Thin-walled part convexity one-time forming tool

Abstract

The application discloses a one-time forming tool for a convex bump of a cylindrical thin-wall part, which comprises a forming cover body, a main positioning body and a positioning block detachably embedded on the main positioning body, the main positioning body and the positioning block form a supporting column, the forming cover body and the supporting column clampingly hold a thin-wall part forming convex bump part, the main positioning body is installed on a base, the base and the forming cover body are connected through a connecting structure, a through hole is formed on the forming cover body at a position corresponding to a convex bump position on the thin-wall part, the positioning block is arranged at a position corresponding to the convex bump position on the thin-wall part and blind holes corresponding to the through hole position on the forming cover body are arranged on the positioning block, the blind hole structure is the same as the convex bump structure, and the forming tool further comprises a punch which penetrates into the through hole of the forming cover body and impacts the thin-wall part to form the convex bump. The positioning block is embedded on the main positioning body, after the part is clamped in place and all the convex bumps are punched out, the forming cover is first disassembled, then the part and the positioning block are taken out together, and finally the part is separated, so that one-time clamping forming of all the convex bumps of the part and smooth demolding are realized.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a tooling for one-time forming of a cylindrical thin-walled part with a convex bulge. Background Technology

[0002] In the machining industry, it is common to encounter situations where thin-walled parts need to be formed with convex bulges. For example, in the field of aero-engines, the heat shield parts on aero-engines are thin-walled parts, and their structure is shown in the attached instruction manual. Figure 3 As shown, the part is only 0.5mm thick, made of stainless steel, with multiple evenly distributed protrusions on the sidewalls and the bottom also having evenly distributed protrusions.

[0003] When using traditional rigid molds to form sidewall and bottom bulges on parts, due to structural limitations, the parts cannot be removed from the mold after the bulges are formed. Alternatively, after processing with traditional molds, a dividing plate is needed to form the sidewall bulges individually, but this operation results in poor forming position and dimensional accuracy, and only the sidewall bulges can be formed around the circumference of the part, while the bottom bulges need to be formed again. Another option is to use wedge blocks to push the mold sideways, with the punch and die moving horizontally towards each other for forming, but this mold structure is complex and costly, significantly increasing the production cost of the parts.

[0004] Patent CN202861135U discloses a convex bulge stamping die structure, including a punch and a die located below the punch. The center of the die is recessed downward to form a hollow cavity, and an ejector pin is provided inside the cavity. The gap between the ejector pin and the punch is the convex bulge forming space. This patent's convex bulge stamping die structure adopts an "expansion" process when forming convex bulges, which can realize the stamping of multiple convex bulges in one pass in a continuous stamping die with multi-station continuous feeding, without the need for a shaping process, and the measurement results of each convex bulge fully meet the product accuracy requirements.

[0005] Although the convex stamping die structure of the above-mentioned patent can stamp multiple convex bulges at one time, the convex bulges of the part are all set on the same surface, and the surface is a flat surface. Obviously, when the convex bulges on the part are distributed on multiple surfaces or the surface on which the convex bulges are set is a curved surface, the convex stamping die structure cannot stamp multiple convex bulges at one time. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a one-time forming fixture for the bulge of a cylindrical thin-walled part. This forming fixture can achieve one-time clamping and forming of the bulge at any position on the cylindrical thin-walled part, and the forming fixture can be smoothly detached from the part without affecting the forming quality of the bulge.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A one-time forming fixture for a cylindrical thin-walled part, the protrusion including at least one protrusion disposed on the cylindrical wall of the thin-walled part, the forming fixture including a forming cover, a main positioning body, and a positioning block detachably embedded in the main positioning body, the main positioning body and the positioning block forming a support column, the forming cover and the support column clamping the protrusion portion of the thin-walled part, the support column contacting the inner surface of the thin-walled part, the forming cover contacting the outer surface of the thin-walled part, the main positioning body being mounted on a base, the base and the forming cover being connected by a connecting structure, the forming cover having a through hole corresponding to the position of the protrusion on the thin-walled part, the positioning block being positioned corresponding to the position of the protrusion on the thin-walled part, and the positioning block having a blind hole corresponding to the position of the through hole on the forming cover, the blind hole structure being the same as the protrusion structure on the thin-walled part, the forming fixture also including a punch for inserting into the through hole of the forming cover to impact the thin-walled part to form the protrusion.

[0009] Furthermore, a keyway is provided on the main positioning body, and a key is provided on the positioning block to connect with the keyway.

[0010] Furthermore, the cross-section of the positioning block has an "I" shape.

[0011] Furthermore, a connector is provided between the main positioning body and the base for connection and positioning.

[0012] Furthermore, the connector is a cylindrical pin.

[0013] Furthermore, the connection structure includes a connecting shaft and a locking nut.

[0014] Furthermore, the gap between the base and the plane on which the molding tooling is placed is less than or equal to 0.02 mm.

[0015] Furthermore, there is a gap between the lower end face of the thin-walled component and the base.

[0016] Furthermore, the spacing is greater than or equal to 10 mm.

[0017] Furthermore, the punch has a two-section structure comprising a coarse section and a fine section, wherein the fine section is used to impact the convex bulge and the coarse section is used to apply impact force.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] By inserting positioning blocks into the main positioning body, the main positioning body and positioning blocks form a support body that can completely support the part. The main positioning body, positioning blocks and forming cover are clamped into place in one go. After punching all the protrusions of the part into shape, the forming cover is removed, and then the part and positioning blocks are taken out together. Finally, the part and positioning blocks are separated, realizing the one-time clamping and forming of all the protrusions on the part and the smooth demolding of the part.

[0020] This forming fixture has a simple structure, making the forming of the convex hull convenient and reliable, and providing high dimensional and positional accuracy for the convex hull forming. Attached Figure Description

[0021] Figure 1 This is a top view of the structure of the forming fixture used to clamp the forming convex bulge of the part described in Example 1;

[0022] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0023] Figure 3 This is a schematic diagram of the structure of the part described in Example 1. Detailed Implementation

[0024] To clearly illustrate the technical features of this solution, the following detailed description, in conjunction with the accompanying drawings, will explain the technical solution in detail.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0026] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0029] Example 1

[0030] like Figure 3 The cylindrical thin-walled component shown is a heat shield for an aero-engine, with protrusions 11 on its side walls and bottom. This embodiment provides a tooling for one-time forming of the protrusions for this type of part, such as... Figure 1 and Figure 2 As shown, the molding fixture includes a molding cover 2, a main positioning body 31, and a positioning block 32 detachably inserted into the main positioning body. The main positioning body 31 and the positioning block 32 constitute a complete support column 3, which is cylindrical. The molding cover 2 is a cylindrical body that mates with the support column 3. The molding cover 2 and the support column 3 can fit and clamp the protruding part of the heat insulation cover. The support column 3 achieves part centering through its outer diameter and provides support and limitation for the part through its top. The support column 3 is in contact with the inner surface of the heat insulation cover, and the molding cover 2 is in contact with the outer surface of the heat insulation cover.

[0031] A through hole 21 is opened on the molded cover 2 at a position corresponding to the protrusion on the heat insulation cover. The positioning block 32 is positioned corresponding to the protrusion on the heat insulation cover, and the positioning block is provided with a blind hole 321 corresponding to the position of the through hole 21 on the molded cover. The diameters of the through hole and the blind hole are equal, and the structure of the blind hole is the same as the structure of the protrusion on the heat insulation cover. The molding tool also includes a punch 4 for extending into the through hole 21 of the molded cover to impact the heat insulation cover so that a protrusion 11 is formed on the heat insulation cover. The main positioning body 31 is set on a base 5. To determine the angular orientation of the forming cover 2, a connecting structure is also provided between the base 5 and the forming cover 2. At least two overlapping edges 22 extend radially outward from the opening of the forming cover 2. The connecting structure includes a connecting shaft 61 and a locking nut 62. A positioning hole is provided on the base 5 for the first end of the connecting shaft 61 to be inserted. An insertion hole is provided on the overlapping edge 22 of the forming cover for the second end of the connecting shaft 61 to be inserted. The end of the connecting shaft 61 extending out of the overlapping edge is preferably designed as a threaded end. The locking nut 62 is screwed onto the threaded end. While the forming cover 2 is pressed by the locking nut 62, the bottom of the part is also pressed. On the one hand, this avoids the forming cover from being slightly displaced, which would cause the punch 4 to fail to align with the blind hole 321 when impacting the part. On the other hand, it also prevents the part from shifting when impacting the convex bulge later.

[0032] In this embodiment, the positioning block is designed to be inserted into the main positioning body as follows: a keyway 311 is provided on the main positioning body 31, and a key 322 is provided on the positioning block 32 to connect with the keyway. The positioning block 32 has an "I" shaped cross-section. This keyway-type insertion design ensures reliable and accurate radial positioning of the positioning block 32 on the main positioning body 31. The number of positioning blocks 32 is appropriately determined based on the distribution of protrusions on the part. For example, in this embodiment, the protrusions of a single area on the sidewall of the part and the protrusions at the bottom are relatively close, so the protrusions of the sidewall and the bottom of that area can be concentrated into one positioning block. In this embodiment, three positioning blocks are provided, and each positioning block has blind holes at the parts that fit with the bottom of the part and the parts that fit with the sidewall of the part.

[0033] To reduce the difficulty of tooling processing, the main positioning body 31 and the base 5 are manufactured separately and connected and positioned by the connector 7. The connector 7 can be made of cylindrical pins, screws, etc.

[0034] When using the above-mentioned tooling to form the convex shape of a part, the entire tooling is placed on a platform, with the base 5 in contact with the platform. To ensure the convex shape effect and to avoid jamming when the punch impacts the part, it is necessary to ensure that the gap between the base 5 and the platform plane is less than or equal to 0.02mm after the base 5 contacts the platform.

[0035] Furthermore, when the part is clamped in the forming cover 2 and the support column 3, a gap should be left between the lower end face of the part and the base 5 to prevent contact interference between the lower end face of the part and the base 5, which could result in the bottom of the part being suspended. Preferably, this gap is designed to be greater than or equal to 10mm to fully ensure the clamping and convex forming effect of the part.

[0036] The punch 4 used for impacting parts has a two-section structure including a coarse section 41 and a fine section 42. The fine section is used to impact the convex hull. The front end structure of the fine section 42 is the same as the convex hull structure, which is generally hemispherical. The coarse section 41 is used to apply impact force and is generally a cylinder that forms a step with the fine section.

[0037] The working process of this molding fixture is as follows: First, the positioning block is installed on the main positioning body to form a support column. The part is then upside down and positioned on the support column. The connecting shaft is inserted into the base. Then, the molding cover is fitted onto the connecting shaft. The molding cover is fixed and pressed by the locking nut on the connecting shaft. At the same time as pressing, the bottom of the part is pressed and fixed. At this time, the part is in contact with the upper surface and outer periphery of the support column (that is, in contact with the surface of the positioning block with blind holes). Align the punch with any through hole on the forming cover, ensuring contact between the punch and the part. Use a hammer to strike the thicker section of the punch, causing the thinner section to enter the corresponding blind hole of the positioning block, thus forming the protrusion on the part. Then, pull out the punch and repeat the process to form the remaining protrusions. Once the protrusions are fully formed, loosen the locking nut on the connecting shaft with a wrench and remove the forming cover. Since the part has formed a protrusion, it will be embedded in the positioning block. As the part is removed, the positioning block will be removed from the main positioning body along with the part. Finally, separate the positioning block from the part. At this point, the part is completely removed, completing the one-time forming and successful demolding of the protrusion on the part.

[0038] Example 2

[0039] A tooling for one-time forming of a thin-walled part's convex bulge, such as Figure 1 and Figure 2 As shown, the molding fixture includes a molding cover, a main positioning body, and a positioning block detachably inserted into the main positioning body. The main positioning body and the positioning block form a complete support column, which is cylindrical. The molding cover is a cylindrical body that mates with the support column. The molding cover and support column can fit and clamp the protruding part of the heat insulation cover. The support column centers the part through its outer diameter and provides support and limitation for the part through its top. The support column contacts the inner surface of the heat insulation cover, and the molding cover contacts the outer surface of the heat insulation cover.

[0040] The forming cover has through holes at positions corresponding to the protrusions on the heat insulation cover. The positioning block is positioned to correspond to the protrusions on the heat insulation cover, and the positioning block has blind holes corresponding to the through holes on the forming cover. The diameters of the through holes and blind holes are equal, and the structure of the blind holes is the same as the structure of the protrusions on the heat insulation cover. The forming tool also includes a punch for inserting into the through holes of the forming cover to impact the heat insulation cover so that protrusions are formed on the heat insulation cover. The main positioning body is set on a base. To determine the angular orientation of the forming cover, a connecting structure is also provided between the base and the forming cover. At least two overlapping edges extend radially outward from the opening of the forming cover. The connecting structure includes a connecting shaft and a locking nut. A positioning hole is opened on the base for the first end of the connecting shaft to be inserted. An insertion hole is opened on the overlapping edge of the forming cover for the second end of the connecting shaft to be inserted. The end of the connecting shaft extending out of the overlapping edge is preferably designed as a threaded end. The locking nut is screwed onto the threaded end. While the forming cover is pressed tightly by the locking nut, the bottom of the part is also pressed tightly. On the one hand, this avoids the forming cover from being slightly displaced, which would cause the punch to fail to align with the blind hole position when impacting the part. On the other hand, it also prevents the part from moving around when impacting the convex bulge later.

[0041] The positioning block is designed to be inserted into the main positioning body as follows: a keyway is provided on the main positioning body, and a key is provided on the positioning block to connect with the keyway. The difference between this embodiment and embodiment 1 is that the cross-section of the positioning block is a "T" structure. This keyway-type insertion design makes the radial positioning of the positioning block on the main positioning body reliable and accurate. The number of positioning blocks is appropriately determined according to the distribution of the protrusions on the part.

[0042] To reduce the difficulty of tooling processing, the main positioning body and the base are manufactured separately and connected and positioned by connectors, such as cylindrical pins and screws.

[0043] When using the above-mentioned tooling to form the convex shape of a part, the entire tooling is placed on a platform with the base in contact with the platform. To ensure the convex shape effect and to avoid jamming when the punch impacts the part, it is necessary to ensure that the gap between the base and the platform plane is less than or equal to 0.02mm after the base and the platform are in contact.

[0044] Furthermore, when the part is clamped in the forming cover and support column, a gap should be left between the lower end face of the part and the base to prevent contact interference between the lower end face of the part and the base, which could result in the bottom of the part being suspended. Preferably, this gap is designed to be greater than or equal to 10mm to fully ensure the clamping and convex forming effect of the part.

[0045] The punch used for impacting parts has a two-section structure consisting of a thick section and a thin section. The thin section is used to impact the convex bulge, and its front end structure is the same as the convex bulge structure, generally hemispherical. The thick section is used to apply the impact force, and is generally a cylinder that forms a step with the thin section.

[0046] Example 3

[0047] The difference between this embodiment and embodiment 1 is that the connection structure between the molded cover and the base is a screw and a matching nut.

[0048] Example 4

[0049] The difference between this embodiment and embodiment 1 is that the main positioning body and the base are integrally formed.

[0050] Obviously, the above embodiments are merely examples to clearly illustrate the technical solutions of the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A tooling for one-time forming of a convex bulge on a cylindrical thin-walled part, wherein the convex bulge includes at least a convex bulge disposed on the cylindrical wall of the cylindrical thin-walled part, characterized in that, The molding fixture includes a molding cover, a main positioning body, and a positioning block detachably embedded in the main positioning body. The main positioning body and the positioning block form a support column. A keyway is formed on the main positioning body, and a key is provided on the positioning block to connect with the keyway. The molding cover and the support column fit and clamp the molding protrusion of the thin-walled part. The support column contacts the inner surface of the thin-walled part, and the molding cover contacts the outer surface of the thin-walled part. The main positioning body is mounted on a base, and the base and the molding cover are connected by a connecting structure. At least two overlapping edges extend radially outward from the opening. The connecting structure includes a connecting shaft and a locking nut. The connecting shaft passes through the overlapping edges to connect the forming cover to the base. A through hole is opened on the forming cover at a position corresponding to the protrusion on the thin-walled part. The positioning block is positioned corresponding to the protrusion on the thin-walled part, and the positioning block has a blind hole corresponding to the position of the through hole on the forming cover. The blind hole structure is the same as the protrusion structure on the thin-walled part. The forming tooling also includes a punch for inserting into the through hole of the forming cover to impact the thin-walled part to form the protrusion.

2. The tooling for one-time forming of the convex bulge of a cylindrical thin-walled part according to claim 1, characterized in that, The cross-section of the positioning block has an "I" shape.

3. The tooling for one-time forming of the convex bulge of a cylindrical thin-walled part according to claim 1, characterized in that, A connector is also provided between the main positioning body and the base for connection and positioning.

4. The tooling for one-time forming of the convex bulge of a cylindrical thin-walled part according to claim 3, characterized in that, The connector is a cylindrical pin.

5. The tooling for one-time forming of the convex bulge of a cylindrical thin-walled part according to claim 1, characterized in that, The gap between the base and the plane on which the molding tooling is placed is less than or equal to 0.02 mm.

6. The tooling for one-time forming of the convex bulge of a cylindrical thin-walled part according to claim 1, characterized in that, There is a gap between the lower end face of the thin-walled component and the base.

7. The tooling for one-time forming of the convex bulge of a cylindrical thin-walled part according to claim 6, characterized in that, The spacing is greater than or equal to 10 mm.

8. The tooling for one-time forming of the convex bulge of a cylindrical thin-walled part according to claim 1, characterized in that, The punch has a two-section structure consisting of a thick section and a thin section. The thin section is used to impact the convex bulge, and the thick section is used to apply impact force.

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