Precise hole lug piece and manufacturing method of high-edge-strip titanium alloy rib part

Abstract

The invention discloses a precise hole lug piece and a manufacturing method of a high-edge-strip titanium alloy rib part, and relates to the technical field of forging. According to the specific technical scheme disclosed by the invention, the method comprises the steps of reaming a process hole, clamping a high-edge strip surface, roughly machining a part lug surface, roughly machining the part high-edge strip surface, naturally aging, semi-finishing the part lug surface, finishing the part lug surface, reaming a side wall precision hole of the part lug surface, semi-finishing the part high-edge strip surface, and finishing the part high-edge strip surface. And measuring the size of the part, and removing the process patch and the patch on the two sides. The machining method effectively solves the problem of machining precision holes in the side walls of the lug pieces of the parts, the problem of vibration of the high-edge-strip parts in the machining process and the problem of residual closed angles of the parts, meanwhile, deformation of the parts in the machining process can be controlled, and then the size and precision of the parts are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a method for manufacturing precision hole ear pieces and high edge strip titanium alloy rib parts. Background Art

[0002] A titanium alloy rib part of an aircraft is made of TA15. One side of the part is an ear piece, the ear piece is about 85mm high, and an H9-level precision hole needs to be opened on the side wall of the ear piece. The hole coaxiality is 0.1, and the dimensional tolerance of the hole axis from the part's belly plate surface is ±0.05mm, and the precision requirement is extremely high. The other side of the part is a high edge strip surface, the edge strip is about 135mm high, and the thinnest part of the edge strip is only 2mm, which is difficult to process. There are four major difficulties in processing this part: 1) The accuracy of the side wall hole of the ear piece surface of the part is high, and the size is difficult to guarantee; 2) There is a large closed angle structure on the ear piece surface of the part, with a maximum closed angle of about 50°, which is difficult to process, and the closed angle is difficult to process; 3) The edge strip on the high edge strip surface of the part is high, which is prone to vibration during processing, and it is difficult to formulate a process plan with stable quality and efficient processing; 4) The part has a complex structure and is easy to deform during processing, and the TA15 material is relatively hard, and it will be impossible to correct the shape after deformation. Summary of the invention

[0003] Based on the above background, the technical problem solved by the present invention is to provide a manufacturing process for precision hole ear pieces and high edge strip titanium alloy rib parts to solve the problems in the above background technology.

[0004] In view of this, according to one aspect of an embodiment of the present invention, a method for manufacturing a precision hole ear piece and a high edge strip titanium alloy rib part is provided, wherein one side of the part is an ear piece surface and the other side is a high edge strip surface, comprising:

[0005] Step S01: Clamp the ear surface of the blank, calibrate the blank allowance, determine the position of the process hole on the ear surface, and cut a process hole on the process patch 2-1 on the blank, wherein two process patches 2-1 are welded to the head and tail ends of the blank respectively;

[0006] Step S02: a pressure plate groove for clamping a pressure plate is provided at the side patch block 2-2; wherein a plurality of side patch blocks 2-2 are respectively welded to both sides of the blank;

[0007] Step S03: milling the positioning surface of the process patch block 2-1 and the positioning surface of the side patch block 2-2, and removing the excess;

[0008] Step S04: Positioning with the process hole and the positioning surface of the process patch block 2-1 and the positioning surface of the side patch block 2-2, clamping the pressure plate in the pressure plate groove, and inserting the positioning pin into the process hole to tighten, and then rough machining the ear piece surface, opening and milling the large hole on the web surface of the part to release the machine stress and the residual stress of the blank, and machining the positioning surface of the process patch block 2-1, the positioning surface of the side patch block 2-2 and the web surface of the ear piece to the same height, and ensuring their flatness, and finally expanding and milling the process hole, and milling the inspection edge;

[0009] Step S05: Position the process hole expanded and milled in step S04 and the positioning surface of the process patch block 2-1, the positioning surface of the side patch block 2-2 and the belly plate surface of the ear piece milled in step S04, clamp the pressure plate in the pressure plate groove, insert the positioning pin into the process hole to fasten it, mill the check edge, and make it flush with the check edge milled in step S04, then perform rough machining of the high edge strip surface, mill the positioning surface of the process patch block 2-1 and the positioning surface of the side patch block 2-2, and ensure their flatness, finally expand and mill the process hole, and mill the check edge;

[0010] Step S06: natural aging treatment for at least 24 hours;

[0011] Step S07: Positioning the process hole expanded and milled in step S05 and the positioning surface of the process patch block 2-1 and the positioning surface of the side patch block 2-2 milled in step S05, clamping the pressure plate in the pressure plate groove, inserting the positioning pin in the process hole to fasten, milling the check edge, aligning it with the check edge milled in step S055, and then performing semi-finishing processing on the ear piece surface;

[0012] Step S08: The semi-finished part ear piece surface obtained in step S07 is kept in the clamping position unchanged, and the part ear piece surface is finished, and the positioning surface of the process patch 2-1, the positioning surface of the side patch 2-2 and the belly plate surface of the ear piece are processed to the same height, and finally the process hole is expanded and milled, and the verification edge is milled;

[0013] Step S09: The ear piece surface of the finely machined part obtained in step S08 is kept in the clamping position unchanged, and a powerful milling angle head is used to drill each group of ear piece holes on the part from the same direction, drill the initial holes of each group of ear piece holes on the part, expand and mill each group of ear piece holes on the part, and finely ream each group of ear piece holes on the part;

[0014] Step S10: using the process hole expanded and milled in step S08 and the positioning surface of the process patch block 2-1, the positioning surface of the side patch block 2-2 and the belly plate surface of the ear piece milled in step S08 to position, clamping the pressing plate in the pressing plate groove, inserting the positioning pin in the process hole to fasten, milling the check edge, aligning it with the check edge milled in step S08, and then performing semi-finishing of the high edge strip surface parts;

[0015] Step S11: the semi-finished part high edge strip surface obtained in step S10 is kept in the clamping position unchanged, and the high edge strip surface of the part is finished, and the process patch block 2-1 and the side patch block 2-2 are milled thinly;

[0016] Step S12: measuring the size of the parts;

[0017] Step S13: removing the process patch 2 - 1 and the side patch 2 - 2 .

[0018] Optionally, in step S04, padding is performed below the process patch block 2-1 and the side patch block 2-2, and then rough machining is performed on the ear piece surface to leave a margin, and the process hole is expanded and milled, and the verification edge is milled.

[0019] Optionally, in step S05, padding is performed below the process patch block 2-1 and the side patch block 2-2, and the verification edge is milled to align with the verification edge milled in step S04, and then rough machining is performed to leave a margin on the high edge strip surface, and the process hole is expanded and milled, and the verification edge is milled.

[0020] Optionally, in step S07, padding is performed below the process patch block 2-1 and the side patch block 2-2, and a check edge is milled to align with the check edge milled in step S05, and then semi-finishing is performed on the ear piece surface to leave an allowance.

[0021] Optionally, it also includes: using a plunge milling cutter to plunge mill the arc of the corner of the part and leaving an allowance, wherein a fixed-angle oblique plunge processing method is used at the closed angle of the part.

[0022] Optionally, in step S08, the ear piece surface is finely processed, the process hole is expanded and milled, the verification edge is milled, and the closed angle area is cut off in sections with a spherical solid carbide milling cutter specially made for titanium alloy with a fixed angle.

[0023] Optionally, in step S10, padding is performed below the process patch block 2-1 and the side patch block 2-2, and the verification edge is milled to be flush with the verification edge milled in step S08, and then semi-finishing is performed to leave a margin on the high edge strip surface. Semi-finishing is performed by milling with a fast feed blade and a circular blade equipped with a strong milling cutter rod.

[0024] Optionally, in step S11, the high edge surface of the finely machined part is in place, the upper part of the part edge is side milled using a solid carbide milling cutter, and the lower part is cut at a fixed angle using a combination of a ball cutter and an extended heat shrinkable tool holder.

[0025] The present invention provides a manufacturing process for precision hole ear pieces and high-edge strip titanium alloy rib parts, which effectively solves the problem of precision hole processing on the side wall of the ear piece of the part, the vibration problem of high-edge strip parts during processing, and the problem of residual closed angle of the part, and can control the deformation of the part during processing, thereby ensuring the size and accuracy of the part. In order to save blank materials and improve the efficiency of part processing, the blank is a pre-customized small-residue die forging, and a five-axis high-power milling machine is used for rough processing, semi-finishing and finishing. In order to ensure the accuracy of the ear hole, an angle head is used to process the side wall hole of the ear piece of the part, which effectively avoids the accuracy error caused by the need for secondary clamping when processing the side wall hole with a traditional drilling template. In order to reduce the deformation of the part during processing, the forging blank is designed as an independent small patch block, which avoids the deformation of the part caused by the inability to effectively release the internal stress of the part due to the traditional closed patch block structure, and the large hole on the part is opened during rough processing, and the structure of the part itself is used to release the stress added by the rough processing machine and the residual stress of the blank. In the process of machining, the reference plane is milled many times, the process hole is expanded and milled, and the verification edge is milled. Natural aging is performed after the roughing process to control the deformation of the parts during machining. By selecting suitable tools and heat shrinkable tool holders, optimizing cutting process parameters and tool path strategies, the problems of residual closed angles and machining vibration of parts are effectively solved to ensure the size and accuracy of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the surface clamping of the ear piece in a preferred embodiment of the present invention;

[0027] Figure 2 Schematic diagram of high edge strip surface clamping in a preferred embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1-workpiece; 2-1 ear piece surface process patch; 2-2 ear piece surface side patch; 3-standard pad; 4-ear piece surface profile pad; 5-1 high edge strip surface process patch; 5-2 high edge strip surface side patch; 6-high edge strip surface profile pad. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] According to one aspect of an embodiment of the present invention, a method for manufacturing a precision hole ear piece and a high edge titanium alloy rib part is provided, such as Figure 1-2As shown, one side of the part (i.e., workpiece 1) is an ear surface and the other side is a high edge strip surface, wherein the ear surface process patch 2-1 is a high edge strip surface process patch 5-1, and the ear surface side patch 2-2 is a high edge strip surface side patch 5-2, including:

[0032] Step S01: Clamp the ear surface of the blank, calibrate the blank allowance, determine the position of the process hole on the ear surface, and cut a process hole on the process patch 2-1 on the blank, wherein two process patches 2-1 are welded to the head and tail ends of the blank respectively;

[0033] Step S02: a pressure plate groove for clamping a pressure plate is provided at the side patch block 2-2; wherein a plurality of side patch blocks 2-2 are respectively welded to both sides of the blank;

[0034] Step S03: milling the positioning surface of the process patch block 2-1 and the positioning surface of the side patch block 2-2, and removing the excess;

[0035] Step S04: Positioning with the process hole and the positioning surface of the process patch block 2-1 and the positioning surface of the side patch block 2-2, clamping the pressure plate in the pressure plate groove, and inserting the positioning pin into the process hole to tighten, and then rough machining the ear piece surface, opening and milling the large hole on the web surface of the part to release the machine stress and the residual stress of the blank, and machining the positioning surface of the process patch block 2-1, the positioning surface of the side patch block 2-2 and the web surface of the ear piece to the same height, and ensuring their flatness, and finally expanding and milling the process hole, and milling the inspection edge;

[0036] Step S05: Position the process hole expanded and milled in step S04 and the positioning surface of the process patch block 2-1, the positioning surface of the side patch block 2-2 and the belly plate surface of the ear piece milled in step S04, clamp the pressure plate in the pressure plate groove, insert the positioning pin into the process hole to fasten it, mill the check edge, and make it flush with the check edge milled in step S04, then perform rough machining of the high edge strip surface, mill the positioning surface of the process patch block 2-1 and the positioning surface of the side patch block 2-2, and ensure their flatness, finally expand and mill the process hole, and mill the check edge;

[0037] Step S06: natural aging treatment for at least 24 hours;

[0038] Step S07: Positioning the process hole expanded and milled in step S05 and the positioning surface of the process patch block 2-1 and the positioning surface of the side patch block 2-2 milled in step S05, clamping the pressure plate in the pressure plate groove, inserting the positioning pin in the process hole to fasten, milling the check edge, aligning it with the check edge milled in step S055, and then performing semi-finishing processing on the ear piece surface;

[0039] Step S08: The semi-finished part ear piece surface obtained in step S07 is kept in the clamping position unchanged, and the part ear piece surface is finished, and the positioning surface of the process patch 2-1, the positioning surface of the side patch 2-2 and the belly plate surface of the ear piece are processed to the same height, and finally the process hole is expanded and milled, and the verification edge is milled;

[0040] Step S09: The ear piece surface of the finely machined part obtained in step S08 is kept in the clamping position unchanged, and a powerful milling angle head is used to drill each group of ear piece holes on the part from the same direction, drill the initial holes of each group of ear piece holes on the part, expand and mill each group of ear piece holes on the part, and finely ream each group of ear piece holes on the part;

[0041] Step S10: using the process hole expanded and milled in step S08 and the positioning surface of the process patch block 2-1, the positioning surface of the side patch block 2-2 and the belly plate surface of the ear piece milled in step S08 to position, clamping the pressing plate in the pressing plate groove, inserting the positioning pin in the process hole to fasten, milling the check edge, aligning it with the check edge milled in step S08, and then performing semi-finishing of the high edge strip surface parts;

[0042] Step S11: the semi-finished part high edge strip surface obtained in step S10 is kept in the clamping position unchanged, and the high edge strip surface of the part is finished, and the process patch block 2-1 and the side patch block 2-2 are milled thinly;

[0043] Step S12: measuring the size of the parts;

[0044] Step S13: removing the process patch 2 - 1 and the side patch 2 - 2 .

[0045] A manufacturing process for precision hole ear pieces and high edge strip titanium alloy rib parts. In order to save blank materials and improve part processing efficiency, the blank is a pre-customized small-residue die forging, and a five-axis powerful milling machine is used for rough processing, semi-finishing and finishing. In order to ensure the accuracy of the ear hole, an angle head is used to process the side wall hole of the ear part.

[0046] Furthermore, in step S04, padding is performed below the process patch block 2-1 and the side patch block 2-2, and then rough machining is performed on the ear piece surface to leave a margin, and the process hole is expanded and milled, and the verification edge is milled.

[0047] Furthermore, in step S05, padding is performed below the process patch block 2-1 and the side patch block 2-2, and the verification edge is milled to be flush with the verification edge milled in step S04, and then rough machining is performed to leave a margin on the high edge strip surface, and the process hole is expanded and milled, and the verification edge is milled.

[0048] Furthermore, in step S07, padding is performed below the process patch block 2-1 and the side patch block 2-2, and the check edge is milled to be flush with the check edge milled in step S05, and then semi-finishing is performed to leave an allowance for the ear piece surface.

[0049] Furthermore, it also includes: using a plunge milling cutter to plunge mill the arc of the corner of the part and leaving an allowance, wherein a fixed-angle oblique plunge processing method is used at the closed angle of the part.

[0050] Furthermore, in step S08, the ear piece surface is finely processed, the process hole is expanded and milled, the verification edge is milled, and the closed angle area is segmented and fixed-angled cutter specially made for titanium alloy is used to cut and clear the residue.

[0051] Furthermore, in step S10, padding is performed below the process patch block 2-1 and the side patch block 2-2, and the verification edge is milled to be flush with the verification edge milled in step S08, and then semi-finishing is performed to leave a margin on the high edge strip surface. Semi-finishing is performed by milling with a fast feed blade and a circular blade equipped with a strong milling cutter rod.

[0052] Furthermore, in step S11, the high edge surface of the finely machined part is in place, the upper part of the edge of the part is side milled using a solid carbide milling cutter, and the lower part is cut at a fixed angle using a combination of a ball cutter and an extended heat shrinkable tool holder.

[0053] Example 1

[0054] The parts (i.e., workpiece 1) have one side as an ear surface and one side as a high edge strip surface, wherein the ear surface process patch 2-1 is the high edge strip surface process patch 5-1, and the ear surface side patch 2-2 is the high edge strip surface side patch 5-2. Figure 1-2 As shown in the figure, a manufacturing process for precision hole ear pieces and high edge strip titanium alloy rib parts is used. In order to save blank materials and improve part processing efficiency, the blank is a pre-customized small-residue die forging, and a five-axis powerful milling machine is used for rough processing, semi-finishing and finishing. In order to ensure the accuracy of the ear hole, an angle head is used to process the side wall hole of the ear part. The specific steps are as follows:

[0055] 1) Reaming process holes

[0056] The ear piece surface is clamped, the blank allowance is corrected, the position of the process hole is determined, and the process hole is drilled, expanded and reamed on the blank.

[0057] 2) Open the pressure plate groove

[0058] Pressure plate grooves for clamping pressure plates are opened at the patch blocks on both sides of the blank.

[0059] 3) High edge strip clamping

[0060] The high edge strip surface is clamped, the positioning surface of the process patch block and the positioning surfaces of the patch blocks on both sides are milled, and the excess is removed.

[0061] 4) Rough machining of parts ear surface

[0062] Turn over the blank that has been clamped on the high edge strip surface in step 3), and clamp the ear piece surface. Use the process hole processed in step 1) and the process patch positioning surface and the two side patch positioning surface milled in step 3) to position. Clamp the pressure plate in the pressure plate groove at the patches on both sides of the blank, and insert the positioning pins in the process hole to tighten it to prevent the part from loosening during processing, and then perform rough processing on the ear piece surface. During rough processing, open a large hole on the belly surface of the part and mill through to release the machine stress and the residual stress of the blank. Use the same tool to process the process patch positioning surface, the two side patch positioning surface and the ear piece belly surface to the same height in the same program, and ensure its flatness. Finally, expand the process hole and mill the verification edge.

[0063] 5) Rough machining of high edge surface of parts

[0064] Turn over the blank that has been processed on the ear piece surface in step 4), clamp the high edge strip surface, and position it with the process hole expanded and milled in step 4), the process patch block positioning surface, the two side patch block positioning surface, and the ear piece belly plate surface. Clamp the pressure plate in the pressure plate groove at the patch blocks on both sides of the blank, and insert the positioning pin in the process hole to tighten it to prevent the part from loosening during processing. Mill the check edge to ensure that it is flush with the check edge milled in step 4), then perform rough processing on the high edge strip surface, mill the process patch block positioning surface and the two side patch block positioning surface, and ensure their flatness, finally expand the process hole and mill the check edge.

[0065] 6) Natural aging

[0066] Natural aging for 24 hours is used to release the machining stress caused by material plastic deformation and cutting heat during rough machining.

[0067] 7) Semi-finished parts ear surface

[0068] The ear piece surface is clamped, and the process hole expanded and milled in step 5) and the process patch block positioning surface and the two side patch block positioning surface are used for positioning. The pressure plate is clamped in the pressure plate groove at the patch blocks on both sides of the blank, and the positioning pins are inserted into the process hole to tighten to prevent the parts from loosening during processing. The check edge is milled to ensure that it is flush with the check edge milled in step 5), and then the ear piece surface is semi-finished.

[0069] 8) Finishing parts ear surface

[0070] The semi-finished part ear surface obtained in step 7) keeps its clamping position unchanged, and the part ear surface is finish-machined. The process patch positioning surface, the two side patch positioning surfaces and the ear belly surface are processed to the same height in the same program using the same tool to ensure their flatness. Finally, the process hole is expanded and the verification edge is milled.

[0071] 9) Angle head drilling, expanding and ream precision holes on the side wall of parts ear pieces

[0072] The ear surface of the finely machined part obtained in step 8) is kept in its clamping position unchanged, and a strong milling angle head is clamped on the machine tool to drill each group of ear holes on the part from the same direction, drill the initial holes of each group of ear holes on the part, expand and mill each group of ear holes on the part, and finely ream each group of ear holes on the part into place.

[0073] 10) Semi-finished parts with high edge strips

[0074] Turn over the part that has been processed on the ear surface in step 9) and clamp the high edge strip surface. Use the process hole expanded and milled in step 8) and the process patch positioning surface, the two side patch positioning surface and the ear plate belly surface for positioning. Clamp the pressure plate in the pressure plate groove at the patch on both sides of the part, and insert the positioning pin in the process hole to tighten it to prevent the part from loosening during processing. Mill the check edge to ensure that it is flush with the check edge milled in step 8), and then perform semi-finishing of the high edge strip surface part.

[0075] 11) High edge surface of finely machined parts

[0076] The high edge strip surface of the semi-finished part obtained in step 10) is clamped in the same position, and the high edge strip surface of the part is finished, and finally the process patch and the patch blocks on both sides are milled thin.

[0077] 12) Measuring parts size

[0078] 13) The fitter removes the process patch and the patches on both sides

[0079] In the present invention, in step 4), standard pads and profile pads are used to raise the part patch below, and then the ear piece surface is roughly processed to leave a margin of about 3mm, and the process hole is expanded and milled, and the inspection edge is milled.

[0080] In the present invention, in step 5), a profile pad is used to raise the bottom of the part patch, and the verification edge is milled to ensure that it is flush with the verification edge milled in step 4), and then the high edge strip surface is rough-machined to leave a margin of about 3mm, and the process hole is expanded and milled, and the verification edge is milled.

[0081] In the present invention, in step 7), standard pads and profile pads are used to raise the part patch below, and the check edge is milled to ensure that it is flush with the check edge milled in step 5), and then the ear piece surface is semi-finished with a 0.2-0.5mm margin. In order to improve the processing efficiency of the parts, a plunge milling cutter is used to plunge the arc of the corner of the part in advance, leaving a margin of about 0.2mm, and the closed angle of the part is processed by a fixed angle oblique plunge. The subsequent program only needs to increase the corner arc without the need to reduce the speed of the corner.

[0082] In the present invention, in step 8), the ear piece surface is finely processed, and the process hole is expanded and milled, and the inspection edge is milled. Because the closed angle of the ear piece of the part is relatively large, and the ear piece is about 85mm high, the closed angle is relatively deep, and the conventional milling cutter cannot process the closed angle in place, so a titanium alloy special slope spherical solid carbide milling cutter is selected to cut the closed angle area in sections and at fixed angles to clear the residue, avoid interference in the processing process, improve the processing rigidity, and effectively remove the closed angle residue.

[0083] In the present invention, in step 9), an angle head is used to perform precision hole processing on the side wall of the ear piece, which effectively avoids the precision error caused by the need for secondary clamping when processing the side wall holes with a traditional drilling template, and the processing efficiency is greatly improved.

[0084] In the present invention, in step 10), a profile pad is used to raise the part below the patch, and the check edge is milled to ensure that it is flush with the check edge milled in step 8), and then semi-finishing is performed to leave a 0.2-0.5mm margin on the high edge strip surface. In order to improve the machining rigidity and efficiency of the parts, semi-finishing is performed by milling with a fast feed blade and a round blade equipped with a strong milling cutter rod.

[0085] In the present invention, in step 11), the high edge surface of the finely machined part is in place. Since the edge height of the part is about 135 mm, in order to avoid tool vibration caused by the tool being too long and to improve manufacturing efficiency, the upper part of the part edge is side milled using a solid carbide milling cutter, and the lower part is cut at a fixed angle using a combination of a ball-type cutter and an extended heat shrinkable tool holder.

[0086] Example 2

[0087] The parts (i.e., workpiece 1) have one side as an ear surface and one side as a high edge strip surface, wherein the ear surface process patch 2-1 is the high edge strip surface process patch 5-1, and the ear surface side patch 2-2 is the high edge strip surface side patch 5-2, see Figures 1-2 The manufacturing process of a precision hole ear piece and high edge strip titanium alloy rib part shown in the figure, in order to save blank material and improve part processing efficiency, the blank is a pre-customized small margin die forging, and a five-axis powerful milling machine is used for rough processing, semi-finishing and finishing. In order to ensure the accuracy of the ear hole, an angle head is used to process the side wall hole of the ear part. The specific steps are as follows:

[0088] 1) Clamp the ear piece surface, correct the blank allowance, determine the position of the process hole, and drill, expand, and ream the process hole at the process patch 2-1 on the blank. In order to reduce the deformation of the parts during the processing, the forging blank is designed as an independent small patch, which effectively avoids the deformation of the parts caused by the inability to effectively release the internal stress of the parts due to the traditional closed patch, and saves raw materials.

[0089] 2) Open pressure plate grooves at 2-2 on both sides of the blank for clamping the pressure plate.

[0090] 3) Clamp the high edge strip surface, mill the positioning surface of the process patch 5-1 and the positioning surfaces of the two side patches 5-2, and remove the excess to ensure the flatness of the positioning reference surface for the next process.

[0091] 4) Rough machining of parts ear surface

[0092] Turn over the blank that has been clamped on the high edge strip surface in step 3) and clamp the ear piece surface. Use standard pads 3 and ear piece surface pads 4 to raise the part patch below. Use the process hole processed in step 1) and the process patch positioning surface and the two side patch positioning surfaces milled in step 3) to position. Clamp the pressure plate in the pressure plate groove at the two side patches 2-2, and insert the positioning pin in the process hole at the process patch 2-1 to tighten it to prevent the part from loosening during processing. First, open and mill the large hole on the web surface of the part, leaving a 3mm margin on one side, and use the structure of the part itself to release the rough machining stress and the residual stress of the blank. Then, roughly machine the ear piece surface of the part and leave a margin of about 3mm. Use the same tool to machine the positioning surface of the process patch 2-1 and the positioning surface of the two side patches 2-2 and the web surface of the ear piece to the same height in the same program, and ensure its flatness. Finally, expand the process hole and mill the inspection edge. Machining stress is mainly concentrated on the surface of the material. The main functions of the milling process patch 2-1 positioning surface, the two side patch 2-2 positioning surface and the ear plate belly surface are to remove processing stress, reduce deformation, and ensure the flatness of the positioning reference surface for the next process. The purpose of expanding the process hole is to eliminate hole deformation during processing, ensure the verticality and accuracy of the hole, and thus ensure the accuracy of the next process processing reference. The purpose of milling the check edge is to ensure the processing position accuracy of the next process part, so as to ensure that the front and back surfaces of the part are flat.

[0093] 5) Rough machining of high edge surface of parts

[0094] Turn over the blank that has been processed on the ear piece surface in step 4), clamp the high edge strip surface, use the high edge strip surface pad 6 to raise the bottom of the part patch, and use the process hole expanded in step 4) and the process patch positioning surface milled in step 4) , the two side patch positioning surface and the ear piece belly surface for positioning, clamp the pressure plate in the pressure plate groove at the two side patches 5-2, and insert the positioning pin in the process hole at the process patch 5-1 to tighten it to prevent the part from loosening during processing. Mill the check edge to ensure that it is flush with the check edge milled in step 4), and then process the high edge strip surface. Roughly process the high edge strip surface with a margin of about 3mm, mill the positioning surface of the process patch 5-1 and the positioning surface of the two side patches 5-2 to ensure flatness and expand the process hole, and mill the check edge. The machined stress is mainly concentrated on the surface of the material. The main function of milling the positioning surface of the process patch 5-1 and the positioning surface of the two side patches 5-2 is to remove the processing stress, reduce deformation, and ensure the flatness of the positioning reference surface for the next process. The purpose of expanding and milling the process hole is to eliminate hole deformation during the processing, ensure the verticality and accuracy of the hole, and thus ensure the reference accuracy of the next process. The purpose of milling the check edge is to ensure the position accuracy of the part processing in the next process, so as to ensure that the front and back surfaces of the part are flat.

[0095] 6) Natural aging

[0096] Natural aging for 24 hours is used to release the machining stress caused by material plastic deformation and cutting heat during rough machining.

[0097] 7) Semi-finished parts ear surface

[0098] The ear piece surface is clamped, and the process hole after expansion and milling in step 5) and the process patch block positioning surface and the two side patch block positioning surface are positioned. The standard pad 3 and the ear piece surface pad 4 are used to raise the part patch below, and the pressure plate is clamped in the pressure plate groove at the two side patches 2-2, and the positioning pin is inserted in the process hole to tighten to prevent the part from loosening during processing. Mill the check edge to ensure that it is flush with the check edge milled in step 5), and then semi-finish the ear piece surface. In order to improve the processing efficiency of the part, the milling cutter is used to mill the corner arc of the part in advance, leaving a margin of about 0.2mm, and the fixed angle oblique insertion is used for the closed angle of the part. Then, the welding tooth cutter is used to semi-finish the web and side wall profile of the part, leaving a margin of about 0.2-0.5mm. At this time, because the corner margin has been removed first, the program only needs to increase the corner arc, and there is no need to reduce the speed of the corner, which greatly improves the processing efficiency of the part, and the semi-finished part ear piece surface is obtained.

[0099] 8) Finishing parts ear surface

[0100] The semi-finished part ear surface obtained in step 7) keeps its clamping position unchanged and finishes the part ear surface. The finishing process of the part ear surface is: finish the ear belly surface, the positioning surface of the process patch 2-1 and the positioning surface of the two side patches 2-2 → finish the inner and outer side walls of the ear → clean the ear closed angle residue → expand the process hole → mill the inspection edge.

[0101] The positioning surface of the process patch 2-1, the positioning surfaces of the two side patches 2-2 and the belly plate surface of the ear piece are processed to the same height in the same program using the same tool, and their flatness is guaranteed, thereby ensuring the processing benchmark accuracy of the next process.

[0102] Because the closed angle of the ear of the part is relatively large, and the ear height is about 85mm, the closed angle is relatively deep, and the conventional milling cutter cannot be used to process the closed angle in place. Therefore, a special inclined spherical solid carbide milling cutter for titanium alloy is selected to perform segmented fixed-angle cutting to clear the residue in the closed angle area, avoid interference in the processing process, improve the processing rigidity, and effectively remove the closed angle residue.

[0103] The purpose of hole expansion and milling is to eliminate hole deformation during machining, ensure hole verticality and hole accuracy, and thus ensure the machining benchmark accuracy of the next process.

[0104] The purpose of milling the check edge is to ensure the position accuracy of the part in the next process, so as to ensure that the front and back joints of the part are level.

[0105] 9) Angle head drilling, expanding and ream precision holes on the side wall of parts ear pieces

[0106] The finished part ear surface obtained in step 8) keeps its clamping position unchanged, and the machine tool is clamped with a powerful milling angle head to drill, expand and ream the precision holes on the side wall of the part ear surface. The processing flow is: spot drilling each group of ear holes on the part → drilling each group of ear holes on the part with a 1mm margin on one side → expanding and milling each group of ear holes on the part with a 0.1mm margin on one side → fine ream each group of ear holes on the part in place.

[0107] In order to ensure the coaxiality of the ear hole is 0.1, the dimensional tolerance of the hole axis from the web surface of the part

[0108] ±0.05mm, after the angle head is aligned, the precision holes on the ear pieces are drilled, expanded and reamed from the same direction. During the processing, the angle head always keeps the same position, and only the corresponding tool needs to be replaced. In order to ensure the H9 level precision hole size of the ear piece side wall, a special precision reamer for the ear piece hole is customized, and the hole size is ensured by the tool accuracy.

[0109] The method of drilling side holes with an angle head effectively avoids the precision error caused by the need for secondary clamping when drilling side wall holes with traditional drilling templates, and greatly improves the processing efficiency.

[0110] 10) Semi-finished parts with high edge strips

[0111] Turn over the part that has completed the ear surface processing in step 9), clamp the high edge strip surface, use the high edge strip surface pad 6 to raise the part patch block below, and use the process hole expanded and milled in step 8) and the process patch block positioning surface, side patch block positioning surface and ear plate belly surface for positioning, clamp the pressure plate in the pressure plate groove at the patch block 5-2 on both sides of the part, and insert the positioning pin in the process hole to tighten it to prevent the part from moving during the processing. Mill the check edge to ensure that it is flush with the check edge milled in step 8), and then perform semi-finishing of the high edge strip surface. In order to improve the processing rigidity and efficiency of the parts, semi-finishing is done by milling with fast feed blades and round blades equipped with powerful milling cutter rods.

[0112] 11) High edge surface of finely machined parts

[0113] The semi-finished part high edge strip surface obtained in step 10) keeps its clamping position unchanged and finishes the part high edge strip surface. The finishing process of the part high edge strip surface is: finish the part belly plate surface → finish the upper part of the inner and outer surface of the part → finish the lower part of the inner and outer surface of the part → milling thinning process patch 5-1 and both side patches 5-2.

[0114] Because the part edge strip is relatively high at 135mm, in order to avoid tool vibration caused by too long tool length and improve processing efficiency, the upper part of the part edge strip is side milled with a solid carbide milling cutter, and the lower part is milled with a combination of a ball-type cutter and an extended heat shrinkable tool holder. The fixed-angle cutting method is adopted, which can effectively shorten the tool length, increase the processing rigidity, avoid the vibration caused by the tool being too long and insufficient rigidity during processing, and effectively remove the residues at the edge strip corners and the bottom corners of the web.

[0115] 12) Measure the dimensions of parts.

[0116] 13) The fitter removes the process patch and the patches on both sides.

[0117] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for manufacturing precision hole ear pieces and high edge strip titanium alloy rib parts, characterized in that: The parts have two sides with one ear piece and one high edge strip, including: Step S01: clamping the ear piece surface of the part blank, correcting the blank margin, determining the position of the process hole on the ear piece surface, and cutting a process hole on the process patch (2-1) on the blank, wherein two process patches (2-1) are respectively welded to the head and tail ends of the blank; Step S02: a pressure plate groove for clamping a pressure plate is provided at the side patch block (2-2); wherein a plurality of side patch blocks (2-2) are respectively welded to two sides of the blank; Step S03: milling the positioning surface of the process patch block (2-1) and the positioning surface of the side patch block (2-2), and removing the excess; Step S04: positioning with the process hole and the positioning surface of the process patch block (2-1) and the positioning surface of the side patch block (2-2), clamping the pressure plate in the pressure plate groove, and inserting the positioning pin into the process hole to tighten, and then rough machining the ear piece surface, opening a large hole on the web surface of the part and milling through to release the machine stress and the residual stress of the blank, and machining the positioning surface of the process patch block (2-1), the positioning surface of the side patch block (2-2) and the web surface of the ear piece to the same height, and ensuring their flatness, and finally expanding and milling the process hole and milling the inspection edge; Step S05: using the process hole expanded and milled in step S04 and the positioning surface of the process patch block (2-1), the positioning surface of the side patch block (2-2) and the belly plate surface of the ear plate to position, clamping the pressure plate in the pressure plate groove, inserting the positioning pin into the process hole to fasten, milling the check edge, and aligning it with the check edge milled in step S04, then rough machining the high edge strip surface, milling the positioning surface of the process patch block (2-1) and the positioning surface of the side patch block (2-2), and ensuring their flatness, and finally expanding and milling the process hole and milling the check edge; Step S06: natural aging treatment for at least 24 hours; Step S07: using the process hole expanded and milled in step S05 and the positioning surface of the process patch block (2-1) and the positioning surface of the side patch block (2-2) milled in step S05 to position, clamping the pressure plate in the pressure plate groove, inserting positioning pins in the process hole to fasten, milling the check edge, aligning it with the check edge milled in step S055, and then performing semi-finishing processing on the ear piece surface; Step S08: The semi-finished part ear piece surface obtained in step S07 is kept in the clamping position unchanged, and the part ear piece surface is finished, and the positioning surface of the process patch (2-1), the positioning surface of the side patch (2-2) and the belly plate surface of the ear piece are processed to the same height, and finally the process hole is expanded and milled, and the verification edge is milled; Step S09: The ear piece surface of the finely machined part obtained in step S08 is kept in the clamping position unchanged, and a powerful milling angle head is used to drill each group of ear piece holes on the part from the same direction, drill the initial holes of each group of ear piece holes on the part, expand and mill each group of ear piece holes on the part, and finely ream each group of ear piece holes on the part; Step S10: using the process hole expanded and milled in step S08 and the positioning surface of the process patch block (2-1), the positioning surface of the side patch block (2-2) and the belly plate surface of the ear piece milled in step S08 to position, clamping the pressure plate in the pressure plate groove, inserting the positioning pin in the process hole to tighten, milling the check edge, aligning it with the check edge milled in step S08, and then performing semi-finishing of the high edge strip surface part; Step S11: the semi-finished part high edge strip surface obtained in step S10 is kept in the clamping position unchanged, and the high edge strip surface of the part is finished, and the milling process patch (2-1) and the side patch (2-2) are thinned; Step S12: measuring the size of the parts; Step S13: removing the process patch (2-1) and the side patch (2-2).

2. The method according to claim 1, characterized in that: In step S04, padding is performed below the process patch block (2-1) and the side patch block (2-2), and then rough machining is performed on the ear piece surface to leave a margin, and the process hole is expanded and milled, and the verification edge is milled.

3. The method according to claim 1, characterized in that In step S05, padding is performed below the process patch block (2-1) and the side patch block (2-2), and the verification edge is milled to align with the verification edge milled in step S04, and then rough machining is performed to leave a margin on the high edge strip surface, and the process hole is expanded and milled, and the verification edge is milled.

4. The method according to claim 1, characterized in that: In step S07, padding is performed below the process patch block (2-1) and the side patch block (2-2), and the check edge is milled to align it with the check edge milled in step S05, and then semi-finishing is performed to leave an allowance for the ear piece surface.

5. The method according to claim 4, characterized in that Also includes: Use a plunge milling cutter to mill the corner arc of the part and leave an allowance, and use a fixed-angle oblique plunge processing method at the closed angle of the part.

6. The method according to claim 1, characterized in that In step S08, the ear piece surface is finely processed, the process hole is expanded and milled, the verification edge is milled, and the closed angle area is cut off in sections with a spherical solid carbide milling cutter specially made for titanium alloy to remove the residue.

7. The method according to claim 1, characterized in that In step S10, padding is performed below the process patch block (2-1) and the side patch block (2-2), and the verification edge is milled to align with the verification edge milled in step S08, and then semi-finishing is performed to leave an allowance for the high edge strip surface. Semi-finishing is performed by milling with a fast feed blade and a circular blade equipped with a strong milling cutter rod.

8. The method according to claim 1, characterized in that In step S11, the high edge surface of the part is finished, the upper part of the part edge is side milled using a solid carbide milling cutter, and the lower part is cut at a fixed angle using a combination of a ball cutter and an extended heat shrinkable tool holder.

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