Lathe boring hole method of floating car Necessity and feasibility of maintenance and renovation of C
Clamping is an important part of the clamping process of the workpiece. The workpiece positioning clamping force must be generated by certain institutions, the workpiece is pressed on the positioning element, so as to keep the position accurately, not because of cutting force, workpiece gravity, CNC lathe centrifugal force or inertial force and position change and vibration, to ensure the machining accuracy and safety operation. This mechanism, which produces clamping force, is called a clamping device. (1) the basic requirements for the clamping device (1) the clamping process is reliable and does not change the correct position after the workpiece is located. (2) the size of clamping force is appropriate. It is necessary to ensure that the workpiece is stable in position and small in vibration, and the workpiece will not generate excessive clamping deformation. (3) the operation is simple, convenient, labor-saving and safe. (4) the structure of the NC lathe is simple and compact, and it is convenient for manufacturing and maintenance. (two) the choice of the direction of the clamping force and the point of action (1) the clamping force should be directed toward the main positioning datum. The workpiece is boring and / 4 surfaces have verticality, so the A surface is the main base surface while the clamping force is F. The direction of the clamping force should be directed / 4. If the clamping force B regime, due to the angle error of CNC lathe work side and bottom surface of B / 4, clamping position of the workpiece are destroyed, and the influence of the verticality of hole / 4 requirements. The point of action of the clamping force of the CNC lathe plant (2) should fall within the support range of the positioning element and be close to the geometric center of the supporting element. The clamping force acts outside the supporting surface, which leads to the inclination and movement of the workpiece, and destroys the position of the workpiece. (3) the direction of the clamping force should be beneficial to reduce the size of the clamping force. When drilling the A hole, the clamping force of the reed J and the axial cutting force are F. The direction of the workpiece gravity C is the same, and the clamping force required for the machining process is minimal. (4) the direction and point of action of the clamping force should be applied to the better direction and position of the rigidity of the CNC lathe. Axial stiffness of thin-walled than radial of good performance, should be applied along the axial clamping force; thin-walled box clamping, just be applied to NC lathe factory good flange box; no collar, single point clamping can be changed to three point clamping. (5) the point of action of clamping force should be as close to the workpiece surface as possible. In order to improve the rigidity of the workpiece and prevent or reduce the vibration of the workpiece, the point of action of the clamping force should be as close to the machining surface as possible. When the fork is clamped, the main clamping force F is vertical acting on the main locating base surface, and the auxiliary support near the processing surface is applied. If the appropriate auxiliary clamping force is applied, the installation stiffness of the workpiece can be increased. (three) the size of clamping force is estimated by the size of clamping force, which is related to the reliability of workpiece installation, the deformation of workpiece and fixture, the complexity of clamping mechanism and so on. In the process of processing, the workpiece is affected by the cutting force, the centrifugal force, the inertia force and the self gravity of the workpiece. The cutting force (moment) plays a decisive role in the processing of small and medium workpieces under the general condition of numerical control lathe. When the heavy and large work pieces are processed, the effect of the gravity of the workpiece must be considered. The effect of centrifugal force or inertia force on the clamping effect can not be ignored when the workpiece is machined under high speed motion. In addition, the cutting force itself is a dynamic load, and it is also changed during the process. The size of the clamping force is also related to the stiffness of the process system and the transmission efficiency of the clamping mechanism. Therefore, the calculation of the size of the clamping force is a very complicated problem, and it is generally only a rough estimate. For simplicity, in low speed processing determined clamping force hours, only consider the cutting force (torque) influence on clamping, and assuming that the CNC lathe technology system is rigid, the cutting process is stable, according to the instantaneous state of the processing of the most unfavorable clamping, the clamping force required by the size of the balance principle of Jing Liping and then multiplied by the safety factor as the actual required clamping force of CNC lathe factory, namely Fj=kF type in Fj - the actual required clamping force; F, under certain conditions, the clamping force is calculated according to the static balance; K: safety coefficient, change and process system considering cutting force deformation and other factors, generally take A two 1.5 - 3. In practice, NC lathe is not a CNC lathe factory. All cases need to calculate clamping force. Manual clamping mechanism usually determines clamping force based on experience or analogy. If it is really necessary to calculate the clamping force more accurately, the above method can be used to calculate the size of the clamping force.
Clamping is an important part of the clamping process of the workpiece. The workpiece positioning clamping force must be generated by certain institutions, the workpiece is pressed on the positioning element, so as to keep the position accurately, not because of cutting force, workpiece gravity, CNC lathe centrifugal force or inertial force and position change and vibration, to ensure the machining accuracy and safety operation. This mechanism, which produces clamping force, is called a clamping device. (1) the basic requirements for the clamping device (1) the clamping process is reliable and does not change the correct position after the workpiece is located. (2) the size of clamping force is appropriate. It is necessary to ensure that the workpiece is stable in position and small in vibration, and the workpiece will not generate excessive clamping deformation. (3) the operation is simple, convenient, labor-saving and safe. (4) the structure of the NC lathe is simple and compact, and it is convenient for manufacturing and maintenance. (two) the choice of the direction of the clamping force and the point of action (1) the clamping force should be directed toward the main positioning datum. The workpiece is boring and / 4 surfaces have verticality, so the A surface is the main base surface while the clamping force is F. The direction of the clamping force should be directed / 4. If the clamping force B regime, due to the angle error of CNC lathe work side and bottom surface of B / 4, clamping position of the workpiece are destroyed, and the influence of the verticality of hole / 4 requirements. The point of action of the clamping force of the CNC lathe plant (2) should fall within the support range of the positioning element and be close to the geometric center of the supporting element. The clamping force acts outside the supporting surface, which leads to the inclination and movement of the workpiece, and destroys the position of the workpiece. (3) the direction of the clamping force should be beneficial to reduce the size of the clamping force. When drilling the A hole, the clamping force of the reed J and the axial cutting force are F. The direction of the workpiece gravity C is the same, and the clamping force required for the machining process is minimal. (4) the direction and point of action of the clamping force should be applied to the better direction and position of the rigidity of the CNC lathe. Axial stiffness of thin-walled than radial of good performance, should be applied along the axial clamping force; thin-walled box clamping, just be applied to NC lathe factory good flange box; no collar, single point clamping can be changed to three point clamping. (5) the point of action of clamping force should be as close to the workpiece surface as possible. In order to improve the rigidity of the workpiece and prevent or reduce the vibration of the workpiece, the point of action of the clamping force should be as close to the machining surface as possible. When the fork is clamped, the main clamping force F is vertical acting on the main locating base surface, and the auxiliary support near the processing surface is applied. If the appropriate auxiliary clamping force is applied, the installation stiffness of the workpiece can be increased. (three) the size of clamping force is estimated by the size of clamping force, which is related to the reliability of workpiece installation, the deformation of workpiece and fixture, the complexity of clamping mechanism and so on. In the process of processing, the workpiece is affected by the cutting force, the centrifugal force, the inertia force and the self gravity of the workpiece. The cutting force (moment) plays a decisive role in the processing of small and medium workpieces under the general condition of numerical control lathe. When the heavy and large work pieces are processed, the effect of the gravity of the workpiece must be considered. The effect of centrifugal force or inertia force on the clamping effect can not be ignored when the workpiece is machined under high speed motion. In addition, the cutting force itself is a dynamic load, and it is also changed during the process. The size of the clamping force is also related to the stiffness of the process system and the transmission efficiency of the clamping mechanism. Therefore, the calculation of the size of the clamping force is a very complicated problem, and it is generally only a rough estimate. For simplicity, in low speed processing determined clamping force hours, only consider the cutting force (torque) influence on clamping, and assuming that the CNC lathe technology system is rigid, the cutting process is stable, according to the instantaneous state of the processing of the most unfavorable clamping, the clamping force required by the size of the balance principle of Jing Liping and then multiplied by the safety factor as the actual required clamping force of CNC lathe factory, namely Fj=kF type in Fj - the actual required clamping force; F, under certain conditions, the clamping force is calculated according to the static balance; K: safety coefficient, change and process system considering cutting force deformation and other factors, generally take A two 1.5 - 3. In practice, NC lathe is not a CNC lathe factory. All cases need to calculate clamping force. Manual clamping mechanism usually determines clamping force based on experience or analogy. If it is really necessary to calculate the clamping force more accurately, the above method can be used to calculate the size of the clamping force.