CN107088652B - Preparation process of bimetal brake drum - Google Patents
Preparation process of bimetal brake drum Download PDFInfo
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- CN107088652B CN107088652B CN201710470850.1A CN201710470850A CN107088652B CN 107088652 B CN107088652 B CN 107088652B CN 201710470850 A CN201710470850 A CN 201710470850A CN 107088652 B CN107088652 B CN 107088652B
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- mold
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- steel ring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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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
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- 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
Abstract
The invention provides a preparation process of a bimetallic brake drum, which comprises the following steps of firstly, manufacturing a steel ring according to a design size; then, the nodular cast steel and the nodular cast iron are dissolved into molten steel and molten iron for later use; manufacturing a mould according to the design size, wherein the mould consists of an outer mould and an inner mould; the inner mold is pressed and formed on the moving vehicle by adopting a foundry material, and then the inner cavity wall of the outer mold is coated with a refractory coating; then heating the steel ring to 800 ℃; clamping the heated steel ring into the outer mold to form an embedded part; then the outer mold provided with the steel ring is reversely buckled on the inner mold for positioning, and a cavity is formed after positioning; inserting one or two position measuring cylinders at the top of the inverted outer mold; pouring molten iron into the steel ring to contact and compound the molten iron and the steel ring; pouring molten steel when molten iron is poured to a preset position; and finally, cooling, demolding and processing. The brake drum has the advantages of good friction coefficient and strong braking force, prolongs the service life of the whole brake drum, improves the safety performance of automobile braking, and reduces the running cost of the automobile.
Description
Technical Field
The invention relates to the technical field of automobile brake drums, in particular to a preparation process of a bimetal brake drum.
Background
The automobile brake drum plays an important role in a brake system of a heavy-duty automobile, and the brake drum with excellent performance is one of the preconditions for the safe driving of the heavy-duty automobile. Cast iron has relatively high strength, good wear resistance and relatively low material and manufacture cost, and is a widely used material for brake drums of trucks for a long time. Although the cast iron brake drum is applied and developed for many years, the cast iron brake drum widely used at present is easy to crack after being used for a long time, so that the brake fails, even traffic accidents happen in serious cases, and the requirements of high brake performance and long service life of heavy automobiles cannot be met.
The steel ring can prevent the brake drum from cracking, and is pressed into the outer diameter of the reinforcing belt of the brake drum body by a press machine and then fixed by screws. The method can not ensure that the steel ring and the reinforcing belt are firmly combined and are easy to fall off in the using process. Meanwhile, a single metal material is difficult to simultaneously meet the requirements of high toughness, high strength and high wear resistance, and cannot meet the requirement of modern production on the comprehensive performance of the material.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation process of a bimetal brake drum, which has the advantages of good friction coefficient, strong braking force, high safety performance and low operation cost.
In order to realize the purpose, the technical scheme provided by the invention is as follows: a preparation process of a bimetal brake drum,
1) manufacturing a steel ring according to the design size;
2) melting cast steel and cast iron into molten steel and molten iron for later use;
3) manufacturing a mould according to the design size, wherein the mould consists of an outer mould and an inner mould, and the outer mould is provided with an exhaust hole;
4) the inner mold is pressed and formed by adopting a foundry material, and then the inner cavity wall of the outer mold is coated with a refractory coating;
5) heating the steel ring to 800 ℃;
6) clamping the heated steel ring into the outer mold, and positioning and fixing to form an embedded part;
7) the outer die provided with the steel ring is reversely buckled on the inner die, and a cavity is formed between the inner cavity wall of the reversely buckled outer die and the outer wall of the inner die;
8) one or two position measuring cylinders are inserted into the top of the inverted outer mold;
9) pouring molten iron into the molten iron barrel on one side of the top of the outer mold, quickly heating the steel ring to 900-1000 ℃ after the molten iron is poured into the steel ring, and contacting and compounding the molten iron and the steel ring;
10) observing through a position measuring cylinder, pouring molten steel into the molten steel through an injection port when the molten steel is poured to a preset position;
11) cooling, demoulding and processing.
The mold consists of an outer mold and an inner mold sleeved in the outer mold, a cavity is formed between the sleeved outer mold and the inner mold, the outer mold comprises an outer cylinder made of metal materials, the top and the bottom of the outer cylinder are respectively connected and fixed through corresponding reinforcing rings, handles are arranged on two sides of the outer wall of the outer cylinder, a plurality of exhaust holes which are penetrated from inside to outside are uniformly distributed on the cylinder wall of the outer cylinder, the inner mold is pressed and formed on a moving vehicle or a conveying belt by adopting pulverized coal, clay and quartz sand, an annular positioning ring is arranged at the bottom of the inner mold, a concave stepped groove is formed at the inner ring of the positioning ring in a concave mode, and a conical guide column with a small upper part and a large lower part is arranged at the top of the positioning ring; a top cover is arranged at the top of the sleeved outer barrel, a plurality of top cover air holes which penetrate through the top cover up and down are formed in the top cover, an injection hole is formed in the center of the top cover, a flow guide column is located in the center of the injection hole, and an injection hole is reserved between the injection hole and the flow guide column; a position measuring cylinder is arranged on the top cover on one side of the injection port, the wall of the outer cylinder at the edge of the top cover is expanded outwards to form a molten iron injection seat, a molten iron cylinder is arranged on the molten iron injection seat, and the bottom of the molten iron cylinder is connected with the lower part of the cavity.
The outer cylinder is a cylinder formed by combining a plurality of vertical plates with arc-shaped sections, and the outer side of the outer cylinder is fixedly connected with the reinforcing ring through an outer ring.
The technical advantages of the invention are as follows:
(1) the high toughness and high strength of the low-carbon steel are combined with the excellent wear-resistant braking performance of the cast iron, so that the influence of the brittleness of the cast iron on the brake drum of the truck is reduced;
(2) by optimizing measures such as casting technology and the like, the composite interface achieves metallurgical bonding, the defects of casting cracking, spots, abnormal abrasion and the like are reduced, and the performance of the brake drum is improved;
(3) the steel die precoated sand composite casting process is adopted, the size precision of the brake drum of the truck is greatly improved, the concentricity, the wall thickness uniformity and the balance degree of the brake drum are all improved, the vibration and the noise of a vehicle are reduced, and the service life of the brake drum is prolonged.
(4) The product is detected by the national motor vehicle quality supervision and inspection center, the performance parameters such as torsional fatigue strength, running-in, efficiency, heat fading and recovery and the like are all superior to the national standard, and particularly the internal tension is up to 225 kN, which is higher than the level of the similar products.
(5) The product produced by the process can produce good economic benefit; the popularization and the application of the product have good social benefits for improving the braking safety performance of the heavy-duty automobile in China and reducing the operation cost.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural view of a guide pillar according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings, in which preferred embodiments of the invention are: referring to fig. 1 and 2, in the process for manufacturing the bimetal brake drum of the present embodiment,
1) manufacturing a steel ring according to the design size, wherein the section of the steel ring is square or rhombic;
2) the nodular cast steel and the nodular cast iron are dissolved into molten steel and molten iron for standby;
3) manufacturing a mould according to the design size, wherein the mould consists of an outer mould and an inner mould, and the outer mould is provided with an exhaust hole;
4) the inner mold is pressed and formed on the moving vehicle by adopting a foundry material, and then the inner cavity wall of the outer mold is coated with a refractory coating;
5) heating the steel ring to 800 ℃;
6) clamping the heated steel ring into the outer mold, and positioning and fixing the steel ring through iron nails to form an embedded part;
7) the outer die provided with the steel ring is reversely buckled on the inner die, the bottom of the reversely buckled outer die is positioned through a positioning ring at the bottom of the inner die, and a cavity is formed between the inner cavity wall of the outer die and the outer wall of the inner die after positioning;
8) one or two position measuring cylinders are inserted into the top of the inverted outer mold;
9) pouring molten iron along a central hole at the top of the outer mold, quickly heating the steel ring to 900-;
10) observing through a position measuring cylinder, and pouring molten steel when molten iron is poured to a preset position;
11) cooling, demoulding and processing.
The mold of the bimetal brake drum is composed of an outer mold and an inner mold sleeved in the outer mold, the outer mold comprises an outer cylinder 1 made of metal materials, the top and the bottom of the outer cylinder 1 are respectively connected and fixed through corresponding reinforcing rings 2, the outer cylinder 1 is in a cylindrical shape formed by combining a plurality of vertical plates with arc-shaped cross sections, the outer side of the outer cylinder 1 is connected and fixed through an outer ring and the reinforcing rings 2, handles 3 are arranged on two sides of the outer wall of the outer cylinder 1, a plurality of exhaust holes 4 which penetrate through the inner side and the outer side are uniformly distributed on the cylinder wall of the outer cylinder 1, the inner mold is formed on a moving vehicle 12 in a pressing mode by adopting pulverized coal, clay and quartz sand, an annular positioning ring 5 is arranged at the bottom of the inner mold, the inner ring of the positioning ring 5 is concave to form a concave stepped groove 6, and a conical diversion column 7 with a small upper part and a large part is arranged at the top of the positioning ring 5; a top cover 8 is arranged at the top of the sleeved outer barrel 1, a plurality of top cover air holes 9 which penetrate through the top cover 8 from top to bottom are formed in the top cover 8, an injection hole 10 is formed in the center of the top cover 8, the flow guide column 7 is located in the center of the injection hole 10, and an injection hole is reserved between the injection hole 10 and the flow guide column 7; a position measuring cylinder 11 is arranged at the edge of the top cover 8.
The data of the brake drum produced according to the scheme after result identification are as follows:
the above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that the changes in the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. The preparation process of the bimetal brake drum is characterized by comprising the following steps:
1) manufacturing a steel ring according to the design size;
2) melting cast steel and cast iron into molten steel and molten iron for later use;
3) manufacturing a mould according to the design size, wherein the mould consists of an outer mould and an inner mould, and the outer mould is provided with an exhaust hole;
4) the inner mold is pressed and formed by adopting a foundry material, and then the inner cavity wall of the outer mold is coated with a refractory coating;
5) heating the steel ring to 800 ℃;
6) clamping the heated steel ring into the outer mold, and positioning and fixing to form an embedded part;
7) the outer die provided with the steel ring is reversely buckled on the inner die, and a cavity is formed between the inner cavity wall of the reversely buckled outer die and the outer wall of the inner die;
8) one or two position measuring cylinders are inserted into the top of the inverted outer mold;
9) pouring molten iron into the molten iron barrel on one side of the top of the outer mold, quickly heating the steel ring to 900-1000 ℃ after the molten iron is poured into the steel ring, and contacting and compounding the molten iron and the steel ring;
10) observing through a position measuring cylinder, pouring molten steel into the molten steel through an injection port when the molten steel is poured to a preset position;
11) cooling, demoulding and processing.
2. The mould of bimetal brake drum, its characterized in that: the mold comprises an outer mold and an inner mold sleeved in the outer mold, a cavity is formed between the sleeved outer mold and the inner mold, the outer mold comprises an outer cylinder (1) made of a metal material, the top and the bottom of the outer cylinder (1) are respectively connected and fixed through corresponding reinforcing rings (2), handles (3) are arranged on two sides of the outer wall of the outer cylinder (1), a plurality of exhaust holes (4) which penetrate through the inside and the outside are uniformly distributed on the cylinder wall of the outer cylinder (1), the inner mold is pressed and formed on a moving vehicle or a conveying belt (12) by adopting pulverized coal, clay and quartz sand, an annular positioning ring (5) is arranged at the bottom of the inner mold, the inner ring of the positioning ring (5) is concave to form a concave stepped groove (6), and the top of the positioning ring (5) is provided with a conical guide column (7) which is small at the top and large at the bottom; a top cover (8) is arranged at the top of the sleeved outer barrel (1), a plurality of top cover air holes (9) which penetrate through the top cover (8) up and down are formed in the top cover (8), an injection hole (10) is formed in the center of the top cover (8), the flow guide column (7) is located in the center of the injection hole (10), and an injection hole is reserved between the injection hole (10) and the flow guide column (7); a position measuring cylinder (11) is arranged on the top cover (8) on one side of the injection port, the cylinder wall of the outer cylinder (1) at the edge of the top cover (8) is outwards expanded to form a molten iron injection seat, a molten iron cylinder (13) is arranged on the molten iron injection seat, and the bottom of the molten iron cylinder (13) is connected with the lower part of the cavity.
3. The mold for a bimetallic brake drum as in claim 2, wherein: the outer cylinder (1) is in a cylinder shape formed by combining a plurality of vertical plates with arc-shaped sections, and the outer side of the outer cylinder (1) is fixedly connected with the reinforcing ring (2) through an outer ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710470850.1A CN107088652B (en) | 2017-06-20 | 2017-06-20 | Preparation process of bimetal brake drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710470850.1A CN107088652B (en) | 2017-06-20 | 2017-06-20 | Preparation process of bimetal brake drum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107088652A CN107088652A (en) | 2017-08-25 |
| CN107088652B true CN107088652B (en) | 2022-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710470850.1A Active CN107088652B (en) | 2017-06-20 | 2017-06-20 | Preparation process of bimetal brake drum |
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| CN (1) | CN107088652B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114951583A (en) * | 2022-05-16 | 2022-08-30 | 绵阳市联重科技有限公司 | Production method of bimetal brake drum |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5945073A (en) * | 1982-09-08 | 1984-03-13 | Jidosha Imono Kk | Wheel hub with brake drum and casting method thereof |
| JP3449582B2 (en) * | 1995-08-02 | 2003-09-22 | 日産ディーゼル工業株式会社 | Automotive brake drum |
| CN2350148Y (en) * | 1998-08-03 | 1999-11-24 | 李钟毅 | Mould for casting brake drum of car |
| CN101618452B (en) * | 2009-07-27 | 2010-11-10 | 河南省汤阴县华兴机械制造有限公司 | Method for manufacturing brake drum for automobile |
| CN105090292A (en) * | 2014-05-17 | 2015-11-25 | 彭松桂 | Brake drum in which flat steel ring is embedded and manufacturing method of brake drum |
| CN106001452A (en) * | 2016-06-30 | 2016-10-12 | 娄土岭 | Brake drum casting process |
| CN206966613U (en) * | 2017-06-20 | 2018-02-06 | 彭松桂 | The mould of bi-metal brake drum |
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2017
- 2017-06-20 CN CN201710470850.1A patent/CN107088652B/en active Active
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| CN107088652A (en) | 2017-08-25 |
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