CN217192488U - Casting mould - Google Patents

Abstract

The utility model relates to the technical field of casting, in particular to a casting mold with special inner chill; a casting mold; comprises a main sand core and special inner chill; the special internal chill is provided with a vent hole which can be connected with a compressed air pipeline; the special inner chill is arranged on the main body sand core; and the special internal chill is provided with a chill auxiliary core, and the chill auxiliary core is provided with an auxiliary channel communicated with the vent hole. The problems of looseness and shrinkage cavities of the thick and large part of the casting body can be effectively prevented, no casting defects of the thick and large part of the casting body are realized, casting scrapping caused by the casting leakage quality problem is solved, and the production efficiency is improved.

Description

Casting mould

Technical Field

The invention relates to the technical field of casting, in particular to a casting mold with special internal chill.

Background

The compression cylinder casting is mainly applied to a natural gas booster compressor device. The hollow inner wall body is used for bearing larger impact load of natural gas, oil and water, the most important structure is that the hollow inner wall body formed after the compression cylinder is processed has no quality problem, and the service life and the energy-saving efficiency of the natural gas booster compressor are directly influenced by loose casting defects or shrinkage cavities. At present, most of compression cylinder castings produced domestically and internationally are cast by using gray iron or low-grade ductile iron. The compression cylinder is cast by high-grade ductile iron, the thickness of the middle body of the cylinder is large, looseness and shrinkage cavities are easy to generate, the requirements of customers cannot be met by a conventional casting method, and the leakage of castings is caused by the defect of looseness or shrinkage cavities in the casting process of the series of compression cylinders, so that the rejection rate is up to more than 60%.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes among the prior art single use height, big rising head and large-scale shaping chill method that combines together can't thoroughly solve loose or shrinkage cavity casting defect, provides a casting mould, can effectively prevent the problem of loose and shrinkage cavity at the thick big position of foundry goods body, realizes that the thick big position of body does not have casting defect, has solved because of the foundry goods that foundry goods seepage quality problems arouses scrap, improves production efficiency.

The utility model provides a casting mould, which is characterized by comprising a main sand core and special inner chill; the special internal chill is provided with a vent hole which can be connected with a compressed air pipeline; the special inner chill is arranged on the main body sand core; the special inner chill is provided with a chill auxiliary core, the chill auxiliary core is provided with an auxiliary channel, and the auxiliary channel is communicated with the vent hole.

In one embodiment, the special purpose internal chill comprises a chill body; one end of the chilling block main body is provided with a fixed end, and the other end of the chilling block main body is provided with a positioning end; and anti-rotation lacing wires are arranged on two sides of the chilling block main body.

In one embodiment, the chiller body is designed to be a cylinder, the outer wall of the chiller body is provided with threads, and the size of the chiller body is 50mm-250mm in diameter and 100mm-300mm in height.

In one embodiment, the chiller auxiliary core is a square or round core pressing head.

In one embodiment, the vent hole is machined in the axial middle of the special inner chill, and a threaded nozzle is further machined at one end of the vent hole.

In one embodiment, the auxiliary channel is provided with a compressed air pipe inserted therein and connected with the threaded nozzle.

In one embodiment, when the compressed air pipeline is ventilated, the wind pressure is kept between 5MPa and 6 MPa.

Through the utility model provides a pair of casting method utilizes on a series of compression cylinder's of a certain company foundry goods, has successfully solved and has formed the loose or shrinkage cavity quality problems of cavity inner wall body after the compression cylinder processing, and through the batch foundry goods of the compression cylinder who uses this method production, foundry goods UT detects and does not discover loose or shrinkage cavity quality problems, does not discover the quality problems of seepage in processing and the use. The method of the invention is successfully applied to other castings of the same type and products of different materials. The invention effectively solves the casting defect of loose or shrinkage cavity of the casting, improves the quality of the casting and effectively solves the problem of casting leakage.

Drawings

FIG. 1 is a schematic view of a special-purpose chill used in the examples;

FIG. 2 is a schematic illustration of the use of the special purpose chill in a sand core in an embodiment;

FIG. 3 is a schematic illustration of the placement of a casting in a mold according to an embodiment;

fig. 4 is a schematic diagram of the mold assembling in the embodiment.

100-special inner chill; 110-a chill body; 120-fixed end; 130-a positioning end; 140-anti-rotation lacing wire, 150-vent hole; 200-a body core; 210-a first body core; 300-chill auxiliary cores; 400-compressed air pipe

Detailed Description

In order to more clearly illustrate the technical solution of the present invention, the present invention is further described in detail with reference to the following specific examples. Note that the following described embodiments are illustrative only for explaining the present invention, and are not to be construed as limiting the present invention.

The embodiment of the invention provides a casting mold, which is mainly used for casting production of compression cylinder castings, in particular,

a casting mould comprises a specialinternal chill 100 and a mainbody sand core 200, wherein the special internal chill is arranged at a thick part on the mainbody sand core 200, the specialinternal chill 100 is provided with avent hole 150, and thevent hole 150 can be connected with acompressed air pipeline 400; the specialinternal chill 100 is provided with a chillauxiliary core 300, and the chillauxiliary core 300 is provided with an auxiliary channel which is communicated with thevent hole 150.

Specifically, the specialinner chill 100 is designed by mainly analyzing a 2D drawing, calculating the size of the key thick and large part of a compression cylinder product, carrying out naked simulation defect analysis through a 3D digital model, designing the specialinner chill 100 aiming at the thick and large structural part in the middle of a compression cylinder casting, carrying out solidification and mold filling simulation again until the defect is eliminated, and correcting the size of the special inner chill according to the simulation result.

Referring to fig. 1, the specialinner chill 100 is specifically illustrated, the specialinner chill 100 is designed as a cylinder, and the outer wall of the specialinner chill 100 is provided with threads, so that the threads are designed to increase the fusion speed with liquid molten iron in the pouring process of the special inner chill, and prevent the leakage risk caused by a liquid film gap between the special inner chill and the body. The specialinternal chill 100 comprises a chillmain body 110 and a cylindrical structure, wherein the size of the chillmain body 110 is controlled to be 50mm-250mm in diameter and 100mm-300mm in height, if the chill main body is designed to be too large, the final feeding effect cannot be achieved, and the specific size is designed and corrected according to the simulation mode in the steps.

Further, the specialinternal chill 100 further comprises a fixedend 120 and apositioning end 130, so that the special internal chill is used for positioning and fixing in the sand core, specifically, the fixedend 120 and thepositioning end 130 are core heads, wherein the fixedend 120 is a core pressing head with the length of 30mm-50mm, and thepositioning end 130 is a core lowering positioning head with the length of 100mm-150 mm. In this embodiment, thefixing end 120 and thepositioning end 130 are provided at the middle of the core head along the axial direction of theinner chill body 110, the length of thefixing end 120 is 30mm, and the length of thepositioning end 130 is 100 mm.

Furthermore, in order to achieve better fixing and fusing effects, the specialinner chill 100 is further designed withanti-rotation tie bars 140, specifically, theanti-rotation tie bars 140 are arranged on two sides of the outer wall of the chillmain body 110 and symmetrically arranged, theanti-rotation tie bars 140 can prevent the specialinner chill 100 from rotating in the casting mold and facilitate the fixing and fusing of the casting body under high-temperature pouring, and the problem of casting leakage can be further solved.

In order to achieve the technical effect of the invention, the specialinternal chill 100 provided by the invention is further provided with avent hole 150, thevent hole 150 in the embodiment is designed to penetrate through thevent hole 150 with the diameter of 10mm, which is formed in the fixedend 120, the chillmain body 110 and thepositioning end 130, and thevent hole 150 can be a through hole with the diameter of 10mm-12mm, which is processed in the middle of the special internal chill and is used for introducing later-stage compressed air. Therefore, a threaded pipe opening is processed at one end of thevent hole 150 and is used for communicating a compressed air pipeline, the vent hole specifically functions as forming a hollow channel, and the special internal chill hollow channel is internally provided with high-pressure air, namely the flow of compressed air, in the pouring process, so that the rapid cooling of the special internal chill is accelerated, the chilling effect is 3-4 times greater than that of the conventional chill, the solidification time of a casting from a liquid state to a solid state is shortened, the casting shell is rapidly molded, the shrinkage is smoothly completed according to the feeding channel, and meanwhile, the effect of discharging the gas inside the sand core is achieved.

The chillauxiliary core 300 used in cooperation with the special internal chill is arranged above the specialinternal chill 100. Specifically, the chillerauxiliary core 300 is a core pressing head, which may be a square or circular core pressing head, and the chillerauxiliary core 300 is used for fixing the specialinner chill 100. Meanwhile, an auxiliary passage is formed in the chillerauxiliary core 300, which can be described with reference to fig. 3. First, the chillerauxiliary core 300 is disposed on thespecial chiller 100 to fix the special chiller and prevent the special chiller from rotating and moving, the auxiliary channel disposed on the chillerauxiliary core 300 is capable of communicating with thevent hole 150, and thecompressed air pipe 400 is inserted into the auxiliary channel, as can be seen from fig. 2, thecompressed air pipe 400 is inserted into the auxiliary channel disposed on the chillerauxiliary core 300, so as to communicate the externalcompressed air pipe 400 with thevent hole 150. In this embodiment, a circular core pressing head is provided as the chillauxiliary core 300.

Furthermore, in the core assembly process, the special internal chill and the main sand core are combined into a whole to form a complete casting mold. Specifically, thecore body 200 in this embodiment includes afirst body core 210 and a second body core, that is, the core body is vertically split, the core body is divided into two parts, that is, a first body core and a second body core, and a special internal chill may be provided in any one of the two parts. And assembling the box after core assembly, combining the first main body sand core and the second main body sand core which are provided with the special internal chill, and finally forming the independent casting mold with the special internal chill combined with the main body sand core.

Further, the core assembling and the box assembling process can be repeated, in the core assembling process, the combination process of the main sand core and the special inner chill is repeated, 4 independent casting molds are combined to form a complete core package, and 4 complete independent core packages are placed in the tool sand box for casting. As can be seen from fig. 4, a plurality of special internal chill may be provided in correspondence to a plurality of main core assemblies. In the mould assembling process, 12 sand core main bodies can be assembled into a whole independent core package at most in one tool sand box for pouring.

In the casting mold provided in this embodiment, during the casting step and before casting, as shown in fig. 3, acompressed air pipeline 400 is inserted into the auxiliary channel of theauxiliary core 300 of the chill, and since thespecial chill 100 is provided with the hollow throughhole 150, the connecting pipe orifice thereof is connected to the connecting pipe of thecompressed air pipeline 400, and the connecting port is hollow and communicated with thespecial chill 100. Before pouring, the high-pressure air valve is opened, and the circulating high-pressure air in the specialinternal chill 100 is continuously smooth. In the pouring process, the specialinner chill 100 is accelerated to be rapidly cooled due to high-pressure air flowing in the channel, the chilling effect is 3-4 times larger than that of the conventional chill, the solidification time of the casting from the liquid state to the solid state is shortened, the casting shell is rapidly molded, the shrinkage is smoothly completed according to the feeding channel, and the gas in the sand core is discharged. The air pressure of compressed air is kept at 5-6 MPa in the pouring process, ventilation is stopped 2 hours after pouring, the shrinkage of the hollow inner wall of the casting is finished, and the defects of shrinkage cavity and looseness are overcome. The cylinder type casting produced by the casting mould provided by the invention has the advantages that the problems of shrinkage cavity and shrinkage porosity are avoided, the special internal chill is well fused with the casting body, and the casting body is prevented from leaking.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (6)

1. A casting mould is characterized by comprising a main sand core and special internal chill;

the special internal chill comprises a chill main body; one end of the chilling block main body is provided with a fixed end, and the other end of the chilling block main body is provided with a positioning end;

the cold iron main body is designed to be a cylinder, threads are arranged on the outer wall of the cold iron main body, and the size of the cold iron main body is 50-250 mm in diameter and 100-300 mm in height;

the special internal chill is provided with a vent hole which can be connected with a compressed air pipeline;

the special inner chill is arranged on the main body sand core;

and the special internal chill is provided with a chill auxiliary core, and the chill auxiliary core is provided with an auxiliary channel communicated with the vent hole.

2. The mold as claimed in claim 1, wherein the chill body is provided with anti-rotation lacing on both sides.

3. A mould as claimed in claim 1 wherein the chill auxiliary core is a square or round die head.

4. The mold as claimed in claim 1, wherein the vent hole is formed in the axial middle of the special-purpose chill, and a threaded nozzle is formed at one end of the vent hole.

5. A mould as claimed in claim 4, wherein the auxiliary passage is adapted to receive the compressed air conduit and connect the compressed air conduit to the threaded nozzle.

6. The mold according to claim 1, wherein the compressed air duct is ventilated to maintain a wind pressure of 5MPa to 6 MPa.

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