Vacuum tool for machining curved surface part

Abstract

The utility model relates to the technical field of tooling equipment, and discloses a vacuum tooling for processing curved surface parts, which comprises a bottom plate, a thick plate sucker and a vacuum air extractor, the thick plate sucker is fixed on the bottom plate, at least one first air extracting hole is arranged on the thick plate sucker, a first sealing adsorption piece is arranged on the thick plate sucker around the first air extracting hole, and a second sealing adsorption piece is arranged on the thick plate sucker. The first sealing adsorption piece comprises a first air exhaust groove formed in the inner side, a first sealing groove and a rubber sealing strip embedded in the first sealing groove. The vacuum pumping device is communicated with the first pumping hole, and the first pumping hole is communicated with the first pumping groove; the first air exhaust hole, the first air exhaust groove and the first sealing groove are sealed to form a vacuum air exhaust channel between the thick plate suction cup and the curved-surface part, and the curved-surface part is adsorbed and fixed to the thick plate suction cup. The fixture has the advantages that large-radian curved-surface parts can be fixedly machined, the curved-surface parts can be conveniently clamped and disassembled after being formed, efficient machining work can be achieved, and therefore production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of tooling equipment technology, specifically a vacuum tooling for processing curved surface parts. Background Technology

[0002] In conventional CNC machine tool machining of aerospace curved surface parts, deformation is a common problem due to the raw materials and structure of the parts themselves. Furthermore, the shape of the curved parts necessitates traditional clamping methods with localized point contact, resulting in uneven stress during machining and making them prone to irregular deformation, ultimately leading to out-of-tolerance scrapping. Moreover, aerospace parts are high-value and costly, requiring higher machining precision than conventional parts; using traditional clamping methods is difficult, inefficient, and time-consuming. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a vacuum fixture for machining curved parts, which can effectively reduce the deformation of curved parts, ensure the machining quality of parts, and solve the problem that existing clamping methods use local point contact to clamp curved parts, causing uneven stress on the curved parts during machining and resulting in irregular deformation, leading to parts being scrapped due to exceeding tolerances.

[0004] To achieve the aforementioned goals of effectively reducing part deformation and ensuring part processing quality, this utility model provides the following technical solution: A vacuum tooling for processing curved parts includes a base plate, a thick plate suction cup adapted to the outline of the curved part, and a vacuum extraction device. The thick plate suction cup is fixed on the base plate and has at least one first extraction hole. A first sealing adsorption element is provided around the first extraction hole around the thick plate suction cup. The first sealing adsorption element includes a first extraction groove, a first sealing groove, and a rubber sealing strip embedded in the first sealing groove. The vacuum extraction device is connected to the first extraction hole, and the first extraction hole is connected to the first extraction groove. The first extraction hole, the first extraction groove, and the first sealing groove seal to form a vacuum extraction channel between the thick plate suction cup and the curved part, adsorbing and fixing the curved part on the thick plate suction cup.

[0005] Preferably, at least one set of side suction cups is also fixedly provided on the base plate. The side suction cups include a second sealing adsorption component, a first base, and a second base. The second sealing adsorption component includes a third air extraction hole, a third air extraction groove, and a fourth sealing groove from the inside out. The third air extraction groove is provided with a third air extraction hole, and the fourth sealing groove is provided around the outer ring of the third air extraction groove. A rubber sealing strip is embedded in the fourth sealing groove. The vacuum pumping device is connected to the third air extraction hole. The third air extraction hole, the third air extraction groove, the sealing strip, and the fourth sealing groove seal to form a vacuum pumping channel, and a sealed space is formed between the side suction cups and the curved parts.

[0006] Preferably, the system also includes a cover plate. The base plate has at least one second air extraction hole. A second air extraction groove and a second sealing groove are arranged around the second air extraction hole from the inside to the outside on the bottom of the base plate. The front of the base plate is the mounting surface. An air extraction groove and a third sealing groove are also arranged around the second air extraction hole from the inside to the outside. Rubber sealing strips are embedded in both the second sealing groove and the third sealing groove. The cover plate is fixed to the bottom of the base plate and matches the shape of the second sealing groove, so that a sealed space is formed in the second sealing groove. The cover plate, the second sealing groove, the second air extraction groove, the third sealing groove, the second air extraction hole, and the first air extraction hole seal together to form a vacuum extraction channel between the cover plate and the base plate.

[0007] Preferably, the rubber sealing strip and the corresponding sealing groove are interference fit.

[0008] Preferably, the rubber sealing strip is higher than the corresponding sealing groove, and the height of the excess part is 1 / 3 of the height of the rubber sealing strip.

[0009] Preferably, the first and second bases are provided with waist-shaped mounting holes that are adapted to the base plate, and the side suction cups are installed and fixed to the base plate by bolts.

[0010] Preferably, the vacuum pumping device includes a vacuum pump hose and a vacuum pump. The vacuum pump hose connects the pumping port to the vacuum pump. The vacuum pump is equipped with a digital vacuum gauge. The vacuum pump hose is made of polytetrafluoroethylene.

[0011] Preferably, the vacuum pumping device further includes a pressure gauge and a gas pipe for connecting the vacuum pump and the pressure gauge, as well as several tees and straight connectors.

[0012] Preferably, a pad assembly for fixing curved parts is also fixedly provided on the base plate. The pad assembly includes a number of first pads and a number of second pads. The curved parts to be processed and the pad assembly are fixed by bolts or magnetic attraction.

[0013] Compared with the prior art, this utility model provides a vacuum tooling for machining curved surface parts, which has the following beneficial effects:

[0014] This vacuum fixture for processing curved parts establishes an adsorption zone on a base plate. The curved part is placed on a thick plate suction cup and side suction cups on the base plate. After the curved part to be processed is pressed against the first sealing adsorption element, a vacuum pumping device evacuates air, creating negative pressure within the corresponding suction cup, thereby firmly adsorbing the curved part onto the suction cup. The vacuum fixture provided by this invention can effectively reduce part deformation, ensure part processing quality, and also reduce the risks associated with manual intervention and changing the clamping method. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the bottom structure of the base plate of this utility model;

[0017] Figure 3 This is a schematic diagram of the front structure of the base plate of this utility model;

[0018] Figure 4 This is a schematic diagram of the side suction cup structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the first pad 4 of this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the second pad 5 of this utility model;

[0021] Figure 7 This is a schematic diagram of the thick plate suction cup structure of this utility model;

[0022] Figure 8 This is a schematic diagram of the overall structure of the base plate of this utility model;

[0023] Figure 9 This is a schematic diagram of the overall clamping structure of this utility model.

[0024] In the diagram: 1-Base plate, 2-Thick plate suction cup, 3-Side suction cup, 4-First pad, 5-Second pad, 6-Second suction groove, 7-Second suction hole, 8-Second sealing groove, 12-Third sealing groove, 13-First base, 14-Second base, 15-Second sealing adsorption component, 16-Third suction groove, 17-Fourth sealing groove, 18-Third suction hole, 19-Threaded sleeve mounting hole, 20-First locking hole, 21-Second locking hole, 22-Positioning hole, 23-Bushing mounting hole, 24-Third locking hole, 25-First sealing groove, 26-First suction groove, 27-First suction hole, 29-Cover plate, 31-Bushing, 32-Positioning pin, 33-Wire threaded sleeve, 34-Vacuum suction device. Detailed Implementation

[0025] 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.

[0026] like Figure 1-9As shown, a vacuum fixture for machining curved parts includes: a base plate 1, a cover plate 29, a thick plate suction cup 2, a side suction cup 3, and a vacuum extraction device 34. The base plate 1 has several second extraction holes 7, which are through holes. Around the second extraction holes 7, a second extraction groove 6 and a second sealing groove 8 are arranged from the inside out around the bottom of the base plate 1. The front of the base plate 1 is the mounting surface, and extraction grooves and a third sealing groove 12 are also arranged from the inside out around the second extraction holes 7. Rubber sealing strips are fitted into both the second sealing groove 8 and the third sealing groove 12. The rubber sealing strips are interference-fitted with the second sealing groove 8 and the third sealing groove 12, and the height of the excess portion is 1 / 3 of the height of the sealing strip. The cover plate 29 is fitted to the shape of the second sealing groove 8 at the bottom of the base plate 1 and is fixed to the bottom of the base plate 1 by several bolts, forming a sealed space within the second sealing groove 8.

[0027] The thick plate suction cup 2 is adapted to the contour of the curved part and is fixed to the mounting surface of the base plate 1 by several bolts. The thick plate suction cup 2 is provided with several first suction holes 27, which are through holes. The thick plate suction cup 2 is surrounded by several first suction holes 27 and is provided with first sealing adsorption components. The first sealing adsorption components include a first suction groove 26, a first sealing groove 25 and a rubber sealing strip embedded in the first sealing groove 25. The rubber sealing strip is interference-fitted with the first sealing groove 25 and is higher than the first sealing groove 25, with the height of the excess part being 1 / 3 of the height of the sealing strip. The first suction holes 27 on the thick plate suction cup 2 are respectively connected to the first suction groove 26, and the first suction holes 27 are also provided in a one-to-one correspondence with the second suction holes 7 on the base plate 1. The cover plate 29, the second sealing groove 8, the second suction groove 6, the second suction hole 7, the third sealing groove 12, and the first suction hole 27 seal to form a vacuum suction channel between the cover plate 29 and the base plate 1; the first suction hole 27, the first suction groove 26, and the first sealing groove 25 seal to form a vacuum suction channel between the thick plate suction cup 2 and the curved part; the base plate 1, the thick plate suction cup 2, and the curved part form a sealed space, which forms a negative pressure under suction conditions, and can achieve a vacuum state.

[0028] Several sets of side suction cups 3 are also fixedly installed on the base plate 1. The side suction cups 3 include a second sealing adsorption component 15, a first base 13, and a second base 14. The second sealing adsorption component 15 includes a third air extraction hole 18, a third air extraction groove 16, and a fourth sealing groove 17 from the inside out. The third air extraction groove 16 is provided with the third air extraction hole 18, and the fourth sealing groove 17 is provided around the outer ring of the third air extraction groove 16. A rubber sealing strip is embedded in the fourth sealing groove 17. The rubber sealing strip and the fourth sealing groove 17 are interference fit, and the rubber sealing strip is higher than the fourth sealing groove 17, with the height of the excess part being 1 / 3 of the height of the sealing strip. The third air extraction hole 18, the third air extraction groove 16, the sealing strip, and the fourth sealing groove 17 seal to form a vacuum air extraction channel. The side suction cups 3 and the curved parts form a sealed space, and a negative pressure is formed in the air extraction state, which can achieve a vacuum state. The first base 13 and the second base 14 are provided with waist-shaped mounting holes that are compatible with the base plate 1. The side suction cup 3 is installed and fixed on the base plate 1 by bolts. The design of the waist-shaped mounting holes can more flexibly adapt to the shape structure of different curved parts, so that the side suction cup 3 can better adsorb the curved parts to be processed.

[0029] The vacuum pumping device 34 includes a vacuum pump hose and a vacuum pump. The first suction port 27 and the third suction port 18 are connected to the vacuum pump through the vacuum pump hose. During continuous vacuuming, the side suction cup 3 can also firmly adsorb the curved parts, preventing the parts from shaking and causing them to be scrapped due to exceeding tolerances. The vacuum pumping device 34 also includes a pressure gauge, a gas pipe for connecting the vacuum pump and the pressure gauge, and several tee and straight connectors. The vacuum pump is equipped with a digital vacuum gauge, and the vacuum pump hose is made of PTFE. The reason for choosing PTFE vacuum pump hose to connect to the vacuum pump is that the working principle of the vacuum pump is negative pressure adsorption, which requires the connecting pipe to have a certain strength. PTFE vacuum pump hose has excellent chemical stability, corrosion resistance, sealing performance, high lubricity and non-stick properties, electrical insulation, and good anti-aging resistance, and its material properties meet the usage requirements.

[0030] A pad assembly for fixing curved surface part blanks is also fixedly installed on the base plate 1. The pad assembly includes several first pads 4 and several second pads 5. The bottom of the first pads 4 and the second pads 5 are provided with several second locking holes 21 and positioning holes 22. The positioning holes 22 match the holes on the base plate 1 for positioning. The first pads 4 and the second pads 5 are locked and fixed on the base plate 1 by bolts cooperating with the second locking holes 21. The top of the first pad 4 is provided with a threaded sleeve mounting hole 19 for installing a wire threaded sleeve 33 and a first locking hole 20 arranged perpendicular to the threaded sleeve mounting hole 19. The threaded sleeve mounting hole 19 and the wire threaded sleeve 33 are interference fit. The top of the second pad 5 is provided with a bushing mounting hole 23 for installing a bushing 31 and a third locking hole 24 arranged perpendicular to the bushing mounting hole 23. The bushing mounting hole 23 and the bushing 31 are interference fit. The curved part is provided with positioning holes that fit the bushing 31 and mounting holes that fit the wire thread insert 33. The curved part is quickly clamped and positioned onto the base plate 1 by the cooperation of the positioning pin 32 with the bushing 31 and the wire thread insert 33, and then quickly locked and fixed by the first locking hole 20 and the third locking hole 24, saving time and improving work efficiency. The clamping method between the curved part and the pad assembly can be bolted or magnetic. For example, magnetic components can be provided on the curved part blank and the clamping holes of the part to achieve the same fixing effect.

[0031] The working principle of this utility model is as follows: When machining curved parts, the base plate 1 of the vacuum fixture of this utility model is connected to the machine tool worktable, and the curved part to be machined is clamped on the vacuum fixture. When the vacuum pumping device 34 is working, a negative pressure is generated in the sealing area inside the thick plate suction cup 2 and the side suction cup 3. The curved part is tightly adsorbed by the first sealing adsorption element on the thick plate suction cup 2 and the second sealing adsorption element on the side suction cup 3. In the technical solution of this utility model, the curved part to be machined is combined with the thick plate suction cup and the side suction cup by vacuum adsorption and screw locking to ensure the stability of the part during the machining process.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum tooling for machining a curved part, characterized in that, include: The base plate (1), the thick plate suction cup (2) adapted to the outline of the curved part, and the vacuum pumping device (34) are provided. The thick plate suction cup (2) is fixed on the base plate (1). The thick plate suction cup (2) is provided with at least one first suction hole (27). The thick plate suction cup (2) is provided with a first sealing adsorption component around the first suction hole (27). The first sealing adsorption component includes a first suction groove (26) and a first sealing groove (25) provided on the inner side, and a rubber sealing strip embedded in the first sealing groove (25). The vacuum pumping device (34) is connected to the first suction hole (27), and the first suction hole (27) is connected to the first suction groove (26). The first suction hole (27), the first suction groove (26), and the first sealing groove (25) seal to form a vacuum pumping channel between the thick plate suction cup (2) and the curved part, adsorbing and fixing the curved part on the thick plate suction cup (2).

2. A vacuum tooling for machining a curved part as claimed in claim 1, characterized in that, At least one set of side suction cups (3) are also fixedly installed on the base plate (1). The side suction cups (3) include a second sealing suction component (15), a first base (13), and a second base (14). The second sealing suction component (15) includes a third air extraction hole (18), a third air extraction groove (16), and a fourth sealing groove (17) from the inside out. The third air extraction groove (16) is provided with a third air extraction hole (18). The third air extraction groove (16) is provided with a fourth sealing groove (17) on its outer ring. A rubber sealing strip is embedded in the fourth sealing groove (17). The vacuum pumping device (34) is connected to the third air extraction hole (18). The third air extraction hole (18), the third air extraction groove (16), the sealing strip, and the fourth sealing groove (17) form a vacuum pumping channel. The side suction cups (3) and the curved parts form a sealed space.

3. A vacuum tooling for machining a curved part as claimed in claim 2, wherein, It also includes a cover plate (29), and the bottom plate (1) is provided with at least one second air extraction hole (7). The bottom of the bottom plate (1) is provided with a second air extraction groove (6) and a second sealing groove (8) from the inside to the outside around the second air extraction hole (7). The front of the bottom plate (1) is the mounting surface, and an air extraction groove and a third sealing groove (12) are also provided from the inside to the outside around the second air extraction hole (7). Rubber sealing strips are embedded in the second sealing groove (8) and the third sealing groove (12). The cover plate (29) is fixed to the bottom of the bottom plate (1) and matches the shape of the second sealing groove (8) so that a sealed space is formed in the second sealing groove (8). The cover plate (29), the second sealing groove (8), the second air extraction groove (6), the third sealing groove (12), the second air extraction hole (7) and the first air extraction hole (27) seal to form a vacuum air extraction channel between the cover plate (29) and the bottom plate (1).

4. The vacuum tooling for machining a curved part of any one of claims 1-3, wherein, The rubber sealing strip and the corresponding sealing groove are interference fit.

5. A vacuum tooling for machining a curved part as claimed in claim 4, wherein, The rubber sealing strip is higher than the corresponding sealing groove, and the height of the excess part is 1 / 3 of the height of the rubber sealing strip.

6. The vacuum tooling for machining curved surface parts as described in claim 2, characterized in that, The first base (13) and the second base (14) are provided with waist-shaped mounting holes that are compatible with the base plate (1), and the side suction cup (3) is installed and fixed on the base plate (1) by bolts.

7. A vacuum tooling for machining a curved part as defined in claim 1, wherein, The vacuum pumping device (34) includes a vacuum pump hose and a vacuum pump. The vacuum pump hose connects the pumping port to the vacuum pump. The vacuum pump is equipped with a digital vacuum gauge. The vacuum pump hose is made of polytetrafluoroethylene.

8. A vacuum tooling for machining a curved part as claimed in claim 7, wherein, The vacuum pumping device (34) also includes a pressure gauge and a gas pipe for connecting the vacuum pump and the pressure gauge, as well as several tees and straight connectors.

9. A vacuum tooling for machining a curved part as defined in claim 1, wherein, The base plate (1) is also fixedly provided with a pad assembly for fixing curved parts. The pad assembly includes several first pads (4) and several second pads (5). The curved parts to be processed and the pad assembly are fixed by bolts or magnetic clamping.

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