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    Convex Parts Milling Machining

    Writer: Kangding metal Pubdate:2018-03-19 Source:CNC Machining Factory
    Description:Milling Machining Technology And technology Of Convex parts 1.1 Manufacturing Services: CNC Milling, Deburring, Blunt Tips, Custom Pentagon Size, sanding and finishing Materials: High Carbide Steel Master Patterns: high speed steel milling...

    Milling Machining Technology And technology Of Convex parts

    1.The Product
    Manufacturing Services: CNC Milling, Deburring, Blunt Tips, Custom Pentagon Size, sanding and finishing
    Materials: High Carbide Steel
    Master Patterns: high speed steel milling cutter change the forging
    Quantity: 10 sets of complete convex part samples
    Lead Time: 5 days
    convex part drawing

    2. Technology analysis
    2.1 Parts Diagram Analysis
    Convex part spare part number,The surface of the part is composed of pentagonal, chamfered quadrilateral, four blind holes, a circular groove and other surfaces.
    Dimensions are complete,
    Forging blank 45 is selection of 96mm × 96mm, and no heat treatment and hardness requirements.


    2.3 Determine the processing method

    The principle of selection of the processing method is to ensure the accuracy and roughness of the surface of the part. Because there are generally many methods for obtaining the same level of precision and surface roughness, Therefore, in the actual selection, it is necessary to fully consider the shape, size, shape and position tolerance requirements of the parts.
    Through the above graphic data analysis, considering the efficiency of processing and the economy of processing, the most ideal machining method is milling, using CNC milling machine.


    2.4 determination processing program
    The machining of precision surfaces on parts, Milling machines are often achieved gradually by roughing and finishing.
    It is not enough to select the appropriate final processing method for these surfaces based only on quality requirements. The processing plan from the blank to the final forming should also be correctly determined.

    Use a vise to hold the bottom, 96mmX96mm size of the rough opening is 50mm high, Machined surface, plus 96mmx96mm quadrangular shape, Machining 90mmX90mm shape, machining pentagonal shape, machining inner groove, machining blind hole

    The convex part processing sequence is:

    Preparatory processing---Open coarse 96mmX96mm high 50mm---Milling Surface ---Rough milling 96mmX96mm contour--- Rough milling of pentagons---Roughing of inner slots ---Finishing Milling Machine 96mmX96mm Profile--- Rough milling 90mmX90mm profile---Fine milling pentagonal contour---Fine milling inner groove ---Drilling blind hole.

    Workpiece clamping

    3.1 Selection of positioning criteria:
    In the development of the part processing process specification, the correct selection of the workpiece positioning reference is of great significance. The quality of the positioning reference selection not only affects the positional accuracy of the part processing. And it also has a great influence on the processing sequence of the parts on the various surfaces. Reasonable choice of positioning reference is a prerequisite to ensure the accuracy of the part processing, but also to simplify the processing process and improve processing efficiency.


    3.2 Determine the positioning reference of the part:
    With the bottom surface as the positioning reference

    3.3 CNC milling machine commonly used clamping methodUsing vise clamps, because the vise sliding surface and bottom surface, after precision grinding, accurate parallelism, vise body made of ductile iron FCD60, strong tensile strength, high wear resistance, not easily deformed. Vise sliding surface heat treatment HRC45 ° above, Maintaining long-term wear-resistance accuracy is best suited for general milling machines, CNC milling machines, machining, and mold manufacturing.

    This time is a one-time clamping, clamped with vise 20mm-30mm, reasonable degree of freedom of control.

      Plane area roughing

    Tool and cutting amount

    4.1 The following points can be considered when selecting the tool life depending on the complexity of the tool, the manufacturing and the cost of sharpening. The complex and high-precision tool life should be selected to be higher than the single-edged tool. For machine tools with indexable tools, due to the short tool change time, in order to give full play to its cutting performance and improve production efficiency, the tool life can be selected to be lower, generally taking 15-30min.

    4.2 Selecting Tools for CNC Milling
    This milling uses rack knives and tungsten steel to increase efficiency.

    4.3 Setting Tool Points and Tool Change Points
    Milling machine is generally used to center the knife, the workpiece is 100mm as a tool change point

    Quadrilateral finishing 

    Processing of parts
    5.1 Process Analysis of Convex Parts
    (1) Technical requirements

    The picture shows a convex part with low accuracy, and only the surface roughness is required. There is the inner groove must be guaranteed between plus and minus 0.02, the remaining accuracy is a free tolerance

    (2) Blank selection
    The blank used as the blank the 45mm forgings of 100mmX100mm and 55mm in height. Slightly larger than the picture size, In order to better report the requirements of the picture

    (3) Positioning reference selection
    In the milling machine, a plane is generally used as a positioning reference. In this graph, we use the bottom surface as a positioning reference.

    (4) Heat treatment process
    Before casting, forging blanks should be arranged in accordance with the material and technical requirements are normal fire annealing, in order to eliminate stress, improve the organization and cutting performance.

     The pentagonal finishing is basically the same as the quadrilateral finishing parameter

    5.2 convex parts processing technology
    (1) Determine the processing sequence and feed route

    The processing sequence is determined according to the principle of coarse to fine and near to far. Machining is a convex part, so its roughing of the outline of the discharge (remaining 0.5 of the machining allowance) allows the rough machining of the inner groove, and finally, the finishing shape, the finishing of the inner groove, and the drilling.

    (2) Select tool
    1) Overall roughing: Use φ80 face milling cutter for roughing
    2) Milling Roughing : Use φ16 Carbide Cutter to open the profile
    3) Roughing of the inner groove : Use φ10 carbide for roughing
    4) Finishing of inner and inner grooves: Use φ10 carbide for finishing
    5) Blind hole processing: Use φ10 twist drill for processing

     Contour roughing


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