Variable-height outer rib member development rotary extrusion forming device and manufacturing method

Abstract

A spin extrusion forming apparatus and manufacturing method for unequal-height external rib members includes: a mandrel with a stepped structure and a cylindrical blank disposed outside it, wherein: a supplementary ring is provided between the cylindrical blank and the mandrel, and a limiting sleeve, a roller mechanism, and a pressure cap are respectively provided on the outside of the cylindrical blank from top to bottom, the limiting sleeve being interference-fitted with the cylindrical blank and the mandrel respectively, and the pressure cap being fixedly connected to the mandrel. This invention draws on the gear generating principle, using rollers with longitudinal and transverse ribs as cutting tools, and combining the generating motion between the rollers and the blank with the radial motion of the rollers to process the blank into a cylindrical blank and then into a thin-walled cylindrical part with unequal-height external ribs through two sets of rollers sequentially.

Description

Technical Field

[0001] This invention relates to a technology in the field of metal plastic processing, specifically a spin forming apparatus and manufacturing method for generating unequal-height external rib components. Background Technology

[0002] The existing manufacturing method for ribbed thin-walled cylindrical parts is integral plastic forming technology, mainly divided into two methods: spin forming and extrusion forming. However, it can generally only manufacture thin-walled cylindrical parts with equal-height ribs. For thin-walled cylindrical parts with unequal-height reinforcing ribs, since the required material volume is different at the high and low rib positions, common plastic forming methods cannot accurately meet the material flow requirements at each position. The proposed multi-level rib radial extrusion method can only process cylindrical blanks into components with equal-height ribs, or process preforms with equal-height external longitudinal ribs into cylindrical parts with unequal-height external longitudinal ribs. It cannot complete the direct forming of cylindrical blanks into components with unequal-height external ribs. Summary of the Invention

[0003] This invention addresses the problem of forming unequal-height longitudinal ribs, which cannot be solved by existing technologies. It proposes a generating spin extrusion forming device and manufacturing method for unequal-height external rib components. Drawing on the gear generating principle, the invention uses rollers with longitudinal and transverse rib grooves as cutting tools. By combining the generating motion between the rollers and the blank with the radial motion of the rollers, the blank is processed into a thin-walled cylindrical part with unequal-height external ribs by two sets of rollers in sequence.

[0004] This invention is achieved through the following technical solution:

[0005] This invention relates to a spin forming device for unequal height external ribbed cylindrical bodies, comprising: a mandrel with a stepped structure and a cylindrical blank disposed thereoutside thereon, wherein: a supplementary ring is provided between the cylindrical blank and the mandrel, and a limiting sleeve, a roller mechanism and a pressure cap are respectively provided outside the cylindrical blank from top to bottom, the limiting sleeve is interference-fitted with the cylindrical blank and the mandrel respectively, and the pressure cap is fixedly connected to the mandrel.

[0006] The roller mechanism consists of a pair of rollers with identical structures and equal heights. The initial roller group comprises two identical initial rollers, each with axial and circumferential grooves of equal height on its outer surface. The number of axial grooves is the same as the number of longitudinal ribs in the reinforced member, and the number of circumferential grooves is the same as the number of transverse ribs in the reinforced member. The high-low roller group comprises two identical high-low rollers, each with axial grooves and circumferential grooves of unequal height on its outer surface. The number of deep axial grooves is the same as the number of longitudinal ribs in the reinforced member, the number of shallow axial grooves is the same as the number of low longitudinal ribs in the reinforced member, and the number of circumferential grooves is the same as the number of transverse ribs in the reinforced member.

[0007] This invention relates to a manufacturing method for generating and spinning unequal-height external rib components based on the aforementioned device. The method involves constraining the cylindrical blank axially and circumferentially through toothed structures on the mandrel and gland, and radially constraining the cylindrical blank through supplementary rings, limiting sleeves, and annular structures on the gland. The mandrel then drives the cylindrical blank to rotate counterclockwise at an angular velocity ω1, while the initial roller rotates clockwise at an angular velocity ω2 and simultaneously moves radially at a velocity v, forming a portion of the high longitudinal ribs and transverse ribs on the cylindrical blank. Finally, the initial roller is replaced with high-low rollers, and the mandrel and rollers move in the same manner as in the previous step, forming a low longitudinal rib on the cylindrical blank and further increasing the height of the high longitudinal ribs and transverse ribs, thus achieving the manufacturing of unequal-height external longitudinal rib components.

[0008] The ω1 and ω2 satisfy: Where Z1 is the design number of teeth for the ribbed component, and Z2 is the design number of teeth for the roller.

[0009] Technical effect

[0010] This invention constrains the axial, circumferential, and partially radial directions of the cylindrical blank, utilizing the generating motion between the double rollers and the cylindrical blank to form a high-low outer rib structure through loading on two sets of rollers with different lines, achieving multi-pass small-feed processing. Compared to existing spinning and extrusion forming methods that can only manufacture outer transverse rib structures of varying heights or can only complete the manufacturing of components with equal-height ribs to components with unequal-height outer longitudinal ribs, this invention, through the distribution design of factors such as the depth and number of rib grooves in the two roller sets, can complete the manufacturing directly from a cylindrical blank to a cylindrical body with unequal-height outer longitudinal ribs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the first processing step of the present invention;

[0012] Figure 2 This is a cross-sectional view of the second processing step of the present invention;

[0013] Figure 3 This is an exploded view of the second processing step of the present invention;

[0014] Figure 4 This is a schematic diagram of the gland structure;

[0015] Figure 5 This is a schematic diagram of the initial roller structure in Example 1;

[0016] Figure 6 This is a top view of the high and low rollers in Example 1;

[0017] Figure 7 This is a schematic diagram of the high and low roller structure in Example 1;

[0018] Figure 8 This is a schematic diagram of the initial roller structure in Example 3;

[0019] Figure 9 This is a schematic diagram of the high and low roller structure in Example 3;

[0020] Figure 10 This is a diagram illustrating the structural changes of the cylindrical blank in Example 1.

[0021] Figure 11 This is a diagram illustrating the structural changes of the cylindrical blank in Example 2.

[0022] Figure 12 This is a diagram illustrating the structural changes of the cylindrical blank in Example 3.

[0023] In the diagram: 1. Mandrel; 2. Limiting sleeve; 3. Pressure cap; 4. Initial roller; 5. Cylindrical blank; 6. Supplementary ring; 7. High and low rollers. Specific implementation methods

[0024] Example 1

[0025] like Figures 1 to 7 As shown, this embodiment relates to a spin forming device for generating unequal-height external rib members, which includes: a mandrel 1 with a stepped structure and a cylindrical blank 5 disposed outside it, wherein: a supplementary ring 6 is provided between the cylindrical blank 5 and the mandrel 1, and a limiting sleeve 2, a roller mechanism and a pressure cap 3 are respectively provided outside the cylindrical blank 5 from top to bottom, the limiting sleeve 2 is interference-fitted with the cylindrical blank 5 and the mandrel 1 respectively, and the pressure cap 3 is fixedly connected to the mandrel 1.

[0026] like Figures 5-9 As shown, the roller mechanism consists of a pair of rollers 4 and 7 with the same height and structure. The initial roller 4 includes 8 shallow longitudinal rib grooves and at least 1 transverse rib groove, while the high and low rollers 7 include 8 deep longitudinal rib grooves, at least 16 shallow longitudinal rib grooves, and at least 1 transverse rib groove.

[0027] like Figure 2 , Figure 3 As shown, the mandrel 1 and the supplementary ring 6 are respectively provided with toothed structures on their horizontal contact surfaces for meshing.

[0028] The pressure cap 3 is connected to the spindle 1 by 6 bolts.

[0029] The cylindrical blank 5 is a thin-walled cylindrical short shell structure. The cylindrical blank 5 is divided into a contact area in the middle and an extended area on both sides in the axial direction. The contact area is the part where the cylindrical blank 5 contacts the roller group 4 and 7, and the rest is the extended area.

[0030] like Figure 2 , Figure 3 As shown, the pressure cap 3 has a toothed structure inside and the central cylinder of the mandrel 1 has a toothed structure, which is used to constrain the circumferential and axial directions of the blank 5 to prevent relative sliding between the blank 5 and the mandrel 1 and the supplementary ring 6 during the processing.

[0031] The annular structure at the front end of the pressure cap 3 is in an interference fit with the extended region of the cylindrical blank 5, and the limiting sleeve 2 is in an interference fit with the extended region of the cylindrical blank 5. This is used to constrain the upper and lower extended regions of the cylindrical blank 5 radially to prevent the cylindrical blank 5 from expanding in diameter during processing.

[0032] like Figure 10 As shown, this embodiment relates to a manufacturing method for generating and spinning ribs with unequal height external ribs based on the above-mentioned device. The specific steps include:

[0033] 1) The supplementary ring 6 is placed at the end of the mandrel 1 to match the inner diameter of the cylindrical blank 5; the assembled mandrel 1 and supplementary ring 6 are inserted into the center of the cylindrical blank 5; the limiting sleeve 2 is placed on the outside of the cylindrical blank 5; the pressure cap 3 is fixed to the mandrel 1 with bolts to achieve axial, circumferential and partial radial constraints on the cylindrical blank 5. The upper surface of the initial roller 4 is coplanar with the lower surface of the limiting sleeve 2, and the included angle between the two initial rollers 4 is 180°.

[0034] 2) The mandrel 1 drives the cylindrical blank 5 to rotate counterclockwise at an angular velocity of ω1, while the two initial rollers 4 rotate clockwise at an angular velocity of ω2 and move radially toward the cylindrical blank 5 at a velocity v. ω1 and ω2 strictly satisfy the transmission ratio of the generating motion relationship, gradually forming corresponding short longitudinal ribs and short transverse ribs on the surface of the cylindrical blank 5, such as... Figure 10 As shown in (b).

[0035] 3) Replace the initial roller 4 with high and low rollers 7. The mandrel 1 drives the cylindrical blank 5 to rotate counterclockwise at an angular velocity of ω1. The two high and low rollers 7 rotate clockwise at an angular velocity of ω2 and move radially toward the cylindrical blank 5 at a velocity v. In this processing step, the radial distance of the high and low rollers 7 is greater than the radial distance of the initial roller 4 in the previous step. Gradually, the 8 short longitudinal ribs on the surface of the cylindrical blank 5 are formed into high longitudinal ribs, and the 1 short transverse rib is formed into a high transverse rib. At the same time, the corresponding short longitudinal ribs are formed on the surface of the cylindrical blank 5, such as... Figure 10 As shown in (c).

[0036] This method is not limited to processing such as Figure 10 For the component with longitudinal and transverse ribs shown in (c), the component with only unequal height outer longitudinal ribs can still be processed using the manufacturing method of developing and spinning the component with unequal height outer ribs.

[0037] Example 2

[0038] In this embodiment, a supplementary ring 6 with a smaller outer diameter and a cylindrical blank 5 with a smaller inner diameter are selected. The outer diameter of the supplementary ring 6 is equal to the inner diameter of the cylindrical blank, which is used to form a thin-walled cylindrical part with a larger wall thickness.

[0039] like Figure 11As shown, this embodiment relates to a manufacturing method for generating and spinning ribs with unequal height external reinforcement members, the specific steps of which include:

[0040] 1) The supplementary ring 6 is placed at the end of the mandrel 1 to match the inner diameter of the cylindrical blank 5; the assembled mandrel 1 and supplementary ring 6 are inserted into the center of the cylindrical blank 5; the limiting sleeve 2 is placed on the outside of the cylindrical blank 5; the pressure cap 3 is fixed to the mandrel 1 with bolts to achieve axial, circumferential and partial radial constraints on the cylindrical blank 5. The upper surface of the initial roller 4 is coplanar with the lower surface of the limiting sleeve 2, and the included angle between the two initial rollers 4 is 180°.

[0041] 2) The mandrel 1 drives the cylindrical blank 5 to rotate counterclockwise at an angular velocity of ω1, while the two initial rollers 4 rotate clockwise at an angular velocity of ω2 and move radially toward the cylindrical blank 5 at a velocity v. ω1 and ω2 strictly satisfy the transmission ratio of the generating motion relationship, gradually forming eight short longitudinal ribs parallel to the axis and one short transverse rib in the circumferential direction on the surface of the cylindrical blank 5, such as... Figure 11 As shown in (b).

[0042] 3) Replace the initial roller 4 with high and low rollers 7. The mandrel 1 drives the cylindrical blank 5 to rotate counterclockwise at an angular velocity of ω1. The two high and low rollers 7 rotate clockwise at an angular velocity of ω2 and move radially toward the cylindrical blank 5 at a velocity v. In this processing step, the radial distance of the high and low rollers 7 is greater than the radial distance of the initial roller 4 in the previous step. Gradually, the 8 short longitudinal ribs on the surface of the cylindrical blank 5 are formed into high longitudinal ribs, and the 1 short transverse rib is formed into a high transverse rib. At the same time, 16 short longitudinal ribs are formed on the surface of the cylindrical blank 5, such as... Figure 11 As shown in (c).

[0043] Example 3

[0044] Unlike Example 2, such as Figures 8 to 9 As shown, the initial roller selected in this embodiment includes 8 shallow longitudinal rib grooves and 2 transverse rib grooves, while the high and low rollers include 8 deep longitudinal rib grooves, 24 shallow longitudinal rib grooves, and 2 transverse rib grooves.

[0045] like Figure 12 As shown, this embodiment relates to a manufacturing method for generating and spinning ribs with unequal height external reinforcement members, the specific steps of which include:

[0046] 1) The supplementary ring 6 is placed at the end of the mandrel 1 to match the inner diameter of the cylindrical blank 5; the assembled mandrel 1 and supplementary ring 6 are inserted into the center of the cylindrical blank 5; the limiting sleeve 2 is placed on the outside of the cylindrical blank 5; the pressure cap 3 is fixed to the mandrel 1 with bolts to achieve axial, circumferential and partial radial constraints on the cylindrical blank 5. The upper surface of the initial roller 4 is coplanar with the lower surface of the limiting sleeve 2, and the included angle between the two initial rollers 4 is 180°.

[0047] 2) The mandrel 1 drives the cylindrical blank 5 to rotate counterclockwise at an angular velocity of ω1, while the two initial rollers 4 rotate clockwise at an angular velocity of ω2 and move radially toward the cylindrical blank 5 at a velocity v. ω1 and ω2 strictly satisfy the transmission ratio of the generating motion relationship, gradually forming 8 short longitudinal ribs parallel to the axis and 2 short transverse ribs in the circumferential direction on the surface of the cylindrical blank 5, such as... Figure 12 As shown in (b).

[0048] 3) Replace the initial roller 4 with high and low rollers 7. The mandrel 1 drives the cylindrical blank 5 to rotate counterclockwise at an angular velocity of ω1 at a speed of 40 rad / min. The two high and low rollers 7 rotate clockwise at an angular velocity of ω2 and move radially toward the cylindrical blank 5 at a speed of v. The radial feed speed of the rollers is 0.2 mm / r. During this process, the radial movement distance of the high and low rollers 7 is greater than that of the initial roller 4 in the previous step. Gradually, the 8 short longitudinal ribs on the surface of the cylindrical blank 5 are formed into 4.5 mm high longitudinal ribs, and the 2 short transverse ribs are formed into 4.5 mm high transverse ribs. At the same time, 24 2 mm short longitudinal ribs are formed on the surface of the cylindrical blank 5. Figure 12 As shown in (c), a cylindrical member with unequal height external longitudinal ribs is obtained.

[0049] Compared with existing technologies, this device can directly form cylindrical blanks into components with high and low ribs through the generating spin extrusion manufacturing method. By changing the number and distribution of deep and shallow longitudinal rib grooves on the rollers and the diameter of the supplementary ring, it can realize the manufacturing of components with different thicknesses and different distribution patterns of high and low ribs.

[0050] The above-described specific implementations can be partially adjusted by those skilled in the art in different ways without departing from the principles and purpose of the present invention. The scope of protection of the present invention is defined by the claims and is not limited to the above-described specific implementations. All implementation schemes within the scope of the claims are bound by the present invention.

Claims

1. A spin extrusion forming device for unequal-height external rib members, characterized in that, include: A mandrel with a stepped structure and a cylindrical blank disposed outside it, wherein: a supplementary ring is provided between the cylindrical blank and the mandrel, and a limiting sleeve, a roller mechanism and a pressure cap are respectively provided on the outside of the cylindrical blank from top to bottom; the limiting sleeve is interference-fitted with the cylindrical blank and the mandrel respectively, and the pressure cap is fixedly connected to the mandrel; The roller mechanism consists of a pair of rollers with the same structure and equal height, namely an initial roller group or a high-low roller group. The initial roller group includes two identical initial rollers, and the outer surface of the rollers is provided with axial grooves and circumferential grooves of equal height. The high-low roller group includes two identical high-low rollers, and the outer surface of the rollers is provided with axial grooves and circumferential grooves of unequal height.

2. The apparatus for generating and spinning ribbed members with unequal heights according to claim 1, characterized in that, The number of axial rib grooves of the initial roller is the same as the number of longitudinal ribs of the ribbed component, and the number of circumferential rib grooves is the same as the number of transverse ribs of the ribbed component. In the axial grooves of the high and low rollers, the number of deep axial grooves is the same as the number of high longitudinal ribs of the reinforced member, the number of shallow axial grooves is the same as the number of low longitudinal ribs of the reinforced member, and the number of circumferential grooves is the same as the number of transverse ribs of the reinforced member.

3. The apparatus for generating and spinning ribbed members with unequal heights according to claim 1, characterized in that, The mandrel and the supplementary ring are respectively provided with toothed structures on their horizontal contact surfaces for meshing.

4. The apparatus for generating and spinning ribbed members with unequal heights according to claim 1, characterized in that, The cylindrical blank is a thin-walled cylindrical short shell structure. The cylindrical blank is divided into a contact area in the middle and extended areas on both sides in the axial direction. The contact area is the part of the cylindrical blank that contacts the roller group, and the rest is the extended area. The annular structure at the front end of the pressure cap is interference-fitted with the extended region of the cylindrical blank, and the limiting sleeve is interference-fitted with the extended region of the cylindrical blank. This is used to constrain the upper and lower extended regions of the cylindrical blank to prevent the cylindrical blank from expanding in diameter during processing.

5. The spin forming apparatus for generating unequal-height external rib members according to claim 1, characterized in that, The gland has a toothed structure inside, and a toothed structure is provided on the central cylinder of the mandrel to constrain the circumferential and axial directions of the blank, so as to prevent relative sliding between the blank and the mandrel and the supplementary ring during the processing.

6. The apparatus for generating and spinning ribbed members with unequal heights according to claim 1, characterized in that, The roller mechanism consists of a pair of rollers with the same height and structure. The initial roller includes 8 shallow longitudinal rib grooves and at least 1 transverse rib groove, while the high and low rollers include 8 deep longitudinal rib grooves, at least 16 shallow longitudinal rib grooves, and at least 1 transverse rib groove.

7. A method for manufacturing a rotary extrusion of an unequal-height outer rib member based on the device described in any one of claims 1-6, characterized in that, The cylindrical blank is axially and circumferentially constrained by the toothed structures on the mandrel and the gland, and radially constrained by the annular structures on the supplementary ring, the limiting sleeve, and the gland; then the mandrel drives the cylindrical blank to... The roller rotates counterclockwise at an angular velocity of [value missing], with the initial roller [value missing]. Rotating clockwise at an angular velocity while simultaneously moving at a speed Radial motion is performed to form part of the high longitudinal ribs and transverse ribs in the cylindrical blank; finally, the initial roller is replaced with high and low rollers, and the mandrel and rollers move in the same way as in the previous step to form the low longitudinal ribs in the cylindrical blank, and further increase the height of the high longitudinal ribs and transverse ribs, thus realizing the manufacturing of the unequal height outer longitudinal rib component.

8. The manufacturing method of rotating extrusion forming unequal-height external reinforcement members according to claim 7, characterized in that, The aforementioned and satisfy: Where Z1 is the design number of teeth for the ribbed component, and Z2 is the design number of teeth for the roller.

9. The manufacturing method of rotating extrusion forming unequal-height external reinforcement members according to claim 7 or 8, characterized in that, specifically... include: 1) Place the supplementary ring at the end of the mandrel to match the inner diameter of the cylindrical blank; insert the assembled mandrel and supplementary ring into the center of the cylindrical blank; place the limiting sleeve on the outside of the cylindrical blank; use bolts to fix the gland to the mandrel to achieve axial, circumferential and partial radial constraints on the cylindrical blank; the upper surface of the initial roller is coplanar with the lower surface of the limiting sleeve, and the included angle between the two initial rollers is 180°; 2) The mandrel drives the cylindrical blank to begin... The angular velocity rotates counterclockwise, and the two initial rollers rotate at a speed of 100 rpm. Rotating clockwise at an angular velocity while simultaneously moving at a speed Moving radially toward the cylindrical blank, where and By strictly satisfying the transmission ratio of the generating motion relationship, the corresponding short longitudinal ribs and short transverse ribs are gradually formed on the surface of the cylindrical blank; 3) Replace the initial rollers with high and low rollers, and the mandrel drives the cylindrical blank to begin... The angular velocity rotates counterclockwise, and the two high and low rollers rotate at a speed of 100 rpm. Rotating clockwise at an angular velocity while simultaneously moving at a speed Moving radially toward the billet, in this processing step, the distance of radial movement of the high and low rollers is greater than the initial radial movement distance of the rollers in the previous step, gradually forming the short longitudinal ribs on the surface of the billet into high longitudinal ribs, and the short transverse ribs into high transverse ribs, while forming the corresponding short longitudinal ribs on the surface of the billet.

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