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

Although the precision parts processing factory has a strict quality control system in the production process, there will also be quality personnel for product testing before shipment, due to the large number of products, many processes, coupled with problems in the transportation process, the product will also have a defective product. In the face of customer complaints about defective products, how should we deal with them? 1、Tracing the source of the problem and proposing solutions   First of all, product quality problems, must stand to have the customer first perspective, as soon as possible to provide solutions, and assume the relevant responsibility. According to the situation of product quality problems, targeted treatment, in this process, precision parts processing manufacturers to have a sense of responsibility, encounter problems to solve the problem, rather than shirking responsibility. Identify the reasons for the quality problems, feedback to the production line to avoid the recurrence of similar mistakes, so that the quality of the enterprise's precision CNC machining products become better.   2、Product rework   If the product quality problems are relatively light, such as precision parts larger than the size of the tolerance, surface wear, on some issues can be recalled to the product, back to the factory line rework processing can be qualified to leave the factory. During this period, the transportation costs, product processing costs are borne by the manufacturer. 3、Product scrapping   If the high precision five-axis parts processing serious quality problems, such as parts bit micro deviation, material selection errors, etc., must be scrapped products, not for secondary processing. CNC processing manufacturers must re-produce new products, and bear all the costs incurred in the process, if the delay in the use of customer installation, must bear the corresponding compensation.

Shenzhen cnc machining center carried out so far, the total output value gradually increased, the domestic machine tool industry is also becoming more and more prosperous. The appearance design of most machining centers on the market, slicing conveyor can be adjusted to the back of the production line, suitable for customizing the arrangement of the production line, is also one of the reasons why customers love it. The machine uses high-torque motor, the output of the motor can fully reflect the spindle characteristics, indexing disc high efficiency, high precision, including 8 oil joints, a pneumatic confirmation of tight, high activity, can deploy oil pressure jig use.   Large CNC machining center spindle for vertical machining center, the structure of the form of fixed column, the table is rectangular, no indexing rotary function, suitable for processing disc, set, plate parts, with three linear motion coordinate axis, and it can be installed on the table a rotary turntable along the horizontal axis, the processing of spiral parts. The machine is replaced by pneumatic method, which is convenient and handy. The machine uses automatic lubrication to ensure the outstanding operation of all parts of the machine. The structure of the machine is in the form of a horizontal trailing plate, with a reasonable layout. The three axes of feed use precision ball screw and servo motor connection drive, improve the transmission accuracy. Machine X and Y-axis guide selection of precision tumbling linear guide, high feed sensitivity; Z-axis using rectangular hardened cast iron - plastic sliding guide vice, with outstanding oscillation absorption; machine control system selection of AC servo system, suitable for the processing of messy parts, especially the processing of messy mold.   Machine spindle with servo spindle motor, spindle box with counterweight equipment, to ensure the smooth operation of the Z axis. As we all know, shenzhen cnc machining center spindle speed is generally high, but as the spindle speed continues to increase, especially to reach fast, all kinds of random oscillations, followed by an increase in the instability of the rotary axis, when beyond the fatigue strength of the spindle eventually lead to a reversible increase in spindle rotation error, and ultimately affect the machining accuracy of the machine tool. So the selection of spindle speed is very important.

1.Precision parts processing requirements for process personnel: an experienced process personnel can develop scientific, precise, efficient process flow, process flow is the guiding norms of Foshan precision parts processing, but also the basis for CNC programming. Process is not good, the whole factory is busy!   2. Requirements for equipment precision: the precision of the selected processing equipment itself, should meet the precision requirements of precision parts processing, processing equipment precision if not up to, there will be no way to process the precision parts to meet the requirements. 3. Requirements for the operator: the operator is directly engaged in the field operation of technical engineering personnel, the need to strictly implement the process, should have the most basic operation of equipment tools, experience, hands-on ability. Can actually solve problems.   4. Requirements for gauge testing: the good or bad of the measuring equipment, directly affects the test results of precision parts. If the measurement equipment, there is no way to detect the required tolerance accuracy. Then it does not have, the evaluation of precision parts, more can not provide engineers with quality improvement direction and data.   5. The requirements of the material: material on the precision parts processing put forward very obvious differences in the requirements of different materials processing performance is different. Requirements for processing parameters also have different. We need to select the appropriate tool, revolution, feed, and various processing parameters according to the processing performance of the material. 6. Requirements for tolerance accuracy: the level of tolerance accuracy directly affects the machining process and the selection of processing equipment and processing parameters. This requires our process engineers and operators to have a quantitative precision grasp of tolerance accuracy. Only then can we process the precision parts that meet the requirements.   7. requirements of the environment: processing environment refers to, machine and equipment workshop environment, to meet the requirements of precision parts processing. At times, the floor vibration and noise or air cleanliness, too much dust. Temperature, humidity will affect the precision and stability of precision parts processing.

Basin friends who have touched the ultra-precision machining center should understand that it is very easy to produce oil leaks during the whole process of large cnc machining. In fact, it is very easy to see the part of CNC machining management center oil leakage. Mainly because of spare parts or machining center cylinder oil leakage caused by. If it is spare parts, maintenance is relatively simple. If it is the cylinder, it is very inconvenient and may cause equipment damage. Oil changes that do not meet the regulations usually also cause CNC machining oil leaks. Oil change in the occurrence of the problem is specifically expressed in three levels.   First, for low-viscosity grease parts, oil change casually replaced with high-viscosity grease, it will make the corresponding shell, hole shaft and other sealing characteristics suffer certain hazards, there is also a high probability of significantly reducing the tightness of such parts.   Second, precision CNC lathe machining parts do not clean the car oil tank when changing oil, the waste in the car oil tank will have a high probability of entering the lubrication system, blocking the oil channel and damaging the hydraulic seals leading to oil leakage.   Third, CNC machining oil change when the oil is too much, especially in the parts with rotating parts, because of the stirring effect of rotating parts, more very easy to occur oil leakage conditions. The adoption and adjustment of the lubrication system parts unreasonable and cause CNC machining oil leakage, such as CNC machining maintenance personnel overhauled using a gasoline pump with too high working pressure or too much oil, or adjust the system software working pressure, speed control valve, valve, regulator and other working pressure adjustment is too high, the total flow of CNC lathe lubrication system is too large, etc. and pumping oil system software and its sealing system software does not match In fact, it will lead to oil leakage.   In fact, the cause of oil leakage in CNC machining is not only the above aspects, if we encounter similar problems in the process of operating the lathe CNC machining must be carefully checked, immediately find out the cause of oil leakage in CNC machining to prevent excess damage.

Right-angle grooves in precision parts machining consist of three planes with a cross-sectional shape of three straight lines, with adjacent lines perpendicular to each other. Right-angle grooves are usually divided into three forms: closed, semi-closed and open right-angle grooves. Right-angle grooves can be distributed on flat and cylindrical surfaces. The more classical right-angle grooves are keyways, which are divided into ordinary flat keyways and semi-circular keyways. The characteristics of the milling process for right-angle grooves are as follows. 1. Using fixed diameter or fixed width milling cutters (such as keyway milling cutters, semicircular keyway milling cutters, disc-shaped slot milling cutters, etc.) to control the width of the slot size with high accuracy, such as keyway on the shaft with flat keys and semicircular keys, open right-angle grooves with matching accuracy requirements, etc.   2. The symmetrical position of the keyway on the shaft in the precision parts machining is usually different according to the accuracy level, respectively, using different tool setting methods. The keyway with high symmetry requirements uses the indicator table ring table method to find the relative position of the workpiece axis and tool axis or the middle section of the disc milling cutter, and the keyway with low symmetry requirements can be processed by the cut mark-to-to-tool method.   3. The machining of keyway on the shaft is usually done by V-block positioning or self-aligning chucking with indexing head to ensure the symmetry of the workpiece and other major machining accuracy requirements.

A. Tool position point cnc four-axis machining tool position point is a reference point on the tool, the tool position point relative movement of the track that is the processing route, also known as the programming track.   Second, the tooling and tooling point Tool setting is to make the tool position point coincide with the tool setting point by certain measurement means before starting the CNC program by the index control operator. You can use the tool setting instrument to the tool, its operation is relatively simple, the measurement data is also more accurate. You can also position the fixture and install the parts on the CNC machine tool after the use of measuring blocks, stoppers, micrometers, etc., using the coordinates on the CNC machine tool to the tool. On the operator, determine the point of tooling will be very important, will directly affect the accuracy of the machining of parts and program control. In the batch production process, it is more important to consider the repetition accuracy of the tool setting point, it is necessary for the operator to deepen the understanding of CNC equipment and master more tool setting skills. (1) the selection guidelines of the tool setting point   In the machine tool is easy to find the right, easy to view in the processing, easy to calculate when programming, and the tooling error is small. Tool setting point can pick a point on the part (such as the center of the positioning hole of the part), can also pick a point outside the part (such as a point on the fixture or machine tool), but must have a certain coordinate connection with the positioning reference of the part. Improve the accuracy and precision of tool setting, even if the part does not require high precision or the program requirements are not strict, the machining accuracy of the selected tool setting part should be higher than the machining accuracy of other orientations. Select the part with large contact surface, easy to monitor, and stable machining process as the tool setting point. Tooling point as far as possible and the design reference or process reference unified, to avoid the size of the conversion leads to tooling accuracy or even processing accuracy reduced, increasing the difficulty of CNC programs or parts CNC machining. In order to improve the machining accuracy of the part, the tooling point should be selected as far as possible in the design of the part benchmark or process benchmark. For example, the hole positioning parts, the center of the hole as the tooling point is more appropriate. The accuracy of the tooling point depends on both the accuracy of the CNC equipment, but also depends on the requirements of the parts processing, manual check the accuracy of the tooling to improve the quality of CNC machining of parts. Especially in the batch production to take into account the repetition accuracy of the tooling point, the accuracy of the tooling point can be used relative to the machine tool origin of the coordinate value to check. (2) the selection method of the tooling point On the CNC lathe or turning and milling machining center CNC equipment, due to the center of the orientation (X0, Y0, A0) has been determined by CNC equipment, determine the axial orientation can determine the entire processing coordinate system. Therefore, only need to determine the axial (Z0 or relative orientation) of a certain end face as a tool setting point can be.

Precision parts processing enterprises how to give product positioning, this issue, enterprises must pay great attention to. Each enterprise has its own goods, and each commodity has its own category, and positioning is to find this has the core competing ability goods, so as to enter this market, to obtain more customer orders. We are in an era of overproduction, CNC machining manufacturers are everywhere, the market economy is highly developed to provide customers with too many choices of precision parts processing. How to let customers choose their own, is the headache of every enterprise. The simple and brutal approach is to use the price to impress customers. So the more intense competition in the industry, the more inevitable the price war. You know, stable prices, will bring sustained profits, price war itself is unsustainable, with the price to attract customers will sooner or later leave you because of the price.   In addition to what you can sell cheaper than the competition, we have no other way, can make customers take the initiative to choose, and give you the right price? Of course there is, and that is differentiation. And positioning serves precisely to differentiate. Through positioning to find the weak point in the market, and the intersection of our own strengths, and then quickly cut into the new market, to establish their own corporate influence.   We often say to solve the customer's pain points, the reason why customers still have pain points, is because the existing product processing in this market can not fully meet their needs, especially in certain subdivision scenarios, subdivision of the field of demand. Such as precision parts processing of certain industries, aviation, cell phones, intelligent equipment industry, the need for more sophisticated equipment and testing equipment, not all CNC machining manufacturers can complete, we can complete the difficult, high-precision product manufacturing. These are from the point of view of the product, trying to find a business and competitors can play a differentiated positioning. Precision parts processing enterprises should always pay attention to the changes in the market, when the market changes have accumulated to a qualitative change, like the arrival of the Internet, that is, you should go to rethink the needs of buyers, re-adjust the positioning of the time. The success of the enterprise can not be separated from good positioning, of course, can not be separated from our own good competitive products.   Positioning theory should stand in the overall height and competition perspective, to see the development of an enterprise, is a strategic thinking for the market. Its role does not replace the product itself as the status of enterprise ballast. A correct view of positioning, flexible use of positioning, open new markets, we can get greater returns.

When turning slender shafts in the field of precision parts machining, the rigidity of the workpiece itself is poor, and if the center stand, the follow tool holder and other auxiliary tools are not properly adjusted, the geometry and surface quality will not meet the requirements, thus leading to bending. The workpiece has a large diameter and poor rigidity; the radial cutting force and centrifugal force during turning, the workpiece produces thermal deformation elongation and cutting stress; the blank material itself is a deformed rod and other reasons, which can cause the workpiece to bend.   The solution is to use the center frame, follow the tool holder, increase the rigidity of the workpiece; reasonable selection of the geometric angle of the tool (mainly large front angle, large main deviation angle), reduce the radial cutting force, reduce the generation of cutting heat; the use of spring top, reduce the adverse effects of the workpiece line expansion, fully pour cutting fluid, reduce friction and quickly take away the heat generated, the necessary heat treatment of the blank or workpiece. In the process of precision parts processing if the blank material itself or processing bending, should be timely straightening before continuing turning. Specifically according to the need to choose hot forging straightening, cold pressing correction, counterstrike method correction, counterstrike method straightening, pry hit straightening, simple tool straightening, quenching straightening, anti-torsional groove straightening and other appropriate methods.

In the process of work, the problem of failure is very normal, so we should not be too surprised when we meet the failure, want to avoid more failures, then we have to do a good job of maintenance outside the work, many new users do not know what to do when they encounter failures, want to solve the problem, we must first find the source of the problem, the following together to understand the causes of large cnc machining is what? 1, may be the reason of the tool, sometimes it is not our operation what is wrong, but the problem of the accessories, because the tool is not sharp enough, not strong enough and so on these reasons will lead to the broken knife. 2、It is also because of the material problem, when the aluminum alloy shell is not uniform enough, uneven hardness and softness, or too many impurities will also lead to the occurrence of the problem. 3、The problem of clamping, we have to see whether the aluminum alloy shell is firmly clamped; whether the fixture is locked. These reasons are worth our attention. 4, there is the machine tool problem. CNC machining machine tool is level; voltage is stable; machine screw is aging and other such reasons   5, the preparation of the program, the preparation of aluminum alloy shell processing program, the spindle motor speed is too low; eating tool amount is too large; machining allowance is reasonable; aluminum chip discharge is smooth.

The common right-angle grooves in precision parts machining are open, closed and semi-closed, of which the tail of the semi-closed groove has two forms: vertical milling cutter arc (vertical arc) and disc-type milling cutter arc (lying arc). The keyway on the shaft is a typical right-angle groove with a flat key coupling the shaft and the sleeve, and the special-shaped grooves milled on the milling machine are V-groove, T-groove, semi-circular keyway and dovetail groove, etc. Machine tool guides, shaft parts are often positioned using V-grooves: T-grooves are mainly used to put on T-bolts, such as T-grooves on the machine table for putting on bolts to clamp the workpiece: dovetail fits are usually also used for machine tool guides, such as longitudinal and vertical guides for milling machines. Right-angle groove and special-shaped groove milling technology requirements (1) dimensional accuracy: the width, length and depth of the groove have certain dimensional accuracy requirements, especially for the parts that fit with other parts, the dimensional accuracy requirements are relatively high. Such as both sides of the keyway, because with the flat key, its width size tolerance is less than or equal to 0.052mm. (2) shape accuracy: various shapes of grooves after milling precision parts processing, should meet the shape accuracy requirements of the drawings. Right-angle groove and special-shaped groove are composed of plane, therefore, usually have the basic requirements of flatness and straightness. Used to fit the plane, its shape requirements are higher, such as the key slot on both sides of the surface, T-slot benchmark straight groove on both sides of the surface, V-slot V-shaped surface, dovetail groove with the bevel and horizontal surface. (3) positional accuracy: precision parts processing between the slot and the reference generally have positional accuracy requirements, such as the shaft key slot generally has a slot width size on the workpiece axis symmetry requirements, such as the T-slot middle plane and the reference side parallelism requirements, several T-slots between the parallelism requirements, in addition, the distribution of grooves on the shaft parts, there is equal precision or angle requirements. (4) surface roughness: the surface roughness requirements for each surface of the composition of the groove, the surface used to fit requires a small surface roughness value, such as the benchtop T-slot benchmark straight groove on both sides of the surface is often used for fixture positioning, therefore requires a small surface roughness value.