444 results about "Weld line" patented technology

The invention discloses an intelligent welding control system and method based on multiple sensors and electronic equipment, and belongs to the technical field of automatic welding, the system comprises a sensing layer, a decision-making layer and an execution layer, through cooperative work of a front laser vision sensor, a rear laser vision sensor and a molten pool image sensor, a groove three-dimensional model can be accurately established before welding, and the welding precision is improved. And dynamic information of the molten pool is continuously collected in the welding process, a dual monitoring mechanism for the geometric characteristics of the welding line and the state of the molten pool is formed, and multi-source data collection and fusion in the whole welding process are achieved. The control method comprises the steps of pre-scanning modeling, feedforward parameter planning, real-time feedback adjustment of a molten pool, data fusion optimization and the like, and high-precision self-adaptive control over welding parameters is achieved by combining deep learning and the Kalman filtering technology. According to the method, the welding adaptability, the control precision and the intelligent level can be remarkably improved, and the method is suitable for high-precision welding scenes such as pipelines, pressure containers and steel structures and has remarkable engineering application value and popularization prospects.

A friction stir additive manufacturing device configured to join a first work-piece and a second work-piece is provided. In one aspect, the device includes a rotating spindle configured to deposit a filler material over a weld line as the device is advanced along an interface between the first work-piece and the second work-piece. The device also includes a deposition head configured to receive at least a portion of the spindle, the deposition head configured to remain stationary relative to the rotating spindle. The deposition head includes a first semi-cylindrical portion having an inner radius and an outer radius relative to a first axis, and a second semi-cylindrical portion having an inner radius and an outer radius relative to a second axis that is perpendicular to the first axis. The second semi-cylindrical portion can include a chamfered inner surface configured to define a weld profile.

The invention relates to an X-ray weld defect intelligent detection method based on weld line perception and reversible domain mapping, which comprises the following steps: collecting a gray X-ray image of a weld region, and carrying out joint labeling on a weld center line track and a defect mask to construct a standardized training data set; designing a weld line sensing hybrid neural network architecture; performing end-to-end training on the network by using a joint loss function formed by detection task loss and center line consistency constraint to realize collaborative optimization of defect category discrimination and spatial positioning; and deploying the trained model in an automatic welding quality detection system, performing forward reasoning on X-ray images acquired in real time, and continuously outputting defect detection results with accurate category, position and form information in combination with a post-processing strategy of weld direction clustering. According to the invention, stable and accurate identification of slender and weak-texture weld defects under the condition of bent welds is realized, and automation and reliability of nondestructive detection of welds are remarkably improved.

The invention relates to the technical field of friction welding machines, and discloses a friction welding machine sliding table control method and device.The method comprises the following steps that movement data of a friction welding machine stirring head are collected in real time, and a stirring head kinetic model is established; based on the mobile data and the dynamic model, outputting a preliminary control strategy through an optimal linear quadratic regulation control algorithm; on the basis of the movement data, future movement data of the stirring head are predicted through a prediction control algorithm, and a preliminary control strategy is optimized; a control signal is sent to a servo motor of the sliding table to control the servo motor; and the difference between the real-time movement data of the stirring head and the prediction result is used as feedback data, and control strategy parameters are adjusted. According to the method, the difference between the real-time movement data of the stirring head and the prediction result is used as feedback, a closed-loop control mechanism is formed, and control parameters are continuously monitored and optimized. The position control precision of the stirring head is improved, the problem of response lag in high-speed welding is effectively solved, the consistency of welding line tracks is ensured, and position deviation is avoided.

The invention discloses butt welding equipment for electric vehicle hub production, which belongs to the technical field of welding and comprises a workbench, a forming cylinder, a guide column and a welding gun. A working face is arranged on the surface of the workbench and used for placing a plate as a basic blank for forming the hub outer frame. The forming cylinder is arranged above the workbench, and the arc surface of the forming cylinder serves as a forming surface, so that a plate is tightly attached and bent into an annular body. The two guide columns form pressure applying tracks on the two sides of the forming cylinder and move along the arc face, a plate is bent and attached to the surface of the forming cylinder, and the two ends of the plate are connected to form a welding line. And the end part of the welding gun can move along the welding line to finish welding. A plurality of adsorption openings communicated with the air suction channel are formed in the surface of the forming cylinder, adsorption force is applied to the plate, and movement or dislocation is prevented. A sealing ring is arranged on the periphery of the adsorption opening to improve sealing performance. A supporting plate and a ventilation hole are arranged in the adsorption opening, the structure of an air suction channel is optimized, the air suction efficiency is improved, and uniform distribution of adsorption force is ensured.

The invention discloses a weld ROI segmentation method based on active and passive vision fusion. The method comprises the following steps: synchronously acquiring a two-dimensional image and a three-dimensional point cloud of the surface of a welded workpiece; inputting the trained deep learning network, and outputting a weld joint candidate region and a pixel-level mask graph thereof; establishing a cross-modal mapping relation through geometric calibration, and projecting the three-dimensional point cloud to a two-dimensional image to complete registration and fusion; cutting from the three-dimensional point cloud by using a cross-modal mapping relation to obtain a candidate point cloud region; generating a gray matrix for ray odd-even discrimination according to the pixel-level mask pattern; and each point of the candidate point cloud is projected to a pixel coordinate point by point, ray odd-even discrimination is carried out on the projection points according to the gray matrix, the points conforming to an odd-even rule are determined as welding line points and are aggregated into a welding line ROI point cloud, and the welding line ROI point cloud is output as a segmentation result. According to the method, the adaptive capacity to the unstructured welding seam is effectively improved, the point cloud processing complexity is reduced, and good real-time performance and robustness are achieved.

The invention relates to an inner cavity curved surface welding line laser light path turning welding method which is used for solving the technical problem that an existing welding method is difficult to operate when curved surface welding is carried out in an inner cavity, and the method comprises the steps that a reflecting mirror is arranged on a light emitting path of a laser welding head, and original laser beams are deflected; the laser beam enters the inner cavity space and irradiates the to-be-welded area of the curved surface weld joint; surface cleaning and fixing are conducted on a to-be-welded area, and the folded laser beams are focused to the center of a welding seam; enabling the laser beam to perform scanning welding on the curved surface welding seam according to a preset scanning track; in the welding process, protective gas is jetted to the position, acting on the workpiece, of the laser beam so as to blow away welding spatter and provide gas protection for a welding seam. The propagation direction of laser beams is changed through the reflecting mirror, so that laser can enter the inner cavity to weld a curved surface weld joint, the application range of laser welding is expanded, and the problem that curved surface welding is difficult to operate in the inner cavity space through an existing welding method is solved.

The invention relates to the technical field of laser welding, and provides a high-speed laser welding wire box process based on multi-beam synergy, which comprises the following steps: step 1, at least three laser beams are adopted as a synergy composite heat source, a main laser beam is responsible for penetration fusion welding, and an auxiliary laser beam is responsible for preheating, post-heating or molten pool stabilization; when the copper-aluminum dissimilar material is welded, an auxiliary laser beam is switched into a green laser; and 2, assembling a multi-beam optical regulation and control unit comprising a diffractive optical element, a quartz field lens and a galvanometer scanning module, splitting a main beam into one main beam and two auxiliary beams through the diffractive optical element, controlling focal depth fluctuation by the quartz field lens, and realizing accurate movement positioning of a laser beam by the galvanometer scanning module. Through integration of multi-beam collaborative design and an intelligent control unit, remarkable breakthroughs are achieved in the aspects of welding efficiency, quality consistency and process adaptability, firstly, in the aspect of efficiency and process, the welding speed is greatly increased, multi-station synchronous operation of an automatic welding unit is matched, and the welding period of a single-line box is remarkably shortened.

The invention discloses welding equipment for machining a steam turbine valve, and relates to the field of valve welding equipment.The welding equipment comprises a mechanical arm and a welding cable, a welding gun barrel is installed on the mechanical arm, the welding cable is connected to the welding gun barrel, an extension pipe is installed on the welding gun barrel, and the extension pipe is connected to the welding cable; and a welding gun head is mounted at the end part of the extension pipe. It needs to be explained that in the embodiment of the invention, when the mechanical arm drives the welding gun head to make excessive contact with the valve, the welding gun retracts into the retraction sleeve; if the extension pipe deforms, the stopping and recycling sleeve is stopped from retracting, and the retracting pull plate pulls the extension pipe to retract into the welding gun pipe; and if the welding gun head is blocked by welding slag, the retraction pull plate also pulls the extension pipe to retract into the welding gun barrel, multi-mechanism triggering is achieved, protection is free of dead corners, all the devices are integrated on the welding gun head, the adaptability is high, the equipment transformation time is shortened, and the economic cost is reduced.

The invention provides a battery shell, a battery and a battery device, and relates to the technical field of batteries. The battery shell comprises a first side wall and a pressure relief piece arranged on the first side wall. The pressure relief piece and the first side wall are welded to form a welding line, and nicks are formed in the pressure relief piece to define a pressure relief part. The pressure relief part is opened to relieve pressure when the internal pressure of the battery reaches a pressure relief threshold value, and the product of the projected area of the nick on the first side wall and the distance from the bonding wire to the nick is limited in a specific range. By optimizing the position relation between the pressure relief piece and the bonding wire and combining area parameter matching of the nick and the pressure relief part, the pressure relief efficiency is guaranteed, meanwhile, the structural strength is improved, splashing of high-temperature substances and shell fragments is avoided, and the pressure relief structure has the advantages that the pressure relief structural strength is improved, the pressure relief pressure threshold value is accurately controlled, and damage to the peripheral area during pressure relief is prevented.

A die structure for reducing metal extrusion welding lines is divided into a male die and a female die, the male die is provided with shunting bridges and a die core, the female die is provided with a welding cavity, the front face of the welding cavity is in a petal shape, the shunting bridges and the welding cavity are evenly distributed in a radial shape, and after the shunting bridges and the welding cavity are oppositely combined, a complete shunting welding structure is formed. According to the utility model, the structure of the mold runner is optimized, the defects of welding lines of the produced metal extrusion product are greatly reduced, the grain size of the product is smaller, and the product performance is more excellent.

The invention discloses a visual virtual design system for an injection mold, and relates to the technical field of visual virtual design, and the system comprises a data acquisition module which is used for acquiring flowing position data and temperature distribution data in an injection filling process of simulating a melt flowing into a target injection mold, the flowing position data comprises leading edge position data when the melt flows along with time, and the temperature distribution data comprises temperature sequence data, recorded according to a preset time step length, of each grid unit corresponding to the target injection mold; the data processing module is used for determining a first pouring runner and a second pouring runner which form a weld line when the weld line is formed in the injection molding and filling process; determining a temperature difference integral value between the first pouring runner and the second pouring runner according to the temperature distribution data; determining a weld line forming reason according to the temperature difference integral value; and the virtual design module is used for designing the injection filling process of the target injection mold according to the forming reason. According to the invention, the time required for die design is reduced.

The invention provides an assembly line system for building a B-type cabin middle group sheet body. The assembly line system comprises a feeding unit, a laser cleaning and scribing unit, a friction stir welding plate splicing unit, a ray detection unit, an assembling and welding unit and a discharging unit which are connected in sequence. During construction, the bottom plate plates for splicing the bottom plate are hoisted to an assembly line one by one, the laser cleaning and scribing unit is used for cleaning and polishing a welding bead and scribing various mounting line indication lines, then the friction stir welding plate splicing unit is used for carrying out butt joint on the bottom plate plates one by one according to a plate splicing sequence, and the bottom plate of a middle group sheet body is synthesized; a butt welding seam of a bottom plate is subjected to flaw detection of the ray detection unit and then flows to the assembling and welding unit, T rows and rib plates are subjected to falling assembly according to the positions of an installation line and an indication line through the assembling and welding unit, fillet weld arc welding is carried out after assembly is completed, and finally discharging of a whole middle-group sheet body is carried out through the discharging unit.

The invention discloses a space discontinuous welding seam real-time tracking method and system based on laser vision, and relates to the technical field of robot intelligent welding, and the method comprises the steps that a laser stripe image of a to-be-welded area is collected in real time; performing denoising processing on the laser stripe image to obtain a denoised stripe image, extracting an image region of interest in the denoised stripe image, and extracting a stripe image center point in the image region of interest by adopting a gray centroid algorithm; performing segmentation fitting based on the central point of the stripe image to obtain a fitting straight line segment I and a fitting straight line segment II; and based on the calibration mapping relation, the image intersection points are mapped into a robot coordinate system through the image coordinate system, the pre-positioning image welding points are recognized as welding jump points, and the continuous welding line center fitted by the welding line feature image is recognized as continuous welding points. The method provided by the invention has the beneficial effects that the pre-positioning welding point and the continuous welding point are recognized in advance to guide the welding arm to carry out welding operation, the automatic operation of welding is facilitated, and the welding quality is improved.

The invention relates to a welding method. The welding line foundation quality is guaranteed from the source through optimization of a cleaning process in the early stage of welding. The size and identification of positioned welding are subjected to standardized design, the defects of positioned welding are reduced, standardized treatment is conducted for the environment temperature and humidity, the risk that cold cracks and air holes are generated when nine-nickel steel is welded in the severe environment is avoided, and therefore the subsequent welding quality is improved; a welding bead layering scheme is formulated according to the welding mode and the size of a welding leg, precise control over the fusion degree and the forming precision of a welding bead is achieved in combination with current and voltage parameter control over a welding material, and meanwhile a sectional welding mode is adopted in combination with arrangement of a transition groove and control over the secondary arcing overlapping length and the interlayer temperature; and it is guaranteed that interlayer fusion is good during multi-pass welding, the possibility that pits, pinholes and hot cracks appear in the welding process, and the slag detachability of a coating is poor is finally reduced, and the final quality of a product is guaranteed.

At least one of an outer ring and an inner ring of the insulating bearing is arranged to be an insulating ferrule, the insulating ferrule comprises a body, and the body further comprises a roller path, a bearing body and a bearing body, an axial end face; and a radial outer peripheral surface disposed opposite to the raceway in the radial direction. A material removal portion is included on a surface of the body, and an insulating layer is overmolded on the body and molded into the material removal portion. The invention further provides a manufacturing method of the insulating bearing. The manufacturing method comprises the step that a sprue of an injection molding machine for overmolding the insulating layer is arranged to enable a weld line of the overmolded insulating layer to avoid a main stress bearing area of the insulating ferrule and / or to be formed at the position, with the maximum thickness, of the insulating layer. The invention provides an insulating bearing and a manufacturing method thereof for solving the problem of electric corrosion of a bearing used in a high-pressure environment. Good electrical insulation of the bearing is achieved, the insulation layer can be further prevented from moving in the axial direction and / or the circumferential direction, the electrical performance of the insulation layer and the whole bearing is greatly improved, and the service life of the insulation layer and the whole bearing is greatly prolonged.

The application discloses a welding line body and a control method thereof, and relates to the technical field of welding. The welding line body comprises a base, a plurality of integrated wire feeding welding mechanisms, a plurality of bearing toolings, a conveying device and a control device. The bearing toolings are circulated between a plurality of work stations under the driving of the conveying device. By reasonably designing the structure of the bearing toolings, universal positioning of a plurality of products can be realized. A plurality of welding stations are arranged, a plurality of welding points are dispersed in the plurality of welding stations, and welding operations are respectively performed, which is beneficial to reducing the processing rhythm. Meanwhile, the integrated wire feeding welding mechanism is arranged, the wire feeding device and the welding device are integrated on the mechanical arm, the physical path of the welding wire from the wire coil to the welding point is greatly compressed, the length of the wire feeding path is greatly reduced, the space occupied by the whole integrated wire feeding welding mechanism is basically equal to the space required by the mechanical arm itself and the movement thereof, and the space is optimized.

The application discloses a kind of full-automatic welding equipment of automatic welding technical field, a kind of full-automatic welding equipment, including frame body, the frame body is fixedly connected with drive assembly, drive assembly is fixedly connected with transmission roller;Transmission roller is transmission connection between cable, the lower end of the frame body is fixedly connected with four supports for its support stability, the middle part of the frame body is provided with welding assembly, the side of transmission roller is provided with transmission assembly, transmission assembly includes four toothed rods, each toothed rod is engaged with tooth ring, the tooth ring is fixedly connected at the outside of transmission roller lower end;With the cooperation of transmission assembly and welding assembly, this process does not need multiple workers to cooperate welding, reduce the input of staff cost, at the same time also can not cause the misplacement of welding cable two ends, welding point is too large or does not meet the situation of welding requirement occurs.

A method for friction stir welding along a butt joint weld line (40). A welding device (70) includes a probe assembly (90) including at least a first and second probe device (100a, 100b). A first and second part (31a, 31b) to be joined along the weld line (40) are provided, wherein the parts are each formed as a laminate (1; 1′) including at least a first layer (2a, 2b) formed with a first material and a second layer (5a, 5b) formed with a second material. The first and second materials have different material properties. The method friction stir welds of the parts using the welding device, wherein simultaneously the first probe device acts on the first layers and the second probe device acts on the second layers.

The utility model discloses an automatic welding device for a floating ship plate of an oil storage tank, which relates to the technical field of floating ship plates of oil storage tanks and comprises a mounting rack, a guide rail fixedly mounted in the mounting rack, a slider slidably connected to the side wall of the guide rail, a welding gun fixedly mounted at the bottom of the slider, and adjusting mechanisms arranged on two sides of the mounting rack. The adjusting mechanism comprises a connecting rod, a movable frame, a threaded adjusting part, a fixed part and an electromagnet; according to the technical scheme provided by the utility model, the adjusting mechanism is adopted, the fixed part can be fixedly adsorbed on the surface of a stainless steel, iron or other magnetic floating ship plate by arranging the electromagnet, and then the movable frame can slide on the side wall of the connecting rod by rotating the threaded adjusting part; therefore, the distance between the two floating ship plates needing to be welded can be adjusted, a welding gun can be located at a welding line all the time in the welding process, deviation is avoided, the welding effect is better, and use is more convenient.

The application discloses a kind of wire processing welding methods and wire welding line, its wire processing welding method includes the following steps: wire separation: the pin of the length direction both ends of the wire to be welded is separated to specified angle;Bending: according to the product shape of FPC board, two bending points to be set in advance, the both ends of the length direction of wire are bent along two bending points to be;Welding: the wire is placed on FPC board, then several pins of wire are welded to FPC board.Several pins of wire are separated to specified angle, facilitate subsequent welding to the pin of wire;Further improve the processing and welding efficiency of wire.The pin of wire is welded after bending, and then the wire is laid on FPC board, without adjusting the position of wire, and further improve the processing and welding efficiency of wire.

The present invention relates to a wire rod for welding rods and a manufacturing method therefor. One aspect of the present invention is to provide a wire rod for welding rods and a manufacturing method therefor. A preferred aspect of the present invention is to provide: a wire rod for welding rods, having superior strength and wire drawability as well as excellent cost-effectiveness; and a manufacturing method therefor.

This invention discloses a method, system, and storage medium for interactive welding of the three-dimensional surface of a rudder workpiece, belonging to the field of automated welding technology. The welding method includes: acquiring complete raw point cloud data of the rudder workpiece through point cloud scanning; performing semantic segmentation on the three-dimensional surface structure in the raw point cloud data to obtain the rudder top surface point cloud; extracting the skeleton contour structure of the rudder workpiece based on the rudder top surface point cloud as welding guide lines; sorting the welding guide lines according to a pre-set arrangement; and adjusting the sorting of the welding guide lines interactively according to actual processing requirements to complete the interactive welding of the three-dimensional surface of the rudder workpiece. The welding system of this invention includes a structured light camera, a robotic arm, and an information processing computer. This invention automates the welding process of rudder workpieces, eliminating the problem of inconsistent results from manual welding, and also features interactive weld line selection functionality, adapting to different welding processes with high flexibility.

The application discloses an ETL-based welding line virtual process environment building method and device and a storage medium, belongs to the technical field of software development, and comprises the following steps: preparation: establishing a two-dimensional plane legend library and a PD three-dimensional model resource library with corresponding names; calling legends in the two-dimensional plane legend library to create a two-dimensional plane map; data extraction: filling in the work station information of the equipment in the two-dimensional plane map and generating an automatic layout table; data conversion: reading the work station information in the automatic layout table to automatically generate a resource tree Input table; data loading: generating a corresponding resource tree according to the information in the resource tree Input table, inserting an equipment node under the resource tree and modifying the spatial position of the equipment when the PD-ID in the automatic layout table is empty, and completing the virtual process environment building; the method optimizes the working method, improves the working efficiency and accuracy, and can realize the traceability of data changes.

The application relates to a solar silicon wafer broken line step color difference improvement method, which comprises the following steps: S1. old line welding treatment is adopted; S2. according to the current wire supply amount, wire return amount, cutting direction and periodic position when the broken line occurs, the remaining periodic wire amount is calculated; S3. after the welded wire head is walked, then the corresponding parameters of the equipment are adjusted according to the calculated remaining periodic wire amount, and then the silicon wafer cutting of the remaining periodic wire amount is continuously completed and the cutting of the next stage is entered. The method adopts the old line to perform the broken line welding treatment, and combines the calculation of the remaining periodic wire amount and the corresponding parameter adjustment, so that the step line marks on the surface of the silicon wafer produced after the broken line replacement are faded, the color difference problem of the silicon wafer is improved, and the production yield of the silicon wafer is improved.

The application discloses a circuit board welding jig and relates to the technical field of circuit board welding jigs. The application provides a circuit board welding jig, which comprises a base, a bearing part, a pressing assembly and a jacking assembly. The bearing part has a plurality of placement grooves arranged in a circumferential direction, and the placement grooves are used for placing circuit boards to be welded. The pressing assembly is arranged above the bearing part and has a tendency to move towards the bearing part. The jacking assembly is rotatably arranged on the base and can drive the bearing part to rotate in the circumferential direction, so that a target placement groove on the bearing part moves below the pressing assembly. During the movement of the target placement groove below the pressing assembly, the jacking assembly applies a driving force to the pressing assembly in a direction away from the bearing part. The jacking assembly can rotate relative to the bearing part to cancel the driving force, so that the pressing assembly can press the circuit board to be welded.

The invention discloses an extra-thick high-strength and high-toughness steel plate for high heat input welding and a production method thereof, and belongs to the technical field of medium-thickness plates. The steel plate comprises the following chemical components in percentage by mass: 0.05 to 0.08 percent of C, 0.1 to 0.2 percent of Si, 1.5 to 1.6 percent of Mn, 1.2 to 1.5 percent of Ni, 0.08 to 0.15 percent of Mo, 0.015 to 0.025 percent of Nb, 0.03 to 0.05 percent of V, 0.008 to 0.015 percent of Ti, 0.0002 to 0.0007 percent of Mg, 0.0005 to 0.002 percent of Ca, less than or equal to 0.008 percent of P, less than or equal to 0.003 percent of S and the balance of iron and inevitable impurities. The production method comprises the procedures of LF refining, VD vacuum treatment, die casting, heating, rolling and heat treatment. When the maximum thickness of the steel plate is 150mm and the welding line energy is 200KJ / cm, the impact energy of a heat affected zone at 60 DEG C below zero is greater than or equal to 42J.

The invention discloses an injection molding part for welding a display panel and a manufacturing method of the injection molding part, a plurality of discontinuous welding prisms are arranged on the upper surface of the injection molding part in the length direction of the injection molding part, and the prisms meet the following conditions that the height is smaller than 0.8 mm; the distance between every two adjacent prisms is smaller than 0.5 mm. The length of a welding line formed by a single prism is smaller than 12 mm, and the width is smaller than 1 mm. The injection molding part and the plastic plate or the acrylic plate are tightly combined together through the ultrasonic welding technology to form the novel display panel, the technological process is simplified, the firmness degree of the panel is improved, the manufacturing cost of the appearances of mechanical equipment and household appliances is reduced, and the production efficiency is improved.

The invention relates to a semiconductor metal target automatic welding line which comprises a truss mechanical arm, a feeding platform, a heating platform, a welding platform, a pressure maintaining platform, a dislocation mechanism platform and a material carrying platform. The robot is used for coating welding flux on a target material and a back plate, cleaning the welding surfaces of the target material and the back plate and assembling the target material and the back plate, and a truss manipulator is arranged to replace a worker, so that the target material, the back plate and a target material and back plate assembly are automatically transferred among the platforms; the robot is arranged to realize automatic cleaning and welding of the target material and the back plate; the heating platform is arranged to accurately control the temperature of the target material and the back plate; the pressure maintaining platform is arranged to accurately control the magnitude and time of pressure applied to the target material back plate assembly; by means of the structure, automatic welding of the target material and the back plate can be achieved, meanwhile, various parameters in the welding process are accurately controlled, manual operation is reduced, and the stability of product quality is improved.

To provide an injection molded body capable of improving the strength of a junction by suppressing the generation of a weld line at the junction of two resin flows.SOLUTION: In a case 11 which is an injection molded body, a groove part 8 for increasing a flow rate of a resin flow A is formed on both sides of a merging part 7 formed by merging two resin flows A in different directions during injection molding.SELECTED DRAWING: Figure 2