2 machining principle on the machine. The utility model solves the problem that the universal machine tool can not process the variable pitch screw, greatly reduces the cost of adding the variable pitch screw, and paves the way for the design and application of the variable pitch screw.
The proposed variable pitch screw is an important basic part of modern packaging machinery. It has a wide range of applications in the parts feeding device. It can arrange regular or irregularly arranged batch objects, such as cylindrical sweat prisms and other The metal or non-metallic containers of the form are supplied to the packaging station in batches or one by one according to the given process requirements. In the process of feeding, it is also possible to complete the process requirements such as the increase and decrease of the divergence, the diversion, the hoisting and turning, or the turning over. For the above reasons, the application of the variable pitch screw in the filling and filling sealing labeling measurement and automatic packaging line is expanding.
However, the variable pitch screw has weaknesses in processing difficulties, which limits its application to a great extent. At present, variable pitch screws can only be machined on special machine tools. For general-purpose machine tools, ordinary machine tools and economical CNC machine tools do not have the command to process variable pitch screw rods, and cannot process variable pitch screws with combined spirals such as constant velocity section and equal acceleration section. For most manufacturers, machining variable pitch screws on general purpose machine tools can simplify the machining process and reduce the processing cost, which is of practical significance.
The universal machine tool of the variable screw screw has solved the processing of the pitch screw. The machining of the pitch screw has similarities and the same as the processing of the ordinary screw. The key point is that the pitch of the screw is If the pitch is changed enough, such as 1 can solve this key point, it is necessary to use a general-purpose machine tool to process the variable pitch screw. In order to achieve the processing of the eye distance screw, the following conditions are required: The machine tool spindle and the tool must maintain a strict motion relationship, that is, the small axis rotates, and the tool must be moved horizontally according to the requirements of the design spiral line, and The speed of the spindle is associated.
Because the tooth profile of the variable pitch screw is not possible, the cutter must be cut multiple times to get out of the tooth profile. Therefore, in the subsequent processing, the trajectory of the tool must coincide with the previous trajectory, that is, no stagnation phenomenon occurs.
It can process right-handed threads and can process left-handed threads.
The pitch parameter is adjustable.
Among them, 234 and the requirements for processing ordinary screws, Pu Ying's general machine tools can meet these requirements. Therefore, it can be concluded that if the stringer requirement can be realized on the machine tool, a variable pitch screw can be added to the ordinary machine tool. In view of this concept, a cam mechanism linked to the tool holder can be attached to the general machine tool, 1 to realize the spiral line meeting the requirements of the juice setting, and the drive system of the machine thread of the machine tool is used to process the variable pitch screw.
Structural principle of the additional cam mechanism The additional cam mechanism + is composed of a moving grooved cam, a single gear and two racks. In the following, the working principle of the right-handed thread is introduced as an example. At this time, the machine tool adopts the thread of the transmission chain, the tool holder of the cam-mounted machine tool, and the other parts of the four-tool holder are welcoming the bed of the machine tool. Body. The longitudinal rack and the lateral rack can move linearly in the guide rail of the bracket, and the two racks are geared in four gears. When the tool holder moves, the cam moves with the tool holder, and the cam pushes the longitudinal rack motion, the longitudinal tooth The movement of the strip is transmitted to the horizontal rack by gear ratio, and the cutter is mounted at the front end of the rack.
Thus, the helical thread of the machined variable pitch screw is formed by a cam mechanism, and other requirements are ensured by the machine-threaded transmission chain. In the processing of the left-handed thread, the cutting force will make the vertical 1; the rack will be out of contact with the cam wheel surface, and the groove cam can also ensure that the object to be fed by the knife movement is related, so the profile can be installed at the front of the transverse rack according to the situation. A mechanism is formed to form a particular helical groove axial section geometry.
The design of the cam is known from the above structure. In the coordinate system of 2, when the cam is a straight line of 45., the rack moves synchronously with the machine tool holder, that is, the equal pitch screw is processed at this time. When the cam is a pitch variable pitch screw. The wheel curve should be designed based on the pitch of the selected spindle speed tool holder. The method of rest can first draw the equal pitch line in the coordinates, that is, 45 lines, as the reference line; then divide the equal pitch 7 into equal parts with appropriate data, in other words, turn the + axis, the amount of movement of the tool Perform an equal division, and then change the design curve of the pitch screw to find the corresponding point on each bisector; finally, all the points are smoothly connected into a curve.
Taking into account the limitation of the pressure angle of the cam curve, the spindle of the machine tool should be rotated. The movement of the tool holder, that is, the thread of the machining tool, is selected to be greater than or equal to the variable pitch screw. The human pitch is not even the pressure angle of the cam curve. Greater than 45.
Conclusion The method described above can be used to achieve the processing of a variable screw screw by simply attaching a few attachments to the machine. These attachments can be easily disassembled, which can damage the structural performance of the machine. The use of the same cam to machine the pair of 1 screw and left-hand screw, reducing the influence of the machining error of the left and right screws on its performance, call the time to reduce the production of the cam 4. The principle can be used on ordinary machine tools, It can also be used on CNC machines that do not have the function of machining variable pitch threads. The variable pitch screw can be processed economically and accurately, and the design of the variable pitch screw is also not particularly good. Control technology for modern machine tools. Hai Tongji University Press, 1999.
Wang Runxiao and so on. The principle and system of machine tool numerical control. Northwestern Polytechnical University Press, 1997.
Xu Lincheng and so on. The principle and design of packaging machinery. Shanghai Science and Technology Press, 1988.
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