Universal vacuum tool for local vacuum

Abstract

The invention provides a general vacuum tool for local vacuum, which comprises a tool bottom plate and a special cushion block, the special cushion block is attached to the top of the tool bottom plate, and the part, needing vacuum machining, of a part is adsorbed on the special cushion block; a vacuum generating device is added on the basis of a general hole tool, a special cushion block is used as a medium, and a local vacuum state is formed among a general vacuum tool, the special cushion block and a part area needing local vacuum machining, so that local vacuum machining is carried out on the part area with the size difficult to guarantee or a variable area and the like; and the other areas are compressed and processed by using screws. The vacuum machining device has universality, can achieve machining of most parts with different structures and needing vacuum machining, can meet rapid development, can greatly improve the machining efficiency and can reduce the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machining tool design, and in particular to a local vacuum universal vacuum tool. Background Art

[0002] Vacuum fixture is a device that uses vacuum suction to adsorb and fix the workpiece. Its working principle is: first, the contact surface of the workpiece and the vacuum fixture is sealed with a sealing strip in the area where vacuum is required to ensure a good vacuum effect. Secondly, the air in the sealed area between the workpiece and the vacuum fixture is extracted through a vacuum generating device to form a vacuum state, so that the workpiece is firmly adsorbed on the vacuum fixture. The airflow in and out is controlled by manipulating the air extraction valve to achieve the adsorption and release of the workpiece. When the workpiece needs to be released, it is achieved by connecting the closed cavity to the atmosphere. Vacuum fixtures are particularly suitable for parts that are difficult to fix by traditional mechanical clamping methods, thin-walled parts, variable parts, etc., and have the advantages of non-contact, no damage, high adsorption force, and reduced part deformation.

[0003] However, the cycle for developing special vacuum tooling for parts with different structures, small batches, and parts that are difficult to process with ordinary tooling is too long, the cost of processing vacuum tooling is too high (about 100,000 each), and special vacuum tooling is not universal. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a local vacuum universal vacuum tooling, through which most of the parts with different structures and requiring vacuum processing can be processed, which can meet the needs of rapid development, greatly improve processing efficiency and reduce production costs.

[0005] The purpose of the present invention is achieved through the following technical solutions: A local vacuum universal vacuum tooling includes a tooling base plate and a special pad. The tooling base plate is a flat plate with a hollow interior. A vacuum exhaust valve for evacuating the interior of the tooling base plate is installed on the side of the tooling base plate; a plurality of first clamping holes with internal threads are provided on the top of the tooling base plate, and the inner wall of the first clamping hole is not connected to the interior of the tooling base plate; a plurality of first sealing grooves arranged vertically and horizontally and connected to each other are provided on the top of the tooling base plate; a plurality of first exhaust holes connected to the interior of the tooling base plate are provided on the top of the tooling base plate. The special pad is attached to the top of the tooling base plate, and an annular first sealing strip is provided between the special pad and the tooling base plate. The first sealing strip is filled in the first sealing groove corresponding to the special pad directly below the special pad, and there is at least one first exhaust hole and at least one first clamping hole in the tooling base plate area surrounded by the first sealing strip. At least one second evacuation hole connected to the first evacuation hole surrounded by the first sealing strip is provided on the top of the special pad block, and at least one second clamping hole aligned and connected to the first clamping hole surrounded by the first sealing strip is also provided. The second clamping hole is a countersunk hole provided with a locking bolt, and the lower end of the locking bolt is threadedly connected to the first clamping hole aligned and connected to the second clamping hole to press the special pad block to the top of the tooling base plate; an annular second sealing groove is provided on the top of the special pad block, and the second sealing groove is filled with a second sealing strip, and the second sealing strip surrounds the second evacuation hole and the second clamping hole therein.

[0006] The present invention adds a vacuum generating device to the universal hole system tooling, uses a special pad as a medium, and forms a local vacuum state between the universal vacuum tooling, the special pad and the area of ​​the part that needs local vacuum processing, thereby forming a local vacuum universal vacuum tooling that uses local vacuum processing for areas where the size of the part is difficult to guarantee or areas with variability, and uses screw compression processing for other areas. It has universality, can realize the processing of most parts with different structures that need vacuum processing, can meet rapid research and development, can greatly improve processing efficiency, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0008] Figure 1 It is a schematic structural diagram of the partial vacuum universal vacuum tooling of the present invention with the special pad installed.

[0009] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0010] Figure 3 It is a structural schematic diagram of the special cushion block described in the present invention.

[0011] Figure 4 This is a state diagram of the first sealing strip of the present invention being installed in the first sealing groove of the tooling bottom plate.

[0012] Figure 5 It is a schematic structural diagram of the partial vacuum universal vacuum tooling of the present invention with the special pad installed.

[0013] Figure 6 This is a schematic diagram of the parts being fixed on the vacuum tooling and special pads.

[0014] Figure 7 This is a schematic diagram of the parts being fixed with special pads.

[0015] As shown in the figure: 1-first clamping hole, 2-positioning hole, 3-vacuum exhaust valve, 4-tooling base plate, 5-positioning groove, 6-first sealing groove, 7-first exhaust hole, 8-special pad, 9-second exhaust hole, 10-second sealing groove, 11-second clamping hole, 12-parts requiring local vacuum processing area, 13-first sealing strip. DETAILED DESCRIPTION

[0016] The following is an explanation of the implementation of the present invention by specific specific embodiments. People familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0019] like Figures 1 to 5 As shown, this embodiment provides a partial vacuum universal vacuum tooling, including a tooling bottom plate 4 and a special pad 8.

[0020] like Figure 1 and Figure 2 As shown, the tooling base plate 4 is a rectangular flat plate with a hollow interior. A vacuum exhaust valve 3 for evacuating the interior of the tooling base plate 4 is installed on the side of the tooling base plate 4. The vacuum exhaust valve 3 is a valve for controlling the gas in and out of the tooling base plate 4. The vacuum exhaust valve 3 is a three-way valve, one end of which is connected to the interior of the tooling base plate 4, one end is connected to the outside, and the other end is connected to the exhaust pump. Rotating the vacuum exhaust valve 3 can connect any two ends. A plurality of first clamping holes 1 with internal threads (spacing is 50mm*50mm) are provided on the top of the tooling base plate 4. The first clamping holes 1 are arranged in a rectangular array on the top of the tooling base plate 4, and the inner wall of the first clamping hole 1 is not connected to the interior of the tooling base plate 4. A plurality of first sealing grooves 6 arranged vertically and horizontally and connected to each other are provided on the top of the tooling base plate 4. The first sealing grooves 6 are arranged in a rectangular array on the top of the tooling base plate 4; the first sealing grooves 6 are surrounded by a plurality of rectangular grid-shaped areas on the top of the tooling base plate 4, and a first clamping hole 1 is provided in each rectangular grid-shaped area. A plurality of first air extraction holes 7 connected to the inside of the tooling bottom plate 4 are provided on the top of the tooling bottom plate 4. The first air extraction holes 7 are also provided in a rectangular array on the top of the tooling bottom plate 4. The first air extraction holes 7 are provided in the first sealing groove 6 between two adjacent first pressing holes 1. At the same time, the first air extraction holes 7 are also provided at the intersection of the longitudinal first sealing groove 6 and the transverse first sealing groove 6. The first air extraction holes 7 are in a closed state when not in use. A more conventional method is to provide a plug in the first air extraction hole 7 for blocking the first air extraction hole 7 and being removed when in use. In addition, positioning holes 2 and positioning grooves 5 for positioning parts are provided on the tooling bottom plate 4. The parts are pressed and processed with screws except for the local vacuum processing area.

[0021] like Figure 5 As shown, the special pad 8 is attached to the top of the tooling bottom plate 4. Figure 4 As shown, an annular first sealing strip 13 is provided between the special pad 8 and the tooling base plate 4, and the first sealing strip 13 is filled in the first sealing groove 6 corresponding to the special pad 8 directly below the special pad 8. In the area of ​​the tooling base plate 4 surrounded by the first sealing strip 13, there is at least one first exhaust hole 7 and two or more first pressing holes 1.

[0022] At least one second evacuation hole 9 connected to the first evacuation hole 7 surrounded by the first sealing strip 13 is provided on the top of the special pad 8, and at least one second clamping hole 11 is also provided which is aligned and connected (concentric and connected) with the first clamping hole 1 surrounded by the first sealing strip 13. The second clamping hole 11 is a countersunk hole provided with a locking bolt, and the locking bolt is also a countersunk bolt. The lower end of the locking bolt is threadedly connected to the first clamping hole 1 aligned and connected with the second clamping hole 11, and the special pad 8 is pressed on the top of the tooling bottom plate. After the connection is completed, the top of the locking bolt is lower than the top of the special pad 8. An annular second sealing groove 10 is provided on the top of the special pad 8, and the second sealing groove 10 is filled with a second sealing strip. The second sealing strip surrounds the second evacuation hole 9 and the second clamping hole 11 therein. The area surrounded by the second sealing groove 10 and the second sealing strip is the area 12 of the part that requires local vacuum processing.

[0023] The first sealing strip 13 and the second sealing strip are both closed-loop annular rubber strips.

[0024] According to parts with different structures, special pads 8 are made for areas that require local vacuum processing.

[0025] Take frame parts as an example, see Figure 3 The special pad 8 shown is generally used for frame parts with large grid area and cannot be processed by screw compression, and the web thickness, deformation, etc. are difficult to guarantee. The special pad 8 has a rectangular structure, and a second evacuation hole 9 is provided on the top of the special pad 8, which is aligned with and connected to a first evacuation hole 7 surrounded by the first sealing groove 6. At the same time, two second clamping holes 11 are provided on the top of the special pad 8, which are aligned one by one with the two first clamping holes 1 surrounded by the first sealing groove 6.

[0026] Normally, when processing the first side of frame parts, there is a large margin on the web, and the size of the web is easy to guarantee, so there is no need to use vacuum processing. When fine milling the second side frame surface, partial vacuum processing is required. The processing steps are as follows: like Figure 4 As shown, the tooling base plate 4 is fixed on the machine tool workbench, and a special pad 8 is placed on the tooling base plate 4 to cover the corresponding first sealing groove 6 with the first sealing strip 13, so as to ensure that the first air exhaust hole 7 surrounded by the first sealing strip 13 on the tooling base plate 4 and only connected to the second air exhaust hole 9 is opened, and the other first air exhaust holes 7 are closed.

[0027] like Figure 5 As shown, the special gasket 8 is positioned and pressed onto the tooling base plate 4 using locking bolts. At this time, the first sealing strip 13 is located between the special gasket 8 and the tooling base plate 4 and is pressed. At the same time, the second air extraction hole 9 is aligned with the first air extraction hole 7 in the area surrounded by the first sealing strip 13 and is connected.

[0028] like Figure 6 As shown, the second sealing strip is fully covered in the second sealing groove 10 on the special pad 8, and the square area surrounded by the second sealing strip is the area 12 of the part that needs partial vacuum processing. The part is positioned through the positioning hole 2 or the positioning groove 5, and the part that needs partial vacuum processing is aligned with the area 12 of the special pad 8 that needs partial vacuum processing. The part is pressed with a clamping screw (and the screw of the first clamping hole 1) to make the part fit together with the special pad 8 (as shown in FIG. Figure 7 The figure shows the fitting surface between the web of the part and the special pad 8), that is, the special pad 8 is fixed between the tooling bottom plate 4 and the frame surface of the part that needs partial vacuum processing.

[0029] Afterwards, the vacuum exhaust valve 3 is connected to the exhaust pump through the conduit to exhaust air, and the vacuum exhaust valve 3 is adjusted so that the end connected to the exhaust pump is connected to the end connected to the tooling bottom plate 4 (while the end connected to the outside is closed), and the vacuum exhaust valve 3 is used to extract the air in the sealed area between the part and the tooling bottom plate 4 and the special cushion block 8 through the exhaust hole 9, thereby forming a vacuum state, so that the part is firmly adsorbed on the vacuum tooling, and the special cushion block and the general vacuum tooling and the local frame surface of the part are adsorbed, and the local vacuum processing of the part is realized. The airflow in and out is controlled by manipulating the vacuum exhaust valve 3 to realize the adsorption and release of the workpiece. Note that at this time, the remaining first exhaust holes 7 on the tooling are in a closed state, and only the first exhaust hole 7 in the local vacuum processing area is in an open state. Except for the local vacuum processing area, the other parts of the part are tightened with screws threadedly connected to the first tightening hole 1 outside the first sealing strip 13.

[0030] Other parts with different structures, such as curved parts, wall panel parts, and beam parts, can be made into special pads for local vacuum processing. The use of local vacuum processing methods to process parts and make special pads can greatly reduce the processing cycle and cost compared to making special vacuum tooling, which can greatly improve part processing efficiency and reduce production costs. Example

[0031] In order to achieve rapid vacuuming, this embodiment adds the following structure on the basis of embodiment 1.

[0032] The tooling bottom plate 4 is divided into a plurality of independent cavities, and the tooling bottom plate 4 is divided into a plurality of independent areas corresponding to the independent cavities one by one. Each independent cavity is connected to the first air extraction hole 7 in the independent area directly above it, and each independent cavity is connected to a vacuum exhaust valve 3. When evacuating, it is only necessary to find the independent area where the special pad 8 corresponding to the part that needs partial vacuum is located, and connect the vacuum pump air inlet to the vacuum exhaust valve 3 installed in the independent area through a conduit.

[0033] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0034] It should be noted that the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0035] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A general vacuum tool for partial vacuum, characterized in that: Including tooling base plate and special pads; The tooling bottom plate is a flat plate with a hollow interior, and a vacuum exhaust valve for evacuating the interior of the tooling bottom plate is installed on the side of the tooling bottom plate; a plurality of first pressing holes with internal threads are provided on the top of the tooling bottom plate; a plurality of first sealing grooves arranged vertically and horizontally and connected to each other are provided on the top of the tooling bottom plate; a plurality of first exhaust holes connected to the interior of the tooling bottom plate are provided on the top of the tooling bottom plate; The special pad is attached to the top of the tooling bottom plate, and an annular first sealing strip is provided between the special pad and the tooling bottom plate. The first sealing strip is filled in the first sealing groove corresponding to the special pad directly below the special pad, and at least one first air extraction hole and at least one first pressing hole are provided in the tooling bottom plate area surrounded by the first sealing strip; At least one second evacuation hole connected to the first evacuation hole surrounded by the first sealing strip is provided on the top of the special pad block, and at least one second clamping hole aligned and connected to the first clamping hole surrounded by the first sealing strip is also provided. The second clamping hole is a countersunk hole provided with a locking bolt, and the lower end of the locking bolt is threadedly connected to the first clamping hole aligned and connected to the second clamping hole to press the special pad block to the top of the tooling base plate; an annular second sealing groove is provided on the top of the special pad block, and the second sealing groove is filled with a second sealing strip, and the second sealing strip surrounds the second evacuation hole and the second clamping hole therein.

2. The local vacuum universal vacuum tooling according to claim 1, characterized in that: A second evacuation hole is provided on the top of the special pad block and is connected to a first evacuation hole surrounded by the first sealing groove.

3. The local vacuum universal vacuum tooling according to claim 1, characterized in that: The top of the special pad is provided with two second pressing holes which are aligned one by one with two of the first pressing holes surrounded by the first sealing groove.

4. The local vacuum universal vacuum tooling according to claim 1, characterized in that: The first pressing holes, the first sealing grooves and the first exhaust holes are respectively arranged in a rectangular array on the top of the tooling bottom plate.

5. The local vacuum universal vacuum tooling according to claim 4, characterized in that: The first sealing groove forms a plurality of rectangular grid-shaped areas on the top of the tooling bottom plate, and a first pressing hole is arranged in each rectangular grid-shaped area.

6. The local vacuum universal vacuum tooling according to claim 4, characterized in that: The first air extraction hole is arranged in the first sealing groove between two adjacent first pressing holes, and the first air extraction hole is also arranged at the intersection of the first sealing grooves.

7. The local vacuum universal vacuum tooling according to claim 1, characterized in that: A plug is provided in the first air extraction hole for blocking the first air extraction hole and can be pulled out during use.

8. The local vacuum universal vacuum tooling according to claim 1, characterized in that: The interior of the tooling base is divided into multiple independent cavities, and the tooling base is divided into multiple independent areas corresponding to the independent cavities one by one. Each independent cavity is connected to the first air extraction hole in the independent area directly above it, and each independent cavity is connected to a vacuum exhaust valve outside.

9. The local vacuum universal vacuum tooling according to claim 1, characterized in that: Positioning holes and positioning grooves for positioning parts are arranged on the tooling bottom plate to position the parts.

10. The local vacuum universal vacuum tooling according to claim 1, characterized in that: Except for the local vacuum processing area, other parts of the parts are compressed by screws threadedly connected to the first compression holes on the periphery of the first sealing strip.

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