Positioning tool of thin-wall cabin and machining method of electromachining groove of thin-wall cabin

Abstract

The invention relates to a positioning tool of a thin-wall cabin and a machining method of an electromachining groove of the thin-wall cabin. The positioning tool comprises a positioning block and a fork-shaped pressing block, the outer end face of the positioning block is provided with a first step face, and the positioning block is fixedly connected with the base body part; the fork-shaped pressing block comprises a base body part and a plurality of crimping parts, a to-be-machined space is defined by the multiple crimping parts and the base body part, and the outer end face of each crimping part is provided with a second step face; a first center hole is formed in the middle of the thin-wall cabin in an extending mode, one end of the thin-wall cabin is provided with a to-be-machined end face, the to-be-machined end face is used for machining the electromachining groove, and when the positioning block is partially located in the first center hole, the two opposite ends of the thin-wall cabin abut against the first step face and the multiple second step faces correspondingly. The to-be-machined end face is located in the to-be-machined space. In this way, the problem that the detection accuracy is poor after the thin-wall cabin is machined and taken down due to the fact that an existing thin-wall cabin is tilted in the clamping process due to uneven stress in the groove electromachining process is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of positioning tooling for thin-walled cabins, and in particular to a positioning tooling for thin-walled cabins and a method for machining an electro-machined groove for a thin-walled cabin. Background Art

[0002] The thin-walled cabin is an important part of the rudder system. The material of the thin-walled cabin is 2A12-T4 aluminum alloy rod. The structure is a thin-walled cylindrical type with an outer diameter of φ90mm and a wall thickness of 2.5mm at the thinnest point. Figure 1 As shown, the width The groove is an important characteristic dimension. The design requires that the symmetry between the groove and the outer circle reference is 0.03. Since the root of the groove is in a root-clearing state and is only 1mm deep relative to the inner hole wall, the groove is machined by electrospark.

[0003] When the slot is electrospark machined, in order to determine the direction and the center position of the thin-walled cabin, a fixed cytoplasm is designed and manufactured to clamp the φ90 outer circle, and a φ4.5H7mm hole in the GG view is used as the directional hole for electrospark machining. Since the fixed cell has no elastic properties, two screw holes are made on the circumference of the fixed cell, and the screws are used to connect and position the fixed cell with the thin-walled cabin. However, due to the thin wall thickness of the thin-walled cabin, tightening the two screws will easily cause the cabin to deform. At the same time, since the wall thickness of the orientation part is only 3.75mm, and the outer diameter of the thin-walled cabin is large, the wall thickness of 3.75mm is used for orientation, which makes the thin-walled cabin difficult to process during electrical machining. Uneven force is prone to occur when the groove is machined, which leads to warping during clamping, and then the accuracy of the size and symmetry of the groove after the thin-walled cabin is removed after processing is poor, resulting in a low pass rate for the processed thin-walled cabin. Summary of the invention

[0004] In order to solve the problem that uneven force is applied to the existing thin-walled cabin body during the electro-machining groove process, resulting in warping during clamping, which leads to poor detection accuracy after the thin-walled cabin body is removed after processing, the present invention provides a positioning tool for a thin-walled cabin body and a method for machining an electro-machining groove for a thin-walled cabin body.

[0005] In a first aspect, the present invention provides a positioning fixture for a thin-walled cabin; the positioning fixture comprises a positioning block and a fork-shaped pressing block, wherein, along the height direction, an outer end surface of the positioning block is formed with a first step, the first step has a first step surface facing the side where the fork-shaped pressing block is located, and the positioning block is provided with a first assembly structure on the side where the fork-shaped pressing block is located;

[0006] The fork-shaped pressing block comprises a base portion, and a plurality of crimping portions extending along one side of the base portion, the plurality of crimping portions are symmetrically arranged along the circumference of the base portion, a gap is provided between two adjacent crimping portions, and a space to be processed is formed between the plurality of crimping portions and the base portion, a second step is formed on the outer end surface of each crimping portion along the height direction, and a second step surface is formed on each second step facing the side where the base portion is located, and a second assembly structure is provided on the base portion;

[0007] A first center hole is extended from the middle of the thin-walled cabin body along the height direction, and one end of the thin-walled cabin body has a section to be processed, the section to be processed has a locally arranged end face to be processed, and an electric machining groove is preset on the side of the end face to be processed close to the first center hole, wherein the electric machining groove extends toward the inside of the section to be processed along the height direction, and the electric machining groove is connected to the first center hole;

[0008] When the positioning block is partially located in the first center hole, the other end of the thin-walled cabin body abuts against the first step surface, the base portion is located in the first center hole, one end of the thin-walled cabin body abuts against multiple second step surfaces, and the end face to be processed is located in the space to be processed, and the first assembly structure and the second assembly structure are fixedly connected.

[0009] In some embodiments, the positioning block includes a first positioning portion and a second positioning portion connected to each other, and the end surface of the first positioning portion facing the side where the second positioning portion is located forms the first step surface;

[0010] A second center hole extending along the height direction is provided in the middle of the first positioning portion, a third center hole extending along the height direction is provided in the middle of the second positioning portion, the second center hole is connected to the third center hole, and the first assembly structure is provided in the middle of the second positioning portion on the side where the fork-shaped pressing block is located;

[0011] Among them, when the first assembly structure and the second assembly structure are fixedly connected, the second positioning portion is located in the first center hole, and there is a first gap L between the outer peripheral surface of the second positioning portion and the side wall of the first center hole, and the value range of the first gap L is: 0.004㎜≤L≤0.006㎜.

[0012] In some embodiments, the crimping portion includes a first crimping portion integrally connected to the base portion, and a second crimping portion connected to the other end of the first crimping portion, the other end of the second crimping portion extending away from the side where the first crimping portion is located in the radial direction, and the second crimping portion is formed with the second step surface toward the side where the base portion is located in the height direction;

[0013] There is a second gap between the outer peripheral surface of the base portion and the side wall of the first center hole, and the distance of the second gap is greater than the distance of the first gap.

[0014] In some embodiments, the positioning tool also includes an auxiliary measuring block, which is detachably fixed on the section to be processed, and is located in the space to be processed, and the auxiliary measuring block is abutted against the side wall of the first center hole. The auxiliary measuring block has an auxiliary processing end face, and the auxiliary processing end face is arranged opposite to the end face to be processed. The auxiliary processing end face is preset with an auxiliary processing groove on the side where the end face to be processed is located, and the auxiliary processing groove is symmetrically arranged with the electric processing groove.

[0015] In some embodiments, a guide portion is disposed on the first positioning portion, and in the height direction, the guide portion is aligned with the end surface to be processed.

[0016] In some embodiments, the other end of the thin-walled cabin has a fixed processing section, the fixed processing section is provided with a plurality of guide holes, the second positioning portion is provided with a plurality of directional holes, and each of the directional holes is arranged in a one-to-one alignment with the guide hole;

[0017] The positioning tool also includes a plurality of positioning pins, each of which is inserted into one of the guide holes and one of the directional holes.

[0018] In some embodiments, a positioning line is defined, the positioning line passes through the center line of the first center hole, and the center lines of at least two of the directional holes coincide with the positioning line;

[0019] The guide portion has a guide surface, and a positioning angle a is formed between the positioning line and the guide surface, and the positioning angle a is less than 90 degrees.

[0020] In some embodiments, the positioning tool further includes a first connecting member;

[0021] The first assembly structure is a first assembly hole, and the first assembly hole is connected to the third center hole;

[0022] The second assembly structure is a second assembly hole, and the first connecting member is inserted into the first assembly hole and the second assembly hole.

[0023] In some embodiments, the plurality of crimping portions are evenly distributed around an outer edge of the base portion.

[0024] On the other hand, the present invention further discloses a method for machining an electro-machined groove of a thin-walled cabin body, wherein the method uses the positioning tool of the thin-walled cabin body to position the thin-walled cabin body on an electric spark machine tool; the method comprises:

[0025] Placing the thin-walled cabin body in the positioning fixture so that the end surface to be processed is located in the space to be processed;

[0026] The positioning block is detachably fixedly connected to the electric spark machine tool along the height direction, and the end face to be processed is arranged toward the automatic feed adjustment device;

[0027] The electrodes of the automatic feed adjustment device are used to process the electro-machined grooves on the thin-walled cabin.

[0028] In order to solve the problem that the existing thin-walled cabin body is subjected to uneven force during the electro-machining groove process, which causes warping during clamping and leads to poor detection accuracy after the thin-walled cabin body is removed after machining, the present invention has the following advantages:

[0029] The technical solution of the present invention can realize relatively tight positioning of the thin-walled cabin body, and make the various preload forces applied to the thin-walled cabin body by the fork-shaped pressure block during positioning the same, and there is no need to design a relatively complex structure for positioning the thin-walled cabin body. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram showing the structure of a thin-walled cabin body being clamped on a positioning fixture is shown;

[0031] Figure 2 Shows Figure 1 A cross-sectional view of the planing line shown in FIG. 1 passing through the electro-machined groove and the auxiliary machined groove along the axis of the thin-walled cabin body;

[0032] Figure 3 Shows Figure 1 The structural diagram of the positioning block shown in;

[0033] Figure 4 Shows Figure 1 A schematic diagram of the structure of the fork-shaped pressing block shown in;

[0034] Figure 5 Shows Figure 4 A schematic structural diagram of the fork-shaped pressing block at another angle is shown in FIG.

[0035] Figure markings: 01-thin-wall cabin; 11-electric machining groove; 02-positioning tool; 21-positioning block; 211-first positioning portion; 2111-second center hole; 2112-guide portion; 212-second positioning portion; 2121-third center hole; 2122-directional hole; 213-first step surface; 2123-first assembly structure; 22-fork-shaped pressure block; 221-base portion; 2211-second assembly structure; 222-crimping portion; 2221-first pressing portion; 2222-second pressing portion; 2223-second step surface; 23-auxiliary measuring block; 231-auxiliary machining groove; 24-positioning pin; 252-guide surface; 26-electrode; 27-first connecting piece. DETAILED DESCRIPTION

[0036] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0037] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0038] This embodiment discloses a positioning tool 02 for a thin-walled cabin 01, such as Figures 1 to 4 As shown, the positioning tool 02 includes a positioning block 21 and a fork-shaped pressing block 22, wherein, along the height direction, the outer end surface of the positioning block 21 is formed with a first step, the first step has a first step surface 213 on the side facing the fork-shaped pressing block 22, and the positioning block 21 is provided with a first assembly structure 2123 on the side facing the fork-shaped pressing block 22;

[0039] The fork-shaped pressing block 22 includes a base portion 221 and a plurality of crimping portions 222 extending along one side of the base portion 221. The plurality of crimping portions 222 are symmetrically arranged along the circumference of the base portion 221. There is a gap between two adjacent crimping portions 222. A space to be processed is formed between the plurality of crimping portions 222 and the base portion 221. A second step is formed on the outer end surface of each crimping portion 222 along the height direction. Each second step is formed with a second step surface 2223 on the side facing the base portion 221. A second assembly structure 2211 is provided on the base portion 221.

[0040] A first center hole is extended from the middle of the thin-walled cabin body 01 along the height direction, and one end of the thin-walled cabin body 01 has a section to be processed, and the section to be processed has a locally arranged end face to be processed, and an electric machining groove 11 is preset on the side of the end face to be processed close to the first center hole, wherein the electric machining groove 11 extends toward the inside of the section to be processed along the height direction, and the electric machining groove 11 is connected to the first center hole;

[0041] When the positioning block 21 is partially located in the first center hole, the other end of the thin-walled cabin body 01 abuts against the first step surface 213, the base portion 221 is located in the first center hole, one end of the thin-walled cabin body 01 abuts against multiple second step surfaces 2223, and the end face to be processed is located in the space to be processed, and the first assembly structure 2123 and the second assembly structure 2211 are fixedly connected.

[0042] In this embodiment, a positioning fixture 02 for positioning a thin-walled cabin body 01 on an electric discharge machine is provided, by fixing the first assembly structure 2123 and the second assembly structure 2211, so that the two opposite ends of the thin-walled cabin body 01 are respectively abutted against the first step surface 213 and the plurality of second step surfaces 2223, and the end surface to be processed is located in the space to be processed. In this application, the end of the thin-walled cabin body 01 located on the side where the section to be processed is located abuts against the second step surface 2223 of the plurality of crimping parts 222 of the fork-shaped pressing block 22, so that the end surface to be processed partially set on the section to be processed is located in the space to be processed, wherein the end surface to be processed is located in the gap between two adjacent crimping parts 222, so as to facilitate the subsequent electrical machining of the preset electrical machining groove 11 on the end surface to be processed on the electric discharge machine.

[0043] Furthermore, the other end of the thin-walled nacelle 01 abuts against the first step surface 213, so as to fix and position the thin-walled nacelle 01 on the first step surface 213 of the positioning block 21. Since part of the positioning block 21 penetrates into the first center hole of the thin-walled nacelle 01, the stability of the thin-walled nacelle 01 being fixed on the positioning block 21 can be further improved; furthermore, since the plurality of crimping portions 222 are symmetrically arranged along the circumference of the base portion 221, when machining the preset electro-machined groove 11, the plurality of pre-tightening forces transmitted to the thin-walled nacelle 01 by the fork-shaped pressing block 22 through the plurality of crimping portions 222 are all the same, so that the thin-walled nacelle 01 can be positioned relatively tightly, and there is no need to design a relatively complex structure for positioning the thin-walled nacelle 01.

[0044] In this embodiment, the first assembly structure 2123 and the second assembly structure 2123 can move relative to each other in the height direction. The first assembly structure 2123 can be a plurality of buckle parts, which extend around the periphery of the positioning block 21 toward the side where the fork-shaped pressure block 22 is located; the second assembly structure 2211 can be a plurality of hook parts, which extend around the periphery of the base part 221 toward the side where the positioning block 21 is located, and the hook parts and the buckle parts are arranged in a one-to-one correspondence. In the present application, the connection between the first assembly structure 2123 and the second assembly structure 2211 can be a threaded connection, a fixed connection (such as a pin connection), a locking connection, or other feasible connection methods, and the present application is not limited thereto.

[0045] Specifically, through the above arrangement, a connection structure is added between the positioning block 21 and the base part 221, so that the connection between the positioning block 21 and the fork-shaped pressing block 22 is more secure. Among them, the buckle section of the buckle part can be a trapezoidal spur gear structure, and the buckle section of the hook part can be a single trapezoidal shape, so that when the positioning block 21 and the fork-shaped pressing block 22 are engaged, the buckle section of the hook part can be moved along the height direction on the buckle section of the buckle part by pushing the fork-shaped pressing block 22, so that the buckle section of the hook part can be engaged with any position on the buckle section of the buckle part, so that the positioning tool 02 can be adjusted to adapt to thin-walled cabins 01 of different lengths, so as to improve the wide applicability of the positioning tool 02.

[0046] In some embodiments, the positioning block 21 includes a first positioning portion 211 and a second positioning portion 212 connected to each other, and the end surface of the first positioning portion 211 facing the side where the second positioning portion 212 is located forms the first step surface 213;

[0047] A second center hole 2111 extending along the height direction is provided in the middle of the first positioning portion 211, a third center hole 2121 extending along the height direction is provided in the middle of the second positioning portion 212, the second center hole 2111 is connected to the third center hole 2121, and the first assembly structure 2123 is provided in the middle of the second positioning portion 212 on the side where the fork-shaped pressing block 22 is located;

[0048] Among them, when the first assembly structure 2123 and the second assembly structure 2211 are fixedly connected, the second positioning portion 212 is located in the first center hole, and there is a first gap L between the outer peripheral surface of the second positioning portion 212 and the side wall of the first center hole, and the value range of the first gap L is: 0.004㎜≤L≤0.008㎜.

[0049] Further, the crimping portion 222 includes a first pressing portion 2221 integrally connected to the base portion 221, and a second pressing portion 2222 connected to the other end of the first pressing portion 2221, the other end of the second pressing portion 2222 extending away from the side where the first pressing portion 2221 is located in the radial direction, and the second step surface 2223 is formed on the second pressing portion 2222 toward the side where the base portion 221 is located in the height direction;

[0050] There is a second gap between the outer peripheral surface of the base portion 221 and the side wall of the first center hole, and the distance of the second gap is greater than the distance of the first gap.

[0051] Furthermore, the positioning tool 02 also includes a first connecting member 27;

[0052] The first assembly structure 2123 is a first assembly hole, and the first assembly hole is connected to the third center hole 2121;

[0053] The second assembly structure 2211 is a second assembly hole, and the first connecting member 27 is inserted into the first assembly hole and the second assembly hole.

[0054] Furthermore, the plurality of crimping portions 222 are evenly distributed around the outer edge of the base portion 221 .

[0055] In this embodiment, through the above arrangement, there is a certain gap between the positioning block 21 located in the first center hole and the inner wall of the thin-walled cabin body 01, which is the first gap. When the value range of the first gap L is 0.004㎜≤L≤0.006㎜, by adjusting the connection relationship between the fork-shaped pressure block 22 and the positioning block 21, the thin-walled cabin body 01 can be aligned on the first step surface 213 when the first positioning portion 211 is located, so that the alignment end face runout is within 0.012㎜, ensuring stable and reliable clamping. At the same time, the above clamping method also avoids the deformation of the thin-walled cabin body 01 caused by pressing the thin-walled outer circle, and further ensures the dimensional accuracy requirements of the electro-machined groove 11. In this application, the value of the first gap L is preferably 0.005㎜.

[0056] Furthermore, the first connecting member 27 may be a bolt, a pin or other implementable structure, and the present application preferably uses a bolt, that is, the first assembly structure 2123 and the second assembly structure 2211 are threadedly connected by bolts.

[0057] Furthermore, through the above-mentioned arrangement, when the thin-walled cabin body 01 is fixed to the positioning block 21 and the fork-shaped pressure block 22 by means of the first assembly structure 2123 and the second assembly structure 2211, the forces applied by the fork-shaped pressure block 22 to the thin-walled cabin body 01 on the side where each crimping portion 222 is located through the first connecting member 27 tend to be the same, so that the multiple forces applied to the thin-walled cabin body 01 can be evenly acted on the first step surface 213 of the positioning block 21 by the thin-walled cabin body 01 (i.e., the force) to be more balanced, so as to further realize and reduce the influence on the precise positioning of the thin-walled cabin body 01.

[0058] Furthermore, by providing a second center hole 2111 in the middle of the first positioning portion 211, a third center hole 2121 is provided in the middle of each of the second positioning portions 212, and the first assembly structure 2123 is a first assembly hole, the first assembly hole is connected to the third center hole 2121, so that the first connecting member 27 can quickly pass through the second center hole 2111 and the third center hole 2121 to achieve a threaded connection with the first assembly hole. At the same time, the other end of the first connecting member 27 passes through the second assembly hole and is threadedly connected thereto, so as to achieve a fixed connection between the positioning block 21 and the fork-shaped pressure block 22.

[0059] In some embodiments, the positioning tool 02 also includes an auxiliary measuring block 23, which is detachably fixed on the section to be processed, and is located in the space to be processed, and the auxiliary measuring block 23 is abutted against the side wall of the first center hole, and the auxiliary measuring block 23 has an auxiliary processing end face, which is arranged opposite to the end face to be processed, and an auxiliary processing groove 231 is preset on the side of the auxiliary processing end face close to the end face to be processed, and the auxiliary processing groove 231 is symmetrically arranged with the electro-processing groove 11.

[0060] Furthermore, a guide portion 2112 is provided on the first positioning portion 211 , and along the height direction, the guide portion 2112 is arranged in alignment with the end surface to be processed.

[0061] Furthermore, the other end of the thin-walled cabin 01 has a fixed processing section, and the fixed processing section is provided with a plurality of guide holes. The second positioning portion 212 is provided with a plurality of directional holes 2122, and each directional hole 2122 is arranged in one-to-one alignment with the guide hole;

[0062] The positioning tool 02 also includes a plurality of positioning pins 24 , each of which is inserted into one of the guide holes and one of the directional holes 2122 .

[0063] Furthermore, a positioning line is defined, the positioning line passes through the center line of the first center hole, and the center lines of at least two of the directional holes 2122 coincide with the positioning line;

[0064] The guide portion 2112 has a guide surface 252 , and a positioning angle a is defined between the positioning line and the guide surface 252 . The positioning angle a is less than 90 degrees.

[0065] In this embodiment, since the electric machining groove 11 is only 1mm deep in the radial direction, it is impossible to detect whether the symmetry meets the requirements, so an auxiliary measurement block 23 is added, and the auxiliary measurement block 23 is fixedly connected to the electric machining groove 11 of the thin-walled cabin body 01 in the 180° direction by screws. Among them, when the electric machining groove 11 of the thin-walled cabin body 01 is punched, the auxiliary machining groove 231 of the same size is punched on the auxiliary measurement block 23 at the same time, so that the groove wall of the electric machining groove 11 of the thin-walled cabin body 01 and the groove wall of the auxiliary machining groove 231 on the auxiliary measurement block 23 are in the same straight line; along the height direction, when used for measuring and detecting the symmetry, the two sides of the electric machining groove 11 and the two sides of the auxiliary machining groove 231 on the auxiliary measurement block 23 are respectively straightened to form two straight lines, so as to facilitate the detection of symmetry. In this application, since the multiple crimping parts 222 are symmetrically arranged along the circumference of the base part 221, it can be achieved that the auxiliary machining groove 231 and the electric machining groove 11 are symmetrically arranged.

[0066] Furthermore, the second positioning portion 212 is provided with a plurality of directional holes 2122 around the plurality of guide holes on the thin-walled cabin 01, and each directional hole 2122 is provided in a one-to-one correspondence with the guide hole. Through the above arrangement, the positioning pin 24 can be inserted into a guide hole and a directional hole 2122 to achieve both orientation and force balance of the thin-walled cabin 01.

[0067] Furthermore, a guide portion 2112 is provided on the first positioning portion 211, and the guide portion 2112 is arranged in alignment with the end face to be processed, so as to play a guiding role when the thin-walled cabin body 01 is installed on the positioning block 21, so that the thin-walled cabin body 01 can be quickly installed on the positioning block 21, thereby improving the assembly efficiency. In the present application, the guide portion 2112 can be formed on the outer surface of one end of the first positioning portion 211 away from the second center hole 2111 in the height direction, and the guide portion 2112 has a guide surface 252, and a positioning angle a is formed between the guide surface 252 and the positioning line, so as to realize the direction alignment of the thin-walled cabin body 01. In the present application, since the spindle of the EDM machine tool cannot rotate at an angle, the guide portion 2112 used for alignment must be in the same position as the electro-machined groove 11.

[0068] The present application also provides a turning method for a workpiece, wherein the method uses the positioning tool 02 of the thin-walled cabin body 01 to position the thin-walled cabin body 01 on an electric spark machine tool; the method comprises:

[0069] Placing the thin-walled cabin 01 in the positioning fixture 02, and making the end surface to be processed located in the space to be processed;

[0070] The positioning block 21 is detachably fixedly connected to the EDM machine tool along the height direction, and the end surface to be processed is arranged toward the automatic feed adjustment device;

[0071] The electrode 26 of the automatic feed adjustment device is used to process the electro-machined groove 11 on the thin-walled cabin body 01 .

[0072] In this embodiment, the thin-walled cabin body 01 can be positioned and clamped on the positioning fixture 02 by the above-mentioned processing method, and then the thin-walled cabin body 01 can be processed by the electric spark machine tool through the electric processing groove 11.

[0073] In this embodiment, the positioning block 21 is The outer circle is matched with the φ84H7 hole of the thin-walled cabin 01. The B reference surface of the positioning block 21 is used as the clamping positioning surface, that is, the plane where the center lines of each directional hole 2122 coincide is the B reference surface. The two φ4.5H7 holes are directional holes 2122. The two positioning pins 24 are respectively inserted into the two directional holes 2122 to both orient and ensure the force balance of the thin-walled cabin 01. The guide part 2112 is machined on the first positioning part 211 of the positioning block 21. The angle between the guide surface of the guide part 2112 and the positioning line where the center lines of the two directional holes 2122 coincide is 42°, which is the electrical machining groove 11 of the thin-walled cabin 01. The guide portion 2112 is provided with an angle with the center line of the directional hole 2122 on a plane perpendicular to the height direction. The guide portion 2112 is provided to realize direction alignment. Since the spindle of the EDM machine tool cannot rotate at an angle, the guide portion 2112 used for alignment must be in the same position as the electro-machined groove 11.

[0074] Furthermore, since the fork-shaped pressing block 22 not only needs to press the end face, but also needs to leave space for the micrometer head to align the outer circle reference of the thin-walled cabin 01 and the slotting space of the auxiliary measuring block 23 in the 180° direction, the fork-shaped pressing block 22 is designed as a hollow four-equally divided fork structure (see Figure 4 ), the second assembly hole is used to connect the screw or nut, and the positioning block 21 and the fork-shaped pressing block 22 can be connected through the second assembly hole.

[0075] Furthermore, the outer arc of the auxiliary measuring block 23 fits the hole wall of the thin-walled cabin 01φ84H7, and the positions of the two threaded holes on the arc correspond to the electro-machined groove 11 of the thin-walled cabin 01. The auxiliary measuring block 23 is connected to the thin-walled cabin 01 using two screws.

[0076] Principle description: The process regulations tighten the coaxiality of the φ84H7 inner hole of the thin-walled cabin body 01 and its quasi-A outer circle φ90 to φ0.01, adopt the reference conversion method, use the positioning block 21 and the thin-walled cabin body 01 φ84H7 hole matching clearance to control within 0.012 for clamping, orient with two φ4.5H7 guide holes in the 180° direction on the thin-walled cabin body 01, locate with the end face of the thin-walled cabin body 01, determine the direction with two positioning pins 24, and find the direction of the electro-machined groove 11 through the guide part 2112 of the positioning block 21. The fork-shaped pressing block 22 presses the end face of the thin-walled cabin body 01 through the first connecting piece 27, and is connected to the positioning block 21 at the same time, so that the two end faces of the thin-walled cabin body 01 are clamped and fixedly pressed, and two 180° directional holes 2122 are used as orientation, thereby avoiding the thin-walled cabin body 01 from tipping over due to uneven force on the thin-walled cabin body 01 during processing, thereby causing the size and symmetry of the electro-machined groove 11 to be out of tolerance.

[0077] Action relationship description: Press the B reference surface of the positioning block 21 through the pressure plate, press the positioning block 21 on the worktable of the EDM machine, and align the runout of the positioning block 21 to no more than 0.006. The purpose is to place the guide part 2112 of the positioning block 21 on the coordinate axis of the EDM machine, and then insert the φ84H7 hole (i.e., the first center hole) of the thin-walled cabin 01 into the positioning block 21, align the guide hole of the thin-walled cabin 01 with the directional hole 2122 of the positioning block 21, and insert the positioning pin 24. Then, use two screws to install the auxiliary measuring block 23 on the opposite side of the electro-machined groove 11 to be machined, and finally tighten the positioning block 21 and the fork-shaped pressing block 22 with the first connecting piece 27, thereby pressing the end face of the thin-walled cabin 01. Using the automatic alignment function of the EDM machine, the micrometer touches the four high points of the outer circle of the thin-walled cabin body 01 reference Aφ90 (the space left by the fork-shaped pressure block 22, that is, the part of the end face of the thin-walled cabin body 01 located in the space to be processed), and the outer circle runout is aligned to be no more than φ0.012. After the reference is aligned, the electrode 26 is installed on the spindle of the EDM machine, that is, on the automatic feed adjustment device, and the electrode 26 is straightened and aligned. The electrode 26 is layered and translated from top to bottom to process the electric machining groove 11 of the thin-walled cabin body 01 Simultaneously process the auxiliary processing groove 231 of the same size on the auxiliary measuring block 23 in the 180° direction After processing, the thin-walled cabin 01 with the auxiliary measuring block 23 is removed from the positioning block 21 for symmetry measurement, and the auxiliary measuring block 23 is removed after the measurement. In the present application, the automatic feed adjustment device drives the electrode 26 to move in the space to be processed, so as to realize simultaneous processing of the electro-machined groove 11 of the section to be processed and the auxiliary machining groove 231 of the auxiliary measuring block 23, so as to realize accurate measurement of the symmetry of the electro-machined groove 11 of the thin-walled cabin 01 and improve the processing efficiency.

[0078] In summary, the above-mentioned structural arrangement can achieve relatively tight positioning of the thin-walled cabin body, and ensure that the various preload forces applied by the fork-shaped pressure block to the thin-walled cabin body during the positioning process are the same, and there is no need to design a relatively complex structure for positioning the thin-walled cabin body.

[0079] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0080] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A positioning tool for a thin-walled cabin, characterized in that: The positioning fixture comprises a positioning block and a fork-shaped pressing block, wherein, along the height direction, the outer end surface of the positioning block is formed with a first step, the first step has a first step surface facing the side where the fork-shaped pressing block is located, and the positioning block is provided with a first assembly structure on the side where the fork-shaped pressing block is located; The fork-shaped pressing block comprises a base portion, and a plurality of crimping portions extending along one side of the base portion, the plurality of crimping portions are symmetrically arranged along the circumference of the base portion, a gap is provided between two adjacent crimping portions, and a space to be processed is formed between the plurality of crimping portions and the base portion, a second step is formed on the outer end surface of each crimping portion along the height direction, and each second step is formed with a second step surface facing the side where the base portion is located, and a second assembly structure is provided on the base portion; A first center hole is extended from the middle of the thin-walled cabin body along the height direction, and one end of the thin-walled cabin body has a section to be processed, the section to be processed has a locally arranged end face to be processed, and an electric machining groove is preset on the side of the end face to be processed close to the first center hole, wherein the electric machining groove extends toward the inside of the section to be processed along the height direction, and the electric machining groove is connected to the first center hole; When the positioning block is partially located in the first center hole, the other end of the thin-walled cabin body abuts against the first step surface, the base portion is located in the first center hole, one end of the thin-walled cabin body abuts against multiple second step surfaces, and the end face to be processed is located in the space to be processed, and the first assembly structure and the second assembly structure are fixedly connected.

2. The positioning tool for the thin-walled cabin according to claim 1, characterized in that: The positioning block comprises a first positioning portion and a second positioning portion connected to each other, and the end surface of the first positioning portion facing the side where the second positioning portion is located forms the first step surface; A second center hole extending along the height direction is provided in the middle of the first positioning portion, a third center hole extending along the height direction is provided in the middle of the second positioning portion, the second center hole is connected to the third center hole, and the first assembly structure is provided in the middle of the second positioning portion on the side where the fork-shaped pressing block is located; Among them, when the first assembly structure and the second assembly structure are fixedly connected, the second positioning portion is located in the first center hole, and there is a first gap L between the outer peripheral surface of the second positioning portion and the side wall of the first center hole, and the value range of the first gap L is: 0.004㎜≤L≤0.006㎜.

3. The positioning tool for the thin-walled cabin as claimed in claim 2, characterized in that: The crimping portion includes a first crimping portion integrally connected to the base portion, and a second crimping portion connected to the other end of the first crimping portion, the other end of the second crimping portion extending away from the side where the first crimping portion is located in the radial direction, and the second crimping portion is formed with the second step surface toward the side where the base portion is located in the height direction; There is a second gap between the outer peripheral surface of the base portion and the side wall of the first center hole, and the distance of the second gap is greater than the distance of the first gap.

4. The positioning tool for a thin-walled cabin as claimed in claim 1, characterized in that: The positioning tool also includes an auxiliary measuring block, which is detachably fixed on the section to be processed, the auxiliary measuring block is located in the space to be processed, and the auxiliary measuring block abuts against the side wall of the first center hole, and the auxiliary measuring block has an auxiliary processing end face, the auxiliary processing end face is arranged opposite to the end face to be processed, and the auxiliary processing end face is preset with an auxiliary processing groove on the side where the end face to be processed is located, and the auxiliary processing groove is symmetrically arranged with the electric processing groove.

5. The positioning tool for the thin-walled cabin as claimed in claim 2, characterized in that: The first positioning portion is provided with a guide portion, and in the height direction, the guide portion is arranged in alignment with the end surface to be processed.

6. The positioning tool for the thin-walled cabin as claimed in claim 5, characterized in that: The other end of the thin-walled cabin body has a fixed processing section, the fixed processing section is provided with a plurality of guide holes, the second positioning portion is provided with a plurality of directional holes, and each of the directional holes is arranged in a one-to-one alignment with the guide hole; The positioning tool also includes a plurality of positioning pins, each of which is inserted into one of the guide holes and one of the directional holes.

7. The positioning tool for the thin-walled cabin as claimed in claim 6, characterized in that: defining a positioning line, the positioning line passing through the center line of the first center hole, and the center lines of at least two of the directional holes coincide with the positioning line; The guide portion has a guide surface, and a positioning angle a is formed between the positioning line and the guide surface, and the positioning angle a is less than 90 degrees.

8. The positioning tool for a thin-walled cabin as claimed in claim 2, characterized in that: The positioning tool also includes a first connecting piece; The first assembly structure is a first assembly hole, and the first assembly hole is connected to the third center hole; The second assembly structure is a second assembly hole, and the first connecting member is inserted into the first assembly hole and the second assembly hole.

9. The positioning tool for a thin-walled cabin as claimed in claim 1, characterized in that: The plurality of crimping portions are evenly distributed around the outer edge of the base portion.

10. A method for machining an electro-machined groove of a thin-walled cabin, characterized in that: The method uses a positioning tool for a thin-walled cabin body as described in any one of claims 1 to 9 to position the thin-walled cabin body on an electric spark machine tool; the method comprises: Placing the thin-walled cabin body in the positioning fixture so that the end surface to be processed is located in the space to be processed; The positioning block is detachably fixedly connected to the electric spark machine tool along the height direction, and the end face to be processed is arranged toward the automatic feed adjustment device; The electrodes of the automatic feed adjustment device are used to process the electro-machined grooves on the thin-walled cabin.

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