Pipe fitting machining method and system

Abstract

The invention discloses a pipe fitting machining method and system, and relates to the technical field of machining. The pipe fitting machining method comprises the steps that a first clamping device is controlled to clamp the middle of a pipe fitting in the axial direction, and in the first clamping device, the clamping face of a clamp is matched with the peripheral face of the pipe fitting in an attached mode; and controlling the end mill to sequentially cut the whole surfaces of the two shaft ends of the pipe fitting, so that the two shaft ends of the pipe fitting respectively form inclined surfaces which are inclined relative to the axial direction. The pipe fitting is clamped by the first clamping device, and the clamping surface of each clamping plate is fitted and matched with the outer surface of the middle part of the pipe fitting, so that surface contact is realized, the positioning is reliable, the pipe fitting is effectively prevented from being deformed due to clamping force, the phenomena of vibration and displacement of the pipe fitting due to cutting force are prevented, and the machining quality of the pipe fitting can be improved; and the end mill is adopted for carrying out whole-face machining on the bevel, the cutting efficiency is high, and materials on the pipe fitting can be rapidly removed.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical processing, and in particular to a pipe processing method and system. Background Art

[0002] The pantograph is a critical component of rail transit vehicles. Its primary function is to draw electricity from the catenary to provide the power and various energy sources required for vehicle operation. The upper frame, welded together from the connecting tube, plays a key role in pantograph assembly. Therefore, the quality of the connecting tube directly impacts the pantograph's reliability, stability, and safety, ultimately impacting the normal operation of high-speed trains, locomotives, and urban rail vehicles.

[0003] The existing pantograph connecting tube is a thin-walled pipe. During its processing, it is clamped with a pressure plate and bolts, and then the end bevel is machined on the connecting tube. However, the pressure plate and the pipe are in point contact, which is subject to cutting forces and easily causes rotational displacement during processing, affecting the processing quality.

[0004] Therefore, how to improve the processing quality of pipe fittings is a technical problem that those skilled in the art currently need to solve. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a pipe processing method and system, which can improve the processing quality of pipes.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A pipe processing method includes: controlling a first clamping device to clamp the middle part of the pipe in the axial direction, wherein the clamping surface of the clamp in the first clamping device fits in contact with the outer peripheral surface of the pipe; controlling an end mill to sequentially cut the entire surface of both axial ends of the pipe so that the two axial ends of the pipe respectively form inclined surfaces inclined relative to the axial direction.

[0008] Preferably, for each pipe, when controlling the first clamping device to clamp the middle portion of the pipe in the axial direction, the remainder of each pipe in the axial direction exceeding the set length remains on the first side of the first clamping device.

[0009] Preferably, the controlled end mill cuts the entire surface of the two axial ends of the pipe fitting in sequence, including: first performing rough processing on the two axial ends of the pipe fitting in sequence, during the rough processing, first performing reverse milling on the axial end of the pipe fitting located on the first side of the first clamping device, and then performing forward milling on the other axial end; then performing fine processing on the two axial ends of the pipe fitting in sequence, during the fine processing, first performing reverse milling on the axial end of the pipe fitting located on the second side of the first clamping device, and then performing forward milling on the other axial end, so as to obtain the two said inclined surfaces.

[0010] Preferably, after machining the two inclined surfaces, the method further comprises: fixing each axial end of the pipe in sequence; when each axial end is fixed, machining a closed keyway and an open keyway in sequence on the other side of the pipe in the axial direction.

[0011] Preferably, the fixing of each axial end of the pipe fitting includes: inserting one end of the pipe fitting into a dividing head, and roughly positioning it with the help of a positioning structure in the dividing head; adjusting the position of the right-angle ruler assembly on the machine tool worktable with the machine tool worktable as a precise reference, so as to precisely position the inclined surface of the pipe fitting extending out of the dividing head through the right-angle ruler assembly; controlling the dividing head to clamp the pipe fitting, and the positioning surface on the clamping claw of the dividing head fits with the pipe fitting.

[0012] Preferably, the processing of the closed keyway includes: firstly making the bottom edge of the keyway milling cutter drill a hole at a preset position on the outer peripheral surface of the pipe to a set depth position, and then performing symmetrical milling along the axial direction in one direction to form the closed keyway; wherein, the bottom edge of the keyway milling cutter is a tip structure and a chip groove is provided.

[0013] Preferably, the processing of the open keyway includes: allowing the keyway milling cutter to enter from the open end position set on the inclined surface, and performing symmetrical milling along the axial direction in one direction to form the open keyway; wherein the groove width of the open keyway is the same as the outer diameter of the keyway milling cutter.

[0014] A pipe processing system includes: a first clamping device, including a vise and a fixture connected to the vise, the fixture including at least two clamping plates, each of which can move relative to each other under the drive of the vise, so as to clamp or loosen the middle part of the pipe in the axial direction through the clamping surfaces of each clamping plate, wherein the clamping surface of the clamp is an adapting surface that fits well with the outer surface of the axial middle part of the pipe; a first milling device, including an end mill, for cutting the entire surface of the two axial ends of the pipe in sequence when the first clamping device clamps the pipe, so that the two axial ends of the pipe respectively form inclined surfaces inclined relative to the axial direction.

[0015] Preferably, a dividing head is further included for clamping one axial end of the pipe when machining the keyway; wherein the positioning surface on the claw of the dividing head for clamping the pipe fits with the pipe.

[0016] Preferably, it further comprises: a keyway milling cutter for machining the keyway, the bottom edge of the keyway milling cutter being a tip structure, and the bottom edge of the keyway milling cutter also being provided with a chip removal groove.

[0017] The pipe fitting processing method provided by the present invention includes: controlling a first clamping device to clamp the middle part of the pipe fitting in the axial direction. Among them, in the first clamping device, the clamping surface of the clamp fits and cooperates with the outer peripheral surface of the pipe fitting; controlling a vertical milling cutter to perform facing cutting on both axial ends of the pipe fitting in sequence, so that inclined surfaces inclined relative to the axial direction are respectively formed at both axial ends of the pipe fitting.

[0018] By clamping the pipe fitting with the first clamping device, and the clamping surfaces of the clamping plates fit and cooperate with the outer surface of the middle part of the pipe fitting, surface contact is achieved, the positioning is reliable, effectively preventing the pipe fitting from deforming due to the clamping force and preventing the pipe fitting from vibrating and shifting due to the cutting force; using a vertical milling cutter for bevel inclined surface facing processing, the cutting efficiency is relatively high, the material on the pipe fitting can be quickly removed, and the processing quality of the pipe fitting can be improved. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0020] Figure 1 is the front view of the pipe fitting;

[0021] Figure 2 is the top view of the pipe fitting;

[0022] Figure 3 is the side view of the pipe fitting;

[0023] Figure 4 is the top view of the feed path when the vertical milling cutter mills the inclined surface in the specific embodiment of the pipe fitting processing method provided by the present invention;

[0024] Figure 5 is the side view when the vertical milling cutter mills the inclined surface and the clamp clamps the pipe fitting in the specific embodiment of the pipe fitting processing method provided by the present invention;

[0025] Figure 6 is the front view schematic diagram when the dividing head positions the pipe fitting in the specific embodiment of the pipe fitting processing method provided by the present invention;

[0026] Figure 7 is the top view schematic diagram when the dividing head positions the pipe fitting in the specific embodiment of the pipe fitting processing method provided by the present invention;

[0027] Figure 8 is the side view when the dividing head positions the pipe fitting in the specific embodiment of the pipe fitting processing method provided by the present invention;

[0028] Figure 9Schematic diagram of a keyway milling cutter in a specific embodiment of the pipe fitting processing method provided by the present invention;

[0029] Figure 10 Flow chart of the pipe fitting processing method provided by the present invention.

[0030] Reference numerals:

[0031] Pipe fitting 1, inclined surface 11, open keyway 12, closed keyway 13;

[0032] Fixture 2, clamping plate 21, clamping surface 211;

[0033] Indexing head 3, chuck 31, positioning surface 311, positioning pin 32;

[0034] Right angle ruler assembly 4, first right angle ruler 41, second right angle ruler 42;

[0035] End mill 5;

[0036] Keyway milling cutter 6, tip 61. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] The core of the present invention is to provide a pipe fitting processing method and system, which can improve the processing quality of pipe fittings.

[0039] In a specific embodiment of the pipe fitting processing method provided by the present invention, which is applied to realize the numerical control milling processing of the connecting pipe of the pantograph upper frame structure member, it mainly includes the processing of the inclined surface 11 at the shaft end and / or the keyway on the circumferential surface of the pipe fitting 1. As Figures 1 to 3 shown, the pipe fitting 1 can specifically be a thin-walled pipe fitting. Optionally, the wall thickness is between 2.5 - 3.5 mm (including 2.5 mm and 3.5 mm). For example, the pipe fitting 1 is a seamless aluminum alloy round pipe with an outer diameter of 60 mm and a wall thickness of 3 mm.

[0040] In specific embodiment one, as Figures 1 to 10 shown, the pipe fitting processing method includes the following steps:

[0041] S1: Control the first clamping device to clamp the middle part of the pipe fitting 1 in the axial direction. Among them, in the first clamping device, the clamping surface 211 of the fixture 2 fits and cooperates with the outer peripheral surface of the pipe fitting 1.

[0042] Among them, the pipe fitting 1 is specifically a round pipe; in other embodiments, it can also be a square pipe or other special-shaped pipes. Additionally, the pipe fitting 1 can be an aluminum alloy pipe.

[0043] Among them, as Figure 4 and Figure 5 shown, in the first clamping device, the clamping surface 211 of the clamp 2 fits and cooperates with the outer peripheral surface of the pipe fitting 1. In some embodiments, the first clamping device includes a clamp 2 and a clamping device; the clamp 2 includes a plurality of clamping plates 21 arranged in sequence along the circumferential direction, and each clamping plate 21 has a clamping surface 211 to fit different positions in the circumferential direction of the outer peripheral surface of the pipe fitting 1, so as to achieve surface contact between the clamp 2 and the pipe fitting 1; each clamp 2 is respectively connected to the clamping device, and the clamping device drives one or more clamps 2 to move, so that each clamp 2 cooperates to clamp the pipe fitting 1 or loosen the pipe fitting 1. For example, the clamping device is a vise, and when clamping, a clamping force of 20 N·m can be applied to the vise with the help of a torque wrench.

[0044] Among them, the surplus of each pipe fitting 1 that is more than the set length in the axial direction remains on the first side of the first clamping device. When milling the inclined surface 11 on the first side, these surpluses are processed off, which is convenient for uniformly positioning and clamping the blank pipe fittings 1 with different lengths during the processing. Optionally, the first side can be the right side of the first clamping device, and the second side can be the left side of the first clamping device. In other embodiments, it can also be the opposite.

[0045] S2: Control the end mill 5 to successively perform face cutting on both axial ends of the pipe fitting 1, so that inclined surfaces 11 are respectively formed on both axial ends of the pipe fitting 1 relative to the axial direction.

[0046] Among them, during processing, start the milling device, and according to the processing requirements of the inclined surface 11, control the end mill 5 to gradually mill the end face edge of the pipe fitting 1 in accordance with the set feed direction and cutting depth to form the inclined surface 11. Additionally, when processing the inclined surface 11, the side cutting edge of the end mill 5 is mainly used for processing the inclined surface 11, and the axial length of the end mill 5 contacts and covers the axial length of the pipe fitting 1 to achieve face cutting.

[0047] Among them, in some embodiments, the outer diameter of the end mill 5 is 30 mm.

[0048] Among them, in some embodiments, the inclined surfaces 11 to be processed at both axial ends of the pipe fitting 1 are symmetrically arranged, and specifically, they can form an included angle of 61° relative to the axial direction, which is used as the welding inclined surface 11 to form a groove with an included angle of 41° with other structural members.

[0049] By clamping the pipe fitting 1 with the first clamping device and making the clamping surfaces 211 of the clamping plates 21 fit with the outer surface of the middle part of the pipe fitting 1, surface contact is achieved, and the positioning is reliable. In addition, the allowances of each pipe fitting 1 in the axial direction are left on the same side of the first clamping device, which is convenient for improving the unity of processing and is beneficial to improving the processing efficiency. In addition, a vertical milling cutter 5 is used for the whole-surface machining of the bevel surface, and the cutting efficiency is relatively high, and the redundant materials on the pipe fitting 1 can be quickly removed.

[0050] Further, in S2, it specifically includes rough machining in S21 and finish machining in S22.

[0051] S21: Rough machining is sequentially performed on the two axial ends of the pipe fitting 1. During rough machining, first, reverse milling is performed on the axial end of the pipe fitting 1 located on the first side of the first clamping device (such as Figure 4 path a in the figure), then, face milling is performed on the other axial end (such as Figure 4 path b in the figure). After that, it enters S22.

[0052] Among them, during rough machining, when using the vertical milling cutter 5 to mill the bevel surface, a 0.5 mm allowance is reserved for finish machining.

[0053] S22: Finish machining is sequentially performed on the two axial ends of the pipe fitting 1. During finish machining, first, reverse milling is performed on the axial end of the pipe fitting 1 located on the second side of the first clamping device (such as Figure 4 path c in the figure), then, face milling is performed on the other axial end (such as Figure 4 path d in the figure) to obtain two bevel surfaces 11.

[0054] Among them, in some embodiments, during the rough machining and finish machining in S2, the coolant is controlled to cool, lubricate, and clean the workpiece to prevent tool sticking, uneven force on the pipe fitting 1, unqualified surface finish, and even tool chipping. During the cooling process, the coolant can be poured, and when machining the bevel surface 11 of the whole surface, the pouring position of the coolant covers the entire cutting surface to ensure that the coolant can fully contact the tool. For example, jet pouring can be used to make the coolant impact the cutting surface with a certain pressure, which can take away heat and some chips at the same time.

[0055] Since when machining the bevel surface 11, rough machining is first performed and then finish machining; during rough machining, the right bevel surface 11 is first reverse milled and then the left bevel surface 11 is face milled, and during finish machining, the bevel surface 11 is machined in the order of left reverse milling and right face milling, the tool wear can be reduced, the processing efficiency can be improved, and moreover, by alternately using reverse milling and face milling, the machining amount of each cutting can be effectively controlled, preventing overcutting and knife nibbling during the machining of the bevel surface 11, and preventing the machining deformation of the thin-walled pipe caused by the change of the cutting force.

[0056] Further, after machining the two inclined surfaces 11, it further includes: the machining step of the keyway. Specifically, the keyway is used for group welding the reinforcing ribs. The keyway includes an open keyway 12 and a closed keyway 13. On both sides in the axial direction, the open keyways 12 on the pipe fitting 1 are symmetrically arranged, and the closed keyways 13 are symmetrically arranged. There are 4 open keyways 12 and 4 closed keyways 13, specifically corresponding to group welding 8 reinforcing ribs. The closed keyways 13 are arranged in the middle in the axial direction, and two open keyways 12 are arranged at each end in the axial direction.

[0057] In some embodiments, the machining step of the keyway includes:

[0058] S3: Fix one axial end of the pipe fitting 1.

[0059] Among them, in some embodiments, a dividing head 3 is used to fix one axial end of the pipe fitting 1. For example, a universal dividing head, and the dividing head 3 with a torque of 18 N / m can be used to clamp the pipe fitting 1.

[0060] Among them, in some embodiments, to machine the keyways at different positions on the pipe fitting 1, the way of turning around can be adopted, so that the two axial ends of the pipe fitting 1 are sequentially fixed to the dividing head 3, and the keyways are machined on the part of the pipe fitting 1 extending out of the dividing head 3.

[0061] Among them, as Figure 6 and Figure 7 shown, in some embodiments, using the dividing head 3 to fix one axial end of the pipe fitting 1 includes:

[0062] S31: Insert one end of the pipe fitting 1 into the dividing head 3 and roughly position it with the positioning structure in the dividing head 3;

[0063] S32: Taking the machine tool workbench as the fine reference, adjust the position of the square component 4 on the machine tool workbench, so as to precisely position the inclined surface 11 of the pipe fitting 1 extending out of the dividing head 3 through the square component 4;

[0064] S33: Control the dividing head 3 to clamp the pipe fitting 1, and the positioning surface 311 on the claw 31 of the dividing head 3 fits and cooperates with the pipe fitting 1.

[0065] By roughly positioning and precisely positioning the pipe fitting 1, the accuracy of the relative center angle position relationship between the keyway and the inclined surface 11 can be ensured.

[0066] Specifically, the positioning structure in the dividing head 3 can be three positioning pins 32 in the dividing head 3, specifically three screw holes. When the pipe fitting 1 is clamped, after the inclined surface 11 of the pipe fitting 1 is machined, the end used for clamping and positioning is put into the dividing head 3 for clamping direction and angle positioning. Three screw holes in the dividing head 3 are mainly used to support the inclined surface 11. The inclined surface angle of the pipe fitting 1 is aligned with the three screw holes at the position of the claw 31 for positioning, serving as the rough positioning reference.

[0067] Specifically, the dividing head 3 clamps and positions the pipe fitting 1. The positioning surface 311 on the jaw 31 of the dividing head 3 fits and contacts the pipe fitting 1 in a surface contact manner. Then, the dividing head 3 clamps one end of the pipe fitting 1 by the method of wrapping and embedding with the outer circle, which can effectively prevent the pipe fitting 1 from deforming due to the clamping force, and can effectively prevent the pipe fitting 1 from vibrating and shifting due to the cutting force.

[0068] Specifically, as Figure 6 and Figure 7 shown, for the end of the pipe fitting 1 that extends out of the dividing head 3 and needs to be processed, a right-angle ruler assembly 4 is used to perform precise positioning with the machine tool workbench as the precise reference. The right-angle ruler assembly 4 specifically includes a first right-angle ruler 41 and a second right-angle ruler 42. The first right-angle ruler 41 is placed flat and attached to the machine tool workbench, and the first side surface of the first right-angle ruler 41 is perpendicular to the set oblique line projected on the machine tool workbench by the inclined surface 11. The second right-angle ruler 42 is placed vertically, and among the two mutually perpendicular side surfaces, one side surface fits the first side surface of the first right-angle ruler 41, and the other side surface is used as the positioning side surface, serving as the angular positioning reference point of the dividing head 3. By making the positioning surface 311 fit the positioning side surface of the pipe fitting 1, the projection of the inclined surface 11 on the machine tool workbench coincides with the set oblique line, and the precise positioning of the inclined surface 11 is completed.

[0069] Among them, for the pipe fitting 1, the first end to be processed is processed clockwise first to eliminate the machining clearance of the dividing head 3 and make the radial angles of the machining positions accurate with each other.

[0070] S4: On the other side in the axial direction of the pipe fitting 1, the closed keyway 13 and the open keyway 12 are processed in sequence, and then enter S3 again until the closed keyway 13 and the open keyway 12 are processed on both sides in the axial direction of the pipe fitting 1.

[0071] Among them, since the machining accuracy requirements of the closed keyway 13 are high, processing the closed keyway 13 first can avoid interference with the closed keyway 13 due to subsequent processing and reduce the possibility of repeated processing. And one end of the open keyway 12 is open, and it is easier to control the size and position accuracy of the keyway during the machining process, thereby ensuring the machining accuracy of the two keyways.

[0072] Among them, in S4, at each end of the pipe fitting 1, it sequentially includes S41: the step of processing the closed keyway 13, and S42: the step of processing the open keyway 12.

[0073] S41: First, make the bottom edge of the keyway milling cutter 6 drill at a preset position on the outer peripheral surface of the pipe fitting 1 to the set depth position, and then perform symmetric milling along the axial direction towards one direction to form the closed keyway 13.

[0074] Among them, as Figure 8As shown, the bottom edge of the keyway milling cutter 6 is a tip structure 61. For example, the tip structure 61 is a drill tip structure with an angle of 118°. At this time, the keyway milling cutter 6 has a tip 61 and can be used as an integrated drilling and milling compound tool. When machining the closed keyway 13, first use the drilling method. The drill tip shape is convenient for centering and can ensure the radial angular position dimension of the keyway.

[0075] Among them, when drilling with the bottom edge of the keyway milling cutter 6, the set position selected is the center position of the closed keyway 13. For example, the closed keyway 13 extends axially, and the set position is the center position of the closed keyway 13 in the axial direction.

[0076] Among them, the set depth position matches the depth of the closed keyway 13 and is not less than the depth of the closed keyway 13.

[0077] Among them, for thin-walled pipe fittings made of aluminum alloy, when drilling, the center of the keyway milling cutter 6 is stressed, and the chip flutes at the center position of the keyway milling cutter 6 are relatively shallow. During the milling process, the aluminum alloy material is relatively soft and easy to stick to the tool. To prevent the keyway milling cutter 6 from squeezing and causing deformation of the pipe fitting 1, the bottom edge of the keyway milling cutter 6 is ground into a drill tip and chip flutes are opened to effectively prevent sticking.

[0078] S42: Make the keyway milling cutter 6 enter from the set open end position on the inclined surface 11 and perform symmetric milling along the axial direction towards one direction to form the open keyway 12.

[0079] Among them, in some embodiments, the groove width of the open keyway 12 is the same as the outer diameter of the keyway milling cutter 6. For example, the keyway groove width is 6.5 mm and the outer diameter of the keyway milling cutter 6 is 6.5 mm. During processing, only one pass is required to machine and form it, which can effectively improve the processing efficiency and speed and control the deformation of the open keyway 12.

[0080] Among them, in some embodiments, the open keyways 12 are symmetrically arranged at both ends of the pipe fitting 1. There are two open keyways 12 provided at each axial end of the pipe fitting 1, and the set open end positions of the two open keyways 12 are spaced 180°. They respectively correspond to the first position and the second position on the inclined surface 11 that are the farthest and the nearest from the center in the axial direction. For example, at the first position, the open keyway 12 has a groove width of 6.5 mm × an axial length of 87 mm, and at the second position, the open keyway 12 has a groove width of 6.5 mm × an axial length of 37 mm.

[0081] Among them, in some embodiments, when machining the open keyway and / or the closed keyway 13, the operating parameters of the milling device can be: the spindle speed rotates 1000 revolutions per minute, the drilling feed rate is 40 millimeters per minute of the feed distance, and the milling feed rate is 80 millimeters per minute of the feed distance.

[0082] Among them, after the closed keyway 13 is formed in S41 or the open keyway 12 is formed in S42, a fillet can also be formed by means of the tip structure 61, that is, the depth of the keyway milling cutter 6 inserted into the corresponding keyway is reduced, so that the tip structure 61 contacts the part of the keyway on the outer peripheral surface of the pipe fitting 1 and processes a fillet, thereby completing the overall processing of the keyway with one tool.

[0083] In this embodiment, when processing the closed keyway 13, the same tool is used. First, the drilling method is adopted for cutting. The tool center of the bottom edge touches the convex circle position of the pipe fitting 1 and processes to the bottom of the keyway, specifically drilling through the pipe wall. The centering is stable, which is beneficial to improving the uniform force of the keyway milling cutter 6 and avoiding the radial angular position deviation of the keyway. Then, the symmetric milling cutting method is adopted, and the closed keyway 13 can be formed in one processing. Through the integrated composite processing method of drilling and milling slots, the machining rigidity of the tool can be satisfied, the auxiliary time for tool change is reduced, the processing efficiency is improved, the product quality is guaranteed, and the relationship between the symmetric processing position of the keyway and the angular direction of the keyway is guaranteed.

[0084] In addition to the above pipe fitting processing method, the present invention also provides a pipe fitting processing system, which can be applied to implement the above pipe fitting processing method, and the beneficial effects can be correspondingly referred to the above embodiments.

[0085] In some embodiments, the pipe fitting processing system includes a first clamping device and a first milling device, which are used to complete the processing and forming of the shaft end inclined surface 11 of the pipe fitting 1. The first clamping device includes a vise and a fixture 2 connected to the vise. The fixture 2 includes at least two clamping plates 21, for example, 2. Each clamping plate 21 can move relatively under the drive of the vise to clamp or release the middle part of the pipe fitting 1 in the axial direction through the clamping surfaces 211 of each clamping plate 21. Among them, the clamping surface 211 of the fixture 2 is an adapting surface that fits with the outer surface of the middle part of the pipe fitting 1 in the axial direction.

[0086] In some embodiments, the clamping plate 21 has a structure with a square outside and a round inside, and the clamping surface 211 is arc-shaped, which is used to achieve surface-to-surface fitting with the arc surface of the outer circumference of the circular pipe fitting 1. The surface opposite to or adjacent to the clamping surface 211 is a plane, and the plane is used to fit with the jaws of the vise so that the jaws can clamp the workpiece.

[0087] In some embodiments, the fixture 2 includes two clamping plates 21, and the two clamping plates 21 are symmetrically arranged. The minimum distance between the clamping surfaces 211 of the two clamping plates 21 in the clamping direction is not less than 1 mm, which prevents the phenomenon that the two clamping plates 21 interfere with each other and cannot clamp the workpiece.

[0088] In some embodiments, the vise is mounted on an existing machine tool. The vise includes a first base and a second base, which form a jaw, specifically a precision jaw, between them. The first base and the second base are respectively used to abut and connect two clamping plates 21. The first base and the second base can move relative to each other in the clamping direction to a distance of less than 60 mm, ensuring that they can clamp a pipe 1 with an outer diameter of 60 mm.

[0089] In some embodiments, the first and second bases are connected and fastened to corresponding clamping plates 21 via at least two bolts. Furthermore, the first base has fixed jaws, while the second base has movable jaws, which connect the two clamping plates 21. In this case, the first base remains stationary while the second base moves closer to or further away from the first base, thereby clamping and releasing the pipe 1.

[0090] The first milling device includes an end mill 5 for sequentially cutting the entire surfaces of both axial ends of the pipe 1 when the first clamping device clamps the pipe 1, so that both axial ends of the pipe 1 form inclined surfaces 11 inclined relative to the axial direction.

[0091] At this time, the outer periphery of the clamp 2 is in contact with the clamping surface 211 of the clamping plate 21, and the pipe fitting 1 is clamped and positioned in an embedded clamping manner. The clamping force on the pipe fitting 1 is uniform, and the force per unit area is uniform, so the surface of the workpiece will not be damaged. It can effectively resist the processing deformation caused by changes in the milling force of the tool, making the processing smoother and improving the clamping rigidity. The clamp 2 is simple to make and is particularly suitable for large-scale production and processing. The two bevels 11 can be clamped and formed at one time, which can effectively ensure the accuracy of the angle and symmetry of the bevel 11, and the efficiency is significantly improved.

[0092] In addition, the clamp 2 uses a vise for direct compression, simplifying the clamping operation and accurately positioning the pipe 1. Furthermore, based on the positioning and clamping principle of the vise holding the pipe 1, the embedded clamping method can be used to clamp a variety of symmetrical thin-walled rotating parts with various shapes, such as irregular cams, thin-walled round rods, and rotary hoists.

[0093] Furthermore, the pipe processing system also includes a dividing head 3, which is used to clamp one axial end of the pipe 1 when processing the keyway. The dividing head 3 includes a three-jaw chuck, and the positioning surface 311 on the jaws 31 of the dividing head 3 for clamping the pipe 1 is fitted with the pipe 1, and the jaws 31 can be soft jaws. For example, the positioning surface 311 of the jaws 31 is an arc surface, which fits with the arc-shaped outer surface of the pipe 1. Through the fitting clamping of the jaws 31 and the pipe 1, the embedded method of clamping thin-walled pipes can be realized. At this time, the three-jaw chuck has the function of automatic positioning and centering, which can improve the repeat positioning accuracy, form a unified workpiece fixture, evenly bear the force, improve the rigidity, and facilitate the adjustment of the clamping force. In addition, by applying this dividing head 3, thin-walled parts with various shapes can be processed, such as rotating thin-walled parts and bowl-shaped thin-walled parts, which can be processed using this embedded clamping method.

[0094] In some embodiments, when the chuck 31 clamps, the relationship between the clamping force of the thin-walled part and the deformation of the workpiece can be effectively and reasonably detected by dial indicator, and the optimal clamping force can be selected to effectively ensure the physical quality of the product processing.

[0095] Furthermore, to realize keyway milling, the pipe fitting processing system further includes a keyway milling cutter 6 for processing the keyway. The bottom edge of the keyway milling cutter 6 is a tip structure 61, and a chip groove is also provided on the bottom edge of the keyway milling cutter 6.

[0096] Among them, when processing the cutting tool, according to the cutting requirements of the thin-walled part, a suitable tip angle is ground to complete the compound processing in one pass. For example, the tip angle of the keyway milling cutter 6 is ground to complete the keyway milling after drilling. In addition, the tip of the two side edges of the keyway milling cutter 6 is ground to complete the chamfering and rounding of the inner and outer cavities.

[0097] By using the keyway milling cutter 6 with the tip structure 61, the keyway can be formed in one pass by one tool, effectively reducing the auxiliary time of tool change and tool installation, reducing the tool cost, improving the utilization rate of the tool, and improving the processing quality and efficiency. In addition, the cutting edge of the keyway milling cutter 6 is ground into the shape of a drill tip. The cutting edge of the keyway milling cutter 6 is closer to the tool shank, the cutting moment of the keyway milling cutter 6 becomes shorter, the rigidity of the tool can be improved, and the circular arc surface drilling and plunge milling are stable in centering, ensuring the processing quality.

[0098] It should be noted that when an element is referred to as "fixed" to another element, it can be directly on the other element or there may also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. In addition, in the description of the present invention, unless otherwise specified, the meanings of "multiple", "multiple roots", and "multiple groups" are two or more.

[0099] The orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0100] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention.

[0101] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. For the same or similar parts among the various embodiments, reference may be made to each other.

[0102] The above has introduced in detail the pipe fitting processing method and system provided by the present invention. Specific examples are used herein to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only for helping to understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A pipe fitting processing method, characterized in that, Comprising: Controlling the first clamping device to clamp the middle part of the pipe fitting (1) axially. In the first clamping device, the clamping surface (211) of the clamp (2) fits and cooperates with the outer peripheral surface of the pipe fitting (1); Controlling the end milling cutter (5) to perform full-face cutting on both axial ends of the pipe fitting (1) in sequence, so that inclined surfaces (11) inclined relative to the axial direction are respectively formed at both axial ends of the pipe fitting (1).

2. The pipe fitting processing method according to claim 1, characterized in that, For each pipe fitting, when controlling the first clamping device to clamp the middle part of the pipe fitting (1) axially: The surplus of each pipe fitting (1) that is more than the set length axially remains on the first side of the first clamping device.

3. The pipe fitting processing method according to claim 1, wherein, The control that the end milling cutter (5) performs full-face cutting on both axial ends of the pipe fitting (1) in sequence includes: First, rough machining is performed on both axial ends of the pipe fitting (1) in sequence. In the rough machining, first, climb milling is performed on the axial end of the pipe fitting (1) located on the first side of the first clamping device, and then down milling is performed on the other axial end; Then, finish machining is performed on both axial ends of the pipe fitting (1) in sequence. In the finish machining, first, climb milling is performed on the axial end of the pipe fitting (1) located on the second side of the first clamping device, and then down milling is performed on the other axial end to obtain the two inclined surfaces (11).

4. The pipe fitting processing method according to any one of claims 1 to 3, characterized in that After machining the two inclined surfaces (11), it further includes: Fixing each axial end of the pipe fitting (1) in sequence; When each axial end is fixed, a closed keyway (13) and an open keyway (12) are machined in sequence on the other side of the pipe fitting (1) axially.

5. The pipe fitting processing method according to claim 4, characterized in that, The fixing of each axial end of the pipe fitting (1) includes: Inserting one end of the pipe fitting (1) into the dividing head (3) and performing rough positioning by means of the positioning structure in the dividing head (3); Taking the machine tool workbench as the precise reference, adjusting the position of the square component (4) on the machine tool workbench to precisely position the inclined surface (11) of the pipe fitting (1) extending out of the dividing head (3) through the square component (4); Controlling the dividing head (3) to clamp the pipe fitting (1), and the positioning surface (311) on the claw (31) of the dividing head (3) fits and cooperates with the pipe fitting (1).

6. The pipe fitting processing method according to claim 4, characterized in that The machining of the closed keyway (13) includes: First, the bottom edge of the keyway milling cutter (6) drills at a preset position on the outer peripheral surface of the pipe fitting (1) to a set depth position, and then symmetric milling is performed along the axial direction towards one direction to form the closed keyway (13); Wherein, the bottom edge of the keyway milling cutter (6) is a tip structure (61) and a chip removal groove is provided.

7. The pipe fitting processing method according to claim 4, characterized in that, The machining of the open keyway (12) includes: Making the keyway milling cutter (6) enter from the set open end position on the inclined surface (11) and performing symmetric milling along the axial direction towards one direction to form the open keyway (12); Wherein, the groove width of the open keyway (12) is the same as the outer diameter of the keyway milling cutter (6).

8. A pipe fitting processing system, characterized in that, Comprising: The first clamping device includes a vise and a fixture (2) connected to the vise. The fixture (2) includes at least two clamping plates (21). Each clamping plate (21) can move relative to each other driven by the vise to clamp or release the middle part of the pipe fitting (1) axially through the clamping surfaces (211) of the clamping plates (21). Among them, the clamping surface (211) of the fixture (2) is a mating surface that fits the outer surface of the middle part of the pipe fitting (1) axially. The first milling device includes an end mill (5), which is used to successively cut the entire surfaces of the two axial ends of the pipe fitting (1) when the first clamping device clamps the pipe fitting (1), so that inclined surfaces (11) inclined relative to the axis are respectively formed at the two axial ends of the pipe fitting (1).

9. The pipe fitting processing system according to claim 8, characterized in that, It further includes a dividing head (3), which is used to clamp one axial end of the pipe fitting (1) when machining a keyway. Among them, on the jaws (31) of the dividing head (3), the positioning surface (311) for clamping the pipe fitting (1) fits and mates with the pipe fitting (1).

10. The pipe fitting processing system according to claim 8, wherein, It further includes: A keyway cutter (6) for machining a keyway. The bottom edge of the keyway cutter (6) is a tip structure (61), and a chip removal groove is also provided on the bottom edge of the keyway cutter (6).

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