Device and manufacturing method for radially extruding and forming a cylinder body with unequal-height external ribs

Abstract

An unequal-height external rib cylinder radial extrusion forming device and method, comprising: upper and lower cover plates, and a plurality of follower dies, pressing blocks and inner mandrels with sector-shaped curved surface structures arranged on the same radius, wherein: the blank to be processed is located between the inner mandrel and the follower dies, the central angle of each follower die matches the spacing of the external longitudinal ribs of the blank to be processed, and the pressing blocks are arranged between adjacent follower dies. The present invention simultaneously manufactures unequal-height external ribs through integral forming technology, and there are no welds on the cylinder body, and the metal streamline is continuous, so the strength performance is excellent; and this method is synchronously radially extruded by a plurality of pressing blocks and formed at one time, with high processing efficiency and simple operation.

Description

Technical Field

[0001] The present invention relates to a technology in the field of metal plastic processing, specifically an unequal-height external rib cylinder radial extrusion forming device and manufacturing method. Background Art

[0002] With the development of fields such as aerospace, the lightweight requirements for thin-walled cylindrical parts with reinforcing ribs are continuously increasing. A new design of a cylinder structure with high and low ribs has emerged. The high and low rib cylinder structure sets high ribs in places with high strength requirements and low ribs in places with low strength requirements, saving material usage while ensuring structural strength and making the parts lightweight. At present, there are relatively mature solutions for cylindrical parts with equal-height internal and external ribs. However, for thin-walled cylindrical parts with unequal-height reinforcing ribs, due to the different heights of the ribs, more material flow is required at the high-rib places and less at the low-rib places. Common plastic processing methods are difficult to meet both of the above requirements at the same time. If the material flows too much, it will cause a large difference in wall thickness near the rib part. Therefore, there is an urgent need for a technology to process unequal-height external rib cylindrical parts using plastic forming methods at the present stage. Summary of the Invention

[0003] In view of the above deficiencies of the prior art, the present invention provides an unequal-height external rib cylinder radial extrusion forming device and method, which can simultaneously manufacture unequal-height external ribs through integral forming technology, and there is no weld seam on the cylinder, and the metal streamline is continuous, so the strength performance is excellent; and this method is synchronously radially extruded by multiple pressing blocks, formed at one time, with high processing efficiency and simple operation.

[0004] The present invention is realized through the following technical solutions:

[0005] The present invention relates to an unequal-height external rib cylinder radial extrusion forming device, including: upper and lower cover plates, and a plurality of follower molds, pressing blocks and inner mandrels with fan-shaped curved surface structures arranged on the same radius. Among them: the blank to be processed is located between the inner mandrel and the follower molds. The central angle of each follower mold matches the pitch of the external longitudinal ribs of the blank to be processed, and the pressing blocks are arranged between adjacent follower molds.

[0006] The upper and lower cover plates are respectively fixedly connected to the inner mandrel by bolts.

[0007] Preferably, a horizontal groove is provided on the inner surface of the follower mold, and the shape of the groove matches the shape of the external transverse ribs of the blank to be processed.

[0008] Clasps are provided at both ends of the follower mold, and radial grooves are provided on the corresponding upper and lower cover plates. The follower mold is movably arranged by sliding the clasps into the radial grooves of the upper cover plate and the lower cover plate.

[0009] Preferably, the two side surfaces of the briquette are not parallel to each other, that is, they have a draft angle.

[0010] The blank to be processed is a thin-walled cylindrical part with equal-height longitudinal and transverse external ribs.

[0011] The present invention relates to a manufacturing method for radial extrusion forming of a cylindrical body with unequal-height external ribs. First, an inner mandrel is arranged at the center of the blank to be processed, and the upper cover plate and the lower cover plate are fixed to perform radial constraint and axial constraint on the blank to be processed; secondly, the follower die is in interference fit with the T-shaped grooves of the upper cover plate and the lower cover plate through T-shaped buckles to perform circumferential constraint on the blank; then all the briquettes synchronously perform radial extrusion on the low-rib position of the blank, and the excess material flows towards the wall plate of the blank, and the follower die performs passive radial movement as the thickness of the wall plate increases, realizing the radial extrusion forming of the cylindrical body with unequal-height external ribs.

[0012] Technical effects

[0013] Compared with the prior art, the present invention can enable multiple briquettes to perform radial extrusion simultaneously, and can realize the high-efficiency forming and manufacturing of a cylindrical body with unequal-height external ribs. At the same time, through flexible processing, only by changing the number of briquettes and the pressing amount, a cylindrical body with unequal-height external ribs with different height differences and different height distribution laws can be obtained, which can meet a wider range of applications. Brief description of the drawings

[0014] Figure 1 It is a schematic structural diagram of the present invention;

[0015] Figure 2 It is an exploded view of the present invention;

[0016] Figure 3 It is a schematic structural diagram of the follower die;

[0017] Figure 4 It is a schematic structural diagram of the upper top cover;

[0018] Figure 5 It is a radial extrusion process diagram of Example 2;

[0019] Figure 6 It is a radial extrusion process diagram of Example 3;

[0020] Figure 7 It is a radial extrusion process diagram of Example 4;

[0021] Figure 8 It is a schematic structural diagram of the blank before processing in Example 2;

[0022] Figure 9 It is a schematic structural diagram of the blank after processing in Example 2;

[0023] Figure 10 It is a schematic structural diagram of the blank before processing in Example 3;

[0024] Figure 11 Schematic diagram of the blank structure after processing in Example 3;

[0025] Figure 12 Schematic diagram of the blank structure before processing in Example 4;

[0026] Figure 13 Schematic diagram of the blank structure after processing in Example 4;

[0027] Figure 14 Schematic diagram of the structure of the follower die with a small width type in Example 4;

[0028] Figure 15 Schematic diagram of the structure of the follower die with a large width type in Example 4;

[0029] In the figure: upper cover plate 1, pressing block 2, follower die 3, lower cover plate 4, inner mandrel 5, blank 6, outer longitudinal ribs 7, outer transverse ribs 8. Detailed implementation manners

[0030] As Figure 1 and Figure 2 shown, this embodiment relates to a radial extrusion forming device for a cylinder with unequal-height outer ribs, including: upper and lower cover plates 1, 4, and a plurality of follower dies 3 and inner mandrels 5 with fan-shaped curved surface structures arranged on the same radius. Among them: the blank 6 to be processed is located between the inner mandrel 5 and the follower die 3, and a pressing block 2 is provided between adjacent follower dies 3.

[0031] The upper and lower cover plates 1, 4 are fixedly connected to the inner mandrel 5.

[0032] As Figure 3 shown, the central angle of each die is matched with the pitch of the outer longitudinal ribs 7 of the blank 6 to be processed; a horizontal groove is provided on the inner surface of the follower die 3, and the shape of the groove is matched with the shape of the outer transverse ribs 8 of the blank 6 to be processed.

[0033] Both ends of the follower die 3 are provided with buckles, and corresponding radial grooves are provided on the upper and lower cover plates 1, 4. The buckles are slidably inserted into the radial grooves of the upper cover plate 1 and the lower cover plate 4 to realize the movable setting of the follower die 3.

[0034] The buckles and the radial grooves are preferably of T-shaped structure.

[0035] Preferably, the number and positions of the pressing blocks 2 are matched with the number and positions of the short longitudinal ribs that the blank 6 to be processed needs to be processed into.

[0036] As Figure 5 shown, this embodiment relates to a manufacturing method for radial extrusion forming of a cylinder with unequal-height outer ribs based on the above device, specifically including:

[0037] 1) The inner shaft 5 is installed into the center of the blank 6, and the upper cover plate 1 and the lower cover plate 4 are fixed on the inner shaft 5 by bolts to achieve the axial constraint and radial constraint of the blank 6. Subsequently, 12 follower dies 3 are sequentially inserted into the corresponding T-shaped grooves of the upper cover plate 1 and the lower cover plate 4 through T-shaped buckles in a sliding manner until the three transverse grooves of the follower die 3 are perfectly fitted with the three transverse ribs of the blank 6, realizing the circumferential constraint of the blank 6.

[0038] 2) Eight pressure blocks 2 are simultaneously compressed radially. Under the action of the radial pressure of the pressure blocks 2 on the corresponding longitudinal ribs of the blank 6, the height of the longitudinal ribs begins to decrease, and the excess material of the longitudinal ribs gradually flows to the thin wall below the ribs, and the wall thickness of the thin wall gradually increases, and the follower die 3 gradually moves in the direction of radial expansion.

[0039] 3) When the eight pressure blocks 2 are radially compressed to a specified depth, they stop moving and start moving in the opposite direction, separating from the blank 6. The bolts are unscrewed, the upper cover plate 1 and the lower cover plate 4 are removed, and the inner shaft 5 is taken out to obtain an Figure 9 unequal-height outer-rib cylinder as shown.

[0040] As Figure 8 shown, the to-be-processed blank 6 of the cylinder structure prepared by the above method has 3 outer transverse ribs 8 in the circumferential direction and 12 narrow outer longitudinal ribs 7 in the axial direction on its outer surface.

[0041] For the blank 6 with only longitudinal ribs 7, the manufacturing method of radial extrusion forming of the unequal-height outer-rib cylinder can still be used for processing.

[0042] As Figure 10 shown, when the outer surface of the blank 6 has 3 outer transverse ribs 8 in the circumferential direction and 16 wide outer longitudinal ribs 7 in the axial direction, its preparation process is as Figure 6 shown, and an unequal-height outer-rib cylinder as shown in Figure 11 is obtained by 12 pressure blocks 2 using the same steps as above.

[0043] As Figure 12 shown, when the outer surface of the blank 6 has 3 outer transverse ribs 8 in the circumferential direction and 16 wide outer longitudinal ribs 7 in the axial direction, and the spacing of its longitudinal ribs consists of two types, large and small, its preparation process is as shown in Figure 7 shown. By using the follower dies 3 of two width forms as shown in Figure 14 and Figure 15 shown, that is, the large central angle and the small central angle, which are respectively installed between the two longitudinal ribs with smaller and larger spacing of the blank 6, and an unequal-height outer-rib cylinder as shown in Figure 13 is obtained by using the same steps as above.

[0044] As Figure 12As shown, the short ribs on both sides of the high ribs of the prepared outer rib cylinder with unequal heights are closer, so that the excess material of the short longitudinal ribs is evenly distributed at the thin-walled part during the radial extrusion forming process, and the wall thickness of the blank 6 after processing remains consistent.

[0045] Through the simulation of the radial extrusion processing process, set the moving speed of the pressing block to 5 mm / min and simulate the above process, and a cylindrical part with unequal-height outer ribs with a low rib of 10 mm and a high rib of 20 mm can be radially extruded and manufactured.

[0046] Compared with the existing forming manufacturing methods of outer rib cylinders, which are generally spinning forming and rotary extrusion forming. Spinning forming generally constrains the cylindrical blank in the circumferential and radial directions and forms the outer ribs through the movement of the spinning wheel; rotary extrusion forming generally uses a manufacturing method with one end fixed and the other end fed axially for rotary extrusion processing. The present invention uses a manufacturing method that fixes the axial, radial, and circumferential movements of the blank and uses pressing blocks to simultaneously extrude the outer ribs. Since several pressing blocks are simultaneously processed in the radial direction, under the condition of the same feed speed, the processing and manufacturing efficiency is greatly improved; in the existing rotary extrusion forming manufacturing method, by controlling the radial feed while the two ends of the spinning wheel are fed axially, only outer transverse ribs with different heights can be manufactured, while the present invention uses the method of simultaneous extrusion by pressing blocks and can complete the manufacturing of outer longitudinal rib cylinders with different heights through the follow-up constraint of the follow-up module.

[0047] The above specific implementation can be locally adjusted by those skilled in the art in different ways without departing from the principles and purposes of the present invention. The protection scope of the present invention is subject to the claims and is not limited by the above specific implementation, and all implementation solutions within its scope are subject to the constraints of the present invention.

Claims

1. A manufacturing method of a radial extrusion forming device for a cylindrical barrel with unequal-height external ribs, characterized in that, Including: 1) Install the inner core shaft into the center of the blank, and fix the upper cover plate and the lower cover plate on the inner core shaft with bolts to achieve axial restraint and radial restraint of the blank; then insert the block follower die into the corresponding T-shaped grooves of the upper cover plate and the lower cover plate through the T-shaped buckle in sequence until the three transverse grooves of the follower die are perfectly fitted with the three transverse ribs of the blank to achieve circumferential restraint of the blank; 2) Simultaneously compress the block pressing block radially. Under the action of the radial pressure of the pressing block on the corresponding longitudinal ribs of the blank, the height of the longitudinal ribs begins to decrease, and the excess material of the longitudinal ribs gradually flows to the thin wall below the ribs, and the wall thickness of the thin wall gradually increases, and the follower die gradually moves in the direction of radial expansion; 3) When the block pressing block is radially compressed to the specified depth, stop moving and start moving in the reverse direction, separate from the blank, unscrew the bolts, remove the upper cover plate and the lower cover plate, and take out the inner core shaft to obtain an unequal-height outer rib cylinder with circumferential outer transverse ribs and axial outer longitudinal ribs on the outer surface; The radial extrusion forming device includes: upper and lower cover plates, and a plurality of follower dies, pressing blocks and inner core shafts with fan-shaped curved surface structures arranged on the same radius, where: the blank to be processed is located between the inner core shaft and the follower die, and the central angle of each follower die matches the spacing of the outer longitudinal ribs of the blank to be processed, and the pressing block is arranged between two adjacent follower dies; The inner surface of the follower die is provided with a horizontal groove, and the shape of the groove matches the shape of the outer transverse rib of the blank to be processed; Both ends of the follower die are provided with buckles, and corresponding radial grooves are provided on the upper and lower cover plates, and the buckles are slidably inserted into the radial grooves of the upper and lower cover plates to realize the movable setting of the follower die.

2. The manufacturing method according to claim 1, characterized in that, Both the buckle and the radial groove are T-shaped structures.

3. The manufacturing method according to claim 1, characterized in that, The upper and lower cover plates are respectively fixedly connected to the inner core shaft with bolts.

4. The manufacturing method according to any one of claims 1-3, characterized in that, The inner surface of the follower die is provided with a horizontal groove, and the shape of the groove matches the shape of the outer transverse rib of the blank to be processed.

5. The manufacturing method according to claim 1, characterized in that, The two side surfaces of the pressing block are not parallel to each other, that is, there is a draft angle.

6. The manufacturing method according to claim 1, characterized in that, The blank to be processed is a thin-walled cylindrical part with equal-height longitudinal and transverse outer ribs.

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