CN116021234A - Frame section part machining method - Google Patents
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- CN116021234A CN116021234A CN202211425948.2A CN202211425948A CN116021234A CN 116021234 A CN116021234 A CN 116021234A CN 202211425948 A CN202211425948 A CN 202211425948A CN 116021234 A CN116021234 A CN 116021234A
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Abstract
The invention discloses a frame part machining method which comprises the specific steps of die forging blank, checking and scribing, first rough machining, ultrasonic flaw detection, checking and scribing, trimming a reference bottom surface and drilling a reference hole, second rough machining, aging treatment, trimming the reference bottom surface and the reference hole, finish milling the bottom surface, finish milling a grid cavity, drilling and blanking, and finished product inspection. According to the invention, through analyzing the structure and manufacturability of the special-shaped frame section of the titanium alloy, the processing technology of the special-shaped frame section of the titanium alloy is optimized and improved in the aspects of rough processing part stability, cutter use stability, finishing efficiency, quality and operator interactivity, and the pre-correction measures of a web empty thin area pressing device, a cutter verification table, a finish milling two-order butt joint plane and the like are provided, so that the problems of the characteristics of the titanium alloy material and the stress lateral bending and warping of the semicircular frame section are solved, and references are provided for manufacturing products with similar structures.
Description
Technical Field
The invention relates to the field of manufacturing of aviation parts, in particular to a frame section part machining method.
Background
In the relevant bearing stress key parts such as the framework of an aircraft body, the titanium alloy has the characteristics of light weight, high specific strength, high heat resistance, good corrosion resistance and the like, the density of the titanium alloy is usually about 4.5 g/cm < 3 >, and the minimum alloy steel is 7.9g/cm < 3 >, which is about 1.75 times that of the titanium alloy. The strength of the titanium alloy is far higher than that of a plurality of alloy structural steels, the specific strength (strength/density) of the titanium alloy is far higher than that of other metal structural materials, and the manufactured part has the characteristics of high unit strength, good rigidity and light weight and is widely applied to the aerospace field. However, titanium alloy often has oxidation reaction with oxygen, nitrogen, carbon dioxide and other substances in the air to form an oxide film protective layer with high strength and hardness, and the intrinsic damping resistance is low, so that the deformation coefficient is less than or equal to 1. The cutting processing is particularly difficult when the hardness of the titanium alloy is higher than HB350, and the cutter sticking phenomenon is easy to occur when the hardness is lower than HB300, so that the abrasion of aluminum scraps generated during the cutting processing of the titanium alloy to the cutter is far higher than that of the conventional alloy. For the processing of the parts with large removal amount of the frame section, the process analysis and arrangement are not perfect enough, so that larger vibration can be generated in the cutting process, the cutting heat is concentrated at the cutting point, the abrasion of the cutter is increased, the cutter becomes blunt, the cutting force is increased, and the processing quality of the parts is influenced to cause overlarge deformation of the parts. Therefore, for better optimization and control of the titanium alloy milling process, how to effectively solve the milling force and the process stability in the milling process of the titanium alloy frame section part is extremely important.
As shown in FIG. 1, the part of the titanium alloy frame section of the certain aircraft is in a semicircular and double-sided frame structure, and the material is Ti6Al4V. In the process of trimming, if the allowance of the part is removed unevenly, the process design is unreasonable, and the part is easy to warp and deform; part of the web is empty and thin, the metal removal amount is large in the milling process, local dimensional stress is accumulated, and the empty and thin part of the web is warped or collapsed; the milling strength of the arc part is poor, the stress release deflection strength is poor after rough machining, the side bending of the part is caused, and the arc size is enlarged.
Disclosure of Invention
The invention provides a frame section part processing method, which solves the following technical problems:
(1) The defects of large allowance of a rough machining plane, large allowance of a rough machining side wall, secondary rough machining plane trimming, fine machining plane trimming, large cutting depth of a fine machining side wall and poor finish machining rapid cutting machinability of the titanium alloy material are overcome.
(2) The problem of inaccurate position of special-shaped products in forging blanks is solved.
(3) The defect that the forging blank is milled to remove large allowance and the generated part stress is warped is overcome.
(4) The problem that the large allowance of the side wall is removed by milling of the forging blank is solved, and the service life of the cutter is prolonged by corner wrapping.
(5) The stress warpage and lateral bending of the parts generated after the forging blank is coarsely opened and the material fiber direction is damaged are overcome.
(6) The method overcomes the problem that residual stress of the forging part is released slowly in the finish machining process, and the generated part is warped and bent sideways.
(7) The method solves the problem of rapid processing of the product, and ensures the surface roughness Ra3.2 of the product.
(8) The influence of milling vibration on the surface quality of the part is solved.
(9) The problem that repeated clamping errors of special-shaped parts are large and accumulated clamping errors are easy to cause is solved.
(10) The problem that local stress deformation is generated under the conditions of clamping extrusion, insufficient large-area pressing force and the like of the web plate of the special-shaped part is solved.
(11) Solves the problem of wrong use of the cutter, and generates milling over-cutting or under-cutting of the part.
(12) The problem of part tearing caused by gravity pulling of a boss in the transfer process is solved.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a processing method of a frame section part comprises the following steps:
s1, picking up a die forging blank;
s2, checking and scribing: checking and scribing the die forging blank, scribing the thickness center line of the part blank by using a height ruler and an inking mode, and scribing the maximum solid contour line of the part by using a scribing cutter on a numerical control machine tool;
s3, rough machining for the first time: machining the upper surface and the lower surface of a blank by adopting a side top clamping mode of a numerical control milling pressing plate, wherein a margin of 6mm is reserved on one side in the thickness direction of a part, and the parallelism of the upper plane and the lower plane of a workpiece is not more than 0.20mm;
s4, ultrasonic flaw detection: after finishing the first rough machining, carrying out ultrasonic flaw detection on the workpiece, and marking a casting defect area after the ultrasonic flaw detection on the workpiece;
s5, checking and scribing, repairing the reference bottom surface and drilling the reference hole: a marking knife is used for carrying out second checking marking on the numerical control machine tool, a reference hole and a screw countersink of the part are processed by the numerical control machine tool, a screw is arranged in the screw countersink, a workpiece and a machine tool workbench are connected and locked, and the workpiece is fixed;
s6, performing secondary rough machining: the machining coordinate system is arranged at the pin hole at the left end of the part, an inner type cavity of the part is machined by adopting a numerical milling machining mode on the outer side wall of the part, and the milling machining mode is adopted;
s7, machining an inner mold cavity: machining an inner part mold cavity by adopting a fast feed milling cutter in a down milling mode, roughly machining the side wall of the inner part mold cavity and the unilateral allowance of ribs by 3mm, reserving allowance of 2mm on the bottom surface, and machining support columns and support ribs in the inner part mold cavity;
s8, aging treatment: after finishing the second rough machining, the part is detached from the machine tool workbench and placed on the platform for natural aging;
s9, repairing the reference bottom surface and drilling a reference hole: the method comprises the steps of placing a part on a workbench of a numerical control machine tool horizontally, adopting two screws to be respectively arranged on the left end face and the right end face of the part, attaching the end face of the part to the cylindrical surface of a screw head, attaching the end face of a pressing plate to the side face of the part at other positions, completely limiting the freedom degrees of the part in the X and Y directions, adopting a plane milling cutter to trim a reference face, a process boss supporting face and a pin hole of the part, wherein the single-face removal amount is larger than the buckling deformation amount, and finishing the removal allowance by 0.30mm;
s10, finish milling of the bottom surface: adjusting a machining coordinate system to the part arc central axis, detecting the diameter of a tool to be used, the clamping length of the tool and the corner rounding of the tool nose by using a tool checking table, and then finish milling the bottom surface of the part;
s11, finish milling a grid cavity (3): clamping the part by using a clamping tool, and finish milling the grid cavity (3) of the part;
s12, drilling and blanking, wherein the part and the clamping tool are not split, and the whole part is transferred to a five-axis numerical control machining center; milling the butt joint surface through a whole hard end mill, detecting the position state of the part, adjusting the processing coordinate system of the part, and drilling the positioning hole on the outer side wall of the part after the special elbow and the special drill bit are adopted to pass trial drilling; blanking and milling process table;
s13, checking a finished product: and (5) checking whether each index of the part is qualified.
The specific method for processing the upper and lower surfaces of the blank in the first rough machining in the step S3 is as follows: when the upper surface and the lower surface of a blank are processed by numerical control milling, a face milling cutter with a large diameter and a large nose fillet is adopted along the fiber direction of the blank, the diameter phi of the milling cutter is 63mm, and the nose fillet R is 8mm; 177 r/min of the main shaft revolution of the machine tool; feed speed 214 mm/min; cutting width 40mm; rough finishing cutting depth 1.30mm, finishing cutting depth 0.30mm.
The concrete steps of processing the countersunk holes of the screws in the step S5 are as follows: and (3) processing 15 screw countersunk holes uniformly or symmetrically distributed along the outline of the part by adopting a numerical control machine tool, wherein the distance between the center of the countersunk hole and the boundary of the part is 50-60 mm, the distance between the wall surface of the screw countersunk hole and the surface of the screw head is kept 4-5 mm, the depth of the countersunk step hole is not less than 3mm compared with the length of the screw head, and the distance between the screw rod and the side wall of the through hole is 2-3 mm.
The specific method for processing the exterior sidewall in the step S6 is as follows: milling an exterior side wall by adopting a corn milling cutter, wherein machining parameters with low rotation speed and large feeding amount, a cutter path and an exterior contour of a part are processed in an oblique angle mode, the part is left with a unilateral allowance of 3mm, 15 process bosses are milled at positions of a screw countersunk hole, the machining parameters are specifically cutter diameter phi 32mm, and a cutter tip fillet R3.1mm; the revolution of the main shaft of the machine tool is 398 r/min; the feeding speed is 143 mm/min; cutting width 6mm; the depth of cut was 18mm.
The step S11 comprises the following sub-steps:
s1101, finish milling a grid cavity surface, namely milling parallel surfaces of an XZ axis plane and a YZ axis plane on the side wall of each process boss by adopting a full hard end mill with a cutter diameter phi 16mm and a cutter tip fillet R1mm, detecting specific offset values of the finish milling two sequences by using a lever dial indicator, and judging whether the part is clamped to be qualified or not according to measurement data;
s1102, rechecking the abutting state of the parts: removing 0.50mm of the inner side wall of the part by adopting a finish milling cutting mode, setting a thickness gauge to detect the detection size, and adjusting a part machining coordinate system according to the actual result of detecting the part;
s1103, designing a compacting device in the web empty thin area;
s1104, finely milling the side wall of the inner cavity by adopting a pre-clear corner mode, adopting a milling mode of large-cutting depth and small-cutting width similar to cycloid milling, and finally trimming the outer side wall of the milling shape by using 0.80mm radial layered milling of each layer when finely milling the side wall.
The specific method for drilling in the step S12 is as follows: drilling a positioning hole on the outer side wall of the part after the special elbow and the special drill bit pass trial drilling; the body process parameters are as follows: cutter type hard alloy drill bit, cutter diameter phi 3mm, cutter angle 140 degrees; machine tool spindle revolution 1260 r/min; the feeding speed is 35 mm/min; the cutting depth is 2mm, and the blanking method specifically comprises the following steps: and milling the connection part of the process boss and the part according to the sequence from top to bottom and from outside to inside.
The invention has the advantages and beneficial effects that:
by analyzing the structure and manufacturability of the special-shaped frame section of the titanium alloy, the processing technology of the special-shaped frame section of the titanium alloy is optimized and improved in the aspects of rough processing part stability, cutter use stability, finish processing efficiency, quality and operator interactivity, and pre-correction measures such as a web empty thin area pressing device, a cutter checking table and a finish milling two-order butt joint plane are provided, the problems of titanium alloy material characteristics and semicircular frame section stress lateral bending and warping are solved, and references are provided for manufacturing products with similar structures.
Drawings
FIG. 1 is a schematic diagram of the product of the present invention
FIG. 2 is a schematic view of a boss screw sinking station in accordance with the present invention;
FIG. 3 is a schematic representation of a milling zone of the present invention;
FIG. 4 is a schematic view of bevel milling according to the present invention;
FIG. 5 is a schematic view of a grid cavity support column and support ribs of the present invention;
fig. 6 is a schematic blanking diagram of the present invention.
In the figure, a 1-exterior side wall, a 2-interior type cavity, a 3-grid type cavity, 4-supporting ribs, 5-supporting columns, 6-process bosses, 7-pin holes, 8-screw countersunk holes and 9-web empty thin areas.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
1-6, a processing method of a frame section part comprises the following steps:
s1, picking up a die forging blank;
s2, checking and scribing: checking and scribing the die forging blank, scribing the thickness center line of the part blank by using a height ruler and an inking mode, and scribing the maximum solid contour line of the part by using a scribing cutter on a numerical control machine tool;
s3, rough machining for the first time: machining the upper surface and the lower surface of a blank by adopting a side top clamping mode of a numerical control milling pressing plate, wherein a margin of 6mm is reserved on one side in the thickness direction of a part, and the parallelism of the upper plane and the lower plane of a workpiece is not more than 0.20mm;
s4, ultrasonic flaw detection: after finishing the first rough machining, carrying out ultrasonic flaw detection on the workpiece, and marking a casting defect area after the ultrasonic flaw detection on the workpiece;
s5, checking and scribing, repairing the reference bottom surface and drilling the reference hole: performing second checking and scribing on the numerical control machine by using a scribing cutter, machining a reference hole and a screw countersink 8 of the part by using the numerical control machine, installing the screw in the screw countersink 8, connecting and locking a workpiece and a machine tool workbench, and fixing the workpiece;
s6, performing secondary rough machining: the machining coordinate system is arranged at the pin hole 7 at the left end of the part, the external side wall 1 of the part is machined by adopting a numerical milling mode, and the milling mode is adopted;
s7, machining the inner die cavity 2: adopting a fast feed milling cutter, machining an inner part mold cavity 2 in a down milling mode, roughly machining the side wall of the inner part mold cavity 2 and the unilateral allowance of ribs by 3mm, reserving allowance of 2mm on the bottom surface, and machining a support column 5 and a support rib 4 in the inner part mold cavity 2;
s8, aging treatment: after finishing the second rough machining, the part is detached from the machine tool workbench and placed on the platform for natural aging;
s9, repairing the reference bottom surface and drilling a reference hole: the method comprises the steps of (1) horizontally placing a part on a workbench of a numerical control machine tool, respectively installing two screws on the left end face and the right end face of the part, attaching the end face of the part to the cylindrical surface of a screw head, attaching the end faces of pressing plates to the side faces of the part at other positions, completely limiting the freedom degrees of the part in the X and Y directions, trimming a reference face of the part, a supporting face of a process boss 6 and a pin hole 7 by adopting a face milling cutter, wherein the single-face removal amount is larger than the buckling deformation amount, and the finishing machining removal allowance is 0.30mm;
s10, finish milling of the bottom surface: adjusting a machining coordinate system to the part arc central axis, detecting the diameter of a tool to be used, the clamping length of the tool and the corner rounding of the tool nose by using a tool checking table, and then finish milling the bottom surface of the part;
s11, finish milling the grid cavity 3: clamping the part by using a clamping tool, and finish milling the grid cavity 3 of the part;
s12, drilling and blanking, wherein the part and the clamping tool are not split, and the whole part is transferred to a five-axis numerical control machining center; milling the butt joint surface by a whole hard end mill, detecting the position state of the part, adjusting the processing coordinate system of the part, and drilling a positioning hole on the outer side wall 1 of the part after the special elbow and the special drill bit are adopted to pass trial drilling; blanking and milling process table;
s13, checking a finished product: and (5) checking whether each index of the part is qualified.
The specific method for processing the upper and lower surfaces of the blank in the first rough machining in the step S3 is as follows: when the upper surface and the lower surface of a blank are processed by numerical control milling, in order to improve the processing efficiency and the surface quality of parts, the parts are processed along the fiber direction of the blank under the condition of not damaging the internal tissue structure of the blank, a face milling cutter with a large diameter and a large nose fillet is adopted, the diameter phi of the milling cutter is 63mm, and the nose fillet R is 8mm; 177 r/min of the main shaft revolution of the machine tool; feed speed 214 mm/min; cutting width 40mm; rough finishing surface cutting depth is 1.30mm, finish finishing surface cutting depth is 0.30mm, and if the diameter of the cutter is small, the part machining efficiency is low, and the cost is high; if the nose fillet is small, the nose shock resistance is insufficient, the cutting edge of the cutter is easy to crack, and the processing of the part is unqualified and even scrapped.
The concrete steps of processing the countersunk holes 8 of the screws in the step S5 are as follows: 15 screw countersunk holes 8 which are uniformly or symmetrically distributed are processed along the outline of the part by adopting a numerical control machine tool, the distance between the center of each countersunk hole and the boundary of the part is 50-60 mm, the screw distance is set to be more than 60mm, the pressing force cannot effectively overcome cutting vibration, the roughness of the part is poor after long-time vibration, the screws are easy to loosen, and the part is shifted and cut excessively and scrapped; the distance between the screw and the surface of the screw head is kept between 4mm and 5mm, the internal stress of the workpiece is released after rough machining to generate deformation, the countersunk hole position is shifted, if the countersunk hole diameter is too small, the hole wall surface is easily in extrusion contact with the cylindrical surface of the screw to cause serious stress concentration, the subsequent machining quality is influenced, the stressed area of the screw for pressing the workpiece is ensured to be enough, the workpiece does not move in the machining process, the countersunk step hole depth is not less than 3mm compared with the length of the screw head, and the distance between the screw and the side wall of the through hole is 2mm to 3mm.
The specific method for processing the exterior sidewall 1 in the step S6 is as follows: milling an exterior side wall 1 by adopting a corn milling cutter, wherein machining parameters with low rotation speed and large feeding amount, a cutter path and an exterior contour of a part are processed in an oblique angle mode, the part is left with a unilateral allowance of 3mm, 15 process bosses 6 are milled at positions of a screw countersunk hole 8, the machining parameters are specifically the cutter diameter phi 32mm, and a cutter tip fillet R3.1mm; the revolution of the main shaft of the machine tool is 398 r/min; the feeding speed is 143 mm/min; cutting width 6mm; the cutting depth is 18mm, the process boss is in right-angle connection with the part, the phenomenon of three bread cutters is generated by right-angle milling, the problems of rapid increase of the power of a machine tool spindle, rapid vibration of a cutter and the like are caused, and the service life of the machine tool spindle, the service life of the cutter and the surface quality of the part are affected. The conventional solution is to improve the milling right angle into a larger round angle, reduce the feeding amount, and achieve the purpose of protecting the main shaft of the machine tool, but increase the milling time and cost. Milling is carried out by adopting a mode that the cutter path and the outline of the part form an oblique angle, so that the processing problem is solved.
The step S11 comprises the following sub-steps:
s1101, finish milling a grid cavity 3 surface, namely milling a parallel surface of an XZ axis plane and a YZ axis plane on the side wall of each process boss 6 by adopting a full-hard end mill with a cutter diameter phi 16mm and a cutter tip fillet R1mm, detecting specific offset values of the finish milling two sequences by using a lever dial indicator, and judging whether the part is clamped to be qualified or not according to measured data;
s1102, rechecking the abutting state of the parts: removing 0.50mm of the inner side wall of the part by adopting a finish milling cutting mode, setting a thickness gauge to detect the detection size, and adjusting a part machining coordinate system according to the actual result of detecting the part;
s1103, designing a pressing device in the web empty thin area 9;
s1104, finish milling the side wall of the inner cavity by adopting a pre-clear corner mode, adopting a milling mode of large-cutting depth and small-cutting width similar to cycloid milling, and using each layer of radial layered milling with the diameter of 0.80mm to finish the milling of the outer side wall 1 with the diameter of 0.10 mm.
The specific method for drilling and blanking in the step S12 is as follows: drilling a positioning hole on the outer side wall 1 of the part after the special elbow and the special drill bit pass trial drilling; the body process parameters are as follows: cutter type hard alloy drill bit, cutter diameter phi 3mm, cutter angle 140 degrees; machine tool spindle revolution 1260 r/min; the feeding speed is 35 mm/min; the cutting depth is 2mm, and the blanking method specifically comprises the following steps: and milling the connection part of the process boss 6 and the part according to the sequence from top to bottom and from outside to inside.
The present invention has been described in detail with reference to the drawings and the embodiments, but the present invention is not limited to the embodiments described above, and various changes can be made within the scope of those skilled in the art without departing from the spirit of the present invention. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. The processing method of the frame section part is characterized by comprising the following steps of:
s1, picking up a die forging blank;
s2, checking and scribing: checking and scribing the die forging blank, scribing a thickness center line of the part blank by using an inking and height ruler, and scribing a maximum solid contour line of the part by using a scribing cutter on a numerical control machine tool;
s3, rough machining for the first time: machining the upper surface and the lower surface of a blank by adopting a side top clamping mode of a numerical control milling pressing plate, wherein a margin of 6mm is reserved on one side in the thickness direction of a part, and the parallelism of the upper plane and the lower plane of a milling workpiece is not more than 0.20mm;
s4, ultrasonic flaw detection: after finishing the first rough machining, carrying out ultrasonic flaw detection on the workpiece, and marking a casting defect area after the ultrasonic flaw detection on the workpiece;
s5, checking and scribing, repairing the reference bottom surface and drilling the reference hole: performing second checking and scribing on the numerical control machine by using a scribing cutter, machining a reference hole and a screw countersink (8) of the part by using the numerical control machine, installing the screw in the screw countersink (8), connecting and locking a workpiece and a machine tool workbench, and fixing the workpiece;
s6, performing secondary rough machining: the machining coordinate system is arranged at a pin hole (7) at the left end of the part, an external side wall (1) of the part is machined by adopting a numerical milling mode, and an internal cavity (2) of the part is machined by adopting a direct milling mode;
s7, processing an inner type cavity (2): adopting a fast feed milling cutter, machining an inner part mold cavity (2) in a down milling mode, roughly machining the single side allowance of 3mm of the side wall and the ribs of the inner part mold cavity (2), reserving allowance of 2mm of the bottom surface, and machining support columns (5) and support ribs (4) in the inner part mold cavity (2);
s8, aging treatment: after finishing the second rough machining, the part is detached from the machine tool workbench and placed on the platform for natural aging;
s9, repairing the reference bottom surface and drilling a reference hole: the method comprises the steps of placing a part on a workbench of a numerical control machine tool horizontally, adopting two screws to be respectively arranged on the left end face and the right end face of the part, attaching the end face of the part to the cylindrical surface of a screw head, attaching the end face of a pressing plate to the side face of the part at other positions, completely limiting the freedom degrees of the part in X and Y directions, adopting a plane milling cutter to trim a reference surface of the part, a supporting surface of a process boss (6) and a pin hole (7), enabling single-sided removal amount to be larger than buckling deformation amount, and enabling finishing machining removal allowance to be 0.30mm;
s10, finish milling of the bottom surface: adjusting a machining coordinate system to the part arc central axis, detecting the diameter of a tool to be used, the clamping length of the tool and the corner rounding of the tool nose by using a tool checking table, and then finish milling the bottom surface of the part;
s11, finish milling a grid cavity (3): clamping the part by using a clamping tool, and finish milling the grid cavity (3) of the part;
s12, drilling and blanking, wherein the part and the clamping tool are not split, and the whole part is transferred to a five-axis numerical control machining center; milling the butt joint surface through a whole hard end mill, detecting the position state of the part, adjusting the processing coordinate system of the part, and drilling a positioning hole on the outer side wall (1) of the part after the special elbow and the special drill bit are adopted to pass trial drilling; blanking and milling process table;
s13, checking a finished product: and (5) checking whether each index of the part is qualified.
2. The method for machining a frame part according to claim 1, wherein the specific method for machining the upper and lower surfaces of the blank in the first rough machining in step S3 is as follows: when the upper surface and the lower surface of a blank are processed by numerical control milling, a face milling cutter with a large diameter and a large nose fillet is adopted along the fiber direction of the blank, the diameter phi of the milling cutter is 63mm, and the nose fillet R is 8mm; 177 r/min of the main shaft revolution of the machine tool; feed speed 214 mm/min; cutting width 40mm; rough finishing cutting depth is 1.30mm, and finishing cutting depth is 0.30mm.
3. The method for machining the frame section part according to claim 1, wherein the specific step of machining the screw counter bore (8) in the step S5 is as follows: and processing 15 screw countersunk holes (8) uniformly or symmetrically distributed along the outline of the part by adopting a numerical control machine tool, wherein the distance between the center of the countersunk holes and the boundary of the part is 50-60 mm, the distance between the wall surface of the screw countersunk holes (8) and the surface of the screw head is kept 4-5 mm, the depth of the countersunk step holes is not less than 3mm higher than the height of the screw head, and the distance between the screw rod and the side wall of the through hole is 2-3 mm.
4. The method for machining a frame section part according to claim 1, wherein the specific method for machining the exterior sidewall (1) in step S6 is as follows: milling an exterior side wall (1) by adopting a corn milling cutter, wherein machining parameters with low rotation speed and large feeding amount, a cutter path and an exterior contour of a part are processed in an oblique angle mode, the part is left with a unilateral allowance of 3mm, 15 process bosses (6) are milled at positions of screw countersunk holes (8), and the machining parameters are specifically the cutter diameter phi 32mm and the cutter tip fillet R3.1mm; the revolution of the main shaft of the machine tool is 398 r/min; the feeding speed is 143 mm/min; cutting width 6mm; the depth of cut was 18mm.
5. A method of machining a frame segment part according to claim 1, wherein step S11 comprises the sub-steps of:
s1101, finish milling a grid cavity (3) surface, namely milling a parallel surface of an XZ axis plane and a YZ axis plane on the side wall of each process boss (6) by adopting a full-hard end mill with a cutter diameter phi 16mm and a cutter tip fillet R1mm, detecting specific offset values of the finish milling two sequences by using a lever dial indicator, and judging whether the part is clamped to be qualified or not according to measurement data;
s1102, rechecking the abutting state of the parts: removing 0.50mm of the inner side wall of the part by adopting a finish milling cutting mode, setting a thickness gauge to detect the detection size, and adjusting a part machining coordinate system according to the actual result of detecting the part;
s1103, designing a compacting device in the web empty thin area (9);
s1104, finish milling the side wall of the inner cavity by adopting a pre-clear corner mode, adopting a milling mode of large-cutting depth and small-cutting width similar to cycloid milling, and milling the outer side wall (1) by using radial layered milling with each layer of 0.80mm and finishing processing with 0.10 mm.
6. The method for machining a frame section part according to claim 1, wherein the specific method for drilling in step S12 is as follows: drilling a positioning hole on the outer side wall (1) of the part after the special elbow and the special drill bit pass trial drilling; the specific process parameters are as follows: cutter type hard alloy drill bit, cutter diameter phi 3mm, cutter angle 140 degrees; machine tool spindle revolution 1260 r/min; the feeding speed is 35 mm/min; cutting depth 2mm; the blanking method specifically comprises the following steps: and milling the connection part of the process boss (6) and the part according to the sequence from top to bottom and from outside to inside.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116551335A (en) * | 2023-07-07 | 2023-08-08 | 成都飞机工业（集团）有限责任公司 | L-shaped part machining method and L-shaped part |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116551335A (en) * | 2023-07-07 | 2023-08-08 | 成都飞机工业（集团）有限责任公司 | L-shaped part machining method and L-shaped part |
| CN116551335B (en) * | 2023-07-07 | 2023-10-03 | 成都飞机工业（集团）有限责任公司 | L-shaped part machining method and L-shaped part |
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