CN101190454A - Method for using metal type sand-covering technique to manufacture brake drum - Google Patents
Method for using metal type sand-covering technique to manufacture brake drum Download PDFInfo
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- CN101190454A CN101190454A CNA2006101441191A CN200610144119A CN101190454A CN 101190454 A CN101190454 A CN 101190454A CN A2006101441191 A CNA2006101441191 A CN A2006101441191A CN 200610144119 A CN200610144119 A CN 200610144119A CN 101190454 A CN101190454 A CN 101190454A
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 239000002184 metal Substances 0.000 title claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 244000035744 Hura crepitans Species 0.000 claims abstract description 93
- 239000004576 sand Substances 0.000 claims abstract description 58
- 238000005266 casting Methods 0.000 claims abstract description 12
- 238000005507 spraying Methods 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 13
- 238000001816 cooling Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005087 graphitization Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 208000034189 Sclerosis Diseases 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 108010038629 Molybdoferredoxin Proteins 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 239000007767 bonding agent Substances 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
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- 230000000994 depressogenic effect Effects 0.000 description 1
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- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The invention relates to a method of manufacturing a brake drum by utilizing a metal-typed sand covering technique, comprising a die joint is determined by the maximum diameter position of the brake drum, a lower joint is determined by a large mouth part and an upper joint is determined by a small mouth part; an internal model and an external model are respectively arranged in order to ensure the internal profile dimension and the external profile dimension of the brake drum; an internal sand box and an external sand box are respectively arranged in order to manufacture the lower joint and the upper joint of the brake drum; after the internal model and the internal sand box, the external model and the external sand box are assembled according to prearranged clearances, the internal sand box and the external sand box are covered with sands through a sand injection hole; metal liquid is poured after the internal sand box and the external sand box with sand cover are tightly locked. The invention has the advantages of improving working environment, more precise dimension of the castings, better surface quality, higher yield, lower cost and higher production efficiency.
Description
Technical field
The present invention relates to a kind of manufacture method of vehicle brake drum, particularly relate to a kind of method of utilizing metal type sand-covering technique to manufacture brake drum.
Background technology
Brake drum is widely used in automobile industry.The production technology of traditional brake drum mainly adopts: tide mould sand hand moulding or tide mould sand machine molding.
For the tide mould sand hand moulding, on the one hand, owing in playing mold process, want the first vibration shape, manually firmly be inconsistent in a circumferential direction, so die cavity is not round after the molding, promptly Cao Zuo man's activity is bigger, cause foundry goods mistake circle serious owing to making die cavity itself lose circle in the modeling process easily, surface quality is poor, thereby causes the casting quality poor stability, the percent defective height; On the other hand, the production efficiency of employing hand moulding is low, sand using amount is big.
For the tide mould sand machine molding, though production efficiency has improved, exist sand using amount big too, problems such as surface quality of continuous castings difference.And, in tide mould sand machine molding process, because middle (type space in the brake drum) is a very big big core, can make the core distortion in handling behind the type of rising or the mould turnover process, thereby make die cavity not round, therefore, not only can cause to carry big core operating difficulties, and foundry goods mistake circle problem is not resolved yet.
And, for the tide mould sand moulding needs, promptly guarantee the intensity of molding sand and prevent foundry goods scab that all can add a certain amount of bentonite and coal dust usually in tide mould sand, this makes workman's working environment also become relatively poor accordingly.
In addition, because the brake drum foundry goods adopts the gray iron material mostly, the foundry goods higher for requirement of strength just needs to add alloy, waits and guarantees the desired performance of foundry goods as adding copper, ferrochrome, molybdenum-iron.And on the other hand, because adopting the die cavity of tide mould sand moulding is that green-sand forms, hardness and intensity are all lower, the expansive force of the graphitization expansion of cast back iron liquid in process of setting can make die cavity increase, therefore foundry goods just needs outside bigger riser feeding to satisfy, promptly need to replenish alloy, realize iron liquid from feeding.Therefore, the tide mould sand moulding also needs to add alloy, causes cost to rise.
At present, in the machine casting field, also adopt metal type sand-covering technique to come casting.But, this metal type sand-covering technique has only only a few producer to adopt, and major part only is used for spherulitic iron crankshaft, be applied to make brake drum seldom, it mainly is because the manufacturing object difference, and make that the design difficulty of model, sandbox is bigger, especially how reasonably determine die joint and make that the location of sandbox and model and sandbox and sandbox is more convenient, and help covering delivery behind the sand, problem such as delivery difficulty after promptly existing metal type sand-covering technique is applied to have in the brake drum location inconvenience and covers sand.And, because the difference of manufacturing object, use metal type sand-covering technique to manufacture brake drum also to have following problem: first, how to design the structure of metal pattern, sandbox, make it can satisfy requirement of strength and can satisfy the cooling requirement again, the promptly too thin requirement of not satisfying intensity, too thick then cooling capacity is too strong, foundry goods easily produce cementite make organize defective; The second, cover the thickness of layer of sand, the how thick layer of sand that covers could both satisfy and covered sand easily and guarantee to cover the integrality on sand surface, thereby guaranteed the surface quality of foundry goods, satisfied cooling simultaneously again and required and reduce problems such as sand using amount.As mentioned above, these all are to adopt the difficulty that exists in the metal type sand-covering technique to manufacture brake drum process, need to solve.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of utilizing metal type sand-covering technique to manufacture brake drum, overcome that the foundry goods that tradition adopts the green sand moulding technique to manufacture brake drum to be brought loses circle, surface quality is poor, yield rate is low, cost is higher and problem such as poor working environment, and overcome that existing metal type sand-covering technique is applied in the brake drum manufacturing and the die joint that produces is determined to be difficult for, the location inconvenience of sandbox and model and sandbox and sandbox and cover sand after problems such as delivery difficulty.
To achieve these goals, the invention provides a kind of method of utilizing metal type sand-covering technique to manufacture brake drum, its characteristics are that this method comprises
Determine die joint with this drum diameter maximum, and be defined as mo(u)ld bottom half, be defined as mo(u)ld top half with little notch portion with big notch portion;
Interior profile and outer profile size that inside and outside model is used to guarantee described brake drum are set respectively;
Mo(u)ld bottom half and mo(u)ld top half that inside and outside sandbox is used to make this brake drum are set respectively;
Assemble this inner model and interior sandbox with predetermined gap respectively, and after external model and the outer sandbox, on this inside and outside sandbox, cover sand by sand-spraying hole;
Lock this and have casting of molten metal behind the inside and outside sandbox that covers layer of sand.
Above-mentioned method, its characteristics are that this predetermined gap is 4～15mm.
Above-mentioned method, its characteristics are that the thickness of this inner model and external model is 10～20mm.
Above-mentioned method, its characteristics are that thickness of sandbox and outer sandbox is 10～20mm in this.
Above-mentioned method, its characteristics are that this method also comprises the delivery of unpacking after layer of sand hardens that covers of waiting for inside and outside sandbox.
Above-mentioned method, its characteristics be, this method is also included, spray releasing agent on the working face of external model.
Above-mentioned method, its characteristics are that this method also is included in this predetermined gap and puts into binding agent.
Above-mentioned method, its characteristics are that this sand-spraying hole is 10～30.
Above-mentioned method, its characteristics are that the diameter of this sand-spraying hole is Φ 10～Φ 15mm.
Above-mentioned method, its characteristics are that this thickness that covers layer of sand is 4～15mm.
According to an aspect of the present invention, make brake drum by adopting metal type sand-covering technique, compare with traditional brake drum manufacturing technology, the present invention has the following advantages:
1, auxiliary equipment and operation reduce;
2, sand using amount reduces, simultaneously since in the sand without bentonite and coal dust, the pollution of environment is reduced, improved workman's working condition greatly;
3, owing to adopt and to cover sand and produce whole modeling process and can not make mold cavity deformation, thereby guaranteed to cover the accuracy of die cavity circularity behind the sand, and then the foundry goods that has solved traditional tide mould sand moulding loses circle problem;
4, casting dimension is accurate, and surface quality improves greatly, the yield rate height, and follow-up cleaning amount is little;
5, adopt metal type sand-covering, because cast back cooling velocity of casting is fast, chemical composition of the same race can make that casting strength improves greatly, just compares with tide mould sand and can add or not add alloy less so will reach a certain performance;
6, reduce cost, shorten the production cycle time, the production efficiency height;
7, because brake drum covers the sand layer thickness that covers that has only 4～15mm between the metal flask of sand and the die cavity, and the very thin sand of this layer hardens after moulding, hardness is also high especially, so the power of the graphitization expansion in pouring metal melt after coagulation process can not make die cavity move, graphitization expansion Ben Shen has also just realized not having deformability from feeding thereby have foundry goods like this, need not feeding head, product yield height, and foundry goods dense structure.
According to a further aspect in the invention, compare with existing metal type sand-covering technique, the present invention is applied to make metal type sand-covering technique on the brake drum, structural design by rational die joint and metal pattern, sandbox, make that the location of sandbox and model and sandbox and sandbox is more convenient, and help covering delivery behind the sand, and the casting dimension that manufacturing is come out is accurate, surface quality height, yield rate height.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 adopts the flow chart of the method for metal type sand-covering technique to manufacture brake drum for the present invention;
Fig. 2 is the schematic diagram of brake drum of the present invention, and wherein the diameter maximum with this brake drum is a die joint, and big notch portion is defined as mo(u)ld bottom half, and little notch portion is defined as mo(u)ld top half;
Fig. 3 A is used to make the perspective view of the external model of mo(u)ld top half for the present invention, and wherein the working face of this external model (outline) guarantees the uniformity with the brake drum outline, for example size;
Fig. 3 B is the cutaway view of Fig. 3 A, and wherein the thickness of this external model is preferably 10～20mm;
Fig. 4 A wherein should outer sandbox inner cavity surface imitate the brake drum profile for the perspective view that the present invention is used to make the outer sandbox of mo(u)ld top half;
Fig. 4 B is the bottom view of Fig. 4 A, and wherein the bottom is distributed with 10～30 sand-spraying holes;
Fig. 4 C is the side view of Fig. 4 A, and the thickness that wherein is somebody's turn to do outer sandbox is 10～20mm;
Fig. 5 utilizes the structural representation of external model and outer sandbox making mo(u)ld top half for the present invention, and wherein the sand layer thickness that covers on the sandbox surface of internal cavity is 4～15mm outside;
Fig. 6 A is the perspective view of inner model of the present invention, wherein the uniformity of profile, for example size in the working face of this inner model (interior profile) assurance and the brake drum;
Fig. 6 B is the polycrystalline substance schematic diagram of Fig. 6 A;
Fig. 6 C is the cutaway view of Fig. 6 A, and wherein the thickness of this inner model is preferably 10～20mm;
Fig. 7 A is used to make the perspective view of the interior sandbox of mo(u)ld bottom half for the present invention, wherein should in shape in the imitative brake drum of sandbox outer surface;
Fig. 7 B is the bottom view of Fig. 7 A, and wherein there is an inner fovea part in bottom centre;
Fig. 7 C is the side view of Fig. 7 A, and the thickness of sandbox is 10～20mm in wherein being somebody's turn to do;
Fig. 8 makes the structural representation of mo(u)ld bottom half for the present invention utilizes inner model and interior sandbox, and wherein the sand layer thickness that covers on interior sandbox outer surface is 4～15mm;
Fig. 9 utilizes mo(u)ld top half and mo(u)ld bottom half cast to make the structural representation of brake drum.
The specific embodiment
As shown in Figure 1, the present invention adopts the method for metal type sand-covering technique making brake drum to comprise:
Describe mould and the method thereof that the present invention makes brake drum in detail below in conjunction with Fig. 3～9.
As shown in Figure 3A, external model 20 of the present invention comprises an external model body 21, and the working face of this external model 20 (outer contour surface 211 of body 21) guarantees the uniformity with brake drum outline 11 (as shown in Figure 2), for example size.Evagination has a lug boss 22 near 24 centers, model ontology 21 bottoms outside.
Preferable, shown in Fig. 3 B, this external model openend periphery extension is provided with one first flange 23, and this outside, first flange, 23 backs forms a first step 231.And preferable, the thickness L1 of this external model can be 10～20mm, and this thickness can not only satisfy the requirement of strength of foundry goods, and can satisfy the cooling requirement of technology.
Shown in Fig. 4 A, and in conjunction with Fig. 4 B, 4C, outer sandbox 30 of the present invention comprises an outer sandbox body 31, and is somebody's turn to do the imitative brake drum profile of working face (inner cavity surface 312 of body 31) of outer sandbox 30.Should have one first perforate 341 near 34 centers, bottom of outer sandbox 30, its diameter is a bit larger tham the lug boss 22 of these external model 20 bottoms.And, this bottom 34 also is provided with first sand-spraying hole 343 that 10～30 diameters are 10～15mm, these first sand-spraying holes 343 are near the outer circumferential position setting of bottom 34, so that these first sand-spraying holes 343 are close to the be assembled together position of the neighboring predetermined gap that forms between the latter two of external model 20 and outer sandbox 30 substantially, be convenient to penetrate sand.And, near should outside on outer sandbox body 31 outer surfaces of sandbox 30 openends 23, be provided with first of four symmetrical distributions and lift case portion 32, this first is lifted case portion 32 and is formed with and is convenient to lift first of case and lifts case hole 321.Preferable, the place, openend 33 inside edges of this outer sandbox 30 is formed with second step 331, closely cooperates when external model 20 assembles with outer sandbox 30 being used for.The thickness L2 that is somebody's turn to do outer sandbox can be 10～20mm.
As shown in Figure 5, show the structure that the present invention utilizes external model 20 and outer sandbox 30 to make mo(u)ld top half.When making mo(u)ld top half, at first place external model 20; Then (for example with predetermined gap, 4～15mm) are assembled together outer sandbox 30 and external model 20, wherein, the lug boss 22 of these external model 20 bottoms just places in first perforate 341 of outer sandbox 30 bottoms 34, form a gap 342 between the two, and should outer sandbox 30 openends 33 inside edges the second step 331 at place be assemblied in just on the first step 231 at first flange, 23 backs of external model 20 openends, so, this external model 20 gets final product close fit together with outer sandbox 30; Utilize core shooter to penetrate sand at last by first sand-spraying hole 341 and gap 342 on outer sandbox 30 bottoms, waiting to cover sand sclerosis back unpacks, formation has the certain thickness layer of sand 36 that covers on then outer sandbox 30 surface of internal cavity, and the preferable 4～15mm that can be of its thickness is to guarantee the cooling velocity at each position of foundry goods.So far, this mo(u)ld top half completes.
As shown in Figure 6A, inner model 40 of the present invention comprises an inner model body 41, and the working face of this inner model body 41 (interior contour surface 412) guarantees the uniformity with the interior profile 12 (as shown in Figure 2) of brake drum, for example size.
Shown in Fig. 6 B, 6C, intracavity bottom 44 indents of this inner model 40 form a circular depression 445, and further penetrate these inner model 40 bottoms near the center of this depressed part 445 and form second perforate 441.These inner model 40 bottoms 44 are symmetrically arranged with four installing holes 443 near the excircle place, are used for inner model 40 fixing to penetrating on the sand machine.And, be provided with one second flange 43 in this inner model 40 openend peripheries extension, these second flange, 43 facial close inner chamber one sides form second variant part 431, first variant part 121 (as shown in Figure 2) basically identical with profile 12 close open end in this brake drum 10, then form one first department of assembly 432 near the outside, as be a groove.
Shown in Fig. 7 A, and in conjunction with Fig. 7 B, 7C, sandbox 50 comprises sandbox body 51 in this, and the working face (outer surface 511 of body 51) of sandbox 50 is imitated shape in the brake drum in being somebody's turn to do.The bottom 54 outer surface part evaginations of sandbox 50 form a circular protrusions 540 in being somebody's turn to do, and should near partly the caving inward in projection 540 centers form one first depression 542, part further forms one second depression 543 to the chamber sunken inside near these first depression, 542 centers, and this second depression 543 roughly caves in into hemisphere face and protrudes in sandbox 50 inner chamber bottom surfaces 544 in this slightly.Should interior sandbox 50 openend peripheries extension be provided with the 3rd flange 53, the 3rd flange 53 backs are recessed to form first annular groove 531 near body 51 outer surfaces 511 places, these first annular groove, 531 outer sides further are recessed to form second annular groove 532, thereby form one the 3rd step 533.It is 10～15mm, second sand-spraying hole 55 that the 3rd step 533 is provided with 10～30 diameters.And, near should on outer sandbox body 51 outer surfaces of sandbox 50 openends, also be provided with second of four symmetrical distributions and lift case portion 52, this second is lifted case portion 52 and is formed with and is convenient to lift second of case and lifts case hole 521.The thickness L2 that is somebody's turn to do outer sandbox can be 10～20mm.
As shown in Figure 8, show the structure that the present invention utilizes inner model 40 and interior sandbox 50 to make mo(u)ld bottom half.When making mo(u)ld bottom half, at first, place inner model 40; Then, place a running gate system 61 on inner model 40 inner chamber bottom surfaces 544, these running gate system 61 surfaces form a projection 613; Then, with predetermined gap (for example, 4～15mm) are assembled together interior sandbox 50 and inner model 40, wherein, second depression, 543 correspondences of these inner model 40 bottoms, and the 3rd flange 53 outsides of sandbox 50 also are assemblied in first department of assembly 432 of these inner model 40 second flanges 43 just in being somebody's turn to do, and so inner model 40 can be realized close fit with interior sandbox 50, and form this predetermined gap between the two; Utilize core shooter to penetrate sand by second sand-spraying hole 55 on the interior sandbox 50 at last, wait to cover sand sclerosis back and unpack, formation has the certain thickness layer of sand 56 that covers on then interior sandbox 50 outer surfaces, and the preferable 4～15mm that can be of its thickness is to guarantee the cooling velocity at each position of foundry goods.So far, this mo(u)ld bottom half completes.
Preferable, by also can finding out among Fig. 8, these second sand-spraying hole, 55 positions are close to the be assembled together position of the neighboring predetermined gap that forms between the latter two of inner model 40 and interior sandbox 50 substantially, are convenient to penetrate sand.
As shown in Figure 9, show the structure of utilizing the upper and lower type making brake drum that completes.When making brake drum, at first, placement has the interior sandbox 50 (being mo(u)ld bottom half) that covers layer of sand 56; Then, on interior sandbox 50, place and have the outer sandbox 30 (being mo(u)ld top half) that covers layer of sand 36, and it is tight with the case kayser this mo(u)ld top half, mo(u)ld bottom half, form a predetermined space between the two, this predetermined space and the brake drum shape, the consistent size that need to make, and as pouring into a mould passage for cast formation brake drum, these cast passages comprise the perpendicular row of channels 803 of walking crosswise formation between passage 802 and outer sandbox 30 bodies 31 and interior sandbox 50 bodies 51 that outer sandbox 30 bottoms and interior sandbox 50 bottoms form; Cup 71 is put in sandbox 30 upper ends outside this then, this cup 71 has a sprue 801, this sprue 801 is walked crosswise passage 802 with this, perpendicular row of channels 803 is communicated with, and also has a venthole 73 on the cup 71, and this venthole 73 is communicated to this interconnection 802 tops; Then, casting of molten metal; At last, unpack, obtain foundry goods.
In the present invention, for the ease of delivery, when making upper and lower type, can be outside, spray releasing agent on the working face of inner model; When making foundry goods, can on the working face of inside and outside sandbox, spray releasing agent equally.
In the present invention, the composition that covers sand can comprise bonding agent (resin), curing agent and additive etc., thereby makes that to cover layer of sand tightr, and it is faster to harden.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and modification according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. utilize the method for metal type sand-covering technique to manufacture brake drum, it is characterized in that, this method comprises
Determine die joint with this drum diameter maximum, and be defined as mo(u)ld bottom half, be defined as mo(u)ld top half with little notch portion with big notch portion;
Interior profile and outer profile size that inside and outside model is used to guarantee described brake drum are set respectively;
Mo(u)ld bottom half and mo(u)ld top half that inside and outside sandbox is used to make this brake drum are set respectively;
Assemble this inner model and interior sandbox with predetermined gap respectively, and after external model and the outer sandbox, on this inside and outside sandbox, cover sand by sand-spraying hole;
Lock this and have casting of molten metal behind the inside and outside sandbox that covers layer of sand.
2. method according to claim 1 is characterized in that, this predetermined gap is 4～15mm.
3. method according to claim 2 is characterized in that, the thickness of this inner model and external model is 10～20mm.
4. method according to claim 3 is characterized in that, thickness of sandbox and outer sandbox is 10～20mm in this.
5. method according to claim 4 is characterized in that, this method also comprises the delivery of unpacking after layer of sand hardens that covers of waiting for inside and outside sandbox.
6. method according to claim 1 is characterized in that, this method is also included, spray releasing agent on the working face of external model.
7. method according to claim 1 is characterized in that, this method also is included in this predetermined gap and puts into binding agent.
8. method according to claim 1 is characterized in that, this sand-spraying hole is 10～30.
9. method according to claim 8 is characterized in that, the diameter of this sand-spraying hole is Φ 10～Φ 15mm.
10. method according to claim 1 is characterized in that, this thickness that covers layer of sand is 4～15mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101441191A CN100571927C (en) | 2006-11-27 | 2006-11-27 | Utilize the method for metal type sand-covering technique to manufacture brake drum |
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| CNB2006101441191A CN100571927C (en) | 2006-11-27 | 2006-11-27 | Utilize the method for metal type sand-covering technique to manufacture brake drum |
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| CN101190454A true CN101190454A (en) | 2008-06-04 |
| CN100571927C CN100571927C (en) | 2009-12-23 |
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