Analog intersection hole expansion hinge processing clamp

Abstract

The present application belongs to the field of processing equipment, and provides a simulation intersection hole expanding hinge processing clamp, which comprises a bottom plate and a mounting assembly, a threaded hole is arranged on a drill jig, a portable processing equipment is fixed on the drill jig by means of a draw bolt, a precise bushing hole is arranged at the center of the drill jig, and the drill jig is positioned in cooperation with a drill sleeve of the portable processing equipment. The mounting seat comprises a base and a pressing part, a workpiece is pressed by means of a bolt, a groove is formed in the mounting seat, and the workpiece is fixed by means of a groove piece, so that the workpiece cannot rotate during processing. The wedge block plays an auxiliary positioning role, the drill jig plate, the mounting seat and the bottom plate are tightly contacted by means of a bolt pressing, and the positioning accuracy is ensured. The present application is aimed at intersection hole expanding hinge processing, effectively simulates the working condition of experimental intersection expanding hinge processing, the clamp can meet the requirements of the portable processing equipment during processing, and ensures that the coaxiality and the accuracy meet the standards.

Description

Technical Field

[0001] This invention belongs to the field of processing equipment, and specifically relates to a fixture for simulating the expansion and reaming of intersection holes. Background Technology

[0002] High-strength titanium alloys and high-strength steels possess numerous excellent physical and mechanical properties, making them widely used in aerospace applications for components subjected to significant alternating loads. Secondary machining is increasingly common in these applications, particularly during the assembly and connection of composite material parts, inevitably requiring extensive hole machining. Reaming involves using a reamer to further process already drilled, cast, or forged holes to enlarge the diameter and improve machining quality. Boring is the finishing process for the reamed workpiece. Intersection holes, in particular, are used for connecting key components, thus demanding extremely high hole quality. However, the varying material types of the connecting components at different intersection holes can affect the machining performance of the equipment. Furthermore, the machining process requires the establishment of appropriate machining techniques to meet the positional accuracy, dimensional accuracy, and surface quality requirements of the intersection holes, all of which contribute to the challenges of machining intersection holes.

[0003] Portable machining equipment is commonly used in the machining of high-end aerospace equipment. To verify whether the reaming and boring effects of portable machining equipment meet assembly requirements, extensive experimental testing and hole quality inspection are necessary. However, due to the characteristics of intersection holes, direct application in on-site machining is very difficult and costly, making it impractical. Therefore, before formal application in the machining field, it is necessary to simulate the corresponding machining conditions and states in the laboratory, and simultaneously machine two large-diameter workpieces using reaming and boring methods to ensure that their coaxiality, hole diameter accuracy, and surface roughness meet design requirements. In addition, because the heat generated during the machining of titanium alloys greatly affects the hole quality, it is also necessary to ensure that appropriate cutting fluid is used for cooling, lubrication, and cleaning during boring to prevent built-up edge formation and timely chip removal. Therefore, the machining fixture for intersection holes needs to be able to both oil the tool for cooling during machining and provide sufficient space for chip removal from the workpiece.

[0004] Currently, He Jian et al. of Ningbo Aux Electric Co., Ltd. have invented a slanted hole machining fixture, patent number CN201920647195.7. This slanted hole machining fixture is used to mount workpieces that need to be machined with slanted holes, and the workpieces to be machined have machining surfaces for machining slanted holes. However, this device cannot machine two workpieces simultaneously, and it does not take into account issues such as vibration, chatter, and chip generation during machining. Accuracy is also difficult to guarantee, it is not suitable for machining large-sized workpieces, and stability is difficult to guarantee, thus having certain limitations. Additionally, Tang Tingting et al. of China Aero Engine Corporation have invented a boring fixture, patent number CN 110774027 A. This fixture can quickly mount workpieces and ensure uniform force on the workpiece, but it has limitations on the workpiece and cannot simulate some special working conditions.

[0005] In summary, in order to meet the experimental simulation conditions for machining the intersection holes of connecting components in high-end aerospace equipment, it is necessary to design a fixture that can ensure the coaxiality of the machined workpiece, can be lubricated at any time, has a chip removal port, and has high precision and stability for the expanded hinge workpiece. Summary of the Invention

[0006] The purpose of this invention is to design a simulated intersection hole reaming fixture to solve the problems existing in the prior art. By changing the position of the mounting components, different working conditions can be simulated to position and fix the workpiece, enabling it to be processed accurately and stably.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A fixture for simulating the expansion and reaming of a hole at an intersection includes a base plate 5 and multiple mounting components mounted on the base plate 5. The multiple mounting components have the same structure but different thicknesses.

[0009] The base plate 5 is a square base. One side of the base plate 5 is provided with a square boss 5a with a scale on the upper surface of the square boss 5a. The other side of the base plate 5 is provided with a right trapezoidal boss 5c with a slope on the side adjacent to the square boss 5a. The front side of the base plate 5 is provided with a positioning post 5b, which is located between the square boss 5a and the right trapezoidal boss 5c and in front of them.

[0010] The drill jig 401 is positioned by the square boss 5a and the positioning post 5b on the base plate 5, and is fixed to the base plate 5 by bolts; the second wedge block 404 is set between the drill jig 401 and the right-angled trapezoidal boss 5c, and is fixed to the base plate 5 by bolts, so that the drill jig 401 fits tightly against the square boss 5a; the clamping bolt A402 and the clamping bolt B403 are aligned and screwed into the threaded hole on the front side of the drill jig 401.

[0011] The mounting components include a clamping element 101, a slotted clip 102, a rubber ring 103, a mounting base bottom 104, a first wedge block 105, and an auxiliary gasket 106;

[0012] The upper center of the bottom 104 of the mounting base is a semi-circular groove with a semi-circular boss 104a and a semi-circular recess. The front side of the bottom 104 of the mounting base is provided with a card mounting groove 104b. On the other side of the bottom 104 of the mounting base, above the semi-circular recess, there is a square groove 104c. The bottom 104 of the mounting base is selected according to the scale on the square boss 5a and fits against the square boss 5a. It is connected to the base plate 5 by bolts.

[0013] The clamping member 101 is positioned by the square groove 104c, and the clamping member 101 is fixed to the bottom 104 of the mounting base by bolts; the clamping member 101 is V-shaped.

[0014] The slotted card 102 is fixed to the card mounting slot 104b by bolts;

[0015] Rubber ring 103 is installed in a semi-circular groove on the bottom 104 of the mounting base;

[0016] The first wedge block 105 is positioned between the bottom 104 of the mounting base and the right-angled trapezoidal boss 5c, and the bottom 104 of the mounting base is tightly fitted to the positioning surface by bolts.

[0017] The auxiliary gasket 106 is installed between the mounting assembly and the square boss 5a.

[0018] The beneficial effects of this invention are:

[0019] The present invention provides a simulated intersection hole reaming fixture. By setting a square boss and fixing it with bolts and wedges, it achieves precise positioning. By setting a slotted card and a V-shaped clamping component in the mounting assembly, and setting the diameter of the large mounting hole on the drill jig to be larger than the diameter of the test piece, the test piece is easy to install and disassemble and is subjected to less stress, thus effectively simulating the working conditions of the intersection hole and preventing deformation after processing.

[0020] The simulated intersection hole reaming fixture of the present invention allows multiple mounting components to fit against the square boss 5a and the positioning post, ensuring that each test piece is coaxial with the spindle of the drilling equipment; by changing the relative position of the mounting components, the actual working conditions can be simulated; by installing auxiliary shims 106 between the mounting components and the square boss 5a, and reinstalling them through the above steps, the eccentricity between the holes of the workpiece in the actual working conditions can be simulated. Attached Figure Description

[0021] Figure 1 This is a tooling drawing of a fixture for simulating the reaming of a hole at a simulated intersection according to the present invention;

[0022] Figure 2 This is an exploded view of a fixture for simulating the reaming of a hole at an intersection according to the present invention;

[0023] Figure 3 This is a schematic diagram of the base plate mechanism of a simulated intersection hole reaming fixture according to the present invention;

[0024] Figure 4 This is a schematic diagram of the bottom mechanism of the mounting base of a fixture for simulating the expansion and reaming of a hole according to the present invention;

[0025] Figure 5 This is a prototype drawing of a fixture for simulating the reaming of a hole at an intersection according to the present invention;

[0026] Figure 6 This is a schematic diagram of the working condition of a simulated intersection hole reaming fixture according to the present invention, wherein (a) is a schematic diagram of the mounting components, and (b) is a schematic diagram of the mating of the wing joint and the fuselage joint;

[0027] In the diagram, 1 is the first mounting component, 2 is the second mounting component, 3 is the third mounting component, 4 is the fourth mounting component, 101 is the clamping part, 102 is the slotted card, 103 is the rubber ring, 104 is the bottom of the mounting base, 105 is the first wedge block, 106 is the auxiliary gasket, 401 is the drill jig, 402 is the clamping bolt A, 403 is the clamping bolt B, 404 is the second wedge block, 5 is the base plate, 6 is the drill sleeve, 7 is the wing joint, 8 is the fuselage joint, 5a is the square boss, 5b is the positioning post, 5c is the right-angled trapezoidal boss, 104a is the semi-circular boss, 104b is the card mounting slot, and 104c is the square slot. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0029] Specific implementation methods are as follows, please refer to Figure 1-6 A fixture and tooling for simulating the expansion and reaming of a hole at an intersection includes: a base plate and multiple mounting components, specifically a clamping component 101, a slotted clip 102, a rubber ring 103, a mounting base bottom 104, a first wedge block 105, an auxiliary gasket 106, a drill jig 401, clamping bolts A402 and B403, a second wedge block 404, a base plate 5, a drill sleeve 6, an airfoil joint 7, and a fuselage joint 8;

[0030] Since the structures and working methods of the various mounting components are similar, differing only in thickness, mounting component 1 will be used as an example for explanation.

[0031] The drill jig 401 is vertically mounted on the upper surface of the base plate 5 and positioned by a square boss 5a and a positioning post 5b. Bolts pass through the drill jig 401 and connect it to the threaded hole on the base plate 5. The second wedge block 404 is positioned between the drill jig 401 and the right-angled trapezoidal boss 5c. Bolts pass through the wedge block 402 and connect it to the threaded hole on the base plate 5, providing lateral force to ensure that the drill jig 401 and the square boss 5a fit tightly together, achieving high positioning accuracy. The clamping bolts A402 and B403 are aligned and screwed into the threaded hole on the front side of the drill jig 401, providing conditions for the subsequent installation of the drill sleeve 6.

[0032] The slotted card 102 is set in the card mounting slot 104b. The bolt passes through the slotted card 102 and connects to the threaded hole in the card mounting slot 104b. The rubber ring 103 is set in the semi-circular groove of the semi-circular boss 104a, which can increase the stability of the test piece. The mounting base bottom 104 is vertically set on the upper surface of the base plate 5 and is positioned by the square boss 5a. The bolt passes through the mounting base bottom 104 and connects to the threaded hole on the base plate 5. The first wedge block 105 is set between the mounting base bottom 104 and the right-angled trapezoidal boss 5c. The bolt passes through the first wedge block 105 and connects to the threaded hole on the base plate 5, so that the mounting base bottom 104 and the square boss 5a fit tightly and achieve high positioning accuracy. In this way, the left and right positions of all mounting components are determined by the square boss 5a, which can ensure the accurate position of the tool and all test pieces. The clamping element 101 is positioned above the bottom 104 of the mounting base and is located by the square groove 104c. Bolts pass through the clamping element 101 and are connected to the threaded holes on the bottom 104 of the mounting base. The same applies to mounting components 2 and 3.

[0033] In actual work, first determine the processing conditions, and then place the workpieces at the corresponding scales according to the scales on the square boss 5a and the relative positions of the workpieces in the processing conditions. Then fix them in place. By changing the positions of each mounting component, different processing conditions can be simulated.

[0034] When installing the test piece, loosen the bolts to expand the space between the clamping member 101 and the bottom 104 of the mounting base. Then, place the test piece into the mounting assembly 1 through the mounting hole in the middle of the drill jig 401. The test piece is positioned by the semi-circular boss 104a and the slotted clip 102. Finally, tighten the bolts to make the clamping member 101 symmetrically clamp the test piece at two points. To remove the test piece, simply repeat the reverse steps. This allows for quick replacement of the test piece. At this time, the mating of the slotted clip 102 with the surface of the test piece can resist torque and limit the rotation of the test piece. Therefore, the clamping member 101 does not need to apply excessive clamping force to ensure the stability of the test piece and reduce deformation. At the same time, the clamping member uses two-point clamping, which also reduces the deformation of the test piece.

[0035] After all test pieces are installed, insert the drill sleeve 6 of the drilling equipment and fix it with clamping bolts A402 and B403; at this point, the installation is complete and machining can begin.

[0036] A method for simulating the working conditions of a fixture for reaming intersecting holes is presented. The actual machining involves two main types of workpieces: wing connector 7, a fork-shaped workpiece with two lugs; and fuselage connector 8, which can be inserted into the two lugs of wing connector 7, with a certain degree of eccentricity between the holes of wing connector 7 and fuselage connector 8. The specific working conditions include three scenarios:

[0037] 1. The wing joint 7 is machined separately, and the wing joint 7 is a certain distance away from the drill jig 4;

[0038] 2. The machine body joint 8 is machined separately, and there is a large backlash at the tool exit.

[0039] 3. The fuselage joint 8 is inserted into the fuselage joint 7 and processed simultaneously. There are gaps between the fuselage joint 8 and both sides of the wing joint 7.

[0040] The specific steps are as follows:

[0041] First, install the fourth installation component 4 into the fixed position;

[0042] Then, based on the actual working conditions, select the type and quantity of the remaining installation components, determine the position of the installation components, and position and fix them using the square boss 5a, the right-angled trapezoidal boss 5c, the first wedge block 105 and bolts. Then install the test piece in the remaining installation components. At this time, in order to simulate the eccentricity between the wing joint 7 and the various holes of the fuselage nose 8, remove the corresponding installation components and place the auxiliary shim 106 with the corresponding eccentricity thickness between it and the square boss 5a. Then reinstall the corresponding installation components.

[0043] Specifically, for working condition 1, the third mounting component 3 is installed at a certain distance from the fourth mounting component 4, the first mounting component 1 is installed at a certain distance behind the third mounting component 3, the test piece is then installed, and finally the eccentricity simulation work is carried out.

[0044] For condition 2, the second mounting component 2 is installed at a certain distance behind the first mounting component 1, the test piece is then installed, and finally the eccentricity simulation is performed.

[0045] For condition 3, first perform the operation for condition 1, then install the second mounting component 2 between the first mounting component 1 and the third mounting component 3, ensuring a gap of 0.5-2mm between the second mounting component 2 and either the first or third mounting component 3, then install the test piece, and finally perform eccentricity simulation.

Claims

1. A simulated intersection hole flanging process fixture, characterized by, The simulation intersection hole expanding hinge processing clamp comprises a bottom plate (5) and a plurality of mounting assemblies mounted on the bottom plate (5), the mounting assemblies are the same in structure and different in thickness; The bottom plate (5) is a square base, one side of the bottom plate (5) is provided with a square boss (5a) in cross section, and the upper surface of the square boss (5a) is provided with a scale; the other side of the bottom plate (5) is provided with a right trapezoidal boss (5c) in cross section, and the side surface adjacent to the square boss (5a) is a bevel; the front side of the bottom plate (5) is provided with a positioning column (5b) located between the square boss (5a) and the right trapezoidal boss (5c) and in the middle of the front side of the square boss (5a) and the right trapezoidal boss (5c); The drill jig (401) is positioned through the square boss (5a) and the positioning column (5b) on the bottom plate (5) and is fixed on the bottom plate (5) through bolts; the second wedge block (404) is arranged between the drill jig (401) and the right trapezoidal boss (5c) and is fixed on the bottom plate (5) through bolts, so that the drill jig (401) is tightly attached to the square boss (5a); the pressing bolt A (402) and the pressing bolt B (403) are aligned and screwed into the threaded holes on the front side of the drill jig (401); The mounting assembly comprises a pressing part (101), a notched card (102), a rubber ring (103), a mounting seat bottom (104) and a first wedge block (105); The mounting seat bottom (104) is provided with a semicircular boss 104a and a semicircular groove in the semicircular notch in the middle of the mounting seat bottom (104), the mounting seat bottom (104) is provided with a card mounting groove (104b) on the front side, and the mounting seat bottom (104) is provided with a square groove (104c) on the other side and above the semicircular groove and on both sides of the semicircular groove; the mounting seat bottom (104) is attached to the square boss (5a) by selecting the corresponding position according to the scale on the square boss (5a) and is connected to the bottom plate (5) through bolts; The pressing part (101) is positioned through the square groove (104c) and is fixed to the mounting seat bottom (104) through bolts; The notched card (102) is fixed on the card mounting groove (104b) through bolts; The rubber ring (103) is installed in the semicircular groove on the mounting seat bottom (104); The first wedge block (105) is arranged between the mounting seat bottom (104) and the right trapezoidal boss (5c) and tightly attaches the mounting seat bottom (104) to the positioning surface through bolts; The auxiliary gasket (106) is installed between the mounting assembly and the square boss (5a).

2. The simulated intersection hole expansion swaging fixture of claim 1, wherein, The pressing part (101) is V-shaped.

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