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Quality control of vital parts of active bearing internal grinding machine
Source: China Bearing Network Time: 2018-06-19
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The layout of the active bearing internal cylindrical grinding machine and the active bearing outer ring groove grinding machine is similar; the 3MZ203 active bearing internal cylindrical grinding machine (hereinafter referred to as 3MZ203) is taken as an example; it has more vibration tissue than the 3MZ146 active bearing outer ring groove grinding machine (hereinafter referred to as 3MZ146). Some .3MZ146 replaced the cylindrical repairer with a repairing arc trimmer; together with the grinding frame positioning control component. Some equipment manufacturers based on the modular depiction of production thinking; also put the 3MZ135 active bearing inner ring groove grinder and the first two The table grinder is common mode; borrowing the bed, the workpiece box, the workpiece shaft, the hydraulic system, the cooling system and the cover, etc. This way; the 3MZ203's drawing level is manipulated; the drawing level of the entire production line is fundamentally controlled; and the 3MZ203 is manipulated. The key point of the depiction level is the high standard of the whole process of the depiction process, production and precision inspection of the critical parts.
In order to effectively control the depiction and production of critical parts; some domestic companies have developed corresponding internal control standards for parts processing quality. Many companies choose ABC three types of analysis; that is, in the processing of parts and components, the key points of the operation of the machine tool Management methods for key parts.
Take 3MZ203 as an example;
Class A components are: feed frame (including servo system); grinding frame (including electric spindle assembly); electrical system; wheel dresser; workpiece shafting; bed.
Class B components are: appearance organization; electromagnetic fixture; hydraulic system; bedside box.
Others such as cooling system, smooth system, cover, accessory tooling and packing box are classified as Class C.
However, it does not mean that there are no Class A parts for parts that are positioned as BC parts; it is obvious that the parts of the workpiece box and the pre-modulation assembly outside the machine should undoubtedly be classified as Class A parts.
The construction of Class A parts must have intact internal control inspection rules; the accuracy requirements of the inspection standard for Class A parts must be at least 20% tighter. The requirements for Class A parts are checked every order; the first piece of each batch must be inspected; Class A parts must pass the re-inspection when entering the installation; the initial inspection and re-inspection of Class A parts must be recorded in writing.
Outsourcing of Class A parts; external manufacturers shall supply processing technology and processing data; parts with heat treatment external processing shall be supplied to heat treatment analysis and inspection statement; data analysis shall be carried out before data is submitted through the external Class A parts. ; Class A parts require full-process control at all levels.
The inspection and control of Class B parts includes the inspection of the first precision machining process, the first inspection and the sampling inspection.
In order to improve the overall drawing level of the machine tool; the grading control of the acquisition of the machine tool purchased parts is also very important; for example, the bearing, linear guide, ball screw, servo motor and its drive control system, PLC programmable controller and active measurement Instruments, etc.; the parts related to the function of the machine tool must be classified as Class A. As long as the description is made, the brand trademark of the Class A supporting purchased parts can be specified; the first batch of customized Class A supporting purchased parts must be signed with the associated skill agreement; It is necessary to pass the strict skill assessment procedure for purchases and acquisitions; exchange the now-approved Class A brand trademarks to initiate the export of branded trademarks; in the meantime, the qualifications of the suppliers are determined. The electrical equipment is like the trip switch, Inverters, electric spindles, hydraulic parts and seals can be classified as Class B; Class B purchased parts are also required to be acquired by depicting some designated brand trademarks; they cannot be exchanged at will; some acquisitions are made for the convenience of acquisition; Class restrictions on the selection of brand trademarks; in principle, no more than 3 types; it is necessary to sign a new skill agreement to purchase or exchange new brand trademarks. File.
The quality grading of parts and components is an effective control method for the quality of internal control products of the company. The quality grading rules of parts are the hard rules of the company's quality control; the production process of the company's products can be concise and clear; No.. For the description of the bearing internal grinding machine; the quality of the parts is not only in the process of depicting the production process has its guiding significance; and in the depiction stage, the impact of product sales and cost analysis is also instructive. For example, in terms of falling product cost; Class C can give priority to economic production; greatly reduce production and acquisition costs; Class C construction standards do not need internal control. Class B can also be used as a potential to explore the production cost; The analysis of the processing cost; the B-type parts should be analyzed for the function of the related parts; it should be based on different users; the machine tool with different precision products should be properly traded. Analyze the opposite time in ensuring accuracy and reducing the cost; For Class A components, the principle of ensuring accuracy should be taken as the fundamental principle. Describe the accuracy to the one-sided arrival to reduce the cost of the cost; A class of the money can not be saved. For example; the accuracy of the machining surface of the parts associated with the accuracy of the feed tissue movement can not be reduced; work table rails, ball screws, servo The motor and its drive unit must select the product that is more stable than the precision storage; it is not possible to use the all-round combination bearing to exchange the group bearings; similar to the above restrictions; as long as the quality of the parts is categorized; the production of high-precision grinding products will be standard. Operation; artificial disturbance factors will be greatly reduced.
Before each product is drawn; before each order is signed; we must first analyze the application function of the machine tool with the user and formulate the relative equipment plan. Proof of practice; not all active equipment internal grinding machines with high equipment purchased parts are The most suitable machine tool for the user's needs. Under the premise of satisfying the user's function; ensuring that the supporting parts have the most economical equipment; they can take the lead in the market; non-critical parts do not necessarily require too luxurious equipment. Purchased parts of Class C components; in particular, components that are not frequently used in the active cycle process can be completely exchanged for domestic products of similar quality levels. In fact, more and more domestically produced active bearing internal grinding machines are exported to foreign countries; The degree of localization of the matching parts is also gradually rising. It can be safely and securely finished with high-precision active bearing internal grinding machines; the most important thing is the processing and installation quality of the parts of the A-type parts; it is the accuracy of the entire machine tool. The base of manipulation.
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