阅读说明：本技术 一种提高砂型铸造补缩效率的有效方法 (Effective method for improving feeding efficiency of sand casting ) 是由 嵇振桓 季超 于 2020-12-08 设计创作，主要内容包括：本发明公开了一种提高砂型铸造补缩效率的有效方法,涉及砂型铸造技术领域,具体包括以下步骤：(1)铸造工艺；(2)产品检测。该提高砂型铸造补缩效率的有效方法,更改砂芯结构,浇注时,在补缩通道较小的位置a,同步引入一股金属液b,利用金属液b自身的热量对补缩通道进行加热,确保补缩通道处凝固更慢,同时为了不影响产品结构,还将金属液b与产品表面隔离4-6mm,在该新的铸造工艺条件下,产品检测结构合格,该提高砂型铸造补缩效率的有效方法有效提高补缩效率,减小因凝固顺序差异而导致的缩松问题,可以有效提高产品的内部质量,减小大多数因缩松引起的质量问题。(The invention discloses an effective method for improving feeding efficiency of sand casting, which relates to the technical field of sand casting and specifically comprises the following steps: (1) casting process; (2) and (5) product detection. The effective method for improving the feeding efficiency of sand casting comprises the steps of changing a sand core structure, introducing a strand of molten metal b synchronously at a position a with a smaller feeding channel during pouring, heating the feeding channel by utilizing the heat of the molten metal b, ensuring that the feeding channel is solidified more slowly, and simultaneously isolating the molten metal b from the surface of a product by 4-6mm in order not to influence the structure of the product.)

1. An effective method for improving feeding efficiency of sand casting comprises the following steps:

(1) casting process;

(2) and (5) product detection.

2. An effective method for improving the feeding efficiency of sand casting according to claim 1, characterized in that: the casting process comprises the following specific steps:

(1) casting a shell mold, wherein all shapes are formed by precoated sand, and the surface of an inner cavity is coated with paint;

(2) arranging a dead head and a chill at the position of a product plane;

(3) and (3) synchronously introducing a molten metal b at the position a with a smaller feeding channel during pouring.

3. An effective method for improving the feeding efficiency of sand casting according to claim 2, characterized in that: and the metal liquid b is separated from the surface of the product by 4-6 mm.

4. An effective method for improving the feeding efficiency of sand casting according to claim 3, characterized in that: and the metal liquid b and the surface of the product are covered and isolated by a film.

5. An effective method for improving the feeding efficiency of sand casting according to claim 4, characterized in that: the film is a polytetrafluoroethylene iron teflon ptfe film.

6. An effective method for improving the feeding efficiency of sand casting according to claim 1, characterized in that: the specific process of product detection is as follows:

(1) cutting and sectioning the product by using a linear cutting method;

(2) and dyeing and detecting a cut surface.

Technical Field

The invention relates to the technical field of sand casting, in particular to an effective method for improving feeding efficiency of sand casting.

Background

The existing cast steel product has high molten steel shrinkage and is easy to generate shrinkage porosity, and a channel required by feeding is large, but under the market demand of light weight of automobiles, the casting feasibility is difficult to be completely considered in the design of customers, so that the feeding channel is insufficient, and under the condition, the inside of the product is difficult to feed, and the shrinkage porosity problem cannot be solved.

Aiming at the existing turbine shell product, the structure is complex, the wall thickness is uneven, the feeding channel is insufficient, feeding can not be carried out according to the conventional thermal pitch circle principle, and the sequential solidification gradient can not be ensured.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an effective method for improving the feeding efficiency of sand casting, and solves the problems in the background art.

In order to achieve the purpose, the invention is realized by the following technical scheme: an effective method for improving feeding efficiency of sand casting comprises the following steps:

(1) casting process;

(2) and (5) product detection.

Optionally, the casting process specifically comprises the following steps:

(1) casting a shell mold, wherein all shapes are formed by precoated sand, and the surface of an inner cavity is coated with paint;

(2) arranging a dead head and a chill at the position of a product plane;

(3) and (3) synchronously introducing a molten metal b at the position a with a smaller feeding channel during pouring.

Optionally, the metal liquid b is separated from the surface of the product by 4-6 mm.

Optionally, the metal liquid b and the surface of the product are covered and isolated by a film.

Optionally, the film is a teflon ptfe film.

Optionally, the specific process of product detection is as follows:

(1) cutting and sectioning the product by using a linear cutting method;

(2) and dyeing and detecting a cut surface.

The invention provides an effective method for improving the feeding efficiency of sand casting, which has the following beneficial effects: change psammitolite structure, during the pouring, at the less position an of feeding passageway, introduce one molten metal b in step, utilize the heat of molten metal b self to heat feeding passageway, ensure that feeding passageway department solidifies more slowly, effectively improve feeding efficiency, reduce the shrinkage porosity problem because of solidifying the sequence difference and leading to, can effectively improve the internal quality of product, reduce the quality problems that most arouse because of the shrinkage porosity.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example 1

An effective method for improving feeding efficiency of sand casting comprises the following steps:

(1) and (3) casting process:

a. the shell mold casting is carried out, all shapes are formed by precoated sand, the surface of an inner cavity is coated with paint so as to ensure the surface roughness, and meanwhile, the paint can generate a certain chilling effect on a casting;

b. arranging a dead head and a chill at the plane position of a product, controlling the cooling speed of the product and ensuring sequential solidification;

c. during pouring, synchronously introducing a strand of molten metal b at a position a with a smaller feeding channel, wherein the molten metal b is isolated from the surface of a product by 4mm, further, the molten metal b is isolated from the surface of the product by adopting a film for covering, and further, the film is a polytetrafluoroethylene iron teflon ptfe film;

(2) product detection:

(1) cutting and sectioning the product by using a linear cutting method;

(2) and dyeing and detecting a cut surface.

Example 2

An effective method for improving feeding efficiency of sand casting comprises the following steps:

(2) and (3) casting process:

a. the shell mold casting is carried out, all shapes are formed by precoated sand, the surface of an inner cavity is coated with paint so as to ensure the surface roughness, and meanwhile, the paint can generate a certain chilling effect on a casting;

b. arranging a dead head and a chill at the plane position of a product, controlling the cooling speed of the product and ensuring sequential solidification;

c. during pouring, synchronously introducing a strand of molten metal b at a position a with a smaller feeding channel, wherein the molten metal b is isolated from the surface of a product by 5mm, further, the molten metal b is isolated from the surface of the product by adopting a film for covering, and further, the film is a polytetrafluoroethylene iron teflon ptfe film;

(2) product detection:

(1) cutting and sectioning the product by using a linear cutting method;

(2) and dyeing and detecting a cut surface.

Example 3

An effective method for improving feeding efficiency of sand casting comprises the following steps:

(3) and (3) casting process:

a. the shell mold casting is carried out, all shapes are formed by precoated sand, the surface of an inner cavity is coated with paint so as to ensure the surface roughness, and meanwhile, the paint can generate a certain chilling effect on a casting;

b. arranging a dead head and a chill at the plane position of a product, controlling the cooling speed of the product and ensuring sequential solidification;

c. during pouring, synchronously introducing a strand of molten metal b at a position a with a smaller feeding channel, wherein the molten metal b is isolated from the surface of a product by 6mm, further, the molten metal b is isolated from the surface of the product by adopting a film for covering, and further, the film is a polytetrafluoroethylene iron teflon ptfe film;

(2) product detection:

(1) cutting and sectioning the product by using a linear cutting method;

(2) and dyeing and detecting a cut surface.

In summary, in the conventional casting process (without molten metal introduction), the feeder head cannot effectively feed the shrinkage cavity due to the product structure, a position a with a smaller feeding channel exists between the feeder head and the shrinkage cavity, the position can be solidified first, so that the feeding channel is cut off, the effective method for improving the feeding efficiency of sand casting changes the structure of the sand core, and when pouring, synchronously introducing a strand of molten metal b at a position a with a smaller feeding channel, heating the feeding channel by utilizing the heat of the molten metal b to ensure that the feeding channel is solidified more slowly, meanwhile, in order to not influence the structure of the product, the metal liquid b is isolated from the surface of the product by 4-6mm, under the new casting process condition, the product detection structure is qualified, the effective method for improving the feeding efficiency of sand casting can effectively improve the internal quality of products and reduce most of quality problems caused by shrinkage porosity.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.