CN1051483C - Sheet Metal Part with Annular Peripheral Wall and Thickening Method for Its Annular Peripheral Wall - Google Patents

Abstract

The present invention relates to a sheet metal member provided with an annular peripheral wall and a method for thickening the annular peripheral wall. In this invention, the annular peripheral wall is thickened to 2 times or more and 3 times or more the thickness of the chassis. Teeth for a timing belt and a gear are milled in the thickened annular peripheral wall. The method for thickening the annular peripheral wall of the present invention is to hold a base plate integrated with a brim portion between a rotary upper die and a rotary lower die, press the brim portion extending outward radially inward in a sequence of contacting the annular molding surfaces of a plurality of rotary rollers, thicken the brim portion, and form a cylindrical wall concentric with a dial. According to this method, it is not necessary to separately form the peripheral wall and the base plate and weld them together, and the strength necessary for milling teeth can be obtained in the peripheral wall.

Description

Sheet Metal Part with Annular Peripheral Wall and Thickening Method for Its Annular Peripheral Wall

The invention relates to a plate metal part provided with an annular peripheral wall such as a driving disc and a method for thickening the annular peripheral wall. More specifically, it relates to a method of forming an annular peripheral wall having a wall thickness several times that of a disc-shaped sheet metal material having a thin wall. The thickened annular peripheral wall of the present invention is suitable for forming teeth matched with synchronous belts, gears, etc., so that the milled teeth have sufficient strength and tooth thickness, and are especially suitable for automobile parts.

A drive disc (ドライブプレ-ト) is a member of a starter used to start an automobile engine, and it is provided with teeth on the peripheral wall of the outer peripheral portion of the disc-shaped chassis. Fig. 15 is a schematic cross-sectional view of a conventional drive disk. As shown in the figure, the existing drive disc has an integrated chassis 1 and a cylindrical part 2 that is about the same thickness as the chassis by drawing and forming on the outer peripheral part of the chassis 1; In the cylindrical peripheral wall member 4 of 3, two members are joined by welding 5 .

However, such a drive disc, even if the milling teeth 3 on the peripheral wall member 4 itself can obtain sufficient strength and wall thickness, is prone to defects caused by poor welding, and there are problems such as the need for an expensive automatic welding robot.

The present invention was made based on the above circumstances. The object of the present invention is to provide a method for thickening a plate metal part and its annular peripheral wall. The sheet metal is such that, as can be seen from the drive disc, in parts where the chassis is provided with an annular peripheral wall, the chassis and the annular peripheral wall are integrated and can be directly milled without the annular peripheral wall being insufficient in strength.

In order to achieve the above object, the sheet metal part of the present invention integrates the bottom and the annular peripheral wall extending vertically from the outer peripheral side of the chassis, and the annular peripheral wall is thickened to more than 2 times or 3 times the thickness of the chassis.

That is, the sheet metal part of the present invention, due to the success of the thickening method described later, can thicken the above-mentioned annular peripheral wall to become an unimaginable thickness of more than 2 times or more than 3 times so far, so that it can be used in the existing drive disc The teeth milled on the peripheral wall parts can be directly milled with teeth outside the above-mentioned annular peripheral wall. Therefore, the two processes in the existing drive disk production, namely the process of inserting the metal plate cylindrical part 2 into the milled peripheral wall part 4 and the process of welding the peripheral wall part 4 and the cylindrical part 2, can not be carried out. In addition, the chassis can be made of a thinner metal plate than the annular peripheral wall, so there will be no problems of increased weight and high material costs.

The above-mentioned annular peripheral wall is more than 2 times, the method of 3 times more ground thickening is that the above-mentioned chassis in the disc-shaped material with the chassis and the hat-shaped part integrally formed on its outside is kept on the rotating upper mold and the rotating lower mold. Between the moulds, the above-mentioned hat-shaped part protruding from the outside of the rotary lower die and the rotary upper die is pushed radially inward with the above-mentioned annular forming surfaces of various rotating pressure rollers provided with concave annular forming surfaces, and the The inner side of the hat-shaped part is thickened in order, and the thickened hat-shaped part is made into a cylindrical shape concentric with the chassis to form a thickened annular peripheral wall. In this way, the annular peripheral wall can be thickened, It becomes twice or more than three times the wall thickness of the chassis.

A brief description of the attached drawings:

Figure 1: Explanatory diagram of the deep drawing process of a round metal sheet.

Figure 2: An explanatory diagram of the initial stage in which the hat-shaped part formed through the drawing process gradually becomes thicker.

Figure 3: Explanatory diagram of the intermediate stage of the process of gradually thickening the hat-shaped part.

Fig. 4: An explanatory diagram of other intermediate stages in the process of gradually thickening the hat-shaped portion.

Figure 5: Explanatory diagram of the final stage of the process of gradually thickening the hat-shaped part.

FIG. 6 : Explanatory drawing of the annular peripheral wall forming process.

Figure 7: Partial sectional view showing the correct shape of the part obtained through the drawing process.

Figure 8: Partial sectional view showing the correct shape of the part obtained through the stages of Figure 2.

FIG. 9 : Cutaway sectional view showing the correct shape of the part obtained through the stages of FIG. 3 .

Figure 10: Partial sectional view showing the correct shape of the part obtained through the stages of Figure 4 .

FIG. 11 : A sectional view showing the correct shape of the part obtained through the stages of FIG. 5 .

FIG. 12 : A cross-sectional view showing the correct shape of the part obtained through the stages of FIG. 6 .

Fig. 13: A front view of a driving disk as an example of a sheet metal member provided with an annular peripheral wall in the embodiment.

Fig. 14: A sectional view along line XIV-XIV of Fig. 13 .

Fig. 15: A schematic cross-sectional view of an existing drive disc.

Example:

Figures 1 to 6 show an embodiment in which a thin-walled disk-shaped material made of a steel plate as a sheet metal material is made into a driving disk for an automobile engine starter by using the method for thickening the annular peripheral wall of the present invention. The thickness t1 of the disk-shaped material 11 used as a raw material is 2 mm, and the method of thickening the annular circumference of the present invention was used for the disk-shaped material 11 . The disc-shaped material 11 is provided with a chassis 12 and a hat-shaped part 13 formed integrally on its outer side, and the hat-shaped part 13 and the chassis 12 can be connected flatly or through a stepped part. As shown in FIG. 1 , the flat disc-shaped material 11 fixed on the lower die 31 is stamped with an upper die 32 , and the disc-shaped material 11 is deep-drawn. The disc-shaped material 11 thus formed, that is, the disc-shaped material 11 having a base plate 12 and a hat-shaped portion 13 formed at the base plate 12 by a stepped portion 14 is used in this embodiment.

In the drawing process of FIG. 1, the hat-shaped portion 13 is slightly inclined downward. As shown in the figure, the included angle between the chassis 12 and the hat-shaped portion 13 is represented by the symbol θ1, for example, the inclination angle θ1 is 5 degrees. In addition, at the same time as the drawing process of FIG. 1 is performed, a circular hole 15 pierced by punching is opened in the center of the chassis 12 . Reference numeral 16 is the scrap generated by the punching process.

Fig. 2-Fig. 5 shows that the above-mentioned disk-shaped material 11 is kept between the rotary lower die 33 and the rotary upper die 34, and the above-mentioned hat-shaped part is gradually thickened with various rotary rollers 35-38. stage.

形状。即在图2的阶段，帽边形部分13被成形面42的上接触面39向下方推压，帽边形部分13倾斜到对底盘12的倾斜角为θ2为止。在这里，倾斜角θ2比图1所示的倾斜角度θ1大。例如该倾斜角是21度。在这一阶段，通过越往里越窄的环形成形面42的作用，帽边形部分13在其里侧凸起(换句话说，材料在里面侧发生塑性流动)厚壁化到厚度为t2为止(t2＞t1)。The rotary press roller 35 used in the process of Fig. 2 is provided with a concave annular forming surface 42, and the annular forming surface 42 is also provided with an upper contact surface 39 inclined upwards at an angle of θ2 toward the outside and a lower contact surface inclined slightly downwards toward the outside. Face 41. While rotating lower die 33, rotating upper die 34, and the above-mentioned hat-shaped part 13 extending outside the rotating upper die 34 rotates, use the above-mentioned rotating roller 35 to move horizontally in the direction shown by arrow a in Fig. 2 The ring-forming surface 42 pushes radially inward; the section of the hat-shaped portion 13 is roughly

shape. That is, at the stage of FIG. 2 , the hat-shaped portion 13 is pushed downward by the upper contact surface 39 of the forming surface 42 , and the hat-shaped portion 13 is inclined until the inclination angle to the chassis 12 is θ2. Here, the inclination angle θ2 is larger than the inclination angle θ1 shown in FIG. 1 . For example, the inclination angle is 21 degrees. At this stage, through the action of the annular forming surface 42 that becomes narrower and narrower inward, the hat-shaped portion 13 protrudes on its inner side (in other words, the material flows plastically on the inner side) and thickens to a thickness of t2 until (t2>t1).

The rotary press roll 36 used in the process of FIG. 3 is provided with a concave annular forming surface 45 . The annular forming surface 45 is provided with an upper contact surface 43 inclined upward toward the outside at an angle θ3 and a lower contact surface 44 inclined downward toward the outside. The above-mentioned hat-shaped part 13 that has passed through the stage of Fig. 2 and the outer peripheral part has been thickened 3 is rotated by the two molds 33, 34, and is simultaneously subjected to the annular forming surface 45 of the above-mentioned rotating press roller 36 that moves horizontally in the direction shown by arrow b in Fig. 3 Pushing radially inwardly, the cross-sectional view of the outer peripheral portion of the above-mentioned hat-shaped portion 13 is generally shape. That is, at the stage of FIG. 3 , the lower surface of the hat-shaped portion 13 is pushed upward by the lower contact surface 44 of the forming surface 45 , and the hat-shaped portion 13 is inclined to the position where the inclination angle to the chassis 12 is θ3. Here, the inclination angle θ3 is smaller than θ2 shown in FIG. 2 . For example, this inclination angle θ3 is 5 degrees. At this stage, only the inclination angle of the hat-shaped portion 13 changes from θ2 to θ3, and the thickening of the hat-shaped portion 13 does not proceed substantially. Therefore, the wall thickness t3 of the outer peripheral portion of the hat-shaped portion 13 does not substantially change from the stage of FIG. 2 (t3=t2).

形状。即在图4的阶段，帽边形部分13被成形面48的上接触面46向下方推，帽边形部分倾斜到相对底盘12的倾斜角为θ4的位置。在这里，倾斜角θ4比图3所示的倾斜角θ3大。例如这倾斜角度θ4是10度。且在这阶段通过越往里越窄的环形成形面48的推压作用，帽边形部分13已经厚壁化的外周部分进一步向里侧凸起(换句话说，在里面侧材料发生塑性流动)厚壁化到厚度t4(t4＞t3)。The rotary pressing roll 37 used in the process of FIG. 4 is provided with a concave annular forming surface 48 . The annular forming surface 48 is provided with an upper contact surface 46 facing outwards and upwards with an inclination angle of θ4 and a lower contacting surface 47 sloping outwards and downwards. And be that the above-mentioned cap-shaped part 13 that the angle of inclination of Fig. 3 stage is θ 3 is rotated by two dies 33,34, is subjected to the annular forming surface 48 of the above-mentioned rotating pressing roller 37 that moves horizontally to the direction shown by arrow C in Fig. 4 simultaneously Pushing radially inside, the cross-section of above-mentioned cap-shaped part 13 is roughly

shape. That is, at the stage of FIG. 4 , the hat-shaped portion 13 is pushed downward by the upper contact surface 46 of the forming surface 48 , and the hat-shaped portion is inclined to a position where the inclination angle relative to the chassis 12 is θ4. Here, the inclination angle θ4 is larger than the inclination angle θ3 shown in FIG. 3 . For example, the inclination angle θ4 is 10 degrees. And at this stage, through the pushing action of the annular forming surface 48 that becomes narrower and narrower inward, the thickened outer peripheral portion of the cap-shaped portion 13 is further protruded inward (in other words, plastic flow of the material on the inner side occurs). ) thickened to a thickness of t4 (t4>t3).

形的块状。The rotary press roll 38 for the process of FIG. 5 is provided with a concave annular forming surface 52 . The ring-shaped forming surface 52 is also provided with an upper contact surface 49 inclined outward and upward at an inclination angle θ5 and a lower contact surface 51 slightly inclined outward and downward. Through the inclination angle of Fig. 4 stage, be the above-mentioned hat-shaped part 13 of θ 4 by two molds 33,34 rotation, be subjected to the annular forming surface 52 of the above-mentioned rotating pressing roller 38 moving horizontally to the direction shown by the arrow in Fig. 5 to radial direction simultaneously Pushing the inner side, the cross section of the above-mentioned hat-shaped portion 13 is generally formed as shape. That is, at the stage of FIG. 5 , the outer peripheral portion of the hat-shaped portion 13 is pushed up by the lower contact surface 51 of the forming surface 52, and the hat-shaped portion 13 is inclined to a position where the inclination angle relative to the chassis is θ5. Here, the inclination angle θ5 is smaller than the inclination angle θ4 shown in FIG. 4 . For example, this inclination angle θ5 is 5 degrees. And at this stage, the outer peripheral portion of the hat-shaped portion 13, which has been thickened to a considerable extent, is further pushed by the annular forming surface 52, and further protrudes toward the inner side (in other words, plastic flow of the material on the inner side occurs) further. Thickening. In this stage of thickening, the hat-shaped portion 13 protruding from the chassis is substantially all thickened to the thickness t5 (t5>t4). As shown in Figure 5, the profile is generally formed as

shaped blocks.

The hat-shaped portion 13 that has been thickened at various stages illustrated in FIGS. It is more than 3 times of the wall thickness of the chassis 12.

形状(外周面和内周面光滑)的环形周壁17。FIG. 6 is the final stage of each stage described in FIGS. 2 to 5 , that is, a process of forming the thickened hat-shaped portion 13 into a predetermined cross-sectional shape after the stage of FIG. 5 . In this process, the hat-shaped portion 13 is further thickened. That is, a rotary press roll 53 provided with a concave ring-shaped forming surface 54 forming the outer shape of the peripheral wall is used in this process. The hat-shaped part 13 and the two molds 33, 34 rotate together through the stage of Fig. 5, and are simultaneously pushed radially inward by the annular forming surface 54 of the above-mentioned rotating roller 53 moving horizontally in the direction shown by the arrow e in Fig. 6 , the above-mentioned hat-shaped portion 13 is formed in a cylindrical shape concentric with the chassis 12, forming a cross section into

Shaped (outer and inner peripheral surfaces are smooth) annular peripheral wall 17 .

In the embodiment illustrated in FIGS. 1 to 6 , the final thickened annular peripheral wall 17 has a thickness of about 7 mm, and the annular peripheral wall 17 can be formed to be 3.5 times thicker than the chassis 12 (with a thickness of 2 mm). By changing the setting conditions such as the angles of the annular forming surfaces 42, 45, 48, 52, 54 of the rotating rollers 35, 36, 37, 38, 53, the wall thickness of the annular peripheral wall 17 can be set to the thickness of the chassis 12. Less than 3.5 times (eg 2 times, 3 times) or more than 3.5 times.

7 to 12 are partial cross-sectional views showing correct shapes of components obtained through the respective stages or processes described in FIGS. 1 to 6 . That is, Fig. 7 is a partial cross-sectional view showing the correct shape of the disc material 11 obtained through the drawing process of Fig. 1, Fig. 8 is a partial cross-sectional view showing the correct shape of the parts obtained through the stage of Fig. 2, and Fig. 9 is a partial cross-sectional view showing A partial cross-sectional view of the correct shape of the part obtained through the stage of Fig. 3, Fig. 10 is a partial cross-sectional view showing the correct shape of the part obtained through the stage of Fig. 4, and Fig. 11 is a partial cross-sectional view showing the correct shape of the part obtained through the stage of Fig. 5 Partial sectional view, FIG. 12 is a partial sectional view showing the correct shape of the part obtained through the stages of FIG. 6 . As can be seen from these figures, the thickness dimension of the hat-shaped portion 13 that can actually be used as the annular peripheral wall 17 is more than three times the thickness dimension of the chassis 12, that is, the thickness dimension of the disc-shaped material 11 as a raw material.

FIG. 13 shows an example of a sheet metal member provided with an annular peripheral wall, and shows a front view of a drive disk 61 used in a starter for starting an automobile engine. Fig. 14 is a sectional view taken along line XIV-XIV in Fig. 13 . In this driving disc 61, the annular peripheral wall 17 integrally provided with the chassis 12 extending vertically from the outer peripheral side of the annular peripheral wall 17 is related to the wall thickness of the disc-shaped material 11 as a raw material, but by the above method Thickened to more than 2 times, better more than 3 times, preferably more than 3.5 times, the outer peripheral surface of the annular peripheral wall 17 is milled with teeth 62, and there is no welding place in the driving disc 61. Due to the thickening of the annular peripheral wall 17 , the outer peripheral surface has the strength for milling teeth 62 . 63 is a mounting hole.

According to the sheet metal part provided with the annular peripheral wall and the method for thickening the annular peripheral wall thereof according to the present invention, the annular peripheral wall integrated with the chassis is thickened to the degree of more than 2 times or more than 3 times the thickness of the chassis, so by, for example, The outer peripheral surface of the thickened annular peripheral wall is milled to make a driving disc. In addition, welding is not required at this time, and there is no problem of increased weight or high material cost. Therefore, it is especially useful where it is desired to eliminate welding and reduce costs.

Claims (1)

1. the wall thickening method of metal sheet annular perisporium, to have the chassis and remain between rotation counterdie and the rotation patrix on the above-mentioned chassis that this chassis outer circumferential side is wholely set the disc material of hat brim shape part, overhanging above-mentioned hat brim shape in the rotation counterdie and the rotation patrix outside is partly pushed to radially inner side successively with the rotation nip drum of a plurality of kinds, rotate the annular forming face that nip drums are provided with by these, the inboard of this hat brim shape part wall thickening in order, and this wall thickening hat brim shape partly make the tubular concentric with the chassis, form by the annular perisporium of wall thickening.

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