Work efficiency.
The C7632 multi-blade semi-automatic lathe is a universal lathe for machining disc-type parts. The semi-automatic circulation of the original lathe is controlled by hydraulic and electrical joints. The hydraulic system consists of a variable oil pump and a combined control board. The electrical system uses a stepper control circuit. According to the process requirements of the machined parts, adjust the pin on the travel switch and the pin on the pin plate to select the required cycle action. The hydraulic system of the C7632 lathe mainly uses the variable pressure variable displacement pump as the power source. The longitudinal and lateral feed of the upper and lower tool holders are driven by four hydraulic cylinders. The control loop of each hydraulic cylinder adopts two speed control valves in series and two adjustments. Speed ​​mode, so each tool holder has five working conditions: fast forward, work advance, fast rewind, work retreat and stop. The hydraulic valve station is installed in an integrated block. The electrical system of the lathe consists of three parts, namely the main circuit, the 380V control circuit and the 24V DC control circuit. The 380V control loop controls three motors: the main drive motor, the hydraulic pump drive motor and the cooling pump drive motor. The main drive motor output outputs two different high and low speeds through the delta connection and the double star connection. Then, through the different meshing combination with the two sets of suspension wheels, the spindle can output eight different speeds.
The 24V DC control loop uses a stepping program logic to control the circuit, and cooperates with the latch plate and the stroke switch to control the action cycle of the upper and lower tool holders of the machine. The action cycle is based on the process requirements of the workpiece, appropriately adjusting the position of the stop switch arm and selecting the appropriate on/off state of the pin hole on the pin plate, and controlling the working conditions of each hydraulic cylinder through the electromagnetic reversing valve to realize the tool post automatic cycle. The upper and lower tool holders each have a latch plate, and each latch plate has a seven-step change action. The use of this stepping program control circuit to realize the tool holder action cycle requires more than 30 intermediate relays and nearly one hundred jacks to be realized. The number of components used is large, and the pin plate is broken down. Occurs, making the reliability of the system greatly reduced. In the event of a fault, the troubleshooting is more difficult and the production efficiency is reduced. At the same time, the automatic circulation of the tool holder is limited by the number of bolt holes. Each tool holder can only achieve a maximum of seven action steps. For some complicated shapes, it is divided into several operations. In order to realize, even if the parts with simple shape are processed, the steps of the rough and the precise operation cycle of the finished car are completed in two steps, and the degree of automation is low. Therefore, the promotion and use of this type of machine tools is greatly limited. Some manufacturers even use this type of machine tools for abandonment, resulting in waste of resources. 51. In response to this situation, after careful technical demonstration, we proposed a device for the Changchun plant. The transformation and transformation route of the machine tool control system by PLC, roughing and finishing is completed, and good results have been achieved.
1 The transformation of the electrical control system The main problem of the idle equipment is the 24V DC control loop. Therefore, it is decided to modify the electrical system of the machine according to the following principles.
The 380V control loop is basically unchanged, and the old electrical components are properly replaced; the 24V DC control loop is completely replaced by a programmable controller; roughing and finishing are completed by one process, and the route is re-arranged.
The buttons on the control loop, the manual control switch, the pressure control relay switch, the thermal relay contact, the travel switch are the programmable controller input points, and the block selection switch added on the control panel also serves as the input point of the programmable controller; The solenoid valve, contactor and block indicator in the control loop are the output contacts of the programmable controller. Through analysis, 58 input contacts and 15 output contacts are obtained. Therefore, the SIMATICS7-200 programmable controller with freely expandable modularity produced by Siemens AG of Germany is selected. The input/output contact address assignment of the programmable controller S7-200 is shown in Table 1. The modified PLC wiring diagram is determined according to the above transformation scheme.
Table 1 C7632 multi-tool semi-automatic transformation PLCI/O address allocation table input name input name input name total parking button lower tool holder manual longitudinal work retracting tool holder longitudinal row open hydraulic pump start button finishing lower tool holder longitudinal row open king shaft motor Start button roughing lower tool holder longitudinal row open hydraulic clutch switch process section I lower tool holder longitudinal line open work manual button process section lower tool holder longitudinal row open coolant motor switch process section in lower tool holder horizontal line open manual / automatic conversion Switching process section Han lower tool holder horizontal row opening automatic processing start button process section V lower tool holder horizontal row open upper tool holder jog button process section VI lower tool holder jog button upper knife row vertical opening output name upper tool holder manual Horizontally fast into the upper horizontal row of the knife holder hydraulic pump upper tool holder manual cross work into the upper tool holder longitudinal line open spindle motor upper tool holder manual horizontal retracting upper knife holder longitudinal row open cooling pump upper knife holder manual cross work retracting knife Vertical line open upper tool holder manual vertical fast forward spindle motor overload upper tool holder manual vertical oil pump motor overload upper tool holder manual vertical retreat cooling pump motor overload upper tool holder manual vertical retracting tool holder horizontal row opening knife Manually traverse into the upper turret horizontally open lower turret manual traversing into the upper turret horizontally open lower turret manual retracting upper turret horizontally open lower turret manual cross work retracting turret horizontally open Tool holder manual vertical fast into the lower knife holder horizontal line open lower knife holder manual vertical work into the lower knife holder horizontal line open lower knife holder manual vertical retract pressure gauge contact: C7632 semi-automatic lathe is through the upper and lower tool holder sequence action To achieve the cutting process, the movement of the upper and lower tool holders has two directions of vertical and horizontal, and the horizontal tool holder can be inclined at a certain angle around the turntable. The movement of the upper and lower tool holders...The finishing workman enters the program of the dead stop iron 3 facing the processing object also iejQalEleetr()niepublis) Hq input version 1§1 and debugging operation, the processing object 2 can be realized, the finishing is completed in the same order. Determination of processing technology scheme In the actual processing, the most outstanding advantages of such lathes are that they have strong bearing capacity and large cutting capacity, and can be processed at the same time. However, there are also problems such as poor quality of machined surface and difficulty in guaranteeing relative positional accuracy. . Therefore, most of the machined surfaces need to be divided into roughing and finishing. In the conventional machining method, due to the limitation of the number of tool steps (up to seven steps), the workpiece can not be finished in one-stage clamping, and usually two machine tools are used to complete the same machining surface. ,finishing. Through the comparative analysis of the machining methods of roughing and finishing of the machine tool, it is found that the number of the path, the action mode and the number of the stroke switches used by the two machining methods are exactly the same, only the position of the stroke switch which affects the depth of the tool feed (mostly one stroke) Switch position) is slightly different. In response to this situation, we made bold attempts in the transformation process and proposed a transformation plan that was completed in the order of coarse and fine machining. That is, the stroke amount of the roughing is determined by the stroke switch, and then the dead iron and the delay register are used to control the amount of machining of the finishing, so that the workpiece can be roughed and finished with only one clamping. The machining ensures the positional accuracy of the workpiece and the surface quality of the machined surface, which greatly improves the efficiency of the machine tool. There are four modes of movement: fast forward, work advance, work retreat, and fast retreat. The realization of these movements is controlled by the electromagnet (+) or de-energized (-) of the electromagnet in the hydraulic system.
When the object to be processed is given, the machining process of the object to be processed is first programmed, and the action diagram of the tool holder is drawn according to the machining process (for example). The action diagram contains the direction of motion of the tool holder, the mode of operation, the switching signal (stroke switch) and the delay. The arc tooth blank flat end programmer provides information according to the turret action sequence ft finishing process, and draws the action into the upper tool post route sequence function diagram. The function diagram describes the knife frame corresponding to each sequence action. The motion conversion signal and the output signal are used to draw the corresponding ladder diagram according to the action sequence control function diagram (for example, the cutting process is performed, because the rough finishing is completed in one process, the same stroke switch is sent to control different tool holder action sequences. In the PLC program, we use the counter counting method to discriminate this signal, thus determining the next action of the tool holder.
4 Conclusion The modified C7632 multi-tool semi-automatic lathe has the following characteristics: The semi-automatic lathe greatly improves the production efficiency. The rough finishing task, which was completed by two original lathes and two workpieces in two stages, was transformed into a lathe and can be processed in one setup.
Processing the 5t bevel disk as shown, improving efficiency by about 2 times, improving equipment reliability and reducing maintenance costs; enhancing the flexibility of the device, the use of the programmable controller realizes the programmatic and software-based control of the machine tool. Different processing can be realized by different programs for different processed objects. Different equipment can be used to revitalize the idle equipment of the enterprise and create value for the enterprise. .
(Finish)
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