A round bar sample marking and division method and device

Abstract

The present invention discloses a round bar sample marking and division method and device, including marking and positioning the round bar sample; detecting the surface roughness of the gauge section to obtain a roughness value Rz; performing ink spraying at a preset marking point on the gauge section surface to obtain an ink marking line with a preset ink line width and a preset ink spraying thickness; performing marking etching along the ink marking line to obtain an etching marking line with a preset etching line width and a preset etching depth, wherein the preset etching line width is less than half of the preset ink line width, and the preset etching depth is less than or equal to the sum of the preset ink spraying thickness and Rz / 2. The present invention detects the surface roughness of the gauge section of the round bar sample before ink spraying, and adopts the operation sequence of first spraying ink to protect the surface of the round bar sample and then laser etching the marking line, which greatly protects the sample surface, realizes almost non-destructive marking, and greatly improves the stability and reliability of the test data. The present invention relates to the technical field of deep cold mechanical property testing of metal materials.

Description

Technical Field

[0001] The invention relates to the technical field of deep-cold mechanical property testing of metal materials, and in particular to a round bar sample marking and dividing method and device. Background Art

[0002] Austenitic stainless steel is a common material for manufacturing cryogenic containers, and the thickness of the plate used is generally 4 to 24 mm. Therefore, when conducting mechanical property tests on cryogenic materials, round bar specimens are often selected for cryogenic tensile and cryogenic fatigue tests due to their advantages such as convenient material processing, high test stability, and small data deviation. In order to obtain the performance parameters before and after the test, it is often necessary to mark the surface of the specimen. Due to the high processing accuracy requirements of round bar specimens and the extremely low temperature test environment (often below -150°C), very stringent requirements are placed on the division accuracy, integrity, repeatability, etc. of the specimen markings.

[0003] However, the existing sample marking scheme is very easy to be affected by liquid level fluctuations and become blurred, making it difficult to identify. It is also very easy to damage the surface processing quality, which directly affects the accuracy of the mechanical performance test results. Summary of the invention

[0004] The object of the present invention is to provide a round bar sample marking and dividing method and device, which greatly protects the sample surface, realizes almost non-destructive marking, and greatly improves the stability and reliability of test data.

[0005] The technical solutions adopted to solve the above technical problems are:

[0006] A round bar sample marking and dividing method according to the first aspect of an embodiment of the present invention is applied to a round bar sample marking and dividing device having an automatic clamping system, a marking positioning system, a surface quality detection system, a high-definition inkjet system and an adjustable laser etching system, wherein the automatic clamping system is used to position and clamp the round bar sample, the marking positioning system is used to position and determine the gauge length section of the round bar sample, the surface quality detection system is used to detect the surface roughness of the round bar sample, the high-definition inkjet system is used to print ink on the surface of the round bar sample, and the adjustable laser etching system is used to mark and etch the surface of the round bar sample;

[0007] The round bar sample marking and division method comprises:

[0008] Positioning and clamping the round bar sample;

[0009] Marking and positioning the round bar sample to obtain a gauge length segment on the round bar sample;

[0010] Detecting the surface roughness of the gauge length section to obtain a roughness value Rz;

[0011] Ink is sprayed at at least one preset marking point on the surface of the gauge section to obtain an ink marking line with a preset ink line width and a preset ink spraying thickness;

[0012] Mark etching is performed along the ink marking line to obtain an etched marking line with a preset etching line width and a preset etching depth, wherein the preset etching line width is less than half of the preset ink line width, and the preset etching depth is less than or equal to the sum of the preset ink spraying thickness and Rz / 2.

[0013] The round bar sample marking and division method of the present invention has the following beneficial effects:

[0014] Before ink spraying, the present invention first detects the surface roughness of the gauge section of the round rod sample, which lays a foundation for high-precision and non-destructive marking line division. The operation sequence of first spraying ink to protect the surface of the round rod sample and then laser etching the marking line is adopted, and the preset etching line width is limited to be less than half of the preset ink line width, and the preset etching depth is less than or equal to the sum of the preset ink spraying thickness and the roughness value Rz / 2, which greatly protects the sample surface, realizes almost non-destructive marking, and greatly improves the stability and reliability of the test data. The ink spraying and laser etching used in the division and marking process are both non-contact processing, and do not introduce prestress (bending moment) and deformation, which greatly guarantees the accuracy of the test data obtained from the round rod sample.

[0015] As a further improvement of the above technical solution, the surface quality detection system is provided with a roughness measuring head for measuring the surface concave-convex height of the round bar sample;

[0016] The detecting the surface roughness of the gauge section to obtain a roughness value Rz comprises:

[0017] placing the roughness measuring head in contact with the surface of the gauge section;

[0018] Control the roughness measuring head to move from one end of the gauge section to the other end along the axial direction of the round rod sample, record the maximum and minimum values ​​of the measurement data, and calculate the difference Rz1 between the maximum and minimum values;

[0019] The roughness measuring head is controlled to contact different circumferential positions of the surface of the gauge section, and Rz2, Rz3, ..., Rz are measured and calculated in sequence. n ;

[0020] For Rz1, Rz2, Rz3... Rz n An average calculation was performed to obtain the Rz.

[0021] As a further improvement of the above technical solution, the high-definition inkjet system is provided with a high-precision nozzle;

[0022] The ink spraying is performed on at least one preset marking point on the surface of the gauge section, comprising:

[0023] Controlling the round rod sample to rotate around its own axis;

[0024] The high-precision nozzle sprays ink in a full circumferential direction on the round rod sample at the preset marking point to obtain a full circumferential ink marking line.

[0025] As a further improvement of the above technical solution, the high-precision nozzle is used to spray the round rod sample with ink in a full circumferential direction at the preset marking point to obtain a full circumferential ink marking line, including:

[0026] Adjusting the spraying rotation speed of the round rod sample or the flow rate and velocity of the ink supply according to the preset ink spraying thickness;

[0027] The nozzle size of the high-precision nozzle is adjusted according to the preset ink line width.

[0028] As a further improvement of the above technical solution, the adjustable laser etching system has a laser head;

[0029] The step of performing marking etching along the ink marking line comprises:

[0030] Controlling the round rod sample to rotate around its own axis;

[0031] The laser head is used to perform full circumferential marking etching on the ink marking line.

[0032] As a further improvement of the above technical solution, the marking positioning system is provided with two coaxial measuring heads spaced apart along the axial direction of the round rod sample, and the two coaxial measuring heads are capable of axial movement and circumferential rotation;

[0033] The marking and positioning of the round bar sample comprises:

[0034] Adjusting the positions of the two coaxial measuring heads to be near the gauge length section;

[0035] The two coaxial measuring heads are axially moved according to the preset gauge length so that the positions of the two coaxial measuring heads completely correspond to the estimated gauge length positions of the round bar sample, and the positions of the two coaxial measuring heads are fixed.

[0036] As a further improvement of the above technical solution, the automatic clamping system is provided with an automatic self-centering clamping head and a pre-tightening head which are arranged relatively spaced along the axial direction of the round bar sample, and the automatic self-centering clamping head and the pre-tightening head can move axially and rotate circumferentially;

[0037] The positioning and clamping of the round bar sample comprises:

[0038] One end of the round bar sample is clamped by the automatic self-centering chuck, and the other end is fixed by coaxially applying a preset axial preload force to the round bar sample through a preload head.

[0039] According to a second aspect of an embodiment of the present invention, a round bar sample marking and dividing device has mutually orthogonal X-axis, Y-axis and Z-axis directions, and the round bar sample marking and dividing method and device include:

[0040] An automatic clamping system is provided with an automatic self-centering clamping head and a pre-tightening head which are arranged relatively spaced apart along the X-axis direction, and the automatic self-centering clamping head and the pre-tightening head can move axially and rotate circumferentially along the X-axis direction;

[0041] The marking positioning system is provided with two coaxial measuring heads and a spacing measuring assembly, wherein the two coaxial measuring heads are arranged at intervals along the X-axis direction beside the automatic self-centering chuck and the preload head, and the spacing measuring assembly is used to measure the distance between the two coaxial measuring heads;

[0042] The surface quality detection system is provided with a roughness measuring head and a surface roughness detection and digital display component which are connected to each other, wherein the roughness measuring head is used to measure the surface concave-convex height of the round bar sample, and the surface roughness detection and digital display component is used to process and display the surface roughness data of the round bar sample;

[0043] A high-definition inkjet system, comprising a high-precision nozzle and an ink supply control assembly connected to each other, wherein the nozzle size of the high-precision nozzle is adjustable to achieve the printing of marks of different thicknesses, and the ink supply control assembly is used to achieve the supply of ink;

[0044] The adjustable laser etching system is provided with a laser head and a laser generating and regulating component connected to each other.

[0045] As a further improvement of the above technical solution, it also includes a fast automatic switching system, which has three workstations, and the surface quality detection system, the high-definition inkjet system and the adjustable laser etching system are respectively arranged on the three workstations, and the three workstations are divided into a current working station, a first preparatory station and a second preparatory station. The fast automatic switching system is configured to switch the workstations of the surface quality detection system, the high-definition inkjet system and the high-definition inkjet system, and the measurement position of the surface quality detection system, the spraying point position of the high-definition inkjet system and the etching position of the adjustable laser etching system when located at the current working station are all at the same position.

[0046] As a further improvement of the above technical solution, it also includes a moving system, the fast automatic switching system support is installed on the moving system, and the moving system is configured to control the fast automatic switching system to move in the X-axis, Y-axis and Z-axis directions.

[0047] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

[0049] Figure 1 This is a flowchart of the steps of one embodiment of the round bar sample marking and dividing method provided by the present invention;

[0050] Figure 2 This is a front view of an embodiment of the round bar sample marking and dividing device provided by the present invention;

[0051] Figure 3 This is a top view of an embodiment of the round bar sample marking and dividing device provided by the present invention;

[0052] Figure 4 yes Figure 2 Side view of the middle AA section;

[0053] Figure Number:

[0054] Automatic clamping system 100; automatic self-centering clamping head 110; preload head 120;

[0055] Marking positioning system 200; coaxial measuring head 210; scale 220; automatic measuring display 230;

[0056] Surface quality detection system 300; roughness measuring head 310; surface roughness detection and digital display component 320;

[0057] High-definition inkjet system 400; high-precision nozzle 410; ink supply control component 420;

[0058] Adjustable laser etching system 500; laser head 510; laser generation and regulation component 520;

[0059] Machine base 600;

[0060] Rapid automatic switching system 700; current working station 710; first preparation station 720; second preparation station 730;

[0061] Mobile system 800;

[0062] Round bar specimen 900. DETAILED DESCRIPTION

[0063] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0064] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0065] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0066] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0067] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments.

[0068] Austenitic stainless steel (such as S30408) is widely used in the manufacture of cryogenic containers because of its good plasticity, toughness and corrosion resistance at low temperatures. When designing existing cryogenic containers, calculations are still based on the mechanical properties of the material at room temperature, without considering the impact of ambient temperature on material properties. For S30408, the material strength is significantly improved at low temperatures (such as -196°C), and if this effect is not considered during design, it will cause a huge waste of materials. Therefore, it is of great engineering significance to carry out extensive cryogenic mechanical property tests and fully accumulate material mechanical property data under cryogenic conditions in order to fully utilize materials, improve the design and manufacturing level of cryogenic containers and product competitiveness, and reduce energy consumption and carbon emissions during manufacturing and use.

[0069] Austenitic stainless steel is a common material for manufacturing cryogenic containers, and the thickness of the plate used is generally 4~24mm. Therefore, when conducting mechanical property tests on cryogenic materials, round bar specimen 900 is often selected for cryogenic tensile and cryogenic fatigue tests due to its advantages such as convenient material processing, high test stability, and small data deviation. In order to obtain the performance parameters before and after the test, it is often necessary to mark the surface of the specimen. Due to the high processing accuracy requirements of the round bar specimen 900 and the extremely low temperature test environment (often below -150℃), very demanding requirements are placed on the division accuracy, integrity, repeatability, etc. of the specimen marking. However, the currently commonly used tensile specimen marking devices and methods have many limitations in their applicability to the round bar specimen 900 for cryogenic testing.

[0070] The first method uses the method of damaging the sample surface for marking. This method uses a knife to mark lines or an elastic punch to mark points to divide the gauge length. Although the marking scratches are clear, they often damage the sample surface and destroy the integrity of the sample. For example, the surface roughness requirement of the parallel section of the round bar tensile specimen is generally Ra0.8 or Ra1.6, while the surface roughness processing requirement of the parallel section of the round bar fatigue specimen is even higher than Ra0.2. Once the marking scratches damage the sample surface, it is very easy to cause the sample to break at the marking, which seriously affects the accuracy of the test results, and also wastes test materials and time.

[0071] Another method is to directly use ink or other ink to divide the gauge length. Although it does not damage the surface, the marking line is relatively thick, the edge is blurred, and the marking accuracy is not high. Secondly, after the test material is deformed in a deep cold environment, the surface ink or ink is easy to fall off, making the marking difficult to identify, which is not very practical. Especially when the sample is immersed in a low-temperature medium such as liquid nitrogen during a low-temperature test, the marking is easily affected by the fluctuation of the liquid level and becomes blurred, making it difficult to identify.

[0072] On the other hand, with regard to the determination of the gauge interval, existing disclosed devices and methods often use mold spacing or the number of rotations of a crank (which drives the lead screw to move) to determine the distance between marks. This method is prone to uneven marking intervals due to the single gauge size or gaps in the mechanical structure, thereby affecting the accuracy and effectiveness of the test results.

[0073] In summary, there are still many limitations in the current marking and dividing device and method for austenitic stainless steel round bar specimens used for cryogenic mechanical properties testing.

[0074] The present invention proposes a round bar sample marking and division method, such as Figures 2 to 4 As shown, the round rod sample marking and dividing method of this embodiment is applied to a round rod sample marking and dividing device having an automatic clamping system 100, a marking positioning system 200, a surface quality detection system 300, a high-definition inkjet system 400 and an adjustable laser etching system 500.

[0075] The automatic clamping system 100 is used to position and clamp the round rod sample 900, the marking and positioning system 200 is used to determine the gauge position and size of the round rod sample 900, the surface quality detection system 300 is used to detect the surface roughness of the round rod sample 900, the high-definition inkjet system 400 is used to print ink on the surface of the round rod sample 900, and the adjustable laser etching system 500 is used to mark and etch the surface of the round rod sample 900.

[0076] like Figure 1 As shown in the figure, the round bar specimen marking and division method includes:

[0077] Step S100: positioning and clamping the round bar sample 900;

[0078] Step S200: marking and positioning the round bar sample 900 to obtain a gauge length segment on the round bar sample 900;

[0079] Step S300: Detecting the surface roughness of the gauge section to obtain a roughness value Rz;

[0080] Step S400: performing ink spraying at at least one preset marking point on the surface of the gauge section to obtain an ink marking line with a preset ink line width and a preset ink spraying thickness;

[0081] Step S500: performing marking etching along the ink marking line to obtain an etching marking line with a preset etching line width and a preset etching depth, wherein the preset etching line width is less than half of the preset ink line width, and the preset etching depth is less than or equal to the sum of the preset ink spraying thickness and Rz / 2.

[0082] Before ink spraying, the present invention first detects the surface roughness of the gauge section of the round rod sample 900, which lays a foundation for high-precision and non-destructive marking line division. The operation sequence of first spraying ink to protect the surface of the round rod sample 900 and then laser etching the marking line is adopted, and the preset etching line width is limited to be less than half of the preset ink line width, and the preset etching depth is less than or equal to the sum of the preset ink spraying thickness and the roughness value Rz / 2. This greatly protects the sample surface, achieves almost non-destructive marking, and greatly improves the stability and reliability of the test data. The ink spraying and laser etching used in the division and marking process are both non-contact processing, and do not introduce prestress (bending moment) and deformation, which greatly ensures the accuracy of the test data obtained from the round rod sample 900.

[0083] like Figure 2 and Figure 3 As shown, the automatic clamping system 100 of this embodiment is provided with an automatic self-centering chuck 110 and a pre-tightening head 120 which are arranged relatively to each other along the axial direction of the round rod sample 900. The automatic self-centering chuck 110 and the pre-tightening head 120 can move axially and rotate circumferentially along the axial direction of the round rod sample 900.

[0084] Step S100 of this embodiment includes:

[0085] One end of the round bar sample 900 is clamped by the automatic self-centering chuck 110 , and the other end is fixed by coaxially applying a preset axial preload force to the round bar sample 900 through the preload head 120 .

[0086] After installation, the automatic self-centering chuck 110 is rotated to drive the round bar sample 900 to rotate. At the same time, the preload force of the automatic self-centering chuck 110 and the axial preload force of the preload head 120 are checked and adjusted to ensure that the round bar sample 900 is not deformed or loosened during the rotation process.

[0087] like Figure 2 and Figure 3 As shown, the marking and positioning system 200 of this embodiment is provided with two coaxial measuring heads 210 spaced apart along the axial direction of the round rod sample 900 , and the two coaxial measuring heads 210 can move axially and rotate circumferentially along the axial direction of the round rod sample 900 .

[0088] Step S200 of this embodiment includes:

[0089] Step S210: adjusting the positions of the two coaxial measuring heads 210 to be close to the gauge length section;

[0090] Step S220 : axially moving the two coaxial measuring heads 210 according to the preset gauge length, so that the positions of the two coaxial measuring heads 210 completely correspond to the estimated gauge length positions of the round bar sample 900 , and fixing the positions of the two coaxial measuring heads 210 .

[0091] During operation, the coaxial measuring heads 210 are moved axially and rotated circumferentially to the vicinity of the gauge section of the round rod sample 900, and the two coaxial measuring heads 210 are moved so that the distance between the two coaxial measuring heads 210 is the preset gauge length. The two coaxial measuring heads 210 are slightly moved axially and rotated circumferentially so that the positions of the two measuring heads completely correspond to the expected gauge length positions of the round rod sample 900, and then the two coaxial measuring heads 210 are fixed. At this time, the distance between the two coaxial measuring heads 210 is the gauge length Lc of the round rod sample 900.

[0092] like Figure 4 As shown, the surface quality detection system 300 of this embodiment is provided with a roughness measuring head 310 for measuring the surface concave-convex height of a round bar sample 900;

[0093] Step S300 of this embodiment includes:

[0094] Step S310: bringing the roughness measuring head 310 into contact with the surface of the gauge section;

[0095] Step S320: Control the roughness measuring head 310 to move from one end of the gauge section to the other end along the axial direction of the round rod sample 900, record the maximum and minimum values ​​of the measurement data, and calculate the difference Rz1 between the maximum and minimum values;

[0096] Step S330: Control the roughness measuring head 310 to contact different circumferential positions of the surface of the gauge segment, and sequentially measure and calculate Rz2, Rz3, ..., Rz n ;

[0097] Step S340: Rz1, Rz2, Rz3, ... Rz n The average calculation was performed to obtain Rz.

[0098] In step S320 and step S330, the roughness measuring head 310 is controlled to contact the surface of the gauge section and correspond to the positioning position of any coaxial measuring head 210, and the roughness measuring head 310 is adjusted to move axially along the round rod sample 900 to the positioning position of another coaxial measuring head 210, and the maximum and minimum values ​​of the surface unevenness height of the round rod sample 900 in this process are recorded, and the difference between the maximum and minimum values ​​is calculated.

[0099] In step S330, the automatic self-centering chuck 110 is adjusted to drive the round bar sample 900 to rotate in situ at an appropriate angle, so that the roughness measurement head 310 contacts different circumferential positions of the gauge section surface, and the surface detection operation of the round bar sample 900 is repeated.

[0100] like Figure 4 As shown, the high-definition inkjet system 400 of this embodiment is provided with a high-precision nozzle 410, through which ink is sprayed.

[0101] Step S400 of this embodiment includes:

[0102] Step S410: controlling the round rod sample 900 to rotate around its own axis;

[0103] Step S420: The round rod sample 900 is subjected to full circumferential ink spraying at preset marking points by means of the high-precision nozzle 410 to obtain a full circumferential ink marking line.

[0104] In step S410 , the round bar sample 900 is driven to rotate in situ by the automatic self-centering chuck 110 .

[0105] Step S420 of this embodiment includes:

[0106] Step S421: adjusting the spraying rotation speed of the round rod sample 900 or the flow rate and velocity of the ink supply according to the preset ink spraying thickness;

[0107] Step S422: adjusting the nozzle size of the high-precision nozzle 410 according to the preset ink line width.

[0108] In this embodiment, the width of the ink line sprayed by the high-precision nozzle 410 is set, and the height of the sprayed ink line is adjusted by adjusting the speed of the automatic self-centering chuck 110 to drive the round rod sample 900 to rotate in situ, until the round rod sample 900 is sprayed with ink in an all-round manner at the spraying position. Subsequently, the high-precision nozzle 410 can be adjusted to move axially along the round rod sample 900 to achieve the spraying of the all-round ink marking line at the marking points within the entire gauge section length Lc of the round rod sample 900. The specific positions and number of the ink marking lines can be determined by the actual test requirements.

[0109] like Figure 4 As shown, the adjustable laser etching system 500 of this embodiment is provided with a laser head 510;

[0110] Step S500 of this embodiment includes:

[0111] Step S510: controlling the round rod sample 900 to rotate around its own axis;

[0112] Step S520: Use the laser head 510 to perform full circumferential marking etching on the ink marking line.

[0113] This embodiment adjusts the width of the etched marking line so that the width of the etched marking line is less than half the width of the ink marking line. At the same time, the depth of the etched marking line is adjusted by driving the round rod sample 900 to rotate in situ at a speed automatically driven by the self-centering chuck 110. The maximum etching depth does not exceed the sum of the ink spraying thickness and Rz / 2, so as to achieve marking line division with almost no loss of the surface processing quality of the round rod sample 900. At the same time, through the contrast effect of the ink in the unetched part, the final division mark has the advantages of clear display, high precision, strong repeatability, stable line width and good consistency.

[0114] Subsequently, the laser head 510 is adjusted to move along the axial direction of the round rod sample 900, so that the working position of the laser head 510 moves on the surface of the round rod sample 900, and the movement and marking etching operations are repeated until the marking and etching of all ink marking line positions on the surface of the round rod sample 900 are completed, and all etching mark positions are checked to confirm that the dividing marks are clear and complete in the entire circumferential direction.

[0115] like Figures 2 to 4 As shown, the present invention also proposes a round rod sample marking and dividing device, which has mutually orthogonal X-axis, Y-axis and Z-axis directions, and the round rod sample marking and dividing method and device include: an automatic clamping system 100, a marking positioning system 200, a surface quality detection system 300, a high-definition inkjet system 400, an adjustable laser etching system 500 and a machine base 600.

[0116] Among them, the automatic clamping system 100 is provided with an automatic self-centering chuck 110 and a pre-tightening head 120 which are arranged relatively at intervals along the X-axis direction. The automatic self-centering chuck 110 and the pre-tightening head 120 can move axially and rotate circumferentially along the X-axis direction. The automatic self-centering chuck 110 and the pre-tightening head 120 are respectively installed on the machine base 600 through sliding seats and can be fixed. The automatic self-centering chuck 110 and the pre-tightening head 120 are rotatably arranged relative to the sliding seat. The pre-tightening head 120 adopts a conical head structure. The automatic self-centering chuck 110 can realize the centering clamping of the round rod sample 900, and the distance between the automatic self-centering chuck 110 and the pre-tightening head 120 is adjusted according to the length of the round rod sample 900.

[0117] The automatic clamping system 100 of this embodiment integrates the functions of clamping preload adjustment and in-situ circumferential rotation of the round rod sample 900. The automatic self-centering chuck 110 can automatically clamp and fix one end of the round rod sample 900 and drive the round rod sample 900 to rotate in-situ. At the same time, the clamping force is adjustable, and the rotation direction of the automatic self-centering chuck 110 is kept coaxial with the axial direction of the round rod sample 900 throughout the process; and the preload head 120 realizes the positioning of the other end of the round rod sample 900 and the axial preload of the round rod sample 900 by pushing into the positioning cone hole at the other end of the round rod sample 900. At the same time, the preload force is adjustable, and the automatic self-centering chuck 110 and the preload head 120 always remain coaxial.

[0118] The marking positioning system 200 of this embodiment is provided with two coaxial measuring heads 210 and a spacing measuring assembly. The two coaxial measuring heads 210 are arranged at intervals along the X-axis direction on the sides between the automatic self-centering chuck 110 and the preload head 120. The spacing measuring assembly is used to measure the distance between the two coaxial measuring heads 210.

[0119] The marking and positioning system 200 integrates the functions of the gauge segment positioning, high-precision measurement and display of the round rod specimen 900. The two coaxial measuring heads 210 can realize axial movement and circumferential rotation. One end of the coaxial measuring head 210 is rotatably and slidably mounted on the machine base 600, and the other end of the coaxial measuring head 210 is close to the round rod specimen 900. The coaxial measuring head 210 is rotated circumferentially to adapt to round rod specimens 900 of different outer diameters.

[0120] Among them, the spacing measurement component also includes a ruler 220 and an automatic measurement display 230. The marking positioning system 200 realizes the positioning of the gauge segment of the round rod sample 900 by moving the positions of the two coaxial measuring heads 210, and realizes high-precision measurement and display of the gauge segment of the round rod sample 900 by manually reading the ruler 220 or reading the distance between the two coaxial measuring heads 210 through the automatic measurement display 230.

[0121] The surface quality detection system 300 of this embodiment is provided with a roughness measuring head 310 and a surface roughness detection and digital display component 320 which are interconnected. The roughness measuring head 310 is used to measure the surface unevenness height of the round rod sample 900, and the surface roughness detection and digital display component 320 is used to process and display the surface roughness data of the round rod sample 900. During measurement, the roughness measuring head 310 is brought into contact with the gauge section of the round rod sample 900, and at the same time, the roughness measuring head 310 is controlled to move in a horizontal plane in a direction parallel to the axis of the round rod sample 900, and the surface roughness data of the gauge section of the round rod sample 900 is processed and displayed by the surface roughness detection and digital display component 320.

[0122] The high-definition inkjet system 400 of this embodiment is provided with a high-precision nozzle 410 and an ink supply control component 420 which are interconnected. The nozzle size of the high-precision nozzle 410 is adjusted to achieve the printing of marks of different thicknesses, and the ink supply control component 420 is used to achieve the supply of ink.

[0123] The ink supply control component 420 can realize the supply of inks of different colors and the adjustment of different inkjet imprint heights or thicknesses. When it is necessary to print protective ink, the high-precision nozzle 410 is brought into contact with the gauge section of the round rod sample 900. By adjusting the ink supply control component 420, the ink can be printed on the sample surface for positioning and protecting the sample surface. By controlling the high-precision nozzle 410 to move axially along the round rod sample 900 and controlling the automatic self-centering chuck 110 to rotate the round rod sample 900, full annular ink printing can be achieved at any axial position of the round rod sample 900.

[0124] The adjustable laser etching system 500 of the present embodiment is provided with a laser head 510 and a laser generating and regulating component 520 which are interconnected. The adjustable laser etching system can realize etching of marks of different widths and depths on the surface of the protective ink and the surface of the round rod sample 900. When etching marks are required, the working position of the laser head 510 is moved to the position where marking is required in the gauge section of the round rod sample 900. By adjusting the laser generating and regulating component 520, marks of different widths and depths can be etched on the surface of the protective ink and the surface of the round rod sample 900. By controlling the laser head 510 to move axially along the round rod sample 900 and controlling the automatic self-centering chuck 110 to rotate the round rod sample 900, full circumferential etching of marks at any axial position of the round rod sample 900 can be realized.

[0125] The high-precision measurement and display minimum scale or reading of the marking positioning system 200 of this embodiment is 0.01 mm, the spraying width of the high-precision nozzle 410 of the high-definition inkjet system 400 can be as small as 0.05 mm, and the laser etching width of the adjustable laser etching system 500 can be as small as 0.02 mm.

[0126] Furthermore, if Figures 2 to 4 As shown, this embodiment also includes a fast automatic switching system 700, and the surface quality detection system 300, the high-definition inkjet system 400 and the adjustable laser etching system 500 are installed on the fast automatic switching system 700. This embodiment integrates the surface roughness detection, inkjet and laser etching functions of the round rod sample 900, and switches through the fast automatic switching system 700.

[0127] The fast automatic switching system 700 of this embodiment has three workstations, and the surface quality detection system 300, the high-definition inkjet system 400 and the adjustable laser etching system 500 are respectively arranged on the three workstations, and the three workstations are divided into a current working station 710, a first preparation station 720 and a second preparation station 730, and the fast automatic switching system 700 is provided with a switching and fixing mechanism, and the installation positions of the surface quality detection system 300, the high-definition inkjet system 400 and the adjustable laser etching system 500 at each workstation are switched and fixed by manipulating the switching and fixing mechanism. The three workstations can be switched automatically or manually at will through the switching and fixing mechanism, and the three workstations are always kept parallel and vertically in the same plane. At the same time, no matter which system is switched to the current working station 710, that is, the measurement position of the surface quality measurement system before and after switching or the spraying point of the high-definition inkjet system 400 or the etching position of the adjustable laser etching system 500, the three positions are always kept in the same position.

[0128] When surface inspection is required, the surface quality measurement system is switched to the current work station 710 through the switching and fixing mechanism. When ink spraying is required, the high-definition inkjet system 400 is switched to the current work station 710 through the switching and fixing mechanism. When marking etching is required, the adjustable laser etching system 500 is switched to the current work station 710 through the switching and fixing mechanism, thereby improving the efficiency of the operation.

[0129] In some embodiments, the switching and fixing mechanism may include a rotating disk and a rotating locking structure. The rotating disk is mounted on the outside of the round rod sample 900. The rotating locking structure is used to lock the rotating disk. At the same time, the surface quality detection system 300, the high-definition inkjet system 400 and the adjustable laser etching system 500 can also be locked. The surface quality detection system 300, the high-definition inkjet system 400 and the adjustable laser etching system 500 are installed on the rotating disk in a ring-shaped interval, and the switching of the workstations is achieved by rotating the rotating disk.

[0130] In other embodiments, the switching of workstations may be achieved through other switching structures.

[0131] Furthermore, it also includes a moving system 800, the fast automatic switching system 700 is supported and installed on the moving system 800, the moving system 800 is configured to control the fast automatic switching system 700 to move in the X-axis, Y-axis and Z-axis directions, and the moving system 800 is used to fix and move the fast automatic switching system 700.

[0132] In this embodiment, the roughness measuring head 310, the high-precision nozzle 410, and the laser head 510 are driven by the mobile system 800 to move along the axial direction of the round rod sample 900, so as to realize surface detection, ink spraying, and mark etching at any axial position of the round rod sample 900, and can be adapted to round rod samples 900 of different outer diameters.

[0133] In some implementations, the moving system 800 can automatically support and move the clamping system 100 and the marking and positioning system 200 to drive the round rod sample 900 to move relative to the roughness measurement head 310 , the high-precision nozzle 410 , and the laser head 510 .

[0134] In some implementations, the roughness measurement head 310 , the high-precision nozzle 410 , and the laser head 510 may be driven to rotate in a circular manner relative to the round rod sample 900 .

[0135] In some embodiments, the moving system 800 includes an X-axis moving mechanism, a Y-axis moving mechanism, and a Z-axis moving mechanism, which drive the fast automatic switching system 700 to move in the X-axis, Y-axis, and Z-axis directions.

[0136] Compared with the prior art, the present invention has the following beneficial effects:

[0137] The round bar specimen 900 can be automatically centered, and the round bar specimen 900 is installed without looseness, which reduces the error during marking. At the same time, it can be rotated to achieve full circumferential marking. It can complete point measurement and installation of accessories such as extensometers according to the marked position at different angles, which greatly improves the convenience of subsequent test operations and the traceability of the marked position.

[0138] The integrated high-precision sample processing quality detection function can verify the surface processing quality of the round bar sample 900, screen out the samples that meet the requirements, improve the reliability of the test data, and obtain the in-situ surface roughness data of each marking point, laying the foundation for the division of high-precision and non-destructive marking lines;

[0139] The method of first spraying ink to protect the sample surface and then laser etching the marking line is adopted to greatly protect the sample surface, achieve almost non-destructive marking, and greatly improve the stability and reliability of the test data;

[0140] The laser etching has high precision and a wide adjustable range, which increases the application range of the sample marking device;

[0141] The ink spraying and laser etching used in the division and marking process are both non-contact processing, which does not introduce prestress (bending moment) and deformation, and greatly ensures the accuracy of the test data obtained from the round bar specimen 900;

[0142] The integrity and repeatability of ink spraying and laser etching marking are high, which is convenient for batch marking and improves the repeatability of batch test data.

[0143] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0144] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A round bar sample marking and dividing method, characterized in that: Applicable to a round bar sample marking and dividing device having an automatic clamping system, a marking positioning system, a surface quality detection system, a high-definition inkjet system and an adjustable laser etching system, wherein the automatic clamping system is used to position and clamp the round bar sample, the marking positioning system is used to position and determine the gauge length section of the round bar sample, the surface quality detection system is used to detect the surface roughness of the round bar sample, the high-definition inkjet system is used to print ink on the surface of the round bar sample, and the adjustable laser etching system is used to mark and etch the surface of the round bar sample; The round bar sample marking and division method comprises: Positioning and clamping the round bar sample; Marking and positioning the round bar sample to obtain a gauge length segment on the round bar sample; Detecting the surface roughness of the gauge section to obtain a roughness value Rz; Ink is sprayed at at least one preset marking point on the surface of the gauge section to obtain an ink marking line with a preset ink line width and a preset ink spraying thickness; Performing marking etching along the ink marking line to obtain an etched marking line with a preset etching line width and a preset etching depth, wherein the preset etching line width is less than half of the preset ink line width, and the preset etching depth is less than or equal to the sum of the preset ink spraying thickness and Rz / 2; The surface quality detection system is provided with a roughness measuring head for measuring the surface concave-convex height of the round bar sample; The detecting the surface roughness of the gauge section to obtain a roughness value Rz comprises: placing the roughness measuring head in contact with the surface of the gauge section; Control the roughness measuring head to move from one end of the gauge section to the other end along the axial direction of the round rod sample, record the maximum and minimum values ​​of the measurement data, and calculate the difference Rz1 between the maximum and minimum values; The roughness measuring head is controlled to contact different circumferential positions of the surface of the gauge section, and Rz2, Rz3, ..., Rz are measured and calculated in sequence. n ; For Rz1, Rz2, Rz3... Rz n An average calculation was performed to obtain the Rz.

2. The round bar specimen marking and dividing method according to claim 1, characterized in that: The high-definition inkjet system is equipped with a high-precision nozzle; The ink spraying is performed on at least one preset marking point on the surface of the gauge section, comprising: Controlling the round rod sample to rotate around its own axis; The high-precision nozzle sprays ink in a full circumferential direction on the round rod sample at the preset marking point to obtain a full circumferential ink marking line.

3. The round bar sample marking and dividing method according to claim 2, characterized in that: The method of spraying ink in a full circumferential direction on the round rod sample at the preset marking point by the high-precision nozzle to obtain a full circumferential ink marking line includes: Adjusting the spraying rotation speed of the round rod sample or the flow rate and velocity of the ink supply according to the preset ink spraying thickness; The nozzle size of the high-precision nozzle is adjusted according to the preset ink line width.

4. The round bar specimen marking and dividing method according to claim 1, characterized in that: The adjustable laser etching system has a laser head; The step of performing marking etching along the ink marking line comprises: Controlling the round rod sample to rotate around its own axis; The laser head is used to perform full circumferential marking etching on the ink marking line.

5. The round bar specimen marking and dividing method according to claim 1, characterized in that: The marking positioning system is provided with two coaxial measuring heads spaced apart along the axial direction of the round rod sample, and the two coaxial measuring heads are capable of axial movement and circumferential rotation; The marking and positioning of the round bar sample comprises: Adjusting the positions of the two coaxial measuring heads to be near the gauge length section; The two coaxial measuring heads are axially moved according to the preset gauge length so that the positions of the two coaxial measuring heads completely correspond to the estimated gauge length positions of the round bar sample, and the positions of the two coaxial measuring heads are fixed.

6. The round bar specimen marking and dividing method according to claim 1, characterized in that: The automatic clamping system is provided with an automatic self-centering clamping head and a pre-tightening head which are arranged relatively spaced along the axial direction of the round bar sample, and the automatic self-centering clamping head and the pre-tightening head can move axially and rotate circumferentially; The positioning and clamping of the round bar sample comprises: One end of the round bar sample is clamped by the automatic self-centering chuck, and the other end is fixed by coaxially applying a preset axial preload force to the round bar sample through a preload head.

7. A round bar sample marking and dividing device, characterized in that: The round bar sample marking and dividing device has mutually orthogonal X-axis, Y-axis and Z-axis directions, and comprises: An automatic clamping system is provided with an automatic self-centering clamping head and a pre-tightening head which are arranged relatively spaced apart along the X-axis direction, and the automatic self-centering clamping head and the pre-tightening head can move axially and rotate circumferentially along the X-axis direction; The marking positioning system is provided with two coaxial measuring heads and a spacing measuring assembly, wherein the two coaxial measuring heads are arranged at intervals along the X-axis direction beside the automatic self-centering chuck and the preload head, and the spacing measuring assembly is used to measure the distance between the two coaxial measuring heads; The surface quality detection system is provided with a roughness measuring head and a surface roughness detection and digital display component which are connected to each other, wherein the roughness measuring head is used to measure the surface concave-convex height of the round bar sample, and the surface roughness detection and digital display component is used to process and display the surface roughness data of the round bar sample; A high-definition inkjet system, comprising a high-precision nozzle and an ink supply control assembly connected to each other, wherein the nozzle size of the high-precision nozzle is adjustable to achieve the printing of marks of different thicknesses, and the ink supply control assembly is used to achieve the supply of ink; An adjustable laser etching system having an interconnected laser head and laser generation and control components; It also includes a fast automatic switching system, the fast automatic switching system has three workstations, the surface quality detection system, the high-definition inkjet system and the adjustable laser etching system are respectively arranged on the three workstations, the three workstations are divided into a current working workstation, a first preparation workstation and a second preparation workstation, the fast automatic switching system is configured to switch the workstations where the surface quality detection system, the high-definition inkjet system and the high-definition inkjet system are located, and the measuring position of the surface quality detection system, the spraying point position of the high-definition inkjet system and the etching position of the adjustable laser etching system when located at the current working workstation are all at the same position; It also includes a moving system, the fast automatic switching system is supported and installed on the moving system, and the moving system is configured to control the fast automatic switching system to move in the X-axis, Y-axis and Z-axis directions.

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