CNC machining center speaker processing uses the Smart5-axis wood CNC machining center of PaolinoBacci, Italy. The center has X, Y, Z axes, and B and C axes that rotate around the X and Y axes. It has five axes of independent or interlocking cutting capability, which can quickly and accurately perform complex surfaces such as contours, grooves, and engraving. Cutting processing. The center uses the OSAI CNC system and also supports the anti-certification software Pitagora.
Test Method Computer Aided Design Using the Rhino3D software, the 3D model of the speaker is drawn according to the design requirements as shown. The shape is an ellipsoidal horn having a length of 430 mm, a maximum width of 290 mm, and a wall thickness of 15 mm. According to its structural characteristics, it is divided into two parts in symmetry in the actual processing. The model is as shown, and then the two parts of the symmetry are bonded together by a wooden raft.
Computer-aided manufacturing 1 tool selection, machining method and tool path: the choice of tool is related to the shape and structure of the workpiece and the processing method. The suitability of the tool directly affects the processing quality and processing efficiency. Generally used for flat milling cutters for surface machining and ball milling cutters for surface machining. Four tools are used for machining, and their types and parameters are as shown.
According to the shape and size of the blank to be processed and the surface to be machined and its constraint surface, different processing methods are selected, and the machining parameters are set to generate the tool path and the machining program. The processing sequence is: the outer surface of the speaker → the inner surface of the speaker. The outer surface processing method is: blank processing (20mm flat milling cutter) → surface machining (24mm ball milling cutter); inner surface processing method is: blank processing (20mm flat milling cutter) → surface machining (24mm and 10mm ball milling cutter) ) → Blinking processing (8mm drilling knife).
After the tool path is generated, the analog machining function provided by AlphaCAMV5 is applied to verify whether the product meets the design requirements. Otherwise, the parameter settings of the machining tool and machining mode need to be re-adjusted. After the simulated test piece meets the design requirements, the general NC code is output.
2 anti-certification software Pitagora simulation processing: the anti-certification software Pitagora includes NC language post processing, tool and cutting process parameters and processing origin settings. NC language post processing is to convert the general NC language compiled by AlphaCAMV5 into a test route for Smart5-axis processing. Wooden speaker 3D model processing finished model Wooden speaker processing tool cutter 20mm flat milling cutter 24mm ball milling cutter 10mm ball milling cutter 8mm Drilling knife processing object The surface of the outer surface of the processing of the blank and the inner part of the curved surface of the speaker. The curved surface of the speaker is large according to the processing of the blank, and the processing precision is not high. Large tool diameter, fast processing speed, high processing efficiency According to the curvature radius, machining accuracy, machining efficiency and other factors of the curved surface, the NC code of the heart system is determined by considering the wall thickness of the speaker and the size of the boring head. Tool parameter settings include tool number, tool radius, tool length, and mounting position. The spindle speed set according to different tools is 10000~14000r/min. The maximum feedrate is set to 6000mm/min. In actual machining, the feedrate can be manually steplessly adjusted within the maximum feedrate range. The origin of the CNC machining center machine is often different from the actual machining origin position. Therefore, the machining origin is set by measuring the offset of the machining origin according to the actual machining position of the test piece and the origin position established when the model is constructed.
After completing the parameters such as tool, spindle speed, feed rate, etc., the general NC code compiled by AlphaCAMV5 is imported into the reverse software according to the processing order, and then the simulation processing is performed to check whether the machine is overtraveled, the test piece, the tool, and the work. Whether there is a dry collision between the stations, etc., until all the processed parts pass the safety verification. At this point, complete the NC program debugging.
The actual machining is based on the processing sequence set by the program, and the outer surface of the speaker is first processed. The blank of the test piece to be processed is fixed on the mold by a vacuum negative pressure device, and the blank is processed by a 20 mm flat milling cutter. After the blank processing is completed, the test piece is as shown.
Then the machining center automatically replaces the 24mm ball milling cutter to process the outer surface of the speaker. The finished test piece is shown. After the outer surface of the speaker is processed, the mold is replaced, and the test piece for the outer surface processing is also fixed on the mold by a vacuum negative pressure device, and the inner blank of the speaker is processed by a 20 mm flat milling cutter.
After the blank processing is finished, according to the different radius of curvature of the inner surface of the speaker, according to the setting procedure, the machining center automatically replaces the 24mm and 10mm ball milling cutters to process the inner curved surface, and finally automatically replaces the 8mm drilling knife and performs the 在 on the speaker wall. Eye processing. After the inner and outer surfaces of the speaker are finished, the test piece is as shown. After being glued into a whole by wood rafts, the appearance of the wooden speaker is as shown.
Results and Discussion In the actual processing, the blank material is generally a regular rectangular parallelepiped, and the product is a complex curved surface. Therefore, before the surface is processed, the excess material is cut and removed, that is, the blank processing is performed. In the processing of the wooden speaker, if the inner and outer surfaces are directly processed by a ball milling cutter, two problems will be encountered: one is that the ball milling cutter has doubled the cutting amount, is extremely easy to wear, the processing quality is reduced, and the production cost is increased; Due to the large size of the product, especially in the height direction, the length of the ordinary ball milling cutter cannot meet the one-time forming, and it is necessary to repeat the processing many times, which reduces the production efficiency. If the blank is processed, the large-diameter flat milling cutter is generally used, the cutting speed is faster than the ball milling cutter, and the cutting amount is much larger than the ball milling cutter for machining the curved surface. Therefore, the blank processing can reduce the total processing time and improve the processing. Accuracy and reduced production costs.
(Finish)
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