Research and use of spiral CNC production process
Cylindrical curved spiral groove has a variety of functions, in the packaging device, textile device or motorcycle parts to meet a specific drive track requirements; in the rubber product mold, to meet the special pattern of the rubber product surface; The aerospace components act as heat sinks. The spiral groove is divided into a equal lead spiral groove and a variable lead spiral groove according to whether the lead is equal. According to whether the groove width is equal in the groove depth direction, it is divided into ordinary spiral grooves as shown and wedge spiral grooves as shown. The equal-path spiral groove can be processed by ordinary machine tools, but the precision is difficult to guarantee, and the variable lead spiral groove can only be processed by special equipment, but the production cycle is long, which seriously affects the manufacturing progress of the product. With the development of CNC machining technology, CNC machining can meet the processing requirements of various types of spiral grooves, but the CNC machining programming of these parts is different from the general surface machining programming. In this paper, the numerical control machining of cylindrical spiral groove is studied. 1 Cylinder surface spiral line The center line and contour line of the spiral groove are spiral lines, which can be seen as the moving point Q. As shown, the trajectory formed by the spiral motion around the axis on the cylinder surface. When the cylinder axis is the X axis, if the deflection angle of its radius line with respect to the coordinate plane XOY is, the spiral equation is: (1) In equation (1), (2) is the spiral lead, when it is the equal lead, it is constant P, then (3) when it is the variable lead, it is the variable that changes with x; k determines the thread rotation Direction, when k=+1, it is right-handed, when k=-1, it is left-handed; β is a helix angle; it is the diameter of the cylinder. 2 spiral groove CNC machining 2.1 CNC machine tool selection and processing method Because the cylindrical spiral groove has a rotary center, the machine tool selected for the numerical control machining of the spiral groove must have a rotary axis. This paper selects four coordinates (X, Y, Z, A). CNC machining center, the rotary axis is the X axis, and the tool axis direction is the Z axis. At least two axes (X-axis and A-axis linkage, Y-axis and Z-axis linkage) must be linked during machining. The spiral groove is usually determined by the lead and number of heads, depth and width, and the shape and direction of the spiral groove. When machining a common spiral groove, if the groove width is small, a flat-bottomed cutter with the same diameter as the groove width can be selected. If the diameter D 1 of the milling cutter is equal to the groove width W, the layering cutting is performed according to the depth of the spiral groove during processing. Yes. If the spiral groove width is too large and the cutter diameter D 2 is smaller than the groove width W, it is necessary to perform the cutter several times. The optimal tool path is to move from the middle of the slot and then to the spiral groove contour. The final tool path is the spiral after the spiral groove profile is offset by a tool radius, as shown. Proper delamination is also performed according to the depth of the spiral groove during processing. There are two ways to machine a wedge-shaped spiral groove. The first is to use a profile cutter to ensure the shape of the wedge face. When machining, it can be roughed by ordinary flat-bottom end mill, and finally finished by special-shaped milling cutter. The shape of the wedge groove is guaranteed by the forming tool. In this method, the direction of the tool axis always passes through the center line of the cylinder. The second method is to use a common flat-bottom end mill. Both roughing and wedge-face finishing use ordinary end mills. The wedge profile angle is achieved by changing the relative angle between the tool and the part, so that the part is rotated by an angle. And moving a certain distance in the radial direction, as shown by the angle θ and the distance Δy. 2.2 CNC programming 1) Equal lead ordinary spiral groove machining tool path is a spiral, the programming command is to make the machining tool () simply take a spiral, relatively simple, generally two instructions can be achieved. The first command shifts the tool to the starting point of the tool path and the second command causes the tool to be machined in a spiral path. As shown below: G1 X 0 Y 0 Z 0 A 0 G1 X 1 A 1 During processing, the Y and Z coordinates remain unchanged, and the relationship between X 1 and A 1 is φ and x in (3) The relationship is as follows: where k and P are the same as (3). When the spiral groove is wider and requires a few passes to complete, this requires moving the starting point of the pass. The programming command is: G1 X 0 "Y 0 " Z 0 A 0 G1 X 1 A 1 where: where w is the slot width and D is the tool diameter, as shown. β is a helix angle, k is the same as (3); the relationship between X 1 and A 1 is as follows: where k, P are the same as formula (3). 2) When the lead wedge type spiral groove is finally finished by the forming tool, the programming method is the same as that of the ordinary lead spiral groove. When the final finishing is performed by the ordinary end mill, the starting point coordinates Y and A of the tool path are changed relative to the ordinary spiral groove, and the change value of A is the inclination angle θ of the wedge spiral groove side wall, and the change value of the starting point coordinate Y is according to the wedge shape. The spiral groove side wall inclination angle θ, the spiral groove depth, and the spiral groove width were calculated. The machining tool path is the same as the ordinary spiral groove and is also a spiral. 3) Variable lead path spiral groove change lead The machining tool path of the spiral groove is a variable lead spiral. During the programming, the spiral line is interpolated, and the step size is determined according to the machining tolerance, thus determining the NC program knife. The locus, the instruction is as follows: G1 X 0 Y 0 Z 0 A 0 G1 X 1 Y 0 Z 0 A 1...G1 X i Y 0 Z 0 A ii=1, 2, 3... In a machining tool path, the coordinates Y and Z remain unchanged, Z is equal to the sum of the bottom radius of the spiral groove and the height of the lifting knife, and the height of the lifting knife is related to the layering processing. The coordinates A and X are changing, and the relationship between the coordinates A and X is the relationship between φ and x in (2). 4) When there are multiple spiral grooves on the cylinder, since the shapes are the same, only the starting position of each spiral groove is different, so only one spiral groove is required to be numerically programmed, and the other grooves are realized by the cycle instruction during processing. 3 Conclusion The cylindrical spiral groove numerical control machining method proposed in this paper has been applied in the machining of multiple parts, which proves that it is practical and feasible. Shown is a screw that achieves a specific motion, using the method described herein, after machining the part is measured by the measuring machine to meet the design requirements. (Finish) 180 M3/h Concrete Batching Plants
It is assembled by building blocks, which is short, quick and convenient.It is convenient and quick to use the cylinder discharge or electric push rod to discharge.It is assembled by building blocks, which is short, quick and convenient.It is convenient and quick to use the cylinder discharge or electric push rod to discharge.A variety of mixing processes, highly automated, high production efficiency,Environmental protection and energy saving, using pulse dust removal, recycling waste-water for reuse.This product(concrete batching plant) is a fully automatic concrete mixing equipment consisting of five systems of mixing, electrical control, storage, conveying and weighing.This product(concrete batching plant)mainly consists of 5 major systems such as mixer, material weighing system, material conveying system, material storage system and control system and other ancillary facilities.
This product(concrete batching plant) is equipped with the storage, batching, conveying, stirring, control and other devices of various raw materials required for precast concrete, and various aggregates, powders, admixtures, water, etc. A complete set of equipment for supplying concrete in a concentrated manner than by a mixer. 180M3/H Concrete Plant Machine,Hzs180 Concrete Batching Plant,180M3/H Concrete Mixing Plant,180M3/H Concrete Mixing Plant Machine Shandong Zeyu Heavy Industry Science and Technology Co.,Ltd. , https://www.sdjzcseriesdrumconcretemixer.com