What is the tolerance range of precision screws?
What is the tolerance range of precision screws?
In machine tool processing, it is often necessary to calibrate and debug the probe. The method of manually correcting the detection is inefficient and the accuracy is unstable. In addition, accidents such as collisions will occur. However, calibration tools such as ring gauges are expensive, have large working strokes and poor versatility. Technical realization elements: In view of the above content, it is necessary to provide a positioning pin for probe calibration to solve the above problems. A positioning pin is used for calibrating a probe, the positioning pin includes a connected cylinder and a cylinder, the cylinder is used to be installed on a jig in a machine tool, and the end of the cylinder away from the cylinder is provided with a measuring hole to calibrate the probe. Further, the positioning pin is also provided with a chip removal hole, one end of the chip removal hole is connected to the measuring hole, the other end of the chip removal hole penetrates the end of the cylinder away from the cylinder, and the chip removal hole is used for discharging machining chips and cutting fluid. Further, the diameter of the chip removal hole is smaller than the diameter of the measuring hole. Further, the positioning pin further includes a positioning piece, the positioning piece includes a base and a magnetic piece, one end of the base is provided with a mounting hole for installing the magnetic piece, and the other end of the base is provided with a limiting hole for mounting the column. Further, the limiting hole communicates with the mounting hole. Further, the limiting hole is a blind hole. Further, the diameter of the cylinder is larger than the diameter of the cylinder. Further, the measuring hole is a cylindrical hole. Further, the diameter of the cylindrical hole is 4 mm. Further, the end face of one end of the cylinder provided with the measuring hole is a curved surface, and the end faces the peripheral wall of the cylinder to bend and transition to connect the peripheral wall. The positioning pin of Guangdong Yueluo Hardware Industry Co., Ltd. uses the measuring hole to carry out the probe. It is easy to operate, simple in structure and highly versatile. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a positioning pin of an embodiment of Guangdong Yueluo Hardware Industry Co., Ltd. FIG. 2 is a three-dimensional schematic view of the positioning pin shown in FIG. 1 without a positioning member. FIG. 3 is an exploded schematic view of the positioning pin shown in FIG. 1 . FIG. 4 is a cross-sectional view of the positioning pin shown in FIG. 1 along the line IV-IV. Description of main components and symbols Locating pin 100 Cylinder 10 Measuring hole 11 Chip removal hole 12 Cylinder 20 Positioning piece 30 Base 32 Mounting hole 321 Limiting hole 323 Magnetic piece 34 The following specific embodiments will be further described in conjunction with the above drawings Guangdong Yueluo Hardware Industrial Co., Ltd. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical solutions in the embodiments of Guangdong Yueluo Hardware Industry Co., Ltd. will be clearly and completely described below with reference to the accompanying drawings in the embodiments of Guangdong Yueluo Hardware Industry Co., Ltd. Obviously, the described embodiments are only Some examples of Guangdong Yueluo Hardware Industry Co., Ltd. are not all examples. Based on the embodiments in Guangdong Yueluo Hardware Industry Co., Ltd., all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of Guangdong Yueluo Hardware Industry Co., Ltd. It should be noted that when an element is referred to as being connected to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being disposed on another element, it can be directly disposed on the other element or intervening elements may also be present. Unless otherwise defined, all technical and scientific terms used herein are related to those of Guangdong Yueluo Hardware Industry Co., Ltd.
In industrial production, some products need to remove the fixing screws; or in the assembly line, the screws that fix the product on the fixture also need to be removed when the product is unloaded. At present, the dismantling of the screws is mainly completed by the manual operation of the operator. However, this method of manually dismantling the screws has low work efficiency and high production cost.
As my digital TV technology becomes more and more mature, more and more people with digital-to-analog signal conversion function enter people's lives. Therefore, the number of production and processing is also increasing day by day. There are many requirements for the form, reliability and cost of PCB fixing screws in production. One of the existing fixing methods is to fix by means of bolts and nuts. The operation steps are to place the PCB board on the inner threaded copper column connected to the casing, and pass through the bolts with fine teeth. Screw holes on the PCB board, and then fix them on the copper posts with nuts. The connection method of this solution is reliable, but its manufacturing cost is high, and the copper column and the metal shell need to be screwed together, resulting in low production efficiency and high cost. In addition, there is also a common way that the PCB is supported by a plastic column, and the self-tapping screw is passed through the screw hole on the PCB board, and the PCB board and the metal bottom shell are connected by the self-tapping thread on the screw. The main disadvantage of this solution is that after the screw is fixed on the metal shell, the screw head is exposed at the bottom of the machine. If the user is not careful during use, the hand scratching phenomenon will occur, which will bring changes and harm to the user's use. . And when the machine slides on the desktop, if the screw head is too exposed, it will scratch the desktop. Therefore, how to provide a PCB fixing method with convenient operation, reliable connection and low production cost is a technical problem to be solved urgently in the industry.
The shaft and gear of financial self-service equipment are often connected by elastic straight groove cylindrical pins. When repairing, the traditional disassembly method is to use the shaft and gear as components. After disassembling together, align the punch with the elastic pin by hand, and use a hammer to remove the elastic pin. Pin out. With this disassembly method, the human hand is easily injured, and the disassembly efficiency is low.
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