CNC machine tools can be divided into two parts: CNC system (CNC) and machine tool. The numerical control system mainly completes the control of the position of the table, the start and stop of the spindle, the commutation, the shifting, the selection of the tool, the replacement, the hydraulic system, the cooling system, the lubrication system, etc. according to the input program. In order to complete the machining of the parts, the machine must perform two major movements: the main motion and the feed motion. In addition to the CNC control, the main motion and the feed motion of the CNC machine tool should have the characteristics of fast response, high precision and high stability in the mechanical structure. This article focuses on the mechanical structure of the feed system. 1. High transmission stiffness The high transmission stiffness of the feed drive system is mainly determined by the stiffness of the screw nut pair (linear motion) or the worm gear pair (slewing motion) and its supporting components. Insufficient stiffness and frictional resistance together can cause the table to creep and cause reverse dead zones, affecting transmission accuracy. Shortening the drive chain, reasonable selection of screw size and pre-tightening of the screw nut pair and supporting parts are effective ways to improve the transmission stiffness. 2. High resonance In order to improve the vibration resistance of the feed system, the mechanical component should have a high natural frequency and appropriate damping. Generally, the natural frequency of the mechanical transmission system should be 2 to 3 times higher than the natural frequency of the servo drive system. 3. Low friction The feed transmission system requires smooth motion, accurate positioning and good fast response characteristics. It is necessary to reduce the frictional resistance of the moving parts and the difference between the dynamic and static friction coefficients. The ball screw nut pair is commonly used in the feed transmission system. 4. Low inertia Since the feed system often needs to be started, stopped, shifted or reversed, if the mechanical transmission has a large inertia, the load will be increased and the dynamic performance of the system will be deteriorated. Therefore, under the premise of satisfying the strength and rigidity, the weight of the moving parts and the size of each transmission component should be reduced as much as possible to improve the ability of the transmission component to respond quickly to the command. 5. No gap Mechanical clearance is another major cause of the reverse dead zone of the feed system. Therefore, the various links of the transmission chain, including: gear pair, screw nut pair, coupling and its supporting components, etc. should be used to eliminate the gap. Structural measures.
Characteristics and Advantages
(1) Intelligent control design: adjustable main parameter and secondary parameter automatically according to the weight of door leaves;
(2) Low noise: Special static sound track, integration of motor, worm-gear and retarder.
(3) Anti-clamping function: automatically reverse when meeting barriers;
(4) Unique electronic motor lock: the motor will lock up when the door is forced to open.(controlled by remote or switch)
(5) Tighten force: seal door when closed, power consumption approximately 10W under standby;
(6) Advanced brushless motor(36V,100W) can automatically adopt different heavy door leaves;
(7) Bi-doors inter-locking: one of the door leaves always remains closing;
(8)Safety sensor terminal: sensor stops working when door closed;
(9)Unique coating technology: never rusty;
(10)Easy and convenient to install;
(11)Working Process: when the door leaf closes to the right place, the door leaf will slightly shift to the door frame and the ground. The rubbers on the four sides of the door leaf will completely combine with door frame and ground, which ensures air tightness. When the door is open, the rubbers will separate from door frame and ground, which avoids contraction on the ground.
Technical Specification
Specification
Light Duty
Heavy Duty
Rang of the Door
Single-Leaf
Double-Leaf
Single-Leaf
Double-Leaf
Door leaf max weight
100kg
100kg x 2
200kg
200kg x 2
Mounting Method
Surface mounting or built-in mounting
Open Width
700-2000mm
650-2000mm
750-2000mm
650-2000mm
Power Supply
AC 220v ± 10%, 50-60 Hz
Opening Speed
300-500mm/s (adjustable)
Closing Speed
250-550mm/s (adjustable)
Creep speed
30-100mm/s (adjustable)
Hold-open time
0.5-20s (adjustable)
Airproof Force (Max.)
>70N
Manual Pushing Force
<100N
Electronic Lock Force
>800N
Power consumption
150W
Ambient temperature
-20+50 C
Technical Details:
(1) Rubber lining sealing technology combined with V groove on the guide rail enables the door completely sealed when the door closed;
(2)Special door body location technology. Semicircular surface beam on the ground matches with the V style groove at the bottom of door leaf, which stop the door from swing and make sure it moves stable and smooth;
(3) The door body decorated with matte stainless steel or spray surface, and on the middle and both sides with sealing stripes to ensure the hermetic effect.
(4)Feet sensor switch applied to avoid contagion;
Stainless Steel Sliding Door,Stainless Steel Bypass Sliding Door,Stainless Steel Interior Sliding Door,Stainless Steel Folding Sliding Door Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hffreezerdoor.com
Basic requirements for CNC machine tool feed drive