CN113634714B

CN113634714B - Casting and forming process for castings

Info

Publication number: CN113634714B
Application number: CN202110928550.XA
Authority: CN
Inventors: 马广华; 吕芳遂; 于祥增
Original assignee: DALIAN JINHE CASTING CO LTD
Current assignee: DALIAN JINHE CASTING CO LTD
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2023-04-18
Anticipated expiration: 2041-08-13
Also published as: CN113634714A

Abstract

The invention relates to a casting and forming process for a casting, which is applied to forming and forming of an L-shaped casting and comprises the following steps: the first step is as follows: putting a wood mold into the sand box; the second step is that: pouring molding sand into the sand box in which the wood mold is placed; the third step: drying and shaping the sand box completed in the second step; the fourth step: hoisting to remove the wood mold to form a sand cavity; the fifth step: placing a prefabricated counterweight sand core in a part of the sand cavity formed in the fourth step; and a sixth step: and pouring molten iron in the other part of the sand cavity except the position where the counterweight sand core is placed in the fifth step, and finally forming the required L-shaped casting in a molten iron area after forming. The process adopts a special structure and a counterweight form in the wood mold lifting, so that the two sides are stable during the lifting, the damage of sand molds and wood molds is avoided, the surface quality of castings is improved, and the service life of the wood molds is prolonged.

Description

Casting and forming process for castings

Technical Field

The invention relates to a casting and molding process for a casting, which is applied to molding and molding of an L-shaped casting and belongs to the technical field of casting.

Background

In the L-shaped casting molding, a wood mold needs to be shaped before molten iron is poured into a sand box. When the wood model is lifted out (lifted at one point or two points), due to the shape relationship of the L-shaped casting, the two sides of the lifting model are unstable, the wood model is deviated to one side with heavier gravity center, and the side with lighter gravity center is tilted; this causes difficulty in mold setting, that is, in the process of setting the wood mold, the sand mold or the wood mold may be damaged, and the service life of the wood mold may be reduced.

If the method aims to achieve the stability of the L-shaped casting in the wood mold forming in the prior art and ensure that the casting is integrally taken out (cannot be pulled to be broken), the L-shaped casting can be conveniently and smoothly formed; the existing method comprises the following steps: the wooden shape of the L-shaped casting is divided into two "straight line" sections, i.e. at the corners of the "L", and lifting points can be applied separately when lifting. The method has the problems that the two straight-line sections are connected by the connecting piece, so that the two straight-line sections need to be separated and pulled out during hoisting, and compared with the L-shaped integral pulling-out mode, the mode is necessarily too complicated in operation, and the lifting efficiency is low.

Disclosure of Invention

In view of the technical problems, the invention aims to provide a casting and lifting process, which is characterized in that when a wood mold is manufactured, a counterweight core with the weight equivalent to that of the side with the heavy center is manufactured on the side with the light center, so that the two sides are stable when the wood mold is lifted, the damage of a sand mold and the wood mold is avoided, the surface quality of the casting is improved, and the service life of the wood mold is prolonged.

In order to achieve the purpose, the invention adopts the technical scheme that: the casting and forming process for the casting comprises the following steps:

the first step is as follows: putting wood molds into the sand box;

the second step is that: pouring molding sand into the sand box in which the wood mold is placed;

the third step: drying and shaping the sand box finished in the second step;

the fourth step: hoisting to remove the wood mold to form a sand cavity;

the fifth step: placing a prefabricated counterweight sand core in a part of the sand cavity formed in the fourth step;

and a sixth step: and pouring molten iron in the other part of the sand cavity except the position where the counterweight sand core is placed in the fifth step, and finally forming the required L-shaped casting in a molten iron area after forming.

Furthermore, the wood model in the second step is in an integrally formed L shape with one straight line section;

the L-shaped part of the wood mold is used for forming a sand cavity in the shape of a finished casting in the sand box, and the straight-line part of the wood mold is used for forming a sand cavity in the shape of a counterweight sand core in the sand box;

further, the L-shaped portion of the wood type includes: the wood type straight line section part is the same as the extending end of the L-shaped part; one end of the horizontal end of the L-shaped part is connected with the extending end, and the other end of the horizontal end is a free end; one end of the extending end of the straight line section is connected with the free end of the horizontal end;

the wood type that adopts integrated into one piece can guarantee that both sides are steady when the wood type plays the type, and the atress of wood type both sides is even to realize wholly taking out.

Further, the shape of the counterweight sand core in the fifth step is fitted with the shape of the part of the wood type sand cavity for placing the counterweight sand core;

because the casting with the L-shaped structure is finally formed in the sand cavity, the counterweight sand core is occupied in the sand cavity for finally forming the L-shaped sand cavity.

The invention has the beneficial effects that:

the process adopts a special structure and a counterweight form in the wood mold lifting, so that the two sides are stable during the lifting, the damage of sand molds and wood molds is avoided, the surface quality of castings is improved, and the service life of the wood molds is prolonged.

Drawings

FIG. 1 is a schematic view showing a state where a wood pattern is placed in a flask.

Fig. 2 is a schematic structural diagram of a sand cavity formed after the wood-type mold is raised.

Fig. 3 is a schematic view showing a state where a sand core is placed and arranged in the sand chamber.

Fig. 4 is a schematic view of a wood-type structure according to the present invention.

In the figure, 1, a wood mold, 2, a sand box, 3, a counterweight sand core, 1.1, an L-shaped part extending end, 1.2, an L-shaped part extending horizontal end, 1.3 and a straight line section extending end.

Detailed Description

The invention is further explained below with reference to the drawings.

As shown in the figure, the casting and forming process comprises the following steps:

the first step is as follows: putting the wood pattern 1 into the sand box 2;

the sand box 2 is provided with an opening at the top and a grid-shaped hollow at the bottom; the wood pattern 1 is placed in the sand box 2 from the top (opening) thereof, as shown in fig. 1;

the second step: pouring molding sand into the sand box 2 in which the wood pattern 1 is placed;

turning the sand box 2 finished in the first step for 180 degrees, wherein the grids of the turned sand box 2 are hollowed upwards, and then pouring molding sand into the grids of the sand box 2;

the third step: drying and shaping the sand box 2 completed in the second step;

after drying, turning the sand box 2 for 180 degrees, namely, turning the sand box 2 to a state that the opening is upward and the grids are hollowed downward;

the fourth step: hoisting and removing the wood model 1 to form a sand cavity;

lifting and removing the wood pattern 1 by using a lifting hook, and forming a sand cavity with the shape opposite to that of the wood pattern 1 after removing, wherein the sand cavity comprises a sand cavity part with the shape of a finished casting and a residual sand cavity part thereof, and the sand cavity part is shown in FIG. 2;

the fifth step: filling the prefabricated counterweight sand core 3 into the residual sand cavity part in the fourth step, as shown in fig. 3;

and a sixth step: and after the counterweight sand core 3 is placed, pouring molten iron into the sand cavity, and finally forming a required L-shaped casting in a molten iron area after the molten iron is formed.

In the above working procedures, the involved wood model 1 is in an integrally formed L shape with a straight line section;

the L-shaped part of the wood pattern 1 is used for forming a sand cavity in the shape of a finished casting in the sand box 2, and the straight-line part of the wood pattern 1 is used for forming a sand cavity in the shape of placing a counterweight sand core 3 in the sand box 2;

the L-shaped portion of the wood pattern 1 includes: an extending end 1.1 and a horizontal end 1.2, wherein the straight line section part of the wood type 1 is the same as the extending end 1.1 of the L-shaped part; one end of a horizontal end 1.2 of the L-shaped part is connected with the extending end, and the other end of the horizontal end 1.2 is a free end; one end of the straight-line segment part extending into the end 1.3 is connected with the free end of the horizontal end 1.2; as shown in particular in fig. 4.

Claims

1. The casting and forming process of the casting is characterized in that: the method comprises the following steps:

the first step is as follows: putting a wood mold into the sand box;

the third step: drying and shaping the sand box completed in the second step;

the fourth step: hoisting to remove the wood mold to form a sand cavity;

and a sixth step: pouring molten iron in the other part of the sand cavity except the position where the counterweight sand core is placed in the fifth step, and finally forming a required L-shaped casting in a molten iron area after forming; the wood shape in the second step is in an L shape with a straight line segment; the L-shaped shape and the straight line section shape of the wood type are integrally formed; the L-shaped part of the wood pattern comprises: the straight line section part of the wood shape is the same as the extending end of the L-shaped part; one end of the horizontal end of the L-shaped part is connected with the extending end, and the other end of the horizontal end is a free end; one end of the extending end of the straight line section is connected with the free end of the horizontal end; and the shape of the counterweight sand core in the fifth step is attached to the shape of the part of the wood type sand cavity for placing the counterweight sand core.