3D printer spray nozzle structure and method thereof for controlling speed and precision

A method for controlling speed and precision of a 3-dimensional printer spray nozzle structure;

• wherein a method for controlling printing speed comprises steps of:
• defining a printing speed V =K×S×L:
• wherein S is a cross section area of a filament actually sprayed by an extruder, L is a unit printing forming area, K is a printing related constant;
• determining a feeding speed by the cross section area S of the filament actually sprayed by the extruder and the unit printing forming area L, wherein a melting speed is also affected;
• the feeding speed and the melting speed together determine the printing speed;
• and
• forming a signal referring to changes of S and L for controlling the printing speed, which also adjusting the feeding speed of a feeding pipeline of a spray nozzle;
• wherein a method for controlling the printing precision comprises steps of:
• according to different precision requirements, adjusting the printing speed for controlling printing precision;
• wherein when high printing precision is required, the printing speed is slow;
• when low printing precision is required, the printing speed is high;
• wherein a rotation angle of the extruder is adjusted by a motor for changing the cross section area S of the filament actually sprayed by the extruder in a unit time;
• because a working moving speed of the spray nozzle is constant, for ensuring Z-axis forming heights of all layers are identical, the feeding speed of the feeding pipeline is real-time controlled according to the cross section area S of the filament actually sprayed by the extruder;
• the feeding speed equals in value to the melting speed of materials transported, and also equals to the printing speed V during printer working;
• wherein when an internal channel cross section shape of the feeding pipeline and an internal channel cross section shape of the extruder are both a triangle with a side length of 3a, the cross section area S of the filament actually sprayed by the extruder is:
• S
• =
• 9
• ⁢
• 3
• 4
• ⁢
• 1
• +
• tan
• 2
• ⁢
• θ
• 2
• 1
• +
• 3
• ⁢
• tan
• ⁢
• θ
• 2
• ⁢
• a
• 2
• wherein θ is a motor-driven rotation angle of the extruder.