Milling machine machining system for special-shaped parts with branch pipe nozzles

Abstract

The invention provides a milling machine machining system for a special-shaped part with a branch pipe nozzle, and belongs to the technical field of forging. In order to solve the problems that a milling machine for the special-shaped part with the branch pipe nozzle is low in machining precision and efficiency, the milling machine machining system for the special-shaped part with the branch pipe nozzle comprises a machine tool driving module; the arm assembly is connected with the machine tool driving module and comprises a first arm and a second arm in transmission connection with the tail end of the first arm; the edge searching module comprises an edge finder detachably connected with the second arm, a coordinate system establishing unit and a path generating unit; the machining module comprises a radial tool rest detachably connected with the second arm and a tool detachably connected with the radial tool rest. The machining coordinate system for the branch pipe nozzle is established through the edge searching module, one-time machining forming in the axial direction of the branch pipe nozzle can be achieved, the precision and quality of a finished product are improved, and the machining efficiency is improved while the flexibility of a machine tool is considered through the radial tool rest.

Description

Technical Field

[0001] The present application relates to the field of forging technology, and in particular to a milling machine processing system for special-shaped parts with branch nozzles. Background Art

[0002] With the rapid development of the national equipment manufacturing industry, the demand for special-shaped forgings continues to rise, and is gradually developing towards special-shaped and large-scale.

[0003] like Figure 1 The special-shaped part with branch nozzles is a key part in a nuclear power evaporator. It is hemispherical as a whole, has two branch nozzles and two circular inclined platforms on the outer contour, and four square bosses are evenly distributed at 90 degrees around the periphery.

[0004] Normally, when a CNC milling machine is used for processing, the milling process is carried out in layers from the top of the part. The processing area can cover most of the outer contour of the part, and the remaining area is processed from the side. However, this processing method, on the one hand, divides the circular contour of the branch nozzle into at least two areas for processing. The datums of the two processes are different. Due to the difference in the accuracy of the datum transfer during processing, there will be a certain degree of tool connection step between the two processes, which affects the dimensional accuracy and processing quality of the branch nozzle, and further affects the accuracy and quality of the part; on the other hand, it requires high movement flexibility of the machine tool, resulting in low processing efficiency. Summary of the invention

[0005] The purpose of this application is to solve the problem of low processing precision and low efficiency of milling machines for special-shaped parts with branch nozzles in the prior art. Therefore, this application provides a milling machine processing system for special-shaped parts with branch nozzles, which establishes a processing coordinate system for the branch nozzles through an edge-finding module, realizes one-time processing along the axial direction of the branch nozzle, improves the precision and quality of the finished product, and improves the processing efficiency while taking into account the flexibility of the machine tool through a radial tool holder.

[0006] The embodiment of the present application provides a milling machine processing system for a special-shaped part with a branch nozzle, wherein the part is hemispherical, and has two branch nozzles and two circular inclined platforms on the outer contour, and four square bosses are evenly distributed at 90° around the periphery, and the square boss has an upper end face, two mutually parallel side end faces and a front end face, the upper end face is parallel to the bottom plane of the part, and the two side end faces and the front end face are perpendicular to the bottom plane of the part, and the system comprises:

[0007] Machine tool drive module;

[0008] An arm assembly connected to the machine tool drive module, the arm assembly comprising a first arm and a second arm drivingly connected to the end of the first arm, the first arm being movable horizontally and vertically, and the second arm being rotatable and self-rotatable about a direction perpendicular to the axis of the first arm;

[0009] an edge-finding module, comprising an edge-finding device for detachably connecting to the second arm, a coordinate system establishing unit, and a path generating unit;

[0010] A processing module comprises a radial tool holder detachably connected to the second arm and a tool detachably connected to the radial tool holder; wherein,

[0011] The coordinate system establishment unit is used to establish a processing coordinate system through the edge finder and the arm assembly, and the processing coordinate system realizes one-time processing and forming of the branch nozzle along the axial direction of the branch nozzle;

[0012] The path generation unit is used to perform edge finding operation according to the machining coordinate system and through the edge finder in cooperation with the arm assembly, obtain edge finding data, and generate a tool path corresponding to the machining process according to the edge finding data;

[0013] The radial tool holder comprises a base, a sliding mechanism and a mounting rod for mounting a tool, wherein the base is detachably connected to the end of the second arm, and the sliding mechanism is arranged on the base and can drive the mounting rod to move in a direction perpendicular to the axial direction of the second arm;

[0014] The machine tool driving module is used to control the vertical movement of the first arm and the rotation of the second arm according to the tool path, and the sliding mechanism drives the mounting rod to move to the processing position.

[0015] By adopting the above technical scheme, the branch nozzle is finely processed by a milling machine, and the processing coordinate system for the branch nozzle is accurately established by a coordinate system establishment unit, so that the branch nozzle can be processed along the axial direction, ensuring that the branch nozzle is processed and formed in one time, avoiding the generation of a tool connection step on the branch nozzle, and improving the precision and quality of the finished product; and, through the radial tool holder, the circumferential movement of the tool around the axis of the branch nozzle during the processing is converted from the horizontal movement of the first arm to the rotation of the second arm, thereby reducing the movement amplitude of the first arm (that is, the machine tool), that is, the first arm only needs to move vertically and the second arm only rotates, so as to achieve the flexibility of the entire arm assembly (that is, the machine tool) while improving the processing efficiency; at the same time, the processing position can be adjusted by the sliding mechanism to ensure the processing accuracy, and the radial tool holder does not need to replace a variety of different tools, and only uses the same specification of turning tools to realize the processing of the branch nozzle, effectively reducing the cost of machining, and can further improve the processing efficiency without changing the tool, and reduce the difficulty of tool maintenance.

[0016] In some embodiments, the coordinate system establishing unit performs the following steps:

[0017] S10, obtaining a blank, wherein the blank is formed with a bottom plane, an outer cylindrical surface, four square bosses and a branch nozzle blank, and fine-machining the bottom plane and the outer cylindrical surface of the blank by a vertical lathe, and fine-machining the upper end surface, both side end surfaces and the front end surface of the square boss, and the end surface of the branch nozzle blank by a milling machine;

[0018] S20, the second arm is equipped with an edge finder to determine an initial coordinate system in cooperation with the spherical center of the blank and the end surface of the square boss;

[0019] S30, rotating the blank to an angle corresponding to the nozzle blank through a milling machine turntable, and rotating the initial coordinate system until its Z axis coincides with the center line of the nozzle blank to form a second coordinate system;

[0020] S40, place the end face of the edge finder against the end face of the branch nozzle blank to obtain the Z value of the end face of the branch nozzle blank in the second coordinate system; replace the second arm with a processing module, and make the tool end face of the processing module against the end face of the bevel nozzle, reset the Z axis 0 position of the second coordinate system according to the Z value, and obtain the final processing coordinate system.

[0021] In some embodiments, S20, the second arm is equipped with an edge finder, and an initial coordinate system is determined in cooperation with the spherical center of the blank and the end surface of the square boss, including:

[0022] S21, rotating the blank to the B-axis 0 position, installing an edge finder on the second arm, and placing the edge finder against two side end surfaces of the square boss, and taking the center of the two positions of the edge finder as the X-axis 0 position;

[0023] S22, the side of the edge finder is placed against the upper end surface of the square boss, and the angle between the side of the edge finder and the upper end surface is equal to the angle between the branch nozzle of the part and the center axis of the part, and the position where the edge finder moves downward by a distance Z is the Z axis 0, Z = H0 + D / 2 × SIN (α);

[0024] S23, the edge finder keeps its angle unchanged, and its side is pressed against the front end surface of the square boss, and the edge finder is moved toward the center axis of the blank by a distance Y to the Y axis 0 position, Y=L0+D / 2×COS(α);

[0025] S24, establishing the initial coordinate system according to the X-axis 0 position, the Y-axis 0 position, and the Z-axis 0 position;

[0026] Among them, D is the diameter of the edge finder, H0 is the distance between the upper end face of the square boss and the center of the blank, α is the angle between the branch nozzle of the part and the center axis of the part, and L0 is the distance between the front end face of the square boss and the center of the blank.

[0027] In some embodiments, the base extends in a direction perpendicular to the axial direction of the second arm, and is detachably connected to the end of the second arm with the axis of the second arm as the center line;

[0028] The sliding mechanism comprises a driving member and a screw transmission assembly arranged along the extension direction of the base and connected in transmission. The screw transmission assembly is provided with a sliding block, and the mounting rod is provided on the side of the sliding block away from the base.

[0029] By adopting the above technical solution, a base is extended in a direction perpendicular to the axial direction of the second arm, so that the mounting rod arranged on the base is at a certain distance from the second arm, thereby realizing the conversion of the rotation of the second arm into the circumferential movement of the mounting rod and the tool thereon, that is, replacing the horizontal movement of the first arm; and the sliding mechanism adopts a screw drive to realize the movement of the mounting rod, thereby improving the positioning accuracy and stability of the movement of the mounting rod, and having a strong load capacity, which can improve the stability of the tool.

[0030] In some embodiments, the base is connected to the second arm via a connecting handle, and a conductive slip ring is further provided between the connecting handle and the base, and the machine tool drive module is connected to the drive member via the conductive slip ring.

[0031] In some embodiments, the connecting handle is a tapered handle, and a small end of the connecting handle is connected to the second arm, and a large end of the connecting handle is connected to the base.

[0032] In some embodiments, a side cover of the base corresponding to the sliding mechanism is provided with a dust cover, and the dust cover is provided with an avoidance groove corresponding to the sliding path of the sliding mechanism to allow the mounting rod to move.

[0033] In some embodiments, the tool is a turning tool.

[0034] In some embodiments, a monitoring module is further included, wherein the monitoring module is used to monitor the distance b between the blade of the knife and the mounting rod;

[0035] The machine tool driving module determines the processing position according to the distance b and the tool path, and the processing position is the distance a between the mounting rod and the axis of the second arm;

[0036] The monitoring module or the machine tool driving module is further configured to issue a tool change warning signal in response to the spacing b being smaller than a first threshold.

[0037] In some embodiments, a monitoring module is further included, wherein the monitoring module is used to monitor the blade temperature of the tool;

[0038] The machine tool driving module controls the rotation speed of the second arm according to the temperature.

[0039] Other features and corresponding beneficial effects of the present application are described in the latter part of the specification, and it should be understood that at least some of the beneficial effects become obvious from the records in the specification of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of a special-shaped part with a branch nozzle provided in an embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the conventional processing state of the parts in the embodiment of the present application;

[0042] FIG3(a)-(b) are schematic diagrams of an initial coordinate system established in an embodiment of the present application, which coincides with the design reference, and FIG3(a) is an XZ axis view, and FIG3(b) is an XY axis view;

[0043] Figure 4 The edge finder in the embodiment of the present application is attached to the side end surface of the square boss to set the X-axis 0 position in the center;

[0044] Figure 5 The edge finder in the embodiment of the present application is attached to the upper end surface of the square boss to set the Z axis 0 position;

[0045] Figure 6 The edge finder in the embodiment of the present application is attached to the front end surface of the square boss to set the Y-axis 0 position;

[0046] Figure 7 This is a schematic diagram of the conversion of the X and Y axes in the embodiment of the present application;

[0047] 8(a)-(b) are schematic diagrams of a second coordinate system established in an embodiment of the present application, wherein FIG. 8(a) is an XZ axis view, and FIG. 8(b) is an XY axis view;

[0048] Fig. 9 It is a schematic diagram of machining the conical surface of the branch nozzle of a part by a machine tool equipped with a radial tool holder in an embodiment of the present application;

[0049] Fig.10 It is a schematic structural diagram of a radial tool holder in an embodiment of the present application;

[0050] Fig.11 It is a schematic structural diagram of a radial tool holder equipped with a dust cover in an embodiment of the present application.

[0051] Description of reference numerals:

[0052] 1. Special-shaped parts with branch nozzles; 2. Branch nozzles; 3. Square boss; 31. Side end face; 32. Upper end face; 33. Front end face;

[0053] 100, arm assembly; 110, first arm; 120, second arm; 200, edge finder; 300, tool;

[0054] 400, radial tool holder; 410, base; 420, sliding mechanism; 421, driving member; 422, screw rod; 423, bearing seat; 424, slider; 430, mounting rod; 440, connecting handle; 450, conductive slip ring; 460, dust cover. DETAILED DESCRIPTION

[0055] The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this application are limited to the implementation. On the contrary, the purpose of introducing the application in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present application. In order to provide a deep understanding of the present application, the following description will include many specific details. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0056] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0057] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 on the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description created by the present application, unless otherwise specified, "multiple" means two or more. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] See also Figure 1 , Figure 1 This is a schematic structural diagram of a special-shaped part 1 with a branch nozzle provided in an embodiment of the present application.

[0059] The embodiment of the present application is mainly for processing a special-shaped part 1 with a branch nozzle and parts of similar shapes. The part 1 is hemispherical, and has two branch nozzles 2 and two circular inclined platforms on the outer contour. There are four square bosses 3 evenly distributed at 90° around the periphery, and the square bosses 3 have an upper end face 32, two mutually parallel side end faces 31 and a front end face 33. The upper end face 32 is parallel to the bottom plane of the part 1, and the two side end faces 31 and the front end face 33 are perpendicular to the bottom plane of the part 1.

[0060] See also Figure 2 , Figure 2 This is a schematic diagram of the conventional processing state of part 1 in the embodiment of the present application.

[0061] Usually, the finishing of the nozzle 2 of the part 1 needs to be divided into at least two areas for processing, and the bases of the two processings are different ( Figure 2 Schematic diagram of one of the processing states). Due to the difference in the accuracy of the reference transfer during processing, there will be a certain degree of tool connection step between the two processings, which will affect the dimensional accuracy and processing quality of the branch nozzle 2, and further affect the accuracy and quality of the part 1.

[0062] At the same time, when the original machine tool is used for processing, the first arm 110 of the milling machine arm assembly 100 needs to move horizontally and vertically in real time to enable the milling cutter to process the branch nozzle 2. The machine tool has a large movement range and requires high flexibility, resulting in low movement efficiency of the first arm 110, which in turn leads to low processing efficiency.

[0063] Moreover, during the milling process, it is necessary to stop the machine and replace different tools 300 according to different working positions, that is, to replace the milling cutter disc, square shoulder milling cutter, first bull nose milling cutter (forward processing of the blank) and second bull nose milling cutter (inverted processing of the blank) for different positions of the branch nozzle 2, which further reduces the processing efficiency, and the use and maintenance of multiple different tools 300 will also increase costs.

[0064] To this end, an embodiment of the present application provides a milling machine processing system for a special-shaped part 1 with a branch nozzle, including a machine tool drive module, an arm assembly 100, an edge-finding module and a processing module.

[0065] Specifically, the machine tool drive module and the arm assembly 100 can adopt the drive module and rocker arm of the original machine tool, that is, the machine tool drive module usually includes a power supply and a controller, the power supply provides power for the machine tool movement, and the controller controls the machine tool movement, such as the movement of the arm assembly 100.

[0066] Usually, the arm assembly 100 is connected to the machine tool drive module. In addition, the arm assembly 100 includes a first arm 110 and a second arm 120 connected to the end of the first arm 110 by transmission. The first arm 110 can move horizontally and vertically (meaning moving along the X, Y, and Z axes of the machining coordinate system), and the second arm 120 can rotate around the direction perpendicular to the axial direction of the first arm 110 and rotate itself, thereby realizing the full-directional movement of the tool 300.

[0067] The edge finding module includes an edge finder 200 for detachably connecting to the second arm 120, a coordinate system establishment unit and a path generation unit. The edge finder 200 is also called a centering rod or a center rod, which is an important auxiliary tool in machine tool operation and is mainly used for positioning machine tool workpieces.

[0068] The processing module includes a radial tool holder 400 for detachably connecting to the second arm 120 and a tool 300 detachably connecting to the radial tool holder 400. Preferably, a turning tool is used to realize the turning operation, and the tool 300 performs continuous linear cutting on the processed surface during the processing, so that the processed part has high dimensional accuracy and excellent surface quality.

[0069] Among them, the coordinate system establishment unit is used to establish a processing coordinate system through the edge finder 200 and the arm assembly 100, and the processing coordinate system realizes one-time processing and forming of the branch nozzle 2 along the axial direction of the branch nozzle 2, that is, the processing coordinate system is converted into a rotating coordinate system with the same angle as the branch nozzle 2, and the branch nozzle 2 can be processed along the axial direction to ensure that the branch nozzle 2 is processed and formed in one time, avoid the generation of a tool connecting step on the branch nozzle 2, and improve the accuracy and quality of the finished product.

[0070] The path generation unit is used to perform edge-finding operations according to the machining coordinate system and in cooperation with the edge finder 200 and the arm assembly 100, obtain edge-finding data, and generate a tool 300 path corresponding to the machining process according to the edge-finding data. The edge-finding operation is a prior art in machine tool operations. Usually, the edge finder 200 is installed at the end of the second arm 120, and the machine tool drive module controls the arm assembly 100 to move so that the edge finder 200 touches the edge of the workpiece to be machined and generates corresponding edge-finding data. The path generation unit uses the three-dimensional software UG to adjust the digital model according to the edge-finding data, defines the machining allowance corresponding to the machining process, and automatically generates a program using the machining function of the software, that is, the path generation unit generates the tool 300 path corresponding to the machining process according to the edge-finding data. Among them, the three-dimensional software UG generates the tool 300 path corresponding to the machining process according to the edge-finding data, which is a prior art, so it will not be repeated in this article.

[0071] The radial tool holder 400 includes a base 410, a sliding mechanism 420 and a mounting rod 430 for mounting the tool 300. The base 410 is detachably connected to the end of the second arm 120. The sliding mechanism 420 is arranged on the base 410 and can drive the mounting rod 430 to move in a direction perpendicular to the axial direction of the second arm 120.

[0072] The machine tool drive module is used to control the vertical movement of the first arm 110 and the rotation of the second arm 120 according to the path of the tool 300, and the sliding mechanism 420 drives the mounting rod 430 to move to the processing position, that is, after the radial tool holder 400 is in the boring starting position. At this time, it can be understood that the vertical movement of the first arm 110 is the movement along the Z axis of the processing coordinate system, and the axis of the second arm 120 coincides with the Z axis. The circumferential movement of the tool 300 around the axis of the branch nozzle 2 during the processing is converted from the horizontal movement of the first arm 110 to the rotation of the second arm 120, thereby reducing the movement amplitude of the first arm 110 (that is, the machine tool), that is, the first arm 110 only needs to move vertically and the second arm 120 only rotates, so as to achieve the flexibility of the arm assembly 100 as a whole (that is, the machine tool) while improving the processing efficiency.

[0073] At the same time, the processing position can be adjusted by the sliding mechanism 420, that is, it can match the processing surface of the workpiece to be processed, so as to ensure the processing accuracy, and the radial tool holder 400 can convert the milling operation into a turning operation, so there is no need to replace a variety of different tools 300. Only using the same specification of turning tools can realize the processing of the branch nozzle 2, which effectively reduces the cost of machining. The machining efficiency can be further improved without changing the tool, and the maintenance difficulty of the tool 300 can be reduced.

[0074] Please refer to Figures 3-8, Figures 3(a)-(b) are schematic diagrams of the initial coordinate system established in the embodiment of the present application, which coincides with the design reference, and Figure 3(a) is an XZ axis view, and Figure 3(b) is an XY axis view; Figure 4 In the embodiment of the present application, the edge finder 200 is attached to the side end surface of the square boss 3 to set the X-axis 0 position in the middle; Figure 5 In the embodiment of the present application, the edge finder 200 is attached to the upper end surface of the square boss 3 to set the Z axis at 0 position; Figure 6 In the embodiment of the present application, the edge finder 200 is attached to the front end surface of the square boss 3 to set the Y-axis at 0 position; Figure 7 8(a)-(b) are schematic diagrams of the second coordinate system established in the embodiment of the present application, wherein FIG8(a) is an XZ axis view and FIG8(b) is a YZ axis view.

[0075] In one embodiment, the coordinate system establishment unit performs the following steps:

[0076] S10, obtaining a blank, wherein the blank is formed with a bottom plane, an outer cylindrical surface, four square bosses 3 and a branch nozzle blank. The blank can be prepared by conventional techniques in the art, which belongs to a rough machining process.

[0077] After the previous blank is transferred to the finishing process, the vertical lathe is first used to finish the bottom plane and outer cylindrical surface of the blank as a reference for milling machine processing to ensure that the processing content of the vertical lathe is consistent with the processing content of the milling machine. This step can also record the measured size of the large outer circle and the measured size of the bottom plane from the center of the ball (design basis) as a reference for the subsequent milling machine benchmark establishment.

[0078] Then, the upper end face 32, the two side end faces 31 and the front end face 33 of the square boss 3, as well as the end face of the branch nozzle blank are finely processed by a milling machine, which may specifically include:

[0079] S11. The blank after fine processing on the vertical lathe is transferred to the milling machine, and the center axis of the blank is made to coincide with the rotation center axis of the milling machine table. That is, the blank is placed at the center of the turntable of the milling machine, and a circle is circled to confirm that the center axis of the blank coincides with the rotation center axis of the milling machine table.

[0080] S12, rotate the blank to any position facing the square boss 3, and set the B axis to 0 position.

[0081] Preferably, fine adjustment is performed by slight rotation and the front end face 33 of the square boss 3 is checked by a drag gauge to determine the straightness of the blank so as to determine the orientation of the blank facing the square boss 3, and the square boss 3 on at least the left and right sides of the square boss 3 is checked by a drag gauge to verify the 0 position of the B-axis (rotation axis).

[0082] Because the four square bosses 3 are evenly distributed, it can be verified by other square bosses 3, and can be further rotated 90°, 180°, and 270° respectively, and the remaining three square bosses 3 can be verified to be straight by dragging the table.

[0083] S13, milling the upper end surface 32, the two side end surfaces 31 and the front end surface 33 of the square boss 3 to a minimum extent.

[0084] In this step, each end face of the square boss 3 is finely processed as a measurement reference to ensure the accuracy of the subsequent coordinate system establishment.

[0085] Specifically, see Figure 7 , mill the upper end faces 32 of the square boss 3 at four edges around it at the minimum amount, and mill the size reference on both sides, use a meter to check the actual value of the distance between the upper end face 32 of the square boss 3 and the bottom plane, and add up the distance from the bottom plane to the center of the sphere, which is recorded as H0.

[0086] The front end faces 33 of the square boss 3 are milled flat at four minimum points, and the measured value of the distance between the front end faces 33 of the square boss 3 and the center of the sphere is measured based on the measured size of the outer cylindrical surface, which is recorded as L0.

[0087] It is understandable that when processing the upper end faces 32 of the four square bosses 3, the dimensions should be consistent, so as to facilitate the reference for setting the Z-axis 0 point later. When processing the side end faces 31 of the square boss 3, the two sides should be symmetrical, so as to center and determine the X-axis 0 point when the arm assembly 100 is installed.

[0088] S14, adjust the angle of the second arm 120 in the arm assembly 100 to be the same as that of the branch nozzle blank. Preferably, the second arm 120 is fixed by a dial indicator, and the milling head is pressed to detect the straightness and bevel of the front end surface 33 of the square boss 3 to verify the angle of the second arm 120 to ensure that it is the same as the angle of the branch nozzle blank, that is, the reference plane on the second arm 120 or the plane of the tool 300 is pressed by a dial indicator or other detection tool, and then the second arm 120 is moved in the vertical angle direction, and the accuracy of the angle is verified by the change of the dial indicator reading.

[0089] The blank is rotated to the corresponding angle of the branch nozzle blank through the turntable, and the end face of the branch nozzle blank is milled flat by the minimum amount by the processing tool 300 installed on the second arm 120, which is used as a reference for subsequent transfer.

[0090] S20, the second arm 120 is equipped with an edge finder 200, and the initial coordinate system is determined in conjunction with the spherical center of the blank and the end surface of the square boss 3, which may specifically include:

[0091] S21, the blank is rotated to the B axis 0 position, the second arm 120 is equipped with the edge finder 200, and the edge finder 200 is placed against the two side end surfaces 31 of the square boss 3, and the center of the two positions of the edge finder 200 is taken as the X axis 0 position, see Figure 4 .

[0092] S22, the side of the edge finder 200 is pressed against the upper end surface 32 of the square boss 3, and the angle between the side edge finder 200 and the upper end surface 32 is equal to the angle between the branch nozzle 2 of the part 1 and the central axis of the part 1, and the distance Z moved downward by the edge finder 200 is the Z axis 0 position, Z = H0 + D / 2 × SIN (α), see Figure 5 .

[0093] S23, the edge finder 200 keeps the angle unchanged, and its side is pressed against the front end surface 33 of the square boss 3, and the edge finder 200 is moved to the center axis of the blank by a distance Y, which is the Y axis 0 position, Y = L0 + D / 2 × COS (α), see Figure 6 .

[0094] S24, establish an initial coordinate system according to the X-axis 0 position, the Y-axis 0 position and the Z-axis 0 position, see Figure 3 (a)-(b). At this point, the initial processing reference and 0 position setting of the part 1 in the state of the arm assembly 100 are completed.

[0095] Among them, D is the diameter of the edge finder 200, H0 is the distance between the upper end face 32 of the square boss 3 and the center of the blank, α is the angle between the branch nozzle 2 of part 1 and the central axis of part 1, that is, the angle between the center line of the branch nozzle blank and the central axis of the blank, and L0 is the distance between the front end face 33 of the square boss 3 and the center of the blank.

[0096] It should be noted that the X-axis 0 position, Y-axis 0 position and Z-axis 0 position obtained above refer to the planes whose X, Y and Z axis coordinates are 0, and the initial coordinate system is obtained by intersecting the three planes.

[0097] S30, the blank is rotated to the angle corresponding to the nozzle blank through the milling machine turntable. Since the machining reference is set at the center of the blank, and the center axis of the blank coincides with the center axis of the turntable, the reference origin does not shift when the blank is rotated.

[0098] The initial coordinate system is rotated until its Z axis coincides with the center line of the branch nozzle blank to form a second coordinate system. The rotation of the coordinate system can be completed by the machine tool program. The command for the machine tool to rotate the coordinate system is ROT X = -α, see Figure 8 (a)-(b). At this point, the machining datum along the axial direction of the branch nozzle 2 is completed.

[0099] However, this coordinate system is established when the edge finder 200 is clamped. After replacing the processing module, the processing module length is different from the edge finder 200 length, so the 0 position of the processing feed axis (Z axis in this embodiment) needs to be reset. At this time, the end face of the branch nozzle 2 is used as the conversion reference of the front and rear Z axis 0 position, which can complete the reference conversion more conveniently and accurately. At the same time, when the edge finder 200 or the processing tool 300 is replaced, the axis thereof coincides with the axis of the second arm 120, so the 0 points of the remaining two axes do not need to be converted.

[0100] Therefore, it also includes:

[0101] S40, placing the end face of the edge finder 200 against the end face of the branch nozzle blank to obtain the Z value of the end face of the branch nozzle blank in the second coordinate system.

[0102] The second arm 120 is replaced with a processing module, and the end face of the tool 300 in the processing module is placed against the end face of the inclined nozzle. According to the Z value, the Z-axis 0 position of the second coordinate system is reset through the machine tool program to obtain the final processing coordinate system. At this point, the coordinate system and 0 position setting of the processing branch nozzle 2 of the arm assembly 100 with the tool 300 clamped are completed.

[0103] See also Figure 9-11 , Fig. 9 It is a schematic diagram of machining the conical surface of the branch nozzle 2 of the part 1 by a machine tool equipped with a radial tool holder 400 in the embodiment of the present application; Fig.10 Schematic diagram of the structure of the radial tool holder 400 in the embodiment of the present application; Fig.11 It is a schematic structural diagram of a radial tool holder 400 equipped with a dust cover 460 in an embodiment of the present application.

[0104] In one embodiment, the base 410 extends in a direction perpendicular to the axial direction of the second arm 120, so that the mounting rod 430 disposed on the base 410 is at a certain distance from the second arm 120, so as to realize the conversion of the rotation of the second arm 120 into the circumferential movement of the mounting rod 430 and the tool 300 thereon, that is, to replace the horizontal movement of the first arm 110. In addition, the base 410 is detachably connected to the end of the second arm 120 with the axis of the second arm 120 as the center line, which can improve the stability of the base 410 and facilitate the maintenance of the radial tool holder 400.

[0105] The sliding mechanism 420 includes a driving member 421 and a lead screw transmission assembly arranged along the extension direction of the base 410 and connected by transmission, a slider 424 is provided on the lead screw transmission assembly, and a mounting rod 430 is provided on the side of the slider 424 away from the base 410, that is, the sliding mechanism 420 uses a lead screw transmission to realize the movement of the mounting rod 430, which improves the positioning accuracy and stability of the movement of the mounting rod 430, and has a strong load capacity, which can improve the stability of the tool 300. Preferably, the driving member 421 is a servo motor and a matching reduction box.

[0106] In one embodiment, a bearing seat 423 is symmetrically arranged at the bottom of the base 410, and the lead screw 422 of the lead screw transmission assembly is connected to the bearing seat 423, thereby improving the transmission stability.

[0107] It is understandable that in order to achieve stable movement of the slider 424 driven by the lead screw transmission assembly, a limiting mechanism is connected between the slider 424 and the base 410 .

[0108] In one embodiment, the base 410 is connected to the second arm 120 via a connecting handle 440, and a conductive slip ring 450 is provided between the connecting handle 440 and the base 410. The machine tool drive module is connected to the drive member 421 via the conductive slip ring 450, thereby facilitating wiring.

[0109] In one embodiment, the connecting handle 440 is a tapered handle, and the small end of the connecting handle 440 is connected to the second arm 120, and the large end is connected to the base 410, so as to better fit the second arm 120. Preferably, the connecting handle 440 is a BT60 tool handle.

[0110] In one embodiment, a dust cover is provided on one side of the base 410 corresponding to the sliding mechanism 420 to improve the protection of the radial tool holder 400 and extend its service life. Correspondingly, the dust cover is provided with an avoidance groove corresponding to the sliding path of the sliding mechanism 420 for the installation rod 430 to move.

[0111] In one embodiment, the system further includes a monitoring module, which is used to monitor the distance b between the blade of the tool 300 and the mounting rod 430 .

[0112] The machine tool driving module determines the processing position according to the distance b and the path of the tool 300 , and the processing position is the distance a between the mounting rod 430 and the axis of the second arm 120 .

[0113] Assume that after the new tool 300 is installed on the mounting rod 430, the distance between the blade of the tool 300 and the mounting rod 430 is a1, and in the tool 300 processing path corresponding to the tool 300, the theoretical distance between the mounting rod 430 and the axis of the second arm 120 is c1. After the tool 300 processes the surface to be processed for a period of time, the monitoring module measures that the distance between the blade and the mounting rod 430 is d1, and the wear size of the blade is a1-d1, and then the wear size is compensated to the distance of the tool 300 processing path, so that the actual distance between the mounting rod 430 and the axis of the second arm 120 is c1-(a1-d1), that is, the actual distance between the mounting rod 430 and the axis of the second arm 120 is c1-a1+d1.

[0114] In one embodiment, the monitoring module or the machine tool drive module is also used to respond to the spacing b being less than the first threshold, that is, the tool 300 is too worn, and issue a tool change warning signal so as to replace the new tool 300 in time to ensure that the radial tool holder 400 performs accurate and effective processing on the processing surface.

[0115] In one embodiment, the monitoring module is used to monitor the blade temperature of the tool 300. In this case, the monitoring module may include an infrared temperature measuring probe.

[0116] The machine tool driving module controls the rotation speed of the second arm 120 according to the temperature to take into account both processing efficiency and safety.

[0117] In one embodiment, the monitoring module or the machine tool driving module is further configured to issue an overheating warning signal in response to the temperature being greater than a second threshold.

[0118] In one embodiment, the tool change warning signal or the overheating warning signal includes but is not limited to sound warning, photoelectric warning, etc.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A milling machine processing system for special-shaped parts with branch nozzles, the part is hemispherical, and has two branch nozzles and two circular ramps on the outer contour, and four square bosses are evenly distributed at 90° around the periphery, and the square boss has an upper end face, two mutually parallel side end faces and a front end face, the upper end face is parallel to the bottom plane of the part, and the two side end faces and the front end face are perpendicular to the bottom plane of the part, characterized in that: The system comprises: Machine tool drive module; An arm assembly connected to the machine tool drive module, the arm assembly comprising a first arm and a second arm drivingly connected to the end of the first arm, the first arm being movable horizontally and vertically, and the second arm being rotatable and self-rotatable about a direction perpendicular to the axis of the first arm; an edge-finding module, comprising an edge-finding device for detachably connecting to the second arm, a coordinate system establishing unit, and a path generating unit; A processing module comprises a radial tool holder detachably connected to the second arm and a tool detachably connected to the radial tool holder; wherein, The coordinate system establishment unit is used to establish a processing coordinate system through the edge finder and the arm assembly, and the processing coordinate system realizes one-time processing and forming of the branch nozzle along the axial direction of the branch nozzle; The path generation unit is used to perform edge finding operation according to the machining coordinate system and through the edge finder in cooperation with the arm assembly, obtain edge finding data, and generate a tool path corresponding to the machining process according to the edge finding data; The radial tool holder comprises a base, a sliding mechanism and a mounting rod for mounting a tool, wherein the base is detachably connected to the end of the second arm, and the sliding mechanism is arranged on the base and can drive the mounting rod to move in a direction perpendicular to the axial direction of the second arm; The machine tool driving module is used to control the vertical movement of the first arm and the rotation of the second arm according to the tool path, and the sliding mechanism drives the mounting rod to move to the processing position.

2. The milling machine processing system for special-shaped parts with branch nozzles according to claim 1, characterized in that: The coordinate system establishment unit performs the following steps: S10, obtaining a blank, wherein the blank is formed with a bottom plane, an outer cylindrical surface, four square bosses and a branch nozzle blank, and fine-machining the bottom plane and the outer cylindrical surface of the blank by a vertical lathe, and fine-machining the upper end surface, both side end surfaces and the front end surface of the square boss, and the end surface of the branch nozzle blank by a milling machine; S20, the second arm is equipped with an edge finder to determine an initial coordinate system in cooperation with the spherical center of the blank and the end surface of the square boss; S30, rotating the blank to an angle corresponding to the nozzle blank through a milling machine turntable, and rotating the initial coordinate system until its Z axis coincides with the center line of the nozzle blank to form a second coordinate system; S40, place the end face of the edge finder against the end face of the branch nozzle blank to obtain the Z value of the end face of the branch nozzle blank in the second coordinate system; replace the second arm with a processing module, and make the tool end face of the processing module against the end face of the bevel nozzle, reset the Z axis 0 position of the second coordinate system according to the Z value, and obtain the final processing coordinate system.

3. The milling machine processing system for special-shaped parts with branch nozzles according to claim 2, characterized in that: S20: the second arm is equipped with an edge finder, which cooperates with the spherical center of the blank and the end surface of the square boss to determine an initial coordinate system, including: S21, rotating the blank to the B-axis 0 position, installing an edge finder on the second arm, and placing the edge finder against two side end surfaces of the square boss, and taking the center of the two positions of the edge finder as the X-axis 0 position; S22, the side of the edge finder is placed against the upper end surface of the square boss, and the angle between the side of the edge finder and the upper end surface is equal to the angle between the branch nozzle of the part and the center axis of the part, and the position where the edge finder moves downward by a distance Z is the Z axis 0, Z = H0 + D / 2 × SIN (α); S23, the edge finder keeps its angle unchanged, and its side is pressed against the front end surface of the square boss, and the edge finder is moved toward the center axis of the blank by a distance Y to the Y axis 0 position, Y=L0+D / 2×COS(α); S24, establishing the initial coordinate system according to the X-axis 0 position, the Y-axis 0 position, and the Z-axis 0 position; Among them, D is the diameter of the edge finder, H0 is the distance between the upper end face of the square boss and the center of the blank, α is the angle between the branch nozzle of the part and the center axis of the part, and L0 is the distance between the front end face of the square boss and the center of the blank.

4. The milling machine processing system for special-shaped parts with branch nozzles according to claim 1, characterized in that: The base extends in a direction perpendicular to the axial direction of the second arm and is detachably connected to the end of the second arm with the axis of the second arm as the center line; The sliding mechanism comprises a driving member and a screw transmission assembly arranged along the extension direction of the base and connected in transmission. The screw transmission assembly is provided with a sliding block, and the mounting rod is provided on the side of the sliding block away from the base.

5. The milling machine processing system for special-shaped parts with branch nozzles according to claim 4, characterized in that: The base is connected to the second arm via a connecting handle, and a conductive slip ring is further provided between the connecting handle and the base, and the machine tool drive module is connected to the drive member via the conductive slip ring.

6. The milling machine processing system for special-shaped parts with branch nozzles according to claim 4, characterized in that: The connecting handle is a conical handle, and the small end of the connecting handle is connected to the second arm, and the large end of the connecting handle is connected to the base.

7. The milling machine processing system for special-shaped parts with branch nozzles according to claim 1, characterized in that: A dust cover is provided on one side of the base corresponding to the sliding mechanism, and the dust cover is provided with an avoidance groove corresponding to the sliding path of the sliding mechanism to allow the installation rod to move.

8. The milling machine processing system for special-shaped parts with branch nozzles according to claim 1, characterized in that: The tool is a turning tool.

9. The milling machine processing system for special-shaped parts with branch nozzles according to any one of claims 1 to 8, characterized in that: Also includes a monitoring module, the monitoring module is used to monitor the distance b between the blade of the tool and the mounting rod; The machine tool driving module determines the processing position according to the distance b and the tool path, and the processing position is the distance a between the mounting rod and the axis of the second arm; The monitoring module or the machine tool driving module is further configured to issue a tool change warning signal in response to the spacing b being smaller than a first threshold.

10. The milling machine processing system for special-shaped parts with branch nozzles according to any one of claims 1 to 8, characterized in that: Also includes a monitoring module, the monitoring module is used to monitor the blade temperature of the tool; The machine tool driving module controls the rotation speed of the second arm according to the temperature.

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