CN108705046A - A kind of large-duty loader hydraulic valve casting die and manufacturing method - Google Patents

A kind of large-duty loader hydraulic valve casting die and manufacturing method Download PDF

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Publication number
CN108705046A
CN108705046A CN201810648254.2A CN201810648254A CN108705046A CN 108705046 A CN108705046 A CN 108705046A CN 201810648254 A CN201810648254 A CN 201810648254A CN 108705046 A CN108705046 A CN 108705046A
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China
Prior art keywords
core
arbor
mounting groove
sand
small
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CN201810648254.2A
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Chinese (zh)
Inventor
石慧亮
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Rugao Yan Da Machinery Industry Co Ltd
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Rugao Yan Da Machinery Industry Co Ltd
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Priority to CN201810648254.2A priority Critical patent/CN108705046A/en
Publication of CN108705046A publication Critical patent/CN108705046A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/082—Sprues, pouring cups
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/007—Treatment of the fused masses in the supply runners

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention discloses a kind of large-duty loader hydraulic valve casting dies, including upper and lower shell mould, sand core and pouring and riser systems, sand core includes core print, main core and small core, main core is made of horizontally disposed seven in the same plane longitudinal arbors and four lateral arbors, main core is equipped with multiple convex blocks, convex block is equipped with mounting groove, and small core is fixed by mounting groove and main core, and pouring and riser systems include the heat preservation riser of two diameter 90mm, height 120mm.Advantage compact, highly reliable, ease of assembly casting reasonable for structure of the present invention, it controls main valve hole cast blank straightness and is less than 0.8 millimeter, avoid complicated assembly of sand core error, solve the casting flaws such as casting shrinkage cavity and porosity, internal porosity, improve dense internal organization, No leakage under high-pressure work state to reach rated pressure >=35Mpa, casting qualification rate greatly improve, and casting cost reduces.

Description

A kind of large-duty loader hydraulic valve casting die and manufacturing method
Technical field
The present invention relates to mechanical equipment manufacturing technology field more particularly to a kind of large-duty loader hydraulic valve casting dies And manufacturing method.
Background technology
The overwhelming majority has hydraulic control system in large-duty loader now, and hydraulic system is by hydraulic pump, control valve, liquid The power of engine is passed to hydraulic pressure by the compositions such as cylinder pressure, hydraulic motor, pipeline, fuel tank, Hydraulic Power Transmission System by hydraulic pump The executive components such as motor, hydraulic cylinder, push the work forward device action, to complete various operations.
Hydraulic valve is hydraulic system key components and parts, and the hydraulic pressure valve arrangement of large-duty loader and required precision are very high, and It is required that the No leakage under the high-pressure work state of pressure >=35Mpa.
Since the inner flow passage of valve body moulding is complicated, can not one-pass molding, sand core need to pass through main core and many small cores Assemble at many levels step by step, usually will produce gap error in an assembling process, and casting will appear shrinkage cavity and porosity, The casting flaws such as internal porosity can not ensure dense internal organization, and hair is easy under the high-pressure work state of pressure >=35Mpa Raw leakage causes product casting qualification rate low, and casting cost is high.
Invention content
In light of the defects in the prior art, the purpose of the invention is to provide a kind of reasonable for structure compact, highly reliable, interior Portion's dense structure's property is high, ease of assembly is cast, and product casting qualification rate greatly improves, the large-duty loader liquid that casting cost reduces Pressure valve body casting die and manufacturing method.
In order to solve the above technical problem, the present invention provides a kind of large-duty loader hydraulic valve casting dies, including Cope shell, drag sheel, sand core and pouring and riser systems；
The cavity of large-duty loader hydraulic valve is formed after the cope shell, drag sheel molding with the sand core；
The sand core includes core print, main core and small core, and the core print is four frames, and front and rear sides frame is equipped with two feet, The main core is horizontally set in core print, and the core print supports main core to fixed, and the main core is by horizontal in the same plane Seven longitudinal arbors being arranged and four lateral arbor compositions, described seven longitudinal arbors include arranged in parallel successively from left to right First longitudinal direction arbor, second longitudinal direction arbor, third longitudinal direction arbor, the 4th longitudinal arbor, the 5th longitudinal arbor, the 6th longitudinal core Bone and the 7th longitudinal arbor, described four lateral arbors include the first lateral arbor arranged in parallel, second successively from front to back The lateral arbor of lateral arbor, third transverse direction arbor and the 4th；
The first longitudinal direction arbor is connected with four lateral arbors in latticed to Article 6 longitudinal direction arbor, and described first Lateral arbor is connected to third transverse direction arbor with the 7th longitudinal arbor, the described 4th lateral arbor not with the 7th longitudinal arbor phase Connection；
It is located on the first longitudinal direction arbor to the 6th longitudinal arbor between the first lateral arbor and the second lateral arbor The first convex block, the second convex block and third convex block for being used to form oil groove, the first longitudinal direction arbor to the 6th are equipped in region It is located to be equipped in the region between third transverse direction arbor and the 4th lateral arbor on longitudinal arbor and is used to form the 4th of oil groove Convex block, the 5th convex block and the 6th convex block are located at the second lateral arbor and the on the first longitudinal direction arbor to the 6th longitudinal arbor It is equipped with the 7th convex block for being used to form oil groove on region between three lateral arbors；First convex block is equipped with upward the One mounting groove, the 6th convex block are equipped with the second upward mounting groove, and the third convex block is equipped with downward third and installs Slot, the 4th convex block are equipped with the 4th downward mounting groove, and the 7th convex block upper and lower ends are respectively equipped with the 5th mounting groove With the 6th mounting groove, set respectively in the region being located on the first lateral arbor and the 4th lateral arbor on the 6th longitudinal arbor There are the 7th mounting groove and the 8th mounting groove；
The small core is three layers, is followed successively by from the top down：First layer includes a first small core, and the second layer includes six the Two small cores, third layer include six small cores of third, and each second small core passes through the first mounting groove, the second mounting groove and the 5th installation Slot is fixed with main core, and each small core of third is fixed by third mounting groove, the 4th mounting groove and the 6th mounting groove and main core, each It is equipped with the 9th mounting groove among second small core upper surface, the first small core passes through the 7th mounting groove and the 8th mounting groove and main core Fixed, the first small core is fixed by the 9th mounting groove and the second small core；
The pouring and riser systems include two heat preservation riser and two running channels, the heat preservation riser it is a diameter of 90mm is highly 120mm, and the riser surrounding is filled with resin sand, and the running channel is located at the left and right of the cope shell, drag sheel Both sides.
Specifically, the arc surface on the described first small core, six the second small cores and six small cores of third uses loose piece and pumping Core cylinder makes and one-pass molding.
Specifically, the 5th mounting groove and the 6th mounting groove are round notches, first mounting groove, the second installation Slot, third mounting groove, the 4th mounting groove, the 7th mounting groove, the 8th mounting groove and the 9th mounting groove are rectangular notches.
Specifically, the sand core is high fluidity sand with sand.
Specifically, described seven longitudinal arbors are made of the High-Alumina ceramic rod of a diameter of 10mm, the High-Alumina pottery The Al of porcelain stick2O3Content is 40%--50%.
Specifically, the assembly of sand core gap is to be sticked with tooling control by sand core.
Specifically, the main core is with Special core production Mold Making and to be integrally formed.
Correspondingly, the present invention also provides a kind of manufacturing methods of large-duty loader hydraulic valve casting, including following step Suddenly：
S1：It checks the Special core production mold for making main core, and the dirt on mold is cleaned out, use a diameter of 10mm High-Alumina ceramic rod as seven in main core longitudinal arbors, the Al of High-Alumina ceramic rod2O3Content is 40%--50%, is made It is high fluidity sand, 180 DEG C -190 DEG C, shooting pressure 0.5MPa-0.6MPa, shooting time 5s-7s of heating temperature, solidification with sand Time 100s-120s；
S2：Small core is made using common hydraulic press self-control Special core making machine, on the first small core, the second small core and the small core of third Circular arc concave surface made of loose piece and core pulling cylinder and one-pass molding；
S3：All burrs on sand core are pared off, transition nozzle is removed, being sticked with tooling by sand core fixes main core, first will most bottom The small core of third of layer is assembled into main core, after to be bonded dose solidifies completely, assembled sand core is turned over and is glued again by sand core Tooling processed is fixed, and successively the second small core and the small core of third are assembled into main core, and the assembly clearance for controlling sand core is less than 0.1mm, Then main core is horizontally set in core print, loam core cannot have the gap with loam core interface, there can not be extra adhesive；
S4：Sand core is horizontally set on cope shell, in drag sheel, hydraulic pressure is formed after cope shell, drag sheel and sand core molding Cope shell, drag sheel are embedded in sandbox by the cavity of valve body, the cavity between cope shell, drag sheel outer surface and sandbox inside It is covered with layer of sand, the pouring and riser systems being connected to shell mould are equipped in layer of sand, pouring and riser systems use two heat preservation riser and two Running channel, a diameter of 90mm of heat preservation riser are highly 120mm, and riser surrounding is filled with resin sand；
S5：Pouring molten iron index, using the silicon rare earth of the silicon strontium inovulant and mass fraction 0.2% of mass fraction 0.3% Inovulant progress is compound inoculated, and in cast, molten iron passes through the thin cast gate dispersion water inlet in upper and lower shell mould both sides, pouring temperature 1380 DEG C -1420 DEG C, duration of pouring 25s-28s, 1520 DEG C -1540 DEG C of tapping temperature.
The present invention has the advantages that：
1. compact, highly reliable, the ease of assembly casting reasonable for structure of hydraulic valve casting die；
2. the High-Alumina ceramic rod (Al2O3 contents is 40%--50%) of the diameter 10mm used is used as sprue arbor, It controls main valve hole cast blank straightness and is less than 0.8 millimeter；
3. using the sand of high fluidity, complete molding and the quality of sand core ensure that；
4. being sticked with tooling using sand core, complicated assembly of sand core error is avoided, the assembly clearance of sand core is controlled in 0.1mm It is interior；
5. using resin sand between two riser, compound inoculated, mould is carried out using silicon strontium inovulant and silicon rare earth inovulant The water inlet of the tool left and right sides, solves the casting flaws such as casting shrinkage cavity and porosity, internal porosity, improves dense internal organization, with Reach No leakage under the high-pressure work state of rated pressure >=35Mpa；
6. casting qualification rate greatly improves, casting cost reduces.
Description of the drawings
It, below will be to required in embodiment or description of the prior art in order to illustrate more clearly of technical scheme of the present invention The attached drawing used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, right For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings Its attached drawing.
Fig. 1 is the first structure schematic diagram of sand core of the present invention；
Fig. 2 is the second structural schematic diagram of sand core of the present invention；
Fig. 3 is the left view of sand core of the present invention：
Fig. 4 is the first structure schematic diagram of main core of the present invention；
Fig. 5 is the vertical view of main core of the present invention；
Fig. 6 is the second structural schematic diagram of main core of the present invention；
Fig. 7 is the structural schematic diagram of the second small core of the invention.
Wherein, reference numeral corresponds in figure：1- core prints, 2- main cores, 3- first longitudinal direction arbors, 4- second longitudinal direction arbors, 5- thirds longitudinal direction arbor, the longitudinal arbors of 6- the 4th, the longitudinal arbors of 7- the 5th, the longitudinal arbors of 8- the 6th, the longitudinal arbors of 9- the 7th, The lateral arbors of 10- first, the lateral arbors of 11- second, 12- third transverse direction arbors, the lateral arbors of 13- the 4th, the first convex blocks of 14-, The second convex blocks of 15-, 16- third convex blocks, the 4th convex blocks of 17-, the 5th convex blocks of 18-, the 6th convex blocks of 19-, the 7th convex blocks of 20-, 21- One mounting groove, the second mounting grooves of 22-, 23- third mounting grooves, the 4th mounting grooves of 24-, the 5th mounting grooves of 25-, 26- the 6th are installed Slot, the 7th mounting grooves of 27-, the 8th mounting grooves of 28-, the first small cores of 29-, the second small cores of 30-, the small core of 31- thirds, 32- the 9th pacify Tankage.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, is carried out to the technical solution in inventive embodiments clear, complete Ground describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this The embodiment of invention, the every other reality that those of ordinary skill in the art are obtained under the premise of not making creative work Example is applied, shall fall within the protection scope of the present invention.
Embodiment：
- Fig. 7 is please referred to Fig.1, the present invention provides a kind of large-duty loader hydraulic valve casting die, including cope shell, Drag sheel, sand core and pouring and riser systems；
The cavity of large-duty loader hydraulic valve is formed after the cope shell, drag sheel molding with the sand core；
The sand core includes core print 1, main core 2 and small core, and the core print 1 is four frames, and front and rear sides frame is equipped with two Foot, the main core 2 are horizontally set in core print 1, and the core print 1 supports main core 2 to fixed, and the main core 2 is by same flat Horizontally disposed seven longitudinal arbors and four lateral arbors compositions in face, described seven longitudinal arbors include from left to right successively Longitudinal the 6, the 5th longitudinal core of arbor of first longitudinal direction arbor 3 arranged in parallel, second longitudinal direction arbor 4, third longitudinal direction arbor the 5, the 4th Longitudinal 8 and the 7th longitudinal arbor 9 of arbor of bone the 7, the 6th, described four articles lateral arbors include from front to back successively arranged in parallel the One the 10, second lateral arbor 11 of lateral arbor, third transverse direction arbor 12 and the 4th lateral arbor 13；
The first longitudinal direction arbor 3 is connected with four lateral arbors in latticed to Article 6 longitudinal direction arbor 8, and described the One lateral arbor 10 is connected to third transverse direction arbor 12 with the 7th longitudinal arbor 9, and the 4th transverse direction arbor 13 is not with the 7th Longitudinal arbor 9 is connected；
It is located at 10 and second lateral arbor 11 of the first lateral arbor on 3 to the 6th longitudinal direction arbor 8 of the first longitudinal direction arbor Between region in be equipped with the first convex block 14, the second convex block 15 and third convex block 16 for being used to form oil groove, described first is vertical It is located in the region between third transverse direction arbor 12 and the 4th lateral arbor 13 on 3 to the 6th longitudinal direction arbor 8 of arbor and is equipped with It is used to form the 4th convex block 17, the 5th convex block 18 and the 6th convex block 19 of oil groove, the longitudinal core of the first longitudinal direction arbor 3 to the 6th It is located to be equipped on the region between the second lateral arbor 11 and third transverse direction arbor 12 on bone 8 and is used to form the 7th convex of oil groove Block 20；First convex block 14 is equipped with the first upward mounting groove 21, and the 6th convex block 19 is equipped with the second upward peace Tankage 22, the third convex block 16 are equipped with downward third mounting groove 23, and the 4th convex block 17 is equipped with downward the 4th Mounting groove 24,20 upper and lower ends of the 7th convex block are respectively equipped with the 5th mounting groove 25 and the 6th mounting groove 26, and the described 6th is vertical The 7th mounting groove 27 and the are respectively equipped in the region being located on arbor 8 on first lateral arbor 10 and the 4th lateral arbor 13 Eight mounting grooves 28；
The small core is three layers, is followed successively by from the top down：First layer includes a first small core 29, and the second layer includes six Second small core 30, third layer include the small core 31 of six thirds, and each second small core 30 passes through the first mounting groove 21, the second mounting groove 22 and the 5th mounting groove 25 fixed with main core 2, each small core 31 of third passes through third mounting groove 23, the 4th mounting groove 24 and the 6th Mounting groove 26 is fixed with main core 2, and the 9th mounting groove 32 is equipped among each second small core, 30 upper surface, and the first small core 29 is logical It crosses the 7th mounting groove 27 and the 8th mounting groove 28 is fixed with main core 2, the first small core 29 passes through the 9th mounting groove 32 and second Small core 30 is fixed；
The pouring and riser systems include two heat preservation riser and two running channels, the heat preservation riser it is a diameter of 90mm is highly 120mm, and the riser surrounding is filled with resin sand, and the running channel is located at the left and right of the cope shell, drag sheel Both sides
Specifically, the arc surface on 29, six the second small cores 30 of the first small core and the small core of six thirds 31 using loose piece and Core pulling cylinder makes and one-pass molding.
Specifically, the 5th mounting groove 25 and the 6th mounting groove 26 are round notches, the first mounting groove 21, the second mounting groove 22, third mounting groove 23, the 4th mounting groove 24, the 7th mounting groove 27, the 8th mounting groove 28 and the 9th mounting groove 32 are square grooves Mouthful.
Specifically, sand core is high fluidity sand with sand.
Specifically, seven longitudinal arbors are made of the High-Alumina ceramic rod of a diameter of 10mm, the High-Alumina ceramic rod Al2O3 contents be 40%--50%.
Specifically, assembly of sand core gap is to be sticked with tooling control by sand core.
Specifically, main core 2 is with Special core production Mold Making and to be integrally formed.
Correspondingly, present invention provides a kind of production methods of large-duty loader hydraulic valve casting, including following step Suddenly：
S1：It checks the Special core production mold for making main core, and the dirt on mold is cleaned out, use a diameter of 10mm High-Alumina ceramic rod as seven in main core longitudinal arbors, the Al2O3 contents of High-Alumina ceramic rod are 40%--50%, are made It is high fluidity sand with sand, specially golden jade-like stone B570US model high fluidity sand, 180 DEG C -190 DEG C of heating temperature, shooting pressure 0.5MPa-0.6MPa, shooting time 5s-7s, hardening time 100s-120s；
S2：Small core is made using common hydraulic press self-control Special core making machine, on the first small core, the second small core and the small core of third Circular arc concave surface made of loose piece and core pulling cylinder and one-pass molding；
S3：All burrs on sand core are pared off, transition nozzle is removed, being sticked with tooling by sand core fixes main core, first will most bottom The small core of third of layer is assembled into main core, after to be bonded dose solidifies completely, assembled sand core is turned over and is glued again by sand core Tooling processed is fixed, and successively the second small core and the small core of third are assembled into main core, and the assembly clearance for controlling sand core is less than 0.1mm, Then main core is horizontally set in core print, loam core cannot have the gap with loam core interface, there can not be extra adhesive；
S4：Sand core is horizontally set on cope shell, in drag sheel, hydraulic pressure is formed after cope shell, drag sheel and sand core molding Cope shell, drag sheel are embedded in sandbox by the cavity of valve body, the cavity between cope shell, drag sheel outer surface and sandbox inside It is covered with layer of sand, the pouring and riser systems being connected to shell mould are equipped in layer of sand, pouring and riser systems use two heat preservation riser and two Running channel, a diameter of 90mm of heat preservation riser are highly 120mm, and riser surrounding is filled with resin sand；
S5：Pouring molten iron index, using the silicon rare earth of the silicon strontium inovulant and mass fraction 0.2% of mass fraction 0.3% Inovulant progress is compound inoculated, and in cast, molten iron passes through the thin cast gate dispersion water inlet in upper and lower shell mould both sides, pouring temperature 1380 DEG C -1420 DEG C, duration of pouring 25s-28s, 1520 DEG C -1540 DEG C of tapping temperature.
The present invention has the advantages that：
1. compact, highly reliable, ease of assembly casting reasonable for structure；
2. the High-Alumina ceramic rod (Al2O3 contents is 40%--50%) of diameter 10mm is used to be used as sprue arbor, control It has made main valve hole cast blank straightness and has been less than 0.8 millimeter；
3. using the sand of high fluidity, complete molding and the quality of sand core ensure that；
4. being sticked with tooling using sand core, complicated assembly of sand core error is avoided, the assembly clearance of sand core is controlled in 0.1mm It is interior；
5. using resin sand between two riser, compound inoculated, mould is carried out using silicon strontium inovulant and silicon rare earth inovulant The water inlet of the tool left and right sides, solves the casting flaws such as casting shrinkage cavity and porosity, internal porosity, improves dense internal organization, with Reach No leakage under the high-pressure work state of rated pressure >=35Mpa；
6. casting qualification rate greatly improves, casting cost reduces.
Above disclosed is only several preferred embodiments of the present invention, cannot limit the power of the present invention with this certainly Sharp range, therefore equivalent changes made in accordance with the claims of the present invention, are still within the scope of the present invention.

Claims (8)

1. a kind of large-duty loader hydraulic valve casting die, which is characterized in that emitted including cope shell, drag sheel, sand core and pouring System；
The cavity of large-duty loader hydraulic valve is formed after the cope shell, drag sheel molding with the sand core；
The sand core includes core print (1), main core (2) and small core, and the core print (1) is four frames, and front and rear sides frame is equipped with two Foot, the main core (2) are horizontally set in core print (1), and the core print (1) is to fixed support main core (2), the main core (2) it is made of horizontally disposed seven in the same plane longitudinal arbors and four lateral arbors, described seven longitudinal arbor packets Include first longitudinal direction arbor (3) arranged in parallel, second longitudinal direction arbor (4), third longitudinal direction arbor (5), the 4th successively from left to right Longitudinal arbor (6), the 5th longitudinal arbor (7), the 6th longitudinal arbor (8) and the 7th longitudinal arbor (9), described four lateral arbors Including the arranged in parallel first lateral arbor (10), the second lateral arbor (11), third transverse direction arbor (12) successively from front to back With the 4th lateral arbor (13)；
The first longitudinal direction arbor (3) is connected with four lateral arbors in latticed to Article 6 longitudinal direction arbor (8), and described the One lateral arbor (10) is connected to third transverse direction arbor (12) with the 7th longitudinal arbor (9), the described 4th lateral arbor (13) It is not connected with the 7th longitudinal arbor (9)；
It is located at the first lateral arbor (10) and the second lateral arbor on the first longitudinal direction arbor (3) to the 6th longitudinal arbor (8) (11) the first convex block (14), the second convex block (15) and third convex block (16) for being used to form oil groove are equipped in the region between, It is located at third transverse direction arbor (12) and the 4th lateral arbor (13) on the first longitudinal direction arbor (3) to the 6th longitudinal arbor (8) Between region in be equipped with the 4th convex block (17), the 5th convex block (18) and the 6th convex block (19) for being used to form oil groove, it is described It is located on first longitudinal direction arbor (3) to the 6th longitudinal arbor (8) between the second lateral arbor (11) and third transverse direction arbor (12) Region on be equipped with the 7th convex block (20) for being used to form oil groove；First convex block (14) is equipped with the first upward installation Slot (21), the 6th convex block (19) are equipped with upward the second mounting groove (22), and the third convex block (16) is equipped with downward Third mounting groove (23), the 4th convex block (17) is equipped with the 4th downward mounting groove (24), the 7th convex block (20) Upper and lower ends are respectively equipped with the 5th mounting groove (25) and the 6th mounting groove (26), are located at first on the described 6th longitudinal arbor (8) It is respectively equipped with the 7th mounting groove (27) and the 8th mounting groove in region on lateral arbor (10) and the 4th lateral arbor (13) (28)；
The small core is three layers, is followed successively by from the top down：First layer includes a first small core (29), and the second layer includes six the Two small cores (30), third layer include six small cores of third (31), and each second small core (30) passes through the first mounting groove (21), second Mounting groove (22) and the 5th mounting groove (25) are fixed with main core (2), and each small core of third (31) passes through third mounting groove (23), the Four mounting grooves (24) and the 6th mounting groove (26) and main core (2) are fixed, and the 9th is equipped among each second small core (30) upper surface Mounting groove (32), the first small core (29) is fixed by the 7th mounting groove (27) and the 8th mounting groove (28) and main core (2), institute It is fixed by the 9th mounting groove (32) and the second small core (30) to state the first small core (29)；
The pouring and riser systems include two heat preservation riser and two running channels, a diameter of 90mm of the heat preservation riser, Height is 120mm, and the riser surrounding is filled with resin sand, and the running channel is located at the left and right sides of the cope shell, drag sheel.
2. large-duty loader hydraulic valve casting die according to claim 1, which is characterized in that the first small core (29), the arc surface on six the second small cores (30) and six small cores of third (31) made of loose piece and core pulling cylinder and once at Type.
3. large-duty loader hydraulic valve casting die according to claim 1, which is characterized in that the 5th mounting groove (25) and the 6th mounting groove (26) is round notch, first mounting groove (21), the second mounting groove (22), third mounting groove (23), the 4th mounting groove (24), the 7th mounting groove (27), the 8th mounting groove (28) and the 9th mounting groove (32) are rectangular notches.
4. large-duty loader hydraulic valve casting die according to claim 1, which is characterized in that the sand core is with sand High fluidity sand.
5. large-duty loader hydraulic valve casting die according to claim 1, which is characterized in that described seven longitudinal cores Bone is made of the High-Alumina ceramic rod of a diameter of 10mm, the Al of the High-Alumina ceramic rod2O3Content is 40%--50%.
6. large-duty loader hydraulic valve casting die according to claim 1, which is characterized in that between the assembly of sand core Gap is to be sticked with tooling control by sand core.
7. large-duty loader hydraulic valve casting die according to claim 1, which is characterized in that the main core (2) is With Special core production Mold Making and it is integrally formed.
8. a kind of production method of large-duty loader hydraulic valve casting, which is characterized in that include the following steps：
S1：It checks the Special core production mold for making main core, and the dirt on mold is cleaned out, use the height of a diameter of 10mm Aluminum ceramic rod is as seven longitudinal arbors in main core, the Al of High-Alumina ceramic rod2O3Content is 40%--50%, uses sand For high fluidity sand, 180 DEG C -190 DEG C, shooting pressure 0.5MPa-0.6MPa, shooting time 5s-7s of heating temperature, hardening time 100s-120s；
S2：Small core, the circle on the first small core, the second small core and the small core of third are made using common hydraulic press self-control Special core making machine Arc concave surface is using loose piece and core pulling cylinder makes and one-pass molding；
S3：All burrs on sand core are pared off, transition nozzle is removed, being sticked with tooling by sand core fixes main core, first by the bottom The small core of third is assembled into main core, after to be bonded dose solidifies completely, assembled sand core is turned over and is sticked with work by sand core again Dress is fixed, and successively the second small core and the small core of third are assembled into main core, and the assembly clearance for controlling sand core is less than 0.1mm, then Main core is horizontally set in core print, loam core cannot have the gap with loam core interface, there can not be extra adhesive；
S4：Sand core is horizontally set on cope shell, in drag sheel, hydraulic valve is formed after cope shell, drag sheel and sand core molding Cavity, by cope shell, drag sheel insertion sandbox, on the inside of cope shell, drag sheel outer surface and sandbox between cavity cover There is layer of sand, the pouring and riser systems being connected to shell mould are equipped in layer of sand, pouring and riser systems use two heat preservation riser and two running channels, A diameter of 90mm of heat preservation riser is highly 120mm, and riser surrounding is filled with resin sand；
S5：Pouring molten iron index is bred using the silicon strontium inovulant of mass fraction 0.3% and the silicon rare earth of mass fraction 0.2% Agent progress is compound inoculated, and in cast, molten iron passes through the thin cast gate dispersion water inlet in upper and lower shell mould both sides, 1380 DEG C of pouring temperature- 1420 DEG C, duration of pouring 25s-28s, 1520 DEG C -1540 DEG C of tapping temperature.
CN201810648254.2A 2018-06-19 2018-06-19 A kind of large-duty loader hydraulic valve casting die and manufacturing method Withdrawn CN108705046A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111283145A (en) * 2020-03-23 2020-06-16 苏州勤美达精密机械有限公司 Novel core assembly process and application

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111283145A (en) * 2020-03-23 2020-06-16 苏州勤美达精密机械有限公司 Novel core assembly process and application

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Application publication date: 20181026