A processing method for casting cylindrical open frame

Abstract

The present application discloses a method for processing a cast cylindrical open-type skeleton, belonging to the field of mechanical processing technology. The cylindrical open-type skeleton includes a main body, multiple arched skeletons, and multiple process bosses. The processing method includes: placing a blank on a work surface and leveling it through its side edges and end faces; fixing the blank and rough milling and fine milling the process bosses on both sides; correcting and fixing the blank with the process bosses as a reference, and rough milling the outer contour and inner contour; in a free state, detecting the contour and deformation of the blank, and performing artificial aging to form a semi-finished part; correcting and fixing the semi-finished part with the process bosses as a reference, and rough milling the outer contour; correcting and fixing the semi-finished part with the process bosses as a reference, and fine milling the inner contour and outer contour in multiple times. The present application can quickly position the structure, avoid deformation during the casting process, reduce deformation of the final molded product, improve product quality, and improve processing efficiency.

Description

Technical Field

[0001] The present application belongs to the field of mechanical processing technology, and in particular relates to a processing method for a casting cylindrical open-type skeleton. Background Art

[0002] As a structural element, a cylinder usually refers to a structure with a cylindrical shape composed of multiple parts or components. The skeleton serves as the foundation to provide support for the cylinder, making it easier for the cylinder to be combined into the final cylindrical structure. This structure can not only withstand vertical gravity loads, but also effectively transmit and disperse horizontal forces. It has a wide range of applications in many fields.

[0003] Cylindrical skeleton castings have their unique advantages, especially investment castings, which can be arbitrarily complex in shape and can be formed as a whole with almost no or even no allowance. Their performance and reliability are comparable to those of plastic deformation components, and their manufacturing cost and production cycle are significantly better than those of plastic deformation components.

[0004] However, once the size of the existing cylinder skeleton is larger than a certain value and the thickness is thin, such as a large thin-walled cylinder, the size is generally in the range of 1200mm to 1500mm in length, 400mm to 600mm in width, 350mm to 500mm in height, and the wall thickness is generally in the range of 2mm to 4mm. During casting, structural deformation is prone to occur. At the same time, deformation will cause inaccurate positioning of the cylinder skeleton, which will further aggravate the problem of structural deformation of the final product. Summary of the Invention

[0005] The present application aims to solve the technical problem of deformation of the cylindrical skeleton structure at least to a certain extent. To this end, the present application provides a processing method for a cast cylindrical open-type skeleton, which can quickly position the structure, avoid deformation during the casting process of the structure, reduce the deformation of the final molded product, improve product quality, and at the same time improve processing efficiency.

[0006] The embodiment of the present application provides a method for processing a cast cylindrical open-type frame, wherein the cylindrical open-type frame includes a main body, a plurality of arched frames, and a plurality of process bosses. An open groove extending from one end to the other end is opened on one side of the main body, and the plurality of arched frames are arranged at intervals from one end to the other end of the main body. The two ends of the arched frames are connected to the main body at relative positions of the open groove. The plurality of process bosses are connected to the main body at intervals and are located at the edges of the open groove. The processing method includes:

[0007] Place the blank of the cylindrical open frame on the work surface, level the sides and both ends of the blank, and draw the outline;

[0008] Fix the blank with its opening groove facing upward, and roughly mill the process bosses on both sides of the blank and then fine mill the process bosses;

[0009] Use the process boss as a reference to calibrate and fix the blank, and perform rough milling on the outer and inner contours of the blank, leaving a 2mm±0.1mm allowance;

[0010] In the free state, the contour and deformation of the blank are detected, and artificial aging is performed to form a semi-finished part;

[0011] Using the process boss as a reference, calibrate and fix the semi-finished part, and perform rough milling on the outer contour of the semi-finished part, leaving a 1mm±0.1mm allowance;

[0012] The semi-finished part is corrected and fixed based on the process boss, and the inner and outer contours of the semi-finished part are fine-milled in multiple times, leaving allowances in turn, and the allowances are gradually reduced to zero.

[0013] In an optional embodiment, rough milling of the outer contour and the inner contour of the blank includes:

[0014] Fix the blank upside down with the opening groove facing downward, use the process boss as a reference for calibration, and then roughly mill the outer contour of the blank;

[0015] Fix the blank with the open slot facing upward, use the side of the process boss as a reference for correction, and then roughly mill out the inner contour of the blank in the open slot.

[0016] In an optional embodiment, the rough milling and fine milling process of the boss include the following steps:

[0017] Fill the gap between the blank and the work surface, fix it after coordinating the processing allowance, roughly mill out multiple process bosses, and drill process holes;

[0018] Measure the outer contour of the blank at a fixed point, obtain the xyz coordinates, and compare the measured data with the theoretical model. Adjust the blank for alignment at the corresponding deviation between the measured data and the theoretical model.

[0019] Through the dotting method of the machine tool, the xyz coordinates of each part of the outer contour of the blank are made consistent with the theoretical model;

[0020] Perform fine milling on the process boss.

[0021] In an optional embodiment, rough milling the outer contour of the blank includes the following steps:

[0022] The two end faces of the blank are used as reference for calibration to ensure that the deviation between the outer contour of the blank and the theoretical model is less than or equal to 0.2mm;

[0023] The outer contour of the blank is rough milled, and the outer contour includes the convex surface, two end faces and two side faces of the blank.

[0024] In an optional embodiment, rough milling the inner contour of the blank includes the following steps:

[0025] Correction is performed through the side of the process boss, and the y-axis of the machine tool is divided into the sides of multiple process bosses;

[0026] Correction is performed through the plane of the process boss, and the x-axis of the machine tool takes data from the two end faces of the blank;

[0027] Fix the blank and rough mill its inner contour.

[0028] In an optional embodiment, when finishing the outer contour or inner contour of the semi-finished part, the following steps are included:

[0029] Fix and align the semi-finished component so that the opening slot faces downwards; or fix and align the semi-finished component so that the opening slot faces upwards;

[0030] The outer contour or inner part of the semi-finished part is fine-milled in n times, with allowances reserved from 1 to n-1 times, and the allowances are gradually reduced in each time.

[0031] In an optional embodiment, when fine milling the outer contour of the semi-finished component, the processing is performed in the order of the convex surface, the two sides and the end face.

[0032] In an optional embodiment, it further includes:

[0033] Milling process boss to make the outer contour of the semi-finished part transition smoothly;

[0034] The milling position is fine-milled at least twice, with a reserve left before the last one and the reserve gradually reduced, and finally fine-milled to the corresponding size of the model.

[0035] In an optional embodiment, when fixing the blank or semi-finished part, the arched frame is always free of force; if the opening slot faces downward, a clamp is placed on the work surface, and the process boss is fixed to the clamp to space the arched frame from the clamp.

[0036] In an optional embodiment, it also includes: when the cylindrical open-type skeleton is in a free state, detecting the contour and deformation of the cylindrical open-type skeleton, and if the contour of the cylindrical open-type skeleton deviates from the model, performing fine milling on the deviated portion to form the cylindrical open-type skeleton.

[0037] It can be seen from the above technical solution that the beneficial effects of this application are:

[0038] The present application processes process bosses on both sides of the blank first to provide a reference for subsequent processing, and then fine-mills the process bosses to ensure subsequent positioning accuracy. The blank is then fixed with the process boss position reference to complete the rough milling of the outer and inner contours, and preliminarily form the outer and inner shapes corresponding to the theoretical model. Then, through artificial aging, a semi-finished part is formed. Since the process bosses are located on both sides of the blank and are distributed in multiple locations, the other parts of the blank are never in contact with the work surface or other fixed tools. Therefore, during the processing, the forces acting on other parts of the blank are avoided, such as the arched skeleton is not in contact with the force, which significantly reduces the pressure on the blank. The impact of the blank; then the outer contour and inner contour of the semi-finished part are fine-milled based on the process boss. The process boss can not only quickly and accurately position the semi-finished part, but also reduce the impact on the overall structure during the fine milling process. Through graded fine milling, the force of the milling tool on the semi-finished part each time can be controlled within a smaller range, and the milling amount each time is small, the temperature can be controlled and will not be too high, further reducing the impact of processing on the overall structure. In this way, the present application can quickly position the structure, avoid deformation during the casting process of the structure, reduce the deformation of the final molded product, improve product quality, and at the same time improve processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other embodiments and drawings can be obtained based on these drawings without any creative work.

[0040] Figure 1 A schematic diagram of an embodiment of an open-cylinder frame according to the present invention is shown;

[0041] Figure 2 A schematic diagram of an embodiment of step S1 of a method for processing a cast cylindrical open-type skeleton according to the present invention is shown;

[0042] Figure 3 A schematic diagram showing an embodiment of step S3 or S5 of the method for processing a cast cylindrical open-type skeleton according to the present invention;

[0043] Figure 4 A schematic diagram of an embodiment of step S4 of a method for processing a cast cylindrical open-type skeleton according to the present invention is shown;

[0044] Figure 5 A schematic diagram of an embodiment of step S6 of the method for processing a cast cylindrical open-type skeleton according to the present invention is shown;

[0045] Figure 6 A schematic diagram of an embodiment of step S7 of the method for processing a cast cylindrical open-type skeleton according to the present invention is shown;

[0046] Figure numerals: 10, cylindrical open frame; 11, main body; 12, arched frame; 13, process boss; 14, open groove; 20, work surface; 30, tooling; 40, pressing block; 50, fixture; 51, support block. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0048] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship and movement status of various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0049] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0050] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] The present application is described below with reference to specific embodiments and in conjunction with the accompanying drawings:

[0052] Please refer to Figure 1The first embodiment of the present application provides a method for processing a cast cylindrical open-type skeleton. The cylindrical open-type skeleton 10 includes a main body 11, multiple arched skeletons 12 and multiple process bosses 13. The cylindrical open-type skeleton 10 can be made of titanium alloy, aluminum alloy or other alloys. This method is more suitable for processing cylindrical skeletons made of high-strength materials. One side of the main body 11 is provided with an open groove 14 extending from one end to the other end. As shown in the figure, an open groove 14 is provided on one side of the top surface of the main body 11. A plurality of arched frames 12 are arranged at intervals from one end to the other end of the main body 11. For example, 4 arched frames 12 are provided, or other numbers of at least two can be provided. The arched frames 12 are arched and can be semicircular or part of a circle. Both ends of the arched frames 12 are connected to the relative positions of the open groove 14 of the main body 11. As shown in the figure, the arched frames 12 span the open groove 14 and protrude from the top surface of the main body 11. The arched frames 12 can be integrally formed with the main body 11, or can be fixed with screws or bolts. A plurality of process bosses 13 are connected to the main body 11 at intervals and are located at the edges of the open groove 14. The number of process bosses 13 is 10-20, such as 7 pairs of 14 process bosses 13 are symmetrically provided on both sides of the main body 11. During processing, a machine tool with a rough milling tool and a fine milling tool is used. The milling operation is performed by the tool. The program path can be set before the operation. The machine tool processing is based on existing technology. The processing methods include:

[0053] Please refer to Figure 2 S1. Place the blank of the cylindrical open-type skeleton 10 on the work surface 20, level the side and end faces of the blank, and draw the contour line; before placing the blank, first perform a conventional size inspection of the casting blank and check the distribution of the blank allowance to ensure that it meets the processing standards; when placing the blank, align the side of the blank to ensure that the process boss 13 to be processed is located on the same plane during subsequent casting, and then level the end faces at both ends of the main body 11, and finally confirm the position of the characteristic boss inside the open groove 14, and ensure that the alignment error is less than or equal to 0.2mm before drawing the contour line; when drawing the contour line, use the tool of the machine tool to engrave it, or use other conventional methods to engrave it, or use the fitter to draw the line, according to the rough step and evenly distribute the allowance of the product design drawing, draw the contour line, and determine the position to be processed.

[0054] S2, fix the blank so that its open groove 14 faces upward, roughly mill out the process bosses 13 on both sides of the blank and then finely mill the process bosses 13; when fixing the blank, the tooling 30 and the pressing block 40 can be used for fixing, the tooling 30 can be an existing free-standing tooling 30, the top surface of the tooling 30 serves as the work table 20, and the two ends or both sides of the tooling 30 are fixed with chucks, the chucks have threaded holes and can be fixed to the tooling 30 by screws, so that it is convenient to fix the blank on the work table 20, at this time, the open groove 14 faces upward, and the arched skeleton 12 is located above the main body 11; when fixing the blank, the gap between the bottom of the blank and the work table 20 is padded, and at least A pressing block 40 presses the blank to fix it. The pressing block 40 is in a block shape and is equipped with screws. If the main body 11 has a hole or opening running through the top and bottom, the pressing block 40 can be placed at the hole or the opening, and then the pressing block 40 is fixed to the main body 11 with screws, thereby achieving the fixation of the main body 11. The expected flatness of the process boss 13 is remeasured online, and after coordinating the machining allowance, 14 process bosses 13 are milled out on the edges of the opening groove 14 on both sides of the main body 11. The process boss is a block protruding from the side of the main body 11. The upper surface of the process boss 13 is rough-milled, smoothed according to the model, and a process hole is drilled. The process hole is a threaded hole, and then the process boss 13 is fine-milled to ensure the machining accuracy of the upper surface and side edges.

[0055] Please refer to Figure 3 , S3, use the process boss 13 as a reference to calibrate and fix the blank, and rough mill the outer contour and inner contour of the blank, leaving a 2mm±0.1mm allowance; control the machining allowance at 2mm±0.1mm; during rough milling, fix the blank on the work table 20, fix it with the tooling 30, or fix it with the fixture 50. After fixation, recheck the dimensions of each part of the outer contour. Multiple measuring points can be set, and the actual coordinate values ​​of each measuring point are measured by the machine tool and compared with the values ​​of the theoretical model; check the uniformity of the allowance of the blank, and rough mill the convex surface and both end faces of the blank. The convex surface is the side opposite to the arched skeleton 12, which is the top surface of the blank when the opening groove 14 of the blank is facing downward. Avoid the pressing block 40 during rough milling, and reserve a 2mm allowance on the single side of the main body 11 to ensure that 90% of the area can be seen from the light and the overall metallic luster.

[0056] Please refer to Figure 4S4. In a free state, the contour and deformation of the blank are detected, and artificial aging is performed to form a semi-finished product. In the above process, the blank is fixed. At this time, the fixed state is released, such as by removing the above-mentioned pressing block 40 and the above-mentioned chuck. In this way, the blank is only placed on the work table 20 without restriction. At this time, the outer contour of the blank is detected again, and the deformation is detected to ensure that the difference between the coordinate value of each measuring point of the blank and the coordinate value of the theoretical model is within the error range; then the blank is artificially aged. Artificial aging refers to the operation of maintaining a certain temperature above room temperature for a certain period of time to improve its mechanical properties. Artificial aging can shorten the processing time by controlling factors such as heating temperature and holding time, eliminate or reduce the microstress and machining residual stress in the steel after quenching, and prevent deformation and cracking. This process is a prior art.

[0057] Please refer to Figure 3 , S5, use the process boss 13 as a reference to calibrate and fix the semi-finished part, and rough mill the outer contour of the obtained semi-finished part, leaving a 1mm±0.1mm margin; connect the process boss 13 with the support block 51, and the support block 51 is connected to the fixture 50, such as using screws to pass through the process holes to connect and fix each process boss 13 with the corresponding support block 51. Since each support block 51 is pre-designed, the top surface of each support block 51 is located on the same plane, thus completing the correction and fixation of the semi-finished part, and rough milling the outer contour of the semi-finished part, controlling the machining allowance to 1mm to ensure uniform reservation, and use a rough milling tool to rough mill the convex surface, both end faces and side edges, thus completing the secondary rough milling of the outer contour, avoiding the process boss 13, the pressure block 40 and the chuck during rough milling.

[0058] Please refer to Figure 5 , S6, calibrate and fix the semi-finished part with the process boss 13 as the reference, and perform fine milling on the inner and outer contours of the obtained semi-finished part in multiple times, leaving allowances in turn, and the allowances are gradually reduced to zero, and the inner and outer contours are fine milled at least twice respectively, and fine milling needs to be performed in two different fixing processes. Specifically, the semi-finished part is fixed on the work table 20 in the above manner, at this time the open groove 14 faces upward, and fine milling of the inner contour is performed; or the semi-finished part is inverted and fixed on the support block 51 of the fixture 50, at this time the open groove 14 faces downward, and fine milling of the outer contour is performed. During fine milling, the machining allowance is controlled at 0.3±0.05mm for the first time, and then gradually reduced each time. The last time, no allowance is left and the part is directly processed into place, and finally the part is formed.

[0059] Please refer to Figure 6, S7, when the cylindrical open-type skeleton 10 is in a free state, detect the outline and deformation of the cylindrical open-type skeleton 10, that is, in the same way as in the above step S4, release the fixed state so that the cylindrical open-type skeleton 10 is not restricted. If the outline of the cylindrical open-type skeleton 10 deviates from the model, that is, the coordinates of the measuring point deviate from the coordinates of the corresponding point of the model, then the deviated part is fine-milled, which mainly includes deburring and finishing to form the cylindrical open-type skeleton 10, and finally comprehensively detect the size.

[0060] The existing technology of cylindrical skeleton processing is prone to structural deformation problems. At the same time, deformation will cause inaccurate positioning of the cylindrical skeleton, which will further aggravate the problem of structural deformation of the final product. This is mainly caused by the structure of the cylindrical skeleton: (1) The cylindrical skeleton has a large aspect ratio, a grid structure, thin walls, and weak rigidity; (2) The cylindrical skeleton has many dimensional coordination relationships. In the casting processing of the cylindrical skeleton, there are also the following reasons: First, the elastic modulus of the part material is low, resulting in a large rebound after deformation under load, causing the structural parts to deviate from the tool during the machining process; second, the chemical activity of the part material is high and the affinity is large. When the cutting temperature is high, the cutting and cut surfaces bite with the tool material, resulting in a more serious sticking phenomenon, causing severe adhesion and wear of the tool. Especially for large cylindrical skeletons with thin walls, this makes it easy to deform the skeleton structure during production.

[0061] For the skeleton corresponding to the large thin-walled cylinder, the present application can solve the above-mentioned deformation problem. The size of the large thin-walled cylinder is generally in the range of 1200mm to 1500mm in length, 400mm to 600mm in width, and 350mm to 500mm in height. The wall thickness is generally in the range of 2mm to 4mm, including the end point values. The present application first processes the process boss 13 on both sides of the blank to provide a reference for subsequent processing, and then fine-mills the process boss 13 to ensure the subsequent positioning accuracy. The blank is then fixed with the process boss 13 as the reference, and the rough milling of the outer and inner contours is completed to preliminarily form the outer and inner shapes corresponding to the theoretical model. Then, through artificial aging, a semi-finished part is formed. Since the process boss 13 is located on both sides of the blank and is distributed in multiples, the other parts of the blank are always not in contact with the work table 20 or other When the fixed tools are in contact with each other, the force on other parts of the blank is avoided during the processing, such as the arch frame 12 is not in contact with the force, which significantly reduces the impact on the blank; then the outer contour and inner contour of the semi-finished part are fine-milled based on the process boss 13. The process boss 13 can not only quickly and accurately position the semi-finished part, but also reduce the impact on the overall structure during the fine milling process. Through graded fine milling, the force of the milling tool on the semi-finished part each time can be controlled within a smaller range, and the milling amount each time is small, the temperature can be controlled and will not be too high, further reducing the impact of the processing on the overall structure. In this way, the present application can quickly position the structure, avoid deformation during the casting process of the structure, reduce the deformation of the final molded product, improve product quality, and at the same time improve processing efficiency.

[0062] In an optional embodiment, when rough milling the outer contour and inner contour of the blank, it includes: fixing the blank upside down so that the opening groove 14 faces downward, correcting it with the process boss 13 as a reference, fixing each process boss 13 on the corresponding support block 51, and then rough milling the outer contour of the blank. The pressure block 40 can be used to fix the process boss 13 and the inner wall of the main body 11; fixing the blank so that the opening groove 14 faces upward, correcting it with the side of the process boss 13 as a reference, making the side of each process boss 13 consistent with the positioning point of the machine tool, and then rough milling the inner contour of the blank in the opening groove 14. The aforementioned outer contour includes the convex surface, end faces, and side faces of the blank. The aforementioned inner contour is the internal shape of the main body 11 at the opening groove 14, including the inner profile, rib grooves, grooves, reinforcing ribs, and feature bosses. The feature bosses serve as the reference for positioning. During rough milling, all parts of the inner contour are smoothed to ensure the flatness of the inner profile, rib grooves, and grooves. Note that when machining the inner contour during rough milling or subsequent fine milling, the pressure block 40 is removed. During the aforementioned calibration, the x-axis data in the machine tool data readings are taken from the end faces of the main body 11 as the reference points, and the y-axis data are taken from the side edges of the process bosses 13 as the reference points.

[0063] In an optional embodiment, the rough milling and fine milling process of the boss 13 includes the following steps:

[0064] The gap between the blank and the work table 20 is filled, and the machining allowance is coordinated and then fixed. Coordination refers to the process of alignment to ensure that all rough milling locations have machining allowances. Along both sides of the product structure, a plurality of process bosses 13 are roughly milled on the edges of the opening slot 14 and on both sides of the main body 11, such as 7 groups of 14 in total, and process holes are drilled on the process bosses 13. The process holes can be threaded holes that pass through both sides of the process bosses 13. The outer contour of the blank is measured at a fixed point. Each point is a measurement point predetermined by the machine tool. The xyz coordinates of each measurement point are obtained, and the measurement data are compared with the theoretical model. The coordinates are compared with the coordinates of the corresponding points of the theoretical model to find out the deviation, and the blank is adjusted to align the corresponding points where the deviation between the measured data and the theoretical model; the xyz coordinates of the outer contour of the blank are made consistent with the theoretical model through machine tool dotting, specifically referring to the coordinates of each measuring point and the coordinates of the corresponding points of the theoretical model, to ensure that there is no deviation and allow a certain error; the process boss 13 is fine-milled, and the fine milling process needs to process the shape of the process boss 13 so that the top surfaces of the process boss 13 are on the same plane, and the side edges of the process boss 13 on both sides are on the same straight line.

[0065] In an optional embodiment, rough milling the outer contour of the blank includes the following steps: calibration is performed using both end faces of the blank as a reference to ensure that the outer contour of the blank deviates from the theoretical model by less than or equal to 0.2 mm; that is, both end faces of the blank and each process boss 13 are used as a reference for calibration. The outer contour of the blank is rough milled, and the outer contour includes the convex surface, end faces, and two side faces of the blank. These rough milling operations can be performed separately in any order. In an optional embodiment, when rough milling the inner contour of the blank, the following steps are included: correction is performed through the side of the process boss 13, and the y-axis of the machine tool takes numbers at the center of the side of multiple process bosses 13; correction is performed through the plane of the process boss 13, and the x-axis of the machine tool takes numbers at the center of the two end faces of the blank; taking numbers at the center is a method commonly used in the milling process of the machine tool, which involves the correspondence between the machine tool coordinate system and the workpiece coordinate system, and the precise determination of the position of the workpiece in the machine tool; the blank is fixed, and its inner contour is rough milled, that is, the above-mentioned inner shape, rib grooves, etc. are rough milled, and processing allowances are reserved to preliminarily process the internal shape of the main body 11.

[0066] In an optional embodiment, when finishing the outer contour or inner contour of the semi-finished part, the following steps are included:

[0067] The semi-finished part is clamped and corrected so that the opening groove 14 faces downward. The same operation as in the rough milling process is used. The semi-finished part is fixed by a fixture 50 and a support block 51, and the correction is performed through the contact surface between the process boss 13 and the support block 51; or the semi-finished part is fixed and corrected so that the opening groove 14 faces upward. The tooling 30 is also used to fix the two ends or both sides of the semi-finished part by a chuck; the outer contour or the inner part of the semi-finished part is fine-milled for n times, of which 1 to n-1 times reserve allowances, and the allowances are gradually reduced with each time. For example, fine milling is performed in 2 times. When fine milling the outer contour, the opening groove 14 is fixed downward. When fine milling the inner contour, the opening groove 14 is fixed upward. When fine milling the outer contour of the semi-finished part, the processing is carried out in the order of the convex surface, the two sides and the end face.

[0068] In an optional embodiment, after performing step S6:

[0069] Milling process boss 13 makes the outer contour of the semi-finished part transition smoothly. The process boss 13 is designed by this method. After finishing milling, the process boss 13 needs to be removed, and the opening slot 14 is facing upward. The semi-finished part after finishing milling is fixed by the above-mentioned tooling 30. Each process boss 13 is milled to ensure a smooth transition of the milling position and a smooth outer contour of the product. The milling position is finished at least twice. Before the last time, a margin is reserved and the margin is gradually reduced. For example, each milling position is finished to form a semi-finished arc surface, leaving a margin of 0.2mm, and then a second finishing milling is performed. Finally, the finishing milling is performed to the corresponding size of the model. Please refer to Figure 5 After removing the process boss 13, step S7 is required to perform fine milling on the deviated parts, including deburring and finishing. At this time, the cylindrical open-type skeleton 10 is inverted and a custom tooling is used. The top surface of the tooling is a work table 20. A support connecting plate is installed on the work table 20. The top of the support connecting plate can be set to a flat plate shape. The tops of multiple support connecting plates are just in close contact with the inner contour surface of the main body 11. In this way, the cylindrical open-type skeleton 11 is fixed and supported by multiple support connecting plates, which facilitates the processing of this step.

[0070] In an optional embodiment, when fixing a blank or semi-finished part, the arched frame 12 is always free of stress. If the opening slot 14 faces downward, a clamp 50 is placed on the work surface 20, and the process boss 13 is fixed to the clamp 50, so that the arched frame 12 is spaced apart from the clamp 50. As shown in the figure, a clamp 50 is used, and the top surface of the clamp 50 serves as the work surface 20. The clamp 50 is equipped with support blocks 51. There are 14 support blocks 51, and the top surfaces are all located on the same plane, corresponding to the positions of the 14 process bosses 13. The support blocks 51 are welded to the work surface 20, and the tops of the support blocks 51 are provided with threaded holes. When fixing a blank or semi-finished part, the process boss 13 can be aligned with each support block 51, and then each process boss 13 can be fixed to the corresponding support block 51 using screws through the process holes. This completes the precise positioning of the structure, and at this time, the arched frame 12 is in contact with the support blocks 51 and is also free of stress. Another form of support block 51 can also be provided, which is connected to the middle of the fixture 50. Multiple support blocks 51 are arranged at intervals so that when the opening slot 14 faces downward, the top surface of the support block 51 can support the inner contour of the blank or semi-finished part.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "optional example" or "optional implementation" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0072] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0073] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for processing a cast cylindrical open frame, characterized in that: The cylindrical open-type skeleton comprises a main body (11), a plurality of arched skeletons (12) and a plurality of process bosses (13), wherein an open groove (14) extending from one end to the other end is opened on one side of the main body (11), the plurality of arched skeletons (12) are arranged at intervals from one end to the other end of the main body (11), the two ends of the arched skeleton (12) are connected to the relative positions of the open groove (14) of the main body (11), and the plurality of process bosses (13) are connected to the main body (11) at intervals and are located at the edge of the open groove (14). The processing method comprises: Placing the blank of the cylindrical open-type skeleton on a work surface (20), leveling the side edges and end faces of the blank, and marking the outline; Fix the blank so that the opening groove (14) faces upward, and roughly mill out process bosses (13) on both sides of the blank and then fine mill them; The blank is corrected and fixed based on the process boss (13), and the outer contour and inner contour of the blank are roughly milled, leaving a margin of 2 mm ± 0.1 mm; In a free state, the contour and deformation of the blank are detected, and artificial aging is performed to form a semi-finished part; The semi-finished part is corrected and fixed with the process boss (13) as a reference, the outer contour of the obtained semi-finished part is roughly milled, leaving a margin of 1 mm ± 0.1 mm, and the process boss (13) is connected to the support block (51), and the support block (51) is connected to the fixture (50), and the top surfaces of each support block (51) are located on the same plane; The semi-finished part is corrected and fixed with the process boss (13) as a reference, and the inner contour and outer contour of the semi-finished part are fine-milled in multiple times, with allowances left in sequence, and the allowances are gradually reduced to zero.

2. The method for processing a casting cylindrical open frame according to claim 1, characterized in that: When rough milling the outer contour and the inner contour of the blank, it includes: Fix the blank upside down so that the opening groove (14) faces downward, perform correction using the process boss (13) as a reference, and then roughly mill the outer contour of the blank; The blank is fixed so that the opening groove (14) faces upward, and the side of the process boss (13) is used as a reference for correction, and then the inner contour of the blank in the opening groove (14) is roughly milled.

3. The method for processing a casting cylindrical open frame according to claim 2, characterized in that: The rough milling and fine milling of the process boss (13) include the following steps: Filling the gap between the blank and the work surface (20), fixing after coordinating the machining allowance, roughly milling out a plurality of the process bosses (13), and drilling process holes; Measure the outer contour of the blank at a fixed point to obtain xyz coordinates, compare the measured data with the theoretical model, and adjust the blank for alignment at the corresponding deviation between the measured data and the theoretical model; The xyz coordinates of each part of the outer contour of the blank are made consistent with the theoretical model by machining with a machine tool dotting method; The process boss (13) is subjected to fine milling.

4. The method for processing a casting cylindrical open frame according to claim 2, characterized in that: When rough milling the outer contour of the blank, the following steps are included: Calibration is also performed based on the two end faces of the blank to ensure that the deviation between the outer contour of the blank and the theoretical model is less than or equal to 0.2 mm; The outer contour of the blank is subjected to rough milling, and the outer contour includes the convex surface, two end faces and two side faces of the blank.

5. The method for processing a casting cylindrical open frame according to claim 2, characterized in that: When rough milling the inner contour of the blank, the following steps are included: Correction is performed through the side of the process boss (13), and the y-axis of the machine tool is divided into multiple sides of the process boss (13); Correction is performed through the plane of the process boss (13), and the x-axis of the machine tool takes data from the middle of the two end faces of the blank; The blank is fixed and its inner contour is roughly milled.

6. The method for processing a casting cylindrical open frame according to claim 1, characterized in that: When finishing the outer contour or inner contour of the semi-finished part, the following steps are included: Clamping and fixing the semi-finished component and calibrating the semi-finished component so that the opening slot (14) faces downward; or fixing and calibrating the semi-finished component so that the opening slot (14) faces upward; The outer contour or the interior of the cylindrical open-type skeleton is finely milled in n times, wherein allowances are reserved in 1 to n-1 times, and the allowances are gradually reduced in each time.

7. The method for processing a casting cylindrical open frame according to claim 6, characterized in that: When fine milling the outer contour of the semi-finished part, the processing is carried out in the order of the convex surface, the two sides and the end face.

8. The method for processing a casting cylindrical open frame according to any one of claims 1 to 7, characterized in that: Also includes: Milling the process boss (13) to achieve a smooth transition of the outer contour of the semi-finished component; The milling position is fine-milled at least twice, with a reserve left before the last one and the reserve gradually reduced, and finally fine-milled to the corresponding size of the model.

9. The method for processing a casting cylindrical open-type skeleton according to claim 1, characterized in that: When the blank or the semi-finished part is fixed, the arched frame (12) is always free from stress; if the opening groove (14) faces downward, a clamp (50) is placed on the work surface (20), and the process boss (13) is fixed to the clamp (50), so that the arched frame (12) and the clamp (50) are spaced apart.

10. The method for processing a casting cylindrical open frame according to claim 1, characterized in that: Also includes: When the cylindrical open-type skeleton is in a free state, the outline and deformation of the cylindrical open-type skeleton are detected. If the outline of the cylindrical open-type skeleton deviates from the model, the deviated part is fine-milled to form the cylindrical open-type skeleton.

Images