Chuck-free rotary machining device for large die forging type parts

Abstract

The utility model discloses a chuck-free rotary machining device for large die forging parts, which is characterized in that external threads are arranged on the outer circle surfaces of an inner end step and an outer end step of a mandrel, a polished rod section is arranged between the two sections of external threads, and a rod head is further arranged at the outer end of the mandrel; a step at the outer end of the mandrel is sleeved with a limiting plate and two main locking nuts, and the mandrel penetrates through a center hole of the limiting plate; the two shaft rods are perpendicular to the axis of the core shaft and located at the vertical transverse position of the core shaft, each side of the two shaft rods jointly penetrates through a side plate, the pair of side plates are correspondingly provided with upper large holes and lower small holes, eccentric shaft sleeves are sleeved with the upper large holes of the side plates, and four puller screws are further installed in the middles of the side plates. The outer ends of the two sides of each shaft rod are each provided with a gasket and a cup head screw. The utility model belongs to the technical field of clamping equipment, and solves the problems that in the prior art, no appropriate clamping equipment is provided for large die forging type die forgings, the operation is tedious, and the working efficiency is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of clamping equipment and relates to a rotary processing device for large die forging parts without a clamp. Background Art

[0002] To reduce costs and conserve raw materials, some large forgings are manufactured without a chuck. This prevents them from being directly fixed on a machine tool, requiring the use of non-standard fixtures for clamping. Existing fixtures for these large forgings are bulky and lack centering capabilities. After clamping, they must be tightened and re-centered, making clamping difficult, cumbersome, and inefficient. These fixtures require the coordinated efforts of multiple personnel.

[0003] Therefore, it is urgent to develop a new type of chuckless large die forging parts rotary processing device to achieve reliable clamping of large die forgings and facilitate machine tool processing. Utility Model Content

[0004] The purpose of the utility model is to provide a rotary processing device for large die forging parts without a chuck, which solves the problems in the prior art of lack of suitable clamping equipment for large die forgings, complicated operation and low work efficiency.

[0005] The technical solution adopted by the utility model is a rotary processing device for large die forging parts without a chuck, comprising a core shaft and two shaft rods. The outer cylindrical surface of the inner end step of the core shaft is provided with an external thread 1, and the outer cylindrical surface of the outer end step of the core shaft is provided with an external thread 2. A polished rod section is provided between the second and first external threads of the core shaft, and a rod head is provided outside the second external thread of the core shaft. A limit plate and two main locking nuts are sleeved on the outer end step of the core shaft, and the core shaft passes through the center hole of the limit plate.

[0006] The two shafts are perpendicular to the axis of the core shaft and are located in the upper and lower horizontal positions of the core shaft. Each side of the two shafts is penetrated by a side plate. A pair of side plates have large holes on the upper part and small holes on the lower part. An eccentric sleeve is installed in the upper large hole of each side plate. Four tightening screws are also installed in the middle of each side plate. A gasket and a cup head screw are installed on the outer ends of both sides of each shaft.

[0007] The utility model is characterized in that the rotary processing device for large die forging parts without a chuck is:

[0008] The limit plate is located inside the two main locking nuts, and the rod head protrudes beyond the limit plate and the two main locking nuts.

[0009] A threaded hole 1 is respectively provided on the four sides of the limiting plate, and each threaded hole 1 is equipped with an external hexagonal screw.

[0010] The eccentric sleeve is circumferentially eccentric, and the outer circle of the eccentric sleeve is provided with a short-distance positioning hole and a long-distance positioning hole.

[0011] The outer surface of the shaft is provided with multiple sections, that is, a short section is provided at the threaded sections near both ends, and a long section is provided at the middle section of the shaft, and the long section is perpendicular to the short section.

[0012] The large hole and the small hole of each side plate are respectively provided with a radial threaded hole 2, and each threaded hole 2 is equipped with a hexagon socket screw.

[0013] The beneficial effect of the utility model is that it takes the rotary processing of large die forgings (such as civil aircraft landing gear) as the main object, optimizes the clamping structure setting, can safely, quickly and accurately clamp and align, reduces the difficulty of operation, improves the clamping efficiency, and facilitates the processing of die forgings by machine tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall exploded structure of the device of the utility model;

[0015] Figure 2 This is a schematic diagram of the connection state between the device of the utility model and the die forging;

[0016] Figure 3 It is a schematic diagram of the installation state of the device of the utility model being connected to the three-jaw end face of a machine tool.

[0017] In the figure, 1. core shaft, 2. limit plate, 3. main locking nut, 4. cup head screw, 5. gasket, 6. eccentric sleeve, 7. shaft, 8. side plate, 9. die forging, 10. clamp, 11. three claws, 12. tightening screw. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0019] Reference Figure 1 The structure of the device of the present invention is that it comprises a core shaft 1, two shafts 7 and a pair of side plates 8. The outer cylindrical surface of the inner end step of the core shaft 1 is provided with an external thread 1, which is used to connect with the prefabricated threaded hole in the concave part of the die forging 9. The outer cylindrical surface of the outer end step of the core shaft 1 is an external thread 2, which is used to install two main locking nuts 3. The outer thread 2 and the outer thread 1 of the core shaft 1 are between the polished rod section, and a rod head is also provided outside the outer thread 2 of the core shaft 1; the outer end step of the core shaft 1 is fitted with a limit plate 2 and two main locking nuts 3, the core shaft 1 passes through the center hole of the limit plate 2, the limit plate 2 is located inside the two main locking nuts 3, and the rod head extends beyond the limit plate 2 and the two main locking nuts 3, and is used for clamping and connecting with the three claws 11 of the machine tool; a pair of side plates 8 are arranged vertically and relatively parallel, and a pair of side plates 8 are correspondingly opened with a large hole on the upper part and a small hole on the lower part;

[0020] The two shafts 7 are perpendicular to the axis of the core shaft 1 and are respectively located at the upper and lower horizontal positions of the core shaft 1. The two shafts 7 respectively pass through the large hole and the small hole of a pair of side plates 8. An eccentric shaft sleeve 6 is installed in the upper large hole of each side plate 8, and a gasket 5 and a cup head screw 4 are installed on both outer ends of the shaft 7 passing through the pair of eccentric shaft sleeves 6; four tightening screws 12 are also installed in the middle of each side plate 8 (between the large hole and the small hole). When in the installed state, the inner ends of the four tightening screws 12 are simultaneously connected to the outer side surface of the die forging 9 to achieve clamping of both sides of the die forging 9; after installation, the limit plate 2 is in contact with the two shafts 7 at the same time.

[0021] A threaded hole 1 is respectively provided on the four sides of the limit plate 2, and each threaded hole 1 is equipped with an external hexagon screw. The upper and lower external hexagon screws are used to tighten the core shaft 1 to support the centrifugal force that the threaded core shaft 1 bears during the processing, so that the threaded core shaft 1 always remains in the center of the part; the two external hexagon screws on the left and right sides are used to tighten with the inner crotch of the die forging 9 to achieve positioning during the processing.

[0022] The eccentric sleeve 6 is circumferentially eccentric (elliptical eccentricity). Its outer circumference is provided with a near-spacing locating hole (at 0 degrees) and a far-spacing locating hole (at 180 degrees). The eccentricity of the eccentric sleeve 6 adjusts the spacing between the two shafts 7. The same eccentric sleeve 6 can be used with two similar die forgings 9 of different sizes, primarily to enhance interchangeability of these similar die forgings 9. After installation, the eccentric sleeve 6 and side plate 8 do not rotate relative to each other because the hexagon socket screws on the upper side of the side plate 8 pass through the large holes and screw into the upward-facing locating holes of the eccentric sleeve 6. Interchangeability is primarily determined during assembly of the eccentric sleeve 6; the side plate 8 does not rotate.

[0023] The outer surface of the shaft 7 is provided with a plurality of sections (called flat sections, Figure 1 Not all sections are shown in the figure), that is, a short section is provided at each of the threaded sections near both ends (that is, symmetrical along the circumference of the shaft rod 7 and symmetrical along the left and right sides of the shaft rod 7), and a long section is provided in the middle section of the shaft rod 7, and the long section is perpendicular to the short section; the short section is used to be placed on the process installation surface of the die forging 9, and the long section is used to achieve surface contact with the limit plate 2 during installation, thereby realizing the positioning of the limit plate 2 and the two shaft rods 7.

[0024] The large hole and the small hole of each side plate 8 are respectively provided with a radial threaded hole II, and each threaded hole II is equipped with a hexagon socket screw. On the one hand, it is used to tighten the close positioning hole or the long-distance positioning hole of the eccentric sleeve 6, limit the circumferential position of the eccentric sleeve 6, and adjust the distance between the two shafts 7. On the other hand, it is convenient for pre-locking the two shafts 7 during clamping.

[0025] The assembly process of the clamp 10 of the present invention is as follows:

[0026] First, screw the two external hexagonal screws into the threaded holes on both sides of the limit plate 2 and pre-tighten them; the core shaft 1 passes through the center hole of the limit plate 2 in the threaded direction; the inner end of the core shaft 1 is tightened into the prefabricated threaded hole in the concave part of the die forging 9 in a threaded connection manner; the two eccentric bushings 6 are respectively installed in the large holes on the upper part of the side plates 8 on both sides, and the eccentric direction of the eccentric bushings 6 is adjusted according to the size of the die forging 9. After installation, pre-tighten the two cup head screws 4 on the outside of each side plate 8 to ensure that the eccentric bushings 6 do not fall off; slowly turn the cup head screws 4 on the outside of the side plate 8 to pre-lock the upper shaft rod 7 with the limit plate 2, and the assembly direction of the shaft rod 7 is with the flat ends facing upwards;

[0027] Then, according to the size of the die forging 9, gaskets 5 of different thicknesses are installed on both sides, and pre-tightened with cup head screws 4; tighten the hexagonal screws connecting the limit plate 2 and the core shaft 1, and then tighten the two main locking nuts 3, so that the limit plate 2 is in close contact with the long sections of the two shafts 7, and the short sections of the rod bodies of the two shafts 7 are fully pressed against the contact surfaces of the die forging 9; unscrew the hexagonal screws on both sides of the limit plate 2, and extend them to the inner crotch on both sides of the tight die forging 9. The function is to use the hexagonal screws on both sides of the limit plate 2 to pad the die forging 9 and the clamp The gap between the tool 10 increases the rigidity of the core shaft 1; tighten the eight tightening screws 12 (four on each side) on the two side plates 8. Additional gaskets should be used between the tightening screws 12 and the die forging 9 to prevent damage to the surface of the die forging 9; tighten the four cup head screws 4 on the two side plates 8 and the four hexagon socket screws on the top and bottom surfaces of the side plates 8 to ensure full contact between the shaft 7 and the bottom of the hole of the eccentric sleeve 6 to ensure the overall rigidity of the clamp 10; tighten the main locking nut 3 again; tighten the two hexagon socket screws on the top and bottom of the limit plate 2;

[0028] Finally, check whether all screws and nuts are tightened. Figure 2 .

[0029] The working process of this utility model is: Figure 2 First, assemble the fixture 10 of the utility model with the die forging 9; then use the lifting equipment to lift the assembled die forging 9 and the fixture 10, so that the outer end of the mandrel 1 in the fixture 10 is facing the center of the three jaws 11 of the lathe, so that the positioning surface of the mandrel 1 is fully in contact with the end surface of the three jaws 11 for positioning, and finally lock the three jaws 11 to complete the docking with the machine tool. The docked state is as follows: Figure 3 shown.

[0030] The innovative features of this utility model are:

[0031] (1) The core shaft 1 is the main part and the two shafts 7 are the auxiliary parts to disperse the huge centrifugal force during the processing of the die forging 9. The two ends of the core shaft 1 are connected by threads. The limit plate 2 is tightly attached to the two shafts 7 through the cross section to limit the longitudinal freedom of the die forging 9. The side plates 8 are installed at both ends of the two shafts 7 to limit the lateral freedom of the die forging 9. The die forging 9 is locked by adjusting the two main locking nuts 3 on the outside of the limit plate 2;

[0032] (2) The fixture 10 of this device has passed mechanical verification and can theoretically bear a load of up to 10 tons;

[0033] (3) The connecting parts of the clamp 10 of the device adopt a flexible design, and can be used for clampless forgings with similar structures, with strong versatility.

[0034] Example 1

[0035] The die forging 9 is the main arm of the landing gear of an aircraft.

[0036] See Figure 2 First, firmly connect the inner end of the mandrel 1 in the present invention to the prefabricated threaded hole on the inner bottom of the die forging 9, and then assemble the present invention, which is called a clamp 10; finally, extend the outer end of the mandrel 1 of the present invention into the center of the three jaws of the lathe (or rotary processing machine tool) and firmly clamp it with the three jaws. Figure 3 , the machine tool can be turned on to process the die forging 9.

[0037] Example 2

[0038] The die forging 9 is a piston rod of the front landing gear of a certain aircraft.

[0039] See Figure 2 First, firmly connect the inner end of the mandrel 1 in the present invention to the prefabricated threaded hole on the inner bottom of the die forging 9, and then assemble the present invention, which is called a clamp 10; finally, extend the outer end of the mandrel 1 of the present invention into the center of the three jaws of the lathe (or rotary processing machine tool) and firmly clamp it with the three jaws. Figure 3 The machine tool can be turned on to process the die forging 9.

[0040] Example 3

[0041] The die forging 9 is a piston rod of a main landing gear of an aircraft.

[0042] See Figure 2 First, firmly connect the inner end of the mandrel 1 in the present invention to the prefabricated threaded hole on the inner bottom of the die forging 9, and then assemble the present invention, which is called a clamp 10; finally, extend the outer end of the mandrel 1 of the present invention into the center of the three jaws of the lathe (or rotary processing machine tool) and firmly clamp it with the three jaws. Figure 3 The machine tool can be turned on to process the die forging 9.

Claims

1. A rotary processing device for large die forging parts without a chuck, characterized by: The invention comprises a core shaft (1) and two shaft rods (7), wherein the outer cylindrical surface of the inner end step of the core shaft (1) is provided with an external thread 1, the outer cylindrical surface of the outer end step of the core shaft (1) is provided with an external thread 2, a polished rod section is provided between the external thread 2 and the external thread 1 of the core shaft (1), and a rod head is provided outside the external thread 2 of the core shaft (1); the outer end step of the core shaft (1) is provided with a limit plate (2) and two main locking nuts (3), and the core shaft (1) passes through the center hole of the limit plate (2); The two shafts (7) are perpendicular to the axis of the core shaft (1) and are located in the upper and lower horizontal positions of the core shaft (1). Each side of the two shafts (7) is penetrated by a side plate (8). A pair of side plates (8) are respectively provided with a large hole at the top and a small hole at the bottom. An eccentric shaft sleeve (6) is set in the large hole at the top of each side plate (8). Four tightening screws (12) are also installed in the middle of each side plate (8). A gasket (5) and a cup head screw (4) are installed on the outer ends of both sides of each shaft (7).

2. The rotary processing device for large die forging parts without a chuck according to claim 1, characterized in that: The limit plate (2) is located inside the two main locking nuts (3), and the rod head extends beyond the limit plate (2) and the two main locking nuts (3).

3. The rotary processing device for large die forging parts without a chuck according to claim 1, characterized in that: The four side surfaces of the limiting plate (2) are respectively provided with a threaded hole 1, and each threaded hole 1 is equipped with an external hexagonal screw.

4. The rotary processing device for large die forging parts without a chuck according to claim 1, characterized in that: The eccentric shaft sleeve (6) is circumferentially eccentric, and the outer circle of the eccentric shaft sleeve (6) is provided with a short-distance positioning hole and a long-distance positioning hole.

5. The rotary processing device for large die forging parts without a chuck according to claim 1, characterized in that: The outer cylindrical surface of the shaft (7) is provided with multiple sections, namely, a short section is provided on the threaded sections near both ends, and a long section is provided on the middle section of the shaft (7), and the long section is perpendicular to the short section.

6. The rotary processing device for large die forging parts without a chuck according to claim 1, characterized in that: The large hole and the small hole of each side plate (8) are respectively provided with a radial threaded hole 2, and each threaded hole 2 is equipped with a hexagon socket screw.

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