Titanium alloy framework machining clamp

Abstract

The application discloses a titanium alloy framework machining clamp and relates to the technical field of titanium alloy part machining.The titanium alloy framework machining clamp comprises a protective support shell, an inner central support plate, an operating clamping disc, a central spindle, a support shaft sleeve, a servo control motor, a screw rod, a swing adjusting electric cylinder, a scrap discharge conical surface and a scrap scraper structure.Before machining, the titanium alloy framework is stably supported and positioned through a plurality of support strips and a support height adjusting electric cylinder; after machining, the driven motor is linked to shake out the disc to rotate and shake out the scrap, the scrap scraper is synchronously scraped and guided to be discharged, the closed loop cleaning of the scrap management is realized, and the long-term reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy parts processing technology, specifically a titanium alloy skeleton processing fixture. Background Technology

[0002] Titanium alloy frames (such as aerospace structural components and medical bone support frames) are characterized by high strength, low density, and corrosion resistance. However, the material has high hardness and a high modulus of elasticity, and the parts are often irregular curved surfaces or irregularly shaped frame structures, making them prone to problems such as vibration displacement, stress concentration at clamping points, and unstable support during processing. Existing titanium alloy frame machining fixtures mainly suffer from the following problems: Fixed mechanical fixtures typically employ rigid fixed jaws with a single screw or a manually adjustable structure. They suffer from poor synchronization of clamping displacement and cannot independently adapt to the clamping requirements of multiple irregular edges. When faced with irregular skeletons, they often exhibit local under-constraint or over-constraint states, leading to part swaying or deformation and limiting machining accuracy.

[0003] Fixtures without chip management structure: Existing fixtures generally do not have a closed-loop cleaning mechanism for receiving, throwing out, scraping, and directional discharge of machining chips. Chips tend to accumulate in the clamping plate and the space below, and enter the lead screw groove or bearing parts, causing wear, jamming, or even sensor misjudgment, resulting in decreased reliability over long-term use. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides the following technical solution: a titanium alloy skeleton machining fixture, comprising an inner central support plate and an operating clamping disk, wherein the center of the lower surface of the operating clamping disk is fixed on a central spindle, the central spindle is rotatably inserted into a support sleeve, a drive ejector disk is fixedly mounted on the support sleeve, the drive ejector disk is located below the operating clamping disk, and the operating clamping disk and the drive ejector disk are coaxially engaged, the support sleeve is rotatably inserted into the center position of the inner central support plate; the operating clamping disk has at least four clamping block guide grooves and four support bar embedding grooves in the radial direction, wherein a support bar is slidably inserted in each support bar embedding groove, and a clamping block is slidably disposed in each clamping block guide groove; the clamping blocks... A first swing rod and a second swing rod are movably mounted on one side pointing towards the center of the operating clamping disc. The ends of the first and second swing rods away from the clamping block are movably connected to the clamping head. The first and second swing rods are parallel to each other, and the clamping head is parallel to the clamping block. A swing clearance cavity is provided inside the clamping block. An amplitude adjustment electric cylinder is installed inside the swing clearance cavity to control the tilt angle of the first swing rod on the clamping block. The end of the telescopic cylinder of the amplitude adjustment electric cylinder is movably connected to the inner wall of the swing clearance cavity. A C-shaped connector is fixed to the end of the telescopic rod of the amplitude adjustment electric cylinder. The C-shaped connector is movably connected to the middle of the first swing rod. A pressure sensor is provided on the side of the clamping head away from the clamping block to monitor the clamping force of the clamping head on the titanium alloy skeleton.

[0005] Preferably, the inner central support plate is fixed to the inner wall of the protective support shell, and a protective frame is fixedly provided on the top of the protective support shell, wherein the operating clamping plate is located inside the protective frame, and the upper surface of the operating clamping plate is lower than the height of the top edge of the protective frame.

[0006] Preferably, a debris discharge cone is provided on the circumference of the upper surface of the inner central support plate, and the top edge of the debris discharge cone is not higher than the height of the upper surface of the drive ejector plate; a debris scraper is slidably installed on the circumferential surface of the debris discharge cone, and the debris scraper is fixed to the edge of the drive ejector plate; a debris discharge port is provided on the protective support shell at the bottom edge of the debris discharge cone.

[0007] Preferably, a base is fixedly installed on the bottom surface of the inner wall of the protective support shell, and a support spline shaft is fixedly installed on the base. An electromagnet disc is sleeved on the support spline shaft by means of spline sliding. An elastic component is provided between the electromagnet disc and the base to pull the electromagnet disc toward the base. A limiting friction disc is magnetically engaged above the electromagnet disc, and the opposing surfaces of the limiting friction disc and the electromagnet disc are in frictional engagement. The limiting friction disc is coaxially fixed to the bottom end of the central spindle. The support bushing is driven by a drive motor fixed on the inner central support plate. A driven belt disc, which is fixedly engaged with the support bushing, is rotatably installed at the center of the lower surface of the inner central support plate. A drive motor is fixedly installed on the inner central support plate, and the output shaft of the drive motor is connected to the driven belt disc through a transmission belt.

[0008] Preferably, each support bar is fitted with a support height adjustment cylinder below the groove, the end of the telescopic rod of the support height adjustment cylinder is fixed to the support bar, and all support height adjustment cylinders are fixed to the lower surface of the operating clamping plate by the adjustment cylinder mounting bracket.

[0009] Preferably, each clamping block guide groove is rotatably mounted with a lead screw arranged along the length of the clamping block guide groove, wherein the clamping block is threadedly sleeved on the lead screw.

[0010] Preferably, the circumferential surface of the operating clamping disk is fixed with the same number of servo control motors as the lead screw, and the output shaft of the servo control motor is fixedly engaged with the lead screw to drive the clamping block to slide in the clamping block guide groove.

[0011] Compared with the prior art, the present invention has the following advantages: (1) The present invention sets multiple support bars that can be independently vertically displaced in the groove of the support bar embedded in the operating clamping plate, and controls the support height in real time by the support height adjustment electric cylinder. It can adapt to multi-point support according to the actual deformation profile of the titanium alloy skeleton, and avoid the under-constraint / over-constraint problem caused by single-point or synchronous height support of the existing fixture. The independent adjustment mechanism combined with sensor feedback can significantly improve the support consistency, so that the skeleton can obtain stable and balanced bottom constraint before processing, and improve the repeatability positioning accuracy; (2) The radially arranged servo control motor drives the lead screw of the present invention to realize the independent displacement control of each clamping block, swing rod and clamping head, and triggers the motor stop signal after the pressure sensor judges that the standard contact pressure is met, which solves the problem that the existing synchronous displacement fixture cannot fit the edge of the irregular skeleton. It can achieve precise edge point constraint adaptation, improve clamping stability and contact pressure consistency, avoid local stress concentration at clamping points causing micro-deformation of the skeleton, and improve machining dimensional accuracy; (3) The present invention sets a coaxial drive ejection disc below the operating clamping disc to receive debris, and with the debris discharge cone, debris scraper and debris discharge port, a closed-loop cleaning mechanism of debris receiving-throwing-guiding-scraping-directional discharge is formed, which avoids debris from accumulating in the lead screw groove or bearing due to long-term accumulation, reduces wear of moving structure, avoids jamming, improves long-term operational reliability, and solves the problem of short structural life caused by debris accumulation in existing fixtures; (4) The present invention controls the tilt angle of the first swing rod by adjusting the amplitude electric cylinder, thereby adjusting the vertical height of the clamping head, so that the center of the clamping head is aligned with the center of the titanium alloy skeleton frame, further improving clamping stability and avoiding clamping eccentricity caused by different heights. Compared with existing non-adjustable height fixtures, it can improve the contact torque balance, reduce the transmission of machining vibration, and improve machining stability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 This is a structural diagram of the protective frame of the present invention.

[0014] Figure 3 This is a diagram showing the installation location of the drive ejector disc of the present invention.

[0015] Figure 4 This is a structural diagram of the clamping disc of the present invention.

[0016] Figure 5 This is a diagram showing the installation position of the support bar of the present invention.

[0017] Figure 6 This is a diagram showing the installation position of the clamping block in this invention.

[0018] Figure 7 This is a cross-sectional view of the clamping block structure of the present invention.

[0019] In the diagram: 101-Protective support shell; 102-Debris discharge port; 103-Protective frame; 104-Inner central support plate; 105-Debris scraper; 106-Debris discharge cone; 107-Drive ejector disc; 108-Central spindle; 109-Drive motor; 110-Transmission belt; 111-Driven belt reel; 112-Support bushing; 113-Friction limiting disc; 114-Electromagnet disc; 115-Base; 116-Support splined shaft ; 201-Operating clamping plate; 202-Support bar; 203-Support bar embedded in the slide groove; 204-Support height adjustment electric cylinder; 205-Adjustment electric cylinder mounting bracket; 206-Clamping block guide slide groove; 207-Servo control motor; 208-Lead screw; 209-Clamping block; 210-Clamping head; 211-C-shaped connector; 212-Amplitude adjustment electric cylinder; 213-First swing rod; 214-Second swing rod; 215-Swing avoidance cavity. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1-7As shown, the present invention provides a titanium alloy skeleton machining fixture, including an inner central support plate 104 and an operating clamping plate 201. The center of the lower surface of the operating clamping plate 201 is fixed on a central spindle 108, which is inserted into a support sleeve 112. The central spindle 108 and the support sleeve 112 are rotatably coupled via bearings. A drive ejection plate 107 is fixedly mounted on the support sleeve 112, located below the operating clamping plate 201, and the operating clamping plate 201 and the drive ejection plate are connected. The disc 107 is coaxially fitted, and the support sleeve 112 is rotatably inserted into the center of the inner central support plate 104; the operating clamping disc 201 has at least four clamping block guide grooves 206 and four support bar embedding grooves 203 in the radial direction, wherein a support bar 202 is slidably inserted into each support bar embedding groove 203, and a clamping block 209 is slidably disposed in each clamping block guide groove 206; a first swing rod 213 and a second swing rod 209 are movably installed on the side of the clamping block 209 pointing towards the center of the operating clamping disc 201. A swing rod 214 is provided, wherein the ends of the first swing rod 213 and the second swing rod 214 away from the clamping block 209 are movably connected to the clamping head 210. The first swing rod 213 and the second swing rod 214 are parallel to each other, and the clamping head 210 is parallel to the clamping block 209. A swing avoidance cavity 215 is provided inside the clamping block 209. An amplitude adjustment electric cylinder 212 for controlling the tilt angle of the first swing rod 213 on the clamping block 209 is provided inside the swing avoidance cavity 215. The end of the telescopic cylinder of the amplitude adjustment electric cylinder 212 is telescopic. The extension rod of the amplitude adjustment electric cylinder 212 is movably connected to the inner wall of the swing avoidance cavity 215. A C-shaped connector 211 is fixed to the end of the extension rod. The C-shaped connector 211 is movably connected to the middle of the first swing rod 213. A pressure sensor is provided on the side of the clamping head 210 away from the clamping block 209 to monitor the clamping force of the clamping head 210 on the titanium alloy skeleton. This controls the output rotation angle of the servo control motor 207 and ultimately adjusts the clamping force to ensure the stability of the multiple clamping heads 210 clamping the titanium alloy skeleton.

[0022] An inner central support plate 104 is fixed to the inner wall of the protective support housing 101. A protective frame 103 is fixedly mounted on the top of the protective support housing 101. The operating clamping plate 201 is located inside the protective frame 103, and the upper surface of the operating clamping plate 201 is lower than the height of the top edge of the protective frame 103. A debris discharge cone 106 is provided on the circumference of the upper surface of the inner central support plate 104. The top edge of the debris discharge cone 106 is not higher than the height of the upper surface of the drive ejection plate 107 (the height difference between the top edge of the debris discharge cone 106 and the upper surface of the drive ejection plate 107 is less than the thickness of the drive ejection plate 107 itself). A debris scraper 105 is slidably mounted on the circumferential surface of the debris discharge cone 106. The debris scraper 105 is fixed to the edge of the drive ejection plate 107. A debris discharge port 102 is provided on the protective support housing 101 at the bottom edge of the debris discharge cone 106. A base 115 is fixedly installed on the bottom surface of the inner wall of the protective support shell 101. A support spline shaft 116 is fixedly installed on the base 115. An electromagnet disc 114 is sleeved on the support spline shaft 116 via a spline sliding mechanism. An elastic component is provided between the electromagnet disc 114 and the base 115 to pull the electromagnet disc 114 toward the base 115. A limiting friction disc 113 is magnetically attracted above the electromagnet disc 114. The relative movement of the limiting friction disc 113 and the electromagnet disc 114... The system employs a surface friction fit, wherein the limiting friction disc 113 is coaxially fixed to the bottom end of the central spindle 108; the support bushing 112 is driven by a drive motor 109 fixed on the inner central support plate 104, and a driven belt disc 111, which is fixedly fitted to the support bushing 112, is rotatably mounted at the center of the lower surface of the inner central support plate 104; the drive motor 109 is fixedly mounted on the inner central support plate 104, and the output shaft of the drive motor 109 is connected to the driven belt disc 111 via a transmission belt 110. Each support bar is embedded in the slide groove 203 and a support height adjustment cylinder 204 is provided below it. The end of the telescopic rod of the support height adjustment cylinder 204 is fixed to the support bar 202, and all support height adjustment cylinders 204 are fixed to the lower surface of the operating clamping disc 201 via an adjustment cylinder mounting bracket 205. Each clamping block guide groove 206 is rotatably mounted with a lead screw 208 arranged along the length of the clamping block guide groove 206, wherein the clamping block 209 is threadedly sleeved on the lead screw 208. The circumferential surface of the operating clamping disk 201 is fixed with the same number of servo control motors 207 as the lead screws 208. The output shafts of the servo control motors 207 are fixedly engaged with the lead screws 208 and are used to drive the clamping blocks 209 to slide within the clamping block guide groove 206.

[0023] The titanium alloy skeleton to be processed is placed on the operating clamping plate 201. Since the shape of the titanium alloy skeleton may be irregular, it needs to be stably supported first. At this time, multiple support bars 202 are controlled, with different support bars 202 supporting different positions of the titanium alloy skeleton to ensure that the titanium alloy skeleton is placed flat on the upper surface of the operating clamping plate 201. The height of the support bars 202 needs to be controlled by the support height adjustment electric cylinder 204. The extension rod of the support height adjustment electric cylinder 204 drives the support bars 202 to slide vertically within the support bar embedded groove 203, thereby changing the distance between the top edge of the support bar 202 and the upper surface of the operating clamping plate 201, and adapting to different positions of the titanium alloy skeleton. A level is placed on the titanium alloy skeleton (it is necessary to ensure that the clamp is in a horizontal state beforehand). With this as a reference, the extension and retraction of the support height adjustment electric cylinder 204 is controlled to adjust the support of the titanium alloy skeleton to a horizontal state. After the titanium alloy frame is placed, it needs to be clamped. If the titanium alloy frame is circular, all clamping heads 210 need to be controlled to move synchronously towards the titanium alloy frame with the same amount of movement to achieve clamping. If the titanium alloy frame is irregularly shaped, each clamping head 210 needs to be controlled to contact different edges of the titanium alloy frame. Therefore, the displacement of each clamping head 210 will be different. Specifically, this is achieved by controlling the servo control motor 207 corresponding to the clamping head 210 at different positions, and the output shaft of the servo control motor 207... The lead screw 208 rotates, causing the clamping block 209 to move linearly within the guide groove 206. Since the clamping heads 210 are mounted on the clamping blocks 209, they also move synchronously. The servo control motor 207 stops when all clamping heads 210 are in contact with the titanium alloy skeleton. The stop signal for the servo control motor 207 is determined by pressure sensors on the clamping heads 210. The servo control motor 207 only stops when the contact pressure between the clamping heads 210 and the titanium alloy skeleton reaches the specified level. This effectively ensures the stability of the clamping heads 210 in holding the titanium alloy skeleton. Since the height of each titanium alloy skeleton may be different, the vertical height of the clamping head 210 can also be controlled so that the center position of the clamping head 210 clamps the center position of the titanium alloy skeleton frame. This can further improve the stability of the clamping head 210 clamping the titanium alloy skeleton. Specifically, the extension and retraction of the extension rod of the amplitude adjustment cylinder 212 is controlled. The extension and retraction rod of the amplitude adjustment cylinder 212 drives the first swing rod 213 to swing on the clamping block 209 through the C-shaped connector 211, thereby controlling the height between the clamping head 210 and the upper surface of the operating clamping plate 201.

[0024] After machining the titanium alloy skeleton, metal debris remains on the operating clamping plate 201. This debris also falls below the operating clamping plate 201 through the gaps in the clamping block guide groove 206. Therefore, a drive ejection plate 107 is provided below the operating clamping plate 201 to receive the material cut from the titanium alloy skeleton. It should be noted that during the machining of the titanium alloy skeleton, the electromagnet plate 114 needs to be activated. The electromagnet plate 114 generates magnetic force that attracts the limiting friction plate 113. Since the electromagnet plate 114 cannot rotate on the supporting spline shaft 116, the limiting friction plate 113 contacts and rubs against the electromagnet plate 114, thus restricting the rotation of the limiting friction plate 113. The limiting friction plate 113 is fixed to the central spindle 108, therefore, the central spindle 108 cannot rotate, and the operating clamping plate 201 fixed on the central spindle 108 cannot rotate either. The purpose is to ensure the stability of the titanium alloy skeleton during the machining process. After processing, it is necessary to clean the debris on the operating clamping plate 201 and the drive ejection plate 107. At this time, the electromagnet plate 114 is still energized. Start the drive motor 109. The output shaft of the drive motor 109 drives the driven belt plate 111 to rotate through the transmission belt 110. The driven belt plate 111 drives the support shaft sleeve 112 to rotate. The support shaft sleeve 112 drives the drive ejection plate 107 to rotate. At this time, the debris falling on the drive ejection plate 107 will be thrown onto the inclined surface of the debris discharge cone 106. Then, the electromagnet disk 114 is de-energized. At this time, the limiting friction disk 113 separates from the electromagnet disk 114, and the limiting friction disk 113 can rotate freely (the central spindle 108 and the supporting spline shaft 116 are coaxially set, and the central spindle 108 and the supporting spline shaft 116 are rotately engaged. A bearing is also provided on the contact surface between the central spindle 108 and the supporting spline shaft 116). At this time, the rotational friction between the central spindle 108 and the drive ejection disk 107 will drive the limiting friction disk 113 and the operating clamping disk 201 on the central spindle 108 to rotate (a bearing is provided between the central spindle 108 and the drive ejection disk 107, that is, there is friction under normal assembly). Finally, the debris on the operating clamping disk 201 is thrown onto the debris discharge cone surface 106. The protective frame 103 is provided to prevent the debris from flying out. Finally, the debris scraper 105, which follows the rotation of the drive ejector disc 107, scrapes off the debris from the inclined surface of the debris discharge cone 106, and finally discharges it through the debris discharge port 102.

Claims

1. A fixture for machining titanium alloy skeletons, characterized in that: Includes an inner central support plate (104) and an operating clamping plate (201), wherein the center of the lower surface of the operating clamping plate (201) is fixed on the central spindle (108), the central spindle (108) is rotatably inserted into the support bushing (112), the support bushing (112) is fixedly mounted with a drive ejection plate (107), the drive ejection plate (107) is located below the operating clamping plate (201), and the operating clamping plate (201) and the drive ejection plate (107) are coaxially engaged, and the support bushing (112) is rotatably inserted into the center of the inner central support plate (104); protective support shell (1 01) A base (115) is fixedly installed on the bottom surface of the inner wall. A support spline shaft (116) is fixedly installed on the base (115). An electromagnet disk (114) is sleeved on the support spline shaft (116) by means of spline sliding. A limiting friction disk (113) is magnetically attracted above the electromagnet disk (114). The limiting friction disk (113) and the electromagnet disk (114) are in frictional contact with each other. The limiting friction disk (113) is coaxially fixed with the bottom end of the central spindle (108). The support bushing (112) is driven by a drive motor (109) fixed on the inner central support plate (104). The operating clamping disk (201) has at least four clamping block guide grooves (206) and four support bar embedding grooves (203) in the radial direction, wherein a support bar (202) is slidably inserted in each support bar embedding groove (203), and a clamping block (209) is slidably disposed in each clamping block guide groove (206). The clamping block (209) is movably mounted with a first swing rod (213) and a second swing rod (214) on the side facing the center of the operating clamping plate (201). The ends of the first swing rod (213) and the second swing rod (214) away from the clamping block (209) are movably connected to the clamping head (210). A swing avoidance cavity (215) is provided in the clamping block (209). An amplitude adjustment electric cylinder (212) for controlling the tilt angle of the first swing rod (213) on the clamping block (209) is provided in the swing avoidance cavity (215). A pressure sensor is provided on the side of the clamping head (210) away from the clamping block (209) for monitoring the clamping force of the clamping head (210) clamping the titanium alloy skeleton.

2. The titanium alloy skeleton machining fixture according to claim 1, characterized in that: The inner central support plate (104) is fixed on the inner wall of the protective support shell (101). The top of the protective support shell (101) is fixedly equipped with a protective frame (103), wherein the operating clamping plate (201) is located inside the protective frame (103), and the upper surface of the operating clamping plate (201) is lower than the height of the top edge of the protective frame (103).

3. The titanium alloy skeleton machining fixture according to claim 2, characterized in that: The inner central support plate (104) has a debris discharge cone (106) on its upper surface circumferential position. The top edge of the debris discharge cone (106) is not higher than the height of the upper surface of the drive ejection plate (107).

4. A titanium alloy skeleton machining fixture according to claim 3, characterized in that: Each support bar is fitted with a support height adjustment cylinder (204) below the groove (203). The telescopic rod end of the support height adjustment cylinder (204) is fixed to the support bar (202). All support height adjustment cylinders (204) are fixed to the lower surface of the operating clamping plate (201) by the adjustment cylinder mounting bracket (205).

5. A titanium alloy skeleton machining fixture according to claim 4, characterized in that: Each clamping block guide groove (206) is rotatably mounted with a lead screw (208) arranged along the length direction of the clamping block guide groove (206), wherein the clamping block (209) is threadedly sleeved on the lead screw (208).

6. A titanium alloy skeleton machining fixture according to claim 5, characterized in that: The circumferential surface of the operating clamping plate (201) is fixed with the same number of servo control motors (207) as the lead screw (208). The output shafts of the servo control motors (207) are fixedly engaged with the lead screw (208) to drive the clamping block (209) to slide in the clamping block guide groove (206).

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