5 tine comb tine of the first thick car is opposite the knife treatment slants the influence of echelon whorl

Company of PMC of use United States of processing factory of valve of company of Tianjin steel tube produces 1077 model inside oil of treatment of machine tool of silk of car of whorl numerical control receives band to slant echelon whorl, the avulsion that asks Ying Moming of the whorl that receive bind round is shown, Dao Wen, grind the blemish such as mark, did not destroy the flaw with successional whorl inside complete whorl length.  1077 model machine tool of silk of numerical control car is the center turns tower type 4 labour machine tool of special numerical control, comb by knife figuration. Treatment efficiency and precision are tall, can machine 10 3/4 of ～ of ″ of dimension 4 1/2 the steel tube of ″ . Cutting characteristic is cutting tool rotates, workpiece is not moved. Use tine of rectangular and bosseyed belt to comb knife, the horn before cutting tool is 0 ° , can make sure taller whorl precision and surface are bright and clean degree, and error of tooth form distortion is small. In cutting, comb the knife ages one by one attends cutting 5 times, make cutting tool and arbor bore very great cutting power, this brought bad influence to thread machining, comb with respect to 5 tine knife cutting gets power below this one problem undertakes an analysis.  1.

The academic surplus that 5 tine comb the knife ages each allocates stone vitta whorl to comb the knife is a kind efficient shape cutting tool, designing a medium crucial link is affirmatory and reasonable cutting graph, it is to consider the cutting bear of every tine to allocate rationality; The 2 mental allowance rationality that are tine of consideration fine vehicle, comb the knife has a few a tooth-like part of anything no matter, the last it is fine vehicle tine, its cutting is sectional should include a complete whorl tooth model, spend in order to make sure precision of whorl dentiform geometry and surface are bright and clean. The cutting of each tine allocates reasonable, concerning to comb knife life reachs bits result not only, return the precision that can affect work and exterior quality, accordingly, the cutting that combs the knife ages each allocates is the key in combing the knife is designed. Slant ladder buckles whorl tooth depth to be H, hypothesis mental allowance is H0. 5 tine comb the tooth of the knife is tine of tine of tine of tine of the 1st thick car, the 2nd thick car, the 3rd thick car, the 4th thick car and figuration tine respectively. The surplus after tine of the 1st thick car is machined is Δ X1=h - T4; The 2nd thick car ages the surplus after treatment is Δ X2=t3; The 3rd thick car ages the surplus after treatment is Δ X3=t2; The 4th thick car ages the surplus after treatment is Δ X4=t1; 5 tine shape complete top whorl is after aging treatment is finished, tooth depth is H. 2. Cutting tool is machining  of medium circumstance getting power actually to be in treatment process (cutting of feed of the cutting tool in be being machined suppose, workpiece rotates) , cutting tool basically is come from the influence of 3 fields force: Workpiece is anticlockwise the obstruction A of direction of rotation, the cutting obstruction B of direction of cutting tool feed and cutting tool and workpiece contact cutting obstruction C of direction. Because come from the obstruction on the obstruction A on workpiece direction of rotation and direction of cutting tool feed,B won't affect the tooth form of whorl to machine, so here considers to come from cutting tool and workpiece contact direction only (X axis direction is on common machine tool) the influence of the obstruction C that go up. 3. When the change that cutting tool machines below impact of condition getting power assumes when the 1st thick car tine contacts workpiece, what suffer force to be F1, generation deflection is δ 1; When tine of the 2nd thick car contacts workpiece, suffer force to be F2, deflection is δ 2; When tine of the 3rd thick car contacts workpiece, suffer force to be F3, deflection is δ 3; When tine of the 4th thick car begins cutting, suffer force to be F4, deflection is δ 4, the 5th tine namely when cutting of fine vehicle tine, suffer force to be F5, deflection is δ 5. Comb when 5 tine all tine attend the knife at the same time when cutting, suffer force to achieve a balance, arise no longer be out of shape. Comb by 5 tine the structure of the knife can see, the coping that X axis just suffers muscularity to every come from to age more on cutting tool to what go up (namely with workpiece most contact a part first) , when the 2nd thick car so tine begins cutting when, for δ Max2 ＝ with the biggest deflection that can arise between tine of the 1st thick car the 1st thick car ages and the tooth depth on cone of edge of tine of the 2nd thick car differs ＝ T4 - T3; With this analogize, t3 of δ Max3 ＝ - T2; T2 of δ Max4 ＝ - T1; T1 of δ Max5 ＝ . So 1 ＋ of δ of ＝ of ∑ δ Max δ of ＋ of T4 of ＝ of Max5 of δ of ＋ of Max4 of δ of ＋ of Max3 of δ of δ Max2 ＋ 1. Accordingly, the Max of δ of ∑ of H= of the biggest variable Δ that figuration tine ages relative to the first thick car - 1 ＝ of δ T4. Figuration ages tooth depth is H, criterion H of ＋ of T4 of ＝ of H of Δ H ＋ . The 1st thick car ages left bottom is H ＝ T5 high, apparent, tine bottom divides H of ＋ of T5 ＜ T4 on the right side of tine of the 1st thick car, go up in workpiece the 1st buckle made inclined plane to will not be aged enclothe by figuration, in workpiece the 1st buckle on form not complete whorl. But as the 2nd, the 3rd, tine of the 4th thick car and figuration age in succession cutting, suffer force to tend evenly, be out of shape reduce gradually, the not complete whorl on workpiece is in the 3rd, the 4th buckle go up to disappear gradually. Because be according to the biggest be out of shape undertake calculative, so figuration ages the tooth depth after treatment won't produce unacceptable state, be being measured actually also is such. In treatment, be like workpiece the 1st, the 2nd buckle on form not complete whorl, can cause pipe to discard as useless.  basis afore-mentioned analysises, have the following test: Comb the 5 tine of H of ＋ of T5 ＜ T4 after knife nap, assure  of H of ＋ of T5 ＞ T4, in be being machined, before can avoiding workpiece to go up 1, 2 buckle on produce not complete whorl. In actual production, treatment is out of shape is overcome very hard, to make cutting tool gets used to production better, in the design 5 tine comb when the knife, should mature the influence that the first thick car ages tine bottom is in, assure H of ＋ of T5 ＞ T4. Such 5 tine comb the knife will reduce the effect of tine of the 1st thick car to thread machining, improve product quality thereby. CNC Milling