A disc tool positioning grinding piece splitting and welding device and a splitting and welding process

Abstract

This invention discloses a grinding disc segment welding device and process for positioning with a disc fixture. The device includes a mounting platform with a placement ring and a welding area for double-sided welding by a welding machine. A driving mechanism includes a drive motor located below the mounting platform and a rotating disk driven by the motor. An installation structure is located within the placement ring and includes an arc-shaped rotating block connected to the rotating disk and a supporting crossbar connected to the arc-shaped rotating block. By configuring the mounting platform, rotating disk, and installation structure, a three-in-one positioning system integrating radial, circumferential, and axial directions is constructed, with the arc-shaped rotating block, a corrective arc plate, and a limiting component as its core. The magnetic suction table in the limiting component can slide along the supporting crossbar, and the cylinder-driven clamping plate on it can internally tighten the positioning hole of the grinding disc, achieving reliable axial positioning and end-face locking.

Description

Technical Field

[0001] This invention relates to the field of workpiece welding equipment technology, and in particular to a grinding disc segment welding device and segment welding process for positioning a disc tool. Background Technology

[0002] Traditional casting processes for large-diameter grinding discs, typically exceeding 600mm, present significant technical drawbacks. First, large, thin-walled, disc-shaped castings are highly susceptible to warping, deformation, internal shrinkage, and cracking during solidification and cooling, resulting in low yields. Second, integral casting places stringent demands on molds, melting, and heat treatment equipment, leading to high unit manufacturing costs. Furthermore, once a portion of the rack wears down, the entire grinding disc becomes unusable, resulting in substantial maintenance costs.

[0003] To overcome the above problems, existing technologies propose a method of segmented casting followed by reassembly and welding. However, several challenges remain in practical operation. First, the lack of specialized tooling means that the positioning of small grinding discs before welding relies mainly on manual scribing or simple clamps, making it difficult to accurately reproduce their radial and circumferential spatial positions within the entire circular grinding disc. This results in poor flatness, coaxiality of inner and outer circles, and alignment accuracy of adjacent racks in the welded assembly. Second, during welding, especially laser welding or argon arc welding, heat input causes thermal stress deformation in the workpiece. Existing technologies lack effective dynamic constraints and real-time clamping mechanisms, making it difficult to control welding deformation. Third, grinding discs typically require double-sided welding to ensure connection strength, but existing methods of single-sided welding followed by flipping and re-welding are not only inefficient but also prone to introducing new positioning errors during secondary clamping. Fourth, most devices lack restrictions on the radial and circumferential degrees of freedom of the grinding discs, as well as reliable tightening structures for the positioning holes of the grinding discs themselves, leading to movement during welding and affecting the accuracy of the weld point position.

[0004] Therefore, developing a specialized device and supporting process capable of achieving high-precision positioning of large-size grinding discs, synchronous welding on both sides, and effectively suppressing welding deformation is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] In view of the problems in the prior art, the present invention aims to overcome the deficiencies of the prior art by providing a grinding disc segmentation and welding device and a segmentation and welding process for positioning a disc tool.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a grinding disc segment welding device for positioning a disc tool, including an installation platform with a placement ring on it, and a welding area for double-sided welding by a welding machine on the installation platform. The drive mechanism includes a drive motor disposed below the mounting platform and a rotating disk driven by it. The mounting structure, disposed within the placement ring, includes an arc-shaped rotating block connected to the rotating disk and a support crossbar connected to the arc-shaped rotating block. The support crossbar is equipped with a limiting component for radial positioning of the sharded grinding discs and a correction arc-shaped plate for circumferential correction. A side limiting platform, fixed to the side of the mounting platform, includes an electrically controlled push rod and a clamping plate driven by it to move up and down, used to fix the end face of the grinding disc at the welding area.

[0007] On the other hand, the present invention also provides a grinding disc segmentation and welding process for positioning with a disc tool, applicable to the above-mentioned grinding disc segmentation and welding device for positioning with a disc tool, comprising the following steps: S1. Segmented design: Based on the risk of casting deformation of large-sized grinding discs, they are divided into two or three independent small grinding discs for segmented casting. S2. Tooling simulation positioning: Make a positioning tooling disc that simulates the size and layout of the mounting holes on the bottom plate of the grinding mill. Lock the small grinding disc to be welded onto the positioning tooling disc through its own positioning holes. S3. Pre-treatment of welding bevel: Plan the welding point at the welding part between adjacent small grinding discs, and grind the welding edge to form a welding bevel; S4. Double-sided spot welding fixation: Under the constraint of the positioning tooling disc, multi-point symmetrical spot welding is performed on adjacent small grinding discs; S5. Assembly verification and finishing: Using the positioning tooling disc as a verification platform, the welded grinding disc assembly is assembled, verified, shaped and surface-processed.

[0008] The beneficial effects of this invention are: (1) This invention constructs a three-in-one positioning system of radial, circumferential and axial directions, with an arc-shaped rotating block, a corrective arc-shaped plate and a limiting component as the core by setting up an installation platform, a rotating disk and an installation structure. The magnetic suction table in the limiting component can slide along the support crossbar, and the cylinder on it drives the clamping plate to tighten the positioning hole of the grinding disc from the inside, realizing reliable axial positioning and end face locking; at the same time, the corrective arc-shaped plate continuously pushes the outer edge of the grinding disc under the action of the tension spring, so that its inner end is elastically pressed against the arc-shaped rotating block, thereby automatically eliminating the circumferential gap and correcting the arc surface deviation after the piece is divided.

[0009] (2) The present invention symmetrically sets welding machines on the upper and lower sides of the welding area, realizing simultaneous welding of the double-sided weld seam, so that the front and back sides of the grinding disc are heated evenly and the thermal stress is balanced, which greatly reduces the warping deformation commonly seen after single-sided welding. At the same time, the electric control push rod in the side limiting stage drives the clamping plate to dynamically clamp the end face of the grinding disc at the welding station. This works in conjunction with the stable support provided by the rolling ball and rotating guide rail during rotation, forming a flexible constraint mechanism of instantaneous high pressure during welding and low resistance rotation during non-welding. The device is also equipped with an optimized segmented welding process: the risk of deformation of large-sized castings is reduced by segmented casting of whole parts, the tooling disc is used to simulate the actual installation hole position for locking and positioning, and symmetrical welding points are set in the gap position of adjacent grinding discs and the inner and outer rings. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Figure 1 A schematic diagram of the overall structure of a preferred embodiment of a grinding disc segmentation and welding device for positioning a disc tool provided by the present invention; Figure 2 for Figure 1 Axis view; Figure 3 This is a front view of the installation platform. Figure 4 This is a schematic diagram of the three-dimensional structure of the side limiting platform; Figure 5 This is a schematic diagram of the three-dimensional structure of the rotating guide rail; Figure 6 A schematic diagram of the three-dimensional structure supporting the crossbar; Figure 7 To revise the connection diagram between the curved plate and the supporting crossbar; Figure 8 This is a schematic diagram of the three-dimensional structure of the limiting component; Figure 9 A flowchart of a grinding disc segment welding process for positioning with a disc tool.

[0012] Reference numerals: 100, Adjustment seat; 110, Extension arm; 120, Support cover; 121, Exhaust fan; 130, Inner protective cover; 200. Mounting platform; 210. Placement ring; 220. Rotating guide rail; 230. Welding area; 300. Side limiting platform; 310. Fixing frame; 320. Electrically controlled push rod; 330. Upper mounting platform; 340. Horizontal frame; 350. Pressure plate; 400. Drive motor; 410. Rotary disc; 420. Mounting slide; 500. Welding machine; 600. Mounting structure; 610. Support crossbar; 611. First elongated hole; 612. Second elongated hole; 620. Arc-shaped rotating block; 630. Rolling ball; 640. Correcting arc plate; 641. Tension spring; 650. Limiting assembly; 651. Magnetic suction table; 652. Connecting table; 653. Cylinder; 654. Clamping plate. Detailed Implementation

[0013] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0015] like Figures 1-9 As shown, the present invention provides a grinding disc segment welding device for positioning a disc tooling, which includes an installation platform 200 with a placement ring 210 on it, and a welding area 230 for double-sided welding by a welding machine 500. The drive mechanism includes a drive motor 400 disposed below the mounting platform 200 and a rotating disk 410 driven therefrom; The mounting structure 600, disposed within the placement ring 210, includes an arc-shaped rotating block 620 connected to the rotating disk 410 and a support crossbar 610 connected to the arc-shaped rotating block 620. The support crossbar 610 is provided with a limiting component 650 for radial positioning of the sharded grinding discs and a correction arc-shaped plate 640 for circumferential correction. A side limiting platform 300 is fixed to the side of the mounting platform 200 and includes an electrically controlled push rod 320 and a clamping plate 350 driven by it to move up and down, used to fix the end face of the grinding disc at the welding area 230.

[0016] The placement ring 210 is used to initially support the slit grinding discs after they have been divided into pieces. The welding area 230 provides the welding machine 500 with a double-sided welding operating space. The drive mechanism drives the rotating disk 410 to rotate through the drive motor 400, which in turn drives the mounting structure 600 to rotate synchronously, realizing intermittent rotational feeding of the slit grinding discs. The arc-shaped rotating block 620 and the support crossbar 610 in the mounting structure 600 constitute the core support and positioning structure of the grinding discs. The limiting component 650 performs radial positioning of the grinding discs, and the correction arc plate 640 performs circumferential position correction of the grinding discs to ensure accurate slit grinding disc positioning. The side limiting platform 300 drives the clamping plate 350 to move up and down through the electrically controlled push rod 320, and clamps and fixes the end face of the grinding discs at the welding area 230 to prevent displacement of the grinding discs during the welding process. Finally, it works with the welding machine 500 to complete the double-sided welding operation of the slit grinding discs.

[0017] To achieve precise positioning of the grinding disc segments, the radial limiting component 650 and the circumferential correction of the correcting arc plate 640 are combined to solve the misalignment problem during splicing of the segmented grinding discs and improve welding accuracy. The double-sided welding design of the welding zone 230, combined with the intermittent rotation of the rotating disk 410 driven by the drive motor 400, improves welding efficiency and ensures welding uniformity. The end face pressing structure formed by the electrically controlled push rod 320 and the pressing plate 350 of the side limiting stage 300 further improves welding stability, reduces welding deformation, and ensures the overall flatness of the spliced ​​grinding discs. The overall structure of the mounting platform 200, drive mechanism, mounting structure 600, and side limiting stage 300 is reasonably laid out, easy to operate, and adaptable to the splicing needs of different specifications of segmented grinding discs.

[0018] A ring-shaped placement ring 210 is bolted to the upper surface of the mounting platform 200. The inner diameter of the placement ring 210 matches the outer diameter of the small grinding discs to be welded. A rectangular welding area 230 is provided in the middle of the mounting platform 200. The width of the welding area 230 is greater than the width of the weld seam between the grinding discs, facilitating double-sided welding by the welding machine 500 from both the top and bottom of the mounting platform 200. The drive mechanism includes a drive motor 400 fixed below the mounting platform 200. The output shaft of the drive motor 400 is fixedly connected to the rotating disk 410 via a coupling. The drive motor 400 is a stepper motor, which can achieve intermittent rotation, and the rotation angle can be precisely adjusted according to the number of grinding discs. The mounting structure 600 is set inside the placement ring 210, including... Two arc-shaped rotating blocks 620 are bolted to the rotating disk 410. The arc-shaped surfaces of the arc-shaped rotating blocks 620 fit the inner contour of the grinding disc. Each arc-shaped rotating block 620 is welded with a support crossbar 610. A limit component 650 and a correction arc plate 640 are installed on the support crossbar 610. The side limit platform 300 is bolted to the side of the mounting platform 200, corresponding to the welding area 230. The side limit platform 300 includes a fixing frame 310. An electrically controlled push rod 320 is fixedly installed on the fixing frame 310. The output end of the electrically controlled push rod 320 faces downward and is fixedly connected to a clamping plate 350. The clamping plate 350 is made of high-temperature resistant rubber to avoid damaging the surface of the grinding disc. In use, two split grinding discs are placed on the support crossbar 610 inside the placement ring 210. Positioning and correction are completed by the limiting component 650 and the correction arc plate 640. The drive motor 400 drives the rotating disk 410 to rotate, sending the grinding disc weld seam to the welding area 230. The electric control push rod 320 extends, driving the clamping plate 350 to press the end face of the grinding disc. The welding machine 500 performs welding from the top and bottom sides simultaneously. After completing one weld seam, the rotating disk 410 continues to rotate to perform the next welding, until the entire grinding disc splicing is completed.

[0019] As a preferred technical solution, the limiting component 650 includes a magnetic suction platform 651 that is slidably mounted on the support crossbar 610, and a connecting platform 652 is provided above the magnetic suction platform 651; The connecting platform 652 is connected to a retaining plate 654 via a cylinder 653. The retaining plate 654 is used to fit and tighten within the positioning hole of the grinding plate.

[0020] The limiting component 650 is slidably mounted on the support crossbar 610 via the magnetic suction table 651. The position of the magnetic suction table 651 can be adjusted according to the size of the grinding disc pieces to accommodate grinding discs of different specifications. The magnetic suction table 651 can adsorb and assist in positioning metal grinding discs, enhancing positioning stability. The connecting table 652 is fixed on the magnetic suction table 651, and the cylinder 653 is fixed on the connecting table 652. The output end of the cylinder 653 is connected to the clamping plate 654. After the positioning hole of the grinding disc is fitted onto the clamping plate 654, the cylinder 653 extends to drive the clamping plate 654 to expand and tighten, achieving precise positioning of the grinding disc in the radial direction and preventing radial displacement of the grinding disc during welding.

[0021] The magnetic suction table 651, combined with the cylinder 653 and the clamping plate 654, achieves dual radial positioning of the grinding disc, resulting in higher positioning accuracy and stronger stability. The magnetic suction table 651 can slide and adjust on the support crossbar 610 to accommodate grinding discs of different sizes and positioning hole positions, making it highly versatile. The clamping plate 654 uses an expansion-type positioning method, which will not damage the positioning hole of the grinding disc and can ensure that the grinding disc does not shift radially during the welding process, thus guaranteeing the splicing accuracy.

[0022] The limiting component 650 includes a magnetic suction platform 651. A second elongated hole 612 is provided on the support crossbar 610. The magnetic suction platform 651 is slidably installed in the second elongated hole 612 by a slider. A locking bolt is provided between the slider and the second elongated hole 612. After adjustment, it can be locked and fixed. The magnetic suction platform 651 is an electromagnetic chuck. When energized, it can generate magnetism and attract the metal grinding disc to be welded. A connecting platform 652 is welded above the magnetic suction platform 651. A cylinder 653 is fixed on the connecting platform 652 by bolts. The output end of the cylinder 653 faces the grinding disc and is fixedly connected to a pressing plate 654. The pressing plate 654 is made of elastic rubber. Its initial outer diameter is slightly smaller than the inner diameter of the grinding disc positioning hole. When the cylinder 653 extends, the pressing plate 654 is squeezed and tightened, and fits tightly against the inner wall of the grinding disc positioning hole. For each 800mm diameter grinding disc, there is a positioning hole with a diameter of 50mm. Adjust the position of the magnetic suction table 651 in the second elongated hole 612 so that the clamping plate 654 is aligned with the positioning hole of the grinding disc. Place the positioning hole of the grinding disc onto the clamping plate 654, turn on the power to start the magnetic suction table 651 to attract the grinding disc, and then start the cylinder 653 to make the clamping plate 654 tighten the positioning hole, thus completing the radial positioning of the grinding disc. The positioning error can be controlled within ±0.1mm.

[0023] As a preferred technical solution, the corrective arc plate 640 is installed in the first elongated hole 611 of the support crossbar 610 by means of a tension spring 641. The corrective arc plate 640 is used to push the outer edge of the grinding disc so that its inner end is elastically pressed against the arc-shaped rotating block 620.

[0024] The correction arc plate 640 is installed in the first elongated hole 611 of the support crossbar 610 via a tension spring 641. The tension spring 641 is always in a stretched state, generating a pulling force on the correction arc plate 640 toward the arc rotating block 620. After the grinding discs are placed on the support crossbar 610, the correction arc plate 640, under the tension of the tension spring 641, pushes the outer edge of the grinding disc, so that the inner end of the grinding disc elastically abuts against the arc surface of the arc rotating block 620, thereby correcting the circumferential position of the grinding disc and ensuring that the circumferential contours of the multiple grinding discs are consistent and the joints are tightly fitted.

[0025] The elastic clamping circumferential correction structure formed by the correction arc plate 640 and the tension spring 641 can ensure accurate circumferential positioning of the grinding disc and avoid damage to the surface of the grinding disc caused by rigid contact. The elastic effect of the tension spring 641 can adapt to the small dimensional errors of the grinding disc segments and improve the adaptability of positioning.

[0026] A first elongated hole 611 is provided on the support crossbar 610, and the first elongated hole 611 is set along the length direction of the support crossbar 610. One end of the correction arc plate 640 is connected to the end of the first elongated hole 611 through a tension spring 641. The tension spring 641 is a stainless steel spring with an initial tension of 5mm and a spring force of 100N. The arc surface of the correction arc plate 640 fits the outer edge contour of the grinding disc, and the arc surface is provided with a wear-resistant coating. When the two split grinding discs are placed on the support crossbar 610, the correction arc plate 640 moves towards the arc rotating block 620 under the tension of the tension spring 641, pushing the outer edge of the grinding disc, so that the inner end of the grinding disc is tightly pressed against the arc surface of the arc rotating block 620.

[0027] As a preferred technical solution, the rotating disk 410 has a mounting groove 420 on its side wall, the arc-shaped rotating block 620 is rotatably disposed in the mounting groove 420, and the circumferential distance between the two arc-shaped rotating blocks 620 is adjustable.

[0028] The rotating disk 410 has a mounting groove 420 on its side wall. The arc-shaped rotating block 620 is rotatably mounted in the mounting groove 420 via a rotating shaft, allowing the arc-shaped rotating block 620 to slide along the length of the mounting groove 420. By adjusting the position of the two arc-shaped rotating blocks 620 in the mounting groove 420, the circumferential distance between the two arc-shaped rotating blocks 620 is changed, thereby adapting to grinding discs of different sizes and quantities (two or three discs). This ensures that the arc-shaped rotating block 620 can accurately fit with the inner end of the grinding disc, providing stable support and positioning for the grinding disc.

[0029] The circumferential spacing of the arc-shaped rotating block 620 within the mounting groove 420 of the rotating disk 410 is adjustable, which greatly improves the versatility of the device and can be adapted to the welding of multiple grinding discs with different segmentation methods.

[0030] As a preferred technical solution, a rolling ball 630 is provided below the end of the support crossbar 610 away from the arc-shaped rotating block 620, and a rotating guide rail 220 corresponding to the trajectory of the rolling ball 630 is provided on the upper surface of the mounting platform 200.

[0031] A rolling ball 630 is installed below the end of the support crossbar 610 away from the arc-shaped rotating block 620. The upper surface of the mounting platform 200 is provided with an annular rotating guide rail 220 corresponding to the movement trajectory of the rolling ball 630. When the drive motor 400 drives the rotating disk 410 to rotate, the support crossbar 610 rotates synchronously with the rotating disk 410, and the rolling ball 630 rolls along the rotating guide rail 220 to provide auxiliary support for the support crossbar 610, reduce the deflection of the end of the support crossbar 610 away from the arc-shaped rotating block 620, avoid the support crossbar 610 from bending and deforming due to the weight of the grinding disc, ensure that the grinding disc always remains horizontal during rotation, and guarantee positioning accuracy and welding stability.

[0032] As a preferred technical solution, the side limiting platform 300 further includes a fixing frame 310, an upper mounting platform 330 installed at the output end of the electric control push rod 320, and a cross frame 340 connected below the upper mounting platform 330. The clamping plate 350 is disposed at the bottom of the cross frame 340 and located directly above the welding area 230.

[0033] The fixing frame 310 of the side limiting stage 300 is fixed to the side of the mounting platform 200, providing support for the entire side limiting structure; the electric control push rod 320 is fixed on the fixing frame 310, the upper mounting platform 330 is fixed to the output end of the electric control push rod 320, the cross frame 340 is connected below the upper mounting platform 330, and the clamping plate 350 is set at the bottom of the cross frame 340 and located directly above the welding area 230; when the grinding disc rotates to the welding area 230, the electric control push rod 320 extends, driving the upper mounting platform 330 and the cross frame 340 to move downwards synchronously, thereby driving the clamping plate 350 to move downwards and press against the end face of the grinding disc, so as to fix the grinding disc at the end face of the welding area 230 and prevent the grinding disc from axially displacing during the welding process; after welding is completed, the electric control push rod 320 retracts, driving the clamping plate 350 to move upwards, releasing the grinding disc, so that the rotating disk 410 can drive the grinding disc into the next process.

[0034] As a preferred technical solution, it includes a support cover 120 that supports the installation platform 200, an exhaust fan 121 on the side of the support cover 120, and an inner protective cover 130 inside the support cover 120.

[0035] The support cover 120 is fixed below the installation platform 200, providing stable support for the installation platform 200 and other components, and ensuring the structural stability of the entire device. The exhaust fan 121 installed on the side of the support cover 120 is activated during the welding process to draw the welding fumes and harmful gases into the support cover 120 and then discharge them to the external treatment equipment through the exhaust fan 121 to prevent the spread of harmful gases. The inner protective cover 130 inside the support cover 120 can protect the internal components such as the drive motor 400, preventing sparks and welding slag generated during the welding process from splashing onto the internal components and causing damage.

[0036] On the other hand, the present invention also provides a process for welding and assembling grinding discs using a disc-shaped tooling for positioning, comprising the following steps: S1. Segmented design: Based on the risk of casting deformation of large-sized grinding discs, they are divided into two or three independent small grinding discs for segmented casting. S2. Tooling simulation positioning: Make a positioning tooling disc that simulates the size and layout of the mounting holes on the bottom plate of the grinding mill. Lock the small grinding disc to be welded onto the positioning tooling disc through its own positioning holes. S3. Pre-treatment of welding bevel: Plan the welding point at the welding part between adjacent small grinding discs, and grind the welding edge to form a welding bevel; S4. Double-sided spot welding fixation: Under the constraint of the positioning tooling disc, multi-point symmetrical spot welding is performed on adjacent small grinding discs; S5. Assembly verification and finishing: Using the positioning tooling disc as a verification platform, the welded grinding disc assembly is assembled, verified, shaped and surface-processed.

[0037] By adopting a modular approach, the large grinding disc is broken down into two or three smaller discs for separate casting, reducing the casting difficulty and deformation risk of individual discs. A positioning fixture disc, with dimensions and layout identical to the mounting holes on the grinding disc base plate of the refiner, provides a precise positioning reference for the smaller discs, ensuring accurate fit between the assembled discs and the refiner. Pre-treatment of the welding bevels improves welding quality. Multi-point symmetrical spot welding reduces welding deformation. Finally, using the positioning fixture disc as a verification platform, the welded grinding disc assembly is assembled, shaped, and surface-machined to ensure dimensional accuracy and surface quality, meeting usage requirements.

[0038] S1. Segmented Design: For large grinding discs with a diameter of 1200mm and a thickness of 50mm, which are prone to warping and deformation during casting, the disc is split into two independent smaller grinding discs for separate casting. Each smaller grinding disc has a central angle of 180° and a thickness of 50mm, consistent with the original disc. S2. Tooling Simulation and Positioning: A positioning tooling disc is fabricated with a diameter matching the grinding disc base plate of the refiner (1200mm). The mounting holes on the disc are identical in size and layout to those on the grinding disc base plate. The two smaller grinding discs to be welded are bolted to the positioning tooling disc through their self-positioning holes, ensuring the position of the smaller grinding discs matches the actual installation position. S3. Welding Beveling Pre-treatment: Welding points are planned at the joint of the two smaller grinding discs. The welding points are evenly distributed along the weld seam. The welding edges are ground at a 45° angle to form a V-shaped welding groove with a depth of 5mm. Oxide scale and oil stains on the welding edges are removed to ensure welding quality. S4, Double-sided spot welding fixation: Under the constraint of the positioning fixture disc, argon arc welding is used to perform multi-point symmetrical spot welding on adjacent small grinding discs. The welding current is 150A and the welding time is 2s / point to ensure the weld is firm. S5, Assembly verification and repair: Using the positioning fixture disc as a verification platform, the welded grinding disc assembly is assembled and verified around the entire circle on the positioning fixture disc. The gap and circumferential error at the splicing point are checked. The parts with deviations are shaped. Then, the grinding disc tooth surface is milled to ensure the flatness and dimensional accuracy of the tooth surface, and finally, a large-size grinding disc that meets the requirements is obtained.

[0039] As a preferred technical solution, the sharding design in step S1 follows the following rules: The rack at the segmentation point should be kept as continuous as possible; If the rack is interrupted at the segment, the interruption distance must be greater than the width of the tooth groove; If the length of the toothed rack at the four corners of the small grinding disc after splitting is lower than the set threshold, the toothed rack will be thickened or removed directly.

[0040] During the design of grinding disc segments, the principle of prioritizing continuous racks is followed to avoid interruptions in the racks at the segmentation points, ensuring that the transmission and grinding performance of the racks are not affected after the grinding discs are spliced. If interruptions in the racks at the segmentation points are unavoidable, the interruption spacing is controlled to be greater than the tooth groove width to prevent problems such as jamming and poor meshing of the racks after splicing. If the rack length at the four corners of the small grinding disc after segmentation is lower than the set threshold, it indicates that the rack strength in that part is insufficient and prone to wear and breakage. Therefore, the rack is thickened or removed directly to ensure the reliability of the grinding discs.

[0041] The segmentation design in step S1 follows these specific rules: For large-size grinding discs with racks, the rack pitch is 10mm and the groove width is 5mm. When segmenting, priority is given to splitting the racks at continuous sections to avoid interruptions. If the rack cannot be interrupted at the segmentation due to the size limitations of the grinding disc, the interruption distance is controlled to 8mm, which is greater than the groove width of 5mm, to ensure smooth meshing of the racks after splicing without jamming. A rack length threshold of 20mm is set. If the rack length at the four corners of the segmented small grinding disc is 15mm, which is lower than the set threshold, the rack in that area is thickened, increasing the rack thickness from 8mm to 12mm to improve the rack strength. If the rack length at the four corners of the segmented small grinding disc is only 10mm, and the strength requirement cannot be met by thickening, the rack in that area is removed to prevent rack breakage during use and to avoid affecting the normal operation of the grinding disc.

[0042] As a preferred technical solution, the spot welding point placement principle in step S4 is as follows: Welding points should be preferably selected in the gaps within the small grinding disc sector; Three welding points are set on the front and bottom surfaces of the weld seam, and one welding point is set on the inner and outer rings of the grinding disc.

[0043] When spot welding, prioritize the gaps in the small grinding disc sector to avoid damaging critical working parts such as the grinding disc's rack during the spot welding process. Set three welding points on the front and bottom surfaces of the weld seam to ensure the symmetry and uniformity of the weld, reduce welding stress, and prevent welding deformation of the grinding disc. At the same time, set one welding point on the inner and outer rings of the grinding disc to further enhance the welding fixation effect, ensure that the two small grinding discs are tightly spliced, and avoid problems such as loosening or displacement after welding.

[0044] The specific implementation of the spot welding placement principle in step S4 is as follows: For two-piece grinding discs with a weld seam length of 800mm, spot welding should prioritize the gaps in the smaller grinding disc's sector without toothed sections. On the front side of the weld seam, three weld spots are evenly placed along the weld seam length, with a spacing of 260mm, located at 1 / 4, 1 / 2, and 3 / 4 of the weld seam, respectively. On the bottom side of the weld seam, three weld spots are also placed corresponding to the front weld spots to ensure symmetry. Simultaneously, one weld spot is placed at the weld seam location, 400mm from the center of the inner ring and 580mm from the center of the outer ring, for a total of 8 weld spots. Argon arc welding is used for spot welding, with a welding current of 140A, a welding time of 2s per spot, and a weld spot diameter of 8mm. After welding, the weld spots are firm, the weld seam gap is controlled within 0.2mm, and there is no obvious welding deformation.

[0045] As a preferred technical solution, the surface processing in step S5 includes the final milling, turning or grinding of the welded grinding disc tooth surface on the positioning tooling disc.

[0046] In step S5, the welded grinding disc assembly remains fixed on the positioning fixture disc, using the positioning fixture disc as a reference to ensure the positioning accuracy of the grinding disc during surface processing. According to the usage requirements of the grinding disc, the welded grinding disc tooth surface is subjected to final milling, turning, or grinding to remove weld points and burrs generated during the welding process, correct the dimensional errors and flatness of the tooth surface, so that the grinding disc tooth surface meets the design requirements, ensuring the grinding performance and adaptability of the grinding disc.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grinding disc segmentation and welding device for positioning with a disc tool, characterized in that, It includes an installation platform (200) on which a placement ring (210) is provided, and a welding area (230) is provided on the installation platform (200) for double-sided welding by a welding machine (500). The drive mechanism includes a drive motor (400) disposed below the mounting platform (200) and a rotating disk (410) driven therefrom. The mounting structure (600), disposed within the placement ring (210), includes an arc-shaped rotating block (620) connected to the rotating disk (410) and a support crossbar (610) connected to the arc-shaped rotating block (620). The support crossbar (610) is provided with a limiting component (650) for radial positioning of the slit grinding discs and a correction arc-shaped plate (640) for circumferential correction. A side limiting stage (300) is fixed to the side of the mounting platform (200) and includes an electrically controlled push rod (320) and a clamping plate (350) driven by it to move up and down, for fixing the end face of the grinding disc at the welding area (230).

2. The grinding disc segmentation and welding device for positioning with a disc tooling according to claim 1, characterized in that, It also includes a limiting component (650), which includes a magnetic platform (651) slidably mounted on the support crossbar (610), and a connecting platform (652) is provided above the magnetic platform (651). The connecting platform (652) is connected to a clamping plate (654) via a cylinder (653). The clamping plate (654) is used to fit and tighten inside the positioning hole of the grinding plate.

3. The grinding disc segmentation and welding device for positioning with a disc tooling according to claim 2, characterized in that, The corrected arc plate (640) is installed in the first elongated hole (611) of the support crossbar (610) by means of a tension spring (641); The corrective arc plate (640) is used to push the outer edge of the grinding disc so that its inner end is elastically pressed against the arc rotating block (620).

4. The grinding disc segmentation and welding device for positioning with a disc tooling according to claim 1, characterized in that, The rotating disk (410) has an installation groove (420) on its side wall. The arc-shaped rotating block (620) is rotatably disposed in the installation groove (420), and the circumferential distance between the two arc-shaped rotating blocks (620) is adjustable.

5. The grinding disc segmentation and welding device for positioning with a disc tooling according to claim 4, characterized in that, A rolling ball (630) is provided below the end of the support crossbar (610) away from the arc-shaped rotating block (620), and a rotating guide rail (220) corresponding to the trajectory of the rolling ball (630) is provided on the upper surface of the mounting platform (200).

6. The grinding disc segmentation and welding device for positioning with a disc tooling according to claim 5, characterized in that, The side limiting platform (300) also includes a fixing frame (310), an upper mounting platform (330) installed at the output end of the electric control push rod (320), and a cross frame (340) connected below the upper mounting platform (330). The clamping plate (350) is located at the bottom of the cross frame (340) and directly above the welding area (230).

7. The grinding disc segmentation and welding device for positioning a disc tooling according to claim 5, characterized in that, It also includes a support and exhaust system, which includes a support cover (120) supporting the mounting platform (200), an exhaust fan (121) on the side of the support cover (120), and an inner protective cover (130) inside the support cover (120).

8. A grinding disc segmentation and welding process for positioning with a disc fixture, applicable to the grinding disc segmentation and welding device for positioning with a disc fixture as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Segmented design: Based on the risk of casting deformation of large-sized grinding discs, they are divided into two or three independent small grinding discs for segmented casting. S2. Tooling simulation positioning: Make a positioning tooling disc that simulates the size and layout of the mounting holes on the bottom plate of the grinding mill. Lock the small grinding disc to be welded onto the positioning tooling disc through its own positioning holes. S3. Pre-treatment of welding bevel: Plan the welding point at the welding part between adjacent small grinding discs, and grind the welding edge to form a welding bevel; S4. Double-sided spot welding fixation: Under the constraint of the positioning tooling disc, multi-point symmetrical spot welding is performed on adjacent small grinding discs; S5. Assembly verification and finishing: Using the positioning tooling disc as a verification platform, the welded grinding disc assembly is assembled, verified, shaped and surface-processed.

9. The grinding disc segment welding process for positioning with a disc tooling according to claim 8, characterized in that, The fragmentation design steps described in step S1 include: The rack at the segmentation point should be kept as continuous as possible; If the rack is interrupted at the segment, the interruption distance must be greater than the width of the tooth groove; If the length of the toothed rack at the four corners of the small grinding disc after splitting is lower than the set threshold, the toothed rack will be thickened or removed directly.

10. The grinding disc segment welding process for positioning with a disc tooling according to claim 8, characterized in that, The spot welding step described in step S4 is as follows: Welding points should be preferably selected in the gaps within the small grinding disc sector; Three weld points are provided on both the front and bottom surfaces of the weld joint, and one weld point is provided on both the inner and outer rings of the grinding disc; and / or The surface processing described in step S5 includes the final milling, turning or grinding of the welded grinding disc tooth surface on a positioning tooling disc.

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