Bimetal brake drum shell, wheel hub type component with similar structure and manufacturing method of wheel hub type component

Abstract

The invention discloses a manufacturing method of a bimetal brake drum shell and a hub part with a similar structure. The bimetal brake drum shell is the most typical. The method comprises the steps of material selection and cutting, punch forming, spoke plate thickening, spinning and rolling and the like. The thickness of the wheel disk of the wheel hub type component can be increased through the upsetting process, and then the wheel disk can be manufactured by using a thin steel plate as a raw material. The effective utilization rate of a steel plate material can be remarkably increased, the strength of the brake drum radial plate can be improved, and the spinning process cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of manufacturing automobile wheel, brake drum and other hub parts, in particular to a manufacturing method for manufacturing a double-metal brake drum shell and similar hub parts by using a thin steel plate as a starting material. BACKGROUND

[0002] Hub parts generally refer to barrel-shaped parts with ring-shaped web and rim structure, such as automobile wheels, brake drums and the like. They are composed of a cylindrical rim and a flat or flat-like ring-shaped web. At present, most of the hub parts are formed by stamping or spinning, while the web is generally formed by stamping or molding. In general, the thickness and strength requirements of the rim and the ring-shaped web may be different, and most of the time the thickness requirement of the web is greater than that of the rim. The manufacturing method is generally a split-body manufacturing method followed by ring welding, but welding naturally has inherent defects in structural quality. Although integral forming has fewer defects, it is difficult to process during integral forming. Generally, the ring-shaped web is cut out and then the rim ring-shaped band is spun to obtain a steel drum shell, and the ring-shaped web ring-shaped band is no longer processed.

[0003] Taking a brake drum of a heavy truck as an example, the brake drum of the heavy truck is a typical hub part. The commonly used double-metal brake drum is a steel drum shell with a layer of gray cast iron friction layer cast on the inner wall of the steel drum shell, so as to ensure the mechanical strength and toughness of the steel shell, and the inner layer uses the good friction performance of gray cast iron.

[0004] As shown in a double-metal brake drum shell structure in Figure 1 , which includes a rim 1 and a ring-shaped web 2, wherein the rim 1 further includes a transition section 13 and a shell layer 11, wherein one end of the transition section 13 is connected to the outer edge of the ring-shaped web 2, and the other end is connected to the shell layer 11. The shell layer 11 of the rim 1 is used for casting a gray cast iron friction layer 12. The ring-shaped web 2 is provided with a bolt hole 21 and a central mounting hole 22, the bolt hole 21 is used for connecting with other accessories through a bolt, and the central mounting hole 22 is used for positioning with other accessories.

[0005] The overall brake drum shell is made of steel material, in order to ensure the structural integrity and sufficient strength, it is best to be made of a steel plate, and the ring-shaped web 2, the transition section 13 of the rim and the shell layer 11 are best to be an integrated structure of the same material.

[0006] Referring to the drawings, Figures 2-4 , the manufacturing process of the brake drum shell in the prior art is generally to cut a circular ring-shaped steel plate; to stamp a hat-shaped primary shell with a central mounting hole 22 by stamping forming, as shown in the drawings Figure 2 ; and then to spin and thin the rim 1 and to roll form the rim 1 to obtain a steel drum shell, as shown in the drawings Figure 3Then the gray cast iron friction layer 12 is centrifugally cast in the shell layer 11, and the bolt holes 21 are punched on the annular web 2, thus completing the manufacturing process of the brake drum.

[0007] In this method, the annular web 2 is made of a steel plate material and is formed by stamping. After stamping, the annular web 2 is not further processed and maintains the thickness and strength of the original steel plate. The shell layer 11 of the wheel rim 1 is formed by spinning to a thickness of 4-8 mm and then roll-pressed into an annular wave shape. The transition section 13 is arranged between the shell layer 11 and the annular web 2 and has a gradually changing thickness. The thickness of the transition section 13 gradually changes from the thickness of the annular web 2 at the outer edge of the annular web 2 to the thickness of the shell layer 11 at the connection end of the transition section 13 with the shell layer 11. The gradually changing thickness of the transition section 13 is achieved by spinning.

[0008] The annular web 2 is a flat plate structure and is the thickest part of the overall brake drum shell. The annular web 2 does not need to be thinned by spinning and does not need to have the same thickness as the shell layer 11 and the transition section 13 of the wheel rim 1. However, the annular web 2 needs to have sufficient mechanical strength and toughness and needs to maintain a certain rigidity to ensure a certain anti-deformation performance and maintain the stability of the overall structure. In the prior art, the thickness of the annular web 2 of the brake drum shell is generally not less than 14.5 mm, which has become a convention. Even in cases where the performance requirement is not high, the thickness of the annular web 2 of the brake drum is generally designed and manufactured to be not less than 14.5 mm.

[0009] The double-metal brake drum shell in the prior art is manufactured as follows. In order to maintain the integrated structure of the shell layer 11 and the transition section 13 of the wheel rim 1 and the annular web 2, a whole flat steel plate is generally selected for cutting and blanking. After cutting and blanking, a circular plate is formed, as shown in Figure 2 The inner edge of the circular plate is hollowed out to form a central mounting hole 22 of the brake drum shell, and the outer edge of the mounting hole 22 is the inner edge of the circular plate. Then, the circular plate is stamped to form a hat-shaped primary shell of the brake drum, as shown in Figure 3 The shell layer 11 and the transition section 13 of the primary shell are then spun and roll-pressed to form the structure of the wheel rim 1, as shown in Figure 4 .

[0010] If a brake drum shell with an annular web 2 having a thickness of not less than 14.5 mm is required to be manufactured, the thickness of the selected steel plate should be not less than 14.5 mm. The shell layer 11 of the wheel rim is thinned to a thickness of 4-8 mm by spinning. This means that the greater the thickness of the selected steel plate, the greater the deformation required during spinning, and the higher the cost of the spinning process. If the initial thickness of the steel plate is reduced, the thickness and strength of the annular web 2 of the brake drum cannot be simultaneously satisfied, thus resulting in a difficult-to-overcome contradiction.

[0011] At the same time, because the flat plate state of the ring spoke 2 is not processed, the part of the central mounting hole 22 needs to be directly cut off during cutting, and this part of the steel plate can only be treated as scrap steel.

[0012] Even if the wheel rim 1 and the ring spoke 2 are made separately using different processes and different thicknesses of plates, and then connected by ring welding, this kind of brake drum shell can also be made, but the ring welding connection still has the problem of welding structure, and the waste generated by using different plates is more.

[0013] The material utilization efficiency of this manufacturing method in the prior art is calculated as follows: As shown in Figure 2 and Figure 5 , it is a schematic diagram of plate utilization rate of the brake drum shell in the prior art. As the diameter of the central mounting hole of the brake drum ring spoke 2 is set to 298 mm, the thickness of the ring spoke 2 itself is 14.5 mm, and the forming diameter of the ring spoke 2 of the brake drum shell is 390 mm. Then the steel plate with a thickness of 14.5 mm is needed, the cutting inner diameter of the circular ring plate material is 298 mm, the cutting outer diameter is 640 mm, and the weight of the circular ring plate is 28.663 kg, that is, the weight of the formed brake drum shell. It is calculated that the circular plate material at the position of the central mounting hole 22 can only be cut off and treated as scrap steel, and the weight of this part is 7.934 kg. After the central mounting hole 22 is opened in the steel plate, the circular ring plate from 298 mm to 390 mm is the steel plate material of the ring spoke 2, with a weight of 5.655 kg, and the circular ring plate from 390 mm to 640 mm is the steel plate material of the wheel rim 1, with a weight of 23.008 kg.

[0014] If the 640 mm circular steel plate (weight 36.598 kg) is used as the starting material, the effective utilization rate is 78.32%, and the scrap steel rate is 21.68%.

[0015] If a single square steel plate with a side length of 640 mm is used as the starting material, the square plate with a side length of 640 mm weighs 46.622 kg, the effective utilization rate is 61.48%, and the scrap steel rate is 38.52%.

[0016] If a long strip steel plate that can cut out 20 pieces of brake drum circular plate material is used for calculation, assuming that a long strip steel plate with a length of 6745 mm and a width of 1200 mm is used as an example (weight 921.299 kg), it can cut out 20 pieces of brake drum circular plate material, and the calculated steel plate effective utilization rate is 62.22%, and the scrap steel rate is 37.78%.

[0017] This traditional method is to use a steel plate with the same thickness as the annular web as the material, and the steel material of the central mounting hole part needs to be cut off and becomes scrap steel. If a method is developed to use a thinner steel plate as the starting material, the weight of the scrap steel cut off at the central mounting hole position in the annular web of the same weight will be reduced accordingly, and the utilization rate of the material can be improved.

[0018] In the above background, the inventor has developed a new brake drum structure, see Chinese invention patent ZL2021101508162, while the rim 1 of the brake drum shell is made into a double-layer metal structure, the annular web 2 of the brake drum is also made into a double-layer metal structure. Under the premise of using a thinner steel plate as the starting material, an annular groove is made on the annular web 2 of the brake drum, and a cast iron or cast steel structure layer is cast in the annular groove to increase the thickness of the annular web 2 of the brake drum, which can reduce the process difficulty of spinning the rim 1 and reduce the spinning process cost. However, this manufacturing method requires bending, stamping, and then casting the web 2 steel plate, and the process is not simple, and the cast joint of the double-layer structure of the brake drum web 2 cannot guarantee its structure and performance well.

[0019] In view of the above reasons, how to use a thinner steel plate to manufacture a brake drum shell that meets the requirements has become a problem to be solved. The inventor has developed a new manufacturing method for a brake drum shell, which can use a thin steel plate to manufacture a double-metal brake drum shell and ensure the thickness and strength of the web. The method of the present application can be directly used for the manufacture of similar hub parts. SUMMARY

[0020] The purpose of the present application is to provide a manufacturing method for a double-metal brake drum shell and a hub part with a similar structure to the double-metal brake drum shell, which can overcome the defect that thin steel plates cannot be used in the manufacture of such hub parts, while ensuring the thickness and strength of the web and reducing the manufacturing cost of such parts.

[0021] The double-metal brake drum shell and the manufacturing method for a hub part with a similar structure of the present application are suitable for a brake drum shell and similar hub parts with a rim and annular web integrally formed. A thin steel plate with a thickness less than that of the annular web is used as the raw material, and the thin steel plate at the annular web is locally upset and thickened to increase the thickness and strength of the web.

[0022] In the above-mentioned manufacturing method for a double-metal brake drum shell and a hub part with a similar structure, the rim and the annular web are integrally formed, and the thin steel plate at the rim is locally spun and rolled to form. Because a thin steel plate is used, the spinning process difficulty can be reduced when spinning and rolling.

[0023] In the method for manufacturing the dual-metal brake drum shell and the wheel hub component with similar structure as described above, the local upsetting and thickening process of the annular spoke further includes the processes of punching the arc-shaped annular protrusion, local heating, die clamping and upsetting and back-pressing.

[0024] In the method for manufacturing the dual-metal brake drum shell and the wheel hub component with similar structure as described above, the local heating temperature of the annular spoke during the upsetting and thickening process of the annular spoke is between 800 and 1200 degrees Celsius. This temperature range is most beneficial for the upsetting and back-pressing forming while maintaining the fluidity and structural strength of the steel material.

[0025] In the method for manufacturing the dual-metal brake drum shell and the wheel hub component with similar structure as described above, the method of thickening the spoke first and then spinning the rim can include the following steps: A: material selection and cutting: selecting a thin steel plate and cutting it into a circular ring-shaped plate; B: stamping forming: stamping the circular ring-shaped plate to form a cap-shaped primary component with a rim and an annular spoke rudiment; C: spoke thickening: locally upsetting and thickening the annular spoke of the primary component; D: spinning and rolling: spinning and rolling the rim.

[0026] In the method for manufacturing the dual-metal brake drum shell and the wheel hub component with similar structure as described above, due to the stamping first, the operation of punching the arc-shaped annular protrusion of the annular spoke can be performed simultaneously during the stamping forming process. The upsetting and thickening process of the annular spoke no longer includes the process of punching the arc-shaped annular protrusion, but only includes the processes of local heating, die clamping and upsetting and back-pressing.

[0027] In the method for manufacturing the dual-metal brake drum shell and the wheel hub component with similar structure as described above, the method of spinning the rim first and then thickening the spoke can include the following steps: A: material selection and cutting: selecting a thin steel plate and cutting it into a circular ring-shaped plate; B: rim spinning and rolling forming: spinning and rolling the rim to form a primary component structure; C: spoke thickening: locally upsetting and thickening the annular spoke of the primary component.

[0028] In the method for manufacturing the dual-metal brake drum shell and the wheel hub component with similar structure as described above, the method of thickening the spoke is the upsetting process, which further includes the processes of punching the arc-shaped annular protrusion, local heating, die clamping and upsetting and back-pressing. Due to the method of spinning the rim first and then thickening the spoke, the stamping process of the primary component can be omitted, but the process of punching the arc-shaped annular protrusion during the upsetting and thickening cannot be omitted.

[0029] The double-metal brake drum shell and similar hub parts of the present application include a wheel rim and a ring spoke. The ring spoke is formed by a upsetting thickening process of a thin steel plate material with a thickness less than the thickness of the ring spoke, and meets the microstructure and parameter characteristics after the upsetting thickening of the steel plate. The tensile strength of the ring spoke is greater than 400 MPa.

[0030] The manufacturing method of the double-metal brake drum shell and similar hub parts of the present application can achieve the following beneficial effects: I. The different processing techniques are used for the integral steel plate material to manufacture the integral structure hub parts, which can maintain the complete and consistent structure of the parts, maintain the strength of the parts, and overcome the quality defects of the welds and bonding layers caused by the welding or casting structure.

[0031] II. The upsetting thickening process is used for the ring spoke, so that the thinner steel plate can be used as the starting material, and the performance of the ring spoke after the upsetting thickening process is better than that of the ordinary steel plate.

[0032] III. The thickness of the starting material steel plate is thinner, so that the difficulty of the spinning process can be effectively reduced and the spinning process cost can be reduced when the wheel rim is spun.

[0033] IV. The material utilization rate is improved. The ring spoke 2 is partially upset and thickened, so that the size of the central mounting hole 22 can be initially opened to a smaller opening when the material is initially cut. Then, the size of the central mounting hole 22 is expanded by the upsetting and thickening of the ring spoke 2, so that the waste rate of the cutting of the central mounting hole 22 is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a schematic diagram of a half-section structure of a double-metal brake drum in the prior art; Figure 2 is a schematic diagram of blanking of a double-metal brake drum shell in the prior art; Figure 3 、 Figure 4 is a schematic diagram of a processing process of a brake drum shell in the prior art; Figure 5 is a schematic diagram of calculation of material utilization rate of a brake drum in the prior art; Figure 6 is a schematic diagram of blanking of a manufacturing method of embodiment 1 of the present application; Figure 7 is a schematic diagram of calculation of material utilization rate of a brake drum of embodiment 1 of the present application; Figure 8 is a schematic diagram of a processing process of a manufacturing method of embodiment 1 of the present application; Figure 9 is a schematic diagram of a processing process of a manufacturing method of embodiment 2 of the present application; Figure 10 This is a schematic diagram of the manufacturing process of Embodiment 3 of the present invention. Detailed Implementation

[0035] The following detailed description of the manufacturing method of the bimetallic brake drum housing and similar hub components of the present invention, with reference to the accompanying drawings and specific embodiments, takes the bimetallic brake drum housing as an example. The accompanying drawings and embodiments are only for explaining the technical solution and are not intended to limit the scope of protection.

[0036] Example 1: The bimetallic brake drum shell of this example has the same appearance and structural features as the conventional bimetallic brake drum shell. The brake drum shell consists of a rim 1 and an annular spoke 2. The rim 1 of the brake drum consists of a steel outer shell layer 11, a cast iron friction layer 12, and a transition section 13. The friction layer 12 is cast and bonded to the inner side of the outer shell layer 11. In this example, the annular spoke 2 of the brake drum shell is formed by upsetting and thickening a thin steel plate. The transition section 13 is integrally connected to the outer edge of the annular spoke 2, and the other end of the transition section 13 is integrally connected to the outer shell layer 11. The thickness of the brake drum shell decreases from the annular spoke 2, the transition section 13 to the outer shell layer 11. Different parts of the brake drum shell are processed using different methods, all made from the same integral steel plate material. The transition section and the outer shell layer 11 of the rim 1 are thinned by spinning and roll forming, while the annular spoke 2 is formed by thickening a thin steel plate material.

[0037] The manufacturing method of the brake drum housing in this embodiment requires the following steps: First, the brake drum shell is made using thin steel plates. The selected steel plate material can be a relatively thin steel plate, or a steel plate with a thickness less than that of the annular spoke 2. For example, when making a brake drum shell with an annular spoke 2 thickness of 14.5 mm, a steel plate with a thickness of 9 mm or even thinner can be used, instead of using a steel plate with the same thickness as the spoke 2.

[0038] Next, the material is cut and prepared, such as... Figure 6 , Figure 7 As shown, taking a brake drum housing of the same specifications as described in the background art as an example, the brake drum housing weighs 28.663 kg as described in the prior art above. It is still cut into circular plates, but due to the reduced steel plate thickness, the cutting dimensions are different from those of a 14.5 mm thick steel plate. The cutting requirement is an outer diameter of 753 mm and an inner diameter of 224 mm for the circular plate, forming a circular plate. The total effective material weight of the brake drum housing at this time is approximately 28.664 kg. The annular strip from 224 mm to 390 mm is the annular spoke 2, weighing 5.652 kg, and the annular strip from 390 mm to 753 mm is the rim 1, weighing 23.011 kg.

[0039] The weight of the overall circular plate is 31.446 kg when the diameter is 753 mm, and the weight of the cut-off part is 2.782 kg when the diameter is 224 mm. The remaining part is the brake drum shell, which weighs about 28.664 kg. At this time, it is obvious that the steel plate waste cut off at the central mounting hole 22 is significantly reduced, from 7.934 kg to 2.782 kg.

[0040] In the second step of stamping, the cut-off circular ring plate is subjected to stamping operation. The stamping die is set in advance, with a 390 mm ring line as the boundary, to stamp out the cap-shaped brake drum primary shell structure. As shown in Figure 8 When stamping and forming, the stamping die is set to simultaneously stamp the annular web plate 2 into an arc-shaped annular protrusion 23, so as to reduce the radial dimension of the annular web plate 2 and prepare for subsequent upsetting thickening.

[0041] In the third step of thickening, as shown in Figure 8 The annular web plate 2 is locally thickened by using the hot upsetting thickening process to heat and back-press the arc-shaped annular protrusion formed on the annular web plate 2. At this time, the inner diameter of the central mounting hole 22 of the annular web plate 2 is expanded from 224 mm to 298 mm, and the thickness of the circular ring part of the annular web plate 2 is also upset to about 14.5 mm.

[0042] In the fourth step of spinning and rolling, after the annular web plate 2 is formed by upsetting, the existing spinning process can be used to thin the shell layer 11 and part of the transition section 13 of the wheel rim 1, and then the rolling process is used to form a wave-shaped annular structure, thereby forming the brake drum shell finished product.

[0043] As shown in Figure 8 The above-mentioned third step of thickening the web plate 2 is realized by metal upsetting. First, the arc-shaped annular protrusion 23 is formed on the annular web plate 2. However, the second step of stamping and the third step of upsetting thickening are not strictly separated. That is, the arc-shaped annular protrusion 23 can be directly stamped out during the stamping process, or the stamping process can be completed and then the arc-shaped annular protrusion 23 can be formed separately.

[0044] Then, the part of the arc-shaped annular protrusion 23 is locally heated to a temperature of 800-1200 degrees Celsius, and the temperature is maintained. This temperature can realize plastic flow deformation of back-pressing without affecting the metal structure. On the upsetting machine, the die is set to limit the inner edge, outer edge and bottom of the steel plate of the annular web plate 2, and the arc-shaped annular protrusion 23 of the annular web plate 2 is back-pressed and deformed. The radial inner and outer limit and the axial bottom limit should be set, and the back-pressing upsetting is performed from the other axial direction. The steel material is flow-deformed and thickened, and the radial dimension is reduced. The upsetting effect is achieved.

[0045] After the above operations, the width of the annular band of the circular plate of the annular spoke 2 can be shortened from the original (224-390) / 2 to (298-390) / 2, the width of the annular spoke 2 can be shortened from the original approximately 83 mm to 49 mm, the diameter of the central mounting hole 22 can be enlarged from 224 mm to 298 mm, and the thickness of the annular band of the circular plate of the annular spoke 2 can be increased from 9 mm to 14.5 mm. At this time, the metal structure of the annular spoke 2 already conforms to the characteristics of a steel plate after plastic upsetting deformation, and its mechanical properties will also be improved compared to the original steel plate, such as the tensile strength can reach over 400 MPa.

[0046] The brake drum shell manufactured using the above process weighs approximately 28.664 kg, which is basically the same as described in the background art, and its structural dimensions are also basically the same as those in the background art.

[0047] like Figure 6 , Figure 7 As shown, the utilization rate of the board material in this embodiment is calculated as follows: If a 9mm circular plate with a diameter of 753mm is used directly, the circular plate weighs 31.446 kg, the brake drum shell weighs 28.664 kg, the material utilization rate reaches 91.09%, and the waste rate is 8.91%.

[0048] If a single square sheet with a side length of 753 mm is used, the weight of a single sheet is 40.059 kg, the material utilization rate can reach 71.55%, and the waste rate is 28.45%.

[0049] If we still calculate based on cutting 20 long strips of steel plate for brake drum shells, using steel plates with a thickness of 9 mm, a length of 7910 mm, and a width of 1410 mm, the steel plate weighs 787.966 kg. The total weight of the resulting brake drum shells is 573.26 kg, with a material utilization rate of approximately 72.75% and a scrap rate of 27.25%. The material utilization rate is significantly improved compared to existing technologies, the scrap rate is significantly reduced, and material costs can be effectively lowered.

[0050] Compared with the brake drum shell manufacturing method in the background art, the original sheet metal weight for manufacturing a single brake drum shell in the background art is 28.663 / 62.22% = 46.067 kg, generating 17.404 kg of waste. In this embodiment, the original sheet metal weight for a single brake drum shell is 28.663 / 72.75% = 39.399 kg, generating only 10.736 kg of waste. Therefore, the waste generated per brake drum can be reduced by 6.668 kg. Assuming the price difference between sheet metal and scrap steel is 1 yuan per kilogram, the material cost per brake drum can be reduced by 6.668 yuan, a significant improvement.

[0051] The brake drum shell of the embodiment is compared with the brake drum shell in the comparative document, the shell annular web 2 is an integrated molding structure, and problems such as stress of a bonding layer between different metal materials, bonding firmness, and deformation coefficient do not occur.

[0052] For the wheel rim spinning process, the embodiment is spun from 9 mm to 4 mm, and the spinning pressure, spinning times, and spinning time and other parameters are also reduced accordingly, which can effectively reduce the spinning process cost. When a steel plate with an initial thickness of 14.5 mm is spun to a thickness of 4 mm, it takes 205 seconds to reach the preset thickness when using a numerical control double spinning wheel spinning machine. When a steel plate with an initial thickness of 9 mm is used as a starting material, it takes 100 seconds to reach the preset thickness requirement when using the same type of spinning machine.

[0053] The material cost and process cost of the method of the present application and the prior art method are compared: taking the production of 10,000 brake drum shells as the accounting unit As can be seen from the above table, when producing brake drum shells by the method of the present application, the accounting cost of 10,000 is reduced by 56,680 yuan compared with the prior art, and the cost reduction effect is significant.

[0054] Embodiment 2: As Figure 9 shown, the material selection and cutting process of the embodiment is the same as that of embodiment 1, still using a 9 mm steel plate, and also adopting the web upsetting process, but the process sequence is slightly changed. For manufacturing a double-metal brake drum shell, the second step of the processing process is no longer stamping forming, and the web is not subjected to arc punching operation. Instead, the circular steel plate is directly spun and rolled on the spinning machine to form the structure of the wheel rim 1.

[0055] Then the annular web 2 is punched to form an arc-shaped annular protrusion 23, thereby reducing the radial dimension. Then the arc-shaped annular protrusion is formed by upsetting die pressing according to the requirements of the upsetting process. A double-metal brake drum shell with the same specifications can also be obtained.

[0056] Embodiment 3: As Figure 10 shown, the difference between the embodiment and embodiments 1 and 2 is that the structure of the punched arc-shaped annular protrusion 23 is slightly different. In embodiments 1 and 2, the arc-shaped annular protrusion 23 protrudes outwardly from the annular web 2, and in the present embodiment, the structure is protruded inwardly from the annular web 2, which can be realized by using different molds.

[0057] In the method of the present application, not only the wheel hub type component with the annular spoke thickness of 14.5 mm can be manufactured by using the 9 mm steel plate, but also the wheel hub type component with the same specification can be manufactured by using the steel plate with other thickness, only the blank size and process parameters are slightly changed, and compared with the method in the prior art, the method has some obvious beneficial effects.

[0058] I. Compared with the brake drum shell in the background art, the quality defects of the combined layer of the thin steel plate which needs to be cast with the cast iron structure layer to increase the thickness are overcome, and the process difficulty is reduced.

[0059] II. Compared with the traditional thick steel plate brake drum shell, when the 9 mm spinning thinning and the 14.5 mm spinning thinning are reduced, the spinning process difficulty is reduced, and the spinning process cost is reduced. Compared with the use of thick steel plate blank, the effect of reducing waste is obvious, and the material cost is reduced significantly.

[0060] III. The microstructure of the annular spoke after being deformed by stamping and back pressure flow deformation is more compact, and the structural strength is also increased, and the strength and other indicators of the 14.5 mm steel plate without treatment are obviously improved.

[0061] The above is a description taking the typical wheel hub type component double-metal brake drum shell as an example, and the method of the present application can be directly used for wheels and other wheel hub type components without creative labor.

[0062] The main beneficial effects of the present application are that on the basis of increasing the strength of the spoke, the thin steel plate can be used as the initial material, the process difficulty of the spinning thinning of the steel plate is reduced, and then the process cost is reduced. At the same time, due to the thickening operation of the spoke, the amount of waste is reduced, and the material cost is reduced.

Claims

1. A method of manufacturing a dual metal brake drum shell and similar hub-like components, suitable for brake drum shells and similar hub-like components in which the wheel rim and annular web are integrally formed, characterised in that: The thin steel plate with a thickness less than the thickness of the annular spoke is used as a raw material, and the thin steel plate at the annular spoke is locally upset and thickened to be formed.

2. The method of manufacturing a bimetallic brake drum shell and similar hub-like components according to claim 1, characterized in that: The wheel rim is integrally formed with the annular spoke, and the thin steel plate at the wheel rim is locally spun and rolled to be formed.

3. The method of claim 2, wherein: The annular spoke upsetting and thickening process further includes the processing of punching an arc-shaped annular protrusion, local heating, mold clamping, and upsetting and back pressure on the thin steel plate at the annular spoke.

4. The method of manufacturing a bimetallic brake drum shell and similar hub-like components according to claim 3, characterized in that: The local heating temperature of the annular spoke during the upsetting and thickening process is between 800-1200 degrees Celsius.

5. The method of manufacturing a bimetallic brake drum shell and the like hub-like components according to any one of claims 1-4, characterized in that: Specifically, the following steps are included: A: material selection and cutting: selecting a thin steel plate and cutting it into a circular ring-shaped plate; B: stamping and forming: stamping the circular ring-shaped plate to form a hat-shaped primary component with a wheel rim and an annular spoke; C: spoke thickening: locally upsetting and thickening the annular spoke of the primary component; D: spinning and rolling: spinning and rolling the wheel rim.

6. The method of manufacturing a bimetallic brake drum shell and similar hub-like components according to claim 5, characterized in that: During the stamping and forming process, the operation of punching an arc-shaped annular protrusion on the annular spoke is performed simultaneously, and the annular spoke upsetting and thickening process includes the processing of local heating, mold clamping, and upsetting and back pressure.

7. The method of manufacturing a bimetallic brake drum shell and similar hub-like components according to any one of claims 1-4, characterized in that: Specifically, the following steps are included: A: material selection and cutting: selecting a thin steel plate and cutting it into a circular ring-shaped plate; B: wheel rim spinning and rolling forming: spinning and rolling the wheel rim to form a primary component structure; C: spoke thickening: locally upsetting and thickening the annular spoke of the primary component.

8. The method of claim 7, wherein: The annular spoke thickening method is an upsetting process, which further includes the processing of punching an arc-shaped annular protrusion, local heating, mold clamping, and upsetting and back pressure.

9. A dual metal brake drum shell and similar hub-like component comprising a wheel rim and annular spokes, characterised in that: The annular spoke is made of a thin steel plate with a thickness less than the thickness of the spoke, which is thickened by the upsetting and thickening process, and meets the microstructure and parameter characteristics after the steel plate upsetting and thickening. The tensile strength of the annular spoke reaches more than 400Mpa.

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