Damping support device for machining magnesium-aluminum light alloy thin-walled cylindrical cylinder and machining method

Abstract

The present application relates to magnesium aluminum light alloy thin-walled cylindrical cylinder piece processing damping support device and processing method, including center support, multiple groups of air bag support group and inflatable air bag, multiple threaded through holes are uniformly arranged on the center support along the circumference, the air bag support group adopts the assembly structure with adjustable width of the outer end clamping port, the inner end of the multiple groups of air bag support group is fixedly connected with the outer end of a support lead screw in a relatively angle-adjustable mode, the inner end of the multiple support lead screws is connected with the multiple threaded through holes on the center support, the inflatable air bag is clamped at the outer end clamping port of the multiple groups of air bag support group, and the outer surface of the inflatable air bag is an elastic supporting surface in contact with the inner wall of the part, so that better processing damping effect and better applicability are achieved.

Description

Technical Field

[0001] This invention belongs to the field of thin-walled parts machining technology, specifically relating to a vibration damping support device and machining method for machining thin-walled cylindrical parts made of magnesium-aluminum lightweight alloy. Background Technology

[0002] With the increasing demands for high speed and high mobility in modern defense and military industries, the requirements for lightweight inertial measurement units (IMUs) are also rising. Lightweighting of IMUs depends on both the size and weight limitations of core components and the rationality of structural design and the application of lightweight materials. Therefore, the demand for thin-walled components from various civilian and military enterprises is also increasing, especially thin-walled components made of lightweight alloys of magnesium and other metals, and titanium alloys. Due to their unique high strength, light weight, and high load-bearing capacity, they are increasingly being used in the aerospace field. However, due to their thin walls and weak rigidity, the machining of thin-walled cylindrical workpieces made of lightweight alloys has always been a key focus and challenge in the machinery industry. Under dynamic cutting forces, strong self-excited vibrations (chatter) easily occur at the contact point between the workpiece and the tool, leaving chatter marks on the workpiece surface, severely affecting machining efficiency and surface accuracy. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes a vibration damping support device and processing method for machining thin-walled cylindrical parts made of magnesium-aluminum lightweight alloy, which achieves better vibration damping effects, has good applicability, and is safe and reliable.

[0004] One of the above-mentioned objectives of the present invention is achieved by the following technical solution:

[0005] A vibration damping support device for machining thin-walled cylindrical parts made of magnesium-aluminum lightweight alloy is characterized by comprising a central support, multiple sets of airbag support groups, and inflatable airbags; multiple threaded through holes are evenly distributed along the circumference of the central support; the airbag support groups adopt an assembly structure with adjustable width of the outer end clamping opening, and the inner ends of the multiple sets of airbag support groups are respectively fixedly connected to the outer end of a support screw in a way that the relative angle is adjustable, and the inner ends of the multiple support screws are connected to the multiple threaded through holes on the central support; the inflatable airbags are clamped at the outer end clamping openings of the multiple sets of airbag support groups, and the outer surface of the inflatable airbags is an elastic support surface that contacts the inner wall of the part.

[0006] Furthermore, the airbag support assembly consists of four groups, with the central support being a rectangular frame support. A boss is provided at the center of the outer side of each side of the frame, and a threaded through hole is vertically provided on each boss and the corresponding frame. A threaded locking groove is provided between the outer surface of the boss and the corresponding frame. Two screw through holes are provided on the boss on one side of the threaded locking groove, and two threaded holes corresponding to the two screw through holes on the boss are provided on the frame on one side of the threaded locking groove. By tightening the screws in the screw through holes on the boss and the corresponding threaded holes on the frame, the boss on the side of the threaded locking groove undergoes elastic deformation, pressing the threaded sidewall of the support screw and locking the support screw.

[0007] Furthermore, the airbag support assembly includes the support screw, the opening and closing nut, the airbag support, the clamping slider, and the opening and closing connector; the outer end of the support screw is provided with a spherical cavity, the spherical cavity is a spherical cavity with a surface area greater than 0.5 spherical surface, and multiple elastic deformation grooves are provided around the spherical cavity; a ball head is provided at the inner end of the airbag support, the ball head is pressed into the corresponding spherical cavity, and the opening and closing nut is locked on the support screw at the position corresponding to the spherical cavity, so that the ball head is locked and fixed in the spherical cavity.

[0008] Furthermore, the airbag support is an L-shaped support, consisting of a base plate and a side plate. The side plate is fan-shaped, and the upper half of the inner side of the side plate is the airbag contact surface, which is an outward-facing bevel. A threaded hole is provided in the middle of the lower half of the side plate, and the threaded hole is a right-hand threaded hole. Three guide posts are vertically fixed on the inner side of the lower half of the side plate, around the threaded hole. The ball head is vertically fixed to the middle of the outer side of the base plate.

[0009] The overall shape of the clamping slider is consistent with the shape of the side plate of the airbag bracket; the upper half of the inner side of the clamping slider is the airbag contact surface, which is an outward-facing bevel, and the airbag contact surface on the clamping slider is symmetrically arranged with the airbag contact surface on the airbag bracket; a threaded hole is provided in the middle of the lower half of the clamping slider, which is a left-hand threaded hole; three guide holes are vertically arranged on the inner side of the lower half of the clamping slider around the threaded hole, and these three guide holes cooperate with the three guide posts to achieve the guiding and limiting of the clamping slider;

[0010] The opening and closing connector adopts a double-headed bolt type opening and closing connector, with left and right threads at both ends of the screw, which are respectively connected to the left threaded hole on the locking slider and the right threaded hole on the airbag bracket.

[0011] Furthermore, the bolt head of the double-ended bolt-type opening and closing connector has a built-in hexagonal hole for inserting a wrench.

[0012] The second objective of this invention is achieved through the following technical solution:

[0013] A method for machining thin-walled cylindrical parts made of magnesium-aluminum lightweight alloy, using the aforementioned vibration damping support device for machining thin-walled cylindrical parts made of magnesium-aluminum lightweight alloy, includes the following steps:

[0014] Step 1: Screw the inner ends of the four support screws into the four threaded through holes on the central support respectively. Adjust the extension length of the support screws according to the diameter of the parts to make the extension length consistent. After adjustment, tighten the threaded locking groove on the central support with screws to fix the support screws.

[0015] Step 2: Screw the opening and closing nut into the bracket screw to the middle position, and at the same time press the inner ball head of each of the four airbag brackets into the spherical sockets on the outer end of the four bracket screws; adjust the orientation of the ball head, screw the opening and closing nut outward, and lock the ball head through the opening and closing nut. Then use screws to press the threaded locking groove on the opening and closing nut to prevent the opening and closing nut from falling off.

[0016] Step 3: Place the airbag inside the side plate of the airbag bracket, screw the double-headed bolt type opening and closing connector into the right-hand threaded hole of the airbag bracket, and after the pressing slider is engaged with the airbag bracket guide post through the guide hole, screw the double-headed bolt type opening and closing connector into the left-hand threaded hole of the pressing slider. Adjust the width of the airbag bracket by rotating the double-headed bolt according to the width of the workpiece.

[0017] (4) After assembly, the device is installed inside the part and inflated through the airbag inflation port so that the two sides inside the airbag contact with the airbag contact surface on the airbag bracket and the airbag contact surface on the pressing slider respectively, and the outer surface of the airbag is in close contact with the inner wall of the part. At the same time, the double-headed bolt can be finely adjusted to squeeze the airbag and control the airbag support force.

[0018] Step 5: Clamp the part with the vibration damping support device installed inside onto the machine tool and perform turning. During the machining process, the airbag applies elastic support force to the part, which achieves a good vibration damping effect.

[0019] Step 6: After the parts are machined, deflate the airbag and remove the device.

[0020] The advantages and positive effects of this invention are as follows:

[0021] (1) The present invention uses replaceable rubber inflatable airbag contact parts, which are highly versatile, have good contour adaptability, and have obvious vibration reduction effect.

[0022] (2) The airbag support part of the present invention adopts a telescopic inclined slider design with adjustable thickness to adapt to parts of different lengths. At the same time, the inclined plane lifts the airbag, making it safe and reliable to contact the parts, and the shock absorption effect is obvious.

[0023] (3) The support screw of the present invention adopts a ball hinge design to connect with the airbag support, which has high degree of freedom and strong adaptability.

[0024] (4) The present invention adopts a four-position support screw and a square support connection method, so that the airbag support can be extended and retracted in the radial direction. At the same time, the support screw adopts a single-action design, which can adapt to thin-walled parts with different diameters and irregular inner walls.

[0025] (5) The connection between the support screw and the central support and the airbag support of the present invention is designed with a threaded locking groove structure, which makes locking convenient and reliable. Attached Figure Description

[0026] Figure 1 This is a front view of the overall structure of the present invention;

[0027] Figure 2 This is a perspective view of the overall structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the central support of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the threaded locking groove on the central support of the present invention;

[0030] Figure 5 This is a structural view of the support screw and the opening / closing nut of the present invention;

[0031] Figure 6 This is a structural view of the airbag support and clamping slider of the present invention;

[0032] Figure 7 This is a structural diagram of the double-headed bolt type opening and closing connector of the present invention.

[0033] Figure 8 This is a structural diagram of the inflatable airbag of the present invention. Detailed Implementation

[0034] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0035] Please refer to the following: A vibration damping support device for machining thin-walled cylindrical parts made of magnesium-aluminum lightweight alloy. Figures 1-8 The invention comprises three parts: a central support 1, an airbag support assembly 2, and an inflatable airbag 3. The central support is square-shaped and connects to four airbag support assemblies via four threaded holes and support screws. Each airbag support assembly consists of a support screw, a hinge nut, an airbag support, a locking slider, and a hinged connector. The airbag support assemblies are radially fixed to the central support via the support screw. The outer end of the support screw is connected to the airbag support via a ball joint and locked with a nut. The distance between the airbag support and the locking slider can be adjusted to accommodate thin-walled workpieces of varying widths, while simultaneously controlling the airbag pressure to adhere to the inner wall of the machined part and improve vibration damping.

[0036] The specific structure of each part is as follows:

[0037] Central support:

[0038] like Figure 3 and Figure 4 As shown, the overall shape is a rectangular frame, and all elements are symmetrical. Specifically, a boss 1.1 is provided at the center of the outer side of each side of the frame, and a threaded through hole 1.2 is vertically provided on each boss and the corresponding frame. The threaded through hole is used to cooperate with the support screw of the airbag support assembly, and the extension length of the support screw can be controlled by rotating the support screw. To achieve locking after the support screw is adjusted to the correct position, a threaded locking groove 1.5 is provided between the boss and the outer surface of the corresponding frame (details are as follows). Figure 2 As shown, two screw through holes 1.3 are provided on the boss on one side of the threaded locking groove, and two threaded holes 1.4 are provided on the frame on one side of the threaded locking groove, corresponding one-to-one with the two screw through holes on the boss. By tightening the screws in the screw through holes on the boss and the corresponding threaded holes on the frame, the boss on the side of the threaded locking groove undergoes elastic deformation, pressing the threaded side wall of the bracket screw, producing a locking effect, and locking the bracket screw.

[0039] Airbag support assembly:

[0040] Includes the support screw 2.1 and the opening / closing nut 2.2. Figure 5 This is a schematic diagram of the support screw and the opening / closing nut. The left end of the diagram is the support screw, and the right end is the opening / closing nut.

[0041] The support screw is externally threaded, and its outer end has a spherical recess 2.1.2. The diameter of the cross-section of the outer end face of the spherical recess is smaller than the diameter of the spherical recess itself. The spherical recess is used to mate with the ball head at the inner end of the airbag support. The outer end has six elastic deformation grooves 2.1.1, which evenly divide the circumference. Due to the above design, when installing the two, the ball head is aligned with the spherical recess and pressure is applied. When the pressure reaches a certain value, the outer end of the support screw will undergo elastic deformation. After the ball head and the spherical recess are in contact, the outer end of the support screw returns to its original shape. After installation, the ball head can rotate freely. After the two are engaged, the ball head extends into the spherical recess. At this time, if the opening nut is turned to the "open" part and further turning downwards to apply a tightening force, the ball head can be locked.

[0042] The split nut has an internal threaded hole that mates with the support screw thread, and an external hexagonal shape for easy turning with conventional tools. A threaded locking groove 2.2.1 is located at the center of the split nut along its axial direction. Two threaded holes 2.2.2 are located on one side of the threaded locking groove, serving as nut locking holes. On the other side of the threaded locking groove are screw through holes corresponding to the two nut locking holes. When screws are installed and tightened in the nut locking holes and corresponding screw through holes, the threaded locking groove deforms under pressure, achieving a locking effect. At this time, a wrench can be used to turn the support screw using the external hexagonal shape of the split nut, causing the support screw to extend and retract along the central support. Simultaneously, a double locking effect is created with the ball head.

[0043] Includes an airbag support 2.3 and a clamping slider 2.6.

[0044] Figure 6 This is a schematic diagram of the airbag support and clamping slider. The airbag support is on the right and the clamping slider is on the left. Figure 7 It is an opening and closing connector.

[0045] The airbag support is an L-shaped support, consisting of a base plate and side plates. The side plates are fan-shaped, with the upper half of the inner side surface of the side plate serving as the airbag contact surface 2.3.1. The airbag contact surface uses an outward-facing bevel to achieve tangential contact with the airbag surface. A threaded hole 2.3.2 is provided in the middle of the lower half of the side plate; this threaded hole is a right-hand thread. Three guide posts 2.4 are vertically fixed on the inner side of the lower half of the side plate, around the threaded hole, to guide the movement of the clamping slider and also to restrict the slider's degrees of freedom. A ball head 2.5 is vertically fixed in the middle of the outer side of the base plate, and the ball head mates with the ball socket of the support screw.

[0046] The overall shape of the clamping slider is consistent with the shape of the side plate of the airbag bracket. The upper half of the inner side of the clamping slider is the airbag contact surface. The airbag contact surface adopts an outward-facing bevel to achieve tangential contact with the airbag surface. The airbag contact surface on the clamping slider is symmetrically arranged with the airbag contact surface on the airbag bracket. A threaded hole 2.6.1 is provided in the middle of the lower half of the clamping slider. This threaded hole is a left-hand threaded hole. Three guide holes 2.6.2 are vertically arranged on the inner side of the lower half of the clamping slider, located around the threaded hole. These three guide holes cooperate with the three guide posts mentioned above to achieve guiding and limiting.

[0047] The threaded holes on the airbag bracket and the threaded holes on the clamping slider are set in opposite directions. They can be used with the double-headed bolt type opening and closing connector 2.7 to realize the relative movement adjustment between the airbag bracket and the clamping slider, thereby achieving the purpose of adjusting the width of the supporting airbag and thus meeting the purpose of supporting thin-walled cylindrical parts with different axial dimensions.

[0048] The screw of the double-headed bolt type opening and closing connector has left and right threaded ends, which are connected to the locking slider and the airbag bracket. When rotated, the two will move relative to each other. The bolt head is designed with an internal hexagon 2.7.1, which is convenient to rotate with a wrench.

[0049] 3 inflatable airbags

[0050] Figure 8 This is a schematic diagram of an inflatable airbag. The entire airbag is an inflatable ring made of rubber. Different sizes of airbags can be replaced according to different diameter parts. When in use, it can be inflated through the inflation port. After the aforementioned device is installed and fitted, it is placed in the middle of the airbag. The airbag support group compresses it, increasing the internal air pressure. While adhering to the inner hole of the part, it also plays a role in vibration reduction.

[0051] The method of using the vibration damping support device of the present invention is as follows:

[0052] (1) Screw the inner ends of the four support screws into the four threaded through holes on the central support respectively. Adjust the extension length of the support screws according to the diameter of the parts to keep the extension length consistent. After adjustment, tighten the threaded locking groove on the central support with screws to fix the support screws.

[0053] (2) Screw the opening and closing nut into the bracket screw to the middle position (the specific position is not fixed and does not affect subsequent operations). At the same time, press the inner ball head of each of the four airbag brackets into the spherical socket of the outer end of the four bracket screws. Adjust the position of the ball head, screw the opening and closing nut outward, and lock the ball head through the opening and closing nut. Then use screws to press the threaded locking groove on the opening and closing nut to prevent the opening and closing nut from falling off.

[0054] (3) Place the airbag inside the side plate of the airbag bracket (i.e., the open end of the airbag bracket), screw the double-ended bolt into the right-hand threaded hole of the airbag bracket, and after the clamping slider is connected to the airbag bracket guide post through the guide hole, screw the double-ended bolt into the left-hand threaded hole of the clamping slider. Adjust the width of the airbag bracket by rotating the double-ended bolt according to the width of the workpiece.

[0055] (4) After assembly (e.g.) Figure 1 and 2 As shown, the device is installed inside the part and inflated through the airbag inflation port, so that the two sides of the inside of the airbag contact with the airbag contact surfaces on the airbag bracket and the pressure slider, respectively, and the outer surface of the airbag is in close contact with the inner wall of the part to achieve a vibration reduction effect. At the same time, the double-headed bolt can be finely adjusted to compress the airbag and control the airbag support force;

[0056] (5) The part with the vibration damping support device installed inside is clamped onto the machine tool and turned. During the machining process, the airbag applies elastic support force to the part, which achieves a good vibration damping effect.

[0057] (6) After the parts are finished, deflate the airbag and remove the device.

[0058] Repeated processing can be performed by reinstalling the mechanism and re-inflating it. After replacing the airbag or adjusting the extension length of the bracket screw, unscrew the two screws on the central bracket boss, adjust the position, and then tighten the screws. If you need to adjust the airbag orientation or adapt to the part contour, loosen the opening and closing nut, and then rotate the airbag bracket connected by the ball head to change the airbag orientation. After adjustment, tighten the opening and closing nut.

[0059] This invention can be used for vibration damping supports of thin-walled parts in industries such as aerospace, aviation, shipbuilding, and precision instruments, and has a very broad prospect for promotion and application in the field of complex batch production.

[0060] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A vibration damping support device for machining thin-walled cylindrical parts made of magnesium-aluminum lightweight alloy, characterized in that: It includes a central support, multiple airbag support assemblies, and an inflatable airbag. Multiple threaded through holes are evenly distributed circumferentially on the central support. The airbag support assemblies adopt an adjustable outer end clamping port structure. The inner ends of the multiple airbag support assemblies are respectively fixedly connected to the outer end of a support screw in a relatively adjustable manner. The inner ends of the multiple support screws are connected one by one to the multiple threaded through holes on the central support. The inflatable airbag is clamped at the outer end clamping port of the multiple airbag support assemblies, and the outer surface of the inflatable airbag is an elastic support surface that contacts the inner wall of the component. The airbag support assembly consists of four groups, and the central support is a square frame support. A boss is provided in the middle of the outer side of each side of the square frame. A threaded through hole is vertically provided on each boss and the corresponding frame. A threaded locking groove is provided between the outer surface of the boss and the corresponding frame. Two screw through holes are provided on the boss on one side of the threaded locking groove. Two threaded holes corresponding to the two screw through holes on the boss are provided on the frame on one side of the threaded locking groove. By tightening the screws in the screw through holes on the boss and the corresponding threaded holes on the frame, the boss on the side of the threaded locking groove undergoes elastic deformation, pressing the threaded side wall of the support screw, thereby locking the support screw. The airbag support assembly includes the support screw, the opening and closing nut, the airbag support, the clamping slider, and the opening and closing connector; the outer end of the support screw is provided with a spherical cavity, the spherical cavity is a spherical cavity with a surface area greater than 0.5 mm, and multiple elastic deformation grooves are provided around the spherical cavity; a ball head is provided at the inner end of the airbag support, the ball head is pressed into the corresponding spherical cavity, and the opening and closing nut is locked on the support screw at the position corresponding to the spherical cavity, so that the ball head is locked and fixed in the spherical cavity; The airbag support is an L-shaped support, consisting of a base plate and a side plate. The side plate is fan-shaped, and the upper half of the inner side of the side plate is the airbag contact surface, which is an outward-facing bevel. A threaded hole is provided in the middle of the lower half of the side plate, and the threaded hole is a right-hand threaded hole. Three guide posts are vertically fixed on the inner side of the lower half of the side plate, around the threaded hole. The ball head is vertically fixed to the middle of the outer side of the base plate. The overall shape of the clamping slider is consistent with the shape of the side plate of the airbag bracket; the upper half of the inner side of the clamping slider is the airbag contact surface, which is an outward-facing bevel, and the airbag contact surface on the clamping slider is symmetrically arranged with the airbag contact surface on the airbag bracket; a threaded hole is provided in the middle of the lower half of the clamping slider, which is a left-hand threaded hole; three guide holes are vertically arranged on the inner side of the lower half of the clamping slider around the threaded hole, and these three guide holes cooperate with the three guide posts to achieve the guiding and limiting of the clamping slider.

2. The vibration damping support device for machining thin-walled cylindrical parts of magnesium-aluminum lightweight alloy according to claim 1, characterized in that: The opening and closing connector adopts a double-headed bolt type opening and closing connector, with left and right threads at both ends of the screw, which are respectively connected to the left threaded hole on the locking slider and the right threaded hole on the airbag bracket.

3. The vibration damping support device for machining thin-walled cylindrical parts of magnesium-aluminum lightweight alloy according to claim 2, characterized in that: The bolt head of the double-ended bolt-type hinged connector has a built-in hexagonal hole for inserting a wrench.

4. A method for processing thin-walled cylindrical parts of magnesium-aluminum lightweight alloy, using the vibration damping support device for processing thin-walled cylindrical parts of magnesium-aluminum lightweight alloy as described in claim 2 or 3, comprising the following steps: Step 1: Screw the inner ends of the four support screws into the four threaded through holes on the central support respectively. Adjust the extension length of the support screws according to the diameter of the parts to make the extension length consistent. After adjustment, tighten the threaded locking groove on the central support with screws to fix the support screws. Step 2: Screw the opening and closing nut into the bracket screw to the middle position, and at the same time press the inner ball head of each of the four airbag brackets into the spherical sockets on the outer end of the four bracket screws; adjust the orientation of the ball head, screw the opening and closing nut outward, and lock the ball head through the opening and closing nut. Then use screws to press the threaded locking groove on the opening and closing nut to prevent the opening and closing nut from falling off. Step 3: Place the airbag inside the side plate of the airbag bracket, screw the double-headed bolt type opening and closing connector into the right-hand threaded hole of the airbag bracket, and after the pressing slider is engaged with the airbag bracket guide post through the guide hole, screw the double-headed bolt type opening and closing connector into the left-hand threaded hole of the pressing slider. Adjust the width of the airbag bracket by rotating the double-headed bolt according to the width of the workpiece. Step 4: After assembly, install the device inside the part and inflate it through the airbag inflation port so that the two sides inside the airbag contact with the airbag contact surface on the airbag bracket and the airbag contact surface on the pressing slider respectively, and the outer surface of the airbag is in close contact with the inner wall of the part. At the same time, the double-headed bolt can be finely adjusted to squeeze the airbag and control the airbag support force. Step 5: Clamp the part with the vibration damping support device installed inside onto the machine tool and perform turning. During the machining process, the airbag applies elastic support force to the part, which achieves a good vibration damping effect. Step 6: After the parts are machined, deflate the airbag and remove the device.

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