CN108907090A - A kind of casting technique of potassium steel creeper tread - Google Patents
A kind of casting technique of potassium steel creeper tread Download PDFInfo
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- CN108907090A CN108907090A CN201810960224.5A CN201810960224A CN108907090A CN 108907090 A CN108907090 A CN 108907090A CN 201810960224 A CN201810960224 A CN 201810960224A CN 108907090 A CN108907090 A CN 108907090A
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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
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The present invention relates to a kind of casting techniques of potassium steel creeper tread.Specific step is as follows for the casting technique：The first step determines manufacture mold；Second step manufactures sand mold, lower core mould assembling；Third step smelts steel scrap, prepares pour steel；1) Alloying Element Vanadium is added before smelting and titanium does raw core agent；2) white slag is continuously made during the smelting reducing phase, and controlling phosphorus content should be below 0.035%；4th step, casting；The tapping temperature 1590-1620 degree of pour steel, and it is primary to be poured preamble packet, makes pouring temperature at 1415~1435 degree；5th step is unpacked, and is unpacked after 50 minutes after casting.Present invention reduces potassium steel casting creeper tread cracking breakout and fracture probabilities, significantly improve service life.
Description
Technical field
The invention belongs to armored vehicle creeper tread processing technique fields, and in particular to a kind of founder of potassium steel creeper tread
Skill.
Background technique
It is ground force of China crawler type series tank behavioral system key components and parts that potassium steel, which casts creeper tread,.Existing potassium steel
Creeper tread generallys use casting, and China's potassium steel casts creeper tread and different degrees of break occurs in different group commissioning process
Split problem.By taking thousand kilometers of C group tests in 2007 as an example, after 1000 kilometers of driving, the cracking breakout of creeper tread is 29.4%, and 1500 is public
In after, the cracking breakout of creeper tread is 90.7%, and after 2000 kilometers, the cracking breakout of creeper tread is up to 99.5%, is unable to reach crawler belt
The life requirements that 3000 kilometers of plate.Crackle is concentrated mainly on left and right linking arm, intermediate pin ear two sides reinforcing rib, induction root portion four
In week, linking arm cracking breakout is 41% or more after 2000 kilometers of test runs, from 1500 kilometers to 2000 after kilometer test run from reinforcing rib
Crackle is extended rapidly by blind crack, increased, extended.Since consistent, creeper tread breakage problem does not solve thoroughly yet.For over the years
The tank crawler plates cracking breakout come is high, or even breakage problem frequent occurrence, especially when even by mutation stress
When hair factor, bear bigger extruding, bending stress, be easy to cause failure to generate fatigue rupture therewith, it is cracked even
Fracture influences the service life of creeper tread and the normally travel of vehicle, and then influences tactical qualities.Therefore must have good
Service performance and durability, to meet the equipment requirement under its extremity.
Summary of the invention
The purpose of the present invention is to propose to a kind of casting techniques of potassium steel creeper tread, reduce potassium steel casting creeper tread and split
Line rate and fracture probability, significantly improve service life.
The technical scheme is that specific step is as follows for a kind of casting technique of potassium steel creeper tread：
The first step determines manufacture mold；
Second step manufactures sand mold, lower core mould assembling；Using above-mentioned mold, sand mold is manufactured using static press moulding technique；In upper sand
The top of the quadrangle and type core of type and lower sand mold increases exhaust stick, and lower core uses coated sand technology, and precoated sand uses natural quartz
Sand is roughing sand；
Third step smelts steel scrap, prepares pour steel；
1) Alloying Element Vanadium is added before smelting and titanium does raw core agent；First by the vanadium broken into pieces, titanium alloy particle, and will strike
Broken vanadium and titanium alloy particle is placed in advance in steel ladle, with molten steel stream impulsive motion；
2) white slag is continuously made during the smelting reducing phase, and controlling phosphorus content should be below 0.035%；
4th step, casting；The tapping temperature 1590-1620 degree of pour steel, and it is primary to be poured preamble packet, makes casting temperature
Degree is at 1415~1435 degree；
1) the placing ceramic filter screen at cross gate two, the round hole uniformity of foam ceramic filter；
2) former cylindrical riser is improved to side shape riser consistent with linking arm end surface shape, and increasing volume；
It 3) is 4 casees by the pouring box number of every small pouring ladle, the duration of pouring is 6s~11s；
5th step is unpacked, and is unpacked after 50 minutes after casting.
Mold in the first step meets following requirements,
(1) it does flat at the coupled spud of creeper tread linking arm, strengthens linking arm intensity；
(2) the pin ear Rib Thickness that creeper tread linking arm and plate body inside are connected is 10mm~11mm；
(3) landing for creeper tread linking arm spud raises upwardly 2mm；
(4) creeper tread linking arm tilts 7mm~8mm upwards since 1/3 length；
(5) driving pin ear arc surface height increases 1mm~1.5mm, and carries out the wing and connect with semicircle transition outside driving pin ear；
(6) one reinforcing rib of engaging pin ear position setting, as double reinforcing rib structures；
(7) between linking arm and engaging pin ear, torque arm wall thickness is 14mm for torque arm；
(8) induction tooth height is 110mm.
In second step, it is 50~140 mesh that roughing sand, which selects granularity, and air penetrability is 100~140.
The invention has the advantages that the present invention is improved by using cast structure, casting technique is promoted, steel quality is excellent
Change improves ground force's caterpillar tank potassium steel casting creeper tread reliability, obtains preferable economic benefit；Promote ground force of China
Potassium steel casts creeper tread quality level, improves automobile reliability, and the present invention is nibbled in processability of product structure using linking arm-
Dowel pin ear-spud " three-in-one integrated ", control potassium steel cast creeper tread crackle, improve reliability；The present invention is using high-strength
Degree, extremely low gas forming amount precoated sand core moulding, linking arm " gradient method " thermal center, control potassium steel cast the effective of creeper tread crackle
Measure；The present invention takes addition microalloy element, and reduction period continuously makes white slag, reduces non-metallic inclusion and harmful element phosphorus contains
" the three's complementary method " of amount avoids potassium steel casting creeper tread from cracking tendency；Crawler belt is cast using potassium steel of the invention
Plate crack controlling means efficiently solve thousand kilometers of driving cracking breakouts of every crawler belt no more than 25%, and potassium steel casts crawler belt
Plate 3000km sport car is without breakage problem.
Specific embodiment
Specific step is as follows for a kind of casting technique of potassium steel creeper tread of the present invention：
The first step determines manufacture mold.
Mold meets following requirements,
(1) it does flat at the coupled spud of creeper tread linking arm, strengthens linking arm intensity；
(2) the pin ear Rib Thickness that creeper tread linking arm and plate body inside are connected is 10mm~11mm, is reinforced strong herein
Degree and reliability；
(3) landing for creeper tread linking arm spud raises upwardly 2mm, directly lands to reduce linking arm, moment
Bear the probability of alternating load；
(4) creeper tread linking arm inclination 7mm~8mm upwards since 1/3 length, makes at 1/3 length bearing distribution more
Rationally；
(5) driving pin ear arc surface height increases 1mm~1.5mm, and carries out the wing and connect with semicircle transition outside driving pin ear,
Driving wheel gear ring tooth tip repeated action is set to improve fatigue strength herein in driving pin ear inner sidewall；
(6) engaging pin ear is driving wheel gear teeth meshing position, and directly receiving active wheel drive force and speed variation generate
Impact force.For the structural strength for increasing the position, engaging pin ear adds a reinforcing rib in position, i.e. side single reinforcement structure optimization is
Double reinforcing rib structures structural strength and are connected with each other reliability at lift pin ear；
(7) torque arm bears driving wheel gear teeth pulling force between linking arm and engaging pin ear, and relative load is larger.Torque arm wall
Thickness increases to 14mm by original 12mm, increases torque arm tensile strength；
(8) in order to further enhance the durability of creeper tread and reliability, whole reinforcement is carried out to spud, height increases
Add 2mm, promotes the wearability of creeper tread spud, linking arm and torque arm, engaging pin ear are played a certain protective role.In addition
According to army in actual use to the actual requirement of crawler belt derailing, induction tooth height is increased into 110mm by 100mm.
Second step manufactures sand mold, lower core mould assembling, using above-mentioned mold, manufactures sand mold using static press moulding technique.Roughing sand choosing
100-140 range is concentrated in 50/140 mesh, air penetrability with granularity.
Static press moulding technique refers to that air-flow is tight compact in advance first, then multiple contact ftercompction；Preparatory compacting effect, then again by
Incude multiple contact compacting, guarantees that the sand mold compactability of different depth type chamber is evenly distributed.Static press moulding technique has concentrated gas punching to make
The advantages of type and high pressure multiple contact moulding, high production efficiency, casting dimension accuracy are high, surface quality is good, and effectively reduce casting
Sand holes defect and blowhole defect, improve Internal Quality of Cast, and reduce resulting influence creeper tread intensity
With formation of crack factor.
Exhaust stick is increased at the top of the quadrangle and type core of upper sand mold and lower sand mold, makes to generate in sand mold in casting process
Gas can be discharged in time, prevent the casting flaws such as stomata, cold shut.
Lower core uses coated sand technology.Because the water-soluble additives such as clay, dextrin in tung oil sand needs plus water wetting, dry
Moisture can make temperature-rise ratio slower when dry, and sand core is not easy to dry thoroughly, and type core gas forming amount increases；Evaporation of the moisture in drying is broken
The continuity of bad oil film, reduces dry strength, causes creeper tread induction tooth inner cavity and creeper tread key position linking arm surface layer thick
Rough, the microcosmic stomata of formation, reduces intensity, and then become formation of crack.Precoated sand uses high-quality selected natural siliceous sand for roughing sand.It covers
Film sand process is that thermoplastic phenolic resin adds latent curing agent (methenamine) and lubricant to pass through certain overlay film work
Skill is configured to precoated sand, and the resin melting of sand grain surface is coated on when precoated sand is heated, and decomposites in Wu Luotuo precoated sand product
Methylene under the action of, the resin of melting is rapidly transformed into the three-dimensional-structure not melted by linear structure, to make precoated sand
Curing molding.Therefore, the indexs such as curing rate, release property, thermal stability, thermal conductivity, mobility, collapsibility are superior, have height
Intensity, high temperature resistant, it is low get angry, the feature that low bulk, anti-stick grittiness are good, keep crawler belt plate surface smooth, further decrease generation and split
Line probability.
Third step smelts steel scrap, prepares pour steel.
1) Alloying Element Vanadium and titanium are added before smelting, does raw core agent, i.e., first by the vanadium broken into pieces, titanium alloy particle, and
The vanadium broken into pieces and titanium alloy particle are placed in advance in steel ladle, with molten steel stream impulsive motion.
The thermal conductivity of potassium steel is more much lower than carbon steel (the only 1/3-1/2 of medium carbon steel thermal conductivity).Since thermal conductivity is low, make
It is slow to obtain solidification of molten steel, in the process of setting of steel, tree-shaped crystalline substance is grown coarse, it is easy to long column crystal into strips, in casting mold
Occur transcrystalline (coarse columnar grain runs through entire end face) when thermal conductivity is bad, such as external force and the column crystal direction of growth one
Cause to be broken when cause.Vanadium is added thus, titanium alloy element does raw core agent.Vanadium carbide, titanium carbide, vanadium nitrogen in smelting process
The particle of compound and titanium nitride is tiny, is suspended in molten steel at disperse, their fusing point is much higher than molten steel temperature, is able to maintain length
Time is not melted, and the crystalline phase of the carbide of this element and nitride and potassium steel lattice types having the same,
It can play the role of external core in the also close therefore crystallization process in potassium steel of lattice constant, can obviously refine crystal grain.
Crystal grain refinement can be such that dislocation density increases, and the basis of potassium steel processing hardening is exactly dislocation, and dislocation density increases, and promote to process
Hardening capacity improves, and in addition a small amount of high Hard Inclusion can increase potassium steel antiwear property, reduces crackle tendency.
2) it needs continuously to make white slag during the smelting reducing phase, and controlling phosphorus content should be 0.035% hereinafter, reducing harmful
Constituent content reduces non-metallic inclusion content to greatest extent.The method continuously made white slag and control phosphorus content is existing.
Non-metallic inclusion content influences the mechanical property of potassium steel, since potassium steel contains a large amount of manganese, produces in molten steel
Raw a large amount of manganese oxide (MnO), since solubility of the manganese oxide in molten steel is very big, and the solubility pole in solid-state molten steel
Small, in solidification of molten steel, a large amount of manganese oxide is washed out on the crystal boundary of steel in the form of nonmetallic and sundries, reduces the impact of steel
Toughness, and increase casting crack tendency.Require deoxygenation of liquid steel good when smelting potassium steel, as far as possible manganese oxide in reduction molten steel
Content, since the intensity and toughness of non-metallic inclusion are all very low, their effects in molten steel as cavity or crackle,
The ontology for isolating steel reduces the performance of steel.So continuously making white slag, the non-metallic inclusion and gas for reducing molten steel itself contain
Amount.
Phosphorus content, which should be controlled 0.035%, increases its brittleness hereinafter, being otherwise easily segregated in crystal boundary and forming iron phosphide eutectic, is beating
Crackle is easily formed in mill, repair welding and heat treatment process.Due to solubility very little of the phosphorus in austenite, and easily in crystal boundary and
Interdendritic segregation forms iron phosphide eutectic, reduces austenite grain boundary intensity and binding force, to make potassium steel plasticity and strong at room temperature
Degree is substantially reduced, studies have shown that phosphorus can also significantly reduce the wear-resisting and anti-fatigue performance of potassium steel.However, our factory produces Gao Meng
The chemical component of steel creeper tread requires to be not more than 0.08.Therefore, a large amount of phosphorus meeting segregations form iron phosphide eutectic tissue in grain boundaries and cause
Its reduced performance.By applying Dephosphorising agent smelting process, phosphorus content is controlled 0.035% hereinafter, obtaining high-quality molten steel.Due to
Potassium steel Si, Mn content is higher, and crystal grain has roughening to be inclined to.Therefore it must assure that aluminum content in Composition Control, in addition to this, be
Reinforcement thinning effect, prevents crystal grain in heat treatment process from growing up, micro vanadium is added in smelting process, reach refinement group
The purpose knitted.
4th step, casting, the tapping temperature 1590-1620 degree of molten steel, and it is primary to be poured preamble packet, and pouring temperature is made to exist
1425 positive and negative 10 degree.
1) the placing ceramic filter screen at cross gate two, the round hole uniformity of foam ceramic filter filter in molten steel
It is steady to fill type when improving the degree of purity of molten steel, and being poured for the objectionable impurities such as bubble, non-metallic inclusion, purifying molten metal.Pottery
The uniformity circular opening of porcelain filter screen will not generate new tiny vortex when passing through molten metal, more conducively realize and complete gold
Belong to liquid and the adjustment of laminar flow is changed by turbulent flow, to prevent the casting flaws such as volume gas, burning into sand, slag inclusion, while improving Gao Meng
Steel mechanical performance and bending strength achieve the purpose that surface hardness homogenizes；
2) former cylindrical riser is improved to the side shape riser for increasing volume consistent with linking arm end surface shape, guarantees to mend
Thoroughly, channel is unimpeded for contracting, and improving grain size number to guarantee linking arm dense internal organization reduces the probability cracked.
Crackle is that the shrinkage porosite of cast-internal and shrinkage cavity are accompanied, and is mostly dendrite in shrinkage porosite and the solidification of shrinkage cavity periphery, interdendritic is solidifying
Gu crackle, under impact loading, shrinkage porosite and shrinkage cavity periphery cannot be formed full of two by liquid metals by starting the opening generated
Germinate crackle out, by Fatigue, develops into tail portion crackle.Due to the growth of big column crystal limitation homogeneity equiax crystal, no
Same grain structure limits Feeding channel.Grain size directly affects mechanics performance, and crystal grain is thinner, hinders the crystal boundary of sliding more
Or grain boundary area is bigger, intensity is also higher.Refinement crystal grain is the effective means for improving polycrystalline material, according to dislocatioln theory,
Crystal boundary is the obstacle of dislocation motion, and under external force, neighboring die generates shear deformation, and grain boundaries must generate sufficiently large answer
Power is concentrated, and refinement crystal grain can produce more crystal boundaries, if grain boundary structure does not change, needs to apply bigger external force
Dislocation pile up can be generated, to make material reinforcement, plasticity and toughness are also better.Crystal grain is thinner, and plastic deformation is also dispersed in more
It is carried out in more crystal grain, keeps plastic deformation more uniform, the cracking chance as caused by stress concentration is reduced, and can bear bigger change
Shape amount, and crystal grain is thinner, and crystal boundary face is more, and crystal boundary is more tortuous, and crackle is not easy to germinate；Interlocking among crystal grain and crystal grain
Chance is more, is more unfavorable for the propagation and development of crackle, more fastens each other, and intensity and toughness are better.In fracture process
In can absorb more energy, show high-performance.
3) the pouring box number of every small pouring ladle is changed to 4 casees by original 5 casees, the duration of pouring is by original 5s~8s (second)
It is changed to 6s~11s, to guarantee to obtain high level grain size and good mechanical property.Because potassium steel metacollid is narrow, liquid phase
Only have 50 DEG C or so metacollids (liquidus curve is 1400 DEG C, and solidus is about 1350 DEG C) between line and solidus, so Gao Meng
Steel casting is sensitive to pouring temperature, and pouring temperature is slightly higher, and casting forms coarse-grain and columanar structure and shrinkage cavity and porosity etc.
Defect reduces mechanical property and wearability.The brittle transition temperature of steel is reduced with the reduction of pouring temperature.Crystal boundary under high temperature
Viscous flow is generated next time in stress, opposite sliding of the crystal grain along crystal boundary occurs, and then generate " diffusion creep ".
5th step is unpacked, and is unpacked after 50 minutes after casting.
Endless-track vehicle will be used for using the creeper tread of casting technique of the present invention manufacture, carries out walking test, test data ginseng
It is shown in Table 1.
1 creeper tread cracking breakout reviewing statistics table of table
Claims (3)
1. a kind of casting technique of potassium steel creeper tread, it is characterized in that：Specific step is as follows for the casting technique：
The first step determines manufacture mold；
Second step manufactures sand mold, lower core mould assembling；Using above-mentioned mold, sand mold is manufactured using static press moulding technique；In upper sand mold and
The quadrangle of lower sand mold and the top of type core increase exhaust stick, and lower core uses coated sand technology, precoated sand use natural siliceous sand for
Roughing sand；
Third step smelts steel scrap, prepares pour steel；
1) Alloying Element Vanadium is added before smelting and titanium does raw core agent；First by the vanadium broken into pieces, titanium alloy particle, and will break into pieces
Vanadium and titanium alloy particle are placed in advance in steel ladle, with molten steel stream impulsive motion；
2) white slag is continuously made during the smelting reducing phase, and controlling phosphorus content should be below 0.035%；
4th step, casting；The tapping temperature 1590-1620 degree of pour steel, and it is primary to be poured preamble packet, and pouring temperature is made to exist
1415~1435 degree；
1) the placing ceramic filter screen at cross gate two, the round hole uniformity of foam ceramic filter；
2) former cylindrical riser is improved to side shape riser consistent with linking arm end surface shape, and increasing volume；
It 3) is 4 casees by the pouring box number of every small pouring ladle, the duration of pouring is 6s~11s；
5th step is unpacked, and is unpacked after 50 minutes after casting.
2. a kind of casting technique of potassium steel creeper tread described in accordance with the claim 1, it is characterised in that：Mold in the first step
Meet following requirements,
(1) it does flat at the coupled spud of creeper tread linking arm, strengthens linking arm intensity；
(2) the pin ear Rib Thickness that creeper tread linking arm and plate body inside are connected is 10mm~11mm；
(3) landing for creeper tread linking arm spud raises upwardly 2mm；
(4) creeper tread linking arm tilts 7mm~8mm upwards since 1/3 length；
(5) driving pin ear arc surface height increases 1mm~1.5mm, and carries out the wing and connect with semicircle transition outside driving pin ear；
(6) one reinforcing rib of engaging pin ear position setting, as double reinforcing rib structures；
(7) between linking arm and engaging pin ear, torque arm wall thickness is 14mm for torque arm；
(8) induction tooth height is 110mm.
3. a kind of casting technique of potassium steel creeper tread described in accordance with the claim 1, it is characterised in that：In second step, roughing sand
Selection granularity is 50~140 mesh, and air penetrability is 100~140.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111644577A (en) * | 2020-06-12 | 2020-09-11 | 内蒙古第一机械集团股份有限公司 | Casting method for moving wheel and fixed wheel of comprehensive transmission system of tracked vehicle |
| CN116274883A (en) * | 2023-05-17 | 2023-06-23 | 山西中设华晋铸造有限公司 | Alloy steel casting method for vehicle crawler belt |
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| 刘喜俊: "《铸造工艺学》", 31 October 1999, 机械工业出版社 * |
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| CN111644577A (en) * | 2020-06-12 | 2020-09-11 | 内蒙古第一机械集团股份有限公司 | Casting method for moving wheel and fixed wheel of comprehensive transmission system of tracked vehicle |
| CN116274883A (en) * | 2023-05-17 | 2023-06-23 | 山西中设华晋铸造有限公司 | Alloy steel casting method for vehicle crawler belt |
| CN116274883B (en) * | 2023-05-17 | 2023-08-04 | 山西中设华晋铸造有限公司 | Alloy steel casting method for vehicle crawler belt |
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