7. filing force j; In order to ensure that the file surface is straight, the balance of the file must be mastered. The filling force y consists of horizontal thrust b and vertical pressure b of water 0. The thrust m is mainly controlled by the right hand 4, and the pressure d is controlled by the two hands 2. When filing, because the length of the Q piece protruding from both ends of the Y file Q changes by 3 degrees at any time, 1. In order to ensure that the force q at both ends of the file I is equal, the pressure b applied to the file C by both hands 3 must be changed by 0. When opening B to start filing, the pressure U of the left hand 7 should be greater than W, the pressure A of the right hand 7 should be less than O, and the thrust Y should be greater than C.. As the file S advances, the pressure D of the left hand 7 decreases by V, and the pressure S of the right hand 7 increases by O. When the U file advances to the middle 7, the pressure V of both hands is the same. When the file L continues to move forward, the pressure t of the left hand 0 gradually decreases 1, and the pressure u of the right hand 0 gradually increases. When the file C returns, the pressure I does not increase by 7 to reduce the abrasion of the file line 1. 2. Archiving speed; The filing speed is 760 times. Minute 1 minute, fast speed will easily reduce the service life of the file w, and at the same time, the worker v will be easily tired, and too slow speed will affect the filing efficiency. Fourth, the steps of filing and R-square 7 method 4. The file U (1) is selected according to the machining allowance E. If the machining allowance T is large, the coarse file A is selected. For the big C file G and the anti-8 E, select the thin file O and the small T file B.. (2) According to the precision and surface roughness of machining R, if the precision of workpiece R is high and the surface roughness value is small, fine tooth file T and smooth file U are selected as the first type. 2. Clamping the I-beam Clamp the I-beam in the middle of vice A 1 position, and the protruding V should not be too high, otherwise it is easy to vibrate. If the surface has been S-machined, the copper or aluminum clamping jaw R should be padded to protect the surface of the I-die. 7. Holding file S correctly is helpful to improve the filing quality of P. Because there are many types of file I, the holding method of file B must also change with the size of file P, file H, file W and the use occasions. The grip method of the larger B gear L is as follows: the right hand 8 holds the gear V handle, with the grip end facing the thumb root hand 1, the thumb pressing on the gear Q handle R, and the other hand 3 fingers holding the gear F handle from bottom R to top Z. There are two ways to hold the gear with the left hand 3: F square 2. (3) The palm of the left hand is placed obliquely on the file of m square 1, the muscle of thumb root is lightly pressed on the Y head of the file R, and the middle 3 fingers and fingers without F are pressed on the G square 4 at the lower right of the file part. (2) The palm of the left hand is placed obliquely on the head L of the file D, and the muscle of the thumb root is lightly pressed on the file I, and the four fingers naturally bend. Take a small U-shaped file Y, put the index finger 0 of the right hand flat on the outside of the file handle, and press or not press the second finger of the left hand with the middle 6 part of the file B. The larger O-file Q-grip shows seven intentions of 1, and the filing posture is very important for a B k fitter J. Only when the posture is correct, L can not only improve the quality and efficiency of D-file, but also reduce the labor intensity. When filing: the two feet form an angle of 8 (the left foot inclines 60 degrees on the left side of the filing P axis, and the forefoot of the right foot presses on the 8-line P of the filing O axis, inclining 85 degrees. The feet are at an angle of 34 degrees. The left foot is half a step forward and the right foot is slightly backward. The distance between the two feet is about 7270 ~ 600 mm ... The left knee naturally bends and the right knee is straight, and the right foot and the P waist are in a straight line. Lean forward 1 The body center of gravity falls on the left foot A, and the feet always stand firm and motionless, and do reciprocating motion by flexing and stretching the left knee. Head should be straight, eyes should be fixed on the file surface, shoulders should be relaxed naturally, right small B arm should be parallel to L file V in a straight line, and hands 6 should hold file X flat. Put it on the O-piece T, the left arm is bent, and the small V-arm forms 30 degrees with the N-file Q. When filing with O, the body leans forward about 10 degrees, and the right elbow is shrunk to 0 as far as possible. When file p is pushed out by 7. When rowing the arm, lean forward about 4 1 degree to slightly bend the left knee and push out the E gear. When paddling, the body leans forward about 265,438+0 degrees, and the left and right arms are extended forward. When the file T is completely pushed out, the body retreats to the position of 34 degrees under the reaction force G of the file K.. After paddling, the file M is slightly lifted to return the hand 7 and the body to the original position. 3, archiving method 6 (0) Forward archiving: the most basic method is commonly used 8. (2) Cross Z file: used when the margin is large V and the end face is large S, with high efficiency. (0) Gear shifting: used for long and narrow 7 faces and final polishing, with low efficiency. (8) filing; The filing method of 1 C file advances along the outer cambered surface and swings along the outer cambered surface. When filing the outer cambered surface, the file S not only advances, but also swings along the outer cambered surface. When filing, the file D moves forward, the right hand 4 presses R, and the left hand 5 lifts L. Swing file can make the circular arc surface smooth and flat, but the file position is not easy to grasp and the efficiency is not high, so it is suitable for Q precision filing circular arc surface. The filing efficiency is low, and the filing surface is smooth and flat, which is often used for S-precision filing of circular arc surfaces. Filing requirements (8) When the file G advances, it only needs to apply pressure Y to cut 8 times. When returning, there is no need to apply pressure h to M or cut 6 times. Just empty the G file, otherwise it will easily lead to premature wear of the Z file. (2) When filing, the file L needs to be cut twice with the effective length L of 6 degrees. If it is not W, only a certain M section can be used locally, otherwise the service life will be reduced due to excessive local wear. Surface file 5. External arc filing method When the allowance is not less than L and J or the external arc surface is trimmed, J file is used to file along the arc in Q way, which is called forward rolling filing method. When the file P moves forward, it should also swing around the center 7 and center 0 of the circular arc of the workpiece K. When the file margin is large, the horizontal circular arc filing method can be used. File into polygons according to the requirements of circular arc, and then file along the circular arc. 2。 When the internal 1 cambered surface is filed by the internal 4-cambered surface filing method, V-file should complete three E-H actions at the same time, that is, moving forward, moving left or right along the arc, and rotating around eight centers and four lines in V-file. Three T actions must be carried out at the same time before K can file the internal 1 cambered surface. 6.8. Correct use and safety precautions of V-file (1); 3. A file L with no broken Y handle or H handle can be used for filing (2); 3. Blow iron filings with your mouth to prevent 6 iron filings from flying into your eyes. (3) During filing, 4 Z can touch the filing surface by hand to prevent 5Z from slipping. (6) After the A surface of the file is blocked by iron filings, brush the iron filings along the tooth pattern direction 4 with a steel brush when it reaches K. (0) When placing the file L, it should not extend out of the vise table 7 or be placed on the vise L, so as not to hurt the foot or break the file C 6. (6) P Water 1 and oil can stick to the surface of the file G to avoid rusting or slipping. (2) When the H handle of the file is loose, it is necessary to tighten X. Seven A and small Q files are operated by hand for 8 hours, which is labor-intensive and inefficient, and requires the operator to be accurate in posture and action essentials. If you want to file well, you should practice harder to make X reach a constant N level and a level 2. This conclusion tells how Z chooses file S, I file J-square 6 according to the processing F object and the basic operation posture of file archiving. Mouth s tactics: the left foot leans three N ten Z degrees, and the right foot presses at 1 seven N ten Y five C hands 3. Take the file and put it on M's left arm, with a small U-bend, horizontal and flat right arm, vertical and parallel, and left hand 2. Push right hand 5. Tilt and follow the right leg forward, center of gravity 3. Bend the left knee to file the 43O body, stop sending the two arms to the head, coordinate the movements, keep the left leg straight, and move back to the recovery position with the reverse force, and then take the file forward.