Round rod mucilage glue marking tool and using method

Abstract

The invention relates to a round bar mucilage glue marking tool and a using method. The round bar mucilage glue marking tool comprises a rotary table, a round bar containing platform is arranged at the top end of the rotary table, a lifting plate is concavely arranged at the top of the round bar containing platform, a plurality of clamping grooves are concavely formed in the inner ring face of the lifting plate, and locking pieces are inserted into the clamping grooves. The invention discloses a tool for round bar splicing and gluing concentricity detection, and provides a detection method for detecting crystal bar concentricity and crystal line alignment after short round bars are spliced and glued.

Description

Technical Field

[0001] The present invention belongs to the field of round bar adhesive marking tooling and its usage method, specifically a round bar adhesive marking tooling and its usage method. Background Art

[0002] At present, various crystalline silicon cell technologies in the photovoltaic industry are blooming and competing with each other. For the upstream crystal pulling process at the battery end, in addition to distinguishing PN type, electrical properties (minority carrier lifetime, resistance, oxygen content, carbon content), etc. for single crystal silicon rods, for heterojunction cells (HJT), the minority carrier lifetime of N-type single crystal silicon wafers is not less than 500 μs, and the carbon and oxygen contents are respectively less than 1 ppma and 14 ppma, while the minority carrier lifetime of conventional N-type single crystal silicon wafers is not less than 800 μs, and the carbon and oxygen contents are respectively less than 1 ppma and 12 ppma. By comparison, it is found that the heterojunction has lower requirements for the electrical properties of single crystal silicon rods. Therefore, a small part of the single crystal long silicon rods with minority carrier lifetime and oxygen content not meeting the requirements of conventional N-type are used for the production of heterojunctions. Usually, these crystal rods are shorter, ≤200 mm, generally the heads of single crystal silicon rods. Because the oxygen content is high and does not meet the conventional requirements, they are used as recycled materials for cleaning, crushing, grading, and then remelting and pulling again. However, due to the special requirements of heterojunctions, these "recycled materials" can not only be not wasted, but also be used as raw materials for the production of heterojunction silicon wafers.

[0003] However, because the lengths of these silicon rods are short and do not meet the minimum processing rod length requirements for machining and squaring, multiple short rods need to be spliced and glued to meet concentricity and crystal line alignment before they can be processed on the machine. Usually, workers stack and glue the crystal rods based on experience and visually align the crystal lines to meet the processing requirements on the machine. Due to slightly different diameters of the crystal rods and the bending of the crystal lines, without the assistance of relevant tools for detection, there may be problems such as crystal line cutting deviation, too large or too small side margins of the square rod after machining, resulting in NG abnormal losses. Therefore, a round bar adhesive marking tooling and its usage method are proposed. Summary of the Invention

[0004] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract, and the title, but such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the following technical problems existing in the prior art: Since the lengths of these silicon rods are short and do not meet the minimum processing rod length requirements for machining and grinding, it is necessary to splice and glue multiple short rods to meet concentricity and crystal line alignment before they can be machined on the machine. Usually, workers stack and glue the crystal rods based on experience and visually align the crystal lines to meet the machining requirements on the machine. However, due to slightly different diameters of the crystal rods and curved crystal lines, without relevant tool assistance for detection, there may be problems such as crystal line deviation during machining, too large or too small side margins of the square rod, resulting in abnormal NG losses.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: It includes a rotating turntable, and a round rod placement platform is provided at the top of the rotating turntable. An installation groove is recessed on the top of the round rod placement platform, and several clamping grooves are recessed on the inner circumferential surface of the installation groove. A locking member is inserted into the clamping groove.

[0007] Insert the short crystal rod one into the installation groove, and the locking member is stuck between the short crystal rod one and the inner wall of the installation groove, so that the installation groove is locked on the round rod placement platform. The top of the short crystal rod one is fixedly connected to the short crystal rod two through glue.

[0008] A dial indicator universal support is provided on the round rod placement platform, and a dial indicator is installed on the dial indicator universal support. The probe of the dial indicator abuts against the surface of the short crystal rod two.

[0009] As a preferred technical solution of the round rod gluing and marking tooling and its use method, the rotating turntable is rotationally connected to a rotating platform, and a motor is provided inside the rotating platform. The power output end of the motor is connected to the rotating platform.

[0010] The motor can control the rotation of the rotating turntable.

[0011] As a preferred technical solution of the round rod gluing and marking tooling and its use method, threaded holes are recessed on the inner side of the round rod placement platform, and screws pass through the threaded holes to be fixedly connected to the round rod placement platform.

[0012] As a preferred technical solution of the round rod gluing and marking tooling and its use method, the round rod placement platform includes a main body platform and a convex ring, and a convex ring is provided at the top of the main body platform.

[0013] As a preferred technical solution of the round rod gluing and marking tooling and its use method, the locking member includes a structural plate, a flat plate, a base seat, and a lifting plate. A flat plate is provided at the top of the structural plate. The materials of the flat plate and the structural plate are both phenolic resin. A base seat is provided on one side of the structural plate, and the top of the base seat is connected to the flat plate. A lifting plate is provided at the top of the flat plate, and a structural strengthening member is connected between the lifting plate and the base seat.

[0014] As a preferred technical solution of the round bar adhesive marking tooling and its use method, the structure strengthening member includes a mechanism rod and an attachment protrusion ball. The mechanism rod is L-shaped. The mechanism rod is connected to the lifting plate and the base seat. A plurality of attachment protrusion balls are evenly arranged on the mechanism rod. The outer side of the attachment protrusion ball is fixedly connected to the base seat. The diameter of the mechanism rod is R. The center of the attachment protrusion ball is connected to the connection points of the attachment protrusion ball with the top and bottom of the mechanism rod, and the included angle between the connections is α.

[0015] As a preferred technical solution of the round bar adhesive marking tooling and its use method, a limiting block is arranged on one side of the top of the structure plate away from the base seat.

[0016] The main functions are as follows:

[0017] 1. Rotating turntable: As a rotating component, it drives the upper round bar placement platform to rotate. It can be rotated manually or automatically in cooperation with different structures. Among them, in cooperation with the gear and gear ring structure and the roller bearing structure, the platform can be manually rotated by hand to perform concentric dial indicator inspection, and it can also be rotated automatically in cooperation with a frequency conversion motor to detect the concentricity of the round bar.

[0018] 2. Round bar placement platform: It can place round bars with different diameters, including φ255mm, φ265mm, φ285mm, φ305mm. There are 4 layers of platforms inside, which are distributed in a stepped shape and can correspondingly place 10 / 10.5 / 11.2 / 12-inch round bars, used for limiting and preventing the crystal bar from slipping and running off during the adhesive process.

[0019] 3. A set of dial indicator and dial indicator universal support is used to detect the crystal line and concentricity by fitting the dial indicator to the outer surface of the crystal bar after the crystal bar is adhesively bonded. It is necessary to perform dial indicator inspection on the corresponding crystal bar for several sections of adhesive bonding, and the detection accuracy is required to be ≤0.20mm.

[0020] The beneficial effects of the round bar adhesive marking tooling and its use method of the present invention: The tooling for concentric detection of round bar splicing and adhesive bonding provides a detection method for detecting the concentricity of crystal bars and the alignment of crystal lines after short round bar splicing and adhesive bonding;

[0021] This tooling and the crystal line and concentric detection method effectively eliminate the problem of poor dimensions after the adhesive bar is squared and reduce the abnormality of dial indicator retraction of the adhesive bar during squaring.

[0022] The locking part and the clamping groove cooperate to quickly lock the round bar placement platform and the short crystal bar I. Description of the drawings

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a schematic top view structure of the present invention Figure 1 ;

[0026] Figure 3 is a schematic diagram of the connection structure between the rotating turntable and the round bar placement platform of the present invention;

[0027] Figure 4 is a schematic top view structure of the present invention Figure 2 ;

[0028] Figure 5 is a schematic diagram of the locking structure of the present invention;

[0029] Figure 6 is a schematic diagram of the structural dimensions of the present invention;

[0030] Figure 7 is for the present invention Figure 4 a partial enlarged structural schematic diagram of part A;

[0031] Figure 8 is for the present invention Figure 4 a partial enlarged structural schematic diagram of part B.

[0032] Reference numerals: 1, rotating turntable; 2, round bar placement platform; 3, short crystal bar 1; 4, short crystal bar 2; 5, dial indicator; 6, dial indicator universal bracket; 7, threaded hole; 8, installation groove; 9, lifting plate; 10, mechanism rod; 11, base seat; 12, flat plate; 13, limiting block; 14, structural plate; 15, attached protruding ball; 16, clamping groove; 201, main body table; 202, convex ring. Detailed embodiments

[0033] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings of the specification.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0035] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that may be included in at least one implementation manner of the present invention. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it an individual or selectively mutually exclusive embodiment with other embodiments.

[0036] Thirdly, the present invention is described in detail in conjunction with schematic diagrams. When detailing the embodiments of the present invention, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally in a non-general proportion, and the schematic diagrams are only examples, and they should not limit the scope of protection of the present invention herein. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual production.

[0037] As Figures 1 to 8 shown, the present invention provides a round bar glue marking tooling and a using method, including a rotating turntable 1. A round bar placing platform 2 is arranged at the top of the rotating turntable 1. An installation groove 8 is recessed on the top of the round bar placing platform 2. A plurality of clamping grooves 16 are recessed on the inner circumferential surface of the installation groove 8, and locking members are inserted in the clamping grooves 16;

[0038] Insert the short crystal bar 3 into the installation groove 8, and the locking member is stuck between the short crystal bar 3 and the inner wall of the installation groove 8, so that the installation groove 8 is locked on the round bar placing platform 2. The top of the short crystal bar 3 is fixedly connected with a short crystal bar 4 through glue;

[0039] A dial indicator universal support 6 is arranged on the round bar placing platform 2, and a dial indicator 5 is installed on the dial indicator universal support 6. The probe of the dial indicator 5 abuts against the surface of the short crystal bar 4.

[0040] The rotating turntable 1 is rotatably connected to the rotating platform. A motor is arranged inside the rotating platform, and the power output end of the motor is connected to the rotating platform;

[0041] The motor can control the rotation of the rotating turntable 1.

[0042] Threaded holes 7 are recessed on the inner side of the round bar placing platform. Threaded holes 7 are recessed in the installation groove 8. Screws pass through the threaded holes 7 and are fixedly connected to the round bar placing platform 2.

[0043] The round bar placing platform 2 includes a main body platform 201 and a convex ring 202. A convex ring 202 is arranged on the top of the main body platform 201.

[0044] The locking member includes a structural plate 14, a flat plate 12, a base seat 11 and a lifting plate 9. The flat plate 12 is arranged at the top of the structural plate 14. The materials of the flat plate 12 and the structural plate 14 are both phenolic resin. A base seat 11 is arranged on one side of the structural plate 14. The top of the base seat 11 is connected to the flat plate 12. The lifting plate 9 is arranged at the top of the flat plate 12. A structural reinforcement is connected between the lifting plate 9 and the base seat 11.

[0045] The structural reinforcement includes a mechanism rod 10 and an attachment protrusion ball 15. The mechanism rod 10 is L-shaped. The mechanism rod 10 connects the lifting plate 9 and the base seat 11. Several attachment protrusion balls 15 are evenly arranged on the mechanism rod 10. The outer side of the attachment protrusion ball 15 is fixedly connected to the base seat 11. The diameter of the mechanism rod 10 is R. The center of the attachment protrusion ball 15 is connected to the connection point between the attachment protrusion ball 15 and the top and bottom of the mechanism rod 10. The angle between the connecting lines is α, and α is greater than 90 degrees.

[0046] A limiting block 13 is disposed on the top of the structural plate 14 at a side away from the base seat 11 .

[0047] The main functions are as follows:

[0048] 1. Rotating turntable: As a rotating component, it drives the upper round rod placement platform to rotate. It can be rotated manually or automatically with different structures. The gear ring structure and roller bearing structure can realize manual rotation of the platform for concentric meter detection, and it can also be used with a variable frequency motor to realize automatic rotation to detect the concentricity of the round rod.

[0049] 2. Round rod placement platform: It can place round rods of different diameters, including φ255mm, φ265mm, φ285mm, and φ305mm. There are 4 platforms inside, which are distributed in a stepped manner. They can place 10 / 10.5 / 11.2 / 12-inch round rods respectively, which are used to limit the position and prevent the crystal rod from slipping and deviating during the gluing process.

[0050] 3. A dial indicator and a dial indicator universal bracket form a set. After the crystal rod is glued, the dial indicator is attached to the outer surface of the crystal rod to detect the crystal line and concentricity. The glued sections need to be tested on the corresponding crystal rods, and the detection accuracy is required to be ≤0.20mm.

[0051] How to use the round bar adhesive marking tooling:

[0052] S1. Material preparation:

[0053] S1.1, Round bar quality screening:

[0054] Single crystal round bars with end surface flatness error ≤ 0.05mm and no surface scratches are preferred;

[0055] Measure the diameter of the round bar using a vernier caliper to ensure it matches the slot on the round bar placement platform 2 (φ255mm / φ265mm / φ285mm / φ305mm);

[0056] S1.2. Environmental preparation:

[0057] Ensure that the operating environment temperature is 15 - 30°C and the humidity is ≤65% to avoid abnormal glue curing speed or rusting of metal parts;

[0058] Clean the workbench surface and remove surrounding flammable materials (such as paper scraps and oil stains) to prevent safety hazards caused by laser marking or glue volatilization;

[0059] S2. Material placement:

[0060] S2.1. Step platform matching:

[0061] The step platform is the round bar placement platform 2 with multiple stepped installation slots. The installation slots of each size are coaxial, and the larger the size, the smaller the depth;

[0062] Select the corresponding step platform according to the round bar size:

[0063] φ255mm → installation slot of 10-inch slot;

[0064] φ265mm → installation slot of 10.5-inch slot;

[0065] φ285mm → installation slot of 11.2-inch slot;

[0066] φ305mm → installation slot of 12-inch slot;

[0067] Use a dial indicator to pre-check the concentricity of the slot. When the deviation exceeds 0.1mm, it needs to be polished and corrected with sandpaper;

[0068] S2.2. Locking part installation:

[0069] After inserting the short crystal bar 3 into the installation slot 8, insert the locking part (structural plate 14 + flat plate 12). Press down the lifting plate 9 to make the phenolic resin flat plate 12 fit the surface of the round bar, and use the L-shaped structure of the mechanism rod 10 to enhance the shear resistance;

[0070] Fix it through the screw passing through the threaded hole 7 of the round bar placement platform 2, and control the torque at 15 - 20N·m to prevent over-tightening from damaging the step platform;

[0071] S3. First table inspection:

[0072] S3.1. Dial indicator calibration:

[0073] Calibrate the zero point of the dial indicator 5 with a standard gauge before starting to ensure the detection accuracy ≤0.01mm;

[0074] When adjusting the dial indicator universal support 6, the "three-point positioning method" is adopted:

[0075] The first point: The probe touches the highest point of the round bar;

[0076] The second point: The probe touches the lowest point of the round bar;

[0077] The third point: The probe touches the reference point in the horizontal direction of the round bar;

[0078] S3.2. Dynamic detection optimization:

[0079] Manual rotation mode: Rotate the round bar placement platform 2 at a constant speed (rotation speed 1 - 2 r / min), and observe whether the dial indicator jump curve is smooth;

[0080] Automatic rotation mode: Enable the motor, set the rotation speed to 5 r / min and record the jump values for 3 consecutive circles, and take the average value as the judgment basis;

[0081] S4. Round bar gluing:

[0082] S4.1. Resin glue ratio and coating:

[0083] Mix according to the ratio of A / B glue 1:1, use an electric stirrer to stir at 1000 r / min for 30 seconds to eliminate air bubbles;

[0084] Control the glue coating thickness within 0.1 - 0.3 mm, adopt the "Z" - shaped coating method to ensure a uniform glue layer, and leave a 5 - mm glue - free area at the edge to prevent glue overflow;

[0085] S4.2. Alignment and pressurization:

[0086] Use a laser indicator to assist in crystal line alignment: Align the laser pen with the crystal line mark of the first round bar, and adjust the position of the second round bar until the laser spot coincides with the mark;

[0087] Adopt the stepped pressurization method during pressurization:

[0088] The initial pressure of 0.5 MPa is maintained for 5 min;

[0089] Gradually increase to 1.2 MPa and maintain for 30 min to ensure full penetration of the glue layer;

[0090] S5. Re - perform dial indicator detection and glue amount adjustment:

[0091] S5.1. Multi - point detection strategy:

[0092] Select 4 detection points (every 90°) on the second round bar, record the jump values respectively. If the maximum value > 0.2 mm, the deviation area needs to be located;

[0093] Correction by "local glue filling method": Supplement a small amount of glue (about 0.05 g) at the peak position of the vibration, level it with a scraper, and then re-pressurize and cure it.

[0094] S5.2. Cumulative error control:

[0095] When splicing in multiple segments, each time an additional round bar is added, the concentricity of the middle segment needs to be additionally detected to prevent the error from stacking up and exceeding the total tolerance range.

[0096] S6. Glue standing and post-treatment:

[0097] S6.1. Curing environment management:

[0098] During the standing stage, the environmental temperature should be maintained at 25 ± 2 °C and the humidity at 50 ± 5% to avoid shrinkage and cracking of the glue layer.

[0099] Use an infrared thermometer to monitor the temperature of the glue layer to ensure uniform curing.

[0100] S6.2. Preparation for square processing:

[0101] After the standing is over, clean the residual glue stains on the surface of the round bar with alcohol to prevent tool contamination during subsequent processing.

[0102] Use a laser marking tooling to mark the batch number and dimensional parameters on the end face of the round bar for easy traceability management.

[0103] S7. Optimization of multi-segment splicing glue:

[0104] S7.1. Automated process design:

[0105] For continuous splicing requirements, the programmable control rotary table 1 can be used for automatic cyclic detection, and combined with a vision positioning system to achieve unmanned production.

[0106] Introduce RFID tags to record the detection data of each round bar and upload it to the cloud database 13.

[0107] It should be understood that in the development process of any actual implementation, such as in any engineering or design project, a large number of specific implementation decisions can be made. Such development efforts may be complex and time-consuming, but for those ordinary technical personnel who benefit from this disclosure, without excessive experimentation, the development efforts will be a routine work of design, manufacturing, and production.

[0108] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. Round rod adhesive marking tooling and its usage method, characterized in that: It includes a rotating turntable (1), at the top of the rotating turntable (1) there is a round bar placement platform (2), on the top of the round bar placement platform (2) there is a concave installation groove (8), on the inner circumferential surface of the installation groove (8) there are several clamping grooves (16), and locking parts are inserted into the clamping grooves (16). Insert the short crystal bar one (3) into the installation groove (8), and the locking part is stuck between the short crystal bar one (3) and the inner wall of the installation groove (8), so that the short crystal bar one (3) is locked on the round bar placement platform (2), and the top of the short crystal bar one (3) is fixedly connected with the short crystal bar two (4) through glue. On the round bar placement platform (2) there is a dial indicator universal support (6), on the dial indicator universal support (6) there is a dial indicator (5), and the probe of the dial indicator (5) abuts against the surface of the short crystal bar two (4).

2. The round bar adhesive marking tooling and its usage method according to claim 1, characterized in that: The rotating turntable (1) is rotatably connected to a rotating platform, and a motor is arranged inside the rotating platform, and the power output end of the motor is connected to the rotating platform.

3. The round bar adhesive marking tooling and its usage method according to claim 1, characterized in that: On the inner side of the round bar placement platform (2) there is a concave threaded hole (7), and a screw passes through the threaded hole (7) and is fixedly connected with the round bar placement platform (2).

4. The round bar adhesive marking tooling and the using method according to claim 1, characterized in that: The round bar placement platform (2) includes a main body platform (201) and a convex ring (202), and a convex ring (202) is arranged on the top of the main body platform (201).

5. The round bar adhesive marking tooling and its usage method according to claim 1, characterized in that: The locking part includes a structural plate (14), a flat plate (12), a base seat (11) and a lifting plate (9), at the top of the structural plate (14) there is a flat plate (12), the materials of the flat plate (12) and the structural plate (14) are both phenolic resin, on one side of the structural plate (14) there is a base seat (11), the top of the base seat (11) is connected to the flat plate (12), at the top of the flat plate (12) there is a lifting plate (9), and a structural strengthening member is connected between the lifting plate (9) and the base seat (11).

6. The round bar adhesive marking tooling and its usage method according to claim 5, characterized in that: The structural strengthening member includes a mechanism rod (10) and an attached protruding ball (15), the mechanism rod (10) is L-shaped, the mechanism rod (10) is connected to the lifting plate (9) and the base seat (11), and several attached protruding balls (15) are evenly arranged on the mechanism rod (10).

7. The round bar adhesive marking tooling and its usage method according to claim 1, characterized in that: On the side of the top of the structural plate (14) far from the base seat (11) there is a limiting block.

8. The round bar adhesive marking tooling and the using method according to claim 1, characterized in that: Usage method of the round bar glue marking tooling:[[]] S1. Material preparation:[[]] S1.

1. Round bar quality screening:[[]] Preferably select a single crystal round bar with an end face flatness error ≤ 0.05 mm and no bumps on the surface; Use a vernier caliper to measure the diameter of the round bar to ensure its matching with the slot position of the round bar placement platform (2) (φ255 mm / φ265 mm / φ285 mm / φ305 mm); S1.

2. Environment preparation:[[]] Ensure that the operating environment temperature is 15 - 30 °C and the humidity ≤ 65%, to avoid abnormal glue curing speed or rust of metal parts; Clean the workbench surface and remove surrounding flammable substances (such as paper scraps, oil stains) to prevent safety hazards caused by laser marking or glue volatilization; S2. Material placement:[[]] S2.

1. Step platform matching:[[]] Select the corresponding step platform according to the round bar size:[[]] φ255 mm → 10-inch slot position; φ265 mm → 10.5-inch slot position; φ285mm → 11.2 - inch slot; φ305mm → 12 - inch slot; Use a dial indicator to pre - check the concentricity of the slot. When the deviation exceeds 0.1mm, it needs to be polished and corrected with sandpaper; S2.

2. Installation of the locking part: After inserting the short crystal bar 1 (3) into the installation slot (8), insert the locking part (structural plate (14) + flat plate (12)). Press down the flat plate (12) made of phenolic resin to fit the surface of the round bar through the lifting plate (9), and use the L - shaped structure of the mechanism rod (10) to enhance the shear resistance; Fix it by passing a screw through the threaded hole (7) of the round bar placement platform (2), and control the torque at 15 - 20N·m to prevent over - tightening from damaging the stepped platform; S3. First dial indicator inspection: S3.

1. Calibration of the dial indicator: Before starting, calibrate the zero point of the dial indicator (5) with a standard gauge block to ensure the detection accuracy ≤ 0.01mm; When adjusting the dial indicator universal bracket (6), adopt the "three - point positioning method": The first point: The probe touches the highest point of the round bar; The second point: The probe touches the lowest point of the round bar; The third point: The probe touches the reference point in the horizontal direction of the round bar; S3.

2. Dynamic detection optimization: Manual rotation mode: Rotate the round bar placement platform (2) evenly (rotation speed 1 - 2r / min), and observe whether the beating curve of the dial indicator is smooth; Automatic rotation mode: Enable the motor, set the rotation speed at 5r / min and record the beating values for 3 consecutive circles, and take the average value as the judgment basis; S4. Gluing of the round bar: S4.

1. Resin glue ratio and coating: Mix according to the ratio of A / B glue 1:1, and use an electric stirrer to stir at 1000r / min for 30 seconds to eliminate air bubbles; Control the coating thickness at 0.1 - 0.3mm, and adopt the "Z" - shaped coating method to ensure the uniformity of the glue layer. Leave a 5mm glue - free area at the edge to prevent glue overflow; S4.

2. Alignment and pressurization: Use a laser indicator to assist in aligning the crystal line: Align the laser pen with the crystal line mark of the first round bar, and adjust the position of the second round bar until the laser spot coincides with the mark; Adopt the stepped pressurization method during pressurization: The initial pressure is 0.5MPa and is maintained for 5 minutes; Gradually increase to 1.2MPa and maintain for 30 minutes to ensure sufficient penetration of the glue layer; S5. Re - dial indicator inspection and glue amount adjustment: S5.

1. Multi - point detection strategy: Select 4 detection points (every 90°) on the second round bar, record the beating values respectively. If the maximum value > 0.2mm, it is necessary to locate the deviation area; Correct it by the "local glue - filling method": Supplement a small amount of glue (about 0.05g) at the position of the beating peak, level it with a scraper and then re - pressurize and cure; S5.

2. Cumulative error control: When splicing multiple segments, it is necessary to additionally detect the concentricity of the middle segment every time an additional round bar is added to prevent the error from stacking beyond the total tolerance range; S6. Glue static setting and post - treatment: S6.

1. Curing environment management: During the static setting stage, maintain the environmental temperature at 25 ± 2°C and the humidity at 50 ± 5% to avoid shrinkage and cracking of the glue layer; Use an infrared thermometer to monitor the temperature of the glue layer to ensure uniform curing; S6.

2. Preparation for square - opening processing: After the static setting is completed, clean the residual glue stains on the surface of the round bar with alcohol to prevent contamination of the cutting tool during subsequent processing; Use a laser marking tooling to mark the batch number and dimensional parameters on the end face of the round bar for easy traceability management; S7. Optimization of multi-segment splicing adhesive: S7.

1. Automated process design: For continuous splicing requirements, the programmable control rotary table (1) automatically detects in a cycle, and combines with the vision positioning system to achieve unmanned production; Introduce RFID tags to record the detection data of each section of the round bar and upload it to the cloud database (13).

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