WO2016049950A1

WO2016049950A1 - Feeding device and system and high pressure moulding method

Info

Publication number: WO2016049950A1
Application number: PCT/CN2014/088988
Authority: WO
Inventors: 祝建勋; 刘烨; 李恒峰; 唐峰; 李家永
Original assignee: 济南圣泉倍进陶瓷过滤器有限公司
Priority date: 2014-09-30
Filing date: 2014-10-20
Publication date: 2016-04-07
Also published as: CN105522115A; ES2779928T3; CN105522115B; EP3202508A1; EP3202508B1; EP3202508A4

Abstract

Disclosed is a feeding device, comprising a locating element (41) used to be connected to a riser, and a break-off element (42) connected to the locating element, wherein the locating element is of a disc shape with a through-hole (411) in the middle part, the middle part of the locating element is provided with a boss (412) extending upward at the through-hole; and the break-off element is of a barrel shape, the upper part of the break-off element is of a cylinder shape, the lower part is of a cone shape, and the upper part of the break-off element is interference-fitted into the boss of the locating element; and the locating element and the break-off element are of a metal material. Further disclosed are a feeding system and a high pressure moulding method. The locating element and the break-off element of the above feeding device generate relative displacement by friction to achieve the function of relieving pressure from the riser, such that the riser is well protected, and the problems in the prior art, such as sand dropping and easy inclining of a riser when a break-off piece is in frictional contact with the riser, can be avoided.

Description

Feeding device and system and high pressure modeling method

Technical field

The present invention relates to the field of casting technology, and more particularly to a feeding device and system and a high pressure molding method using the same.

Background technique

During the casting process, most molten metal liquids are reduced in volume during cooling and solidification, called shrinkage. If no measures are taken for this phenomenon, shrinkage and shrinkage defects will occur inside the solidified metal casting. In order to prevent casting defects, it is necessary to ensure that there is a replenishable molten metal during the solidification of the casting to fill the cavity formed in the interior of the casting due to the shrinkage of the liquid volume. This process is called "feeding the casting", and the reservoir that supplies the molten metal is called the riser. After the casting is sanded, the riser needs to be removed from the casting. In order to facilitate the removal of the riser, a cuttable piece can be arranged at the mouth of the riser, and the contact area of the riser and the casting can be reduced by the easy cutting piece, and at the same time A necked structure is formed between the two, and the stress is concentrated on the easy-to-cut portion when the riser is removed, so as to remove the riser.

The high-pressure molding production line began in the 1960s and is an efficient modeling method. It is a manufacturing method in which a high-pressure type plate is advanced to form a sand mold with a moist sand (also referred to as wet sand). The method has the advantages of high production efficiency and good shape quality, and the obtained casting has good surface smoothness and high precision. However, the high-pressure molding production line puts special requirements on the riser of the feeding process. When the riser in the sand type is formed, it must be able to withstand the molding pressure of the high-pressure plate extrusion wet sand. At the same time, in order to facilitate the riser cutting of the casting after casting and to reduce the influence of the hot section formed by the hot riser on the microstructure of the casting, a cuttable piece is generally arranged at the bottom of the riser and the casting.

At present, it is common for the riser to use the easy-cut piece as a round table-shaped easy-cut piece and a metal material easy-cut piece.

As shown in FIG. 1 , the truncated-shaped easy-cut piece 11 is provided with an easy-cutting opening 13 which is made of coated sand, chromite ore, ceramic material or the same material as the riser 12 . The problem with the easy-to-cut piece during use is that during the high-pressure molding process, the easy-cut piece has no pressure on the riser. The buffering effect, the riser itself still needs to withstand the molding pressure of the high-pressure plate extrusion wet sand, the riser is easy to damage, and the cost of the riser is increased; the easy-to-cut piece is easy to be broken or broken, thereby causing subsequent mold-cutting, At the same time, the sand particles generated by the easy-cutting pieces are easy to fall into the cavity, and if the cleaning is not clean, the defects of the sand holes and the air holes may occur in the casting.

A metal material easy cutting piece 21, as shown in Fig. 2, the upper part of the easy-to-cut piece is cylindrical and the lower part is conical. The upper part is positioned and guided during installation, and the lower part is mainly used to reduce the riser neck to facilitate the removal of the riser 22. In use, the upper cylindrical portion of the easy-cut piece is inserted into the mouth of the mouth, and a portion of the inner wall of the riser near the upper end is provided with a plurality of sand ribs (not shown) uniformly distributed along the circumference. The function of the sand rib is to fix the easy-to-cut piece and to realize the positioning of the easy-to-cut piece in its axial direction.

The problems with this kind of easy-to-cut piece during use are:

(1) During the high-pressure molding process, the easy-to-cut piece and the riser are relatively displaced by friction to reduce the pressure on the riser, which acts as a buffer and better protects the riser. However, in the process, The sand rib of the riser will be damaged, and the damaged sand will enter the cavity. If it is not cleaned in time, it will cause defects in the sand and pores of the casting, which will cause the casting to be scrapped.

(2) The easy-cut piece requires a higher size of the riser, and the presence of the sand ribs also complicates the shape of the riser, thereby affecting the production efficiency and yield of the riser.

(3) The inner cavity of the riser is provided with a draft angle, and the upper end of the easy-cut piece is cylindrical, and the coaxiality of the two insertions is poor. Therefore, when the high-pressure type plate is pressed into the sand type, the riser is liable to be inclined. , resulting in poor filling during casting. In addition, due to the inclination of the riser, the positioning rod inserted in the riser is also inclined or bent, resulting in poor mold release.

Another metal material cut piece 31, as shown in Fig. 3, is composed of a cylindrical pipe portion 311 and a conical pipe portion 312 which are connected up and down, and the upper end of the cylindrical pipe portion 311 is provided with a plurality of openings 313 arranged in the circumferential direction. When in use, the cylindrical tube portion is elastically deformed and gathered toward the center to form a wedge-shaped mating structure therebetween. The easy-cut piece of the structure also reduces the pressure on the riser by friction, plays a buffering role, better protects the riser, and does not need to have sand ribs on the inner wall of the riser. The problem of the easy-cut piece in use is that the easy-cut piece relieves the wear and sand loss problem of the easy-cut piece shown in Fig. 2, but since the easy-cut piece and the riser are still interference fit, it cannot This problem is completely avoided, and other problems with the easy-to-cut piece shown in Fig. 2 are not solved.

Summary of the invention

The technical problem to be solved by the present invention is to provide a feeding device and system capable of buffering and protecting the riser, and avoiding the problem that the easy cutting piece and the riser contact friction generate sand and the riser is easy to tilt. Modeling method.

In order to solve the above technical problem, the present invention provides the following technical solutions:

In one aspect, a supplemental device is provided comprising a positioning element for connection to a riser and a frangible element coupled to the positioning element, wherein:

The positioning element has a disk shape with a through hole in the middle, and a central portion of the positioning element has an upwardly extending boss at the through hole;

The easy-cutting element is cylindrical, the upper part of the easy-cutting element is cylindrical, the lower part of the easy-cutting element is tapered, and the upper interference fit of the easy-cutting element is disposed in the boss of the positioning element ;

The positioning element and the easy-cutting element are both made of metal.

Further, the through hole in the middle of the positioning element is a circular through hole, the upper part of the easy cutting element is cylindrical, and the lower part of the easy cutting element is conical.

Further, a circular arc transition connection is formed between the cylindrical upper portion of the fragile element and the conical lower portion.

Further, the shape of the lower opening of the fragile element is trapezoidal, square, elliptical, U-shaped or V-shaped.

In another aspect, a feeding system is provided comprising a riser and a feeding device as described above, the positioning member of the feeding device being bonded at the opening of the riser, the outer diameter of the boss of the positioning member Less than or equal to the inner diameter of the opening of the riser, the boss of the positioning element is located within the opening of the riser.

Further, an upper end surface of the easy-cutting component of the feeding device is flush with an upper end surface of the positioning component.

In still another aspect, a method of high pressure modeling is provided, comprising:

Step (1): placing the above-mentioned feeding system at a predetermined position of the mold;

Step (2): pouring enough molding sand into the mold to cover the feeding system with the molding sand;

Step (3): pressing the molding sand along the axial direction of the riser, so that the easy-cutting element of the feeding device gradually moves toward the inside of the riser along the boss of the positioning member, and finally The desired sand type.

Further, the upper end surface of the easy-cutting element of the feeding device in the feeding system in the step (1) is flush with the upper end surface of the positioning member.

Further, in the feeding system of the step (1), the upper portion of the riser has a positioning hole, and the mold is provided with a positioning rod, and the positioning rod passes through the easy-cutting element and the Describe the inner cavity of the riser and pass out the positioning hole;

The lower opening of the easy-cutting element of the feeding device is in a clearance fit or a transition fit with the positioning rod.

The invention has the following beneficial effects:

In use, the feeding device of the present invention is bonded to the opening of the riser so that the positioning member is flush with the lower end surface of the riser, and the boss of the positioning member is located in the inner cavity of the riser during the high-pressure molding production process. The positioning component and the easy-cutting component generate a relative displacement by friction to reduce the pressure of the riser, thereby buffering, better protecting the riser; and since the positioning component and the easy-cutting component are both metal materials, The invention can avoid the problem that the easy cutting piece and the riser contact friction and sand in the prior art. In addition, since the positioning member is flush with the lower end surface of the riser, and the boss of the positioning member has a guiding effect on the easy-cutting member, the problem that the riser is easy to tilt in the prior art is also avoided in the high-pressure molding process.

DRAWINGS

1 is a schematic view showing a state of use of a truncated-shaped easy-cut piece in the prior art;

2 is a schematic view showing a state of use of a metal material easy-cut piece in the prior art;

3 is a schematic structural view of another metal material easy-cut piece in the prior art;

Figure 4 is a schematic cross-sectional view of the feeding device of the present invention;

Figure 5 is a schematic exploded view of the feeding device of Figure 4;

Figure 6 is a schematic view 1 showing the state of the feeding system of the present invention in a high-pressure molding production process;

Fig. 7 is a second schematic view showing the state of the feeding system of the present invention in a high pressure molding production process.

detailed description

The technical problems, the technical solutions, and the advantages of the present invention will be more clearly described in the following description.

In one aspect, the present invention provides a supplemental device, as shown in Figures 4-5, comprising a positioning element 41 for connection to a riser and a frangible element 42 coupled to the positioning element 41, wherein:

The positioning member 41 has a disk shape with a through hole 411 in the middle, and a central portion of the positioning member 41 has an upwardly extending boss 412 at the through hole 411;

The easy-cutting element 42 is cylindrical, the upper part of the easy-cutting element 42 is cylindrical, the lower part of the easy-cutting element 42 is tapered, and the upper interference fit of the easy-cutting element 42 is disposed in the boss 412 of the positioning element 41;

The positioning member 41 and the easy-cutting member 42 are both made of a metal material such as carbon steel, stainless steel, ductile iron, aluminum alloy, copper alloy, or the like.

In use, the feeding device of the present invention is bonded to the opening of the riser so that the positioning member is flush with the lower end surface of the riser, and the boss of the positioning member is located in the inner cavity of the riser during the high-pressure molding production process. The positioning element 41 and the easy-cutting element 42 act to reduce the pressure of the riser by friction to generate a relative displacement, thereby providing a buffering function, better protecting the riser; and since the positioning element 41 and the easy-cutting element 42 are both metal The material, therefore, can avoid the problem that the easy cutting piece and the riser contact friction and sand in the prior art. In addition, since the positioning member 41 is flush with the lower end surface of the riser, and the boss 412 of the positioning member 41 has a guiding effect on the easy-cut member 42, the riser in the prior art is also avoided in the high-pressure molding process. Tilting problem.

In the feeding device of the present invention, the upper interference fit of the easy-cut element 42 is disposed in the boss 412 of the positioning member 41, the interference fit is such that the positioning member 41 and the frangible member 42 are firmly coupled together and ensure When the feeding device is installed to the riser and the subsequent transportation, the two will not produce relative displacement; only in the high-pressure molding production process, after the pressing force of the high-pressure plate, the two will be rubbed. Relative displacement, which acts as a buffer for the riser.

In the present invention, in order to facilitate the production process, the through hole 411 in the middle of the positioning member 41 is preferably a circular through hole. Correspondingly, the upper portion of the easy-cut element 42 is cylindrical, and the lower portion of the easy-cut element 42 It is conical. Of course, the through hole may also be other shapes such as a square shape, and does not affect the implementation of the technical solution of the present invention. Moreover, for ease of manufacture, a circular arc transition is preferably provided between the cylindrical upper portion of the frangible element 42 and the conical lower portion. Further, the shape of the lower opening of the easy-cut element 42 may be various shapes such as a trapezoidal shape, a square shape, an elliptical shape, a U shape, or a V shape.

In the present invention, the height of the boss 412 of the positioning member 41 is preferably set to be small to reduce the contact area of the feeding device with the molten metal, and to reduce the chilling effect of the feeding device on the molten metal. For the dimensions (height, thickness, etc.) of the portions of the positioning element 41 and the easy-cutting element 42, those skilled in the art can flexibly set the principle of the riser buffer protection according to the present invention in combination with actual conditions.

In another aspect, the present invention also provides a feeding system, as shown in FIGS. 6-7, comprising a riser and the above-described feeding device, wherein the positioning member 41 of the feeding device is bonded to the opening of the riser 51, positioning The outer diameter of the boss of the member 41 is less than or equal to the inner diameter of the opening of the riser 51, and the boss of the positioning member 41 is located in the opening of the riser 51 (i.e., into the inner cavity of the riser 51).

Preferably, as shown in FIG. 4, the upper end surface of the frangible element 42 of the feeding device is flush with the upper end surface of the positioning member 41 (i.e., the upper end surface of the boss 412), so that it is easy to determine the feeding device and include the filling. The initial height of the feeding system of the shrinking device makes it easy to secure a plurality of risers. The high rise shape has a uniform height of the plurality of riser necks, ensuring the effect of feeding.

In still another aspect, the present invention provides a method of high pressure modeling comprising:

Step (2): Pour enough molding sand into the mold to cover the filling system (as shown in Fig. 6);

Step (3): pressing the molding sand along the axial direction of the riser, so that the easy-cutting element 42 of the feeding device gradually moves toward the inside of the riser 51 along the boss of the positioning member 41 (final as shown in FIG. 7), and finally Get the sand type you want.

The material selection for the sand type, the remaining steps of the high pressure molding process, and the like are the same as the prior art, and will not be described herein.

In the step (1), the upper end surface of the frangible element 42 of the feeding device in the feeding system is preferably flush with the upper end surface of the positioning member 41, so that it is easy to determine the feeding device and the filling device The initial height of the feeding system makes it easy to protect multiple risers. The high rise shape has a uniform height for the multiple riser necks, ensuring the effect of the feeding.

In the step (1), in order to facilitate the installation of the riser, the upper portion of the riser 51 in the feeding system may have a positioning hole 53, and the positioning rod 52 may be disposed on the mold, and the positioning rod 52 may pass through the feeding device. Cutting element 42 and the inner cavity of the riser 51 and out of the positioning hole 53;

The lower opening of the easy-cutting element 42 of the feeding device and the positioning rod 52 can be either a clearance fit or a transition fit, which does not affect the implementation of the technical solution of the present invention.

In summary, the present invention has the following beneficial effects:

(1) In the present invention, the positioning element and the easy-cutting element are relatively displaced by friction to reduce the pressure of the riser, thereby buffering, better protecting the riser; and because both the positioning element and the easy-cutting element The invention is made of a metal material. Therefore, the present invention avoids the problem that the easy-to-cut piece and the riser are in direct contact with each other in the prior art;

(2) Since the positioning element is flush with the lower end surface of the riser, and the boss of the positioning element has a guiding effect on the easy-cutting element (while ensuring the coaxiality), the high-pressure molding production process is also avoided. There is a problem in the technology that the riser is easy to tilt;

(3) The invention has reduced requirements on the size of the riser, and the inner wall of the riser does not need to be provided with sand ribs, which simplifies the shape of the riser and improves the production efficiency and yield of the riser;

(4) The upper end surface of the frangible element of the feeding device may be flush with the upper end surface of the positioning member, thus making it easier to determine the initial height of the feeding device and the feeding system including the feeding device relative to the prior art. Therefore, it is easy to protect a plurality of risers, and the plurality of riser necks have a uniform height after the high pressure molding, thereby ensuring the effect of feeding;

(5) In the present invention, the height of the boss of the positioning member can be set small, the contact area between the feeding device and the molten metal is reduced, and the chilling action of the feeding device on the molten metal is reduced.

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims

A feeding device comprising: a positioning member for connecting to a riser and a cutting element coupled to the positioning member, wherein:

The positioning element has a disk shape with a through hole in the middle, and a central portion of the positioning element has an upwardly extending boss at the through hole;

The easy-cutting element is cylindrical, the upper part of the easy-cutting element is cylindrical, the lower part of the easy-cutting element is tapered, and the upper interference fit of the easy-cutting element is disposed in the boss of the positioning element ;

The positioning element and the easy-cutting element are both made of metal.
The feeding device according to claim 1, wherein the through hole in the middle of the positioning member is a circular through hole, the upper portion of the fragile member is cylindrical, and the lower portion of the fragile member is conical. .
The feeding device according to claim 2, wherein a cylindrical upper portion of the frangible element and a conical lower portion are arcuately connected.
The feeding device according to claim 1, wherein the shape of the lower opening of the fragile member is trapezoidal, square, elliptical, U-shaped or V-shaped.
A feeding system, comprising: a riser and a feeding device according to any one of claims 1 to 4, wherein a positioning member of the feeding device is bonded at an opening of the riser, The outer diameter of the boss of the positioning element is less than or equal to the inner diameter of the opening of the riser, and the boss of the positioning element is located in the opening of the riser.
The feeding system according to claim 5, wherein an upper end surface of the frangible member of the feeding device is flush with an upper end surface of the positioning member.
A method for high pressure modeling, comprising:

Step (1): placing the feeding system according to claim 5 at a predetermined position of the mold;

Step (2): pouring enough molding sand into the mold to cover the feeding system with the molding sand;

Step (3): pressing the molding sand along the axial direction of the riser, so that the easy-cutting element of the feeding device gradually moves toward the inside of the riser along the boss of the positioning member, and finally The desired sand type.
The method according to claim 7, wherein in the feeding system of the step (1), the upper end surface of the frangible element of the feeding device is flush with the upper end surface of the positioning member.
The method according to claim 7, wherein in the feeding system of the step (1), the upper portion of the riser has a positioning hole, and the mold is provided with a positioning rod, and the positioning rod passes through the Deducing the easy-cutting element of the feeding device and the inner cavity of the riser and penetrating the positioning hole;

The lower opening of the easy-cutting element of the feeding device is in a clearance fit or a transition fit with the positioning rod.