The machining center does not grasp the knife

The machining center does not grasp the knife

Vertical machining center: it is called computer gong in Hong Kong, Taiwan and Guangdong. It is a highly automatic multi-functional CNC machine tool with tool magazine and automatic tool changing device. The first machining center appeared in the United States in 1958. It can realize the centralized processing of milling, drilling, boring, reaming, tapping and other processes after the workpiece is clamped at one time, with special emphasis on “milling”.

Engraving machine: its spindle speed is high, suitable for small cutting tools processing, torque is relatively small, focusing on the “carving” function, such as wood (wood carving machine for special processing of wood), dual color board, acrylic plate and other plates with low hardness, which are not suitable for large workpieces with strong cutting. At present, most of the products on the market with the banner of engraving machine are mainly for processing handicrafts with low cost. Due to the low precision, they are not suitable for mold development. However, there are also exceptions, such as wafer engraving machine.

Engraving and milling machine: it can be carved or milled. On the basis of engraving machine, the power of spindle and servo motor is increased, and the bearing force of lathe bed is maintained. At the same time, the high speed of spindle is maintained. More importantly, the precision is very high. Engraving and milling machine also to high-speed development, commonly known as high-speed machine, cutting ability is stronger, processing accuracy is very high, but also can directly process hardness above HRC60 materials, one-time molding. Vertical machining center refers to the machining center with the spindle axis perpendicular to the worktable. It is mainly used to process complex parts such as plates, plates, molds and small shells. Vertical machining center can complete milling, boring, drilling, tapping and thread cutting. Vertical machining center is at least three axis and two linkage, generally can achieve three axis and three linkage. Some can be controlled by five or six axes.

The disadvantage of vertical machining center is to reduce the height of vertical machining center. However, the vertical machining center is convenient for workpiece clamping and positioning; the movement track of the cutting tool is easy to observe, the debugging program is convenient to check and measure, problems can be found in time, and the machine can be stopped or modified; the cooling conditions are easy to establish, and the cutting fluid can directly reach the cutting tool and the machining surface; the three coordinate axes are consistent with the Cartesian coordinate system, which makes it intuitive and consistent with the drawing perspective, and the chip is easy to be removed and dropped, Avoid scratching the machined surface. Compared with the corresponding horizontal machining center, the structure is simple, the floor area is small and the price is low.

Vertical machining center is a highly automatic multi-functional CNC machine tool with tool magazine and automatic tool changing device, which is based on CNC control unit. It communicates with the servo system to control the operation of servo motors of several shafts, so as to achieve the cutting movement of each axis. The machine tool is composed of bed, slide plate, worktable, column, electrical cabinet, tool magazine, oil mist lubrication unit of spindle, chip conveyor, etc.

There are two kinds of tool changing methods in vertical machining center: manipulator tool changing mode and direct tool changing mode. Many reasons can cause the tool magazine can not grasp or change the tool correctly, summed up as follows 7 points.

  1. Caused by electromagnetic valve or magnetic induction switch of tool magazine

Vmc750 vertical machining center adopts direct tool changing mode, and the action of tool magazine includes swing and rotation. A three position five way solenoid valve is used to control the cylinder to drive the magazine to swing, and a single-phase magazine motor is used to realize the rotation of the magazine. There is a progressive switch in the magazine for counting. When changing the tool, the tool magazine should first be placed at the spindle position, and the original tool should be put back into the tool sleeve, and then the tool magazine should be rotated to find the next tool and grasp it again. The position and position of the main shaft of the tool magazine are judged by two magnetic switches on the cylinder of the tool magazine. When the solenoid valve and magnetic switch fail and alarm [39-12], the tool magazine is not set to the spindle position within the specified time; when [39-15], the tool magazine is not put to the original position within the specified time. At this time, it is necessary to check whether the solenoid valve acts. If the swing tool magazine can not hear the action sound of the solenoid valve, it is necessary to manually check the quality of the valve (at this time, it is better to disconnect the output end of the valve), and if it is broken, replace it.

  1. Three switch values in the headstock are incorrect

Whether the spindle state is correct or not is judged by the three progressive switches in the spindle box (sq7 clamping switch, SQ8 release switch, sq9 knife free switch). The three switches are distributed in a triangle and sense the different parts of the loose broach cylinder. The correct position switch value should be as follows: (1) normal no knife: sq9 and sq7 lights are on; (2) normal knife is on: only sq7 light is on; (3) press release button: only SQ8 light is on. Generally, the three switches are not in correct state. The alarm code is [39-4]: pull rod failure; [39-13]: pull rod loosening fault; [39-14]: pull rod clamping fault; [39-34]: the tool is not clamped. These alarms are related to the three progressive switches. It is necessary to check whether the switch is good or not, and adjust it to the appropriate position to make the switch value indication correct.

  1. Caused by damage of photohazard board

If the valve is correct, check the status of I / O switch value: whether the signal of spindle position slidrum spdl000:00 / 15 or original position slidrum park000:00 / 16 has been given. Check whether the corresponding 24 V level signal on the optical hazard board, the fuse on the board and the 110V voltage of the signal coming from the optical hazard board are sent to the solenoid valve. The fault point can be found out by checking the signal voltage all the way. Vertical CNC machine tools are usually more likely to damage the safety tube and optical tube. It is good to buy the same glass fuse or optical tube to replace it.

  1. Mechanical jamming

If the handle is stuck, press the release button to hear the cylinder pressing down, but the knife will not come off. This is due to the fact that the handle is rusty due to no attention to maintenance

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