CNC laser production and processing system for neodymium iron boron shielding case

Abstract

The utility model relates to the technical field of magnet shielding, and particularly discloses a CNC (Computer Numerical Control) laser production and processing system for a neodymium iron boron shielding case, which comprises a CNC milling module and a laser cutting module, the CNC milling module comprises a first workbench, a first milling cutter, a first driving device and a CNC control unit, the first workbench is used for bearing an external workpiece to be machined, and the CNC control unit is used for controlling the first driving device to drive the first milling cutter to conduct groove milling on the workpiece to be machined on the first workbench so as to form a containing blind groove in the workpiece to be machined; the laser cutting module comprises a second workbench, a laser generator and a laser control unit, the second workbench is used for bearing the to-be-machined part processed by the CNC milling module, and the laser control unit is used for generating a preset cutting path according to the shape and size of the needed shielding case; and controlling a laser generator to generate a laser beam according to the cutting path to fuse the workpiece to be processed along the edge of the accommodating blind groove so as to form the shielding case with the accommodating blind groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnet shielding technical field especially disclose a kind of neodymium iron boron shield's CNC laser production and processing system. BACKGROUND

[0002] Neodymium iron boron material is usually used to manufacture magnetic shield due to its excellent magnetism and wide application. However, the hardness of neodymium iron boron material is high and the brittleness is large, which makes its processing difficulty higher. Traditional mechanical processing is easy to cause material damage and low processing precision, and it is difficult to meet the demand of complex shape. Especially in the manufacturing process of shield, high-precision accommodating blind slot and cutting process are needed to ensure the shielding effect and structural integrity. In the prior art, high-precision and high-efficiency processing can be realized by combining CNC milling and laser cutting. However, how to further optimize the process flow of raw material treatment, automatic feeding, polishing and electroplating has become an important issue to improve product quality and production efficiency. SUMMARY

[0003] In order to overcome the shortcomings and deficiencies existing in the prior art, the purpose of the utility model is to provide a kind of neodymium iron boron shield's CNC laser production and processing system.

[0004] To achieve the above-mentioned purpose, the utility model of a kind of neodymium iron boron shield's CNC laser production and processing system, including CNC milling module and laser cutting module;CNC milling module includes first workbench, first milling cutter, first driving device and CNC control unit, first workbench is used to bear external workpiece to be processed, CNC control unit is used to control first driving device to drive first milling cutter to mill groove on the workpiece to be processed on first workbench, to form accommodating blind slot on the workpiece to be processed;Laser cutting module includes second workbench, laser generator and laser control unit, second workbench is used to bear the workpiece to be processed after CNC milling module processing, laser control unit is used to generate cutting path around accommodating blind slot according to the shape and size of required shield, and laser generator is controlled according to cutting path to move around accommodating blind slot and cut off workpiece to be processed to form shield with accommodating blind slot.

[0005] Further, the production and processing system further includes raw material slitting module, and the raw material slitting module includes unwinding device, tensioning device, first cutting device, second cutting device and workpiece collecting device;Unwinding device is used to unwind external coiled material to tensioning device to flatten and tension, first cutting device is used to cut the flattened and tensioned coiled material into strip-shaped sheet material, second cutting device is used to cut the strip-shaped sheet material into workpiece to be processed, and workpiece collecting device is used to store workpiece to be processed.

[0006] Further, an automatic feeding device is arranged between the workpiece collecting device and the second workbench, the workpieces in the workpiece collecting device are used to supply the automatic feeding device, and the automatic feeding device is used to deliver the workpieces to the second workbench.

[0007] Further, the production processing system further comprises a polishing module, the polishing module comprises a grinding machine and a surface cleaning device, the shielding cover formed by the laser cutting module is subjected to external surface grinding treatment and blind groove inner side grinding treatment by the grinding machine to remove impurities and burrs of the shielding cover, and the shielding cover after the grinding treatment is cleaned of residual impurities by the cleaning device.

[0008] Further, the abrasive arranged in the grinding machine is a plurality of combinations of alumina, silicon carbide, diamond powder, chromium oxide and cerium oxide; silicon carbide abrasive is used for initial rough polishing of the grinding machine, alumina abrasive is used for medium-term fine polishing, and diamond powder and cerium oxide abrasive are combined for later fine polishing.

[0009] Further, the production processing system further comprises an electroplating module for plating treatment of the surface of the shielding cover after the polishing module, the electroplating module comprises an electroplating tank, a flushing machine and a drying machine, the electroplating tank is provided with electrolyte, a cathode clamp and an anode clamp, the cathode clamp is used to fix the shielding cover and connect the negative pole of the external power supply, and the anode clamp is used to fix the anode material and connect the positive pole of the external power supply; the shielding cover after the plating treatment is subjected to surface residual electrolyte flushing by the flushing machine, and the shielding cover after the flushing is subjected to drying treatment by the drying machine.

[0010] Further, a first detection unit is arranged between the polishing module and the electroplating module, the first detection unit is used to detect the data of the outer shape size of the shielding cover after polishing, and compare the data with the preset outer shape size data of the shielding cover, the shielding cover meeting the preset outer shape size enters the electroplating module for treatment.

[0011] Further, a second detection unit is arranged after the electroplating module, the second detection unit is used to detect the uniformity, adhesion and thickness of the plating layer of the shielding cover after the treatment of the electroplating module, and the shielding cover with detection results meeting the preset data enters the next process.

[0012] Further, the anode material is one or a combination of nickel, copper, zinc and aluminum or a ceramic coating.

[0013] Further, the laser control unit is connected with a host computer, the host computer controls the laser generator to perform laser cutting on the workpiece with the blind groove via the laser control unit, and one side of the laser generator is provided with a scanning device connected with the laser cutting system.

[0014] The scanning device is used to write the profile size of the workpiece to be processed and the accommodating blind slot into the master drawing generated by the host computer via the laser control unit, the host computer draws the processing profile based on the master drawing to generate a cutting preview drawing, the laser control unit generates a cutting code according to the cutting preview drawing and controls the laser generator to generate a laser beam to melt and cut the workpiece to be processed around the accommodating blind slot to obtain the shield cover.

[0015] The CNC laser production and processing system combines the CNC milling pin technology and the laser cutting technology. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The production process schematic diagram of the utility model is shown in the figure.

[0017] Figure 2 The production and processing system schematic diagram of the utility model is shown in the figure.

[0018] Figure 3 The structure schematic diagram of the workpiece to be processed of the utility model is shown in the figure.

[0019] Figure 4 The structure schematic diagram of the workpiece to be processed after milling slot of the utility model is shown in the figure.

[0020] Figure 5 The finished product structure schematic diagram of the shield cover of the utility model is shown in the figure.

[0021] The reference signs include:

[0022] 100, workpiece to be processed; 101, accommodating blind slot; 200, shield cover. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in combination with the embodiments and the drawings, and the content mentioned in the embodiments is not a limitation of the utility model.

[0024] Please refer to Figures 1 to 5As shown, the CNC laser production and processing system of the neodymium iron boron shield cover adopts the combination of CNC milling and laser cutting, and can realize precision manufacturing. The working process is as follows: first, the raw material is cut into a sheet suitable for processing by the slitting module. Then, the workpiece 100 is conveyed to the first workbench of the CNC milling module by the automatic feeding device. In this stage, the CNC control unit drives the first milling cutter to accurately mill the workpiece through the first driving device according to the preset program, and processes the accommodating blind groove 101. Next, the workpiece is transferred from the first workbench to the second workbench of the laser cutting module, and the laser generator in the laser cutting module performs high-precision fuse cutting around the edge area of the accommodating blind groove 101 according to the cutting path through the laser control unit, forming the external contour of the shield cover 200. After cutting, if surface treatment is required, the shield cover 200 will be automatically conveyed to the subsequent polishing and electroplating module for surface fine grinding and plating treatment, and finally the product size, plating adhesion and other indicators are detected by the quality detection unit to ensure product qualification. In the whole system, the equipment is closely cooperated through the automatic conveying and control system, ensuring the continuity and efficiency of the processing flow.

[0025] The system can ensure the machining precision of the neodymium iron boron shield cover through high-precision milling of the CNC milling module and non-contact fine processing of the laser cutting module, and is especially suitable for such brittle and high-hardness materials. Laser cutting avoids damage to the material caused by traditional mechanical processing, while ensuring efficient manufacturing of complex shapes

[0026] Specifically, the production and processing system further comprises a raw material slitting module, which is mainly responsible for processing the roll material into the workpiece 100 suitable for CNC milling and laser cutting. The specific working process is as follows: first, the raw material roll is unwound by the unwinding device, and the roll material is flattened and tensioned by the tensioning device to ensure the stability and precision in the subsequent cutting process. Then, the roll material is longitudinally cut into a strip-shaped sheet by the first cutting device. Then, the strip-shaped sheet is transmitted to the second cutting device, which is transversely cut to form a workpiece 100 with appropriate size. After cutting, the workpiece 100 is automatically collected and temporarily stored by the workpiece collecting device, ready for further processing in the subsequent CNC milling and laser cutting module.

[0027] Specifically, an automatic feeding device is provided between the workpiece collection device and the second workbench. This module is designed to automate the transfer of workpieces from the slitting module to the CNC milling and laser cutting modules. The workflow is as follows: after the raw material is processed by the first and second cutting devices of the slitting module, the workpieces 100 are sent to the workpiece collection device, which temporarily stores these workpieces 100. Next, the automatic feeding device takes the workpieces 100 from the workpiece collection device and transfers them to the second workbench of the CNC milling module through the conveying mechanism, preparing for milling and laser cutting.

[0028] The core components of the automatic feeding device include a feeding mechanism and a positioning system. The feeding mechanism ensures the stable delivery of workpieces 100, while the positioning system precisely fixes the workpieces on the second workbench, ensuring their position and angle align with the CNC and laser cutting paths. The various modules work together through an automated control system to ensure smooth and efficient flow between different stages, thereby improving the automation level and production efficiency of the production line.

[0029] By introducing the automatic feeding device, the workpieces achieve seamless automated transfer between the workpiece collection device and the second workbench. This design reduces the need for manual intervention and avoids delays in transferring workpieces between different modules, thereby improving the continuity and overall production efficiency of the production line. This continuous automated feeding process is particularly suitable for mass production, effectively shortening the production cycle and ensuring high production efficiency.

[0030] Specifically, the polishing module is used to process the surface of the shielding cover 200 after it is processed by the laser cutting module. The workflow is as follows: after the laser cutting module completes the cutting, the shielding cover 200 is automatically transferred to the polisher of the polishing module for surface treatment. The polisher uses a grinding head or a grinding disc to mechanically polish the surface of the shielding cover 200 to remove burrs, rough edges, and other impurities generated during the cutting process. To ensure the uniformity and precision of polishing, the grinding head of the polisher is adjusted according to the shape and surface complexity of the workpiece, providing precise surface treatment. After polishing, the shielding cover 200 enters the surface cleaning device, which uses high-pressure airflow or ultrasonic cleaning technology to further remove dust, debris, or other impurities left over from the polishing process, ensuring that the surface of the shielding cover 200 is clean and smooth. The entire polishing process is automated, and the devices are connected through an automatic conveying system to ensure the continuity and efficiency of the production process.

[0031] Through the polishing and cleaning process in the polishing module, the surface finish of the shielding cover 200 is significantly improved, removing burrs and rough edges generated during the machining process, ensuring the fine appearance and surface quality of the product.

[0032] Specifically, the abrasive materials set in the polishing machine are a combination of multiple types of materials, including aluminum oxide, silicon carbide, diamond powder, chromium oxide, and cerium oxide.

[0033] In this embodiment, the polishing machine uses a combination of multiple abrasive materials and adopts a phased polishing process to gradually improve the surface quality of the shielding cover 200. The specific workflow is as follows: In the early stage of polishing, the polishing machine uses silicon carbide abrasive for rough polishing. Silicon carbide abrasive is hard and can effectively remove large burrs and rough areas on the surface of the shielding cover 200. The main goal of this stage is to quickly remove surface defects generated during the cutting process. Next, the polishing machine switches to aluminum oxide abrasive for intermediate fine polishing. Aluminum oxide abrasive is small and durable, suitable for further fine processing to improve surface smoothness and reduce rough lines left by previous polishing. In the final stage of polishing, the polishing machine uses a combination of diamond powder and cerium oxide abrasive for later fine polishing. Diamond powder is extremely hard and can ensure high precision in surface treatment, while cerium oxide can further improve the smoothness and remove microscopic surface defects to ensure that the shielding cover 200 achieves a mirror effect.

[0034] The polishing machine automatically switches abrasive materials according to the surface condition of the workpiece in each stage of polishing, and adjusts the pressure and speed of the polishing head to adapt to the polishing requirements of different stages, ensuring efficient and accurate polishing. After polishing, the shielding cover 200 enters the cleaning device to remove polishing residues and complete the polishing process.

[0035] Specifically, the electroplating module is used to perform plating treatment on the surface of the polished shielding cover 200. The specific workflow is as follows: First, the shielding cover 200 is conveyed into the electroplating tank, which contains electrolyte, cathode clamps, and anode clamps. The shielding cover 200 is fixed by the cathode clamp and connected to the negative electrode of the external power supply, while the anode material is connected to the positive electrode through the anode clamp. The electrolyte contains metal ions. When the external power supply is turned on, the current passes through the electrolyte, and under the action of the electric field, the metal ions in the anode material migrate to the surface of the shielding cover 200 through the electrolyte and form a uniform plating layer.

[0036] After electroplating is completed, the shielding cover 200 passes through the rinsing machine to rinse off the residual electrolyte and other chemical residues on the surface with deionized water or cleaning agents to ensure surface cleanliness. Subsequently, the shielding cover 200 is sent into the drying machine to completely evaporate the surface moisture through hot air or infrared drying, etc., to ensure the dryness and stability of the plating layer. The various devices in the electroplating module work in coordination through the automatic transmission system to ensure the continuity and efficiency of the electroplating, rinsing, and drying processes.

[0037] Specifically, the anode material is one or a combination of nickel, copper, zinc, aluminum or a ceramic coating. In actual implementation, first, the shielding cover 200 enters the electroplating tank through the automatic conveying system, and the electroplating tank is filled with a suitable electrolyte. Depending on the selected anode material, the electrolyte will contain corresponding metal ions (such as nickel ions, copper ions, etc.). The anode material is connected to the positive electrode of the power supply through the anode clamp, and the shielding cover 200 is connected to the negative electrode through the cathode clamp. After the power supply is powered on, the metal atoms in the anode are released into ions in the electrolyte and migrate to the surface of the shielding cover 200 under the action of the electric field to form a uniform plating layer.

[0038] For example, if the anode material used is nickel, a nickel plating layer will be formed, and if a combination of nickel and copper is used as the anode, a multi-layer metal plating layer or an alloy plating layer can be formed. When a ceramic coating is selected as the anode, a specially formulated electrolyte is used in the electroplating tank to deposit ceramic material on the surface of the shielding cover 200 through an electrochemical reaction, providing additional corrosion resistance and insulation protection. After electroplating is completed, the shielding cover 200 is cleaned of electrolyte residue by a rinsing machine and dried by a drying machine to ensure the adhesion and stability of the plating layer. The entire electroplating process is coordinated by an automated system, with seamless connection between each step to ensure the efficiency and accuracy of the electroplating process.

[0039] Specifically, a first detection unit is provided between the polishing module and the electroplating module to ensure that the polished shielding cover 200 meets the required outer dimensions. The specific working process is as follows: after the shielding cover 200 is processed by the polishing module, the conveying system sends it to the first detection unit. This module uses high-precision measuring equipment (such as a laser range finder, a three-dimensional scanner, or an optical sensor) to comprehensively detect the outer dimensions of the shielding cover 200. The detection unit captures the length, width, height, and curved surface geometry of the shielding cover 200 and compares these measured data with the preset standard shielding cover 200 outer dimensions. If the dimensions are within the allowable tolerance range, the shielding cover 200 that meets the standard is automatically conveyed to the electroplating module for further processing; if the dimensions deviate from the preset standard, the system will automatically reject the unqualified workpiece or return it to the polishing module for reprocessing.

[0040] Specifically, the second detection unit is provided after the electroplating module and is mainly used for detecting the plating layer of the electroplated shielding cover 200.

[0041] The specific process is as follows: after the shielding cover 200 is processed by the electroplating module, the automatic conveying system sends it into the second detection unit. This module integrates various detection equipment to ensure that the quality of the plating layer meets the preset requirements. First, the thickness detection device (such as an eddy current thickness gauge or an X-ray fluorescence analyzer) accurately measures the thickness of the plating layer of the shielding cover 200 to ensure that the plating layer thickness of each workpiece is uniform and meets the requirements. Then, the adhesion test equipment (such as a tensile tester or a cutting test device) detects the bonding strength of the plating layer and the base material through non-destructive or small-scale destructive experiments to ensure that the plating layer does not peel off during subsequent use. Finally, the surface uniformity detection device (such as a visual detection system or a laser scanner) analyzes the smoothness, glossiness, and uniformity of the plating layer surface to detect whether there are problems such as uneven plating layer, bubbles, or roughness.

[0042] All detection data is compared with the preset standard in real time, and only the shielding cover 200 that meets the preset standard can continue to the next process, such as further assembly or packaging. The unqualified shielding cover 200 is automatically rejected or reprocessed to ensure product quality.

[0043] Specifically, in the processing of neodymium iron boron shielding covers, the scheme is based on laser cutting technology and realizes accurate cutting through the cooperative work of the host computer, the laser control unit, and the scanning device. The specific working process is as follows: first, the workpiece 100 (i.e., the shielding cover 200 blank) is placed in the accommodating blind slot 101 of the processing platform, and the scanning device in the laser cutting system starts to work, using laser ranging technology or 3D laser scanning to comprehensively measure the profile of the workpiece 100 and the accommodating blind slot 101 in which it is located. The scanning device transmits the collected profile size information to the laser control unit, which then writes it into the host computer to generate a master graph of the workpiece and the accommodating blind slot 101.

[0044] Based on the generated master graph, the host computer will draw the processing contour and generate a cutting preview graph, which accurately displays the cutting area and path. Subsequently, the laser control unit generates the corresponding cutting code (G code, etc.) according to the data in the preview graph, which controls the laser generator through the code instructions. After the laser generator is started, the high-energy laser beam generated by it circles the accommodating blind slot 101 along the predetermined path, melts and breaks the workpiece 100 layer by layer, and finally completes the precise cutting of the shielding cover 200. During the entire process, the energy of the laser beam, the focal point position, and the cutting path are all adjusted in real time by the laser control unit to ensure high precision in processing. The working process of the system of the utility model is as follows: first, the raw material slitting module flattens the coiled material through the unwinding device and tensioning device, the first cutting device cuts it into strip-shaped sheets, and the second cutting device cuts the strip-shaped sheets into workpieces 100 of suitable processing size. The workpieces 100 are then conveyed to the CNC milling module by the automatic feeding device.

[0045] Secondly, in the CNC milling module, the workpiece 100 is fixed on the first workbench, the CNC control unit controls the first driving device to drive the first milling cutter to mill on the workpiece 100 to form the precise accommodating blind slot 101 required by the shield 200. The CNC control unit can preset the machining path according to the specific design of the shield 200 to ensure the machining accuracy.

[0046] After the accommodating blind slot 101 is formed, the workpiece 100 is conveyed to the second workbench. The laser generator of the laser cutting module cuts along the edge of the accommodating blind slot 101 according to the preset cutting path through the laser control unit. The high-energy laser beam generated by the laser generator melts the material along the edge of the accommodating blind slot 101, and finally forms the shape of the shield 200 meeting the design requirements.

[0047] For high-quality Nd-Fe-B shields, the shield 200 will enter the polishing module after forming, and the surface is polished to remove burrs and impurities through the grinding machine, and is treated through the surface cleaning device. Then it can enter the electroplating module to realize plating treatment through the electroplating tank to improve the corrosion resistance of the shield 200.

[0048] The detection unit in the system is responsible for detecting the size accuracy after polishing, and the uniformity, thickness and adhesion of the plating layer after electroplating to ensure that the quality of the shield 200 meets the design standard.

[0049] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range will be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A CNC laser manufacturing system for a neodymium iron boron shield, characterized in that: The system includes a CNC milling module and a laser cutting module. The CNC milling module includes a first worktable, a first milling cutter, a first drive device, and a CNC control unit. The first worktable is used to carry an external workpiece to be processed. The CNC control unit is used to control the first drive device to drive the first milling cutter to mill grooves on the workpiece to be processed on the first worktable, so as to form a blind groove on the workpiece. The laser cutting module includes a second worktable, a laser generator, and a laser control unit. The second worktable is used to carry the workpiece to be processed after being processed by the CNC milling module. The laser control unit is used to generate a cutting path around the blind groove according to the shape and size of the required shielding cover, and to control the laser generator to generate a laser beam to move around the blind groove and cut the workpiece according to the cutting path, so as to form a shielding cover with a blind groove.

2. The CNC laser manufacturing system for the neodymium iron boron shielding cover according to claim 1, characterized in that: The production and processing system also includes a raw material slitting module, which includes an unwinding device, a tensioning device, a first cutting device, a second cutting device, and a workpiece collecting device. The unwinding device is used to unwind external rolls of material to the tensioning device for flattening and tightening. The first cutting device is used to cut the flattened and tightened rolls into strips. The second cutting device is used to cut the strips into the workpieces to be processed. The workpiece collecting device is used to store the workpieces to be processed.

3. The CNC laser manufacturing system for the neodymium iron boron shielding cover according to claim 2, characterized in that: An automatic feeding device is provided between the workpiece collecting device and the first worktable. The workpiece to be processed in the workpiece collecting device is used to supply the automatic feeding device, and the automatic feeding device is used to transport the workpiece to be processed to the second worktable.

4. The CNC laser manufacturing system for the neodymium iron boron shielding cover according to claim 1, characterized in that: The production and processing system also includes a polishing module, which includes a grinding machine and a surface cleaning device. The shielding cover formed by the laser cutting module is polished on the outer surface and the inner side of the blind groove by the grinding machine to remove impurities and burrs from the shielding cover. The shielding cover after polishing is cleaned by the cleaning device to remove residual impurities.

5. The CNC laser manufacturing system for the neodymium iron boron shielding cover according to claim 4, characterized in that: The abrasive inside the grinding machine is one or more of the following: alumina, silicon carbide, diamond powder, chromium oxide, and cerium oxide.

6. The CNC laser manufacturing system for the neodymium iron boron shielding cover according to claim 4, characterized in that: The production and processing system also includes a first detection unit, which is used to detect the shape and size data of the shield after the polishing module, and compare the data with the preset shape and size data of the shield. Shields that meet the preset shape and size data enter the next process.

7. The CNC laser manufacturing system for the neodymium iron boron shielding cover according to claim 1, characterized in that: The production and processing system also includes an electroplating module, which includes an electroplating tank, a rinsing machine, and a drying machine. The electroplating tank is equipped with an electrolyte, a cathode clamp, and an anode clamp. The cathode clamp is used to fix the shielding cover and connect it to the negative terminal of an external power source, and the anode clamp is used to fix the anode material and connect it to the positive terminal of an external power source. The shielding cover, after being treated with the plating, is rinsed by the rinsing machine to remove residual electrolyte from its surface, and then dried by the drying machine.

8. The CNC laser manufacturing system for the neodymium iron boron shielding cover according to claim 7, characterized in that: The electroplating module is equipped with a second detection unit at its end. The second detection unit is used to detect the uniformity, adhesion and thickness of the coating of the shielding cover after the electroplating module has been processed. The shielding cover that passes the test will proceed to the next process.

9. The CNC laser manufacturing system for the neodymium iron boron shielding cover according to claim 7, characterized in that: The anode material is one or more of nickel, copper, zinc, and aluminum, or a ceramic coating.

10. The CNC laser manufacturing system for the neodymium iron boron shielding cover according to claim 1, characterized in that: The laser control unit is connected to a main control computer, which controls the laser generator to perform laser cutting on the workpiece with a blind groove via the laser control unit. A scanning device connected to the laser cutting system is provided on one side of the laser generator. The scanning device is used to write the outline dimensions of the workpiece and the accommodating blind groove into the main control computer via the laser control unit to generate a master image. The main control computer draws the processing outline based on the master image to generate a cutting preview image. The laser control unit generates a cutting code based on the cutting preview image and controls the laser generator to generate a laser beam to circumferentially cut and melt the workpiece around the edge of the accommodating blind groove to obtain a shield with the accommodating blind groove.

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