Plum blossom pipe framework forming device

Abstract

The utility model relates to the field of aviation filter manufacturing, in particular to a plum blossom pipe framework forming device which comprises a base, an upper die assembly and a material returning assembly, a forming positioning hole is formed in the center of the base, positioning grooves evenly distributed around the center are formed in the bottom of the base, supporting pieces are installed in the positioning grooves, and idler wheels are arranged on one sides of the supporting pieces and distributed around the center of the base. The upper die assembly comprises an upper die plate and a mandrel, the upper end face of the upper die plate is connected with a press, the lower end face of the upper die plate is connected with the mandrel, the mandrel is provided with an arc-shaped protrusion along the axis, the section of the mandrel is quincunx-shaped, and the inner shape of the mandrel is the same as that of a to-be-formed quincunx pipe framework. The material returning assembly comprises a movable plate, an ejector rod is arranged at the upper end of the movable plate, the ejector rod is in sliding fit with holes in the two ends of the upper die plate and sleeved with a second spring, a through hole is formed in the center of the movable plate and communicated with an inner hole of a pressure sleeve connected to the lower end of the movable plate, and a mandrel penetrates through the through hole in the center of the movable plate and is in sliding fit with the inner hole of the pressure sleeve. The pressure sleeve is in sliding fit with the inner hole of the positioning sleeve.

Description

Technical Field

[0001] The utility model relates to the field of aviation filter manufacturing, in particular to the technical field of manufacturing a plum blossom tube skeleton in a filtering system, and in particular to a forming device which effectively improves the processing quality and manufacturing efficiency of the plum blossom tube skeleton. Background Art

[0002] In aerospace filter elements, the filter element skeleton components often adopt a cylindrical design to support the filter element, ensuring a certain degree of crush resistance. That is, when the fluid medium passes through the filter element and impacts the filter element corrugations, the cylindrical filter element skeleton supports the filter element corrugations with a certain degree of stiffness, preventing a sharp decline in filtration efficiency. As the operating pressure of aerospace filter elements continues to increase, the traditional method of increasing the thickness of the filter element skeleton and replacing it with high-strength materials has significantly increased the difficulty and cost of processing. Utility Model Content

[0003] The purpose of this utility model: In order to overcome the deficiencies in the background technology and solve the existing technical problems, the utility model discloses a plum blossom tube skeleton forming device that can improve the anti-flattening ability of the filter element skeleton by cold working hardening of the material without changing the thickness of the material, and has high molding efficiency, good precision control, stable and reliable quality, and can meet the needs of mass production.

[0004] Technical solution:

[0005] A plum blossom tube skeleton forming device comprises a cylindrical base, an upper mold assembly and a material stripping assembly, a forming positioning hole is provided in the center of the base, a positioning groove is provided at the bottom of the base and is evenly arranged around the center, a support member is installed in the positioning groove, a roller is provided on one side of the support member near the center, the roller is arranged around the center of the base, a positioning sleeve is provided on the top of the base, the positioning sleeve is coaxially arranged with the forming positioning hole, the upper mold assembly comprises an upper template and a core shaft, the upper end face of the upper template is connected to the upper workbench of the press, and the lower end face is connected to the core shaft, the core shaft is provided with an arc-shaped protrusion along the axis, the cross-section is plum blossom-shaped, and is the same as the inner surface of the plum blossom tube skeleton to be formed; the material stripping assembly comprises a movable plate, two symmetrical push rods are provided at the upper end of the movable plate, the push rods are slidably matched with the holes at both ends of the upper template, a spring 2 is sleeved on the push rod, a through hole is provided in the center of the movable plate, which is connected to the inner hole of the pressure sleeve connected to the lower end of the movable plate, the core shaft passes through the through hole in the center of the movable plate and slides with the inner hole of the pressure sleeve, and the outer diameter of the pressure sleeve slides with the inner hole of the positioning sleeve.

[0006] Furthermore, a support member positioning hole is provided on one side of the support member close to the center, and the roller is installed in the support member positioning hole through a small shaft and a nut.

[0007] Furthermore, the support member is installed in the positioning groove of the base through pins and long screws.

[0008] Furthermore, the positioning sleeve is arranged in the mounting hole at the top of the base, a slot is provided on the outer circular surface of the positioning sleeve, and a key is provided on the inner circular surface of the mounting hole at the top of the base. The key slot cooperates to prevent the positioning sleeve from rotating in the mounting hole at the top of the base.

[0009] Furthermore, the positioning sleeve has multiple radial positioning holes arranged along the radial direction, and the radial positioning holes are arranged around the center of the positioning sleeve. A steel ball and a spring are set in the radial positioning hole. The steel ball is close to the inner hole of the positioning sleeve. One end of the spring presses the steel ball, and the other end contacts the screw plug set in the radial positioning hole.

[0010] Furthermore, the diameter of the steel ball is larger than the diameter of the radial positioning hole on the side close to the inner hole of the positioning sleeve, ensuring that the steel ball will not fall out of the radial positioning hole.

[0011] Furthermore, the pressure sleeve is fixed at the center of the lower end of the movable plate through the pressure sleeve fixing plate and screws; the core shaft is fixed at the center of the lower end of the upper template through the core shaft fixing plate and screws, and the core shaft and the core shaft fixing plate are relatively vertical when installed.

[0012] Furthermore, the lower end of the core shaft is a smoothly transitioned conical structure with a taper of 10°.

[0013] Beneficial effects:

[0014] The utility model proposes a plum blossom tube skeleton processing device which can improve the anti-flattening ability of the filter element skeleton by cold working hardening of the material without changing the thickness of the material. Compared with the traditional method of "increasing the thickness of the filter element skeleton and replacing high-strength materials", the device has the advantages of low cost and low processing difficulty. At the same time, the device realizes accurate pre-positioning of the blank, adaptive alignment of the upper and lower mold components to the center, and automatic material return by mechanical power. The operation is simple and the prevention of scratches or indentations of product parts is taken into consideration. It has wide adaptability, high molding efficiency, good precision control, stable and reliable quality, and can meet the mass production needs of plum blossom tube skeleton molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments of the present invention. It is obvious that the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of the plum blossom tube skeleton forming device;

[0017] Figure 2 This is the bottom view of the base;

[0018] Figure 3 This is a half-section side view of the base;

[0019] Figure 4 Schematic diagram of the upper mold assembly structure;

[0020] Figure 5 Schematic diagram of the material return assembly structure;

[0021] Figure 6 Schematic diagram of the core shaft structure;

[0022] Figure 7 is a cross-sectional view of the core shaft along the radial direction;

[0023] Figure 8 It is a cross-sectional view of the positioning sleeve;

[0024] Figure 9 It is a top view of the positioning sleeve;

[0025] Figure 10 This is a schematic diagram of a typical plum blossom tube skeleton;

[0026] Figure 11 This is a cross-sectional view of a typical plum blossom tube skeleton along the radial direction;

[0027] Among them, 1-base, 2-core shaft, 3-roller, 4-small shaft, 5-nut, 6-pin, 7-long screw, 8-support, 9-steel ball, 10-spring one, 11-screw plug, 12-rectangular positioning pin, 13-positioning sleeve, 14-screw, 15-pressure sleeve fixing plate 16-core shaft fixing plate, 17-movable plate, 18-upper template, 19-spring two, 20-top rod, 21-pressure sleeve. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are set forth in order to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific arrangement and method set forth below, but rather covers any improvements, replacements, and modifications of structures, methods, and devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, well-known structures and techniques are not shown to avoid unnecessary ambiguity in the present invention.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] Figure 1 This is a schematic diagram of the overall structure of this device, comprising a forming base, an upper die assembly, and a stripper assembly. The forming base is placed on the lower worktable of the press, which has a 150mm diameter through-hole in the center. The upper die assembly is installed in the T-slot of the upper worktable, and the forming base and upper die assembly are quickly aligned through adaptive motion. The stripper assembly is suspended from the upper die assembly by a spring and a push rod. As the upper worktable descends, the stripper assembly automatically strips the material through the reaction of the machine tool's external shape. This device offers high efficiency and stable forming quality.

[0032] refer to Figure 1 The plum blossom tube skeleton forming device specifically includes: base 1, core shaft 2, roller 3, small shaft 4, nut 5, pin 6, long screw 7, support 8, steel ball 9, spring 10, screw plug 11, rectangular positioning pin 12, positioning sleeve 13, screw 14, pressure sleeve fixing plate 15, core shaft fixing plate 16, movable plate 17, upper template 18, spring 2 19, push rod 20, and pressure sleeve 21.

[0033] The device as a whole can be divided into the following core components:

[0034] The first part is the base assembly, which is placed on the lower workbench of the press when in use. The middle roller is within the Φ150 hole in the middle of the lower workbench of the press. Its main function is to pre-position the plum blossom tube blank and provide the outer surface of the plum blossom tube forming, ensuring reliable positioning, smooth forming process and stable forming size. Figure 2-3The assembly mainly includes: base 1, roller 3, small shaft 4, nut 5, pin 6, long screw 7, support 8, steel ball 9, spring 10, screw plug 11, rectangular locating pin 12, and locating sleeve 13. When assembling the base, first install the roller 3 in the support positioning hole using the small shaft 4 and nut 5. The small shaft 4 and roller assembly holes match F7 / h6. The step height of the small shaft 4 is consistent with the thickness of the support 8. The thickness of the roller 3 and the positioning groove of the support 8 have a double clearance of 0.01mm. This allows the roller 3 to rotate freely on the support 8 without shaking. Then, install the support 8 and the roller together in the evenly spaced positioning grooves of the base and pre-tighten the long screw 7. Then, a steel ball 9, adjustment spring 10, and screw plug 11 are installed within the locating sleeve 13. Using a process shaft, the cylinder formed by the steel ball 9 is aligned concentrically with the center hole of the locating sleeve 13. After testing with a product blank, ensuring smooth positioning, moderate elasticity, and no scratches on the product, the locating sleeve is pressed into the center hole of the base. A rectangular locating pin 12 is used to ensure the correct angular orientation. Finally, using the process shaft, the roller is formed into a circle that matches the product's shape. This circle is coaxial with the locating sleeve 13, with an error of no more than 0.10 mm. This circle is then aligned with the mounting holes for pins 6 on the base, and the pins are assembled. Supports are evenly spaced in the locating slots of the base, and the rollers are secured to the supports with small shafts and nuts, ensuring smooth rolling without falling off. The rollers are assembled around the center of the base, their profile matching the plum blossom tube's shape, and their inner circle matches the final dimensions of the plum blossom tube. A spring and screw plug are installed behind the steel balls, providing the appropriate elasticity to ensure that the steel balls remain in place without causing any damage or abrasions when in contact with the frame. In addition, the lower end of the mandrel is provided with a 10° taper and an R1 smooth transition, see Figure 4 , ensuring stable import and export during the molding process and reducing molding defects.

[0035] The positioning sleeve matches the size of the skeleton blank. To ensure smooth installation, the positioning hole should have an appropriate gap, and the installation mouth should be chamfered and rounded. Figure 7-8 The positioning sleeve is press-fitted into the center hole of the base. A rectangular positioning pin determines the angular orientation, aligning the uniformly distributed steel balls installed in a specific position on the sleeve with the rollers. This ensures precise docking and assists in positioning when installing the plum blossom tube blank. The positioning sleeve matches the size of the frame blank. To ensure smooth installation, the positioning hole should have an appropriate gap, and the installation opening should have chamfered and rounded corners.

[0036] The second part is the upper die assembly, which is installed on the T-slot of the upper workbench of the press with bolts and nuts through the U-slot on the upper template. It is the key to forming the inner dimensions of the plum blossom tube. The mandrel provides sufficient strength and guidance, and the mandrel fixing plate ensures that the mandrel and the upper template are vertically stable. When in use, the upper workbench of the press drives the downward pressure. During the downward pressure process, the surface formed by the lower die roller completes the formation of the plum blossom tube. After the forming is completed, the upper workbench of the press rises and completes the material removal together with the material removal assembly. Figure 4, mainly includes: core shaft 2, screw 14, core shaft fixing plate 16 and upper template 18. When assembling the upper mold assembly, the core shaft 2 is fixed to the upper template 18 through the core shaft fixing plate 16 and the screw 14. The core shaft 2 and the core shaft fixing plate should be relatively vertical when installed and firmly glued. The core shaft is fixed to the upper template through the core shaft fixing plate and screws. The core shaft is provided with a shape that matches the inner shape of the skeleton to ensure the molding accuracy; the core shaft is made of 40Cr material, with a heat treatment hardness of HRC40-45. The shape of the core shaft is designed according to the inner shape of the plum blossom tube, and the concave transition fillet is deliberately reduced to optimize the material flow path.

[0037] The third part is the material removal assembly, which is suspended on the upper die assembly by a push rod and a spring. After the molding is completed, when the upper work table of the press moves upward, the push rod hits the outer shape of the machine tool, driving the movable plate connected to the push rod. The pressure sleeve is installed in the middle of the movable plate through the pressure sleeve fixing plate and screws. As the movable plate moves, the pressure sleeve quickly and smoothly pushes the formed plum blossom tube out of the mold to complete the material removal. Figure 5 , mainly includes: screws 14, pressure sleeve fixing plate 15, movable plate 17, push rod 20 and pressure sleeve 21. When assembling the stripping assembly, the pressure sleeve fixing plate 15 fixes the pressure sleeve 21 to the center position of the movable plate 17 through the screws 14, and then the pressure sleeve 21 is put on the core shaft 2 of the upper mold assembly. At this time, it should be noted that the movable plate 17 and the upper template 18 have the same outer shape and position. Then, the push rod 20 with the spring 19 is tightened and assembled with the two threaded holes of the movable plate 17 through the two through holes of the upper template 18. The pressure sleeve is made of 20# steel material. The cross-sectional shape of the pressure sleeve is consistent with the cross-sectional shape of the skeleton. The sharp edge of the pressure sleeve in contact with the product needs to be polished so that the skeleton and the inner surface of the positioning sleeve will not be damaged during the stripping process. The pressure sleeve and the pressure sleeve fixing plate are flared during assembly to ensure that the pressure sleeve will not fall off.

[0038] The material removal component is designed based on the characteristic structure of the press, and takes advantage of the space size of the press to realize the automatic ejection of the plum blossom tube after forming.

[0039] The use process of this utility model is:

[0040] 1) Install the upper die assembly: Pass the T-bolt through the T-slot of the upper workbench of the press, support the upper die assembly, make the four U-slots of the upper die assembly correspond to the T-screws, tighten the nuts, fix the upper die assembly on the T-slot of the upper workbench of the press, and ensure that it is firmly installed;

[0041] 2) Install the base assembly and align it: Place the base assembly on the lower work surface of the press, aligning the base with the upper die assembly; Place the part blank into the positioning sleeve, turn on the press, and slowly lower the upper work table of the press so that the tapered surface of the forming mandrel is aligned with the inner hole of the part blank;

[0042] 3) Test the stripper assembly: The stripper assembly is suspended on the upper die assembly by a push rod and a spring. It has been installed in the first step. During the test, do not load the part blank first. Turn on the press. After the press moves downward and then rises, the stripper rod hits the machine tool frame, causing relative displacement between the pressure sleeve and the forming mandrel. The test ends when the action is smooth and there is no abnormality.

[0043] 4) First piece and batch processing: When processing the first piece, the press stroke must be adjusted accurately and the processing speed must be set appropriately. During batch processing, the worker first inserts the part blank into the positioning hole of the locating sleeve to ensure that the evenly distributed small holes on the part blank are consistent with the angular orientation of the pre-positioned steel balls in the locating sleeve. Then, the press is started by stepping on the foot switch. At this time, the upper die assembly and the material removal assembly move downward together, and the forming mandrel on the upper die assembly moves downward against the part blank. When passing through the six evenly distributed rollers of the lower die assembly, the forming mandrel and the rollers work together to squeeze the part blank into a plum blossom shape. When the press returns, the part is wrapped around the forming mandrel and moves upward with the upper die. After reaching a specific height, the material removal rod touches the outer frame of the press, and the material removal assembly starts to operate. The pressure sleeve will push the formed plum blossom tube off the forming mandrel, thus completing the material removal. During the forming process, the plum blossom tube blank can be lubricated with special lubricating oil for stainless steel.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should all be included in the protection scope of the present invention.

Claims

1. A plum blossom tube skeleton forming device, characterized in that: The cam is provided with a plurality of cams, and the cams are provided with a plurality of cams, and the cams are provided with a plurality of cams, and the cams are provided with a plurality of cams, and the cams are provided with a plurality of cams.

2. The plum blossom tube skeleton forming device according to claim 1, characterized in that: A support member positioning hole is provided on one side of the support member close to the center, and the roller is installed in the support member positioning hole through a small shaft and a nut.

3. The plum blossom tube skeleton forming device according to claim 1, characterized in that: The supporting piece is installed in the positioning groove of the base through pins and long screws.

4. The plum blossom tube skeleton forming device according to claim 1, characterized in that: The positioning sleeve is arranged in the mounting hole at the top of the base, a slot is arranged on the outer circular surface of the positioning sleeve, and a key is arranged on the inner circular surface of the mounting hole at the top of the base. The key slot cooperates to prevent the positioning sleeve from rotating in the mounting hole at the top of the base.

5. The plum blossom tube skeleton forming device according to claim 4, characterized in that: The positioning sleeve has multiple radial positioning holes arranged along the radial direction, and the radial positioning holes are arranged around the center of the positioning sleeve. A steel ball and a spring are set in the radial positioning hole. The steel ball is close to the inner hole of the positioning sleeve. One end of the spring presses the steel ball, and the other end contacts the screw plug set in the radial positioning hole.

6. The plum blossom tube skeleton forming device according to claim 5, characterized in that: The diameter of the steel ball is larger than the diameter of the radial positioning hole on the side close to the inner hole of the positioning sleeve to ensure that the steel ball will not fall out of the radial positioning hole.

7. The plum blossom tube skeleton forming device according to claim 1, characterized in that: The pressure sleeve is fixed to the center of the lower end of the movable plate through the pressure sleeve fixing plate and screws; the core shaft is fixed to the center of the lower end of the upper template through the core shaft fixing plate and screws, and the core shaft and the core shaft fixing plate are relatively vertical when installed.

8. The plum blossom tube skeleton forming device according to claim 7, characterized in that: The lower end of the core shaft is a smoothly transitioned conical structure with a taper of 10°.

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