindrical section, and the upper cone section extends into the cavity from the through hole; the upper end of the die body is provided with at least one circle of blind riser, and the middle part of the upper end of the die body is provided with a necking riser with the diameter and the height larger than those of the blind riser.

As a further improvement of the technical scheme, the blind riser is provided with two circles, and the necking riser is positioned in the middle of the blind riser of the inner ring.

As a further improvement of the technical scheme, the blind riser is provided with an exhaust hole.

As a further improvement of the technical scheme, the upper part of the necking riser is provided with a heating cover.

As a further improvement of the technical scheme, the heating cover is provided with a layer of heat-insulating covering agent.

As a further improvement of the technical scheme, the top of the upper cone section of the shaft core is coated with a layer of chromite sand.

As a further improvement of the technical scheme, the side edge of the middle section of the shaft core is coated with a layer of chrome ore.

As a further improvement of the technical scheme, a chill is arranged in the side cavity of the lower cylindrical section of the shaft core.

As a further improvement of the technical scheme, the outside of the chill is coated with a layer of chromite sand.

3. Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

(1) According to the casting mold of the stainless steel impeller, a plurality of blind risers are uniformly arranged on the upper part of the mold body along the circumferential direction during casting, and the necking riser is arranged in the middle of the upper end of the mold body, so that the molding of the mold core can be greatly compensated during casting, the conditions of shrinkage cavity, shrinkage cavity and the like of the mold core are prevented, and the molding quality of the mold core is improved;

(2) According to the casting mold of the stainless steel impeller, the exhaust hole is formed in the common riser, the heating cover is arranged at the upper part of the necking riser, and the heat-insulating covering agent is arranged on the heating cover, so that the molding process of the mold core is smoother, the quality of the molded mold core is improved, and a casting of the stator pressing ring with high quality is finally prepared through the mold core;

(3) According to the casting mould of the stainless steel impeller, the chromium ore sand is coated on the ends of the shaft core, so that the problem that the casting material is difficult to take out after being bonded with the shaft core is avoided;

(4) According to the casting mold of the stainless steel impeller, the chill is arranged in the side cavity of the lower cylindrical section of the shaft core, so that the local cooling speed of a specific position of the core can be increased during casting, the mold is matched with the riser, the solidification sequence of each position of the core is controlled, the high-quality core is obtained, and a layer of chromite sand is coated on the outer side of the chill, so that the problem that a casting material is difficult to take out after being molded due to the fact that the casting material is adhered with the chill can be avoided.

Drawings

FIG. 1 is a schematic structural view of a prepared impeller; the method comprises the steps of carrying out a first treatment on the surface of the

FIG. 2 is a schematic illustration of a core structure being prepared;

FIG. 3 is a schematic structural view of a mold body;

FIG. 4 is a schematic cross-sectional view of the die body;

in the figure: 1. a die body; 11. blind riser; 12. necking down a riser; 2. a shaft core; 21. an upper cone section; 22. an intermediate section; 23. a lower cylindrical section.

Detailed Description

Exemplary embodiments of the present utility model are described in detail below. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the utility model, it is to be understood that other embodiments may be realized and that various changes to the utility model may be made without departing from the spirit and scope of the utility model. The following more detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model, as claimed, but is merely illustrative and not limiting of the utility model's features and characteristics in order to set forth the best mode of carrying out the utility model and to sufficiently enable those skilled in the art to practice the utility model. Accordingly, the scope of the utility model is limited only by the attached claims.

Example 1

A casting mould of a stainless steel impeller is used for metallurgical casting, a core of the cast impeller is prepared, the structure of the core is shown in figure 2, and the prepared impeller is shown in figure 1, so that the cost consumed by the mould is saved when the impeller is manufactured, and the specific structure and technical effects are described in detail below.

As shown in fig. 3 and 4, the mold includes a mold body 1 and a core 2. The die body 1 is internally provided with a die cavity, the lower part of the die body is provided with a through hole communicated with the die cavity, and the upper part of the die body is provided with a pouring channel communicated with the die cavity. The shaft core 2 comprises an upper cone section 21, a middle section 22 and a lower cylindrical section 23, wherein the upper cone section 21 extends into the die cavity from the through hole. The upper end of the die body 1 is provided with at least one circle of blind riser 11, the middle part of the upper end of the die body 1 is provided with a necking riser 12 with the diameter and the height being larger than those of the blind riser 11, in the embodiment, the blind riser 11 is provided with two circles, and the necking riser 12 is positioned in the middle of the inner circle of blind riser 11.

During casting, through the arrangement of the blind risers 11 and the necking risers 12 arranged on the upper part of the die body 1, the molding of the core can be greatly compensated during casting, the conditions of shrinkage cavity, shrinkage cavity and the like of the core are prevented, and the molding quality of the core is improved.

It should be noted that the blind riser 11 of this embodiment is provided with an exhaust hole, the upper portion of the necking riser 12 is provided with a heating cover, and the heating cover is provided with a layer of heat-insulating covering agent. Through the improvement of the riser structure, the molding process of the mold core can be smoother, the quality of the molded mold core is improved, and therefore the high-quality casting of the stator pressing ring is finally prepared through the mold core.

When the mold is used, the shaft core 2 is inserted into the cavity of the mold body 1 from the lower part of the mold body 1, and then is put into a sand box for injection casting of the core, and finally the core is formed. In the casting process, the casting material inevitably contacts the mandrel 2 in the forming process, and the mandrel is bonded with the mandrel 2 when the mandrel is formed, especially for a plurality of end positions of the mandrel 2, the mandrel is damaged when the mandrel is taken out due to serious bonding. Therefore, in this case, the top of the upper cone section 21 and the side of the middle section 22 of the shaft core 2 are both coated with a layer of chromite sand, so that the problem that the casting material is adhered to the shaft core 2 and is difficult to take out after molding is avoided.

In addition, in the embodiment, the chill is arranged in the side cavity of the lower cylindrical section 23 of the shaft core 2, so that the local cooling speed of a specific position of the core can be increased during casting, and the mold core is matched with a riser, so that the solidification sequence of each position of the core is controlled, and the high-quality core is obtained. The outside of the chill is coated with a layer of chromium ore sand at the same time, thereby avoiding the difficulty in taking out after molding caused by the adhesion of casting materials and the chill.

In summary, according to the casting mold for the stainless steel impeller of the embodiment, the structure of the mold core casting mold is changed in consideration of the quality problem possibly occurring in the process of preparing the mold core, so that the mold core for casting the stainless steel impeller with high quality can be prepared.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (9)

1. A casting die of stainless steel impeller, characterized in that: comprises a die body (1) and a shaft core (2); the die body (1) is internally provided with a die cavity, the lower part of the die body is provided with a through hole communicated with the die cavity, and the upper part of the die body is provided with a pouring channel communicated with the die cavity; the shaft core (2) comprises an upper cone section (21), a middle section (22) and a lower cylindrical section (23), and the upper cone section (21) extends into the cavity from the through hole; the upper end of the die body (1) is provided with at least one circle of blind riser (11), and the middle part of the upper end of the die body (1) is provided with a necking riser (12) with the diameter and the height being greater than those of the blind riser (11).

2. A casting die for a stainless steel impeller according to claim 1, wherein: the blind riser (11) is provided with two circles, and the necking riser (12) is positioned in the middle of the inner circle of blind riser (11).

3. A casting die for a stainless steel impeller according to claim 2, wherein: and an exhaust hole is formed in the blind riser (11).

4. A casting mold for a stainless steel impeller according to claim 3, wherein: the upper part of the necking riser (12) is provided with a heating cover.

5. A casting mold for a stainless steel impeller according to claim 4, wherein: the heating cover is provided with a layer of heat-insulating covering agent.

6. A casting die for a stainless steel impeller according to claim 1, wherein: the top of the upper cone section (21) of the shaft core (2) is coated with a layer of chrome sand.

7. A casting mold for a stainless steel impeller according to claim 6, wherein: the side of the middle section (22) of the shaft core (2) is coated with a layer of chrome ore sand.

8. A casting mold for a stainless steel impeller according to claim 7, wherein: and a chill is arranged in the side cavity of the lower cylindrical section (23) of the shaft core (2).

9. A casting die for a stainless steel impeller according to claim 8, wherein: and a layer of chromium ore sand is coated on the outer side of the chill.

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