China Shenzhen Perfect Precision Product Co., Ltd. company news

On a lathe, the rotational motion of the workpiece and the linear or curvilinear motion of the tool are used to change the shape and size of the blank and machine it to meet the requirements of the drawing. Ordinary machine tools are increasingly difficult to meet the needs of processing precision parts. At the same time, the price of CNC machine tools is decreasing due to the improvement of production level. CNC precision parts machining mainly includes ultra-precision turning, mirror grinding and grinding, etc.   CNC precision parts machining is the primary premise is the accuracy of its process benchmark, the benchmark on the mechanical drawings are expressed in capital letters A, B, C, D, etc. with a specific benchmark symbol with a circle. When the benchmark symbol is aligned with the face and the face of the extension line or the face of the dimensional limits, said to be the face of the benchmark. When the datum symbol is aligned with a dimension line, it means that the centerline of the solid marked with that dimension is the datum. The process precision mentioned for you is a more general point. Assembly datum, refers to the precision used to determine the position of the part in the component or product during assembly. Measurement datum refers to the standard used to measure the size and position of the machined surface when the part is inspected. Positioning datum refers to the datum used to position the workpiece in the machine tool or fixture during machining.

Non-standard spare parts are proposed relative to standard parts. Standard parts refer to the structure, size, drawing, marking and other aspects have been completely standardized, and the common parts (parts) produced by professional factories, such as threaded parts, keys, pins, rolling bearings, etc.. Non-standard spare parts in a broad sense include standardized fasteners, links, transmission parts, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts. Narrow sense only includes standardized fasteners. Domestic standard parts commonly known as standard fasteners is short for the narrow concept, but can not exclude the existence of a broad concept. In addition there are industry standard parts, such as automotive standard parts, mold standard parts, etc., also belong to the broad sense of standard parts non-standard parts are mainly the state did not set out strict standard specifications, no relevant parameters outside the provisions, by the enterprise free control of other accessories. There are many varieties of non-standard parts, and there is no standard classification.   We mainly introduce the following metal non-standard parts. The drawings are provided by customers, and manufacturers use the equipment to make the corresponding products according to the drawings, usually molds mostly, tolerance requirements, finish are specified by customers, there is no certain paradigm. The product from casting to finishing completely requires the corresponding quality control, the process is complex and variable, and the general cost is higher than the standard parts.

Today we speak from three aspects. First: dimensional accuracy, journal is the main surface of shaft parts, which affects the rotary accuracy and working condition of the shaft. The diameter accuracy of the journal is usually IT6 to 9 according to its use requirements, and the precision journal can reach IT5.   Second: geometric shape accuracy, the geometric shape accuracy of the journal (roundness, cylindricity), generally should be limited to the diameter tolerance point range. When the geometric shape accuracy requirements are high, the allowable tolerances can be separately specified in the parts diagram. Third: the location of the processing, accuracy mainly refers to the assembly of transmission parts with the journal relative to the assembly of the bearing support journal coaxiality, is with the journal of the support journal radial circular runout to express; according to the use of requirements, the provisions of high precision shaft 0.001 ~ 0.005mm, and general accuracy shaft 0.01 ~ 0.03mm. In addition there is the coaxiality of the inner cylindrical surface and axial positioning end face And axis perpendicularity requirements.   Fourth: surface roughness, according to the parts of the surface work parts, can have different surface roughness values, such as ordinary machine tool spindle bearing journal surface roughness of Ra0.16 ~ 0.63um, with the journal surface roughness of Ra0.632.5um, with the increase in machine speed and precision degree of improvement, shaft parts surface roughness value requirements will become smaller and smaller .

On the lathe, the rotary motion of the workpiece and the linear or curved motion of the tool are used to change the shape and size of the blank and machine it to meet the requirements of the drawing. Meanwhile, the price of CNC machine tools is decreasing due to the improvement of production level. CNC precision parts machining mainly includes ultra-precision turning, mirror grinding and lapping.   The primary prerequisite for CNC precision parts machining is the accuracy of its process benchmark. The benchmarks on the mechanical drawings are represented by a specific benchmark symbol with a circle in capital letters A, B, C, D, etc. When the benchmark symbol is aligned with the face and the face of the extension line or the face of the size of the boundary, said to be the face of the benchmark. When the datum symbol is aligned with a dimension line, it means that the centerline of the solid marked with that dimension is the datum. The process precision mentioned for you is a more general point. Assembly datum, refers to the precision used to determine the position of the part in the component or product during assembly. The measurement datum refers to the standard used to measure the size and position of the machined surface when the part is inspected. Positioning datum refers to the datum used to position the workpiece in the machine tool or fixture during machining.

A batch of parts processing accuracy is poor, generally due to the installation and adjustment, the feed dynamic between the axes according to the error is not adjusted, or due to the use of wear and tear, the machine tool each axis drive chain has changed. Can be re-adjusted and modify the amount of clearance compensation to solve. When the dynamic tracking error is too large and alarm, you can check: whether the servo motor speed is too high. Position detection element is good. Whether the position feedback cable connector is in good contact. Whether the corresponding analog output latch and gain potentiometer are good. The corresponding servo drive device is normal.   Second, the machine tool movement overshoot caused by poor processing accuracy, may be acceleration and deceleration time is too short, can be appropriate to extend the speed change time. May also be a loose connection between the servo motor and the screw or rigidity is too poor, can be appropriate to reduce the position of the ring gain. Third, the roundness of the two axes linkage exceeds the difference   (1) Axial deformation of the circle   This deformation may be caused by the machinery not being adjusted properly. Poor positioning accuracy of the axis, or improper compensation of the screw gap, can lead to circularity error when over quadrant.   (2) Oblique ellipse error   In this case, the position deviation value of each axis should be checked first. If the deviation is too large, the position ring gain can be adjusted to exclude. Then check whether the interface plate of the resolver or induction synchronizer is well adjusted, and then check whether the mechanical drive vice clearance is too large and whether the clearance compensation is appropriate.

I. Production process and process.   1, the production process: from the design drawings into products, to go through a series of manufacturing processes. Usually the raw materials or semi-finished products into products after all the process called the production process.   2, the composition of the process: parts of the cutting process is a combination of many processes, each process is composed of stations, work steps, tool walking and installation. Second, the process of parts.   1, the requirements and steps for the development of process procedures   Process procedures are technical documents to guide the production, process procedures must be economical and reasonable. Parts of the process procedures is the parts of the processing methods and steps.   Content: processing technology (heat treatment process), determine the process used machine tools, clamping methods, measurement methods, machining allowances, cutting amounts and work quotas. The content will be filled in a certain form of card, which is the protocol of machining process, that is, machining process card.   2, the process analysis of the part, its main content:   (1) check whether the drawing of the part is complete and correct, analyze the main table of the part and the accuracy, table and integrity, technical requirements, etc. in the existing production conditions can be achieved.   (2) check whether the selection of the part material is appropriate, whether it will make the process difficult and complex.   (3) Review the structural processability of the part, check whether the structure of the part can be economically and effectively processed out. 3, commonly used process documents are as follows.   (1) machining process card: its main role is to briefly explain the process route of machining.   (2) machining process card: process documentation required to be as detailed and complete as possible, in addition to the process directory, but also each process process card.

The precision of the non-standard precision parts processing described here must be strictly in accordance with another plus drawings for processing, processing size in the error tolerance range are qualified parts, so the requirements of processing precision parts is strictly in accordance with the theoretical size for processing. For the processing of precision parts is mainly the size of the requirements, such as the diameter of the cylinder is how much, there are strict requirements, positive and negative error within the specified requirements to be qualified parts, otherwise are not qualified parts; length, width and height also have specific strict requirements, positive and negative error is also specified, such as an embedded cylinder, if the diameter is too large, more than the error tolerance range, it will cause the insertion of the situation, if the actual diameter is too small, more than the error tolerance range, it will not be inserted. If the actual diameter is too small, more than the lower limit of the negative error allowed, it will cause the insertion of too loose, not solid problems occur. These are substandard products, is to be scrapped or re-processed, which will certainly cause an increase in costs. Therefore, it is very important to ensure the accuracy of non-standard precision parts processing.

In terms of parts and machine adjustment to improve the accuracy of CNC lathe processing   First, first from the mechanical adjustment to study how to improve the accuracy of CNC lathe processing. In the machine tool adjustment mainly includes these parts, spindle, bed and inserts and so on, so as to make the lathe meet the requirements and improve the accuracy of CNC lathe processing, and also to monitor in real time during the work process, and to constantly optimize the shortcomings in the lathe, so as to timely adjust the production of better products. This is the most simple and convenient way to improve the accuracy of CNC lathe processing, this adjustment does not require good technology, but requires employees to check from time to time to make adjustments. Secondly, it is the improvement in electromechanical coupling, to improve the machining accuracy of the parts is mainly in the reverse deviation and positioning accuracy and repeat positioning accuracy to improve these aspects. In the reverse deviation, we should first correct the deviation too large by mechanical manual means, and then use professional methods to further optimize when the error is small to a certain extent. In the adjustment of positioning accuracy, the error is continuously optimized by the degree of microscope. In these aspects of optimization of the electromechanical coupling method, is the most efficient way of these adjustment methods. It is more tedious but more effective. Thirdly, this is through the electrical adjustment, this adjustment mainly includes two aspects, one is the adjustment of the machine parameters, in this perspective there are two aspects is to affect the processing accuracy is the system gain and positioning dead zone, in the system gain we should pay attention to the lathe by the mechanical damping aspects and the inertia of rotation, these are affecting the accuracy of the lathe processing. There is also to minimize the dead zone of positioning, which can also improve the accuracy of lathe operation. These two aspects are complementary to each other and should be adjusted at the same time. Another aspect is that the adjustment can be made through the application of some systems. As the degree of automation is increasing nowadays, the CNC lathe is automatically controlled remotely in the process of operation, so we have to enter a series of real-time monitoring procedures in the remote control, so that there is no need for excessive human intervention, which can be more effectively supervised, and the control can be supervised and set through the program. The accuracy of lathe processing can be improved.

Drones are already a household name in the emerging industry, widely used in industry, agriculture, military and other industries. For example, drones do plant protection and environmental protection were recognized by the industry several years ago; and our common drone aerial photography, using drones carrying camera devices to carry out a large number of large aerial photographs to achieve the effect of aerial overlook; and drone power inspection and detection; and post-disaster rescue and many other areas play an irreplaceable role. Then carrying a pivotal part of the drone - the drone motor shaft is a part with extremely high precision requirements   1, drone motor shaft / high-speed shaft processing accuracy, we can reach 0.005mm.   2, to ensure the surface quality of the motor shaft, optimization and bearing assembly stability, while reducing wear and tear on the seals, extending the seal life.   3、Can achieve grain refinement of the machined parts and improve fatigue strength.   4, to ensure the hardness and wear resistance of the motor shaft and reduce wear.   5、It is conducive to eliminating the stress concentration of size transition, preventing crack sprouting, preventing fatigue fracture and prolonging service life.

Shared bicycle can be a household name, in the sharing economy has been a major trend, compared to life we also feel the convenience brought by shared bicycle, then today I give you the basic knowledge of shared bicycle, gear shaft drive and chain drive. I think the chain drive we all know, is also the most common before, today I focus on introducing you to the gear shaft drive, careful observation we can find gear transmission of the sharing bicycle also more and more, such as the common Mobay has a gear transmission, so why more and more businessmen give up the traditional chain drive and choose the current gear transmission?   First of all, to popularize the gear shaft, gear shaft refers to the mechanical parts that support the rotating parts and rotate together with them to transmit motion, torque or bending moment. Generally for the metal round rod-shaped, each segment can have different diameters. The parts of the machine that make the rotary motion are mounted on the shaft.   So what are the advantages of gear shafts? First, the efficiency of the shaft drive is significantly higher than that of the chain drive. The shaft drive is generally coupled with the internal variable speed of the rear axle, and these two are added together (instead of chain + external transmission).   second, we know that shared bikes are increasingly being destroyed, especially chain-driven shared bikes, and relatively speaking, shaft-driven bikes are more durable and less prone to destruction.