CN110014125B - Casting structure of core-spun craft sand core combination of diesel engine cylinder body - Google Patents
Casting structure of core-spun craft sand core combination of diesel engine cylinder body Download PDFInfo
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- CN110014125B CN110014125B CN201910435987.2A CN201910435987A CN110014125B CN 110014125 B CN110014125 B CN 110014125B CN 201910435987 A CN201910435987 A CN 201910435987A CN 110014125 B CN110014125 B CN 110014125B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
Abstract
The invention discloses a casting structure of a core-spun craft sand core combination of a diesel engine cylinder body, and aims to provide a casting structure of a core-spun craft sand core combination of a diesel engine cylinder body, which can improve the quality of the cylinder body. The water jacket comprises a main body core, a left end core and a right end core which are respectively connected with two sides of the main body core, a top cover core arranged at the upper end of the main body core, a tray core arranged at the lower end of the main body core, a pillow core arranged on a cylinder hole core head of the main body core, a water jacket core and a water gap core arranged on the pillow core, and an oil duct core arranged on the top cover core; an asbestos pad is arranged between the contact surfaces of the main body core and the pillow core. The invention has compact structure and reasonable fire banking, can improve the surface quality of the machine body casting and effectively eliminates the problem of sand sticking on the surface of the casting.
Description
Technical Field
The invention relates to the technical field of diesel engine cylinder body casting, in particular to a casting structure of a core-spun craft sand core combination of a diesel engine cylinder body.
Background
In the aspect of diesel engine cylinder body casting process design, a multi-cylinder small-bore dry cylinder sleeve integrated gear chamber diesel engine cylinder body casting mainly comprises the following steps: 1. the tray and the top cover core in the sand core composition are molded by molding sand, and the rest sand cores are assembled with the sand core after core making and assembly are completed; 2. the connection between the sand cores is formed by solidifying the sand cores, and the connection is only required to be close to one end of the sand core; 3. and a unilateral circular fire sealing ring is adopted for fire sealing between the sand core and the outer mold. The cast by the method has the defect of sand sticking on the surface and the condition of waste products of sand falling of the cast.
The existing pouring structure of the cylinder body casting of the multi-cylinder small-bore dry cylinder liner integrated gear chamber diesel engine mainly has the following defects:
1. the casting tray and the top cover core are formed by molding sand, the performance of the molding sand is not well controlled, casting defects such as sand sticking, sand falling and the like are easy to occur on the surface of the machine body casting, and a deeper pit cannot be formed;
2. the core sand curing and forming process needs separate lock core equipment to be realized, and the position structure requirement is high;
3. the matching requirement between the sand core and the molding sand is high, and the condition that the molding part of the sand core and the molding part of the casting size deviate easily occurs;
4. after the molding box closing, the fire banking between the sand molds is not easy to control, so that the abnormal conditions of pouring shrinkage, leakage and the like can be caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a casting structure of a core-spun craft sand core combination of a diesel engine cylinder body, which can improve the quality of the cylinder body.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a casting structure of a core-spun craft sand core combination of a diesel engine cylinder body comprises a main body core, a left end core and a right end core which are respectively connected with two sides of the main body core, a top cover core arranged at the upper end of the main body core, a tray core arranged at the lower end of the main body core, a pillow core arranged on a cylinder hole core head of the main body core, a water jacket core and a water gap core arranged on the pillow core, and an oil duct core arranged on the top cover core; an asbestos pad is arranged between the contact surfaces of the main body core and the pillow core.
Preferably, the upper and lower ends of the pillow core, the left end core and the right end core are provided with protrusions, and the lower end of the top cover core and the upper end of the tray core are arranged in grooves matched with the protrusions in a corresponding mode.
Preferably, it further comprises a plastic strapping band for strapping the cast structure.
Preferably, the body core is connected to the left and right end cores by bolts.
Preferably, the nozzle core and the pillow core are connected by microwave glue curing.
Preferably, the pillow core is connected with the left end core and the right end core through steel shooting nails.
Preferably, the oil duct core and the top cover core are connected by microwave glue curing, and a glue overflow groove for storing glue is arranged at the connecting position between the top cover core and the oil duct core.
Compared with the prior art, the invention has the following advantages:
the whole set of sand core has compact structure and reasonable fire banking, improves the surface quality of the machine body casting and eliminates the problem of sand sticking on the surface of the casting. The invention effectively solves the problems of the shape deviation of the machine body casting, the sand sticking on the surface of the cylinder body casting, the sand falling and the shrinkage and leakage in the pouring process caused by the matching deviation between the core sand and the molding sand.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is an assembled exploded view of a horizontal cast structure of a diesel engine cylinder core-spun process of the present invention;
FIG. 2 is a schematic view of a fire banking structure of the present invention;
FIG. 3 is a schematic view of a glue overflow trough of the present invention;
FIG. 4 is a schematic view of the position of the plastic strapping band of the present invention;
FIG. 5 is a schematic view of a body core structure in the present invention;
fig. 6 is a view showing the structure of the exhaust gas in the present invention, in which only a part of the structure is shown.
Fig. 7 is a view showing another exhaust structure according to the present invention, in which only a part of the structure is shown.
In the figure: the structure comprises a right end core 1, a bolt 2, a main body core 3, a top cover core 4, an oil duct core 5, a left end core 6, a water jacket core 7, a pillow core 8, an asbestos pad 9, a nozzle core 10, a tray core 11, a bulge 12, a groove 13, an adhesive overflow groove 14, a plastic packing belt 15, a cylindrical sand pin 16, a square sand pin 17, a cylinder hole core head 18, a bolt hole 19, a pouring gate 21, a second exhaust hole 22, a first exhaust hole 23, a third exhaust hole 24, a fifth exhaust hole 25, an air entraining groove 26 and a fourth exhaust hole 27.
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 inventive effort based on the embodiments of the present invention, are within the scope of the present invention. In the following description, for the purpose of clearly illustrating the structure and operation of the present invention, reference will be made to the accompanying drawings by way of directional terms, but terms such as "front", "rear", "left", "right", "up", "down", etc. should be construed as words of convenience and should not be construed as limiting terms.
The casting structure of the core assembly of the core-spun craft sand core of the diesel engine cylinder body shown in fig. 1-7 comprises a main body core, a left end core and a right end core which are respectively connected with two sides of the main body core, a top cover core arranged at the upper end of the main body core, a tray core arranged at the lower end of the main body core, a pillow core arranged on a cylinder hole core head of the main body core, a water jacket core and a water gap core arranged on the pillow core, and an oil duct core arranged on the top cover core; the body core is provided with the asbestos pad between the contact surface with the pillow core, the asbestos pad can adopt the bonding agent to fix, and the asbestos pad can prevent that the molten iron from flowing to the body core from the clearance between the psammitolite among the pouring in-process from subtracting the inslot.
In this implementation, the upper and lower both ends of pillow core, left end core and right-hand member core all are provided with the arch, the lower extreme of top cap core and the upper end of tray core set up in protruding corresponding complex recess, and arch and recess constitute fire banking up structure together. The fire banking between the sand cores is formed by integrally continuous pits and bulges, the sand core of the tray top cover is designed into a square groove, and the groove is designed on the periphery of the molding surface, is continuous and is closed. The square protrusions are correspondingly formed on all the sand cores matched with the sand cores, and the protrusions are formed by combining different sand cores, so that the positions of the square protrusions on the sand cores are required to ensure that the sand cores are combined to form a closed structure. The height of the groove and the height of the protrusion can be adjusted according to the size of the sand core, and the structure has a certain sand core guiding effect besides fire banking.
In this embodiment, it also includes a plastic strapping band for strapping the cast structure. The plastic packing belt is used for locking all sand cores required for forming the whole structure of the machine body, so that the sand cores are not separated in the casting molding process, and obviously, other fixing modes can also be adopted. The plastic packing belt can prevent the sand core position caused in the logistics process and the expansion between the sand cores caused by the hardness of molten iron in the casting pouring process after the sand cores are integrally packed, and the casting quality is improved.
In this embodiment, the main body core is connected to the left end core and the right end core by bolts. The bolt penetrates through the whole sand core, sand grooves are reserved at the end of the screw rod and the position of the nut on the left end core and the right end core, the screw rod and the nut do not exceed the shape of the original sand core after being fastened, and the alloy bolt, the standard nut and the gasket are adopted. The bolt is used for locking the sand core required by forming the internal structure of the machine body, so that the sand core is not separated in the casting process.
In this embodiment, two sand pins for positioning the sand core are arranged between the main body cores and between the left end core and the right end core of the main body core, wherein one sand pin is a cylindrical sand pin, and the other sand pin is a square sand pin. The shapes of the two sand pins can be other geometric shapes or irregular shapes, and the heights can be adjusted according to needs, so that the positioning requirements in two directions can be met. And bolt holes for bolts to pass through are arranged between the connecting surfaces.
In this embodiment, two psammitolite connection face positions are equipped with the runner that supplies the molten iron circulation between left end core, right-hand member core and main part core, and the runner comprises cylindrical runner and the ingate of distribution on the runner both sides, and this kind of runner design does benefit to the homogeneity of cylinder body foundry goods tissue, makes the steady whole die cavity of being full of molten iron.
In the implementation, the water gap core and the pillow core are connected through microwave glue curing, and the oil duct core and the top cover core are connected through microwave glue curing. In order to avoid the influence of excessive microwave glue amount and expansion, a glue overflowing groove for storing glue is arranged at the connecting position between the top cover core and the oil duct core and used for collecting redundant microwave glue. The microwave adhesive is cured, so that the sand cores can be fixed quickly and effectively, the production efficiency and the beat are improved, the sand cores are ensured to be connected in a short time, and the connection is reliable.
In this implementation, the pillow core is connected with the left end core and the right end core by steel shooting nails, the steel shooting nails are vertically arranged above the left end core and the right end core which are inserted into the pillow core, and the nail shooting depths are greater than the core heights of the pillow core.
In this embodiment, the exhaust of die cavity and psammitolite has adopted the structure as shown in fig. 6~7, and the main part core has set up first exhaust hole, and the pillow core has set up the second exhaust hole, and the oil duct core has set up the third exhaust hole, and left end core, right-hand member core have set up the fourth exhaust hole, and the top cap core has set up fifth exhaust hole and air guide groove, and through this kind of exhaust setting, the gas in die cavity and the psammitolite can quick discharge, has effectively eliminated the gas pocket waste product of foundry goods.
The functions of the components of the invention are as follows:
the tray core, the top cover core, the left end core and the right end core are used for forming the outer contour of the machine body casting; the pillow core is used for forming the top surface of the machine body casting and serving as a structural support of the small sand core; the water jacket core and the water gap core are used for forming a water cavity and an oil cavity of the machine body.
When the core is assembled, the water jacket core, the asbestos pad and the water gap core are combined on the pillow core to form a whole A, then the water jacket core, the asbestos pad and the water gap core are combined with the main body core, then the left end core and the right end core are combined with the main body core to form a whole B, the whole A forms the inner cavity shape of the cylinder body, on the other hand, the oil duct core and the top cover core are combined into a combination C, finally, the whole B, the combination C forming the outer contour of the cylinder body and the tray core are combined together, and a packing belt is sealed on the outer ring of the whole sand core by using a packing machine to lock, so that the whole core-wrapping process is completed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The utility model provides a casting structure of diesel engine cylinder body core-spun technology psammitolite combination which characterized in that: the water jacket comprises a main body core, a left end core, a right end core, a top cover core, a tray core, a pillow core, a water jacket core, a water gap core and an oil duct core, wherein the left end core and the right end core are respectively connected with two sides of the main body core; an asbestos pad is arranged between the contact surfaces of the main body core and the pillow core; the plastic packing belt is used for packing the cast structure; when the core-spun craft sand core is combined, the water jacket core, the asbestos pad and the water gap core are combined on the pillow core to form a whole A, then the water jacket core, the asbestos pad and the water gap core are combined with the main body core, and the left end core and the right end core are combined with the main body core to form a whole B to form the inner cavity shape of the cylinder body; and on the other hand, the oil duct core and the top cover core are combined into a combination C, and finally the whole B, the combination C forming the outer contour of the cylinder body and the tray core are combined together and locked by a packing machine on the whole set of sand core outer ring seal through a packing belt.
2. The casting structure of the diesel engine cylinder body core-spun craft sand core combination according to claim 1, characterized in that: the upper and lower both ends of pillow core, left end core and right-hand member core all are provided with the arch, the lower extreme of top cap core and the upper end of tray core set up in protruding corresponding complex recess.
3. The casting structure of the diesel engine cylinder body core-spun craft sand core combination according to the claim 1 or 2, characterized in that: the main body core is connected with the left end core and the right end core through bolts.
4. The casting structure of the diesel engine cylinder body core-spun craft sand core combination according to the claim 1 or 2, characterized in that: the water gap core and the pillow core are connected by microwave glue curing.
5. The casting structure of the diesel engine cylinder body core-spun craft sand core combination according to the claim 1 or 2, characterized in that: the pillow core is connected with the left end core and the right end core through steel shooting nails.
6. The casting structure of the diesel engine cylinder body core-spun craft sand core combination according to the claim 1 or 2, characterized in that: the oil duct core and the top cover core are connected through microwave glue coating and curing, and a glue overflow groove for storing glue is arranged at the connecting position between the top cover core and the oil duct core.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910435987.2A CN110014125B (en) | 2019-05-23 | 2019-05-23 | Casting structure of core-spun craft sand core combination of diesel engine cylinder body |
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| CN201910435987.2A CN110014125B (en) | 2019-05-23 | 2019-05-23 | Casting structure of core-spun craft sand core combination of diesel engine cylinder body |
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| CN110014125A CN110014125A (en) | 2019-07-16 |
| CN110014125B true CN110014125B (en) | 2020-12-29 |
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| CN112846094B (en) * | 2020-12-31 | 2022-05-24 | 苏州勤堡精密机械有限公司 | Full-shell core high-precision core assembly process for four-cylinder body of engine |
| CN112958746B (en) * | 2021-05-17 | 2021-07-23 | 宁波全力机械模具有限公司 | Core set for casting hydraulic multi-way valve, manufacturing method thereof and casting method of multi-way valve |
| CN113579165B (en) * | 2021-07-08 | 2023-06-02 | 昆明云内动力股份有限公司 | Casting structure and method for sand core combination of diesel engine cylinder cover core assembly vertical casting process |
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| CN101823126A (en) * | 2010-05-19 | 2010-09-08 | 芜湖市金贸流体科技股份有限公司 | Method for casting multi-cylinder diesel engine cylinder body |
| CN103480800B (en) * | 2013-08-30 | 2015-11-25 | 广西玉柴机器股份有限公司 | Cylinder head sand core group and assemble method |
| CN103878316A (en) * | 2014-04-02 | 2014-06-25 | 广西玉柴机器股份有限公司 | Process for effectively preventing sand inclusion defect caused by process water blocking hole of air cylinder body |
| CN204353426U (en) * | 2015-01-04 | 2015-05-27 | 重庆秦安铸造有限公司 | The sand core of water jacket structure of cylinder cover of automobile engine |
| CN207592729U (en) * | 2017-12-08 | 2018-07-10 | 广西玉柴机器股份有限公司 | A kind of one case two pieces vertical pouring cast structure of Diesel engine cylinder body casting |
| CN108660365A (en) * | 2018-04-24 | 2018-10-16 | 上柴动力海安有限公司 | A kind of production technology of 7H diesel engine cylinder covers casting |
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