CN216540734U - Bottom pouring method casting stack sand mould - Google Patents

Abstract

The utility model relates to the technical field of blank casting stack sand molds, in particular to a bottom-pouring casting stack sand mold die which comprises at least two sand molds containing a plurality of air conditioner compressor piston iron casting cavities, wherein the sand molds are sequentially stacked from bottom to top, a sprue and a riser are axially arranged in each sand mold, a cross gate is arranged at the bottom of each sand mold in the horizontal direction, the sprue is communicated with the riser through the cross gate, and the cross gate is communicated with each air conditioner compressor piston iron casting cavity. The utility model is provided with the sprue and the bottom runner, so that slag is effectively filtered, the internal defect rate of the casting is reduced, the product quality is stable, the production cost is reduced, and the production efficiency is improved.

Description

Bottom pouring method casting stack sand mould

Technical Field

The utility model relates to the technical field of blank casting stack sand molds, in particular to a bottom pouring method casting stack sand mold die.

Background

The die is important technological equipment for modern industrial production, meets the requirement of industrial mass production, and along with the rapid development of the alloy industry and the requirement of various large industrial fields including aerospace, electronic machinery, ships, automobiles and the like on plastic products, the structure of the alloy product is more complex, and the requirement on the structure of the die is higher and higher.

At present, the domestic box-stacked sand mold is suitable for blank casting processes of piston rings of internal combustion engines and pistons of air-conditioning compressors, wherein the majority of casting molds applied to piston ring casting is green sand box-stacked molds, sand molds are manufactured by a molding machine, after the sand molds are manually inspected to be qualified, the sand molds are stacked to a specified number of boxes to form a stacked casting mold, and blanks required by people are obtained after pouring and solidification. However, in the traditional sand mold stack production process, only one molten iron sprue is provided, slag and other impurities are easy to enter a cavity in the pouring process, so that a large amount of sand holes, slag holes and slag holes in a casting are increased, the defects of impurities exist, the percent of pass of the casting is reduced, the production cost is increased, and the production efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to solve the defect problems in the prior art, the utility model provides the lower pouring method casting stack sand mould, which has the advantages of stable product quality, reduction of the internal defect rate of castings, reduction of production cost and improvement of production efficiency.

The technical scheme adopted by the utility model for solving the technical problem is as follows: the utility model provides a lower method casting stack sand mould, includes the sand mould case that contains a plurality of air condition compressor piston iron casting die cavities, the sand mould case is equipped with at least two and stacks from the bottom up in proper order, and the sand mould case is interior to be equipped with sprue and rising head axially, and the sand mould case bottom horizontal direction is provided with the cross gate, and sprue and rising head communicate through the cross gate, and each air condition compressor piston iron casting die cavity is run-through to the cross gate.

Through the technical scheme, molten iron enters the air conditioner compressor piston iron casting cavity from the sprue to the cross gate at the bottom of the sand mold stack cavity, the whole pouring process is smooth and stable, slag is contained, and sufficient floating time is provided, so that the internal defect rate of the casting is reduced, and the qualification rate is improved.

Furthermore, the air conditioner compressor piston iron casting die cavities are distributed in the sand box in a circumferential array mode, and sand cores are arranged in the air conditioner compressor piston iron casting die cavities.

Through the technical scheme, the air conditioner compressor piston iron casting die cavities are arranged, so that the production efficiency is effectively improved, and meanwhile, the sand cores can enable the air conditioner compressor piston iron castings to be rapidly shaped.

Furthermore, the ends, far away from the end connected with the cross gate, of the sprue and the risers are provided with expanding parts with outward openings, the sprue of the combined and laminated sand mold box is communicated with each other to form a molten iron pouring channel, the risers are communicated with each other to form an exhaust channel, and the molten iron pouring channel is communicated with the exhaust channel through the cross gate.

Through the technical scheme, molten iron is poured through the molten iron pouring gate, then flows to the lowest cross gate, and is filled upwards continuously after being filled with the molten iron through the bottom layer, and bubbles generated in pouring are discharged along with the riser to the exhaust hole.

Furthermore, an ingate is arranged at the joint of the cross gate and the air conditioner compressor piston iron casting cavity, a second downward inclined wall is arranged at the top of the inner wall of the ingate, and the second downward inclined wall inclines towards the air conditioner compressor piston iron casting cavity along the ingate.

Through the technical scheme, the inclined plane is arranged on the inner pouring gate, so that impurities such as scum and the like can be effectively intercepted and enter the air conditioner compressor piston iron casting cavity, and the purity of the iron casting is improved.

Furthermore, a first downward inclined wall is arranged between the riser and the inner pouring gate at the top of the cavity of the cross pouring gate, and the first downward inclined wall is inclined along the direction from the riser to the inner pouring gate.

Through the technical scheme, the inclined intercepting cavities are formed in the positions, located on the two sides of the riser, of the inner wall of the cross pouring channel, so that space can be provided for floating slag to rise, and meanwhile, the discharging of bubbles is facilitated.

Furthermore, the cross gate is provided with a first necking channel at two sides of the riser, and a second necking channel is arranged at the connecting part of the cross gate and the ingate.

Through the technical scheme, the necking channel is arranged to intercept the slag floating on the inclined wall, so that the purity of the fluid is improved.

Furthermore, the single cross pouring gate is communicated with a plurality of branched ingates, and the ingates are correspondingly connected with a plurality of air conditioner compressor piston iron casting cavities.

Through the technical scheme, the inner pouring channel is connected with the multiple air conditioner compressor piston iron casting cavities, so that the production speed is effectively improved, and the production efficiency is accelerated.

Compared with the prior art in the background art, the utility model has the beneficial effects that:

according to the utility model, the sand mold box is provided with the straight pouring and the bottom transverse pouring, the straight pouring is beneficial to directly flowing to the bottom in the molten iron pouring process, then, scum and bubbles are filtered through the bottom transverse pouring, and then, the scum and bubbles are further filtered through the ingate, so that the purity is improved, the molten iron at the bottom layer is poured into the iron casting cavity and then is filled up in a first-level and first-level manner, and a large amount of impurities are prevented from being remained.

Drawings

FIG. 1 is a schematic structural diagram of a stack sand mold cast by the down-pouring method according to the embodiment;

FIG. 2 is a partial sectional view of a bottom-pour casting stack sand mold B-B of the present embodiment;

FIG. 3 is a C-C partial sectional view of a lower pouring method casting stack sand mold according to the present embodiment;

FIG. 4 is a schematic cross-sectional view of the inner runner of the lower-pouring stack sand mold according to the present embodiment.

In the figure: 1. sand molding boxes; 2. a sprue; 21. an expanding portion; 3. a riser; 4. a cross gate; 41. a first downwardly inclined wall; 42. a first throat; 43. a second throat; 5. an inner pouring channel; 51 a second downwardly sloping wall; 6. a sand core; 7. air condition compressor piston iron casting die cavity.

Detailed Description

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following description taken in conjunction with the accompanying drawings.

It is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like as used herein, are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and therefore should not be considered limiting of the present invention. "plurality" means two or more unless otherwise specified.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

As shown in fig. 1 to 4, the bottom pouring casting stack sand mold provided by the utility model comprises a sand mold box 1 containing a plurality of air conditioner compressor piston iron casting cavities, wherein at least two sand mold boxes 1 are sequentially stacked from bottom to top, a sprue and a riser 3 are axially arranged in each sand mold box 1, a cross gate 4 is arranged at the bottom of each sand mold box 1 in the horizontal direction, the sprue 2 is communicated with the riser 3 through the cross gate 4, and the cross gate 4 is connected with the air conditioner compressor piston iron casting cavities.

Preferably, a sprue 2 and a bottom sprue 4 are arranged on the mold, the sprue 2 and a riser 3 of the sand mold 1 which are overlapped in sequence are communicated to form a molten iron pouring channel and an exhaust channel respectively, during pouring, the molten iron pouring temperature is relatively increased, then molten iron enters along the sprue 2 on the sand mold 1 and reaches the sprue 4 connected with the bottom through the mutually communicated molten iron pouring channel, a first reducing channel 42 is arranged at the joint of the sprue 4, the riser 3 and the sprue 2, the diameter of the first reducing channel 42 is smaller than that of the sprue 4 and is used for intercepting residues and impurities of molten iron which is just injected into the molten iron pouring channel, a first downward inclined wall 41 for intercepting slag or other impurities and the like is further arranged on the inner wall of the sprue 4, the first downward inclined wall 41 is in a structure that one side close to the riser is higher than one side close to the second reducing channel 43 and forms an inclined cavity with a certain included angle, the molten iron flowing through the cross gate can float impurities such as slag and the like on the downward inclined wall, and the first downward inclined wall 41 can intercept the impurity slag and is beneficial to discharging bubbles in the molten iron into the first downward inclined wall 41 and then discharging the bubbles from the exhaust hole in the sand box 1 along the riser 3.

In this embodiment, the sprue 2 and the riser 3 are provided with an outwardly open enlarged diameter portion 21 at the end remote from the runner 4, which is advantageous in that: on the one hand, the discharge is accelerated in the process of facilitating the outward discharge of bubbles, and on the other hand, the contact area can be increased at the joint of the sand mould box 1 on each layer, so that molten iron can enter the runner more quickly.

Preferably, an ingate 5 is arranged at the joint of the horizontal runner 4 and the air-conditioning compressor piston iron casting cavity 7, a second downward inclined wall 51 is arranged at the top of the inner wall of the ingate 5, the second downward inclined wall 51 inclines towards the air-conditioning compressor piston iron casting cavity 7 along the ingate 5, most of large scum of molten iron is filtered when the molten iron flows through the horizontal runner 4, the scum is further intercepted on the inner wall of the top by the second downward inclined wall 51 when the molten iron flows through the ingate 5, meanwhile, a second reducing channel 43 is arranged at the joint of the horizontal runner 4 and the ingate 5, and the second reducing channel 43 and the first reducing channel 42 have the same function and further filter impurities in the molten iron, so that the purity of the molten iron entering the air-conditioning compressor piston iron casting cavity is improved.

Preferably, a single cross gate 4 is communicated with a plurality of forked ingates 5, the ingates 5 are correspondingly connected with a plurality of air conditioner compressor piston iron casting cavities 7, the air conditioner compressor piston iron casting cavities 7 are circumferentially distributed in the sand box 1 in an array manner, sand cores 6 are arranged in the air conditioner compressor piston iron casting cavities 7, the single cross gate 4 is connected with the plurality of forked ingates 5, and the design has the advantages that: on one hand, the pouring process is stable, the slag inclusion has sufficient floating time, the slag inclusion is reduced from flowing into the air conditioner compressor piston iron casting cavity 7, and on the other hand, the production speed and the production efficiency can be improved. The sand core 6 is positioned in the center of the air conditioner compressor piston iron casting cavity 7, so that no molten iron enters the sand core 6 during the casting process of the air conditioner compressor piston, and the air conditioner compressor piston after production is ensured to contain a cavity wound conductive winding.

The working principle of the embodiment is as follows: when pouring is started, each sand mould box 1 is overlapped in sequence, then pouring is carried out from a sprue 2 at the top, molten iron flows into a horizontal pouring channel 4 at the bottom along a molten iron pouring channel, scum in the molten iron is intercepted by a necking channel and a downward inclined wall body which are arranged on the horizontal pouring channel 4 and an inner pouring channel 5, generated bubbles are discharged from an exhaust channel along an overflow hole, and the filtered molten iron flows into a piston iron casting cavity 7 of an air conditioner compressor from the inner pouring channel 5, so that the pouring process is completed.

The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and any insubstantial changes and modifications made by those skilled in the art based on the present invention are within the scope of the present invention.

Claims (7)

1. The utility model provides a lower method casting stack sand mould, includes sand type case (1) that contains a plurality of air condition compressor piston iron casting die cavities, its characterized in that: the sand mould box (1) is provided with at least two sand mould boxes which are sequentially stacked from bottom to top, a sprue (2) and a riser (3) are axially arranged in the sand mould box (1), a cross gate (4) is arranged in the horizontal direction of the bottom of the sand mould box (1), the sprue (2) is communicated with the riser (3) through the cross gate (4), and the cross gate (4) is communicated with piston iron casting cavities (7) of air-conditioning compressors.

2. The bottom pour casting stack sand mold of claim 1, wherein: the air conditioner compressor piston iron casting die cavities (7) are circumferentially distributed in the sand mould box (1) in an array mode, and sand cores (6) are arranged in the air conditioner compressor piston iron casting die cavities (7).

3. The bottom pour casting stack sand mold of claim 1, wherein: one ends, far away from the end connected with the cross pouring gate (4), of the sprue (2) and the risers (3) are provided with expanding portions (21) with outward openings, the sprue (2) of the combined sand mould box (1) are communicated with each other to form a molten iron pouring channel, the risers (3) are communicated with each other to form an exhaust channel, and the molten iron pouring channel is communicated with the exhaust channel through the cross pouring gate (4).

4. A bottom pour casting stack sand mold according to claim 3, wherein: an ingate (5) is arranged at the joint of the horizontal pouring gate (4) and the air-conditioning compressor piston iron casting cavity (7), a second downward inclined wall (52) is arranged at the top of the inner wall of the ingate (5), and the second downward inclined wall (52) inclines towards the air-conditioning compressor piston iron casting cavity (7) along the ingate (5).

5. The bottom pour casting stack sand mold of claim 4, wherein: and a first downward inclined wall (41) is arranged between the riser (3) and the ingate (5) at the top of the cavity of the cross pouring gate (4), and the first downward inclined wall (41) inclines along the direction from the riser (3) to the ingate (5).

6. The bottom pour casting stack sand mold of claim 5, wherein: the cross gate (4) is positioned at two sides of the riser (3) and is provided with a first necking channel (42), and a connecting part of the cross gate (4) and the inner gate (5) is provided with a second necking channel (43).

7. The bottom pour casting stack sand mold of claim 6, wherein: the single transverse pouring gate (4) is communicated with a plurality of branched inner pouring gates (5), and the inner pouring gates (5) are correspondingly connected with a plurality of air conditioner compressor piston iron casting cavities (7).

Images