CN111531128A - All-metal gravity casting process and mold for medium-sized thin-wall box-type aluminum castings - Google Patents
All-metal gravity casting process and mold for medium-sized thin-wall box-type aluminum castings Download PDFInfo
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- CN111531128A CN111531128A CN202010495619.XA CN202010495619A CN111531128A CN 111531128 A CN111531128 A CN 111531128A CN 202010495619 A CN202010495619 A CN 202010495619A CN 111531128 A CN111531128 A CN 111531128A
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- 238000005266 casting Methods 0.000 title claims abstract description 154
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 62
- 239000002184 metal Substances 0.000 title claims abstract description 62
- 230000005484 gravity Effects 0.000 title claims abstract description 59
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 54
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000004512 die casting Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- 239000011787 zinc oxide Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
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- 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
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- 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
- B22C9/088—Feeder heads
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- 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
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention relates to an all-metal gravity casting mold for a medium-sized thin-wall box type aluminum casting, which comprises an upper module, a lower module, a left module, a right module, a front module and a rear module which are detachably combined, wherein a mold cavity is formed by the six modules; the lower module is plate-shaped, and the upper surface of the lower module is provided with a sliding chute for mounting the left module and the right module; the left module and the right module are similar and respectively comprise a profile block A and a back plate A, the bottom surfaces of the profile block A and the back plate A are provided with mounting convex strips matched with the sliding grooves, and the profile block A and the back plate A are provided with corresponding positioning pin holes A along the front-back direction; the front module and the rear module are similar and are provided with positioning pin holes B in a penetrating manner along the front-rear direction; the upper template is provided with a mandril plate which can move up and down, and the mandril plate extends into the die cavity through the mandril. An all-metal gravity casting process for medium-size thin-wall box-type aluminum castings is also disclosed. The invention achieves the following beneficial effects: the casting has high quality and low production cost, and can be produced in batch quickly.
Description
Technical Field
The invention relates to the technical field of thin-wall casting metal mold dies and casting, in particular to an all-metal gravity casting process and a mold for medium-sized thin-wall box-type aluminum castings.
Background
A box body and a base aluminum casting (a medium-sized thin-wall box type aluminum casting) used by a pipe cutting and threading machine are cast by a sand mold casting process in the prior art, and are also realized by a die casting process in recent years. The disadvantages of the sand casting process are that the casting surface is rough, the defect rate is high, the structure is large, the production operation time is long, correspondingly, the problems of poor quality, high material cost, high labor cost, low casting production rate and the like exist, and the appearance image of the whole machine product is also poor. The die casting process has the defects that the mechanical property of a casting is lower than that of a metal gravity casting, the manufacturing cost of a die is higher than that of the metal gravity casting, the internal defects of the casting are more than that of the metal gravity casting, the equipment investment is large, the site requirement is high, generally, the single-batch demand (small) of box and machine base castings hardly meets the economic batch requirement of mass production equipment of a die casting machine, and accordingly, the problems of high internal quality, high die cost, high equipment cost, general reluctance to arrange production and the like exist.
The box body aluminum casting of the pipe cutting and threading machine has the characteristics of thin wall, box type or shell type geometric shape, the metal mold casting process of other aluminum castings of the type generally adopts a common sand core or a resin sand core, and an all-metal type scheme is not adopted due to the technical difficulty limitation, so that compared with the all-metal type gravity casting scheme, the inner surface quality is poor, the casting is heavy, the material cost is high, the auxiliary material common molding sand or resin sand cost is increased, the production efficiency is low, and the labor cost is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an all-metal gravity casting process and a mold for medium-sized thin-wall box-type aluminum castings, which have high casting quality and low production cost and can be rapidly produced in batches.
The purpose of the invention is realized by the following technical scheme: the mold comprises an upper module, a lower module, a left module, a right module, a front module and a rear module which are detachably combined, wherein a mold cavity is formed by the six modules;
the lower module is plate-shaped, and the upper surface of the lower module is provided with a sliding chute for guiding the left module and the right module;
the left module and the right module are similar and respectively comprise a profile block A and a back plate A, the bottom surfaces of the profile block A and the back plate A are provided with mounting convex strips matched with the sliding grooves, and the profile block A and the back plate A are provided with corresponding positioning pin holes A along the front-back direction;
the front module and the rear module are similar and are provided with positioning pin holes B in a penetrating manner along the front-rear direction;
the upper die plate is provided with a mandril plate which can move up and down, and the mandril plate extends into the die cavity through the mandril.
The upper template further comprises a die frame bottom plate and a die bottom plate which are arranged up and down, the die frame bottom plate is fixedly connected with the die bottom plate through vertical blocks at two sides, and a positioning type block is arranged at the lower surface of the die bottom plate;
the ejector rod plate is positioned between the die frame bottom plate and the die bottom plate, and the ejector rod penetrates through the die bottom plate and the positioning type block.
Furthermore, the lower part of the positioning type block is an inner cavity forming part, and the inner cavity forming part is made of metal materials.
Furthermore, the circumferential side surface of the positioning type block is inclined inwards from top to bottom;
the left module, the right module, the front module and the rear module respectively comprise an inclined surface at the upper part and a molding surface at the lower part, the inclined surfaces of the left module, the right module, the front module and the rear module form a sprue upper section, and the inclined surfaces of the left module, the right module, the front module and the rear module are tightly matched after the mold is closed to form a mold-closed state to be poured.
Furthermore, a riser hole and an exhaust hole are formed in the positioning type block and the die bottom plate along the vertical direction; and a sprue groove is formed in the parting side surface of the rear module, and a sprue lower section, a slag collecting bag and an inner sprue are formed with the rear parting side surfaces of the left module and the right module after the mold is closed.
Preferably, the backboard a is arranged on the outer side face of the profile block a, the backboard a is wider than the profile block a and forms a right angle with the profile block a, and two edges of the inner side faces of the front module and the rear module are correspondingly matched with the right angle.
Furthermore, the front template and the rear template both comprise a model block B and a back plate B, and the back plate B is positioned on the outer side surface of the model block B.
Furthermore, T-shaped grooves are formed in the outer side surfaces of the back plate A and the back plate B, and the upper surface of the die carrier bottom plate is also provided with the T-shaped grooves.
The casting process comprises the following steps:
s1, preparing a die;
s11, analyzing the structure of the medium-sized thin-wall box-type aluminum casting, judging the conditions of shrinkage cavity, air hole, cold shut, hot crack, cold crack and top injection oxidation mold, designing the upper section of the sprue above the box wall of the medium-sized thin-wall box-type aluminum casting, and arranging the lower section of the sprue and the pouring position of the inner sprue at the lower part of the medium-sized thin-wall box-type aluminum casting; designing a dead head hole at the top surface of the medium-sized thin-wall box-shaped aluminum casting;
s12, designing and manufacturing a mold according to the structure of the medium-sized thin-wall box type aluminum casting, preparing a coating and cleaning the mold;
s2, casting;
s21, assembling the die on a metal type gravity casting machine;
s22, baking the die, and spraying paint on the forming surface of the die;
s23, starting the metal type gravity casting machine to close the mold, namely closing the left mold block and the right mold block, closing the front mold block and the rear mold block, and closing the mold blocks;
s24, pouring molten qualified aluminum alloy liquid;
and S25, cooling, solidifying and cooling the medium-sized thin-wall box-type aluminum casting, starting the metal gravity casting machine member to pull the mold, slightly pulling the front module and the rear module when the mold is pulled, slightly pulling the left module, the right module and the upper module in sequence, then opening the front module and the rear module to the limit positions, opening the left module and the right module to the limit positions, opening the upper module to the limit positions, and finally demolding the medium-sized thin-wall box-type aluminum casting.
Further, in the casting process, when the next medium-sized thin-wall box-shaped aluminum casting needs to be produced, the steps S22-S25 are repeated; and after production is finished, cooling the die to room temperature, disassembling the die, cleaning the die, folding and storing the die, and cleaning the metal type gravity casting machine.
The invention has the following advantages:
(1) according to the characteristics of the medium-sized thin-wall aluminum casting, an inner gate is designed at the casting wall at the bottom of the mold, so that the casting wall is full and free of defects; meanwhile, according to the flowing characteristic of the casting liquid, the casting liquid reaches the upper surface, so that a riser is arranged at the upper surface of the casting, the temperature field is adjusted, and the casting is fed, so that the casting defect is eliminated; and adopt the temperature equalization design scheme of the mould and temperature equalization measure of the casting head, thus guarantee the casting quality of the whole casting, compared with casting process of the traditional ordinary sand core or resin sand core, the inner defect of this scheme is few, the surface quality is high;
(2) in the scheme, the sand core auxiliary material is not adopted, so that the cost of the sand core can be avoided; after the casting is finished, because the sand core is not adopted, the casting is easy to clean, and the cost of a molding worker and a cleaning worker is reduced; the sand core modeling is omitted, a large amount of time required by cleaning is saved, and the production efficiency is greatly improved;
(3) the structure of mould, each module of being convenient for fast assembly is integrative, and the position reliability of each module is high, need not the adjustment.
Drawings
FIG. 1 is an exploded view of the mold of the present invention;
FIG. 2 is a view showing the construction of mold closure according to the present invention;
FIG. 3 is a block diagram of an upper module;
FIG. 4 is a block diagram of the left module;
FIG. 5 is a plan view of a riser and an exhaust groove of a medium-sized thin-wall box type aluminum casting process;
FIG. 6 is a perspective view of a medium-sized thin-walled box-shaped aluminum casting;
FIG. 7 is a schematic view of a gating system in a process for casting a medium thin wall box aluminum casting;
in the figure: in the figure: 1-upper module, 101-ejector rod plate, 102-ejector rod, 103-die carrier top plate, 104-die base plate, 105-side vertical block, 106-positioning block, 107-riser hole, 108-ejector hole, 109-inner cavity forming part, 2-lower module, 201-chute, 3-left module, 4-right module, 5-front module, 6-rear module, 701-die block A, 702-back plate A, 703-installation raised strip, 704-positioning pin hole A, 8-positioning pin hole B, 901-inclined surface, 902-forming surface, 903-sprue upper section, 904-sprue lower section, 905-slag collecting ladle, 906-inner sprue, 1001-die block B, 1002-back plate B and 11-T type groove.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
As shown in fig. 1 to 7, the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings comprises an upper mold block 1, a lower mold block 2, a left mold block 3, a right mold block 4, a front mold block 5 and a rear mold block 6 which are detachably combined, wherein the six mold blocks form a mold cavity, the six mold blocks are all installed on a metal gravity casting machine through a T-shaped groove 11 formed in the outer side surface of the mold block, and the metal gravity casting machine drives the corresponding mold block to be drawn.
In this embodiment, the mould, be fit for wall thickness 3~5mm, the volume: the X, the X and the X are not more than 350 and 450 mm, and the aluminum alloy box or shell casting is produced.
In the scheme, the lower module 2 is plate-shaped, and the upper surface of the lower module is provided with a chute 201 for guiding the left module 3 and the right module 4; the left module 3 and the right module 4 are similar, the bottom surfaces of the left module and the right module are provided with mounting convex strips 703, and the mounting convex strips 703 can slide in the sliding grooves 201; and both include type piece A701 and backplate A702, backplate A702 sets up in the lateral surface department of type piece A701, and backplate A702 is wider than type piece A701 width and both form the right angle, and preceding module 5 and back module 6's two edges of medial surface correspond with this right angle adaptation. The left module 3 and the right module 4 are provided with corresponding positioning pin holes A704 along the front-back direction, the front module 5 and the rear module 6 are provided with positioning pin holes B8 along the front-back direction in a penetrating manner, the positioning pin holes A704 correspond to the positioning pin holes B8 in position, and the positioning matching assembly of the left module 3, the right module 4, the front module 5 and the rear module 6 is realized through positioning pins.
As shown in fig. 3, the upper module 1 includes a mold base plate 103 and a mold base plate 104 which are arranged up and down, the mold base plate 103 is fixedly connected with the mold base plate 104 through two side vertical blocks 105, and a positioning block 106 is arranged on the lower surface of the mold base plate 104; a top rod plate 101 which can move up and down is arranged between the die frame bottom plate 103 and the die bottom plate 104, and the top rod plate 101 penetrates through the die bottom plate 104 and the positioning mould block 106 through a top rod 102 and extends into a die cavity.
In the scheme, the mold plate chassis 103 is provided with the ejection hole 108, the metal type gravity casting machine is provided with the ejection mechanism, and an ejection shaft of the ejection mechanism passes through the ejection hole 108 and then contacts with the ejector rod plate 101, so that the ejector rod plate 101 moves downwards to push the ejector rod 102 to realize the demolding ejection of the casting. The ejection system is reset through a reset ejector rod arranged on the ejector rod plate.
As shown in fig. 3, the lower portion of the positioning block 106 is a cavity forming portion 109, and the cavity forming portion 109 is made of a metal material.
In the scheme, the circumferential side surface of the positioning block 106 is inclined inwards from top to bottom; the left mold block 3, the right mold block 4, the front mold block 5 and the rear mold block 6 respectively comprise an inclined surface 901 at the upper part and a molding surface 902 at the lower part, the inclined surfaces 901 of the four mold blocks and the side surface of the positioning mold block 106 form a straight gate upper section 903, and the straight gate upper section 903 is tightly matched after the mold is closed to form a mold closed state to be poured. The upper part of the positioning block 106 is a positioning part which is matched with the front module 5, the rear module 6, the left module 3 and the right module 4 after being folded to determine the conformity of the height position of the upper module 2 and the wall thickness of a casting and form a sprue upper section 903, a riser and an exhaust groove; the lower portion is an internal cavity forming portion 109 that forms the inner surface of the casting. And a gate groove is formed in the parting side surface of the rear module 6, and a sprue lower section 904, a slag collecting bag 905 and an inner gate 906 are formed with the rear parting side surfaces of the left module 3 and the right module 4 after the mold is closed.
Furthermore, a riser hole 107 and an exhaust hole are formed in the positioning block 106 and the die base plate 104 along the vertical direction.
In the scheme, the front template 5 and the rear template 6 both comprise a model block B1001 and a back plate B1002, and the back plate B1002 is located on the outer side surface of the model block B1001. Wherein the blocks B1001 of the front and rear modules 5, 6 form the front and rear surfaces of the casting, both also forming the gating system, risers and venting grooves. The fitting of the modules is achieved by inserting a dowel pin into the corresponding dowel pin hole (not shown).
In the present embodiment, the minimum cross-sectional area ratio of the in-gate to the in-gate 906 is 1.4: 1.
In this embodiment, in order to obtain a smooth casting surface and to improve the service life of the mold, the shaped portion of each of the above modules, i.e., the block (shaped module), was formed by precision machining and electric discharge machining using hot-work die steel in a quenched state.
An all-metal gravity casting process for medium-sized thin-wall box-type aluminum castings comprises the following steps:
s1, preparing a die;
s11, analyzing the structure of the medium-sized thin-wall box-type aluminum casting, judging the conditions of shrinkage cavity, air hole, cold shut, hot crack, cold crack and top injection oxidation mold, designing the upper part 903 of the sprue at the upper part of the box wall of the medium-sized thin-wall box-type aluminum casting, and arranging the pouring positions of the lower part 904 and the inner sprue 906 of the sprue at the lower part of the medium-sized thin-wall box-type aluminum casting; designing a dead head hole 107 at the top surface of the medium-sized thin-walled box aluminum casting;
s12, designing and manufacturing a mold according to the structure of the medium-sized thin-wall box type aluminum casting, preparing a coating and cleaning the mold; when the coating is prepared, 50g of zinc oxide, 100g of chalk powder, 70-90 g of water glass with the relative density of gamma 1.3-1.5 and 1000g of pure water are uniformly mixed and sprayed on the surface of a cavity; for a pouring system, a coating with low water content is used, and water is added according to the condition of coating hanging, wherein the weight of the water is generally about 700 g;
s2, casting;
s21, assembling the die on a metal type gravity casting machine;
s22, baking the die, and spraying paint on the forming surface of the die;
s23, starting the metal type gravity casting machine to close the mold, namely closing the left mold block 3 and the right mold block 4, closing the front mold block 5 and the rear mold block 6, and closing the mold block 1;
s24, pouring molten qualified aluminum alloy liquid, wherein the casting temperature is 700-740 ℃, and the temperature of the mold is 280-340 ℃;
and S25, cooling, solidifying and cooling the medium-sized thin-wall box-type aluminum casting, starting a metal gravity casting machine to pull the mold open, slightly pulling the front module 5 and the rear module 6 open, slightly pulling the left module 3, the right module 4 and the upper module 1 in sequence, opening the front module 5 and the rear module 6 to the limit positions, opening the left module 3 and the right module 4 to the limit positions, opening the upper module 1 to the limit positions, and finally demolding the medium-sized thin-wall box-type aluminum casting.
Further, in the casting process, when the next medium-sized thin-wall box-shaped aluminum casting needs to be produced, the steps S22-S25 are repeated; and after production is finished, cooling the die to room temperature, disassembling the die, cleaning the die, folding and storing the die, and cleaning the metal type gravity casting machine.
Claims (10)
1. A full metal type gravity casting process and mould for medium-sized thin wall box type aluminum casting, its characterized in that:
the die comprises an upper die block (1), a lower die block (2), a left die block (3), a right die block (4), a front die block (5) and a rear die block (6) which are detachably combined, and the six die blocks form a die cavity;
the lower module (2) is plate-shaped, and the upper surface of the lower module is provided with a sliding groove (201) for guiding the left module (3) and the right module (4);
the left module (3) and the right module (4) are similar and respectively comprise a profile block A (701) and a back plate A (702), the bottom surfaces of the profile block A and the back plate A are provided with mounting convex strips (703) matched with the sliding groove (201), and the profile block A and the back plate A are provided with corresponding positioning pin holes A (704) along the front-back direction;
the front module (5) and the rear module (6) are similar and are provided with positioning pin holes B (8) in a penetrating manner along the front-rear direction;
the upper template (1) is provided with a push rod plate (101) capable of moving up and down, and the push rod plate (101) extends into the cavity of the template through a push rod (102).
2. The all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings according to claim 1, wherein the all-metal gravity casting process and the all-metal gravity casting mold are characterized in that: the upper template (1) further comprises a mold base plate (103) and a mold base plate (104) which are arranged up and down, the mold base plate (103) is fixedly connected with the mold base plate (104) through vertical blocks (105) on two sides, and a positioning block (106) is arranged on the lower surface of the mold base plate (104);
the ejector rod plate (101) is located between the die frame bottom plate (103) and the die bottom plate (104), and the ejector rod (102) penetrates through the die bottom plate (104) and the positioning type block (106).
3. The all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings according to claim 2, wherein the all-metal gravity casting process and the all-metal gravity casting mold are characterized in that: the lower part of the positioning type block (106) is an inner cavity forming part (109), and the inner cavity forming part (109) is made of metal materials.
4. The all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings according to claim 3, wherein the all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings are characterized in that: the circumferential side surface of the positioning block (106) is inclined inwards from top to bottom;
the left die block (3), the right die block (4), the front die block (5) and the rear die block (6) respectively comprise an upper inclined surface (901) and a lower molding surface (902), and the inclined surfaces (901) and the side surfaces of the positioning die block (106) form a sprue upper section (903).
5. The all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings according to claim 4, wherein the all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings are characterized in that: a riser hole (107) and an exhaust hole are formed in the positioning block (106) and the die bottom plate (104) along the vertical direction;
and a gate groove is formed in the parting side surface of the rear module (6), and a sprue lower section (904), a slag collecting bag (905) and an inner gate (906) are formed with the parting side surfaces of the left module (3) and the right module (4) after the mold is closed.
6. The all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings according to claim 5, wherein the all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings are characterized in that: the backboard A (702) is arranged on the outer side face of the model block A (701), the backboard A (702) is wider than the model block A (701) in width and forms a right angle with the model block A (701), and two edges of the inner side faces of the front module (5) and the rear module (6) are correspondingly matched with the right angle.
7. The all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings according to claim 6, wherein the all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings are characterized in that: the front template (5) and the rear template (6) both comprise a model block B (1001) and a back plate B (1002), and the back plate B (1002) is positioned on the outer side surface of the model block B (1001).
8. The all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings according to any one of claims 1 to 7, wherein the all-metal gravity casting process and the all-metal gravity casting mold are characterized in that: and T-shaped grooves (11) are formed in the outer side surfaces of the back plate A (702) and the back plate B (1002), and the upper surface of the die carrier bottom plate (103) is also provided with the T-shaped grooves (11).
9. The all-metal gravity casting process and mold for medium thin wall box aluminum castings according to claim 8, wherein: the casting process comprises the following steps:
s1, preparing a die;
s11, analyzing the structure of the medium-sized thin-wall box-type aluminum casting, judging the conditions of shrinkage cavity, air hole, cold shut, hot crack, cold crack and top injection oxidation mold, designing the upper part (903) of the sprue at the upper part of the box wall of the medium-sized thin-wall box-type aluminum casting, and arranging the pouring positions of the lower part (904) and the inner sprue (906) of the sprue at the lower part of the medium-sized thin-wall box-type aluminum casting; designing a riser hole (107) at the top surface of the medium-sized thin-wall box-type aluminum casting;
s12, designing and manufacturing a mold according to the structure of the medium-sized thin-wall box type aluminum casting, preparing a coating and cleaning the mold;
s2, casting;
s21, assembling the die on a metal type gravity casting machine;
s22, baking the die, and spraying paint on the forming surface of the die;
s23, starting the metal type gravity casting machine to close the mold, namely closing the left mold block (3) and the right mold block (4), closing the front mold block (5) and the rear mold block (6) and closing the mold block (1);
s24, pouring molten qualified aluminum alloy liquid;
s25, cooling, solidifying and cooling the medium-sized thin-wall box-type aluminum casting, starting a metal gravity casting machine to pull the mold open, slightly pulling the front module (5) and the rear module (6) when the mold is pulled open, slightly pulling the left module (3), the right module (4) and the upper module (1) in sequence, then opening the front module (5) and the rear module (6) to the limit positions, opening the left module (3) and the right module (4) to the limit positions, opening the module (1) to the limit positions, and finally demolding the medium-sized thin-wall box-type aluminum casting.
10. The all-metal gravity casting process and the all-metal gravity casting mold for the medium-sized thin-wall box-type aluminum castings according to claim 9, wherein: in the casting process, when the next medium-sized thin-wall box-shaped aluminum casting needs to be produced, the steps S22-S25 are repeated;
and after production is finished, cooling the die to room temperature, disassembling the die, cleaning the die, folding and storing the die, and cleaning the metal type gravity casting machine.
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