Tool for installing and welding frame grating and working method

Abstract

The invention relates to a welding tool for installing and welding a frame grille and a working method. The welding tool comprises a tool base, a plurality of fixing holes, a plurality of connecting rods and a plurality of connecting rods, wherein the upper surface and the side face of the tool base are each provided with a plurality of fixing holes distributed in an array mode; the positioning angle square comprises a fixing part and a positioning part vertically arranged at one end of the fixing part, the fixing part is provided with a long-strip-shaped hole, and the positioning part is used for being connected with a grating bar to be welded in an abutting mode; the fixing piece is matched with the long-strip-shaped hole and the fixing hole, and the fixing part of the positioning angle square can be fixedly connected with the tool base through the long-strip-shaped hole, the fixing hole and the fixing piece; the shape of the sample plate is matched with that of a grating welding piece, and the sample plate is used for being placed on the tool base so as to position the positioning angle square. By the adoption of the welding tool, the requirement for installing and welding the frame gratings of different vehicle types is met.

Description

Technical Field

[0001] This invention relates to the field of bus frame grille welding technology, specifically to a tooling and working method for welding bus frame grilles. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] With the development of the bus industry, the market demand for diversified and customized bus products is increasing. Bus models of different lengths and structural forms are emerging in large numbers, ranging from 7 to 12 meters in length, and including various structural forms such as monocoque, semi-monocoque, and split-frame designs. This complexity of models and structures directly leads to the diversification of bus frames and their components. Among these, the grille assembly, as an important functional structural component at the front of the frame, comes in many varieties, with significant differences in size, structure, and installation interfaces. This diversity not only increases the difficulty of management and scheduling during the production process but also places higher demands on welding processes and precision control.

[0004] In traditional chassis grille assembly and welding production, due to the wide variety of individual grille components, specialized positioning tooling is typically designed and manufactured for each vehicle model and structure. Whenever the production model changes, traditional tooling often needs to be redesigned and remanufactured, resulting in long lead times, high costs, and significant workshop resource consumption, severely hindering production flexibility and efficiency. This is especially true in the highly customized bus production scenario, where tooling manufacturing and replacement frequencies are extremely high, making it difficult for traditional tooling to meet the demands of rapid changeover and multi-model adaptation. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a welding fixture and working method for welding the frame grille assembly, which meets the needs of rapid switching and adaptation to multiple vehicle models.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: An embodiment of the present invention provides a welding fixture for welding a vehicle frame grille assembly, comprising: Tooling base: Multiple fixing holes are arranged in an array on its upper surface and sides; Positioning angle ruler: includes a fixing part and a positioning part vertically set at one end of the fixing part, wherein the fixing part is provided with an elongated hole, and the positioning part is used to abut against the grid strip to be welded; Fasteners: Matching the elongated holes and fixing holes, the fixing part of the positioning angle ruler can be fixedly connected to the tooling base through the elongated holes, fixing holes and fasteners; Template: Matches the shape of the grating weldment and is used to place it on the tooling base for positioning with the positioning square.

[0007] Optionally, the length of the elongated hole is greater than the sum of the distance between two adjacent fixing holes on the working base and the diameter of the fixing hole.

[0008] Optionally, the thickness of the fixing part and the positioning part of the positioning angle ruler is 23mm-27mm, preferably 25mm.

[0009] Optionally, the tooling base is made of nitrided steel plate with a thickness of 23mm-27mm, preferably 25mm.

[0010] Optionally, the template can be made from steel plates processed by laser cutting.

[0011] Optionally, the thickness of the sample is 1.5mm-2.5mm, preferably 2mm.

[0012] Optionally, the fastener is a fixing bolt, and correspondingly, the fixing hole is a threaded hole.

[0013] Optionally, the fixing hole is a smooth hole, and the fixing component includes a sleeve that can be inserted into the fixing hole, an ejector drive component, and steel balls. The bottom end of the sleeve is provided with an inverted conical structure. The sleeve wall above the inverted conical structure is provided with a plurality of steel ball receiving holes at equal intervals along the circumferential direction for accommodating steel balls. Along the direction from the inner side of the sleeve to the outer side, the steel ball receiving holes are shrinkage holes. The ejector drive component includes a push rod. The bottom end of the push rod is provided with a push rod that can be threaded to the sleeve. The bottom end of the push rod is provided with a drive rod. The diameter of the drive rod is smaller than the diameter of the push rod. A conical transition rod is provided between the drive rod and the push rod.

[0014] Optionally, the tooling base is fixedly connected to the top of multiple legs, the bottom of the legs is used to cooperate with the ground foundation, and the legs support the tooling base.

[0015] Secondly, embodiments of the present invention provide a method for operating the welding fixture for welding a vehicle frame grille assembly as described in the first aspect, comprising the following steps: Select a template that matches the grating to be welded; Place the template on the upper surface of the tooling base; Multiple positioning angle rulers are placed on the tooling base. The fixing part of the positioning angle ruler is placed on the tooling base, and its positioning part is in contact with the side edge of the template. Each plate part of the template corresponding to the grid strip is provided with at least one positioning angle ruler. After the positioning angle ruler is placed, the fixing part is fixedly connected to the tooling base through the elongated hole of the fixing part, the fixing hole opened in the working base, and the fastener; Remove the template from the fixture base, and then place the multiple grid strips to be welded on the upper surface of the fixture base. The grid strips should fit against the positioning part of the corresponding positioning angle ruler, and the positioning angle ruler should be used for positioning. Multiple grid strips are welded together to form a grid welded component.

[0016] The beneficial effects of this invention are as follows: The welding fixture and working method of the present invention, because the fixture base is provided with multiple fixing holes arranged in an array, the fixing part of the positioning angle ruler can cooperate with different fixing holes, thereby realizing the position adjustment of the positioning angle ruler on the fixture base. With the work of the template, the position of the positioning angle ruler on the fixture base can be matched with the grid welding part to be welded, so that multiple positioning angle rulers can be positioned for the grid bars to be welded. Since the fixing holes are arranged in an array, the positioning angle ruler can be adjusted in position using the template that matches the grid welding part to be welded, so as to meet the requirements of the corresponding grid welding part. This satisfies the welding requirements of multiple grid welding parts with the same welding fixture, which can significantly shorten the fixture changeover time, reduce manual adjustment and repetitive manufacturing links, and improve the response speed and production efficiency of the production line. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 This is a top view of the tooling base supporting the grid strip in Embodiment 1 of the present invention; Figure 2 This is a front view of the tooling base supporting the grid strip in Embodiment 1 of the present invention; Figure 3 This is a top view of the template in Embodiment 1 of the present invention; Figure 4 This is an exploded view of the fastener structure in Embodiment 1 of the present invention; The components include: 1. tooling base, 2. template, 3. positioning square, 4. fasteners, 5. grid strips, and 6. support legs. 401. Sleeve, 402. Steel ball, 403. Inverted conical structure, 404. Steel ball receiving hole, 405. Push rod, 406. Rotating head, 407. Drive rod, 408. Transition rod. Detailed Implementation

[0019] Example 1 This embodiment provides a welding fixture for welding vehicle frame grille assemblies, such as... Figures 1-3As shown, it includes a tooling base 1, a template 2, multiple positioning angle rulers 3, and multiple fasteners 4. Multiple templates 2 are provided, and each template 2 corresponds to a different type of grid welding part, that is, each type of grid welding part is provided with a template 2.

[0020] The tooling base 1 is made of nitrided steel plate, which is rectangular with a thickness of 23mm-27mm, preferably 25mm. Nitrided steel plate possesses excellent wear resistance, surface hardness, and structural rigidity, enabling it to maintain dimensional stability and service life during long-term high-intensity welding operations. The nitriding process, where the steel plate surface is nitrided, enhances its resistance to wear and welding spatter, reduces the frequency of routine maintenance, and ensures long-term reliable operation of the tooling.

[0021] Multiple fixing holes are provided on the upper surface and four sides of the nitrided steel plate. The multiple fixing holes are arranged in an array. In this embodiment, the multiple fixing holes on the upper surface of the nitrided steel plate are arranged in a rectangular array, and the rectangle covers the entire upper surface of the nitrided steel plate.

[0022] The multiple fixing holes on the side surface of the nitrided steel plate are arranged in an array. In this embodiment, the multiple fixing holes on the side surface of the nitrided steel plate are arranged in a rectangular array, and the rectangle covers the entire side surface of the nitrided steel plate.

[0023] By rationally designing the aperture and spacing, flexible positioning of grille welding parts of different specifications can be achieved on the same tooling, so that the tooling base 1 can simultaneously adapt to the welding requirements of grille welding parts of multiple vehicle models and multiple sizes. In this embodiment, the fixing hole adopts a circular hole with a diameter of 25mm, and the distance between the centers of adjacent fixing holes, i.e., the hole spacing, is strictly controlled to be 100mm.

[0024] The number of positioning angle rulers 3 can be set according to actual needs, and will not be described in detail here. In this embodiment, the positioning angle ruler 3 adopts an L-shaped structure, including a fixing part and a positioning part that is vertically fixed to one end of the fixing part.

[0025] The fixing part is used to fix and connect with the tooling base 1, and the positioning part is used to abut against the grid strip of the grid welding part to be welded, and to position the grid strip.

[0026] In this embodiment, in order to ensure the stability of the positioning part abutting against the grid strip, the thickness of the positioning part is 23mm-27mm, preferably 25mm. Correspondingly, the thickness of the fixing part is the same as that of the positioning part, which is also 23mm-27mm, preferably 25mm.

[0027] like Figure 4As shown, the fixing member 4 includes a sleeve 401, an ejection drive member, and multiple steel balls 402. The sleeve 401 can be inserted into the fixing hole. The bottom end of the sleeve 401 is provided with an inverted conical structure 403 so that the bottom end of the sleeve 401 has an inverted conical cavity. Multiple steel ball receiving holes 404 are equally spaced along the circumference of the sleeve on the sleeve wall above the inverted conical structure. The number of steel ball receiving holes 404 is equal to the number of steel balls 402. Along the direction from the inside to the outside of the sleeve 401, the steel ball receiving holes 404 adopt a tapering hole, that is, the area of ​​the opening formed by the steel ball receiving hole 404 extending to the inner side of the sleeve 401 is larger than the area of ​​the opening extending to the inner side of the sleeve 401. The area of ​​the opening formed on the outer side of sleeve 401, and the adjacent steel column receiving holes 404 extending to the opening formed on the inner side of sleeve 401 are interconnected so that steel balls 402 can enter the corresponding steel ball receiving holes 404. The ejection drive includes a push rod 405. The outer rod surface of the push rod 405 is provided with an external thread section, which can extend into sleeve 401 and be threadedly connected to sleeve 401 through the external thread section. The outer end of the push rod 405 is provided with a rotating head 406, and its inner end is coaxially provided with a driving rod 407. The diameter of the driving rod 407 is smaller than the diameter of the push rod 405. A tapered transition rod 408 is provided between the driving rod 407 and the push rod 405.

[0028] In this embodiment, when the fastener is in use, multiple steel balls 402 are placed into the sleeve 401, and the steel balls 402 fall into the conical cavity at the bottom of the sleeve 401. Then, the sleeve 401 is placed into the corresponding fixing hole, and then the push rod 405 is inserted into the sleeve 401. The push rod 405 is rotated, and the push rod 405 is threadedly connected to the sleeve 401. The push rod 405 moves downward, and under the squeezing action of the drive rod 407 and the transition rod 408, multiple steel balls 402 enter the corresponding steel ball receiving hole 404. As the push rod 405 moves downward, the steel balls 404 move towards the outside of the sleeve 401 until the steel balls 402 abut against the hole wall of the fixing hole, thereby locking the entire fastener in the fixing hole.

[0029] This method of fastening allows for the clamping and disassembly of the positioning square 3 within seconds, saving manual operation time and ensuring positioning stability and repeatability during high-frequency welding. The fastener 4 can be flexibly switched between different hole positions, ensuring accurate and deviation-free workpiece positioning after each tightening, avoiding welding errors caused by loosening or positional deviation. Simultaneously, this design balances mechanical precision and operational convenience, significantly improving tooling operation efficiency and production flexibility, meeting the needs of multi-model, multi-batch production.

[0030] The fixing part is provided with an elongated hole, the length direction of which is the length direction of the fixing part. The length of the elongated hole is greater than the sum of the distance between adjacent fixing holes and the diameter of the fixing hole. With this setting, when the positioning angle ruler 3 is placed on the top of the tooling base 1 to position the grid strip 5, there will always be a fixing hole corresponding to the elongated hole, so as to realize the fixed connection between the fixing part and the tooling base 1.

[0031] In this embodiment, the length of the elongated hole is 150mm.

[0032] The template 4 is made of steel plate with a thickness of 1.5mm-2.5mm, preferably steel plate with a thickness of 2mm. The size and shape of the template 4 are exactly the same as the size and shape of the corresponding grid welded part. It is made by replicating the grid welded part at a 1:1 ratio. In this embodiment, the template 4 is made by laser cutting process. The template 4 is composed of multiple strips connected in one piece. Each strip corresponds to one grid strip 5 in the grid welded part.

[0033] Template 4 serves as a reference when installing the positioning ruler 3 on the tooling base 1, enabling the positioning ruler 3 to be quickly positioned without relying on manual measurement to determine its position.

[0034] The laser-cut template 4 features high-precision edges and reusability, allowing for rapid switching when welding different grid components while ensuring assembly position matches the design. Using template 4 to position the positioning ruler 3 not only improves work efficiency but also reduces manual operation errors and repetitive measurement workload, shortening measurement and adjustment time. It provides a stable, efficient, and flexible positioning solution for the production line, significantly optimizing the production process and assembly accuracy.

[0035] The bottom surface of the tooling base 1 is fixedly connected to the top of multiple support legs 6. The bottom end of the support legs 6 is in contact with the ground foundation. The support legs support the tooling base. Preferably, a support leg 6 is provided at the middle and both ends of the long edge of the bottom surface of the tooling base 1.

[0036] Example 2 This embodiment provides a working method for the welding fixture for welding vehicle frame grilles as described in Embodiment 1, including the following steps: Step 1: Select a template 4 that corresponds to the grid welding part to be welded. The template 4 is composed of multiple strips connected in one piece, and each strip corresponds to one grid strip 5 in the grid welding part.

[0037] Step 2: Place the selected template 4 on the upper surface of the tooling base 1.

[0038] Step 3: Place the positioning angle ruler 3 on the tooling base 1, and make the positioning part of the positioning angle ruler 3 abut against the template 4. Multiple positioning angle rulers 3 are set, and each strip of the template 4 abuts against the positioning parts of at least two positioning angle rulers 3.

[0039] The number of positioning angle rulers 3 corresponding to each strip and the abutment position of the positioning angle rulers 3 on the strip can be set according to actual needs, and will not be described in detail here. After the positioning angle rulers 3 are positioned on the tooling base 1, the fixing parts of multiple positioning angle rulers 3 are fixedly connected to the tooling base 1 through the fixing parts 4, the elongated holes and the fixing holes.

[0040] Specifically, after the sleeve 401 is passed through the elongated hole of the fixing part, it is placed into the fixing hole. Then, the push rod 405 is inserted into the sleeve 401. The push rod 405 is rotated by the rotating head 406. Since the push rod 405 is threadedly connected to the sleeve 401, the push rod 405 moves downward. The drive rod 407 drives the steel ball 402 into the corresponding steel ball receiving hole 404, and the steel ball 402 abuts against the hole wall of the fixing hole, locking the entire fixing part 4 to the fixing hole. At the same time, the rotating head 406 presses the fixing part against the upper surface of the tooling base 1.

[0041] Step 4: Remove template 4 from fixture base 1, and then place multiple welded and assembled grid strips 5 on the upper surface of fixture base 1. The grid strips 5 abut against the positioning part of the corresponding positioning angle ruler 3, thereby realizing the positioning of multiple grid strips 5.

[0042] Step 5: Weld and fix multiple grid strips 5 to complete the welding of the grid welded parts.

[0043] Step 6: Loosen the fastener 4, remove the positioning angle ruler 3 from the tooling base 1, and then take out the welded grating welding part.

[0044] The welding fixture used in this embodiment features standardized fixing holes on the fixture base 1, along with a positioning square 3, a fixing component 4, and a template 4, enabling flexible positioning and rapid switching of the grille bars 5 in the grille weldment. Operators do not need to rely on traditional manual measurement during production; they only need to select the appropriate installation position based on the fixing holes, positioning square 3, and template 4 to complete the positioning and welding of single or multiple grille weldment units. This efficient operation significantly reduces waiting and adjustment time caused by fixture switching during production, and also improves the overall production line efficiency, enabling rapid response to multi-model and multi-specification production tasks, meeting the needs of flexible production.

[0045] The welding fixture used in this embodiment allows a single set of fixtures to adapt to the welding needs of multiple models and specifications of grille weldments. There is no need to redesign or manufacture dedicated fixtures for each type of grille weldment; positioning of different grille weldments can be completed simply by switching the hole positions of the fixing holes and adjusting the template. This modular and standardized design significantly improves the reusability of the fixtures, reduces the cost of manufacturing new fixtures and resource consumption, and also reduces warehousing and management pressure. The high versatility of the welding fixtures is not only suitable for current vehicle production but also allows for flexible responses to future customized or new vehicle production needs, enabling continuous flexible upgrades to the production line and ensuring the economy and ease of operation for enterprises in multi-vehicle production environments.

[0046] The upper surface of the working base 1 supports the grille strips 5, ensuring that key dimensions such as installation position, flatness, side flatness, and overhang of each grille weldment remain consistent during the welding process. The fixing component 4 ensures the secure fixation of the positioning square 3, preventing errors caused by vibration or misalignment. The fixing component 4 can lock and release in seconds, significantly shortening the tooling installation and disassembly time. Through this precise control, the welded grille weldments maintain a high degree of consistency regardless of their position on the same tooling or in different batches of welding operations, ensuring precise alignment with subsequent frame assembly and the overall vehicle structure. This precision assurance not only reduces rework and repair rates but also improves the overall quality and reliability of vehicle manufacturing, providing a stable data and operational foundation for intelligent production.

[0047] The welding fixture adopted in this embodiment, through the organic combination of fixing holes, positioning squares 3, fixing parts 4, and templates 4, achieves a high degree of flexibility, supporting rapid switching between different specifications of grille welding parts on the same fixture, greatly improving the adaptability and intelligence level of the production line. The standardized operation process reduces manual measurement and adjustment steps, lowering the risk of human error. Simultaneously, the setting of fixing parts 4 ensures high stability and safety of the fixture, guaranteeing not only production efficiency and welding accuracy but also enhancing the overall safety of the production site, providing reliable technical support and safe production conditions for the flexible manufacturing of modern bus frames.

[0048] Example 3 This embodiment provides a tooling for welding a vehicle frame grille assembly. Compared with Embodiment 1, the only difference is that the fixing part uses a fixing bolt. Correspondingly, the fixing hole is a threaded hole. In use, the fixing bolt passes through the elongated hole and is threadedly connected to the fixing hole. The head of the fixing bolt presses the fixing part against the upper surface of the tooling base 1. The rest of the structure of this embodiment is the same as that of Embodiment 1, and will not be described again here.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A welding fixture for welding vehicle frame grilles, characterized in that, include: Tooling base: Multiple fixing holes are arranged in an array on its upper surface and sides; Positioning angle ruler: includes a fixing part and a positioning part vertically set at one end of the fixing part, wherein the fixing part is provided with an elongated hole, and the positioning part is used to abut against the grid strip to be welded; Fasteners: Matching the elongated holes and fixing holes, the fixing part of the positioning angle ruler can be fixedly connected to the tooling base through the elongated holes, fixing holes and fasteners; Template: Matches the shape of the grating weldment and is used to place it on the tooling base for positioning with the positioning square.

2. The welding fixture for welding vehicle frame grilles as described in claim 1, characterized in that, The length of the elongated hole is greater than the sum of the distance between two adjacent fixed holes on the working base and the diameter of the fixed hole.

3. The welding fixture for welding vehicle frame grilles as described in claim 1, characterized in that, The thickness of the fixing part and the positioning part of the positioning angle ruler is 23mm-27mm, preferably 25mm.

4. The welding fixture for welding vehicle frame grilles as described in claim 1, characterized in that, The tooling base is made of nitrided steel plate with a thickness of 23mm-27mm, preferably 25mm.

5. The welding fixture for welding vehicle frame grilles as described in claim 1, characterized in that, The template is made of steel plate processed by laser cutting.

6. The welding fixture for welding vehicle frame grilles as described in claim 1, characterized in that, The thickness of the sample is 1.5mm-2.5mm, preferably 2mm.

7. The welding fixture for welding vehicle frame grilles as described in claim 1, characterized in that, The fastener is a fixing bolt, and correspondingly, the fixing hole is a threaded hole.

8. The welding fixture for welding vehicle frame grilles as described in claim 1, characterized in that, The fixing hole is a smooth hole. The fixing component includes a sleeve that can be inserted into the fixing hole, an ejector drive component, and steel balls. The bottom end of the sleeve is provided with an inverted conical structure. The sleeve wall above the inverted conical structure is provided with a plurality of steel ball receiving holes at equal intervals along the circumferential direction for accommodating steel balls. Along the direction from the inner side of the sleeve to the outer side, the steel ball receiving holes are shrinkage holes. The ejector drive component includes a push rod. The bottom end of the push rod is provided with a push rod that can be threaded to the sleeve. The bottom end of the push rod is provided with a drive rod. The diameter of the drive rod is smaller than the diameter of the push rod. A conical transition rod is provided between the drive rod and the push rod.

9. The welding fixture for welding vehicle frame grilles as described in claim 1, characterized in that, The tooling base is fixedly connected to the top of multiple support legs, the bottom of the support legs are used to cooperate with the ground foundation, and the support legs support the tooling base.

10. A method for using the welding fixture for welding a vehicle frame grille assembly as described in any one of claims 1-9, characterized in that, Includes the following steps: Select a template that matches the grating to be welded; Place the template on the upper surface of the tooling base; Multiple positioning angle rulers are placed on the tooling base. The fixing part of the positioning angle ruler is placed on the tooling base, and its positioning part is in contact with the side edge of the template. Each plate part of the template corresponding to the grid strip is provided with at least one positioning angle ruler. After the positioning angle ruler is placed, the fixing part is fixedly connected to the tooling base through the elongated hole of the fixing part, the fixing hole opened in the working base, and the fastener; Remove the template from the fixture base, and then place the multiple grid strips to be welded on the upper surface of the fixture base. The grid strips should fit against the positioning part of the corresponding positioning angle ruler, and the positioning angle ruler should be used for positioning. Multiple grid strips are welded together to form a grid welded component.

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