阅读说明：本技术 一种铸造模壳装箱焙烧工艺 (Casting formwork boxing roasting process ) 是由 周源 于 2019-10-21 设计创作，主要内容包括：本发明提供一种铸造模壳装箱焙烧工艺,包括以下步骤：提供铸造模壳、砂箱和一端开口的防护罩,铸造模壳之上设置有浇口杯,将防护罩盖合于浇口杯杯口处,再将铸造模壳放置于砂箱以内,将耐火砂填充至砂箱以内的空隙中,再将铸造模壳取出,取下防护罩,使用耐火材料覆盖浇口杯杯口处,对铸造模壳进行高温焙烧后获得型壳。采用本发明的技术方案,通过在将铸造模壳装入砂箱之前,预先在其浇口杯杯口处盖合由天然橡胶材料制成的防护罩,有效避免了耐火砂经由浇口杯进入铸造模壳内部,为提高最终铸件的成型质量奠定了基础,本发明优选在防护罩罩口边沿设置有卷边,进一步提升了防护罩的防护效果,有利于提高最终铸件的成型质量。(The invention provides a casting formwork casing roasting process, which comprises the following steps: providing a casting mould shell, a sand box and a protective cover with an opening at one end, arranging a sprue cup on the casting mould shell, covering the protective cover at the cup opening of the sprue cup, placing the casting mould shell in the sand box, filling refractory sand into a gap in the sand box, taking out the casting mould shell, taking down the protective cover, covering the cup opening of the sprue cup with refractory materials, and roasting the casting mould shell at high temperature to obtain the mould shell. By adopting the technical scheme of the invention, the protective cover made of natural rubber material is covered at the cup opening of the pouring cup before the casting mould shell is arranged in the sand box, so that the refractory sand is effectively prevented from entering the casting mould shell through the pouring cup, and a foundation is laid for improving the forming quality of a final casting.)

1. A casting formwork boxing roasting process is characterized in that: the method comprises the following steps:

providing a casting mould shell (1), a sand box (2) and a protective cover (3) with an opening at one end, wherein a sprue cup is arranged on the casting mould shell (1), the protective cover (3) is covered at the sprue cup, the casting mould shell (1) is placed in the sand box (2), refractory sand (4) is filled in a gap in the sand box (2), the casting mould shell (1) is taken out, the protective cover (3) is taken down, the sprue cup is covered by refractory materials, and the casting mould shell (1) is roasted at high temperature to obtain a mould shell.

2. A casting formwork casing baking process as claimed in claim 1, wherein: the casting formwork boxing roasting process further comprises the following steps:

after filling the refractory sand (4) into the void inside the flask (2), the relative height between the surface of the refractory sand (4) relative to the edge of the shield mouth of the shield (3) is made greater than zero.

3. A casting formwork casing baking process as claimed in claim 1, wherein: the edge of the opening of the protective cover (3) is also provided with a turned edge (31) which turns towards the outer peripheral surface of the protective cover.

4. A casting formwork casing baking process as claimed in claim 3, wherein: the height of the curled edge (31) is less than one fifth of the height of the protective cover (3).

5. A casting formwork casing baking process as claimed in claim 1, wherein: the protective cover (3) is made of natural rubber.

6. A casting formwork casing baking process as claimed in claim 1, wherein: the protective cover (3) is in a frustum shape.

7. A casting formwork casing baking process as claimed in claim 1, wherein: the refractory material is asbestos.

8. A casting formwork casing baking process as claimed in claim 1, wherein: the sand box (2) is made of iron.

Technical Field

The invention relates to the technical field of casting processes, in particular to a casting formwork boxing and roasting process.

Background

The roasting of the shell is one of the important processes of investment casting, and the main function of the roasting is that the shell is roasted at high temperature to remove impurities such as moisture, residual wax materials, salts, organic matters in refractory materials and the like in a cavity through a physical and chemical reaction, so that the defects that the casting has air holes, slag inclusion and the like and even the chemical composition, the mechanical property and the like of the casting are influenced due to the fact that a large amount of gas escapes from the shell due to the impurities in the cavity during high-temperature pouring are avoided. The roasting function can remove impurities in the cavity and can also enable the shell to be poured at the temperature required by the process, thereby reducing the temperature difference between the liquid metal and the shell and improving the mold filling capacity. At present, shell roasting is mainly carried out in a shell roasting mode and a boxing roasting mode, in the boxing roasting process, a casting mould shell is required to be placed in a corresponding sand box, refractory sand is filled in the sand box, a layer of refractory sand is attached to the surface of the casting mould shell, and then the casting mould shell is taken out to be roasted at a high temperature to obtain the shell. In the process of filling the refractory sand, if a pouring cup is arranged above the casting mould shell, the refractory sand is easy to enter the casting mould shell from the pouring cup, thereby causing influence on the quality of a cast product formed finally.

Disclosure of Invention

In order to solve the technical problem, the invention provides a casting formwork casing roasting process.

The invention is realized by the following technical scheme.

The invention provides a casting formwork casing roasting process, which comprises the following steps:

providing a casting mould shell, a sand box and a protective cover with an opening at one end, wherein a sprue cup is arranged on the casting mould shell, the protective cover covers the sprue cup, the casting mould shell is placed in the sand box, refractory sand is filled in a gap in the sand box, the casting mould shell is taken out, the protective cover is taken down, the sprue cup is covered by refractory materials, and the casting mould shell is roasted at high temperature to obtain a mould shell.

The casting formwork boxing roasting process further comprises the following steps:

after filling refractory sand into the void inside the flask, the relative height between the refractory sand surface and the shield lip edge is made greater than zero.

The edge of the opening of the protective cover is also provided with a turned edge turned over towards the outer peripheral surface of the protective cover.

The height of the curled edge is less than one fifth of the height of the protective cover.

The protective cover is made of natural rubber.

The protective cover is in a frustum shape.

The refractory material is asbestos.

The sand box is made of iron.

The invention has the beneficial effects that: by adopting the technical scheme of the invention, the protective cover is covered at the cup opening of the pouring cup in advance before the casting mould shell is arranged in the sand box, so that refractory sand is effectively prevented from entering the casting mould shell through the pouring cup, a foundation is laid for improving the forming quality of a final casting, in addition, the protective cover is made of natural rubber, has better elasticity, can be suitable for pouring cups with various dimensions, has excellent tearing resistance and good wear resistance, and can be well attached to the surface of the pouring cup, so that the refractory sand is effectively prevented from leaking into the casting mould shell, in addition, the edge of the cover opening of the protective cover is provided with the curled edge, the protective effect of the protective cover is further improved, and the forming quality of the final casting is favorably improved.

Drawings

FIG. 1 is a schematic view of the present invention in a casting formwork encasement bake process;

fig. 2 is a schematic structural view of the shield of the present invention.

In the figure: 1-casting mould shell, 2-sand box, 3-protective cover, 4-refractory sand and 31-curled edge (31).

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

As shown in FIG. 1 and FIG. 2, the invention provides a casting formwork casing roasting process, comprising the following steps:

providing a casting mould shell 1, a sand box 2 and a protective cover 3 with an opening at one end, arranging a sprue cup on the casting mould shell 1, covering the protective cover 3 at the position of the sprue cup, placing the casting mould shell 1 in the sand box 2, filling refractory sand 4 into a gap in the sand box 2, taking out the casting mould shell 1, taking down the protective cover 3, covering the position of the sprue cup with refractory materials, and roasting the casting mould shell 1 at high temperature to obtain the mould shell. Preferably, the opening edge of the hood 3 is further provided with a bead 31 turned toward the outer peripheral surface thereof. The height of the bead 31 is less than one fifth of the height of the hood 3.

Further, the casting formwork casing roasting process also comprises the following steps:

after the refractory sand 4 is filled into the space inside the flask 2, the relative height between the surface of the refractory sand 4 with respect to the lip edge of the shield cover 3 is made greater than zero.

Preferably, the material of the protection cover 3 is natural rubber. The protective cover 3 is in a frustum shape. The refractory material is asbestos. The material of the sand box 2 is iron.

By adopting the technical scheme of the invention, the protective cover is covered at the cup opening of the pouring cup in advance before the casting mould shell is arranged in the sand box, so that refractory sand is effectively prevented from entering the casting mould shell through the pouring cup, a foundation is laid for improving the forming quality of a final casting, in addition, the protective cover is made of natural rubber, has better elasticity, can be suitable for pouring cups with various dimensions, has excellent tearing resistance and good wear resistance, and can be well attached to the surface of the pouring cup, so that the refractory sand is effectively prevented from leaking into the casting mould shell, in addition, the edge of the cover opening of the protective cover is provided with the curled edge, the protective effect of the protective cover is further improved, and the forming quality of the final casting is favorably improved.