A processing method of a waist muscle locking piece

Abstract

The application provides a waist muscle lock piece processing method, comprising the following steps: blanking a blank into an I-shaped part; completing the bending section and the waist groove section processing of the I-shaped part through one-time stamping on a punch; after the blanking and bending, shaping the I-shaped part as a whole; after the shaping, positioning the bending section and the waist groove section of the I-shaped part, pressing the undeformed section, and milling the muscle-shaped structure; after the milling is completed, the waist muscle lock piece is obtained. The application adjusts the product processing route, installs a set of quick-release tooling on the machining center, completes the shape and size processing of the functional part of the product through blanking, bending and milling, and achieves the purpose of accurate positioning and no deviation. The positioning reference of the application is accurate, the operation method is quick, the application is wide, the reliability is high, the application is easy to implement, and the application can be popularized and applied to compact structure, small size and high shape precision machining, can ensure the use reliability of the product, and meet the high size precision and high shape precision requirements of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lock plate processing, in particular to a waist rib lock plate processing method. BACKGROUND

[0002] Lock plates are widely used in fastening connectors of aero-engines due to their short manufacturing cycle and low manufacturing cost. Figure 1 As shown in a waist rib lock plate, which is used for the connection between a certain type of engine case and blade, plays a role in connection, guidance and positioning, the overall shape of the lock plate is in the shape of an I-beam, one end of which is bent upward to form a curved section, and the other end is a horizontal undeformed section, the curved section and the undeformed section are connected by an intermediate section, which is also horizontally arranged and has a waist groove obtained by extrusion sinking, the waist groove is arranged along the length direction of the lock plate, and each of the two elongated rib-shaped structures (i.e. the elongated part between the inner side of the waist groove and the outer side of the intermediate section) is symmetrically arranged along the symmetry line of the length direction of the lock plate, and the outer side of each rib-shaped structure is smoothly transitioned, when the lock plate is used, the curved part is positioned on the end face of the mounting surface, and the waist groove is positioned in the corresponding mortise to play a role in connection, guidance and positioning, and the high-precision rib-shaped structure can also play a certain shock-absorbing role during the operation of the equipment, which is crucial to the safe operation of the equipment. Therefore, it is very important to ensure high dimensional accuracy and high profile accuracy of the product during processing.

[0003] Common lock plates are generally divided into two static functions of adjusting gap and safety, and these common lock plates are usually formed by sheet stamping and bending during processing to improve processing efficiency, but due to the Figure 1 The waist rib lock plate shown in the figure has a dynamic use function, and when the existing processing method is used to process the waist rib lock plate shown in the figure, there are disadvantages of large dimensional tolerance, inaccurate forming, and low profile contour accuracy, which makes it difficult to ensure the use reliability of the processed waist rib lock plate and meet the requirements of high dimensional accuracy and high profile accuracy of the product. Figure 1 SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide a waist rib lock plate processing method which can ensure the use reliability of the product and meet the requirements of high dimensional accuracy and high profile accuracy of the product.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] A waist rib lock plate processing method, comprising the following steps:

[0007] (1) blanking the blank into an I-beam part, and when blanking the blank into an I-beam, the total length tolerance is strictly controlled to 0.1 mm to ensure the positioning accuracy in the subsequent process.

[0008] ​(2) The bending section and the waist groove section of the I-shaped part are processed by one stamping on the punch press; the consistency of the bending hook and the waist groove positioning reference is ensured under the premise of ensuring the size, thereby providing a unified positioning reference for the subsequent process.

[0009] (3) After the punching and bending, the I-shaped part is shaped as a whole; the shaping ensures the consistency of the product surface state, thereby providing a basis for the subsequent process.

[0010] (4) After the shaping, the bending section and the waist groove section of the I-shaped part are positioned, the undeformed section is pressed, and the rib-shaped structure is milled.

[0011] (5) After the milling is completed, the waist-rib lock piece is obtained.

[0012] Further, before the processing of the bending section and the waist groove section of the I-shaped part, the I-shaped part is placed on the bending and groove pressing tooling, and then the bending section and the waist groove section are processed by one stamping forming on the punch press; the bending and groove pressing tooling comprises a lower die installed on the workbench of the punch press and an upper die installed on the punch head of the punch press, a die cavity is arranged at the top of the lower die, a displacement groove for waist groove forming is arranged at the inner bottom of the die cavity, the upper die is located directly above the die cavity, a protrusion for waist groove stamping forming is arranged at the bottom of the upper die, and the protrusion is located directly above the displacement groove; during processing, the I-shaped part is placed in the die cavity, the upper die is pressed downward to press the I-shaped part into the die cavity, and one-stamping forming of the bending section and the waist groove section is realized.

[0013] Further, a top plate and a top rod are arranged in the die cavity; the top plate is arranged in the die cavity and can slide upward, and is used for ejecting the processed I-shaped part out of the die cavity, and the displacement groove is arranged at the top of the top plate; the top rod is vertically installed on the workbench of the punch press and extends into the die cavity through the workbench, and the upper end of the top rod can push the top plate upward along the die cavity.

[0014] Further, before the milling of the rib-shaped structure of the I-shaped part, the bending section and the waist groove section of the I-shaped part are positioned by using a rapid positioning and clamping tooling, the undeformed section of the I-shaped part is pressed, and then the milling of the rib-shaped structure is performed; the rapid positioning and clamping tooling comprises a longitudinal positioning member and a transverse positioning member.

[0015] The longitudinal positioning member comprises a positioning seat one, a positioning table one, a sliding block one, a sliding plate and a pressing bolt one; the positioning seat one is longitudinally installed on the machine tool operating table, an accommodating space is arranged inside the positioning seat one, and a strip-shaped hole communicating with the accommodating space is arranged on the top of the positioning seat one; the positioning table one is fixed on the top of the front end of the positioning seat one, a positioning groove one for positioning the curved section of the I-shaped part is arranged on the top right side of the positioning table one, the positioning groove one is longitudinally arranged and penetrates through the rear side of the positioning table one, and the front-to-rear length of the positioning groove one is smaller than the width of the curved section of the I-shaped part; the sliding block one is slidingly arranged on the top rear side of the positioning seat one and can slide towards the positioning groove one, and the top of the sliding block one is flush with the top of the positioning table one; the sliding plate is arranged in the accommodating space and can longitudinally slide in the accommodating space; the rod of the pressing bolt one penetrates through the sliding block one downwards and extends into the accommodating space from the strip-shaped hole to be threadedly connected with the sliding plate.

[0016] The transverse positioning member comprises a positioning seat two, a positioning table two, a sliding block two and a pressing bolt two; the positioning seat two is transversely installed on the machine tool operating table and located on the left side of the positioning table one; the positioning table two is transversely fixed on the top of the positioning seat two, the right end of the positioning table two is extended to the top of the positioning table one and located on the left side of the positioning groove one, a positioning groove two for positioning the undeformed section of the I-shaped part is arranged in the middle of the positioning table two (the depth of the positioning groove two is consistent with the thickness of the undeformed section), the platform on the right side of the positioning table two (for supporting the waist groove section of the middle of the I-shaped part) is flush with the groove bottom of the positioning groove two, and the right side groove wall of the positioning groove two is disconnected and connected with the platform on the right side of the positioning groove two; the sliding block two is slidingly installed on the positioning table two and can slide towards the positioning groove two, and a waist-shaped hole is transversely arranged on the sliding block; the screw rod of the pressing bolt two penetrates through the waist-shaped hole and is threadedly connected in the pre-set threaded hole on the positioning table two.

[0017] Further, the steps for positioning the I-shaped part by using the quick positioning and clamping tool are as follows:

[0018] The curved section of the I-shaped part is aligned downwards to the positioning groove one and clamped in the positioning groove one, the undeformed section (end part) of the I-shaped part is clamped in the positioning groove two, and the waist groove section of the I-shaped part is supported on the platform of the positioning table two between the positioning groove one and the positioning groove two; the sliding block one is pushed forward, so that the front side of the sliding block one tightly abuts against the side surface of the curved section of the I-shaped part, and then the pressing bolt one is tightened; the sliding block one is pushed rightwards, so that the right side of the sliding block two presses on the undeformed section of the I-shaped part; then the pressing bolt two is tightened to press the undeformed section of the I-shaped part; and the milling machining of the rib-shaped structure can be performed.

[0019] Further, in order to facilitate the sliding of the sliding plate and provide a guide for the sliding of the sliding plate, a guide groove communicating with the accommodating space is longitudinally arranged on each of the left and right sides of the positioning seat one; and the two ends of the sliding plate are slidingly arranged in the guide grooves.

[0020] Further, the positioning table two is provided with an emptying groove on the front and back sides of the right area of the positioning groove two, so as to facilitate the milling of the rib structure by the cutter.

[0021] Further, the rear end of the positioning table two extends beyond the rear end of the positioning table one, and the bottom surface of the positioning table two is in contact with the top of the positioning table one.

[0022] Further, when the rib structure of the I-shaped part is milled, the rib structure is milled at least twice, the spindle speed of the machine tool is 800-1000 rpm, and the feed rate is 300 mm / min.

[0023] The application can realize the processing of the waist rib lock piece with high appearance requirements, and solve the problems of waist rib deviation, inaccurate size positioning, and high-precision rib shape not meeting the design requirements in the product manufacturing process.

[0024] The application adjusts the product processing route, installs a quick-release tooling on the machining center, and completes the shape and size processing of the functional part of the product by blanking, bending + milling, so as to achieve accurate positioning and prevent deviation.

[0025] The application has accurate positioning reference, fast operation method, wide application, high reliability, easy implementation, and can be applied to compact structure, small size, and high-precision appearance processing, so as to ensure the reliability of the product, and meet the requirements of high size precision and high appearance precision. BRIEF DESCRIPTION OF DRAWINGS

[0026] The application will be further described in detail below with reference to the drawings.

[0027] Figure 1 It is a structure diagram of the waist rib lock piece of the application;

[0028] Figure 2 It is a structure diagram of the bending and grooving tooling of the application;

[0029] Figure 3 It is a structure diagram of the quick positioning and clamping tooling of the application;

[0030] Figure 4 It is a structure diagram of the longitudinal positioning member in the quick positioning and clamping tooling of the application;

[0031] Figure 5 It is a structure diagram of the transverse positioning member in the quick positioning and clamping tooling of the application;

[0032] As shown in the figure: 1-punch press workbench, 2-locking bolt one, 3-lower die, 4-upper die, 5-locking bolt two, 6-punch press punch, 7-top plate, 8-positioning pin, 9-top rod, 10-cavity, 11-I-shaped part, 12-positioning seat one, 13-positioning table one, 14-sliding block one, 15-sliding plate, 16-pressing bolt one, 17-strip-shaped hole, 18-guide groove, 19-positioning groove one, 20-positioning seat two, 21-positioning table two, 22-sliding block two, 23-locking bolt two, 24-waist-shaped hole, 25-positioning groove two, 26-clearance groove. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. Embodiment 1

[0034] The embodiment provides a processing method of waist muscle locking piece, comprising the following steps:

[0035] Step one: according to the product structure, select high-temperature alloy sheet, according to the actual use condition and product characteristics of the product, determine that the waist muscle locking piece adopts stamping and milling processing method.

[0036] Step two: blank (high-temperature alloy sheet) is punched into I-shaped part, when the blank is punched into I-shaped part, in order to ensure the positioning accuracy of the later process, the total length tolerance is strictly controlled to 0.1mm;

[0037] Step three: the bending section and the waist groove section of the I-shaped part are processed by one-time stamping on the punch press; under the premise of ensuring the size, the consistency of the bending hook and the waist groove positioning reference is also ensured, which provides a unified positioning reference for the later process. Specifically: before processing the bending section and the waist groove section of the I-shaped part, the I-shaped part is placed on the bending and pressing groove tooling, and then the bending section and the waist groove section are processed by one-time stamping forming; for example Figure 2As shown, the bending and groove forming tooling includes a lower die 3 and an upper die 4; the lower die 3 is locked on the punch bed 1 by at least one locking bolt 2 and is positioned on the punch bed 1 by at least one positioning pin 8, a die cavity 10 is provided on the top of the lower die 3, and a clearance groove (located directly below the waist groove, which provides clearance for the forming of the waist groove and can temporarily store the waste material cut off from the middle part of the waist groove) is provided on the inner bottom of the die cavity 10. The upper die 4 is axially installed on the punch 6 of the punch bed and is locked on the punch 6 of the punch bed by locking bolt 5, the upper die 4 is located directly above the die cavity 10, and a protrusion for forming the waist groove is provided on the bottom of the upper die 4, which is located directly above the clearance groove, and the two cooperate to achieve the punching forming of the waist groove; during processing, the I-shaped part 11 is placed in the die cavity 10, and the upper die 4 is pressed down to press the I-shaped part 11 into the die cavity 10, thereby achieving one-time punching forming of the bending section and the waist groove section.

[0038] Step four: after punching and bending, the I-shaped part 11 is shaped as a whole; shaping ensures that the surface state of the product is consistent, providing a basis for subsequent processing.

[0039] Step five: after shaping, the bending section and the waist groove section of the I-shaped part 11 are positioned by using a quick positioning clamping tooling, the undeformed section of the I-shaped part 11 is pressed tightly, and the rib structure is milled; when the rib structure of the I-shaped part 10 is milled, the rib structure is milled at least twice, the spindle speed of the machine tool is 800-1000 rpm, and the feed rate is 300 mm / min.

[0040] As shown in Figures 3-5 the quick positioning clamping tooling includes a longitudinal positioning member and a transverse positioning member.

[0041] As shown in Figure 4As shown, the longitudinal positioner comprises a position base 12, a position table 13, a sliding block 14, a sliding plate 15 and a pressing bolt 16; the position base 12 is longitudinally installed on the machine tool operating table, and a containing space is arranged inside the position base 12, and a strip-shaped hole 17 communicating with the containing space is longitudinally arranged on the top of the position base 12; the position table 13 is fixed on the top of the front end of the position base 12 (the position base 12 and the position table 13 are an integral structure), and a position groove 19 for positioning the bent section of the I-shaped part 11 is arranged on the top right side of the position table 13, the position groove 19 is longitudinally arranged and its back side penetrates through the back side of the position table 13, and the front-to-back length (longitudinal length) of the position groove 19 is smaller than the width of the bent section of the I-shaped part 11; the sliding block 14 is slidingly arranged on the top back side of the position base 12 and can slide on the position base 12 towards the position groove 19, and the top of the sliding block 14 is flush with the top of the position table 13; the sliding plate 15 is arranged in the containing space and can longitudinally slide in the containing space, in order to facilitate the sliding of the sliding plate 15 and provide guidance for the sliding of the sliding plate 15, a guide groove 18 communicating with the containing space is longitudinally arranged on the left and right sides of the position base 12 respectively, and the two ends of the sliding plate 15 are slidingly arranged in the guide grooves 18; the rod of the pressing bolt 16 penetrates through the sliding block 14 downwards and extends into the containing space from the strip-shaped hole 17 to be threadedly connected with the sliding plate 15.

[0042] As Figure 5As shown, the transverse positioning member comprises positioning seat two 20, positioning table two 21, sliding block two 22 and compression bolt two 23; the positioning seat two 20 is transversely mounted on the machine tool operating table and located at the left side of the positioning table one 13; the positioning table two 21 is transversely fixed on the top of the positioning seat two 20 (the positioning table two 21 and the positioning seat two 20 are integrated structure), the right end of the positioning table two 21 is extended to the right (protruding from the right side of the positioning seat two 20) to the top of the positioning table one 13 and located at the left side of the positioning groove one 19, the middle part of the positioning table two 21 is provided with a positioning groove two 25 (the depth of the positioning groove two 25 is consistent with the thickness of the undeformed section) for positioning the undeformed section of the I-shaped part 11, the platform (for supporting the waist groove section of the positioning I-shaped part 11) of the positioning table two 21 located at the right side of the positioning groove two 25 is flush with the groove bottom of the positioning groove two 25, at the same time, the right side groove wall of the positioning groove two 25 is disconnected and connected (aligned) with the platform at the right side of the positioning groove two 25; the sliding block two 22 is slidingly mounted on the positioning table two 21 and can slide towards the direction of the positioning groove two 25 (until covering the upper part of the positioning groove two 25), the waist-shaped hole 24 is transversely provided on the sliding block 22, the length of the waist-shaped hole 24 is greater than the diameter of the screw rod of the compression bolt two 23, the waist-shaped hole 24 is used for providing guidance for the sliding of the sliding block 22 and limiting the sliding distance of the sliding block 22; the screw rod of the compression bolt two 23 is threadedly connected in the pre-set threaded hole of the positioning table two 21 after penetrating through the waist-shaped hole 24.

[0043] The steps of positioning the I-shaped part by using the rapid positioning and clamping tool are as follows:

[0044] (1) The bent section of the I-shaped part 11 is aligned with and clamped in the positioning groove one 19 downward, the undeformed section (end part) of the I-shaped part 11 is clamped in the positioning groove two 25, and the waist groove section of the I-shaped part is supported on the platform of the positioning table two 25 between the positioning groove one 19 and the positioning groove two 25.

[0045] (2) The sliding block one 14 is pushed forward, the front side of the sliding block one 14 abuts against the side surface of the bent section of the I-shaped part 11, and then the compression bolt one 16 is tightened.

[0046] (3) The sliding block two 22 is pushed to the right, the right side of the sliding block two 22 is pressed on the undeformed section of the I-shaped part 11, then the compression bolt two 23 is tightened, the right end of the sliding block two 22 is pressed on the undeformed section of the I-shaped part 11; the milling machining of the rib structure can be performed.

[0047] Step six: after the milling machining is completed, the waist rib lock piece of the finished product is obtained. Example 2

[0048] The difference between this example and example 1 is:

[0049] In order to take out the I-shaped part 11 after completing the one-time stamping forming of the bending section and the waist groove section of the I-shaped part 11. As shown in the embodiment, a top plate 7 and a top rod 9 are arranged in the mold cavity 10; the top plate 7 is arranged in the mold cavity 10 and can slide upward, and is used for ejecting the processed I-shaped part 11 out of the mold cavity 10. After the top plate 7 is arranged, the corresponding gap needs to be arranged on the top of the top plate 7; the top rod 9 is vertically installed on the punch bench 1 and extends into the mold cavity 10 through the punch bench 1, and the upper end of the top rod 9 can push the top plate 7 upward along the mold cavity 10, and then the processed I-shaped part 11 is ejected out of the mold cavity. Figure 2 Embodiment 3

[0050] The difference between the embodiment and the embodiment 1 is that:

[0051] As shown in the embodiment, the rear end of the positioning table two 21 extends out of the rear end of the positioning table one 13, and the bottom surface of the positioning table two 21 is in contact with the top of the positioning table one 13. When the sliding block one 14 is tightly pressed against the bending section, the top of the sliding block one 14 is in contact with the bottom surface of the positioning table two 21, and the extension section of the rear end of the positioning table two 21 can limit the sliding block one 14 in the vertical direction. Figure 3

[0052] The other details of the present application are well known to those skilled in the art.

[0053] It should be noted that the terms “include”, “contain” or any other variant are intended to cover non-exclusive inclusion, so that the process, method, article or equipment containing a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment.

[0054] The protection scope of the present application is not limited to the technical solutions disclosed in the specific embodiments. Any modification, equivalent replacement, improvement, etc. made according to the technical essence of the present application to the above embodiments falls within the protection scope of the present application.​​

Claims

1. A method of processing a lumbar muscle lock plate, characterized by, It comprises the following steps: punching a blank into a I-shaped part; processing the bending section and the waist groove section of the I-shaped part by one stamping on a punch press; after punching and bending, shaping the whole I-shaped part; after shaping, positioning the bending section and the waist groove section of the I-shaped part by using a rapid positioning and clamping tooling before milling the rib structure of the I-shaped part, and then performing milling of the rib structure after pressing the undeformed section; the rapid positioning and clamping tooling comprises a longitudinal positioning member and a transverse positioning member; the longitudinal positioning member comprises a positioning seat one, a positioning table one, a sliding block one, a sliding plate and a pressing bolt one; the positioning seat one is longitudinally installed on the machine tool operating table, and an accommodating space is arranged inside the positioning seat one; a strip-shaped hole is longitudinally arranged on the top of the positioning seat one and communicates with the accommodating space; the positioning table one is fixed on the top of the front end of the positioning seat one; a positioning groove one for positioning the bending section of the I-shaped part is arranged on the top right side of the positioning table one; the positioning groove one is longitudinally arranged and penetrates through the back side of the positioning table one from the back side; the length of the positioning groove one from front to back is less than the width of the bending section of the I-shaped part; the sliding block one is slidingly arranged on the top back side of the positioning seat one and can slide towards the positioning groove one; the top of the sliding block one is flush with the top of the positioning table one; the sliding plate is arranged in the accommodating space and can slide longitudinally in the accommodating space; the rod of the pressing bolt one penetrates through the sliding block one downward and extends into the accommodating space from the strip-shaped hole to be threadedly connected with the sliding plate; the transverse positioning member comprises a positioning seat two, a positioning table two, a sliding block two and a pressing bolt two; the positioning seat two is transversely installed on the machine tool operating table and is located on the left side of the positioning table one; the positioning table two is transversely fixed on the top of the positioning seat two; the right end of the positioning table two is extended to the top of the positioning table one and is located on the left side of the positioning groove one; a positioning groove two for positioning the undeformed section of the I-shaped part is arranged in the middle of the positioning table two; the platform on the right side of the positioning table two is flush with the groove bottom of the positioning groove two, and the groove wall on the right side of the positioning groove two is disconnected and connected with the platform on the right side of the positioning groove two; the sliding block two is slidingly installed on the positioning table two and can slide towards the positioning groove two; a waist-shaped hole is transversely arranged on the sliding block two; the screw rod of the pressing bolt two penetrates through the waist-shaped hole and is threadedly connected in the pre-set threaded hole on the positioning table two; after the milling is completed, the waist-rib lock piece is obtained.

2. The method of claim 1, wherein: Before processing the bending section and the waist groove section of the I-shaped part, the I-shaped part is placed on the bending and pressing groove tooling, and then the bending section and the waist groove section are processed by one-time stamping forming by using a punch press; the bending and pressing groove tooling comprises a lower die installed on the working table of the punch press and an upper die installed on the punch head of the punch press; a die cavity is arranged on the top of the lower die; a clearance groove for waist groove forming is arranged on the inner side bottom of the die cavity; the upper die is located directly above the die cavity; a protrusion for waist groove stamping forming is arranged on the bottom of the upper die and is located directly above the clearance groove; during processing, the I-shaped part is placed in the die cavity; the upper die is pressed downward to press the I-shaped part into the die cavity, so that the bending section and the waist groove section are one-time stamping formed.

3. The method of claim 2, wherein: a top plate and a top rod are arranged in the die cavity; The top plate is arranged in the mold cavity and can slide upward; the letting slot is arranged on the top of the top plate; the top rod is vertically installed on the workbench of the punch and extends into the mold cavity through the workbench, and the upper end of the top rod can push the top plate upward along the mold cavity.

4. The method of claim 1, wherein the lumbar muscle lock plate is made of a material selected from the group consisting of titanium, stainless steel, and cobalt-chrome. The steps of positioning the I-shaped part by using the fast positioning clamping tool are as follows: The bent section of the I-shaped part is aligned with and clamped in the first positioning slot, the undeformed section of the I-shaped part is clamped in the second positioning slot, and the waist groove section of the I-shaped part is supported on the area of the second positioning table between the first positioning slot and the second positioning slot; The slider one is pushed forward to tightly abut the bent section of the I-shaped part on the front side of the slider one, and then the compression screw one is tightened; The slider one is pushed right to press the undeformed section of the I-shaped part on the right side of the slider two, and then the compression screw two is tightened to compress the undeformed section of the I-shaped part; the milling of the rib structure can be performed.

5. The method of claim 1, wherein: A guide slot communicating with the accommodating space is longitudinally arranged on the left and right sides of the positioning seat one.

6. The method of claim 1, wherein: The front and rear sides of the area of the second positioning table on the right side of the second positioning slot are transversely provided with avoidance slots.

7. The method of claim 1, wherein: The rear end of the second positioning table extends beyond the rear end of the first positioning table, and the bottom surface of the second positioning table is in contact with the top of the first positioning table.

8. The method of claim 1-7, wherein: When the rib structure of the I-shaped part is milled, the rib structure is at least processed by 2 times of fine milling, the spindle speed of the machine tool is 800-1000 rpm, and the feed rate is 300 mm / min.

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