阅读说明：本技术 一种采用壳型铸造铰耳的铸造工艺 (Casting process for casting hinge lug by adopting shell mold ) 是由 温文林 田慧 冯奇红 刘春晖 赵琰钰 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种采用壳型铸造铰耳的铸造工艺,该方法通过制壳机、射砂得到内腔为完整的铰耳形状的,厚度为10-15mm的铰耳壳性,然后直接把铰耳壳性放入砂箱,用铁砂将其埋住,浇注铁水铸出铰耳零件。本发明有效提高了铸件质量,百分百的消除了铰耳内部的缩松、缩孔,铸件成品率达到99％,同时与铁型覆砂工艺相比出品率由75％提高到90％以上,生产效率提高了2倍,用人数量由每班12人减少为6人、模具成本由20万降为2万,本发明成本低,且简单易行,适合绝大多数企业使用。(The invention discloses a casting process for casting a hinge lug by a shell mould, which comprises the steps of obtaining the hinge lug with the complete shape of the hinge lug and the thickness of 10-15mm by a shell making machine and sand shooting, directly putting the hinge lug into a sand box, burying the hinge lug by iron sand, and casting molten iron to cast a hinge lug part. The invention effectively improves the casting quality, eliminates shrinkage porosity and shrinkage cavity in the hinge lug by one hundred percent, has the casting yield of 99 percent, improves the yield from 75 percent to more than 90 percent compared with the iron mold sand-coating process, improves the production efficiency by 2 times, reduces the number of people to 6 from 12 people per shift, reduces the mold cost from 20 ten thousand to 2 ten thousand, has low cost, is simple and easy to implement, and is suitable for most enterprises.)

1. A casting process for casting a hinge lug by using a shell mould is characterized by comprising the following steps of:

(1) designing and manufacturing a set of lower model completely consistent with the shape of the hinge lug;

(2) designing and manufacturing a set of upper model matched with the lower model, wherein the matching gap between the upper model and the lower model is 10-15 mm;

(3) fixing the lower mold on a fixed plate of a moving vehicle of a shell making machine to be used as a moving mold, fixing the upper mold on the upper part of the shell making machine to be used as a fixed mold, closing the upper mold and the lower mold to be clamped, heating to the temperature of 200-;

(4) the lower model descends to a proper position and then is subjected to mold stripping, then the lower model is horizontally moved to one side, and two upper and lower shells with the upper and lower thicknesses of 10-15mm and a pouring cup shell are sequentially obtained, namely a mold cavity for mold closing and pouring is formed;

(5) after the upper shell and the lower shell are well bonded, clamping is carried out to form a hinge lug shell mold, and the hinge lug shell mold is buried into a sand box by iron sand in a vertical casting mode to wait for casting;

(6) proportioning the raw materials, putting the mixture into a medium-frequency electric furnace, heating, and smelting to obtain molten iron with the temperature of 1530 ℃;

(7) spheroidizing the molten iron by adopting a flushing method;

(8) pouring the molten iron after spheroidizing into the hinged lug shell mold cavity by a pouring cup, wherein the pouring time is 8 minutes, the pouring temperature is controlled at 1430 ℃, the required hinged lug blank part is obtained, and the casting is taken out by opening a sand box after heat preservation for 15 minutes.

2. The casting process of the shell mold casting hinge lug according to claim 1, wherein the designing and manufacturing of the lower mold and the designing and manufacturing of the upper mold matched with the lower mold are completely consistent with the shape of the hinge lug and comprise designing and manufacturing of a hinge lug tool mold, a pouring system, a sand shooting plate, a pressure head and a top plate.

3. The casting process using a shell casting hinge lug as recited in claim 1, wherein the shell making machine is a JFSS1080 model shell making machine.

Technical Field

The invention relates to a casting method of a mechanical part, in particular to a casting process for casting a hinge lug by using a shell mould.

Background

The hinge lugs with various shapes are widely applied in the existing industrial production, and the casting process of the hinge lugs generally adopts the sand-lined casting process of iron molds, and the process has the following defects in the casting process: 1. the process yield is low and is only 75%; 2. shrinkage porosity and shrinkage cavity are arranged in about 10 percent of castings; 3. the number of people used in each class is as many as 12; 4. the cost of the die is high, and each product exceeds 20 ten thousand yuan; 5. the production efficiency is low, and 10 furnaces are produced in each shift.

Disclosure of Invention

In view of the above, the present invention provides a casting process using a shell mold casting hinge lug, which can eliminate shrinkage porosity and shrinkage cavity inside the hinge lug, and can cast hinge lug parts in a large scale, with high precision and at low cost.

In order to achieve the purpose of the invention, the technical scheme is as follows:

a casting process for casting hinge lugs by using a shell mold comprises the following steps:

(1) designing and manufacturing a set of lower model completely consistent with the shape of the hinge lug;

(2) designing and manufacturing a set of upper model matched with the lower model, wherein the matching gap between the upper model and the lower model is 10-15 mm;

(3) fixing the lower mold on a fixed plate of a moving vehicle of a shell making machine to be used as a moving mold, fixing the upper mold on the upper part of the shell making machine to be used as a fixed mold, closing the upper mold and the lower mold to be clamped, heating to the temperature of 200-;

(4) the lower model descends to a proper position and then is subjected to mold stripping, then the lower model is horizontally moved to one side, and two upper and lower shells with the upper and lower thicknesses of 10-15mm and a pouring cup shell are sequentially obtained, namely a mold cavity for mold closing and pouring is formed;

(5) after the upper shell and the lower shell are well bonded, clamping is carried out to form a hinge lug shell mold, and the hinge lug shell mold is buried into a sand box by iron sand in a vertical casting mode to wait for casting;

(6) proportioning the raw materials, putting the mixture into a medium-frequency electric furnace, heating, and smelting to obtain molten iron with the temperature of 1530 ℃;

(7) spheroidizing the molten iron by adopting a flushing method;

(8) pouring the molten iron after spheroidizing into the hinged lug shell mold cavity by a pouring cup, wherein the pouring time is 8 minutes, the pouring temperature is controlled at 1430 ℃, the required hinged lug blank part is obtained, and the casting is taken out by opening a sand box after heat preservation for 15 minutes.

Preferably, the design and manufacture of a set of lower model completely consistent with the shape of the hinge lug and the design and manufacture of a set of upper model matched with the lower model comprise a design and manufacture hinge lug tool mold, a pouring system, a sand shooting plate, a pressure head and a top plate.

Preferably, the model of the shell making machine is JFSS 1080.

Compared with the prior sand lining technology for the iron mold, the invention has the following beneficial effects: the defects of shrinkage porosity and shrinkage cavity inside the hinge lug are eliminated by 100 percent; the internal structure of the hinge lug is compact, the spheroidization grade is 1-2 grade, the graphite size is 6-8 grade, and the roughness of the casting can reach Ra25 mu m; the finished product rate of the casting reaches 99 percent, and simultaneously, compared with the sand lined iron mold, the production efficiency is improved by 2 times, the process yield reaches 90 percent, the number of workers is reduced from 12 workers per shift to 6 workers, the mold cost is reduced from 20 ten thousand to 2 ten thousand, and the invention has low cost and simple and easy operation, and is suitable for most enterprises.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the lower model of the present invention;

FIG. 2 is a schematic view of an upper mold in the present invention;

FIG. 3 is a schematic casting diagram of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.