CN113547084A

CN113547084A - Vertical pouring core assembly process method for exhaust manifold casting

Info

Publication number: CN113547084A
Application number: CN202010341144.9A
Authority: CN
Inventors: 邓超
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2021-10-26

Abstract

The invention discloses a vertical pouring core assembly process method for an exhaust manifold casting, which comprises a sand mould, a sand core, a core head, a pouring system, a vertical riser, a free-form tray and a core assembly plate of the casting; the sand mold and the sand core are connected into a whole through the core print, the pouring system and the connected sand mold and sand core are combined through the concave-convex mould block to form an integral mould core pouring system which is annularly arranged, and the integral mould core pouring system is integrally arranged on the mould following tray and is combined and fixed in a concave-convex mould block mode; the group core plates are inserted into the fixing grooves of the pallet, and the group core plates are fastened by fixing bolts: according to the invention, the traditional horizontal pouring of the exhaust manifold casting is improved into vertical pouring, and meanwhile, an annular arrangement mode is adopted, so that one set of pouring system is shared, and the process yield is greatly improved. If the 3D printing mode is adopted to manufacture the integral sand core, the parting problem of the traditional molding method can be effectively avoided, the casting blank seam is eliminated, and the surface quality of the product is improved.

Description

Vertical pouring core assembly process method for exhaust manifold casting

Technical Field

The invention belongs to the technical field of casting, and particularly relates to a vertical pouring core assembly process method for an exhaust manifold casting.

Background

The exhaust manifold casting product has complex shape and geometry, and must be subjected to parting treatment by adopting the traditional casting process, so the casting product can only adopt a horizontal casting method, the casting method causes more and dispersed volume shrinkage points in the molten steel solidification process, a large number of risers are required for feeding, and the process yield is seriously influenced; meanwhile, the riser is complicated to arrange, so that the cutting work needs to be manually carried out; and because the influence of sand mould typing, the green body seam can be produced to final product certainly, and the manual work volume of the process of polishing is very big during the aftertreatment.

Disclosure of Invention

The invention aims to provide a vertical pouring core assembly process method for an exhaust manifold casting, which combines the combined integral sand core with a pouring system in an annular arrangement mode to realize vertical pouring of the casting product and greatly improve the process yield.

In order to achieve the purpose, the invention provides the following technical scheme:

a vertical pouring core assembly process method for an exhaust manifold casting is characterized by comprising the following steps: the casting sand core comprises an integral sand mold of a casting, an integral sand core, a vertical core head, a pouring system, a vertical riser, a free-form tray and a core assembling plate; the integral sand mold and the integral sand core are connected into a whole through a vertical core print, the vertical riser is arranged at the feeding position, the pouring system and the plurality of connected integral sand mold cores are combined through concave-convex mold blocks to form an integral core pouring system which is annularly arranged, the integral sand mold core pouring system is integrally arranged on the molding tray and is combined and fixed in a concave-convex mold block mode; the core plate sets are inserted into the fixing grooves of the free-form trays, and the core plate sets are fastened through fixing bolts.

Preferably, the concave-convex block of the casting system connected with the integral sand-type sand core is trapezoidal.

Preferably, the concave-convex mould block of the mould following tray fixed integral core pouring system is trapezoidal.

Preferably, the vertical riser is an open riser.

The core assembling process method comprises the following steps:

s1: determining a pouring position and ensuring that an exhaust manifold casting product is in a vertical state;

s2: calculating the size of a dead head required by casting of an exhaust manifold casting product;

s3: determining a pouring system, realizing the connection with a plurality of integral sand mold cores, forming a pouring structure in annular arrangement, ensuring that molten steel stably rises along the cross section of a casting product, and finishing mold filling pouring;

s4: removing a pouring channel and a riser after the molten steel is solidified and formed to obtain an exhaust manifold casting product;

compared with the prior art, the invention has the following beneficial effects:

according to the invention, the exhaust manifold casting is set to be vertical pouring, the gravity effect is fully exerted, the volume shrinkage points generated in the molten steel solidification process are gathered at the top of the air inlet, the vertical riser is adopted for one-time feeding, meanwhile, the molten steel enters the casting cavity from the side by using the cross gate, the effect of the lateral riser is replaced, the feeding above the highest exhaust port is completed, the using amount of the riser is greatly reduced, and the process yield is improved.

If the sand mold and the sand core are manufactured and molded at one time by adopting 3D printing and are connected into a whole by adopting the vertical core print, the outer wall of a casting product and the surface of an inner cavity can be smooth and flawless, and a final product has no blank seam after pouring, thereby realizing the remarkable improvement of the surface quality of the product and the great reduction of the polishing workload.

The combined integral sand mold sand core and the pouring system are combined to form annular or array arrangement, and the arrangement positions of the risers are consistent, so that the cutting and separating work of the pouring system and the casting after shakeout can be carried out by using automatic equipment without manual operation.

The combined integral core pouring system adopts a consistent vertical arrangement mode and is annularly arranged, the distances between the integral sand cores and the pouring gate are the same, and the quality consistency of the cast product is high, so that the final use performance of the product is effectively improved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-4, the invention comprises a sand mold, a sand core, a vertical core print, a pouring system, a vertical riser, a free-form tray and a core assembling plate of a casting; the sand mold and the sand core are connected into a whole through a vertical core print, the vertical riser is arranged at the feeding position, the pouring system and the plurality of connected sand mold sand cores are combined through concave-convex mold blocks to form an integral core pouring system which is annularly arranged, the integral core pouring system is integrally arranged on the free-form tray and is combined and fixed in a concave-convex mold block mode; the core plate sets are inserted into the fixing grooves of the free-form trays, and the core plate sets are fastened through fixing bolts.

In the present invention, it is preferable that the concave-convex block of the integrated sand core connected to the gating system is trapezoidal.

In the present invention, it is preferable that the concave-convex block of the pallet-follow fixed integral core gating system is trapezoidal.

Specifically, taking a top pouring type pouring system as an example, molten steel enters a pouring system (4) and reaches the bottom, then slowly rises, and enters a casting mold through a cross gate after reaching a lowest cross gate, the liquid level of the molten steel in a casting mold cavity gradually rises along with the increase of the amount of the molten steel, and after the pouring and filling are completed, the molten steel is solidified into a casting, the volume is contracted and is influenced by the action of gravity, and the main contraction positions are the top ends of an air inlet and an air outlet.

The method for the vertical pouring core assembly process of the exhaust manifold casting provided by the embodiment of the invention is described in detail, the principle and the embodiment of the invention are explained by applying specific examples, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and application ranges, such as changing the number of the whole sand cores arranged annularly, changing the shape of the concave-convex block, changing the manufacturing manner of the sand cores, or applying the idea of the present invention to similar products such as the volute integrated exhaust manifold, and as mentioned above, the content of the present specification should not be construed as limiting the present invention.

Drawings

FIG. 1 is a schematic cross-sectional view of a top-pouring gating system according to the present invention;

FIG. 2 is a side sectional schematic view of FIG. 1;

FIG. 3 is a schematic cross-sectional view of a bottom pouring gating system according to the present invention;

FIG. 4 is a side sectional schematic view of FIG. 3;

in the figure, (1) -sand mold, (2) -sand core, (3) -vertical core print, (4) -casting system, (5) -vertical riser, (6) -random tray, and (7) -group core plate.

Claims

1. A vertical pouring core assembly process method for an exhaust manifold casting is characterized by comprising the following steps: the casting sand mold comprises a sand mold (1) of a casting, a sand core (2), a vertical core head (3), a pouring system (4), a vertical riser (5), a free-form tray (6) and a core assembling plate (7); the sand mold (1) and the sand core (2) are connected into a whole through a vertical core head (3), the pouring system (4) and the connected sand mold and sand core are combined through a concave-convex mold block, the vertical riser (5) is arranged at a feeding position to form an integral core pouring system which is annularly arranged, and the integral core pouring system is integrally arranged on the molding tray (6) and is combined and fixed in a concave-convex mold block mode; the core assembling plates (7) are inserted into the fixing grooves of the free type tray, and the core assembling plates are fastened through fixing bolts.

2. The vertical pouring core assembly process method for the exhaust manifold casting according to claim 1, characterized in that: the sand mold (1) and the sand core (2) are not limited by a manufacturing mode, and can be manufactured by adopting a core shooter and then assembled to form an integral casting core; the printing and manufacturing can also be integrally carried out by adopting a 3D printing mode, and then the vertical core heads (3) are connected into a whole.

3. The vertical pouring core assembly process method for the exhaust manifold casting according to claim 1, characterized in that: the side surface of the sand mold (1) is provided with a convex shape, and the convex shape range is larger than the cross gate part.

4. The vertical pouring core assembly process method for the exhaust manifold casting according to claim 1, characterized in that: the pouring system (4) can be manufactured in a 3D printing mode, and can also be manufactured by a core shooter; the side surface of the pouring system is provided with a concave type which is respectively connected with the convex type of the sand mould (1) to form an integral core pouring structure which is annularly arranged; the bottom of the pouring system is provided with a convex type which is used for being combined and fixed with the free-type tray.

5. The vertical pouring core assembly process method for the exhaust manifold casting according to claim 1, characterized in that: the combined integral core gating system is not limited by a gating mode, and can adopt a top pouring type gating system or a bottom pouring type gating system.

6. The vertical pouring core assembly process method for the exhaust manifold casting according to claim 1, characterized in that: the bottom of the free-type tray (6) is provided with a concave type matched with the convex type of the bottom of the pouring system and a fixed groove with the same thickness as the core plate (7); if a bottom pouring type pouring mode is adopted, pouring channel holes are also arranged at the bottom of the free-form tray and used for assembling pouring channels.

7. The vertical pouring core assembly process method for the exhaust manifold casting according to claim 1, characterized in that: the group core plates (7) are inserted into and fixed in the grooves of the molding pallet (6), the height of the fixed group core plates is consistent with that of the sand mold (1), and the group core plates (7) are fastened and connected through fixing bolts.

8. The vertical pouring core assembly process method for the exhaust manifold casting according to claim 1, characterized in that: and the pouring system (4) is connected with the plurality of combined integral sand mold sand cores to form annular or array arrangement.

9. Use of any of the core assembly process methods of claims 1-8, characterized by comprising the steps of:

s4: and (4) solidifying and forming the molten steel, and removing a pouring system and a riser to obtain an exhaust manifold casting product.