CN219254072U

CN219254072U - Pipe die for centrifugal casting and centrifugal casting equipment

Info

Publication number: CN219254072U
Application number: CN202223506380.5U
Authority: CN
Inventors: 王海朝; 马涛; 陶幸珍; 刘春光; 杨硬硬; 姚光宇; 霍刚
Original assignee: Guoming Ductile Iron Pipes Co Ltd
Current assignee: Guoming Ductile Iron Pipes Co Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-06-27
Anticipated expiration: 2032-12-28

Abstract

The pipe die for centrifugal casting comprises a base steel pipe layer serving as an outer supporting layer, a heat-resistant die steel layer serving as a first inner working layer and a heat-resistant metal deposition layer serving as a second inner working layer, wherein the heat-resistant die steel layer is compounded in the inner layer of the base steel pipe layer in a casting mode, and the heat-resistant metal deposition layer is compounded in the inner layer of the heat-resistant die steel layer in an additive deposition mode. The heat-resistant metal deposition layer material is preferably the same as the heat-resistant die steel layer material. The heat-resistant die steel layer is compounded on the inner layer of the matrix steel pipe layer in a casting mode, can be manufactured rapidly at low cost, and the heat-resistant metal deposition layer is compounded on the inner layer of the heat-resistant die steel layer in an additive deposition mode.

Description

Pipe die for centrifugal casting and centrifugal casting equipment

Technical Field

The utility model relates to the technical field of manufacturing of centrifugal casting molds, in particular to a pipe mold for centrifugal casting and centrifugal casting equipment.

Background

The pipe die used for centrifugally casting the ductile iron pipe in industry is a cast product, and is obtained by centrifugal casting by using another metal die in a similar production manner as the pipe die is used for centrifugally casting the ductile iron pipe.

Because the pipe die is directly contacted with high-temperature molten iron and repeatedly subjected to thermal shock, the service life is short, and in order to improve the service life of the pipe die, the heat-resistant die steel is considered to be adopted for manufacturing the pipe die, but the cost is high, and the scheme adopted at present is that a layer of heat-resistant die steel is compounded in the inner layer of a matrix steel pipe, so that the whole pipe die still takes the matrix steel pipe as a main structural material, and only the working layer of the pipe die is manufactured into a heat-resistant die steel layer.

The method specifically comprises the steps of injecting an outer layer pipe wall material into a metal mold, casting heat-resistant mold steel melt on the inner surface of the outer layer pipe wall material, and promoting the formation of a composite layer by means of the rotary centrifugal action of the metal mold. In producing a pipe die in this manner, as shown in fig. 1 (a), theoretically, a desired uniform interface B should be formed between the base steel pipe layer 10 as the outer support layer and the heat-resistant die steel layer 20 as the inner working layer, but since both the base steel pipe layer 10 and the heat-resistant die steel layer 20 are obtained by solidification of molten metal, the material of the heat-resistant die steel layer 20 is injected while the material of the base steel pipe layer 10 is not yet solidified, and the latter injection has a remelting effect against the former to be solidified, so that the interface between the two layers actually obtained may be an uneven interface B' as shown in fig. 1 (B).

It can be seen that once the uneven interface B' shown in (B) of fig. 1 is present between the base steel pipe layer 10 and the heat-resistant die steel layer 20, the material thickness of the local heat-resistant die steel layer 20 is easily insufficient, and even the material of the base steel pipe layer 10 is locally exposed, which cannot play the role of the heat-resistant die steel layer 20, and thus cannot guarantee the normal service life of the pipe die.

Disclosure of Invention

In order to solve the problems in the background technology, the utility model provides the pipe die for centrifugal casting, which is characterized in that an inner working layer of the pipe die with a composite layer structure is divided into a casting layer and an additive deposition layer, and the additive deposition layer ensures the minimum thickness of a heat-resistant working layer, so that the inner layer of the pipe die is not partially lost even if the casting layer is uneven, and the service life of the pipe die is prolonged when the pipe die is used for centrifugal casting equipment.

The aim of the utility model is achieved by the following technical scheme.

The pipe die for centrifugal casting comprises a base steel pipe layer serving as an outer supporting layer, a heat-resistant die steel layer serving as a first inner working layer and a heat-resistant metal deposition layer serving as a second inner working layer, wherein the heat-resistant die steel layer is compounded in the inner layer of the base steel pipe layer in a casting mode, and the heat-resistant metal deposition layer is compounded in the inner layer of the heat-resistant die steel layer in an additive deposition mode.

Further, as described above, the heat-resistant metal deposit layer material is the same as the heat-resistant die steel layer material.

Further, as described above, the material of the base steel pipe layer is a general heat-resistant steel material.

Further, as described above, the thickness of the base steel pipe layer is larger than the sum of the thicknesses of the heat-resistant die steel layer and the heat-resistant metal deposition layer.

Further, as described above, the heat-resistant die steel layer has a thickness greater than that of the heat-resistant metal deposit layer.

Further, as described above, the thickness of the heat-resistant die steel layer is not less than 22mm and the thickness of the heat-resistant metal deposition layer is not less than 6mm.

Further, as described above, the thickness of the base steel pipe layer is not less than 40mm.

Further, as described above, the end portion of the pipe die is a flared portion having an arc-shaped cross section.

Further, as described above, the pipe die for centrifugal casting is coated with a heat-resistant paint coating on the inner layer of the heat-resistant metal deposit layer.

The utility model also provides a centrifugal casting device, which uses the pipe die for centrifugal casting.

The utility model has the beneficial effects that:

the inner layer of the matrix steel pipe layer comprises the heat-resistant die steel layer serving as the first inner working layer and the heat-resistant metal deposition layer serving as the second inner working layer, the heat-resistant die steel layer is compounded on the inner layer of the matrix steel pipe layer in a casting mode, the heat-resistant die steel can be quickly manufactured at low cost, and the heat-resistant metal deposition layer is compounded on the inner layer of the heat-resistant die steel layer in an additive deposition mode.

The composite structure pipe die is used for centrifugal casting equipment to produce spheroidal graphite cast pipe products, and the single-die yield can be increased by more than 15%, which means that the service life is greatly prolonged.

Drawings

The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. In the drawings:

fig. 1 is a schematic diagram of a composite layer structure pipe die prepared by a centrifugal composite method in the prior art, wherein:

(a) A composite layer theoretical uniform interface is shown; (b) shows the actual non-uniform interface of the composite layer.

Fig. 2 is a schematic diagram of a tube die for centrifugal casting according to an embodiment of the present utility model.

FIG. 3 is a schematic diagram of a centrifugal casting tube mold according to a second embodiment of the present utility model.

The components represented by the reference numerals in the figures are:

10-a matrix steel pipe layer; 20-a heat-resistant die steel layer; 30-heat resistant metal deposition layer.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art, and the disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein.

Examples

As shown in fig. 2, the pipe die for centrifugal casting of the present embodiment includes a base steel pipe layer 10 as an outer support layer, the base steel pipe layer 10 being a casting layer, and further includes a heat-resistant die steel layer 20 as a first inner working layer and a heat-resistant metal deposition layer 30 as a second inner working layer, the heat-resistant die steel layer 20 being compounded in the inner layer of the base steel pipe layer 10 in a casting manner, and the heat-resistant metal deposition layer 30 being compounded in the inner layer of the heat-resistant die steel layer 20 in an additive deposition manner.

In the prior art described in fig. 1, the heat-resistant die steel layer 20 is directly cast to the matrix steel pipe layer 10 by adopting a centrifugal casting compounding mode, and an uneven interface B' is formed due to the hot melting effect between two layers of metal, in this case, if the heat-resistant die steel layer 20 is thin, even if the material of the matrix steel pipe layer 10 is partially exposed, the inner working layer is divided into a first inner working layer and a second inner working layer by adopting the means provided by the embodiment, the first inner working layer is still the heat-resistant die steel layer 20, the manufacturing cost is ensured in this way, the production speed is high, the second inner working layer is designed as the heat-resistant metal deposition layer 30, and the heat-resistant metal deposition layer 30 is compounded in the inner layer of the heat-resistant die steel layer 20 in an additive deposition mode, so that a part of the thickness of the whole inner working layer is shared, and the thickness of the heat-resistant die steel layer can be completely covered due to the thickness uniformity of the thickness of the first layer, so that the heat-resistant die steel layer 20 is not lost even if the thickness of the first layer is uneven.

In this embodiment, the heat-resistant metal deposition layer 30 is preferably made of the same material as the heat-resistant die steel layer 20, and is made of a known heat-resistant die steel material such as 20CrMoWV, but may be made of a different material. The material of the base steel pipe layer 10 can be a common heat-resistant steel material or a low-alloy heat-resistant steel material with a price lower than 20CrMoWV, and can be selected from the prior art according to technical requirements and cost.

Since the base steel pipe layer 10 as the outer support layer in the pipe die for centrifugal casting of the present embodiment is a main body material layer, the thickness of the base steel pipe layer 10 is generally larger than the sum of the thicknesses of the heat-resistant die steel layer 20 and the heat-resistant metal deposition layer 30. In practical applications, the thickness of the base steel pipe layer 10 is generally not less than 40mm.

Since the heat-resistant metal deposition layer 30 is compounded in the inner layer of the heat-resistant die steel layer 20 in an additive deposition manner, only a part of the thickness of the whole inner working layer is shared, so that the thickness of the heat-resistant metal deposition layer cannot be too thick, and at least the thickness of the heat-resistant die steel layer 20 is larger than the thickness of the heat-resistant metal deposition layer 30 in an additive deposition manner. In practical use, the thickness of the heat-resistant die steel layer 20 is generally not less than 22mm, and the thickness of the heat-resistant metal deposition layer 30 is generally not less than 6mm.

As a most important application, the pipe die for centrifugal casting provided in the present embodiment is used in a centrifugal casting apparatus, and therefore, the present utility model also protects a centrifugal casting apparatus, and the pipe die for centrifugal casting described in the present embodiment is used for casting engineering products such as ductile cast iron pipes.

As shown in fig. 3, when the pipe die for centrifugal casting is applied to the scheme of the present utility model, the end portion of the pipe die is a flaring portion with a generally arc-shaped cross section, and the heat-resistant metal deposition layer 30 is preferably deposited on the inner wall of the pipe die after the flaring process is completed, that is, the heat-resistant die steel layer 20 is cast on the base steel pipe layer 10 by adopting a centrifugal casting compounding mode, and then flared, and finally the heat-resistant metal deposition layer 30 is deposited, so that the risk of thinning the heat-resistant die steel layer 20 and being displaced by the material of the base steel pipe layer 10 is further increased due to the plastic deformation of the composite structure of the base steel pipe layer 10 and the heat-resistant die steel layer 20 in the flaring process, and the risk of depositing the heat-resistant metal deposition layer 30 after the flaring can be further eliminated.

In addition, as common knowledge in the art, the pipe die for centrifugal casting of the present embodiment is coated with the heat-resistant paint coating on the inner layer when used on the centrifugal casting apparatus, and therefore, the pipe die for centrifugal casting of the present embodiment may be coated with the heat-resistant paint coating on the inner layer of the heat-resistant metal deposition layer 30, and the heat-resistant metal deposition layer 30 is not particularly required for the heat-resistant paint coating, and a coating material of the related art may be used.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. The pipe die for centrifugal casting comprises a substrate steel pipe layer (10) serving as an outer supporting layer, wherein the substrate steel pipe layer (10) is a casting layer, and is characterized by further comprising a heat-resistant die steel layer (20) serving as a first inner working layer and a heat-resistant metal deposition layer (30) serving as a second inner working layer, wherein the heat-resistant die steel layer (20) is compounded on the inner layer of the substrate steel pipe layer (10) in a casting mode, and the heat-resistant metal deposition layer (30) is compounded on the inner layer of the heat-resistant die steel layer (20) in an additive deposition mode.

2. A pipe die for centrifugal casting according to claim 1, wherein the heat-resistant metal deposition layer (30) is the same material as the heat-resistant die steel layer (20).

3. A pipe die for centrifugal casting according to claim 1, characterized in that the material of the base steel pipe layer (10) is a normal heat-resistant steel material.

4. A pipe die for centrifugal casting according to claim 1, wherein the thickness of the base steel pipe layer (10) is greater than the sum of the thicknesses of the heat-resistant die steel layer (20) and the heat-resistant metal deposition layer (30).

5. A pipe die for centrifugal casting according to claim 1, wherein the thickness of the heat resistant die steel layer (20) is greater than the thickness of the heat resistant metal deposit layer (30).

6. A pipe die for centrifugal casting according to claim 5, wherein the thickness of the heat-resistant die steel layer (20) is not less than 22mm, and the thickness of the heat-resistant metal deposition layer (30) is not less than 6mm.

7. A pipe die for centrifugal casting according to claim 6, wherein the thickness of the base steel pipe layer (10) is not less than 40mm.

8. A pipe die for centrifugal casting according to claim 1, wherein an end portion of the pipe die is a flared portion of an arc-shaped cross section.

9. A pipe die for centrifugal casting according to claim 1, characterized in that a heat-resistant paint coating is applied to the inner layer of the heat-resistant metal deposit layer (30).

10. A centrifugal casting apparatus using a centrifugal casting die, wherein the centrifugal casting die is the centrifugal casting die according to any one of claims 1 to 8.