A kind of manufacture method of brake drum and a kind of brake drum
Technical field
The present invention relates to automobile braking device technical field, more particularly, particularly a kind of manufacture method of brake drum and a kind of brake drum.
Background technology
Brakes is one of important composition system of automobile, and it plays very important effect at the secure context of automobile.At present, in truck field, widely used is adopt traditional monoblock cast drum brake.In prior art, comparatively typical brake is friction brake, and the frictional heat produced when namely utilizing brake apparatus to work consumes the kinetic energy that vehicle has gradually, to reach the object reducing car speed or parking.
At present, on truck extensive use be by grey cast-iron cast-in-block drum brake.Grey cast-iron is a kind of widely used friction material, but its intensity is low, fragility large, causes the sidewall of brake drum must have larger thickness.When automobile heavy-load, run at high speed time, especially when lower long slope or abrupt slope, because brake force is large, and continuous several times braking, brake drum inner wall temperature is sharply raised, and internal-external temperature difference strengthens, and the mechanical behavior under high temperature of brake drum material also sharply declines.Brake drum wall thickness is thicker, and internal-external temperature difference is larger.Thermal (temperature difference) stress adds that the mechanical behavior under high temperature of material worsens, and often causes brake drum inwall to develop into be full of cracks by longitudinal fine fisssure, so that last brake drum cracking.
In addition, additionally provide a kind of bi-metal brake drum in prior art, be designed to the cylinder of composite casting by brake drum shell and wear-resistant material layer, the shell be made up of drum barrel and drum is integral type structure.
In the brake drum of above-mentioned two kinds of structures,
There are the following problems for the first:
Drum barrel must do thicker with drum, just can reach the intensity required by brake drum;
There are the following problems for the second:
Drum barrel and drum are by the integral structure of monoblock steel plate by rotary pressing processing, this that one piece of Area comparison is large, and Thickness Ratio thicker (about 14 ㎜) is by the thinning method (drum barrel place thickness is about 6 ㎜) of spinning, and technology difficulty is very large.
In sum, how to reduce the difficulty of brake drum production technology, become those skilled in the art's problem demanding prompt solution.
Summary of the invention
The technical problem to be solved in the present invention is for providing a kind of manufacture method of brake drum and a kind of brake drum, and use the manufacture method of this brake drum to carry out the manufacturing of brake drum, its technology difficulty is lower.In the present invention, this brake drum, by its structural design, also can reach the object reducing brake drum producting process difficulty.
For solving the problems of the technologies described above, the invention provides a kind of manufacture method of brake drum, comprising step:
S1, elementary, secondary drum barrel manufacture, be raw material with bar steel plate, rolled up and justify and be welded into the elementary drum barrel of cylinder-like structure design, and roll extrusion process is carried out to described elementary drum barrel, make the barrel of described elementary drum barrel be shaped to corrugated, make secondary drum barrel thus;
S2, elementary drum manufacture, with the disk steel plate with mesopore for raw material, carry out spinning to it and form elementary drum;
S3, brake drum shell manufacture, and weld, make brake drum shell to described secondary drum barrel and described elementary drum;
S4, casting frictional layer, antiwear cast iron alloy of casting in described brake drum shell forms frictional layer.
Preferably, also comprise step after described step S4 casting frictional layer: S5, frictional layer process, machining process is carried out to the installed surface of described frictional layer and described elementary drum.
Present invention also offers a kind of brake drum, comprise brake drum shell and frictional layer, described frictional layer is arranged in described brake drum shell,
Described brake drum shell comprises into drum barrel and the drum of split type structural design, and described drum barrel is combined with described drum and forms described brake drum shell.
Preferably, described drum barrel and described drum are by being welded to connect.
Preferably, the inwall of described drum barrel has wavy bulge-structure.
Preferably, described frictional layer is antiwear cast iron alloy frictional layer, and described frictional layer waters and casts from described brake drum shell.
In above-mentioned four steps, the manufacture of step S1 to step S3 mainly brake drum shell.
From above-mentioned steps, in the present invention, brake drum shell is made up of two parts, and it comprises: drum barrel and drum.Drum barrel designs for cylinder-like structure, carries out pressing operation by rolling device in the outside of drum barrel, the barrel of drum barrel is out of shape thus is formed to have wave structure design.After drum barrel has wave structure design, then the casting carrying out frictional layer can improve the contact area between frictional layer and drum barrel, improves the structural strength between brake drum shell and frictional layer, improves the rigidity of brake drum.Further, the wave structure forming operation on drum barrel is also comparatively simple.
In the present invention, brake drum shell all adopts sheet material to make, and its manufacturing process is simple.Further, drum barrel and drum adopt and are welded to connect, and its bonding strength is higher, the reliability of improving the quality of products dramatically.
Present invention also offers a kind of brake drum, comprise brake drum shell and frictional layer.Brake drum shell comprises into drum barrel and the drum of split type structural design, and drum barrel is combined with drum and forms brake drum shell.Drum barrel and drum adopt split-type structural design, when manufacturing, can process respectively, so can reduce the difficulty of brake drum shell production technology dramatically to drum barrel and drum.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the flow chart of the manufacture method of brake drum in an embodiment of the present invention;
Fig. 2 is the flow chart of step S1 in the manufacture method of brake drum in an embodiment of the present invention;
Fig. 3 is the flow chart of step S2 in the manufacture method of brake drum in an embodiment of the present invention;
Fig. 4 is the flow chart of step S3 to step S5 in the manufacture method of brake drum in an embodiment of the present invention;
Fig. 5 is the structural representation of a kind of brake drum in the present invention;
Fig. 6 be drum barrel and the drum of a kind of brake drum in the present invention dock welding manner;
Fig. 7 is the drum barrel of a kind of brake drum in the present invention and the overlap joint welding manner of drum;
Fig. 8 is the drum barrel of a kind of brake drum in the present invention and the three-layer metal welding manner of drum;
Wherein, in Fig. 5, the corresponding relation of component names and Reference numeral is:
Drum barrel 1; Drum 2; Frictional layer 3.
Detailed description of the invention
Core of the present invention is for providing a kind of manufacture method of brake drum and a kind of brake drum.
In the manufacture method of brake drum provided by the invention, brake drum shell is adopted split-type structural design, process drum barrel and drum respectively, use the manufacture method of this brake drum to carry out the manufacturing of brake drum, its technology difficulty is lower.
In the present invention, this brake drum adopts split-type structural design, by this design, also can reach the object reducing brake drum producting process difficulty.
In order to make those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1 to Fig. 5, wherein, Fig. 1 is the flow chart of the manufacture method of brake drum in an embodiment of the present invention; Fig. 2 is the flow chart of step S1 in the manufacture method of brake drum in an embodiment of the present invention; Fig. 3 is the flow chart of step S2 in the manufacture method of brake drum in an embodiment of the present invention; Fig. 4 is the flow chart of step S3 to step S5 in the manufacture method of brake drum in an embodiment of the present invention; Fig. 5 is the structural representation of a kind of brake drum in the present invention.
The invention provides a kind of manufacture method of brake drum, for the manufacturing of brake drum.In the present invention, step is included:
S1, elementary, secondary drum barrel manufacture, and are raw material with bar steel plate, roll ups and justify and be welded into the elementary drum barrel that cylinder-like structure designs, and carry out roll extrusion process to elementary drum barrel, make the barrel of elementary drum barrel be shaped to corrugated, make secondary drum barrel thus;
S2, elementary drum manufacture, with the disk steel plate with mesopore for raw material, carry out spinning to it and form elementary drum;
S3, brake drum shell manufacture, and weld, make brake drum shell to secondary drum barrel and elementary drum;
S4, casting frictional layer, antiwear cast iron alloy of casting in brake drum shell forms frictional layer.
In above-mentioned four steps, the manufacture of step S1 to step S3 mainly brake drum shell.
From above-mentioned steps, in the present invention, brake drum shell is made up of two parts, and it comprises: drum barrel and drum.Drum barrel designs for cylinder-like structure, carries out pressing operation by rolling device in the outside of drum barrel, the side of drum barrel is out of shape thus forms the side with wave structure design.After drum barrel has wave structure design, then the casting carrying out frictional layer can improve the contact area between frictional layer and drum barrel, improves the structural strength between brake drum shell and frictional layer.Further, the wave structure forming operation on drum barrel is also comparatively simple.
In the present invention, brake drum shell all adopts sheet material to make, and its manufacturing process is simple.Further, drum barrel and drum adopt and are welded to connect, and its bonding strength is higher, the reliability of improving the quality of products dramatically.
In order to improve the product quality of brake drum further, also comprise step after step s4:
S5, frictional layer process, carry out machining process to the installed surface of frictional layer and elementary drum.By polishing to the cutting of frictional layer, the dimensional accuracy of frictional layer can be improved, and improve the roughness of frictional layer inner surface.
Please refer to Fig. 5, present invention also offers a kind of brake drum, comprise brake drum shell and frictional layer 3.Frictional layer 3 is arranged in brake drum shell, and frictional layer 3, for contacting with brake-shoe (of brakes forms component), realizes deceleration, the stopping of vehicle by friction.
In the present invention, brake drum shell comprises into drum barrel 1 and the drum 2 of split type structural design, and drum barrel 1 is combined with drum 2 and forms brake drum shell.Drum barrel 1 and drum 2 adopt split-type structural design, when manufacturing, can process respectively, so can reduce the difficulty of brake drum shell production technology dramatically to drum barrel 1 and drum 2.
From the above, brake drum provided by the invention can carry out production and processing by above-mentioned manufacture method, forms ripple struction by rolling technology on brake drum shell, and its technique is simple, the adhesion between brake drum shell and frictional layer 3 can also be improved simultaneously, ensure product quality.
Particularly, in the present embodiment, drum barrel 1 and drum 2 are by being welded to connect.Be welded to connect implementing process simple, and its bonding strength is higher.
In one particular embodiment of the present invention, the inwall of drum barrel 1 has wavy bulge-structure.By this structural design, the bonded area between the inwall of drum barrel 1 and frictional layer 3 improves, and its bond strength have also been obtained and improves largely.
Particularly, in the present embodiment, frictional layer 3 is antiwear cast iron alloy frictional layer, and frictional layer 3 waters and casts from brake drum shell.
Brake drum provided by the invention a kind ofly carries out retarding braking by the frictional force between shoe brake and brake drum, because brake drum needs to stop operating fast under the state of High Rotation Speed, the breaking force that the shoe brake that it bears applies will be very large, so makes drum barrel 1 and frictional layer 3 all can produce larger moment of torsion.In order to avoid to deform owing to bearing larger torsional interaction between drum barrel 1 and frictional layer 3 or situation about rupturing occurs to misplace in junction, the inwall of drum barrel 1 is in the present embodiment provided with ripple struction, by increasing the bonded area between drum barrel 1 and frictional layer 3, improve the relative friction forces between drum barrel 1 and frictional layer 3, reduce the trend of two recurring structure change.
Please refer to Fig. 6, Fig. 7 and Fig. 8, Fig. 6 be drum barrel and the drum of a kind of brake drum in the present invention dock welding manner; Fig. 7 is the drum barrel of a kind of brake drum in the present invention and the overlap joint welding manner of drum; Fig. 8 is the drum barrel of a kind of brake drum in the present invention and the three-layer metal welding manner of drum, and certainly, the welding manner that drum barrel 1 and drum 2 coil can also be other welding manner, and the welding manner of the present invention to drum barrel 1 and drum 2 does not do concrete restriction.
Above the manufacture method of a kind of brake drum provided by the present invention and a kind of brake drum are described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.