Nut machining fixture for stress corrosion detection of aviation aluminum alloy medium plate
By designing a nut machining fixture for stress corrosion detection of medium-thick plates of aerospace aluminum alloy, the problem of positional displacement caused by traditional fixtures was solved, enabling rapid positioning and efficient machining of nut blanks and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGXI NANNAN ALUMINUM PROCESSING CO LTD
- Filing Date
- 2025-04-24
- Publication Date
- 2026-06-16
AI Technical Summary
In existing technologies, traditional drilling machine processing fixtures cause the position of hexagonal nut blanks to shift, affecting the machining accuracy of threaded holes and their performance. Furthermore, the presence of contamination testing samples of steel bolts and nuts on the market increases production costs.
A nut processing fixture for stress corrosion testing of medium-thick plates of aerospace aluminum alloy was designed, including a mold base, a fixed cover plate, a connector and an elastic ejector. The design of positioning holes and processing holes ensures accurate positioning of the nut blank, and the elastic ejector directly ejects the processed nut, avoiding cumbersome disassembly and assembly steps.
It enables rapid positioning and fixing of nut blanks, ensuring that the drill bit is accurately positioned for tapping, improving machining accuracy and efficiency, reducing production costs, and simplifying the operation process.
Smart Images
Figure CN224359738U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of fixture technology, and specifically relates to a nut processing fixture for stress corrosion detection of medium-thick plates of aerospace aluminum alloy. Background Technology
[0002] Aluminum alloy medium-thick plates for aerospace applications typically require high overall performance, and their factory performance testing includes numerous items, with C-ring stress corrosion resistance being a crucial mandatory test. Stress corrosion testing involves machining a C-ring specimen along the SL direction from the center thickness layer of the aluminum alloy medium-thick plate. Symmetrical double holes must be machined into the C-ring specimen, and bolts are inserted and tightened with nuts. Based on the material's elastic modulus, the change in the diameter of the C-ring specimen characterizes the applied stress value.
[0003] C-ring testing is very common in aluminum alloy processing enterprises, resulting in a large demand for bolts and nuts used in C-ring testing. However, the bolts and nuts required for C-ring testing must be of the same alloy grade as the tested sample, i.e., the same material. This is so that they can be recycled and reused after testing. Currently, the nuts and bolts available on the market are all made of steel. If commercially available bolts and nuts are used, they will contaminate the tested sample during recycling, making the remanufactured products unusable, resulting in raw material waste and increased production costs. Therefore, the bolts and nuts used for C-ring testing need to be manufactured in-house.
[0004] Currently, the processing technology for nuts used in C-ring testing usually involves first cutting hexagonal nut blanks on a wire cutting machine, then placing the hexagonal blanks on a drilling machine fixture, and installing taps to process the threads of the nuts. However, traditional drilling machine fixtures are large, and when clamping a single nut, it is easy to cause positional deviation, resulting in inaccurate thread hole processing positions, which affects the accuracy and performance of the nuts. Utility Model Content
[0005] The purpose of this utility model is to provide a nut machining fixture for stress corrosion testing of medium-thick plates of aerospace aluminum alloy. This fixture is compatible with drilling machine fixtures and can ensure that the center of the hexagonal nut blank to be tapped does not shift during machining. Furthermore, after the threaded hole is machined, the hexagonal nut can be smoothly ejected. The specific technical solution is as follows:
[0006] A nut processing fixture for stress corrosion detection of medium-thick aerospace aluminum alloy plates includes a drill press fixture, on which a nut processing fixture assembly is held.
[0007] The nut processing fixture assembly includes a placement mold base, a fixed cover plate, a connector, and an elastic feeding part. The placement mold base has a through-hole for placing the nut blank to be processed. The elastic feeding part is detachably installed on the lower surface of the placement mold base and corresponds to the positioning hole. The fixed cover plate has a processing hole corresponding to the positioning hole. The fixed cover plate is used to press the nut blank to be processed into the positioning hole. The placement mold base and the fixed cover plate are connected by the connector.
[0008] Preferably, the positioning hole is a hexagonal slot large enough to accommodate the nut blank to be processed.
[0009] Preferably, the machining hole is a circular groove, and the machining hole is the inscribed circle of the positioning hole.
[0010] Preferably, the placement mold base is provided with an insertion hole and a threaded hole, the insertion hole and the threaded hole being located on opposite sides of the positioning hole.
[0011] Preferably, a through hole is provided on each of the opposite sides of the machining hole, and the two through holes are respectively arranged opposite to the insertion hole and the threaded hole.
[0012] Preferably, the connector includes a positioning pin and a connecting bolt, the fixing cover plate is connected to the placement mold base by the connecting bolt, and the positioning pin connects the through hole and the insertion hole.
[0013] Preferably, the elastic delivery part includes a bearing base plate, a delivery spring, and a receiving block. The bearing base plate is detachably mounted on the lower surface of the placement mold base. The receiving block is mounted on the bearing base plate by the delivery spring and is located in the positioning hole. The upper surface of the receiving block is lower than the upper surface of the placement mold base so that the nut blank to be processed can be positioned by the positioning hole.
[0014] Preferably, the supporting base plate and the receiving block are provided with corresponding discharge holes.
[0015] Compared with existing technologies, this utility model has the following beneficial effects:
[0016] 1. This utility model provides a nut processing fixture for stress corrosion testing of medium-thick plates of aerospace aluminum alloy. This nut processing fixture can quickly position and fix the nut blank to be processed. Furthermore, the fixture can directly expose the center to be processed of the nut blank, making it convenient for the drill bit on the drilling machine to find the correct position and tap the thread. This nut processing fixture eliminates the tedious steps of repeatedly disassembling and reassembling the traditional fixture to remove the processed nut from the positioning hole. The fixture is equipped with an elastic ejection part, which can directly eject the processed nut, ensuring smooth and efficient processing.
[0017] 2. The nut processing fixture provided by this utility model has a simple structure and is easy to operate. It can process multiple nut blanks at one time, thereby improving production efficiency. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn to scale.
[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0020] Figure 2 This is an exploded view of the nut processing fixture assembly of this utility model.
[0021] Explanation of key figure labels:
[0022] 100-Drilling machine fixture, 200-Nut processing fixture assembly, 210-Mold holder, 211-Positioning hole, 212-Insertion hole, 213-Threaded hole, 220-Fixing cover plate, 221-Processing hole, 222-Through hole, 230-Connector, 231-Positioning pin, 232-Connecting bolt, 240-Elastic feed part, 241-Bearing base plate, 242-Feed-out spring, 243-Receiving block, 300-Nut blank to be processed. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.
[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first," "second," and "third" are used in the description, they are for descriptive purposes and to distinguish technical features, and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.
[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.
[0027] Example
[0028] like Figures 1 to 2 As shown, a nut processing fixture for stress corrosion testing of medium-thick plates of aerospace aluminum alloy includes a drill press fixture 100, on which a nut processing fixture assembly 200 is held. The nut processing fixture assembly 200 is used to position and hold the nut blank 300 to be processed. The nut processing fixture assembly 200 can directly expose the machining center of the nut blank 300 to be processed, so that the drill bit on the drill press can perform tapping operation on the machining center.
[0029] Preferably, the nut processing fixture assembly 200 includes a placement mold base 210, a fixed cover plate 220, a connector 230, and an elastic delivery part 240. The placement mold base 210 has a through-hole 211 for placing the nut blank 300 to be processed. It is worth mentioning that multiple nut blanks 300 to be processed can be placed in the positioning hole 211 at one time to meet the batch processing requirements. The elastic delivery part 240 is detachably installed on the lower surface of the placement mold base 210 and corresponds to the positioning hole 211. The elastic delivery part 240 supports the inserted nut blank 300 to be processed. The fixed cover plate 220 is provided with processing holes 221 corresponding to the positioning holes 211. The fixed cover plate 220 presses a batch of nut blanks 300 to be processed into the positioning holes 211. Under the action of the elastic delivery part 240, the batch of nut blanks 300 to be processed are pressed. The placement mold base 210 and the fixed cover plate 220 are connected by the connector 230.
[0030] In some preferred embodiments, to ensure that the nut blank 300 to be processed is not drilled out during the tapping process, the positioning hole 211 and the processing hole 221 have different hole shapes. The processing hole 221 is a circular slot, while the positioning hole 211 is a hexagonal slot, and the processing hole 221 is the inscribed circle of the positioning hole 211. The purpose is to allow the fixing cover plate 220 to press down (cover down) the hexagon of the nut blank 300 to be processed through the processing hole 221 to prevent it from being drilled out during processing. The positioning hole 211 is used to position and hold the nut blank 300 to be processed, and the fixing cover plate is used to hold it. 220. The nut blank 300 to be processed is fixed and pressed. It is worth mentioning that, in order to ensure that the nut blank 300 to be processed can be smoothly put into and taken out in the positioning hole 211, the diameter of the positioning hole 211 is slightly larger than the diameter of the nut blank 300 to be processed, so that the positioning hole 211 is large enough to fit the nut blank 300 to be processed (the accuracy requirement of the hole position is not high in this process, but it is necessary to ensure that the processed threaded hole is located in the center position of the nut blank 300 to be processed as much as possible during the processing. Therefore, the offset of the blank during the threaded hole processing is negligible because the size of the positioning hole 211 is slightly larger than the size of the nut blank 300 to be processed).
[0031] In some preferred embodiments, the mold base 210 is provided with an insertion hole 212 and a threaded hole 213, which are located on opposite sides of the positioning hole 211. Further, a through hole 222 is provided on each opposite side of the machining hole 221, the positions of which correspond to the insertion hole 212 and the threaded hole 213, respectively. The connector 230 includes a positioning pin 231 and a connecting bolt 232. The fixing cover plate 220 is connected to the mold base 210 via the connecting bolt 232, and the positioning pin 231 connects the through hole 222 and the insertion hole 212.
[0032] In some preferred embodiments, the elastic delivery portion 240 includes a support base plate 241, a delivery spring 242, and a receiving block 243. The support base plate 241 is detachably mounted on the lower surface of the placement mold base 210. The receiving block 243 is mounted on the support base plate 241 via the delivery spring 242, and the receiving block 243 is located in the positioning hole 211. The upper surface of the receiving block 243 is lower than the upper surface of the placement mold base 210 so that the nut blank 300 to be processed can be positioned by the positioning hole 211. The base plate 241 and the receiving block 243 are provided with corresponding discharge holes. The purpose of the discharge holes is to ensure that during the tapping process, wire debris and other debris will not accumulate in the positioning hole 211 and affect the accuracy of the operation (in general, during the tapping process, wire debris overflows from the top along the drill bit, but it is possible that some debris will block the positioning hole 211). At the same time, the elastic feed part 240 is detachably installed below the positioning hole 211 so that it can be cleared in time when the positioning hole 211 is blocked, ensuring the smooth progress of the processing operation.
[0033] Next, the operation steps in this embodiment will be described in detail to enable those skilled in the art to better understand this utility model:
[0034] Before operation, the placement mold base 210 of the nut processing fixture assembly 200 is first installed on the drilling machine fixture 100 and held and fixed by the drilling machine fixture 100. The nut blanks 300 to be processed are pressed one by one into the positioning holes 211 on the placement mold base 210 until the maximum capacity value that the positioning hole 211 can bear is reached. At this time, the nut blanks 300 to be processed tend to pop out of the positioning holes 211 under the elastic action of the elastic delivery part 240. Therefore, the fixing cover plate 220 needs to be installed on top of the placement mold base 210 and connected by the positioning pin 231 and the connecting bolt 232. When the fixing cover plate 220 is put on, the fixing cover plate 220 presses down the nut blanks 300 to be processed. The blank 300 is completely positioned in the positioning hole 211 and is held in place by the elastic feed part 240. It is assumed that the machining cutter on the drilling machine has been calibrated to the machining position, that is, the machining center of the machining cutter is located directly above the center of the nut blank 300 to be machined. The drill cutter is driven to perform a center tapping operation on the nut blank 300 to be machined. After completing the machining operation of one nut, the positioning pin 231 is pulled out and the connecting bolt 232 is loosened so that the fixing cover plate 220 can rotate around the connecting bolt 232 and open the positioning hole 211. The machined hexagonal nut is pushed out of the positioning hole 211 by the elastic feed part 240. The operator can easily take out the machined nut from the positioning hole 211 and continue to put in the nut blank 300 to be machined to repeat the above operation.
[0035] In summary, this utility model provides a nut processing fixture for stress corrosion testing of medium-thick plates in aerospace aluminum alloys. This fixture can quickly position and fix the nut blank to be processed. Furthermore, the fixture can directly expose the center to be processed of the nut blank, facilitating the drilling cutter's positioning and tapping on the drilling machine. This fixture eliminates the tedious steps of repeatedly disassembling and reassembling traditional fixtures to remove the processed nuts from the positioning holes. The fixture is equipped with an elastic ejector section that can directly eject the processed nuts, ensuring smooth and efficient processing. The nut processing fixture provided by this utility model has a simple structure, is easy to operate, and can process multiple nut blanks at once, improving production efficiency.
[0036] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.
Claims
1. A nut machining fixture for stress corrosion testing of medium-thick plates of aerospace aluminum alloy, comprising a drilling machine fixture (100), characterized in that, The drilling machine fixture (100) holds a nut processing fixture assembly (200); The nut processing fixture assembly (200) includes a placement mold base (210), a fixed cover plate (220), a connector (230), and an elastic delivery part (240). The placement mold base (210) has a through-hole (211) for placing the nut blank (300) to be processed. The elastic delivery part (240) is detachably installed on the lower surface of the placement mold base (210) and corresponds to the positioning hole (211). The fixed cover plate (220) has a processing hole (221) corresponding to the positioning hole (211). The fixed cover plate (220) is used to press the nut blank (300) to be processed into the positioning hole (211). The placement mold base (210) and the fixed cover plate (220) are connected by the connector (230).
2. The nut machining fixture for stress corrosion detection of medium-thick aerospace aluminum alloy plates according to claim 1, characterized in that, The positioning hole (211) is a hexagonal slot large enough to accommodate the nut blank (300) to be processed.
3. A nut machining fixture for stress corrosion detection of medium-thick aerospace aluminum alloy plates according to claim 2, characterized in that, The machining hole (221) is a circular groove, and the machining hole (221) is the inscribed circle of the positioning hole (211).
4. The nut machining fixture for stress corrosion detection of medium-thick aerospace aluminum alloy plates according to claim 1, characterized in that, The placement mold base (210) is provided with an insertion hole (212) and a threaded hole (213), the insertion hole (212) and the threaded hole (213) being located on opposite sides of the positioning hole (211).
5. A nut machining fixture for stress corrosion detection of medium-thick aerospace aluminum alloy plates according to claim 4, characterized in that, Each of the machining hole (221) has a through hole (222) on both sides, and the two through holes (222) are respectively arranged opposite to the insertion hole (212) and the threaded hole (213).
6. A nut machining fixture for stress corrosion detection of medium-thick aerospace aluminum alloy plates according to claim 5, characterized in that, The connector (230) includes a positioning pin (231) and a connecting bolt (232). The fixed cover plate (220) is connected to the placement mold base (210) by the connecting bolt (232). The positioning pin (231) connects the through hole (222) and the insertion hole (212).
7. A nut machining fixture for stress corrosion detection of medium-thick aerospace aluminum alloy plates according to claim 1, characterized in that, The elastic delivery part (240) includes a support base plate (241), a delivery spring (242), and a receiving block (243). The support base plate (241) is detachably installed on the lower surface of the placement mold base (210). The receiving block (243) is installed on the support base plate (241) by the delivery spring (242), and the receiving block (243) is located in the positioning hole (211). The upper surface of the receiving block (243) is lower than the upper surface of the placement mold base (210) so that the nut blank (300) to be processed can be positioned by the positioning hole (211).
8. A nut machining fixture for stress corrosion detection of medium-thick aerospace aluminum alloy plates according to claim 7, characterized in that, The supporting base plate (241) and the receiving block (243) are provided with corresponding discharge holes.