What is the tolerance range of precision screws?
What is the tolerance range of precision screws?
Guangdong Yueluo Hardware Industry Co., Ltd. is a screwing fixture, including a bottom plate, a bearing seat and a hydraulic press are respectively installed on both sides of the top of the bottom plate, a bearing is installed inside the bearing seat, and the inner ring of the bearing is connected to the support The bottom end of the vertical rod is snap-connected, the top end of the supporting vertical rod is fixedly connected to the supporting horizontal rod through an adjusting screw, the bottom end of the supporting horizontal rod is provided with a chute, and the inside of the chute is connected by sliding The slider is fixedly connected with the electric batch, the hydraulic press is connected with the fixed seat through the hydraulic rod, the top of the fixed seat is fixedly connected with the screw positioning plate through two fixed blocks, and the opposite side of the two fixed blocks is provided with Clamping mechanism for clamping workpieces.
The embossing wheel is used to press the mesh pattern (rolling mesh pattern), and the middle is slotted. After milling, the thread still guarantees 6H accuracy. This knurled copper nut is used in power tools, which is different from other knurled copper nuts. The diamond pattern of this knurled copper nut is located in the middle section of the product, and the diamond-shaped mesh knurling wheel rolls the diamond-shaped flower along the large outer circular step surface.
According to the force of the connection, it is divided into ordinary and hinged holes. According to the shape of the head: there are hexagonal head, round head, square head, countersunk head and so on. Among them, the hexagonal head is the most commonly used. Generally, countersunk heads are used where connections are required. The English name of the riding bolt is U-bolt. It is a non-standard part. The shape is U-shaped, so it is also called a U-bolt. There are threads on both ends that can be combined with nuts. It is mainly used to fix tubular objects such as water pipes or sheets such as automobile plates. Springs are called riding bolts because of the way they fix things like a person rides a horse. According to the length of the thread, it is divided into two categories: full thread and non-full thread. According to the thread type, it is divided into two types: coarse thread and fine thread. The coarse thread type is not displayed in the bolt mark. The bolts are divided into eight grades: 3.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, and 12.9 according to their performance grades. Among them, the bolts above grade 8.8 (including grade 8.8) are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched). + Tempering), commonly known as high-strength bolts, and below grade 8.8 (excluding 8.8) are commonly known as ordinary bolts. Ordinary bolts can be divided into three grades: A, B, and C according to the production accuracy. Grades A and B are refined bolts, and grade C is rough bolts. For connecting bolts for steel structures, unless otherwise specified, they are generally ordinary rough grade C bolts. There are differences in the processing methods of different grades. Usually the corresponding processing methods are as follows: ① The bolts of grade A and B bolts are processed by lathes, with smooth surfaces and accurate dimensions. High, rarely used; ②C-grade bolts are made of unmachined round steel, the size is not accurate enough, and its material property grade is 4.6 or 4.8. The deformation is large during shear connection, but the installation is convenient and the production cost is low. It is mostly used for tensile connection or temporary fixation during installation.
The retaining ring is divided into two types: shaft use and hole use. Its structural characteristics: The shaft retaining ring is a kind of retaining ring installed on the shaft groove, which is used for positioning and fixing of shaft end parts, and can withstand severe vibration and shock loads, but It is necessary to take anti-loosening measures and installation positioning; the hole is installed in the circular hole with an elastic retaining ring, which is used for the axial movement of the fixed parts. The outer diameter of this retaining ring is slightly larger than the diameter of the assembly circular hole.
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