A milling die and milling method for aircraft aluminum alloy slot frame parts

Abstract

The present application discloses a milling die and a milling method for aluminum alloy slotted frame parts of aircraft, wherein the die includes a fixed die and a clamping assembly. The fixed die is provided with a fixed groove consistent with the shape of the part; the clamping assembly includes a base, a movable slider, a transverse fixing plate, and a longitudinal fixing plate. By utilizing the basic principles of stamping processing and mechanical transmission, a "T"-shaped structure is used to realize the application of pressure in three directions; the T-shaped slide groove and the transverse / longitudinal fixing plate are designed as a trapezoidal cross section to realize the fixation of the transverse / longitudinal fixing plate; the self-locking clamping bolt is used to transmit force and the direction of the force is in the same plane as the sliding direction of the transverse / longitudinal fixing plate, so as to realize the compact design of the milling die and ensure that the parts are milled smoothly and uninterruptedly; the primary / secondary force transmission surface is in contact and set to 45° to realize the simultaneity of the pressure of the transverse / longitudinal fixing plate on the part; the coordination of the tension / compression spring is used to realize the consistency of the pressure of the transverse / longitudinal fixing plate on the part and the convenience of automatic return of the transverse / longitudinal fixing plate.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft parts manufacturing, in particular to a milling die and a milling method for aircraft aluminum alloy slotted frame parts. Background Art

[0002] Large aluminum alloy slot frame parts for aircraft refer to sheet metal parts for aircraft door frames with an overall shape of "U" and a cross section of "U", which are mainly used for the fixation and installation of aircraft cabin doors. When assembling such parts, they are connected by riveting the upper and lower halves, which requires high forming accuracy and milling accuracy of the upper and lower parts, especially the opening and surrounding accuracy. my country's aviation manufacturing industry basically uses the processing method of plastic deformation of aluminum alloy at room temperature for the processing of large aluminum alloy slot frame parts for aircraft. At present, large aluminum alloy slot frame parts adopt a three-step forming method: the first step is deep drawing; the second step is part shaping; the third step is part edge milling. After such parts are formed by deep drawing, a blank holder will appear at the edge and opening of the part due to the deep drawing process, and irregular defects such as wrinkles and cracks will appear on the blank holder. After the part is shaped, the defects on the blank holder will continue to increase with the degree of shaping, which increases the difficulty of subsequent part edge milling. Traditionally, such parts are milled by clamping them to the die, and at least three clamps are required for clamping. Moreover, due to the structure of the clamp itself, it will block the tool progress when clamping. The tool needs to avoid the clamp, which will cause the blank holder to remain. In subsequent reprocessing, the error after two milling cuts will cause step difference on the edge of the part, which is prone to part defects and low manufacturing efficiency. Therefore, it is necessary to consider a method with a simple operation structure and can effectively reduce the scrap rate to solve the milling of large aluminum alloy slot frame parts for aircraft. Summary of the invention

[0003] The purpose of the present application is to provide a milling die and a milling method for aircraft aluminum alloy slot frame parts, which can be applicable to the design and manufacture of milling dies for various aluminum alloy slot frame parts.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] A milling die for aircraft aluminum alloy slot-shaped frame parts, including a fixed die and a clamping assembly. The fixed die is provided with a fixed groove consistent with the shape of the part. The clamping assembly includes a base, a movable slide, a transverse fixing plate, a longitudinal fixing plate, and a self-locking clamping bolt. The base is a T-block structure, on which a T-shaped slide is provided. The cross section of the T-shaped slide is trapezoidal. The T-shaped slide is composed of a transverse slide and a longitudinal slide that are perpendicular to each other. Three limit pin holes are provided at the three outlet ends of the T-shaped slide, and a bolt hole connected to the movable slide is provided in the middle. The self-locking clamping bolt is installed in the clamping hole in the middle of the top surface of the base. The movable slide is a Y-shaped structure, and a feed long circular groove is provided in the middle. The movable slide is installed at the intersection of the transverse slide and the longitudinal slide, and its top end surface Connected with the self-locking clamping bolts, the movable slider can move up and down along the longitudinal slide groove and is limited and fixed by bolts passing through the feed oblong groove. Both sides of the head of the movable slider are main force transmission surfaces inclined at 45°. The transverse fixed plate includes a set of symmetrical left fixed plates and right fixed plates. One end of the left and right fixed plates is a secondary force transmission surface inclined at 45°. The left and right fixed plates are installed in the transverse slide grooves on the left and right sides of the movable slider. The secondary force transmission surface at one end fits the main force transmission surface of the movable slider, and the other end fits the part surface. The left and right fixed plates are connected together by a tension spring in the middle. The longitudinal fixed plate is installed in the longitudinal slide groove, one end is connected to the bottom end surface of the movable slider through a compression spring, and the other end fits the part surface. A limiting groove is provided in the middle of the longitudinal fixed plate.

[0006] Furthermore, the roughness of the main force transmission surface and the secondary force transmission surface is 0.8, and the surface is graphite inlaid to ensure wear resistance.

[0007] Furthermore, the cross-sections of the transverse fixing plate and the longitudinal fixing plate are trapezoidal.

[0008] The method for forming using the milling die comprises the following steps:

[0009] 1 Place the part with the pressure ring into the fixed die, and the outer surface of the part fits into the fixed groove of the fixed die.

[0010] 2 After assembling the clamping assembly, put it into the fixed groove 5 of the fixed die. The contact surface end of the longitudinal fixed plate part fits the part, and the compression spring is in a relaxed state. Rotate the self-locking clamping bolt. At this time, the tension spring in the transverse fixed plate is in a tightened state. The main force transmission surface on the movable slider is always in contact with the secondary force transmission surface on the transverse fixed plate. The self-locking clamping bolt pushes the movable slider to move downward longitudinally, and the transverse fixed plate moves outward and left and right in the transverse direction, and the tension spring is stretched;

[0011] 3 As the movable slider moves longitudinally, the compression spring begins to compress, and the longitudinal fixed plate is compressed by the compression spring, continuously pressing the parts. Until the contact surface of the transverse fixed plate and the parts are in contact and pressed. At this time, the parts are fixed in the fixed groove under pressure from three directions.

[0012] 4 After the parts are milled, the self-locking clamping bolts are loosened. At this time, the movable slider moves upward, the tension spring is tightened, the main force transmission surface on the movable slider is always in contact with the secondary force transmission surface on the transverse fixed plate, and the transverse fixed plate moves inward along the transverse direction under the force of the tension spring, and the part contact surface leaves the part surface. The compression spring is relaxed, and the pressure of the longitudinal fixed plate on the part is reduced until the clamping assembly is separated from the fixed die and the part is taken out.

[0013] The beneficial effects of this application are as follows: utilizing the basic principles of stamping and mechanical transmission, and utilizing a "T"-shaped structure to achieve the application of pressure in three directions; utilizing a T-shaped slideway and a horizontal / vertical fixing plate cross-section designed as a trapezoid to achieve the fixation of the horizontal / vertical fixing plate; utilizing a self-locking clamping bolt to transmit force and the direction of the force being in the same plane as the sliding direction of the horizontal / vertical fixing plate, to achieve a compact milling die design and ensure smooth and uninterrupted milling of parts; utilizing the primary / secondary force transmission surface contact and setting it at 45° to achieve the simultaneity of the horizontal / vertical fixing plate's pressure on the part; utilizing the coordination of the tension / compression springs to achieve the consistency of the horizontal / vertical fixing plate's pressure on the part and the convenience of the automatic return of the horizontal / vertical fixing plate. This application achieves low-cost, high-efficiency, and precise milling of large aluminum alloy slot-shaped frame parts for aircraft, and is generally applicable to large aluminum alloy slot-shaped frame parts for aircraft.

[0014] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Parts structure drawing;

[0016] Figure 2 Aluminum alloy slot frame parts milling die appearance structure diagram;

[0017] Figure 3 Base structure diagram;

[0018] Figure 4 Partial structural diagram of the clamping assembly;

[0019] Figure 5 Partial structural diagram of the clamping assembly;

[0020] Explanation of the numbers in the figure: 1. Parts before milling; 2. Parts after milling; 3. Fixed die; 4. Clamping assembly; 5. Fixed groove; 6. Base; 7. Moving slide block; 8. Horizontal fixing plate; 9. Longitudinal fixing plate; 10. T-shaped slide; 11. Self-locking clamping bolt; 12. Horizontal slide; 13. Longitudinal slide; 14. Feeding long round groove; 15. Main force transmission surface; 16. Secondary force transmission surface; 17. Extension spring; 18. Compression spring; DETAILED DESCRIPTION

[0021] Figure 1This is a schematic diagram of part 1 before milling and part 2 after milling of an aluminum alloy slot frame part.

[0022] Figure 2 to Figure 5 A milling die for aircraft aluminum alloy slot-shaped frame parts, including a fixed die 3 and a clamping assembly 4, the fixed die 3 is provided with a fixed groove 5 consistent with the shape of the part, the clamping assembly 4 includes a base 6, a movable slider 7, a transverse fixing plate 8, a longitudinal fixing plate 9, and a self-locking clamping bolt 11. The base is a T-block structure, on which a T-shaped slide 11 is provided. The cross section of the T-shaped slide 11 is trapezoidal. The T-shaped slide 11 is composed of a transverse slide 12 and a longitudinal slide 13 that are perpendicular to each other. Three limit pin holes are provided at three outlet ends in the T-shaped slide 11, and a bolt hole connected to the movable slider 7 is provided in the middle. The self-locking clamping bolt 11 is installed in the clamping hole in the middle of the top surface of the base 6. The movable slider 7 is a Y-shaped structure, and a feed long circular groove 14 is provided in the middle. The movable slider 7 is installed at the intersection of the transverse slide 12 and the longitudinal slide 13. The end surface of the movable slider 7 is connected with the self-locking clamping bolt 11, the movable slider 7 can move up and down along the longitudinal slide groove 13, and is limited and fixed by the bolts passing through the feed oblong groove 14. Both sides of the head of the movable slider 7 are main force transmission surfaces 15 inclined at 45°, and the transverse fixed plate 8 comprises a group of symmetrical left fixed plates and right fixed plates, and one end of the left and right fixed plates is a secondary force transmission surface 16 inclined at 45°. The left and right fixed plates are installed in the transverse slide grooves 12 on the left and right sides of the movable slider 7, and the secondary force transmission surface 16 at one end is in contact with the main force transmission surface 15 of the movable slider 7, and the other end is in contact with the part surface. The left and right fixed plates are connected together by a tension spring 17 in the middle. The longitudinal fixed plate 9 is installed in the longitudinal slide groove 13, one end is connected to the bottom end surface of the movable slider 7 by a compression spring 18, and the other end is in contact with the part surface. A limiting groove is provided in the middle of the longitudinal fixed plate 9.

[0023] The roughness of the main force transmission surface 15 and the secondary force transmission surface 16 are both 0.8, and graphite inlay treatment can be performed on their surfaces to ensure wear resistance.

[0024] The cross-sections of the transverse fixing plate 8 and the longitudinal fixing plate 9 are trapezoidal.

[0025] The method for forming using the milling die comprises the following steps:

[0026] 1Put the part 1 with the blank holder into the fixed die 3, and the outer surface of the part fits with the fixed groove 5 of the fixed die 3.

[0027] 2 After the clamping assembly 4 is assembled, it is placed in the range of the fixed groove 5 in the fixed die 3. The part contact surface end of the longitudinal fixing plate 9 is in contact with the part, and the compression spring 18 is in a relaxed state. The self-locking clamping bolt 11 is rotated, and the tension spring 17 in the transverse fixing plate 8 is in a tightened state. The main force transmission surface 15 on the movable slider 7 is always in contact with the secondary force transmission surface 16 on the transverse fixing plate 8. The self-locking clamping bolt 11 pushes the movable slider 7 to move downward longitudinally, and the transverse fixing plate 8 moves outward and left and right in the transverse direction, and the tension spring 17 is stretched;

[0028] As the movable slider 7 moves longitudinally, the compression spring 18 begins to compress, and the longitudinal fixing plate 9 is subjected to the compression force of the compression spring 18, and continuously presses the parts. Until the part contact surface of the transverse fixing plate 8 contacts and presses the parts. At this time, the parts are fixed in the fixing groove 5 under pressure from three directions.

[0029] After the part is milled, the self-locking clamping bolt 11 is loosened. At this time, the movable slide block 7 moves upward, the tension spring 17 is tightened, the main force transmission surface 15 on the movable slide block 7 is always in contact with the secondary force transmission surface 16 on the transverse fixing plate 8, and the transverse fixing plate 8 moves inward in the transverse direction under the force of the tension spring 17, and the part contact surface leaves the part surface. The compression spring 18 is relaxed, and the pressure of the longitudinal fixing plate 9 on the part is reduced until the clamping assembly 4 is separated from the fixed die 3 and the part is taken out.

Claims

1. A milling die for aircraft aluminum alloy slot frame parts, characterized in that It includes a fixed die and a clamping assembly. The fixed die is provided with a fixed groove consistent with the shape of the part. The clamping assembly contains a base, a movable slider, a transverse fixing plate, a longitudinal fixing plate, and a self-locking clamping bolt. The base is a T-block structure, on which a T-shaped slide is provided. The cross section of the T-shaped slide is trapezoidal. The T-shaped slide is composed of a transverse slide and a longitudinal slide that are perpendicular to each other. Three limit pin holes are provided at the three outlet ends of the T-shaped slide, and a bolt hole connected to the movable slider is provided in the middle. The self-locking clamping bolt is installed in the clamping hole in the middle of the top surface of the base. The movable slider is a Y-shaped structure, and a feed long circular groove is provided in the middle. The movable slider is installed at the intersection of the transverse slide and the longitudinal slide, and its top end face is connected to the self-locking clamping bolt The movable slider can move up and down along the longitudinal slide groove and is limited and fixed by bolts passing through the feed long circular groove. Both sides of the head of the movable slider are main force transmission surfaces inclined at 45°. The horizontal fixed plate includes a set of symmetrical left fixed plates and right fixed plates. One end of the left and right fixed plates is a secondary force transmission surface inclined at 45°. The left and right fixed plates are installed in the horizontal slide grooves on the left and right sides of the movable slider. The secondary force transmission surface at one end is in contact with the main force transmission surface of the movable slider, and the other end is in contact with the part surface. The left and right fixed plates are connected together by a tension spring in the middle. The longitudinal fixed plate is installed in the longitudinal slide groove, one end is connected to the bottom end surface of the movable slider through a compression spring, and the other end is in contact with the part surface. A limiting groove is provided in the middle of the longitudinal fixed plate.

2. The milling die for aircraft aluminum alloy slot frame parts according to claim 1, characterized in that The roughness of the main force transmission surface and the secondary force transmission surface are both 0.

8.

3. The milling die for aircraft aluminum alloy slot frame parts according to claim 1, characterized in that The cross sections of the transverse fixing plate and the longitudinal fixing plate are trapezoidal.

4. A method for milling aircraft aluminum alloy slot frame parts, characterized in that The milling die for aircraft aluminum alloy slot frame parts according to any one of claims 1 to 3 is used for milling, and the specific steps are as follows: 4-1 Place the part with blank holder into the fixed die, and the outer surface of the part fits in the fixed groove of the fixed die; 4-2 After the clamping assembly is assembled, put it into the fixed groove range of the fixed die. The contact surface end of the longitudinal fixed plate part fits with the part, the compression spring is in a relaxed state, and the self-locking clamping bolt is rotated. At this time, the tension spring in the transverse fixed plate is in a tightened state. The main force transmission surface on the movable slider is always in contact with the secondary force transmission surface on the transverse fixed plate. The self-locking clamping bolt pushes the movable slider to move downward longitudinally, and the transverse fixed plate moves outward and left and right in the transverse direction, and the tension spring is stretched; 4-3 As the movable slider moves longitudinally, the compression spring begins to compress, and the longitudinal fixed plate is compressed by the compression spring, continuously pressing the parts until the contact surface of the transverse fixed plate and the parts are in contact and pressed. At this time, the parts are fixed in the fixed groove under pressure from three directions; 4-4 After the part is milled, the self-locking clamping bolt is loosened. At this time, the movable slider moves upward, the tension spring is tightened, the main force transmission surface on the movable slider is always in contact with the secondary force transmission surface on the transverse fixed plate, and the transverse fixed plates move inward in the transverse direction under the action of the tension spring. The part contact surface leaves the part surface, the compression spring is relaxed, and the pressure of the longitudinal fixed plate on the part is reduced until the clamping assembly is separated from the fixed die and the part is taken out.

Images