Clamping device for milling double-journal blade and milling machine

Abstract

The invention discloses a clamping device for milling a double-journal blade, namely a milling machine. The clamping device comprises a base, a fixed assembly, a rotating assembly and a tensioning assembly, the base is provided with a mounting hole, and the fixing assembly and the tensioning assembly are arranged on the two axial sides of the mounting hole respectively. The two first bearings of the rotating assembly are perpendicular to the axis of the mounting hole. The first shaft section is located in the mounting hole, and the two first bearings are connected to the first shaft section in a sleeving mode; the outer diameter of the first bearing is equal to the shaft diameter of the mounting hole, and the shaft diameter of the second shaft section is smaller than that of the first shaft section; the tensioning assembly is provided with an axis, a tensioning bolt, a second bearing, an annular base plate and an annular cover plate, the second shaft section is sleeved with the second bearing, the second shaft section is sleeved with the base plate and the cover plate, and the tensioning bolt is in threaded connection with the second shaft section; the outer diameters of the base plate and the cover plate are larger than the shaft diameter of the mounting hole. According to the machining method, the double-journal blade can be prevented from deforming in the machining process, and the machining size of the double-journal blade is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of blade processing, and in particular to a clamping device and a milling machine for milling double-journal blades. Background Art

[0002] A double-journal blade is a special aero-engine blade that has two journals, a design that gives it greater stability and precision when installed and positioned. Double-journal blades are widely used in turbofan engines, especially in the design of straightening blades, because they can effectively guide airflow, reduce drag, and improve engine performance.

[0003] Due to the complex geometry and high precision requirements of the double-journal blade, the processing of the double-journal blade is very complicated, and usually a multi-coordinate, high-precision CNC milling machine is used for milling. During the processing, the double-journal blade is usually placed horizontally, one of the journals is clamped by the four-axis of the milling machine, and the other journal is clamped by the tailstock ejector of the milling machine to achieve the fixed processing shape.

[0004] However, for double-neck blades with poor rigidity, after being fixed using the four-axis milling machine and the ejector pin, the double-neck blades will undergo slight deformation in the vertical direction due to the effect of gravity, and the middle part will shift downward, causing the tool to easily deflect when processing the middle section of the blade, thereby affecting the processing size of the double-neck blade. Summary of the invention

[0005] Based on this, it is necessary to provide a clamping device and a milling machine for the milling of double-neck blades to address the above-mentioned technical problems, which can avoid deformation of the double-neck blades during the processing and ensure the processing size of the double-neck blades.

[0006] In a first aspect, the present invention provides a clamping device for milling a double-journal blade, comprising a base, a fixing assembly for fixing the double-journal blade journal, a rotating assembly, and a tensioning assembly;

[0007] The base is provided with a mounting hole penetrating the base, and the fixing assembly and the tensioning assembly are respectively arranged on both axial sides of the mounting hole;

[0008] The rotating assembly is provided with a rotating shaft, a rotating disk and two first bearings, the two first bearings are respectively fixedly assembled at two ends of the inside of the mounting hole, and the first bearings are perpendicular to the axis of the mounting hole;

[0009] The rotating shaft includes a first shaft section and a second shaft section, the first shaft section is located in the mounting hole, the two first bearings are sleeved on the first shaft section, the outer diameter of the first bearing is equal to the shaft diameter of the mounting hole, the second shaft section is arranged at one end of the first shaft section close to the tensioning assembly, the second shaft section is integrally connected with the first shaft section, and the shaft diameter of the second shaft section is smaller than the shaft diameter of the first shaft section;

[0010] The rotating disk is fixedly connected to one end of the first shaft section close to the fixed assembly, and the first shaft section is vertically fixedly connected to the center of the rotating disk;

[0011] The tensioning assembly is tightly connected in sequence along the direction from the tensioning assembly to the fixing assembly, and is provided with a tensioning bolt, a second bearing, an annular pad and an annular cover plate, the second bearing is sleeved on the second shaft section, the pad and the cover plate are sleeved on the second shaft section, and the tensioning bolt is threadedly connected to the second shaft section;

[0012] The outer diameters of the backing plate and the cover plate are both larger than the shaft diameter of the mounting hole, and the inner diameters of the backing plate and the cover plate are larger than the shaft diameter of the second shaft section and smaller than the shaft diameter of the mounting hole.

[0013] In one embodiment, the base includes a bottom plate and a support plate vertically fixed above the bottom plate, and the mounting hole is arranged on the support plate.

[0014] In one embodiment, the fixing assembly is provided with a fixing plate, two fixing bolts, a first U-shaped fixing member, a second U-shaped fixing member and a ejector pin for positioning the double-journal blade;

[0015] The fixing plate is circular, a positioning hole is arranged at the center of the fixing plate, and the ejector pin is fixedly installed in the positioning hole, and the needle tip of the ejector pin is directed toward a side away from the fixing plate and coincides with the axis of the installation hole;

[0016] The first U-shaped fixing member and the second U-shaped fixing member are both fixedly connected to the fixing disk, and the fixing disk is coaxially fixedly connected to the rotating disk;

[0017] The openings of the first U-shaped fixing member and the second U-shaped fixing member are opposite to each other, and the ejector pin is located between the openings of the first U-shaped fixing member and the second U-shaped fixing member;

[0018] Two fixing holes are provided through the ends of the first U-shaped fixing member and the second U-shaped fixing member away from the fixing plate, and the two fixing holes of the first U-shaped fixing member are respectively vertically aligned with the two fixing holes of the second U-shaped fixing member;

[0019] Every two vertically aligned fixing holes form a group, and a fixing bolt is threadedly connected in each group of fixing holes.

[0020] In one embodiment, the distance between the first U-shaped fixing member and the second U-shaped fixing member is greater than or equal to 3 mm and less than or equal to 5 mm.

[0021] In a second aspect, the present invention also provides a milling machine having a clamping device for milling double-journal blades as claimed in any one of claims 1 to 4, wherein the base of the clamping device is horizontally fixedly mounted on the milling machine worktable, and the needle tip of the ejector pin of the clamping device is directed toward the fourth axis of the milling machine.

[0022] The beneficial effects of the present invention are as follows: the fixing assembly of the present invention can fix the journal at one end of the double-neck blade, and the double-neck blade can be fixed by cooperating with the four-axis milling machine to fix the journal at the other end, and then the fixing assembly is tightened toward the tightening assembly by tightening the tightening bolt, thereby achieving the tightening of the double-neck blade, which can eliminate the slight deformation of the double-neck blade in the vertical direction caused by gravity, thereby avoiding tool deflection and ensuring the processing size of the double-neck blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the overall structure of a clamping device for milling a double-journal blade provided by an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure from another angle;

[0025] Figure 3 for Figure 2 Schematic diagram of the cross-section structure along the AA plane;

[0026] Figure 4 A schematic diagram of the assembly relationship between the rotating shaft and the rotating disk provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the structure of a base provided in an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the structure of a fixing assembly provided in an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the assembly relationship between the clamping device and the milling machine provided in an embodiment of the present invention.

[0030] Explanation of the reference numerals: 100, base; 110, mounting hole; 120, bottom plate; 130, support plate; 200, fixing assembly; 210, fixing disk; 220, first U-shaped fixing piece; 230, second U-shaped fixing piece; 240, ejector pin; 250, fixing hole; 300, rotating assembly; 310, rotating shaft; 311, first shaft section; 312, second shaft section; 320, rotating disk; 330, first bearing; 400, tightening assembly; 410, tightening bolt; 420, second bearing; 430, pad; 440, cover plate; 500, workbench; 510, fourth axis of milling machine. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] It should be noted that in the description of the present invention, “upper”, “lower”, “top”, “bottom”, orientation or position relationship is based on the attached Figure 1 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In one embodiment, Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a clamping device for milling a double-journal blade, including a base 100 , a fixing assembly 200 for fixing the journals of the double-journal blade, a rotating assembly 300 and a tensioning assembly 400 .

[0034] The base 100 is provided with a mounting hole 110 penetrating the base 100 , and the fixing assembly 200 and the tensioning assembly 400 are respectively arranged on two axial sides of the mounting hole 110 .

[0035] The rotating assembly 300 is provided with a rotating shaft 310 , a rotating disk 320 and two first bearings 330 . The two first bearings 330 are respectively fixedly assembled at two ends of the inside of the mounting hole 110 . The first bearings 330 are perpendicular to the axis of the mounting hole 110 .

[0036] like Figure 4 As shown, the rotating shaft 310 includes a first shaft section 311 and a second shaft section 312. The first shaft section 311 is located in the mounting hole 110. The two first bearings 330 are both sleeved on the first shaft section 311. The outer diameter of the first bearing 330 is equal to the shaft diameter of the mounting hole 110. The second shaft section 312 is arranged at one end of the first shaft section 311 close to the tensioning assembly 400. The second shaft section 312 is integrally connected to the first shaft section 311, and the shaft diameter of the second shaft section 312 is smaller than the shaft diameter of the first shaft section 311. The rotating disk 320 is fixedly connected to one end of the first shaft section 311 close to the fixing assembly 200, and the first shaft section 311 is vertically fixedly connected to the center of the rotating disk 320.

[0037] The inner diameter of the first bearing 330 is smaller than the inner diameter of the mounting hole 110 , so the rotating shaft 310 sleeved inside the first bearing 330 can realize rotation in the mounting hole 110 .

[0038] Specifically, the first shaft segment 311 in this embodiment can rotate along the axis of the mounting hole 110 , and the second shaft segment 312 and the rotating disk 320 connected at both ends of the first shaft segment 311 can also rotate around the axis of the mounting hole 110 .

[0039] The tensioning assembly 400 is tightly connected in sequence along the direction from the tensioning assembly 400 to the fixing assembly 200, and is provided with a tensioning bolt 410, a second bearing 420, an annular gasket 430 and an annular cover plate 440, whose axis coincides with the axis of the fixing hole 250. The second bearing 420 is sleeved on the second shaft section 312, the gasket 430 and the cover plate 440 are both sleeved on the second shaft section 312, and the tensioning bolt 410 is threadedly connected to the second shaft section 312.

[0040] Specifically, the cover plate 440 is used for shaft sealing, and the function of the gasket is to prevent the second bearing 420 from wearing the cover plate 440 during the tensioning process.

[0041] The outer diameters of the backing plate 430 and the cover plate 440 are both larger than the shaft diameter of the mounting hole 110, and the inner diameters of the backing plate 430 and the cover plate 440 are larger than the shaft diameter of the second shaft segment 312 and smaller than the shaft diameter of the mounting hole 110. If the inner diameters of the backing plate and the cover plate 440 are larger than the shaft diameter of the second shaft segment 312, the backing plate 430 and the cover plate 440 will not affect the rotation of the second shaft segment 312, and the smooth rotation of the connecting shaft can be ensured.

[0042] In this embodiment, since the second bearing 420, the pad 430 and the cover plate 440 are in close contact, when the tightening bolt 410 is tightened, the rotating shaft 310 can be axially displaced in the direction of the tightening assembly 400, thereby driving the fixed assembly 200 to be axially displaced in the direction of the tightening assembly 400, and a pulling force is formed between the fixed assembly 200 and the fourth axis 510 of the milling machine, thereby tightening the double-neck blade to be processed, avoiding or eliminating blade deformation, and thus solving the processing problem during milling of double-neck blades with poor rigidity.

[0043] In one embodiment, if Figure 5 As shown, the base 100 includes a bottom plate 120 and a support plate 130 vertically fixed above the bottom plate 120 , and the mounting hole 110 is provided on the support plate 130 .

[0044] In one embodiment, Figure 6 As shown, the fixing assembly 200 is provided with a fixing plate 210, two fixing bolts, a first U-shaped fixing member 220, a second U-shaped fixing member 230 and a ejector pin 240 for positioning the double-journal blade.

[0045] The fixing disk 210 is circular, and a positioning hole is provided at the center of the fixing disk 210 . The ejector pin 240 is fixedly installed in the positioning hole. The needle tip of the ejector pin 240 faces the side away from the fixing disk 210 and coincides with the axis of the installation hole 110 .

[0046] The function of the ejector pin 240 is to dock with the center hole on the journal of the double-journal blade to achieve accurate positioning of the double-journal blade.

[0047] In this embodiment, the first U-shaped fixing member 220 and the second U-shaped fixing member 230 are both fixedly connected to the fixing disk 210, and the fixing disk 210 is coaxially fixedly connected to the rotating disk 320; the openings of the first U-shaped fixing member 220 and the second U-shaped fixing member 230 are opposite to each other, and the ejector pin 240 is located in the middle of the openings of the first U-shaped fixing member 220 and the second U-shaped fixing member 230; two fixing holes 250 are penetrated at one end of the first U-shaped fixing member 220 and the second U-shaped fixing member 230 away from the fixing disk 210, and the two fixing holes 250 of the first U-shaped fixing member 220 are respectively vertically aligned with the two fixing holes 250 of the second U-shaped fixing member 230; every two vertically aligned fixing holes 250 form a group, and a fixing bolt is threadedly connected in each group of fixing holes 250.

[0048] Specifically, the distance between the first U-shaped fixing member 220 and the second U-shaped fixing member 230 is greater than or equal to 3 mm and less than or equal to 5 mm.

[0049] The openings of the first U-shaped fixing member 220 and the second U-shaped fixing member 230 are opposite to each other, and the space formed in the middle is used to place the journal of the double-journal blade. After the blade journal is placed, the fixing bolts can be tightened to reduce the distance between the first U-shaped fixing member 220 and the second U-shaped fixing member 230, so as to achieve the clamping and fixing of the double-journal blade.

[0050] It should be noted that the clamping device for milling double-journal blades of this embodiment is also suitable for milling other double-journal parts.

[0051] Based on the same invention, in one embodiment, a milling machine is provided, which has a clamping device for double-journal blade milling as described in any of the above embodiments. Figure 7 As shown, the base 100 of the clamping device is horizontally fixedly assembled on the milling machine workbench 500, and the needle tip direction of the ejector pin 240 of the clamping device is toward the fourth axis 510 of the milling machine.

[0052] The milling machine of this embodiment has a clamping device for milling double-neck blades, which can cooperate with the four axes to fix and tighten the double-neck blades to be processed, thereby eliminating the slight deformation of the double-neck blades in the vertical direction caused by gravity, thereby avoiding tool deflection and ensuring the processing size of the double-neck blades.

[0053] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A clamping device for double-journal blade milling, characterized in that: It comprises a base (100), a fixing assembly (200) for fixing the shaft neck of a double-shaft neck blade, a rotating assembly (300) and a tensioning assembly (400); The base (100) is provided with a mounting hole (110) penetrating the base (100), and the fixing assembly (200) and the tensioning assembly (400) are respectively arranged on two axial sides of the mounting hole (110); The rotating assembly (300) is provided with a rotating shaft (310), a rotating disk (320) and two first bearings (330), the two first bearings (330) are respectively fixedly assembled at two ends inside the mounting hole (110), and the first bearings (330) are perpendicular to the axis of the mounting hole (110); The rotating shaft (310) comprises a first shaft section (311) and a second shaft section (312); the first shaft section (311) is located in the mounting hole (110); two first bearings (330) are sleeved on the first shaft section (311); the outer diameter of the first bearing (330) is equal to the shaft diameter of the mounting hole (110); the second shaft section (312) is arranged at one end of the first shaft section (311) close to the tensioning assembly (400); the second shaft section (312) is integrally connected to the first shaft section (311); and the shaft diameter of the second shaft section (312) is smaller than the shaft diameter of the first shaft section (311); The rotating disk (320) is fixedly connected to one end of the first shaft section (311) close to the fixing assembly (200), and the first shaft section (311) is vertically fixedly connected to the center of the rotating disk (320); The tensioning assembly (400) is tightly connected in sequence along the direction from the tensioning assembly (400) to the fixing assembly (200), and is provided with a tensioning bolt (410) whose axis coincides with the axis of the fixing hole (250), a second bearing (420), an annular pad (430) and an annular cover plate (440); the second bearing (420) is sleeved on the second shaft section (312); the pad (430) and the cover plate (440) are both sleeved on the second shaft section (312); and the tensioning bolt (410) is threadedly connected to the second shaft section (312); The outer diameters of the backing plate (430) and the cover plate (440) are both larger than the axial diameter of the mounting hole (110), and the inner diameters of the backing plate (430) and the cover plate (440) are larger than the axial diameter of the second shaft section (312) and smaller than the axial diameter of the mounting hole (110).

2. The clamping device for double-journal blade milling according to claim 1, characterized in that: The base (100) comprises a bottom plate (120) and a support plate (130) vertically fixed above the bottom plate (120), and the mounting hole (110) is arranged on the support plate (130).

3. The clamping device for double-journal blade milling according to claim 2 is characterized in that: The fixing assembly (200) is provided with a fixing plate (210), two fixing bolts, a first U-shaped fixing piece (220), a second U-shaped fixing piece (230), and a ejector pin (240) for positioning the double-journal blade; The fixing disk (210) is circular, a positioning hole is provided at the center of the fixing disk (210), the ejector pin (240) is fixedly mounted in the positioning hole, and the needle tip of the ejector pin (240) is directed toward a side away from the fixing disk (210) and coincides with the axis of the mounting hole (110); The first U-shaped fixing member (220) and the second U-shaped fixing member (230) are both fixedly connected to the fixing disk (210), and the fixing disk (210) is coaxially fixedly connected to the rotating disk (320); The openings of the first U-shaped fixing member (220) and the second U-shaped fixing member (230) are opposite to each other, and the ejector pin (240) is located between the openings of the first U-shaped fixing member (220) and the second U-shaped fixing member (230); Two fixing holes (250) are provided through the ends of the first U-shaped fixing member (220) and the second U-shaped fixing member (230) away from the fixing plate (210), and the two fixing holes (250) of the first U-shaped fixing member (220) are respectively vertically aligned with the two fixing holes (250) of the second U-shaped fixing member (230); Every two vertically aligned fixing holes (250) form a group, and a fixing bolt is threadedly connected in each group of fixing holes (250).

4. The clamping device for double-journal blade milling according to claim 3 is characterized in that: The distance between the first U-shaped fixing member (220) and the second U-shaped fixing member (230) is greater than or equal to 3 mm and less than or equal to 5 mm.

5. A milling machine for milling double-journal blades, characterized in that: A clamping device for double-journal blade milling as claimed in any one of claims 1 to 4, wherein the base (100) of the clamping device is horizontally fixedly mounted on a milling machine workbench (500), and the tip of the ejector pin (240) of the clamping device is directed toward the fourth axis (510) of the milling machine.

Images