CN115846597A - Main combustion casting pipe complex cavity casting mold/core forming method - Google Patents
Main combustion casting pipe complex cavity casting mold/core forming method Download PDFInfo
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- CN115846597A CN115846597A CN202211544953.5A CN202211544953A CN115846597A CN 115846597 A CN115846597 A CN 115846597A CN 202211544953 A CN202211544953 A CN 202211544953A CN 115846597 A CN115846597 A CN 115846597A
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Abstract
The utility model provides a method for forming a main combustion casting pipe complex cavity casting mold/core, which belongs to the technical field of sand casting and comprises the following steps: according to the outline of the main combustion casting pipe, a parting surface is designed in the center of the bent pipe and is parallel to the plane of the thick flange; according to the shape and the size of the complex cavity of the main combustion casting pipe, three-dimensional modeling is carried out on the core through three-dimensional drawing software, the obtained three-dimensional model is partitioned, and the partitions are manufactured and assembled by adopting a three-dimensional printing technology to obtain the core; the main combustion casting pipe casting system adopts a horizontal-vertical casting process, and a bottom casting type casting system is used for stably filling the mold; the main combustion casting pipe adopts a heat-insulating riser sleeve for feeding; designing exhaust holes on the top of the sand mold according to the size and shape of the main combustion casting pipe mold core; and installing the assembled core in a cavity of the sand mold. The invention solves the problems that the main combustion casting pipe of the medium-high speed high-power diesel engine is easy to have casting defects of slag inclusion, shrinkage porosity, thick defect structure, floating graphite and the like, and realizes the casting batch production of the main combustion casting pipe.
Description
Technical Field
The invention belongs to the technical field of sand casting, and particularly relates to a method for forming a main combustion casting pipe complex cavity casting mold/core.
Background
The diesel engine is the main part of power operation, and the performance of the main combustion casting pipe which is used as a key part of the diesel engine is the premise of ensuring the normal operation of the diesel engine. Therefore, in order to ensure the normal operation of the diesel engine, the main fuel casting pipe needs to meet certain quality requirements. The main combustion casting pipe has a very complex structure, the wall thicknesses are very different, the main wall thickness is only 8mm, the inner cavity and the outer cavity of the main combustion casting pipe have sealing test requirements, high casting size precision and defect control capability are required, and the casting technical requirement is high.
For the main combustion casting pipe with the complex cavity and high dimensional precision requirement, a more reasonable casting process must be designed in the casting process. At present, the traditional furan resin sand is usually used for manual molding in casting, and a pouring system adopts a flat-casting scheme for pouring. However, the size precision of the main combustion casting pipe produced in the way is difficult to achieve, the cavity is complex and is not easy to remove sand, the cavity is easy to scour in the molten iron mold filling process to generate floating sand, impurities in the cavity cannot effectively float upwards, and the inclusion defect is easy to form on the upper plane of the casting. Because the inner and outer pipe cavity need to be subjected to pressure tests, certain requirements are placed on compactness, and serious inclusion can cause that a sealing test cannot pass, water leakage occurs, and the diesel engine installation is seriously influenced. The conventional casting process is not suitable for the production of main combustion cast pipes.
Among them, patent document CN106799461a discloses a method for forming a casting mold by three-dimensional spray printing, in which a sand mold is directly spray printed by a three-dimensional spray printing method using a material such as a water-based binder, and the casting mold is obtained by a treatment method such as sintering. The casting mold has low strength and large gas evolution, and is easy to generate a plurality of defects in the production process. Patent document CN109332578a discloses a mould-free casting forming method of frozen clay sand, which comprises mixing molding sand and binder, placing the mixture in a sand box, compacting, freezing and curing in a low-temperature environment, cutting out a required sand mould by a cutting tool after the strength of the sand mould meets the requirement, and integrally assembling to obtain a casting mould. Such molds have the disadvantages of high water content and high gas evolution, and require refrigeration equipment in the manufacturing process, which is costly.
Therefore, it is necessary to develop a method for forming a mold/core with a complicated cavity of a main combustion casting tube, so as to overcome the problems of low dimensional accuracy and easy defect generation of the conventional hand-molding core, and realize the casting batch production of the main combustion casting tube.
Disclosure of Invention
The technical problem solved by the invention is as follows: the invention provides a method for forming a casting mold/core of a main combustion casting pipe with a complex cavity, and aims to solve the problems that the main combustion casting pipe of a medium-high speed high-power diesel engine is easy to have casting defects such as slag inclusion, shrinkage porosity, thick defective structure, graphite floating and the like, and realize the casting batch production of the main combustion casting pipe.
In order to achieve the purpose, the invention adopts the technical scheme that:
a main combustion casting pipe complex cavity casting mold/core forming method is provided, wherein a core structure of a main combustion casting pipe comprises a thick flange, a bent pipe and a bent pipe center core from top to bottom, and the method comprises the following steps:
step 1): according to the outline of the main combustion casting pipe, a parting surface is designed in the center of the bent pipe, the parting surface is parallel to the plane of the large and thick flange, and the outline of the sand mold at the upper and lower positions of the parting surface is determined according to the outline size of a casting;
step 2): according to the shape and the size of a complex cavity of a main combustion casting pipe, three-dimensional modeling is carried out on a core through three-dimensional drawing software, the obtained three-dimensional model is partitioned, and each partition is manufactured and assembled through a three-dimensional printing technology to obtain the core;
and step 3): the main combustion casting pipe casting system adopts a horizontal-vertical casting process, and a bottom casting type casting system is used for stably filling the mold; the horizontal casting and vertical casting refer to that a sand mold is horizontally placed for core assembly, after the sand mold is combined into a box, the sand mold is vertically placed for casting, and a parting surface is vertical to the ground;
step 4): the main combustion casting pipe adopts a heat-preservation riser bush for feeding, and the riser bush is arranged at the top of the sand mould, namely right above the thick flange;
step 5): designing exhaust holes at the top of the sand mould according to the main combustion casting pipe and the size and shape of the core in the step 3);
step 6): and (3) installing the assembled mold core in a mold cavity of a sand mold, and combining the upper sand mold and the lower sand mold to form a casting mold.
In the step 1), the distance between the parting surface and the upper surface and the lower surface of the bent pipe is 38.4mm.
In the step 2), the mold core is partitioned into a thick flange, a bent pipe and a bent pipe center core.
In the step 2), the partitioned mold core is positioned and assembled through a positioning shaft.
In the step 3), the pouring cup of the pouring system is positioned on the top and parting surface of the sand mold.
In the step 3), when the sand mold is vertically poured, the thick flange of the main combustion casting pipe is arranged above the main combustion casting pipe, and the bent pipe is arranged below the main combustion casting pipe.
In the step 4), the radius of the inner cavity of the riser bush is 20-23 mm.
In the step 5), the diameter of the vent hole is 0.5 mm-3 mm.
And in the step 6), the mold core and the sand mold are positioned and installed through a positioning groove.
Compared with the prior art, the invention has the advantages that:
1. according to the scheme, the sand core is partitioned and manufactured by adopting a three-dimensional printing technology, so that the manufacturing time and the manufacturing cost of the sand core with the complex cavity are reduced, and the requirement on dimensional accuracy is met;
2. the scheme adopts the design of a pouring system with horizontal casting and vertical casting and low-temperature quick casting, can ensure that the liquid level rises stably and the gas and scum escape capacity is strong, avoids the phenomenon that a casting mold and a chill reach thermal saturation too early and reduce or lose the chilling effect by high-temperature molten iron, fully utilizes the graphitization expansion of the molten iron to perform feeding, avoids the casting defects of slag inclusion, shrinkage porosity, thick tissues, graphite floating and the like, faces the thick flange of a casting upwards, is convenient to set and is beneficial to feeding and slag floating;
3. according to the scheme, the heat-insulation riser sleeve of the perlite powder with small heat storage coefficient and heat insulation function is adopted at the top of the pouring position, so that the solidification time of the riser is prolonged, and the feeding efficiency of the riser is improved;
4. the main combustion casting pipe produced by applying the method has qualified water cavity tightness and size through detection, and casting defects such as slag inclusion, shrinkage porosity and the like are not found through penetrant inspection after dissection; meanwhile, the process and the method provided by the scheme can also be popularized and applied to the forming of other casting complex cavity casting molds/cores.
Drawings
FIG. 1 is a front view of the main fuel pipe of the present invention;
FIG. 2 is a perspective view of the main fuel pipe of the present invention;
FIG. 3 is a front view of the construction of the insert of the present invention;
FIG. 4 is a left side view of the construction of the core of the present invention;
FIG. 5 is a schematic view of a gating system of the present invention;
FIG. 6 is a diagram showing the positions of a pouring cup, a riser bush and an exhaust hole on the top of a sand mold in the invention;
FIG. 7 is a schematic view of a positioning groove reserved on a sand mold according to the present invention;
FIG. 8 is an assembly view of a core of the present invention;
FIG. 9 is an assembly view of a sand mold and core of the present invention;
FIG. 10 is a schematic view of the typing position of the present invention.
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Please refer to fig. 1-9, which illustrate an embodiment of the present invention.
Example 1:
a method for forming a main combustion casting pipe complex cavity casting mold/core comprises the following steps:
the main combustion casting pipe of a diesel engine of a certain model has the overall size of 401mm in length, 225mm in width and 193mm in height, is complex and compact in structure, has the main wall thickness of only 8mm, and adopts a sand casting mode according to casting materials and production yield as shown in figures 1 and 2.
This main cast tube core structure that fires is from last down including thick big flange 1, return bend 2, return bend center 3, specifically includes following step:
step 1): according to the outline of the main combustion casting pipe casting, the parting surface is designed on the central surface of the bent pipe 2. Referring to fig. 10, the parting plane is parallel to the plane of the large flange 1, the distance between the parting plane and the upper and lower surfaces of the bent pipe 2 of the main combustion casting pipe casting is 38.4mm, and the outline of the sand mold at the upper and lower positions of the parting plane is determined according to the external dimension of the casting;
step 2): according to the shape and the size of a complex cavity in the main combustion casting pipe, three-dimensional modeling is carried out on the main combustion casting pipe by adopting three-dimensional drawing software AutoCAD to obtain a three-dimensional model; according to the shape and size of the three-dimensional model, the three-dimensional model is divided into three parts, printing is carried out by adopting a three-dimensional printing technology, and after the printing is finished, a mold core is assembled, wherein the three parts are respectively a thick flange 1, a bent pipe 2 and a bent pipe central core 3, as shown in figures 3, 4 and 8. The thick flange 1 is connected with the bent pipe 2 through two circular positioning shafts, the positioning shafts are arranged on the bent pipe, the radius of the positioning shafts is 15mm, and the length of the positioning shafts is 30mm; the elbow 2 is connected with the elbow middle core 3 through a square positioning shaft, and the positioning shaft is arranged on the elbow 2, and has the side length of 15mm and the length of 30mm. The adopted molding sand material is furan resin sand.
The sand core is partitioned and manufactured by adopting the three-dimensional printing technology, so that the manufacturing time and the manufacturing cost of the sand core with the complex cavity are reduced, and the requirement on dimensional accuracy is met.
Step 3): the main combustion casting pipe adopts a casting system 4 for flat vertical casting, a thick large flange 1 of the main combustion casting pipe faces upwards, a bent pipe 2 faces downwards, the casting system 4 adopts a bottom casting type, a pouring cup 7 is designed at the top of a sand mold, and two ingates are adopted to be connected with the bent pipe, as shown in figure 5. And performing horizontal casting, namely horizontally placing the sand mold for core assembly, after mould assembling, vertically placing the sand mold for casting, wherein the parting surface is vertical to the ground. In this casting scheme, the casting system is designed on the parting plane, and the pouring cup 7 is 45.5mm away from the side of the sand mold 9, as shown in fig. 6. The radius of the straight pouring channel is 15.1mm, the length of the inner pouring channel is 35.4mm, the width is 25.3mm, and the height is 9.2mm.
This scheme adopts the casting system design of flat-making vertical casting, low temperature fast casting, can make the liquid level rise steadily, and the ease gas dross ability is strong, avoids the molten iron of high temperature to make casting mould and chill reach thermal saturation too early and reduce or lose the effect of chilling, and make full use of iron liquid graphitization inflation carries out the feeding, avoids casting defects such as inclusion sediment, shrinkage porosity, the tissue is thick, graphite floats, faces upward with the thick big flange of foundry goods, is convenient for set up and does benefit to filling and slag come-up.
Step 4): feeding is carried out by adopting a heat-preservation riser bush 5 of perlite powder, and the riser bush 5 is arranged at the top of the lower sand mould, and the distance between the riser bush 5 and the side surface of the lower sand mould is 174.2mm and 125.7mm. The inner cavity diameter of the riser bush 5 is 22.7mm as shown in fig. 6.
The invention adopts the heat-insulating riser sleeve of the perlite powder with small heat storage coefficient and heat-insulating function at the top of the pouring position, prolongs the solidification time of the riser and improves the feeding efficiency of the riser.
Step 5): according to the size and shape of the main combustion casting pipe casting and the core, four exhaust holes 6 are formed in the top of the sand mold 9, the diameter of each exhaust hole 6 is 2mm, and the distance between each exhaust hole 6 and the side face of the sand mold 9 is 60mm, as shown in fig. 6.
Step 6): the core is installed in the cavity of the sand mold 9 according to the positioning grooves on the core and sand mold 9, as shown in fig. 7-9, and the upper and lower sand molds are combined to obtain the casting mold. The length of the casting mould is 512mm, the width is 353mm, the height of an upper sand mould is 99.5mm, and the height of a lower sand mould is 152mm.
The main combustion casting pipe produced by the method has qualified water cavity tightness and size through detection, and casting defects such as slag inclusion, shrinkage porosity and the like are not found through penetrant inspection after dissection. Meanwhile, the process and the method provided by the scheme can also be popularized and applied to the forming of other casting complex cavity casting molds/cores.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.
Claims (9)
1. A main combustion casting pipe complex cavity casting mold/core forming method is characterized in that a main combustion casting pipe core structure comprises a thick flange, a bent pipe and a bent pipe middle core from top to bottom: the method comprises the following steps:
step 1): according to the outline of the main combustion casting pipe, a parting surface is designed in the center of the bent pipe and is parallel to the plane of the large flange, and the outline of the sand mold at the upper position and the lower position of the parting surface is determined according to the outline size of a casting;
step 2): according to the shape and the size of a complex cavity of a main combustion casting pipe, three-dimensional modeling is carried out on a core through three-dimensional drawing software, the obtained three-dimensional model is partitioned, and each partition is manufactured and assembled through a three-dimensional printing technology to obtain the core;
and step 3): the main combustion casting pipe casting system adopts a horizontal-vertical casting process, and a bottom casting type casting system is used for stably filling the mold; the horizontal casting and vertical casting refer to that a sand mold is horizontally placed for core assembly, after the sand mold is combined into a box, the sand mold is vertically placed for casting, and a parting surface is vertical to the ground;
step 4): the main combustion casting pipe adopts a heat-preservation riser bush for feeding, and the riser bush is arranged at the top of the sand mould, namely right above the thick flange;
step 5): designing exhaust holes at the top of the sand mould according to the main combustion casting pipe and the size and shape of the core in the step 3);
step 6): and (4) installing the assembled mold core in a mold cavity of a sand mold, and combining the upper sand mold and the lower sand mold to form a casting mold.
2. The method of claim 1, wherein in step 1), the parting plane is spaced from the upper and lower surfaces of the main fuel pipe by a distance of 38.4mm.
3. A method for forming a complex cavity mold/core for a main fuel pipe according to claim 1, wherein: in the step 2), the mold core is partitioned into a thick flange, a bent pipe and a bent pipe center core.
4. A method for forming a complex cavity mold/core for a main fuel pipe according to claim 1, wherein: in the step 2), the partitioned mold core is positioned and assembled through a positioning shaft.
5. A method for forming a complex cavity mold/core for a main fuel pipe according to claim 1, wherein in step 3), the pouring cup of the pouring system is located at the top of the sand mold and on the parting plane.
6. A method for forming a complex cavity mold/core for a main fuel pipe according to claim 1, wherein: in the step 3), when the sand mold is vertically poured, the thick flange of the main combustion casting pipe is arranged above, and the bent pipe is arranged below.
7. A method for forming a complex cavity mold/core for a main fuel pipe according to claim 1, wherein: in the step 4), the radius of the inner cavity of the riser bush is 20-23 mm.
8. The method of forming a mold/core for a complex cavity of a main fuel pipe according to claim 1, wherein: in the step 5), the diameter of the vent hole is 0.5 mm-3 mm.
9. A method for forming a complex cavity mold/core for a main fuel pipe according to claim 1, wherein: and in the step 6), the mold core and the sand mold are positioned and installed through a positioning groove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211544953.5A CN115846597A (en) | 2022-12-02 | 2022-12-02 | Main combustion casting pipe complex cavity casting mold/core forming method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211544953.5A CN115846597A (en) | 2022-12-02 | 2022-12-02 | Main combustion casting pipe complex cavity casting mold/core forming method |
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| CN115846597A true CN115846597A (en) | 2023-03-28 |
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| CN202211544953.5A Pending CN115846597A (en) | 2022-12-02 | 2022-12-02 | Main combustion casting pipe complex cavity casting mold/core forming method |
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- 2022-12-02 CN CN202211544953.5A patent/CN115846597A/en active Pending
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