A marking device for measuring the shrinkage strain ratio of titanium alloy pipe

Abstract

The present application relates to the technical field of metal pipe detection, and specifically discloses a line marking device for measuring the shrinkage strain ratio of titanium alloy pipes, which comprises an X-axis bearing plate, a bearing block slidingly arranged at the bottom end of the X-axis bearing plate, a hydraulic cylinder arranged at the bottom end of the X-axis bearing plate, the output end of the hydraulic cylinder being fixedly connected with the bearing block, a power chuck arranged at the top end of the X-axis bearing plate, a Y-axis bearing frame fixedly arranged at the bottom end of the bearing block, a linear drive assembly arranged in the Y-axis bearing frame, and two sliding seats arranged at the two output ends of the linear drive assembly, respectively, the two sliding seats being symmetrically distributed about the bearing block. The present application realizes real-time monitoring and accurate control of line marking pressure, ensures the consistency of line marking depth and the quality of line marking, realizes quick switching between single-head line marking mode and three-head synchronous line marking mode, and improves the line marking efficiency without the need to replace line marking heads or manually adjust tooling.

Description

Technical Field

[0001] This invention relates to the field of metal pipe testing technology, specifically to a scribing device for measuring the shrinkage strain ratio of titanium alloy pipes. Background Technology

[0002] Shrinkage strain ratio is an important parameter for evaluating the plastic forming performance of metal pipes. It is usually characterized by the ratio of strain in the width direction to strain in the thickness direction of the pipe in a uniaxial tensile test. In high-tech fields such as aerospace, aviation, and energy, titanium alloy pipe bends are widely used, and the shrinkage strain ratio is one of the key indicators for evaluating the bending forming performance of titanium alloy pipes.

[0003] When conducting a shrinkage strain ratio test, gauge marks must be precisely drawn on the surface of the pipe specimen to determine the dimensional changes before and after tension. Specifically, four evenly spaced gauge lines parallel to the axial direction and three equidistant circular lines should be drawn on the pipe surface, with the cross-section of the circular lines perpendicular to the axis of the pipe.

[0004] The existing marking devices for titanium alloy pipes mainly have the following technical problems: 1. Insufficient precision in adjusting the position of the scribing head, resulting in poor consistency in scribing depth: The position adjustment of the scribing head in existing equipment relies heavily on manual operation, lacking precise displacement measurement and pressure detection methods. This makes it difficult to accurately control the contact pressure between the scribing head and the pipe surface, leading to uneven scribing depth and unstable scribing quality.

[0005] 2. Limited marking functionality and inability to quickly switch marking modes: Existing marking equipment typically has a fixed marking head, capable of marking only a single type of line. When different forms or quantities of lines need to be marked on the pipe surface, the marking head must be replaced or the tooling manually adjusted, which is cumbersome, time-consuming, and cannot meet diverse marking needs. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, this invention provides a scribing device for measuring the shrinkage strain ratio of titanium alloy pipes, which can solve the problems mentioned in the background art.

[0007] The objective of this invention can be achieved through the following technical solutions: A scribing device for measuring the shrinkage strain ratio of titanium alloy pipes, comprising: An X-axis bearing plate is provided, with a bearing block slidably disposed at the bottom end of the X-axis bearing plate. A hydraulic cylinder is disposed at the bottom end of the X-axis bearing plate, and the output end of the hydraulic cylinder is fixedly connected to the bearing block. A power chuck is disposed at the top end of the X-axis bearing plate. A Y-axis bearing frame is fixedly disposed at the bottom end of the bearing block. A linear drive assembly is disposed inside the Y-axis bearing frame. A sliding seat is disposed at each of the two output ends of the linear drive assembly. The two sliding seats are symmetrically distributed about the bearing block. The top end of the sliding seat is slidably connected to the assembly seat through a guide rail assembly. A locking element is threadedly connected to the bottom wall of the groove in the vertical section of the assembly seat. A micrometer head body is disposed at the top end of the sliding seat for adjusting the distance from the assembly seat to the central axis of the titanium alloy tube. An elastic telescopic limiting mechanism is installed at the top of the X-axis bearing plate; The switchable scribing structure has an assembly groove at the top of the assembly base, and the switchable scribing structure is disposed in the assembly groove of the assembly base.

[0008] Preferably, the bottom end of the X-axis bearing plate is provided with two limiting rails, and the top end of the bearing block is provided with a guide groove that slides with the limiting rails.

[0009] Preferably, the power chuck includes a three-jaw chuck and a power unit that drives its rotation for fixing and rotating the titanium alloy tube.

[0010] Preferably, the locking component includes a trapezoidal screw portion and a handle portion, wherein the handle portion is provided with an anti-slip layer.

[0011] Preferably, the elastic telescopic limiting mechanism includes a support plate, an annular plate, and a limiting cone coaxially arranged with the power chuck. The support plate is disposed at the top of the bearing plate along the X-axis. A plurality of T-shaped rods are disposed at the end of the annular plate near the support plate. The T-shaped rods are slidably connected to the support plate through the annular plate. A plurality of springs are disposed between the annular plate and the support plate. The springs are sleeved with adjacent T-shaped rods. A bracket is rotatably mounted on the inner wall of the annular plate through a bearing. The limiting cone is fixedly installed at the end of the bracket away from the support plate.

[0012] Preferably, the linear drive assembly includes a trapezoidal lead screw, which is rotatably mounted between two vertical sections of the Y-axis bearing frame. The trapezoidal lead screw is threadedly connected to a sliding seat. A servo motor is provided on one outer wall of the trapezoidal lead screw. The output shaft of the servo motor is fixedly connected to the shaft end of the trapezoidal lead screw via a coupling. Two limiting rods are rotatably mounted between the two vertical sections of the Y-axis bearing frame, and the limiting rods are slidably connected to the sliding seat.

[0013] Preferably, the bearing block has a through hole along the Y direction, which matches the trapezoidal lead screw.

[0014] Preferably, the trapezoidal lead screw shaft is provided with trapezoidal threaded bodies with the same pitch at both ends and opposite directions of rotation, and the two sliding seats are respectively matched with the adjacent trapezoidal threaded bodies.

[0015] Preferably, the switchable scribing structure includes a pressure plate, a U-shaped plate, and a first scribing head disposed on the side of the pressure plate near the titanium alloy tube. The first scribing head is slidably connected to the assembly groove wall of the assembly base. A pressure sensor is disposed between the side of the pressure plate away from the first scribing head and the assembly groove wall. The U-shaped plate is located on the side of the pressure plate away from the titanium alloy tube. Two second scribing heads are disposed on the side of the U-shaped plate near the pressure plate. The second scribing heads are slidably connected to the pressure plate. A self-locking electric push rod is disposed on one side of the assembly base. The top end of the push rod of the self-locking electric push rod is fixedly connected to the side of the U-shaped plate away from the pressure plate.

[0016] Preferably, when the self-locking electric push rod extends to the first position, the two second scribing heads pass through the pressure plate and their working end faces are flush with the working end face of the first scribing head, achieving simultaneous scribing of three heads; when the self-locking electric push rod retracts to the second position, the working end faces of the two second scribing heads retract into the pressure plate, and only the first scribing head extends to work, achieving single-head scribing.

[0017] The beneficial effects of this invention are as follows: 1. By setting a linear drive assembly consisting of a trapezoidal lead screw, a servo motor and two limit rods, the trapezoidal lead screw shaft is provided with trapezoidal threaded bodies with the same pitch at both ends and opposite directions of rotation. When the servo motor drives the trapezoidal lead screw to rotate, it drives the two sliding seats to slide synchronously towards or away from each other along the limit rods, so as to realize the synchronous centering adjustment of the two mounting seats and the scribing head in the Y direction. The technical benefits achieved are: rapid centering and positioning of the scribing head for pipes of different diameters without the need to adjust the scribing heads on both sides separately; simple and quick adjustment process; high centering accuracy; effectively shortened changeover time; and improved adaptability and efficiency in processing multi-specification pipes.

[0018] 2. By setting up a switching scribing structure consisting of a pressure plate, a U-shaped plate, a first scribing head, two second scribing heads, and a self-locking electric push rod, when the self-locking electric push rod extends, it pushes the U-shaped plate to move towards the pressure plate. The two second scribing heads pass through the pressure plate so that the working ends of the second scribing heads are flush with the working ends of the first scribing heads, realizing a rapid scribing mode that scribes three equidistant circumferential lines in a single stroke. When the self-locking electric push rod retracts, the second scribing heads retract, and only the first scribing head works, realizing a single-line scribing mode. The technical effect achieved is that it enables quick switching between single-head scribing mode and three-head synchronous scribing mode without the need to replace scribing heads or manually adjust the tooling, thus improving scribing efficiency.

[0019] 3. By setting a pressure sensor, the pressure sensor is set between the side of the pressure plate away from the first scribing head and the assembly groove wall. When the operator rotates the main body of the micro head to drive the assembly seat to move slightly so that the scribing head contacts the surface of the pipe, the pressure sensor detects the contact pressure between the scribing head and the pipe in real time. When the detected pressure value reaches the preset threshold, a prompt signal is issued. The precise setting of the scribing depth is completed in conjunction with the loosening and tightening of the locking parts. The technical effects achieved are: precise control and feedback of the contact pressure between the scribing head and the pipe surface are realized, real-time monitoring and precise control of the scribing pressure are realized, and the consistency of scribing depth and scribing quality are guaranteed. Attached Figure Description

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a diagram showing the installation structure of the X-axis bearing plate and hydraulic cylinder in this invention. Figure 4 This is an installation structure diagram of the elastic telescopic limiting mechanism in this invention; Figure 5 This is an installation structure diagram of the Y-axis bearing frame, sliding seat, assembly seat, and differential head body in this invention; Figure 6 This is a diagram showing the installation structure of the linear drive component in this invention; Figure 7 This is an installation structure diagram of the sliding seat, mounting seat, locking component, and micrometer head body in this invention; Figure 8 This is an exploded view of the switching scribing structure in this invention.

[0022] Explanation of reference numerals in the attached figures: 1. X-axis bearing plate; 2. Bearing block; 3. Hydraulic cylinder; 4. Power chuck; 5. Y-axis bearing frame; 6. Sliding seat; 7. Assembly seat; 8. Locking component; 9. Micrometer head body; 11. Limit rail; 41. Support plate; 42. Annular plate; 43. T-shaped rod; 44. Spring; 45. Hanger; 46. Limiting cone; 51. Trapezoidal lead screw; 52. Servo motor; 53. Limiting rod; 71. Pressure plate; 72. First scribing head; 73. Pressure sensor; 74. U-shaped plate; 75. Second scribing head; 76. Self-locking electric push rod. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this application, it should be understood that the orientation or positional relationship indicated by terms such as "inner" and "outer" are based on the orientation or position shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation, and therefore should not be construed as a limitation of this application.

[0025] Example 1: Reference Figures 1-8 The present invention discloses a scribing device for measuring the shrinkage strain ratio of titanium alloy pipes, comprising: To achieve overall load-bearing and sliding drive along the X-axis, in this embodiment: an X-axis load-bearing plate 1 is provided, a load-bearing block 2 is slidably disposed at the bottom end of the X-axis load-bearing plate 1, two limiting rails 11 are provided at the bottom end of the X-axis load-bearing plate 1, a guide groove is provided at the top end of the load-bearing block 2 that slides with the limiting rails 11, a hydraulic cylinder 3 is provided at the bottom end of the X-axis load-bearing plate 1, the output end of the hydraulic cylinder 3 is fixedly connected to the load-bearing block 2, and a power chuck 4 is provided at the top end of the X-axis load-bearing plate 1. The power chuck 4 includes a three-jaw chuck and a power unit that drives its rotation, used to fix and rotate the titanium alloy tube.

[0026] To achieve Y-axis load bearing and linear drive, in this embodiment: a Y-axis load-bearing frame 5 is fixedly installed at the bottom of the load-bearing block 2, and a linear drive assembly is installed inside the Y-axis load-bearing frame 5. The two output ends of the linear drive assembly are respectively provided with sliding seats 6. The two sliding seats 6 are symmetrically distributed about the load-bearing block 2. The top of the sliding seats 6 is slidably connected to the mounting seat 7 through a guide rail assembly. The bottom wall of the groove in the vertical section of the mounting seat 7 is threaded with a locking member 8. The locking member 8 includes a trapezoidal screw part and a hand-held part. The hand-held part is provided with an anti-slip layer. The top of the sliding seat 6 is provided with a micrometer head body 9, which is used to adjust the distance from the mounting seat 7 to the central axis of the titanium alloy tube.

[0027] To achieve axial elastic limiting and rotational support during pipe processing, in this embodiment: an elastic telescopic limiting mechanism is set at the top of the X-axis bearing plate 1. The elastic telescopic limiting mechanism includes a support plate 41, an annular plate 42, and a limiting cone 46 coaxially arranged with the power chuck 4. The support plate 41 is set at the top of the X-axis bearing plate 1. A plurality of T-shaped rods 43 are set at the end of the annular plate 42 near the support plate 41. The T-shaped rods 43 are connected to the support plate 41 through and in a sliding manner. A plurality of springs 44 are set between the annular plate 42 and the support plate 41. The springs 44 are sleeved with the adjacent T-shaped rods 43. A bracket 45 is rotatably mounted on the inner wall of the annular plate 42 through a bearing. The limiting cone 46 is fixedly installed at the end of the bracket 45 away from the support plate 41.

[0028] To achieve synchronous centering and guidance of the sliding seat 6 in the Y direction, in this embodiment: the linear drive assembly includes a trapezoidal lead screw 51, which is rotatably installed between two vertical sections of the Y-axis bearing frame 5. The trapezoidal lead screw 51 is threadedly connected to the sliding seat 6. The bearing block 2 is provided with a through hole along the Y direction, which matches the trapezoidal lead screw 51. The shaft of the trapezoidal lead screw 51 is provided with trapezoidal threaded bodies with the same pitch at both ends and opposite directions of rotation. The two sliding seats 6 are respectively matched with the adjacent trapezoidal threaded bodies. A servo motor 52 is provided on one outer wall of the trapezoidal lead screw 51. The output shaft of the servo motor 52 is fixedly connected to the shaft end of the trapezoidal lead screw 51 through a coupling. Two limit rods 53 are rotatably installed between the two vertical sections of the Y-axis bearing frame 5, and the limit rods 53 are slidably connected to the sliding seat 6.

[0029] To achieve the switching of the scribing head and real-time monitoring of the scribing pressure, in this embodiment: a switchable scribing structure is provided with an assembly groove at the top of the assembly base 7. The switchable scribing structure is set in the assembly groove of the assembly base 7. The switchable scribing structure includes a pressure plate 71, a U-shaped plate 74, and a first scribing head 72 set on the side of the pressure plate 71 near the titanium alloy tube. The first scribing head 72 is connected to the wall of the assembly groove of the assembly base 7 through and slidingly. A pressure sensor 73 is set between the side of the pressure plate 71 away from the first scribing head 72 and the wall of the assembly groove. The U-shaped plate 74 is located on the side of the pressure plate 71 away from the titanium alloy tube. Two second scribing heads 75 are set on the side of the U-shaped plate 74 near the pressure plate 71. The second scribing heads 75 are connected to the pressure plate 71 through and slidingly. A self-locking electric push rod 76 is set on one side of the assembly base 7. The top of the push rod of the self-locking electric push rod 76 is fixedly connected to the side of the U-shaped plate 74 away from the pressure plate 71.

[0030] In this embodiment, a PLC controller is also provided. The PLC controller is electrically connected to the rotary power unit of the hydraulic cylinder 3, the power chuck 4, the servo motor 52, the self-locking electric push rod 76, and the pressure sensor 73. The PLC controller has a built-in programmable control program for coordinating the actions of each component according to a preset timing sequence.

[0031] The specific control logic is as follows: First, the PLC controller sends a drive command to the servo motor 52 based on the outer diameter parameters of the titanium alloy pipe to be processed. The servo motor 52 drives the trapezoidal lead screw 51 to rotate, causing the two sliding seats 6 to move synchronously to the preset position and then stop. Subsequently, the PLC controller receives the pressure signal fed back by the pressure sensor 73. When the operator rotates the micrometer head body 9 to make the first scribing head 72 contact the surface of the pipe, the pressure sensor 73 detects the contact pressure in real time and transmits the signal to the PLC controller. The PLC controller compares the detected pressure value with the preset pressure threshold. When the detected pressure value reaches the preset threshold, the PLC controller issues a prompt signal, such as an indicator light illuminating or a buzzer alarm, reminding the operator to stop feeding and tighten the locking part 8.

[0032] The working principle and usage process of this invention are as follows: One end of the titanium alloy pipe to be processed is clamped and fixed by the three-jaw chuck of the power chuck 4, and the other end is axially limited by the limiting cone 46. The hydraulic cylinder 3 drives the bearing block 2 to reciprocate along the limiting rail 11 in the X-axis, realizing the feeding movement of the scribing head along the axial direction of the pipe. The power chuck 4 drives the titanium alloy pipe to rotate around its central axis, cooperating with the scribing head to complete the circumferential scribing of the outer circle of the pipe.

[0033] The servo motor 52 inside the Y-axis support frame 5 drives the trapezoidal lead screw 51 to rotate. The trapezoidal threads at both ends of the lead screw 51, with the same pitch but opposite directions, drive the two sliding seats 6 to slide synchronously towards or away from each other along the limiting rod 53. This causes the two mounting seats 7 and the scribing head to initially move to a preset position that matches the outer diameter of the titanium alloy tube to be processed. After sliding into position, the servo motor 52 stops, and the positions of the two sliding seats 6 are locked. Subsequently, the operator loosens the locking piece 8, releasing the locking state between the mounting seat 7 and the sliding seat 6, and rotates the micrometer head body 9, driving the mounting seat 7 to move slightly relative to the sliding seat 6, so that the first scribing head 72 gradually approaches the surface of the titanium alloy tube. After the first scribing head 72 contacts the tube surface, it continues to feed slightly. The pressure sensor 73 detects the contact pressure between the scribing head and the tube in real time. When the pressure value reaches the preset value, the operator stops rotating the micrometer head body 9 and tightens the locking piece 8, relocking the mounting seat 7 onto the sliding seat 6, thus completing the precise setting of the scribing depth.

[0034] During the marking process, the spring 44 of the elastic telescopic limiting mechanism pushes the annular plate 42 through the T-shaped rod 43, so that the limiting cone 46 always maintains elastic contact with the end of the pipe. At the same time, the bracket 45 rotates synchronously with the pipe to reduce friction.

[0035] The switchable scribing structure can perform two working modes. When circumferential equidistant scribing is required, the self-locking electric push rod 76 extends, pushing the U-shaped plate 74 towards the pressure plate 71 until the working end of the second scribing head 75 is flush with the working end of the first scribing head 72, that is, the two second scribing heads 75 are located on both sides of the first scribing head 72 and the working ends of the three are coplanar. At this time, the power chuck 4 drives the titanium alloy tube to rotate, and the first scribing head 72 and the two second scribing heads 75 work synchronously to scribble three equidistant circumferential lines on the outer circle of the tube at the same time.

[0036] Then, the axial parallel marking mode is entered. The self-locking electric push rod 76 retracts slightly, causing the second marking head 75 to move back, leaving only the first marking head 72 in contact with the pipe surface. The hydraulic cylinder 3 drives the bearing block 2 to move along the X-axis, and the first marking head 72 marks a line parallel to the pipe axis on the pipe surface. After completing the first axial marking, the power chuck 4 drives the titanium alloy pipe to rotate 90 degrees, 180 degrees, and 270 degrees in sequence. After each rotation, the hydraulic cylinder 3 again drives the bearing block 2 to move along the X-axis, and the first marking head 72 marks the corresponding axial parallel marking on the pipe surface, ultimately forming four evenly spaced and axially parallel markings on the circumference of the pipe.

[0037] Through the aforementioned collaborative work, the device achieves precise marking of three equidistant circumferential lines and four evenly distributed axial parallel lines on titanium alloy pipes.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A scribing device for measuring the shrinkage strain ratio of titanium alloy pipes, characterized in that, include: X-axis bearing plate (1), bearing block (2) is slidably arranged at the bottom end of the X-axis bearing plate (1), hydraulic cylinder (3) is arranged at the bottom end of the X-axis bearing plate (1), the output end of the hydraulic cylinder (3) is fixedly connected to the bearing block (2), power chuck (4) is arranged at the top end of the X-axis bearing plate (1), Y-axis bearing frame (5) is fixedly arranged at the bottom end of the bearing block (2), linear drive assembly is arranged inside the Y-axis bearing frame (5), sliding seats (6) are arranged at the two output ends of the linear drive assembly, the two sliding seats (6) are symmetrically distributed about the bearing block (2), the top end of the sliding seat (6) is slidably connected to the assembly seat (7) through the guide rail assembly, locking part (8) is threadedly connected to the bottom wall of the groove of the vertical section of the assembly seat (7), and micro head body (9) is arranged at the top end of the sliding seat (6) for adjusting the distance from the assembly seat (7) to the center axis of the titanium alloy tube; An elastic telescopic limiting mechanism is installed at the top of the X-axis bearing plate (1); The switchable scribing structure is provided with an assembly groove at the top of the assembly base (7), and the switchable scribing structure is provided in the assembly groove of the assembly base (7).

2. The scribing device for measuring the shrinkage strain ratio of titanium alloy pipes according to claim 1, characterized in that, The bottom end of the X-axis bearing plate (1) is provided with two limiting rails (11), and the top end of the bearing block (2) is provided with a guide groove that slides with the limiting rails (11).

3. The scribing device for measuring the shrinkage strain ratio of titanium alloy pipes according to claim 1, characterized in that, The power chuck (4) includes a three-jaw chuck and a power unit that drives its rotation for fixing and rotating titanium alloy tubing.

4. The scribing device for measuring the shrinkage strain ratio of titanium alloy pipes according to claim 1, characterized in that, The locking component (8) includes a trapezoidal screw part and a handle part, wherein the handle part is provided with an anti-slip layer.

5. A scribing device for measuring the shrinkage strain ratio of titanium alloy pipes according to claim 1, characterized in that, The elastic telescopic limiting mechanism includes a support plate (41), an annular plate (42), and a limiting cone (46) coaxially arranged with the power chuck (4). The support plate (41) is located at the top of the bearing plate (1) in the X-axis direction. The annular plate (42) is provided with a plurality of T-shaped rods (43) at one end near the support plate (41). The T-shaped rods (43) are connected to the support plate (41) through and slidingly. A plurality of springs (44) are provided between the annular plate (42) and the support plate (41). The springs (44) are sleeved with the adjacent T-shaped rods (43). A bracket (45) is rotatably mounted on the inner wall of the annular plate (42) through a bearing. The limiting cone (46) is fixedly installed at the end of the bracket (45) away from the support plate (41).

6. A scribing device for measuring the shrinkage strain ratio of titanium alloy pipes according to claim 1, characterized in that, The linear drive assembly includes a trapezoidal lead screw (51), which is rotatably mounted between two vertical sections of the Y-axis bearing frame (5). The trapezoidal lead screw (51) is threadedly connected to the sliding seat (6). A servo motor (52) is provided on one outer wall of the trapezoidal lead screw (51). The output shaft of the servo motor (52) is fixedly connected to the shaft end of the trapezoidal lead screw (51) through a coupling. Two limit rods (53) are rotatably mounted between the two vertical sections of the Y-axis bearing frame (5). The limit rods (53) are slidably connected to the sliding seat (6).

7. A scribing device for measuring the shrinkage strain ratio of titanium alloy pipes according to claim 6, characterized in that, The bearing block (2) has a through hole along the Y direction, which matches the trapezoidal lead screw (51).

8. A scribing device for measuring the shrinkage strain ratio of titanium alloy pipes according to claim 6, characterized in that, The trapezoidal screw (51) shaft is provided with trapezoidal threaded bodies with the same pitch at both ends and opposite directions of rotation, and the two sliding seats (6) are respectively matched with the adjacent trapezoidal threaded bodies.

9. A scribing device for measuring the shrinkage strain ratio of titanium alloy pipes according to claim 1, characterized in that, The switching scribing structure includes a pressure plate (71), a U-shaped plate (74), and a first scribing head (72) disposed on the side of the pressure plate (71) near the titanium alloy pipe. The first scribing head (72) is slidably connected to the assembly groove wall of the assembly seat (7). A pressure sensor (73) is disposed between the side of the pressure plate (71) away from the first scribing head (72) and the assembly groove wall. The U-shaped plate (74) is located on the side of the pressure plate (71) away from the titanium alloy pipe. Two second scribing heads (75) are disposed on the side of the U-shaped plate (74) near the pressure plate (71). The second scribing heads (75) are slidably connected to the pressure plate (71). A self-locking electric push rod (76) is disposed on one side of the assembly seat (7). The top of the push rod of the self-locking electric push rod (76) is fixedly connected to the side of the U-shaped plate (74) away from the pressure plate (71).

10. A scribing device for measuring the shrinkage strain ratio of titanium alloy pipes according to claim 9, characterized in that, When the self-locking electric push rod (76) extends to the first position, the two second scribing heads (75) pass through the pressure plate (71) and their working end faces are flush with the working end face of the first scribing head (72), realizing three-head synchronous scribing; when the self-locking electric push rod (76) retracts to the second position, the working end faces of the two second scribing heads (75) retract into the pressure plate (71), and only the first scribing head (72) extends out to work, realizing single-head scribing.

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