CN217252596U - Shell mould casting device of tectorial membrane sand gate valve body - Google Patents
Shell mould casting device of tectorial membrane sand gate valve body Download PDFInfo
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- CN217252596U CN217252596U CN202220012667.3U CN202220012667U CN217252596U CN 217252596 U CN217252596 U CN 217252596U CN 202220012667 U CN202220012667 U CN 202220012667U CN 217252596 U CN217252596 U CN 217252596U
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Abstract
The shell mold casting device for the valve body of the precoated sand gate valve comprises a shell mold, wherein the shell mold comprises a shape shell mold, a core shell mold and a pouring gate shell mold of precoated sand, and the pouring gate shell mold comprises a pouring cup, a straight pouring gate, a cross pouring gate and an inner pouring gate which are sequentially communicated; the integral body of the outer shell mold is divided into a front shell mold and a rear shell mold which are symmetrical, risers on the outer shell mold are respectively arranged on the upper circumferential surface of the casting drift diameter flange, and the vertical section of the inner diameter of the connecting position of the risers and the casting drift diameter flange is flush with the side surface of the casting drift diameter flange; a strip-shaped deslagging rib communicated with the riser is arranged between the riser and the circumferential surface of the casting drift diameter flange; the inner pouring channel is connected to the circumferential surface of the casting drift diameter flange; the shell mold is fixed in the box body through the compacted steel shot, and the box body is filled with the steel shot; the casting is made of carbon steel or stainless steel. The utility model discloses can improve the quality and the output of foundry goods, later stage processing is convenient, with low costs, and economic benefits is high.
Description
Technical Field
The utility model relates to a shell mould casting device, especially a shell mould casting device of tectorial membrane sand gate valve body belong to casting technical field.
Background
The gate valve is one of important accessories in pipeline transportation and is widely applied to the fields of tap water, petroleum, natural gas, chemical industry and the like. The valve body structure of the gate valve is a special structure, and particularly, the structure of an inner cavity of the gate valve is complex relative to a common casting, the casting difficulty is high, and the quality is not guaranteed well.
The traditional gate valve body mostly adopts cast iron or nodular cast iron, the mechanical property of the cast steel is higher than that of the cast iron, but the casting property of the cast steel is poorer than that of the cast iron, so the gate valve body made of the cast steel has higher requirements on a casting device.
The method for producing the casting by using the precoated sand is to use the precoated sand to make a casting mould and/or a sand core, and then to cast. However, the conventional device for producing the cast steel gate valve body by adopting precoated sand casting often faces a plurality of problems:
1) the sand shell wall is thicker, the cost is increased, and the gas generation is large;
2) the product percent of pass is only 60%, and the phenomena of shrinkage cavity, cracks and the like exist inside the product;
3) the utilization rate of the molten steel is as low as 50-55%, and the chilling block is usually added, needs to be prefabricated together with a shell mold, is easy to damage under the action of transportation or external force, and has poor structural stability;
4) the iron-sand ratio is as high as about 1: 0.8;
5) riser compensation is made to two flange planes of latus rectum, improves later stage cutting cost.
Disclosure of Invention
In order to overcome the above-mentioned not enough of prior art, the utility model provides a shell mould casting device of tectorial membrane sand gate valve body can improve the quality and the output of foundry goods, and later stage processing is convenient, with low costs, and economic benefits is high.
The utility model provides a technical scheme that its technical problem adopted is: the sand-coated sand casting mold comprises a box body and a shell mold fixed in the box body, wherein the shell mold comprises a sand-coated exterior shell mold, a core shell mold and a pouring gate shell mold, and the pouring gate shell mold comprises a pouring cup, a sprue, a cross gate and an ingate which are sequentially communicated; the integral body of the outer shell mold is divided into a front shell mold and a rear shell mold which are symmetrical, risers on the outer shell mold are respectively arranged on the upper circumferential surface of the casting drift diameter flange, and the vertical section of the inner diameter of the connecting position of the risers and the casting drift diameter flange is flush with the side surface of the casting drift diameter flange; a strip-shaped deslagging rib communicated with the riser is arranged between the riser and the circumferential surface of the casting drift diameter flange; the inner pouring channel is connected to the circumferential surface of the casting drift diameter flange; the shell mold is fixed in the box body through the compacted steel shot, and the box body is filled with the steel shot; the casting is made of carbon steel or stainless steel.
Compared with the prior art, the utility model discloses a shell mold casting device of a precoated sand gate valve body,
1. because the connecting positions of the dead head, the ingate and the slag discharging rib are all arranged on the circumferential surface of the casting drift diameter flange, and meanwhile, the inner diameter of the connecting position of the dead head and the casting drift diameter flange is designed to be flush with the side surface of the casting drift diameter flange by the vertical section positioned at the outer side, the casting machining allowance is intensively formed on the circumferential surface of the casting drift diameter flange, the generation of the casting machining allowance on the side surface is avoided, the post-treatment such as clamping, centralized cutting, polishing and the like is facilitated, and the cutting workload and the cost are reduced.
2. The steel shots filled in the box are used for replacing a heat conducting medium which is locally chilled, chilling and heat dissipation effects are good, so that defects such as shrinkage porosity, shrinkage cavities and cracks cannot be caused in a casting, gaps among the steel shots and the steel shots can accelerate shell mold heat dissipation, the thickness of a sand shell is reduced, the shell mold with small thickness can resist stress caused by condensation shrinkage under the assistance of the steel shots, outward collapse cannot be easily caused, and hidden cracks and shrinkage cavities can be avoided. The shell mould with small thickness not only saves precoated sand materials, but also saves chill, and has lower cost; when the whole casting is solidified and contracted, the internal resistance can be eliminated, the final hardness of the shell mold is reduced, and the shell mold can fall off automatically in the later period. The existence of the steel shots also ensures that the condensation sequence is consistent from outside to inside, the molten steel is more uniformly condensed, and the casting quality is higher; meanwhile, the steel shot is used for filling the compacted shell mold, so that the strength of the shell mold can be enhanced, and the fire can not run out.
3. Based on the fact that the outer shell type is changed into a front-back symmetrical split body from a traditional upper-lower split body, the casting mold has the advantages that separation caused by the influence of the weight of molten steel can be avoided after the molten steel is cast, and improvement of the outer surface quality and size accuracy of castings is facilitated.
4. And because the slag discharging ribs are arranged between the riser and the casting drift diameter flange, scum in the molten steel is easy to flow into the positions of the slag discharging ribs under the action of temperature difference, thereby ensuring the casting quality.
5. To sum up, the utility model discloses can guarantee the quality of cast steel casting, can improve the product percent of pass to 95% with the experience card, the molten steel utilization ratio improves 7% -9%, can also reduce the iron-sand ratio to 1:0.35-0.45, and economic benefits is showing.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is an exploded view of the shell structure according to an embodiment of the present invention.
Fig. 3 is a front view of fig. 2.
In the figure, 10, a shell mold, 101, a half outer shell mold, 1011, a movable riser, 1012, a fixed riser, 1013, an upper supporting plate, 1014, a lower supporting plate, 1015, a bulge, 102, a half core shell mold, 103, a half pouring channel shell mold, 20, a steel shot, 30 and a box body.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 to 3 are schematic structural views illustrating a shell mold casting device of a precoated sand gate valve body according to a preferred embodiment of the present invention, which includes a box body 30 and a shell mold 10 fixed in the box body 30, wherein the shell mold 10 includes a precoated sand outer shell mold 101, a core shell mold and a runner shell mold 103, and the runner shell mold 103 includes a sprue cup, a sprue, a cross runner and an ingate which are sequentially connected; the integral outer shell type is integrally divided into a front shell type and a rear shell type which are symmetrical, namely two half outer shell types 101 are symmetrically arranged front and back, risers on the outer shell type are respectively arranged on the upper circumferential surface of the casting drift diameter flange, and the vertical section of the inner diameter of the connecting position of the risers and the casting drift diameter flange is flush with the side surface of the casting drift diameter flange; strip-shaped deslagging ribs communicated with the risers are arranged between the risers and the circumferential surface of the casting drift diameter flange; the inner pouring gate is connected to the circumferential surface of the casting drift diameter flange; the shell mold 10 is fixed in the box body 30 through the compacted steel shot 20, the box body 30 is filled with the steel shot 20, wherein the steel shot 20 is spherical, and the use effect is better when the diameter range of the steel shot 20 is 1.5-3 mm; preferably, the side of the fixed riser of the shell mold 10 after being fixed is located at the upper port of the box body 30, so that the filling degree is more favorable for rapid cooling in all directions, and the maximum uniform condensation is realized by matching with the shrinkage rate of molten steel; the casting is made of carbon steel or stainless steel.
The number of the outer shell molds and the number of the core shell molds of the embodiment are two, and the outer shell molds and the core shell molds are respectively composed of four half outer shell molds 101 and four half core shell molds 102, two half outer shell molds 101 and two half core shell molds 102 positioned on the same side form a casting shell mold, two casting shell molds positioned on two sides are connected together through two half pouring shell molds 103, and here, the two half pouring shell molds 103 correspondingly form a complete pouring shell mold. In other embodiments, the outer shell mold and the core shell mold are used in a set, and the number of the outer shell mold and the core shell mold can be one or more. Both the core shell mold and the runner shell mold may be provided in a front-rear split structure, and the adverse effect of the weight and impact force of molten steel may be eliminated.
In this embodiment, the feeder is a combined feeder, and is composed of a fixed feeder 1012 and a movable feeder 1011, the fixed feeder 1012 is directly formed on the outer shell 101, and the annular movable feeder 1011 is installed in the port of the fixed feeder 1012. The movable riser 1011 has a certain heat preservation effect on the molten steel in the fixed riser 1012, the molten steel is kept in a liquid state, the premature condensation of the molten steel is avoided, the feeding effect is ensured, the residual molten steel is less, the energy consumption is reduced, and the cost is greatly reduced.
In a specific implementation, the circumferential surface of the casting drift diameter flange can be further provided with a support plate, one part of the support plate is an upper support plate 1013 connected to a riser along the circumferential surface, the other part of the support plate is a lower support plate 1014 covering the lower semi-circumferential surface, and the ingate is connected between the upper support plate 1013 and the lower support plate 1014 on one side. The support plates help define the position of the shell mold in the shot 20 and provide a larger active area for the shot 20 to ensure that the efficacy of the shot 20 is fully developed. Preferably, the upper support plate 1013 and the lower support plate 1014 are respectively provided with a protrusion 1015 vertically higher than the outer shell surface, and the protrusion 1015 is used to form a positioning point of the whole shell 10, which is also convenient for fixing.
In a preferred embodiment of the present invention, the cross-sectional width dimension of the runner is smaller than the cross-sectional height dimension, and a bulge is provided in the overall length direction, and the specific shape may be an arc shape as shown in the figure. The design of the arc-shaped bulge part improves the flowing speed of the molten steel, and simultaneously, as the steel slag of the cast molten steel has suspension property, the steel slag can be gathered when flowing through the arc-shaped bulge part, and the effects of stopping slag and discharging slag are achieved.
As a specific implementation scheme, the outer shell type 101, the core shell type 102 and the runner shell type 103 can be fixed into a whole by binding after being assembled, and then the whole is placed in the box body 30, so that the operation is simple and rapid.
The utility model discloses shell mould casting device has accomplished the quality promotion from each side, finally can make the product percent of pass improve to 95%, and the molten steel utilization ratio improves 7% -9%, can drop iron-sand ratio to 1:0.35-0.45, and economic benefits is showing.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do the restriction in any form, all basis the utility model discloses a technical essence makes any simple modification and equal change to above embodiment, all falls into within the protection scope of the utility model.
Claims (9)
1. The shell mold casting device for the valve body of the precoated sand gate valve comprises a box body (30) and a shell mold (10) fixed in the box body (30), wherein the shell mold (10) comprises a precoated sand exterior shell mold, a core shell mold and a pouring gate shell mold, and the pouring gate shell mold comprises a pouring cup, a straight pouring gate, a cross pouring gate and an inner pouring gate which are sequentially communicated; the method is characterized in that:
the integral body of the outer shell mold is divided into a front shell mold and a rear shell mold which are symmetrical, risers on the outer shell mold are respectively arranged on the upper circumferential surface of the casting drift diameter flange, and the vertical section of the inner diameter of the connecting position of the risers and the casting drift diameter flange is flush with the side surface of the casting drift diameter flange; a strip-shaped deslagging rib communicated with the riser is arranged between the riser and the circumferential surface of the casting drift diameter flange; the inner pouring channel is connected to the circumferential surface of the casting drift diameter flange;
the shell mold (10) is fixed in the box body (30) through the compacted steel shots (20), and the box body (30) is filled with the steel shots (20); the casting is made of carbon steel or stainless steel.
2. The device of claim 1 for casting the shell of a coated sand gate valve body, wherein: the riser is a combined riser and comprises a fixed riser (1012) and a movable riser (1011), wherein the fixed riser (1012) is directly formed on the outer shape shell type, and the annular movable riser (1011) is arranged in a port of the fixed riser (1012).
3. The device of claim 2, wherein the sand coated gate valve body is cast from a shell mold comprising: the side part of the fixed riser (1012) of the shell mold (10) is fixed and then positioned at the upper port of the box body (30).
4. The device of claim 1 for casting the shell of a coated sand gate valve body, wherein: the circumferential surface of the casting through-diameter flange is also provided with a support plate, one part of the support plate is an upper support plate (1013) connected to the riser along the circumferential surface, the other part of the support plate is a lower support plate (1014) covering the lower semi-circumferential surface, and the ingate is connected between the upper support plate (1013) and the lower support plate (1014) at one side.
5. The apparatus of claim 4, wherein the sand coated gate valve body is cast in a shell mold configuration comprising: the upper support plate (1013) and the lower support plate (1014) are respectively provided with a projection (1015) which is higher than the outer shell type surface in the vertical direction.
6. The apparatus of any one of claims 1 to 5 for shell molding a valve body of a coated sand gate valve, wherein: the cross section width dimension of the cross gate is smaller than the cross section height dimension, and a bulge part is arranged in the length direction.
7. The apparatus of any one of claims 1 to 5 for shell molding a valve body of a coated sand gate valve, wherein: and the outer shell mold, the core shell mold and the pouring gate shell mold are fixed into a whole in a binding mode after being assembled.
8. The apparatus of any one of claims 1 to 5 for shell molding a valve body of a coated sand gate valve, wherein: the steel shots are spherical, and the diameter range of the steel shots is 1.5-3 mm.
9. The apparatus of any one of claims 1 to 5 for shell molding a valve body of a coated sand gate valve, wherein: the number of the outer shell molds and the number of the core shell molds are two, the outer shell molds and the core shell molds are respectively composed of four half outer shell molds (101) and four half core shell molds (102), the two half outer shell molds (101) and the two half core shell molds (102) form a casting shell mold, and the two casting shell molds are connected together through two half pouring gate shell molds (103).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220012667.3U CN217252596U (en) | 2022-01-05 | 2022-01-05 | Shell mould casting device of tectorial membrane sand gate valve body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220012667.3U CN217252596U (en) | 2022-01-05 | 2022-01-05 | Shell mould casting device of tectorial membrane sand gate valve body |
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| Publication Number | Publication Date |
|---|---|
| CN217252596U true CN217252596U (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220012667.3U Active CN217252596U (en) | 2022-01-05 | 2022-01-05 | Shell mould casting device of tectorial membrane sand gate valve body |
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| CN (1) | CN217252596U (en) |
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- 2022-01-05 CN CN202220012667.3U patent/CN217252596U/en active Active
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