CN112958746A

CN112958746A - Core set for casting hydraulic multi-way valve, manufacturing method thereof and casting method of multi-way valve

Info

Publication number: CN112958746A
Application number: CN202110531710.7A
Authority: CN
Inventors: 陈行全; 孙平; 黄伦达; 胡丹凤
Original assignee: NINGBO QUANLI MACHINERY MOLD CO Ltd
Current assignee: NINGBO QUANLI MACHINERY MOLD CO Ltd
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2021-06-15
Anticipated expiration: 2041-05-17
Also published as: CN112958746B

Abstract

The application discloses core group for casting hydraulic multi-way valve, manufacturing method thereof and casting method of multi-way valve, comprising: the upper core group comprises a top cover core, a first frame core and a plurality of first auxiliary sand cores, wherein a first main sand core is formed on the first frame core, each first auxiliary sand core is respectively installed on the top cover core, the first frame core is assembled on the top cover core, and each first auxiliary sand core is connected with the first main sand core; the lower core group comprises a bottom plate core, a second frame core and a plurality of second auxiliary sand cores, wherein a second main sand core is formed on the second frame core, the second frame core is assembled on the bottom plate core, the second auxiliary sand cores are respectively installed on the second frame core, and the second auxiliary sand cores are connected with the second main sand core; the packing belt packs the upper core group and the lower core group into a whole. Complicated core sand preparation can be accomplished to this application, and can effectively avoid the psammitolite and not hard up drop, improves the stability of mould to improve the finished product quality of product, simplify the production processes of mould simultaneously, the dismouting of the mould of being convenient for improves production efficiency.

Description

Core set for casting hydraulic multi-way valve, manufacturing method thereof and casting method of multi-way valve

Technical Field

The application relates to the technical field of hydraulic part casting, in particular to a core group for hydraulic multi-way valve casting, a manufacturing method thereof and a casting method of a multi-way valve.

Background

The hydraulic valve body is one of key parts in a hydraulic transmission system of engineering machinery, the hydraulic valve body has high bearing pressure, large section thickness and great weight difference, a hydraulic valve body casting does not have casting defects such as shrinkage cavity, shrinkage porosity and the like, and the size and the roughness of a runner part do not exceed the standard, so that the establishment of a simple and strict production process flow is the key for meeting the quality, and the casting production flow and the pouring process are determined according to the characteristics of the valve body.

At present, the mode that adopts the integral type to pour comes to cast the hydrovalve, but the inside shape of multiple unit valve is multichannel plunger form, and its psammitolite is out of shape easily when the preparation, is difficult to the integrated into shape, and the failure rate is high, and at the in-process of casting mould, because the inside wall of mould is vertical face, make the psammitolite slide easily and take place between the inner wall of sand box, make the die cavity take place to become flexible and drop, and then make the hydrovalve size specification of casting out not conform to the production demand, reduce the product percent of pass.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a core group for casting a hydraulic multi-way valve, which can complete the manufacture of complex core sand, effectively avoid the loosening and falling of the core sand and improve the stability of a mould, thereby improving the quality of a finished product of a product, simplifying the production process of the mould, facilitating the disassembly and assembly of the mould and improving the production efficiency.

Another object of the present invention is to provide a method for manufacturing a core set for hydraulic multi-way valve casting, which can quickly and efficiently assemble the sand core assemblies into a whole, has a stable structure, is suitable for automatic mass production, and improves production efficiency.

Another object of the present invention is to provide a method for casting a hydraulic multi-way valve, which pours a core pack for casting a hydraulic multi-way valve in a sand box in an efficient liquid injection manner, has the functions of preventing shrinkage, exhausting and collecting slag, can effectively avoid the occurrence of defects such as shrinkage during pouring, and can improve the quality of finished products.

To achieve the above object, the present application provides a core pack for hydraulic multi-way valve casting, comprising:

the upper core group comprises a top cover core, a first frame core and a plurality of first auxiliary sand cores, wherein a first main sand core is formed on the first frame core, each first auxiliary sand core is respectively installed on the top cover core, the first frame core is assembled on the top cover core so as to enable the first main sand core to be connected with the top cover core, and each first auxiliary sand core is connected with the first main sand core;

the lower core group comprises a bottom plate core, a second frame core and a plurality of second auxiliary sand cores, wherein a second main sand core is formed on the second frame core, the second frame core is assembled on the bottom plate core so as to enable the second main sand core to be connected with the bottom plate core, the second auxiliary sand cores are respectively installed on the second frame core so as to enable the second auxiliary sand cores to be respectively connected with the bottom plate core, and the second auxiliary sand cores are connected with the second main sand core;

and the packing belt is used for packing the upper core group and the lower core group into a whole so as to assemble the upper core group and the lower core group into a cavity.

Compared with the prior art, the beneficial effect of this application lies in: because the road valve casting has a complex internal shape and is difficult to manufacture sand cores, the application avoids the conventional operation of integrally manufacturing and placing the conventional sand cores into the sand box, and the mold is divided into two parts of a main upper core group and a lower core group, wherein the upper core group comprises a top cover core, a first frame core and a first auxiliary sand core, the lower core group comprises a bottom plate core and a second frame core and a second auxiliary sand core which are manufactured separately, so that the manufacturing difficulty is reduced, the production cost is reduced, the situation that the sand cores are easy to deform and break during integrated manufacturing can be avoided, the first main sand core is detachably connected with the first frame core, the second main sand core is detachably connected with the second frame core, the connection mode of the sand core structure of the main body and the frame structure is ensured, a solid frame is set for the next sand core assembly, and the first auxiliary sand core and the second auxiliary sand core which are inconvenient to be integrally manufactured are assembled in a detachable connection mode, it can not only improve the success rate of psammitolite preparation, moreover because it can dismantle, can be convenient for deposit and carry the transport when reducing the volume, lower core group and last core group accessible baling press packing fixed shaping, whole automatic completion of accessible, not only convenient and fast, and simplified production processes, improved production efficiency.

As an improvement, a plurality of first vent holes are formed in the top cover core, the first main sand core comprises a plurality of first connecting columns, the first auxiliary sand core comprises a plurality of second connecting columns, and the first connecting columns and the second connecting columns are suitable for being inserted into the first vent holes in a one-to-one correspondence manner; the bottom plate core is provided with a plurality of second vent holes, the second main sand core comprises a plurality of third connecting columns, the second auxiliary sand core comprises a plurality of fourth connecting columns, and the third connecting columns and the fourth connecting columns are suitable for being inserted into the second vent holes in a one-to-one correspondence mode.

Through the improvement, the cavity exhaust channel is composed of a plurality of exhaust grooves, the core exhaust channel is composed of a plurality of first vent holes and second vent holes, and the pouring channel is formed by communicating a plurality of pouring inlets, so that smooth exhaust can be ensured when the cavity exhaust channel, the core exhaust channel and the pouring channel are poured, and the quality of finished products is improved.

As an improvement, a plurality of cavity exhaust grooves are formed in the top cover core, and each cavity exhaust groove is communicated with the cavity to form a cavity exhaust channel; outlets of the first vent holes and the second vent holes are communicated to form a core exhaust channel; the improved structure is characterized in that a plurality of pouring inlets are formed in the bottom plate core, the pouring inlets are communicated to form a pouring channel, through the improvement, the cavity exhaust channel is formed by a plurality of exhaust grooves, the core exhaust channel is formed by a plurality of first air vents and second air vents, and the pouring channel is formed by a plurality of pouring inlets in a communicated manner, so that the cavity exhaust channel, the core exhaust channel and the pouring channel can ensure that the cavity exhaust channel, the core exhaust channel and the pouring channel are afraid of smooth exhaust when pouring, and the quality of finished products is improved.

According to the improvement, the casting sand in the sand box is formed into the fire-sealing wall along the fire-sealing grooves, so that the core exhaust channel and the cavity exhaust channel can be separated, and the riser and the core exhaust channel can be separated, so that the exhaust channels can be prevented from communicating with each other, the smoothness of the exhaust channels at the moment of pouring can be guaranteed, and the yield of products can be improved.

As the improvement, go up the core group with all seted up the confession on the core group down the fixed spacing groove of packing area, the quantity of spacing groove is two, and two the spacing groove symmetry sets up, through the improvement, sets up the mounted position that spacing groove can prepositioning packing area on last core group and the lower core group, realizes the accurate packing of packing area, and two packing areas can realize improving holistic stability to the monolithic stationary of bulk mould.

As an improvement, the first auxiliary sand core comprises a first supporting part and a first connecting part, the first connecting part is suitable for being connected with the first main sand core, a plurality of first positioning grooves are formed in the first frame core, and the first supporting part is suitable for being assembled in the first positioning grooves; the second auxiliary sand core comprises a second supporting part, a second connecting part and a third connecting part, the second connecting part is suitable for being connected with the second main sand core, the third connecting part is suitable for being connected with the first main sand core, a plurality of second positioning grooves are formed in the second frame core, the second supporting part is suitable for being assembled in the second positioning grooves, through the improvement, the first auxiliary sand core can be erected on the first main sand core through the first connecting part, the second auxiliary sand core can be erected on the second main sand core through the second connecting part, the first auxiliary sand core and the second auxiliary sand core are respectively fixed on the first main sand core and the second main sand core through the first connecting part and the second connecting part, the limiting effect is achieved, the first auxiliary sand core and the second auxiliary sand core can be effectively prevented from shaking, and the first positioning groove and the second positioning groove provide the supporting and limiting effects for the first auxiliary sand core and the second auxiliary sand core, the shaking of the first auxiliary sand core and the second auxiliary sand core is further prevented, and the integral stability of the sand core structure is improved.

In order to achieve the above object, the present application provides a method of manufacturing a core pack for hydraulic multi-way valve casting, including:

manufacturing an upper core group: respectively manufacturing a top cover core, a first frame core and a plurality of first auxiliary sand cores, wherein a first main sand core is formed on the first frame core, the first auxiliary sand cores are respectively installed on the top cover core, the first frame core is assembled on the top cover core, the first main sand core is connected with the top cover core, and the first auxiliary sand cores are connected with the first main sand core;

manufacturing a lower core group: respectively manufacturing a bottom plate core, a second frame core and a plurality of second auxiliary sand cores, wherein a second main sand core is formed on the second frame core, assembling the second frame core on the bottom plate core, connecting the second main sand core with the bottom plate core, respectively installing each second auxiliary sand core on the second frame core, respectively connecting each second auxiliary sand core with the bottom plate core, and connecting each second auxiliary sand core with the second main sand core;

packaging: and providing a packaging machine, assembling the upper core group and the lower core group, and packaging the upper core group and the lower core group into a whole through a packaging belt by the packaging machine.

Compared with the prior art, the beneficial effect of this application lies in: go up core group and core group separately preparation in proper order down, and go up core group and core group subassembly can make alone in the core group down, and make into core group and core group down through the equipment, it is deposited alone and the transportation is convenient, and can reduce the cost of transportation, because the part is little, the processing degree of difficulty is low, is suitable for the volume production, and the baling press can be with core group and core group fast assembly down, realizes automatic assembly line engineering, further improvement production efficiency.

As an improvement, the packaging step further comprises the following steps before:

coating: immersing the upper core group and the lower core group into the coating and then taking out and hanging;

drying: and drying the upper core group and the lower core group obtained in the step of coating by using drying equipment.

Through the improvement, the upper core group and the lower core group are separately soaked in the coating, so that the coating covering at each dead angle of the upper core group and the lower core group can be ensured, the coating is more comprehensive and efficient in the step of executing the step, the upper core group and the lower core group are separately dried for the time required by the clamping block drying, and the production efficiency is improved.

To achieve the above object, the present application provides a casting method of a multi-way valve, comprising:

preparing a core group packed into a whole according to a manufacturing method of the core group for hydraulic multi-way valve casting;

moving the core group to a sand box filled with casting sand, wherein a liquid inlet channel, a liquid outlet channel and a cap are formed in the sand box, a pouring outlet is formed in the top cover core, the cap is suitable for being covered on the pouring outlet in an inverted mode, pouring materials flow into the cap through the pouring outlet to form a riser, the liquid inlet channel is communicated with the pouring inlet, and the liquid outlet channel is communicated with the pouring outlet;

and the casting machine performs casting through the liquid injection channel of the sand box to obtain the hydraulic multi-way valve.

Compared with the prior art, the beneficial effect of this application lies in: the upper core group and the lower core group which are packaged are temporarily stored, and when production is needed, the lower molding and the pouring are carried out in batches, so that the packaging step, the lower molding step and the pouring step can be carried out in batches, the upper core group and the lower core group which are packaged can be uniformly subjected to the lower molding and the pouring, the process can be sequentially finished through automation, the streamlined operation of the whole process is realized, convenience and rapidness are realized, the production process is simplified, and the working efficiency of the production is improved; the liquid inlet channel and the liquid outlet channel in the sand box can limit a pouring path of pouring liquid and the pouring liquid enters from a pouring inlet; the casting material forms a cavity for storing liquid metal through the cap, namely the riser, so that the casting material has the effects of preventing shrinkage cavity, shrinkage porosity, exhaust and slag collection, and can effectively avoid the defects of shrinkage cavity and the like during casting.

As an improvement, a ceramic core bone is placed at a plunger position corresponding to the upper core group and the lower core group, and the prepared hydraulic multi-way valve is in a multi-way plunger shape; the pouring obtains hydraulic pressure multiple unit valve has a plurality of sand outlet passageways, the sand outlet passageway all sets up first frame core with on the second frame core, go up the core group with form the die joint down between the core group, the die joint is located on the sand outlet passageway, through the aforesaid improvement, go up the plunger department of the psammitolite of core group and lower core group and place ceramic core bone and be favorable to preventing that the psammitolite from warping, the mechanized operation of also being convenient for, sand outlet passageway sets up and can improve holistic stability on first frame core and second frame core, and the die joint is located sand outlet passageway simultaneously, and the foundry goods fash that produces when being convenient for clear up the group core.

Drawings

FIG. 1 is a flow chart of a hydraulic multi-way valve casting process according to the present application.

FIG. 2 is a schematic cross-sectional view of the overall structure of the present application within a sand box.

Fig. 3 is a partially enlarged view of a in fig. 2.

Fig. 4 is a perspective view of the overall structure of the sand core of the present application.

Fig. 5 is an exploded view of the overall structure of the present application.

Fig. 6 is a partial structural view of a riser formed in the core of the cap according to the present application after casting.

Fig. 7 is a perspective view of fig. 2 from a bottom view.

Fig. 8 is a perspective view illustrating an exploded structure of an upper core pack according to the present application.

Fig. 9 is a perspective view of the assembled upper core assembly of fig. 8 in the direction of the arrow.

Fig. 10 is a perspective view of an exploded structure of the lower core pack of the present application.

Fig. 11 is a perspective view of the assembled lower core assembly of fig. 10 in the direction of the arrow.

Fig. 12 is an exploded view of the lower core assembly from another perspective of the present application.

Fig. 13 is a perspective view of the top cover core of the present application in a bottom view.

Fig. 14 is a perspective view of the floor core of the present application in a bottom view.

FIG. 15 is a perspective view of the present application after casting material has passed through the post-mold core along the core vent passage, cavity vent passage and the casting passage.

Fig. 16 is a perspective view of fig. 12 from a bottom perspective.

Fig. 17 is a top view of fig. 12.

Fig. 18 is a schematic sectional view of the entire structure of the mold of the present application taken along the parting plane.

Fig. 19 is a schematic view of the casting structure of the present application.

In the figure: 1. an upper core group; 11. a cap core; 111. a first vent hole; 112. a cavity vent slot; 113. a fire sealing groove; 1131. sealing a fire wall; 114. a riser; 115. a cap; 116. a pouring outlet; 12. a first frame core; 121. a first primary sand core; 1211. a first connecting column; 122. a first positioning groove; 131. a first set of sand cores; 1311. a second connecting column; 1312. a first connection portion; 1313. a first support section; 2. a lower core group; 21. a floor core; 211. a second vent hole; 212. a pouring inlet; 22. a second frame core; 221. a second primary sand core; 2211. a third connecting column; 222. a second positioning groove; 231. a second set of sand cores; 2311. a fourth connecting column; 2312. a second connecting portion; 2313. a second support portion; 2314. a third connecting portion; 3. a limiting groove; 31. packing a belt; 41. a cavity exhaust channel; 42. a core vent passage; 43. pouring a channel; 44. a liquid inlet channel; 45. a liquid outlet channel; 51. parting surfaces; 6. casting; 7. a sand outlet; 8. a ceramic core; 9. a sand box; 91. and (4) casting sand.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the orientation words, such as the terms "central", "upper", "lower", "front", "back", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present application.

It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The application provides a hydraulic pressure is core assembly for multiple unit valve casting, as shown in fig. 4, 5, including last core assembly 1, it includes top cap core 11, first frame core 12 and a plurality of first pair of psammitolite 131, the shaping has first main psammitolite 121 on the first frame core 12, each first pair psammitolite 131 is installed respectively on top cap core 11, first frame core 12 is assembled on top cap core 11 to make first main psammitolite 121 be connected with top cap core 11, each first pair psammitolite 131 is connected with first main psammitolite 121.

And a lower core group 2 including a floor core 21, a second frame core 22 and a plurality of second sub-cores 231, wherein the second frame core 22 is formed with a second main core 221, the second frame core 22 is assembled to the floor core 21 such that the second main core 221 is connected to the floor core 21, and the second sub-cores 231 are respectively mounted to the second frame core 22 such that the second sub-cores 231 are respectively connected to the floor core 21 and the second sub-cores 231 are connected to the second main core 221.

The packing belt is used for packing the upper core group 1 and the lower core group 2 into a whole; so that the upper core group 1 and the lower core group 2 are assembled to form a cavity.

Specifically, as shown in fig. 6, 8, 9, and 13, a plurality of first vent holes 111 are formed in the top cover core 11, the first main sand core 121 includes a plurality of first connecting columns 1211, the first auxiliary sand core 131 includes a plurality of second connecting columns 1311, and the first connecting columns 1211 and the second connecting columns 1311 are adapted to be inserted into the first vent holes 111 in a one-to-one correspondence manner, so that the first main sand core 121 and the first auxiliary sand core 131 are respectively connected with the top cover core 11, and the connection is stable, which can improve the stability of the entire mold.

Specifically, as shown in fig. 7, 10, 11, 12, and 14, a plurality of second ventilation holes 211 are formed in the bottom plate core 21, the second main sand core 221 includes a plurality of third connection posts 2211, the second auxiliary sand core 231 includes a plurality of fourth connection posts 2311, the third connection posts 2211 and the fourth connection posts 2311 are suitable for being inserted into the second ventilation holes 211 in a one-to-one correspondence manner, so that the second main sand core 221 and the second auxiliary sand core 231 are respectively connected with the bottom plate core 21, and gas generated by the first main sand core 121, the first auxiliary sand core 131, the second main sand core 221 and the second auxiliary sand core 231 can be smoothly discharged out of the mold through the first ventilation holes 111 and the second ventilation holes 211, so that casting defects are reduced.

Specifically, as shown in fig. 7, 15 and 17, the upper core set 1 and the lower core set 2 are assembled to form a cavity, the top cover core 11 is provided with a plurality of cavity exhaust slots 112, and each cavity exhaust slot 112 is communicated with the cavity to form a cavity exhaust channel 41; the outlets of the plurality of first vent holes 111 and the plurality of second vent holes 211 are communicated to form the core exhaust channel 42; the bottom plate core 21 is provided with a plurality of pouring inlets 212, and the pouring inlets 212 are communicated to form a pouring channel 43.

It should be noted that fig. 15-17 are overall structural diagrams of the sand core after the sand box 9 is taken out after the casting of the whole sand core is completed, wherein the marked cavity vent channel 41, the core vent channel 42 and the casting channel 43 are all formed by the casting material through post-condensation, and need to be removed together when the whole sand core, i.e. the upper core group 1 and the lower core group 2, is knocked out.

Specifically, as shown in fig. 2, 3 and 17, the top cover core 11 is provided with a plurality of fire-sealing grooves 113, the casting sand 91 in the sand box 9 is molded into a fire-sealing wall 1131 along the fire-sealing grooves 113, the fire-sealing wall 1131 separates the core exhaust channel 42 from the cavity exhaust channel 41, and separates the riser 114 from the core exhaust channel 42.

It is worth mentioning that in the casting process of the casting 6, cavity venting and sand mold venting are particularly important, and it is necessary to ensure that the cavity venting channel 41 is unblocked at the moment of casting, so that the cavity venting groove 112 and the first sand core venting groove are formed on the top cover core 11, and the second sand core venting groove is formed on the bottom plate core 21, so that the size of the venting channel can be enlarged, the venting capacity can be increased, and the weight of the whole mold can be reduced, so as to ensure the unblocked venting in the casting process, and the first core venting channel 42, the cavity venting channel 41, the riser and the first core venting channel 42 can be separated by the casting sand 91 in the sand box 9 along the fire-sealing wall 1131 formed by the fire-sealing groove 113, so that the vent channels can be effectively prevented from communicating with each other, the product yield can be improved, and the cost can be reduced.

In the present embodiment, as shown in fig. 17, the number of the fire banking grooves 113 is three, which are provided on a surface of the cap core 11 on a side away from the first frame core 12, i.e., an outer side surface, and preferably, which are respectively provided between the core vent passage 42 and the cavity vent passage 41, between the riser 114 and the cavity vent passage 41, and between the riser 114 and the core vent passage 42.

Specifically, as shown in fig. 4 and 5, the upper core set 1 and the lower core set 2 are both provided with two limiting grooves 3 for fixing the packing belt 31, and the two limiting grooves 3 are symmetrically arranged.

Specifically, as shown in fig. 8 to 11, the first auxiliary sand core 131 includes a first supporting portion 1313 and a first connecting portion 1312, the first connecting portion 1312 is adapted to be connected to the first main sand core 121, the first frame core 12 is provided with a plurality of first positioning grooves 122, and the first supporting portion 1313 is adapted to be fitted in the first positioning grooves 122; the second sub-sand core 231 comprises a second supporting portion 2313, a second connecting portion 2312 and a third connecting portion 2314, the second connecting portion 2312 is suitable for being connected with the second main sand core 221, the third connecting portion 2314 is suitable for being connected with the first main sand core 121, a plurality of second positioning grooves 222 are formed in the second frame core 22, and the second supporting portion 2313 is suitable for being assembled in the second positioning grooves 222.

It should be noted that the number of the first sub-cores 131 is plural, the shapes of the first sub-cores 131 are not completely uniform, some of the first sub-cores 131 include the first supporting portion 1313 and the first connecting portion 1312, some of the first sub-cores 131 include only the first connecting portion 1312 and the second connecting post 1311, some of the second sub-cores 231 include only the second supporting portion 2313, the second connecting portion 2312 and the third connecting portion 2314, and some of the second sub-cores 231 include only the second connecting portion 2312, the third connecting portion 2314 and the fourth connecting post 2311.

Preferably, the plurality of first sub-cores 131 are spaced apart from each other and independent from each other, that is, the first sub-cores 131 are separately manufactured according to installation positions thereof, and the plurality of second sub-cores 231 are spaced apart from each other and independent from each other, that is, the second sub-cores 231 are separately manufactured according to installation positions thereof, and the shape of the first connection portion 1312 is fitted to the shape of the connection position of the first main core 121 and the first sub-cores 131, in the present embodiment, the first connection portion 1312 of the first sub-core 131 is erected on the shaft of the first main core 121, and thus the first connection portion 1312 is provided in an arch shape adapted to be erected on the shaft, the shape of the second connection portion 2312 is fitted to the shape of the connection position of the second main core 221 and the second sub-core 231, and the shape of the third connection portion 2314 is fitted to the shape of the connection position of the first main core 121 and the second sub-cores 231, the second secondary core 231 is between the first and second main cores 121 and 221, and the second and third connections 2312 and 2314 on the second secondary core 231 are connected to the shafts of the first and second main cores 121 and 221, respectively, so the second and third connections 2312 and 2314 are also arranged in an arch shape.

The application also provides a manufacturing method of the core pack for casting the hydraulic multi-way valve, which comprises the following steps as shown in figure 1: manufacturing an upper core group 1: respectively manufacturing a top cover core 11, a first frame core 12 and a plurality of first auxiliary sand cores 131, forming a first main sand core 121 on the first frame core 12, respectively installing each first auxiliary sand core 131 on the top cover core 11, assembling the first frame core 12 on the top cover core 11, connecting the first main sand core 121 with the top cover core 11, and connecting each first auxiliary sand core 131 with the first main sand core 121.

And (3) manufacturing a lower core group 2: the floor core 21, the second frame core 22, and the plurality of second sub-cores 231 are separately manufactured, the second main core 221 is molded on the second frame core 22, the second frame core 22 is assembled to the floor core 21, the second main core 221 is connected to the floor core 21, the second sub-cores 231 are separately mounted to the second frame core 22, the second sub-cores 231 are separately connected to the floor core 21, and the second sub-cores 231 are connected to the second main core 221.

Packaging: providing a packing machine, assembling the upper core group 1 and the lower core group 2, and packing the upper core group 1 and the lower core group 2 into a whole by the packing machine through a packing belt 31; it is worth mentioning that the connection between the conventional mould adopts bolt-up connection usually, but bolt-up connection can occupy the psammitolite space usually to with high costs, connect not only convenient and fast through packing area 31, its low price can effectively reduce the cost moreover, can not occupy the psammitolite space yet, saves the link that the mould punched and assembled the bolt, improves production efficiency.

It should be noted that each first auxiliary sand core 131 is detachably connected with the first main sand core 121 and the top cover core 11, each second auxiliary sand core 231 is detachably connected with the second main sand core 221 and the bottom plate core 21, each second auxiliary sand core 231 is detachably connected with the first main sand core 121, the separate manufacture of the second auxiliary sand core can reduce the manufacture difficulty of the sand cores and facilitate transportation, meanwhile, the parts can be connected with each other, the integrity after connection is further enhanced, and the situation that the sand cores are easy to deform and break during integrated manufacture can be avoided, wherein the top cover core 11 can be assembled with the first frame core 12, the bottom cover core can be assembled with the second frame core 22 and connected through clamping and the like, the upper core set 1 and the lower core set 2 are quickly connected, the assembly of the mold is completed, the forming speed of the parts is high, the production efficiency is high, the connection relation between the first auxiliary sand core 131 and the top cover core 11 and the first main sand core 121 can be enhanced, The connection relation between the second auxiliary sand core 231 and the bottom plate core 21 and the second main sand core 221, the connection relation between the first main sand core 121 and the top cover core 11 and the connection relation between the second main sand core 221 and the bottom plate core 21 are favorable for improving the tightness of the combination of the first auxiliary sand core 131 and the second auxiliary sand core 231 with the whole mold, the assembly between the upper core set 1 and the lower core set 2 is rapid and efficient, the overall stability of the mold can be effectively improved, the internal shape of the casting 6 of the precisely molded multi-way valve is improved, and the quality of finished products is improved.

Preferably, the top cover core 11 and the first frame core 12 and the bottom plate core 21 and the second frame core 22 may be assembled by engaging; the clamping mode comprises a connection mode of a clamping block and a clamping groove, and the clamping block and the clamping groove can be respectively arranged at four corners of the top cover core 11, the first frame core 12, the second frame core 22 and the bottom plate core 21.

Specifically, as shown in fig. 1, the packing step further includes the following steps before: coating: the upper core group 1 and the lower core group 2 are dipped into the coating and then lifted out for hanging.

Drying: and drying the upper core set 1 and the lower core set 2 obtained in the coating step by using drying equipment.

The present application also provides a casting method of the multi-way valve, as shown in fig. 2, 6, and 15, a core pack packed as one body is prepared according to the manufacturing method of the core pack for hydraulic multi-way valve casting.

Moving the core group into a sand box 9 filled with casting sand 91, wherein a liquid inlet channel 44, a liquid outlet channel 45 and a cap 115 are formed in the sand box 9, a pouring outlet 116 is formed on the top cover core 11, the cap 115 is suitable for being covered on the pouring outlet 116, pouring materials flow into the cap 115 through the pouring outlet 116 to form a riser 114, the liquid inlet channel 44 is communicated with the pouring inlet 212, and the liquid outlet channel 45 is communicated with the pouring outlet 116.

And the casting machine performs casting through the liquid injection channel 44 of the sand box 9 to finally obtain the hydraulic multi-way valve, namely the casting 6.

Preferably, the connection manner of the first connection column 1211 and the second connection column 1311 and the first vent hole 111 may be a snap fit or an interference fit, and when the connection manner is the interference fit, the diameter of the first connection column 1211 and the diameter of the second connection column 1311 are slightly larger than the diameter of the first vent hole 111.

Specifically, as shown in fig. 18, a ceramic core bar 8 is placed at the plunger position corresponding to the upper core group 1 and the lower core group 2, and the prepared hydraulic multiway valve, namely the casting 5, is in a multiway plunger shape; the hydraulic multi-way valve obtained by pouring is provided with a plurality of sand outlets 7, the sand outlets 7 are arranged on the first frame core 12 and the second frame core 22, a parting surface 51 is formed between the upper core group 1 and the lower core group 2, and the parting surface 51 is positioned on the sand outlets 7.

It is worth mentioning that the molding of the equipment adopts HWS static pressure line production, the core making adopts a vertical parting hot core machine and a horizontal parting hot core machine, and the core assembling adopts a mechanical arm; as shown in fig. 19, the casting 6 process is: the casting 6 is made of QT500-7, the weight of the casting 6 is 110kg, the outline dimension is 430 multiplied by 264 multiplied by 162mm, the internal shape is a multi-way plunger shape, the internal section is large in thickness, and the wall thickness difference is great. The casting shrinkage was measured at 0.8%, as shown in FIGS. 13-14, and the bottom was filled with water and the top was placed with a hot riser 114 for casting; wherein, the gating system adopts the semi-open type: f, directly: f, horizontal movement: f, inner =1:1.7:1.4, and the casting speed is 12-16 seconds.

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims

1. The utility model provides a core group for hydraulic pressure multiple unit valve casting which characterized in that includes:

2. The hydraulic multi-way valve casting core pack as recited in claim 1, wherein: the top cover core is provided with a plurality of first vent holes, the first main sand core comprises a plurality of first connecting columns, the first auxiliary sand core comprises a plurality of second connecting columns, and the first connecting columns and the second connecting columns are suitable for being inserted into the first vent holes in a one-to-one correspondence manner;

the bottom plate core is provided with a plurality of second vent holes, the second main sand core comprises a plurality of third connecting columns, the second auxiliary sand core comprises a plurality of fourth connecting columns, and the third connecting columns and the fourth connecting columns are suitable for being inserted into the second vent holes in a one-to-one correspondence mode.

3. The hydraulic multi-way valve casting core pack as recited in claim 2, wherein: a plurality of cavity exhaust grooves are formed in the top cover core, and each cavity exhaust groove is communicated with the cavity to form a cavity exhaust channel;

outlets of the first vent holes and the second vent holes are communicated to form a core exhaust channel;

a plurality of pouring inlets are formed in the bottom plate core, and the pouring inlets are communicated to form a pouring channel.

4. The hydraulic multi-way valve casting core pack of claim 3, wherein: and the top cover core is provided with a plurality of fire sealing grooves, and casting sand is suitable for forming a fire sealing wall along the fire sealing grooves so as to be used for separating the core exhaust channel from the cavity exhaust channel and separating the riser from the core exhaust channel.

5. The hydraulic multi-way valve casting core pack as recited in claim 1, wherein: the upper core group and the lower core group are provided with two limiting grooves for fixing the packing belt, and the two limiting grooves are symmetrically arranged.

6. The hydraulic multi-way valve casting core pack as recited in claim 1, wherein: the first auxiliary sand core comprises a first supporting part and a first connecting part, the first connecting part is suitable for being connected with the first main sand core, a plurality of first positioning grooves are formed in the first frame core, and the first supporting part is suitable for being assembled in the first positioning grooves;

the second auxiliary sand core comprises a second supporting part, a second connecting part and a third connecting part, the second connecting part is suitable for being connected with the second main sand core, the third connecting part is suitable for being connected with the first main sand core, a plurality of second positioning grooves are formed in the second frame core, and the second supporting part is suitable for being assembled in the second positioning grooves.

7. The method for manufacturing a core pack for hydraulic multi-way valve casting according to any one of claims 1 to 6, comprising the steps of:

8. The method of manufacturing a core pack for hydraulic multi-port valve casting according to claim 7, wherein: the packaging step also comprises the following steps before:

9. A method of casting a multi-way valve, comprising the steps of:

preparing an integrally packed core pack according to the method of claim 7;

moving the core group to a sand box filled with casting sand, wherein a liquid inlet channel, a liquid outlet channel and a cap are formed in the sand box, a pouring outlet is formed in the top cover core, the cap is suitable for being inversely covered on the pouring outlet, pouring materials flow into the cap through the pouring outlet to form a riser, the liquid inlet channel is communicated with the pouring inlet, and the liquid outlet channel is communicated with the pouring outlet;

10. A method of casting a multi-way valve as defined in claim 9, wherein: a ceramic core rod is placed at the plunger position corresponding to the upper core group and the lower core group, and the manufactured hydraulic multi-way valve is in a multi-way plunger shape; the hydraulic multi-way valve obtained by pouring is provided with a plurality of sand outlet channels, the sand outlet channels are arranged on the first frame core and the second frame core, a parting surface is formed between the upper core group and the lower core group, and the parting surface is positioned on the sand outlet channels.