The processing methods of the tooth mold electrode mainly include: gear machining, milling machine machining and machining center CNC machining. Among these three processing methods, the gear cutting machine has the lowest machining precision, and the electrodes processed by the new factory can reach ISO7-8, the milling machine has better machining precision, and the processed electrode can reach ISO 6-7. The highest precision is the electrode machined by the machining center. The precision machining center can process the electrode to ISO 4~6. At present, all major gear precision forging manufacturers and some universities in China are developing machining center processing technologies for planetary gears and semi-axle gear electrodes. For example, Jiangsu Pacific Precision Forging Co., Ltd. and Qingdao Samsung Precision Forging Gear Co., Ltd. have made breakthroughs. FAW Technology As early as 2002, the pressure chamber of the central technology department developed the machining technology of the planetary gear and the half shaft gear tooth mold electrode (see Figure 1, Figure 2) and the machining center of the standard gear, and controlled the precision of the electrode and the standard gear. In ISO 4 to 5 levels. In recent years, breakthroughs have been made in the control of tooth engagement and contact zone, so that the deformation of the tooth profile during the forming process and after forging, and the subsequent heat treatment can be completely corrected by the adjustment of the model.
The EDM equipment and process specifications of the tooth profile cavity directly affect the surface quality of the cavity and the accuracy of the die profile. Hot forging die steel and high speed steel generally use 2 to 3 electrodes. The hard alloy tooth profile requires 4 to 5 electrodes to achieve higher precision of the tooth profile, and the electrode material also uses copper tungsten alloy.
In order to ensure high production efficiency and quality of the mold processing, the mold electrode needs to maintain the same positioning standard in the machining process and the EDM process of the machining center. At present, many companies and research institutes have adopted Swedish 3R fixtures or Swiss EROWA fixtures. The electrode is roughed before NC machining, the reference piece is fixed on the electrode blank, and then clamped on the reference seat of the machining center. The reference piece is moved to the reference seat of the EDM machine together with the electrode after the NC machining, ensuring The consistency of the benchmark.
In the process of electric spark forming tooth mold, the roughing electrode and the semi-finishing electrode should be well matched, and the size between the fine electrode should be properly matched, otherwise the production efficiency will be low, and the tooth surface quality of the mold is poor, sometimes due to the electrode. The excessive loss even affects the accuracy of the tooth shape, which ultimately affects the quality of the gear parts.
4. Subsequent machining of planetary gears and half shaft gears
(1) Machining of inner bore and spherical surface of planetary gears Precision forged planetary gears require drilling and spherical roughing and large-end chamfering, and grinding the inner and spherical surfaces after carburizing and quenching. Roughing and finishing should be based on the position of the toothed taper. Currently supported by three-ball spherical support, it is also supported by involute or linear toothed supports. The roughing is mainly supported by linear toothed supports, which can improve the supporting force. Finished spherical supports and toothed supports are also used.
(2) Subsequent processing of semi-axle gears Precision-forged half-shaft gears require drilling, roughing of inner bores, outer rounds, end faces and chamfers; finishing inner bores, outer circles, end faces; pull inner splines; carburizing and quenching; Grind the outer circle and the end face. The key positioning reference is the toothed cone. Positioning is similar to planetary gears.
5. Major quality problems that are prone to occur during the operation of planetary gears and half shaft gears
At present, the main quality problems that occur during the operation of planetary gears and half-shaft gears are planetary gears and half-shaft gears. The main reasons for the analysis from the gear angle are: the contact area of ​​the planetary gear and the semi-axle gear is small, the installation distance is excessively poor, the root cone angle is small, the big end chamfer is too large, and the size of the back cone is small. The contact area between the planetary gear and the half shaft gear is biased toward the top of the tooth, which makes the bending moment of the single tooth of the gear larger, which is directly related to the theoretical shape of the tooth profile of the planetary gear and the half shaft gear, the backlash and the coincidence degree during the meshing process. The installation gear is out of fluctuation and causes the individual teeth of the gear to bear a large load, which has a great relationship with the error of the circumferential section after the gear machining. In addition, the small taper angle causes the single tooth strength to be weakened; the large end chamfer is too large and the back cone size is small, which reduces the contact area of ​​the gear to a different extent. In addition to the influence of the shape and machining accuracy of the gear itself, the machining quality and assembly quality of the cross shaft, the differential case, the gasket and the like also have a negligible influence.
Analysis of the problem of toothing requires a comprehensive consideration of various factors and the identification of key causes to completely solve the problem. High-quality gears have strict requirements on accuracy and require strict control of the gear production process.
6. Conclusion
In recent years, planetary gears, semi-axle gears, precision forging and mold manufacturing technology have developed rapidly, from material control, heating to precision forging, to mold processing, and subsequent heat treatment and machining. progress. Future precision forged planetary gears and half shaft gears will develop toward higher precision, strength and less meshing noise.
1. Great multi-purpose belt, ideal for
cleaning, finishing, blending and deburring
Multi-Purpose Belt Great for Tackling
Multiple Applications
The EDM equipment and process specifications of the tooth profile cavity directly affect the surface quality of the cavity and the accuracy of the die profile. Hot forging die steel and high speed steel generally use 2 to 3 electrodes. The hard alloy tooth profile requires 4 to 5 electrodes to achieve higher precision of the tooth profile, and the electrode material also uses copper tungsten alloy.
In order to ensure high production efficiency and quality of the mold processing, the mold electrode needs to maintain the same positioning standard in the machining process and the EDM process of the machining center. At present, many companies and research institutes have adopted Swedish 3R fixtures or Swiss EROWA fixtures. The electrode is roughed before NC machining, the reference piece is fixed on the electrode blank, and then clamped on the reference seat of the machining center. The reference piece is moved to the reference seat of the EDM machine together with the electrode after the NC machining, ensuring The consistency of the benchmark.
In the process of electric spark forming tooth mold, the roughing electrode and the semi-finishing electrode should be well matched, and the size between the fine electrode should be properly matched, otherwise the production efficiency will be low, and the tooth surface quality of the mold is poor, sometimes due to the electrode. The excessive loss even affects the accuracy of the tooth shape, which ultimately affects the quality of the gear parts.
4. Subsequent machining of planetary gears and half shaft gears
(1) Machining of inner bore and spherical surface of planetary gears Precision forged planetary gears require drilling and spherical roughing and large-end chamfering, and grinding the inner and spherical surfaces after carburizing and quenching. Roughing and finishing should be based on the position of the toothed taper. Currently supported by three-ball spherical support, it is also supported by involute or linear toothed supports. The roughing is mainly supported by linear toothed supports, which can improve the supporting force. Finished spherical supports and toothed supports are also used.
(2) Subsequent processing of semi-axle gears Precision-forged half-shaft gears require drilling, roughing of inner bores, outer rounds, end faces and chamfers; finishing inner bores, outer circles, end faces; pull inner splines; carburizing and quenching; Grind the outer circle and the end face. The key positioning reference is the toothed cone. Positioning is similar to planetary gears.
5. Major quality problems that are prone to occur during the operation of planetary gears and half shaft gears
At present, the main quality problems that occur during the operation of planetary gears and half-shaft gears are planetary gears and half-shaft gears. The main reasons for the analysis from the gear angle are: the contact area of ​​the planetary gear and the semi-axle gear is small, the installation distance is excessively poor, the root cone angle is small, the big end chamfer is too large, and the size of the back cone is small. The contact area between the planetary gear and the half shaft gear is biased toward the top of the tooth, which makes the bending moment of the single tooth of the gear larger, which is directly related to the theoretical shape of the tooth profile of the planetary gear and the half shaft gear, the backlash and the coincidence degree during the meshing process. The installation gear is out of fluctuation and causes the individual teeth of the gear to bear a large load, which has a great relationship with the error of the circumferential section after the gear machining. In addition, the small taper angle causes the single tooth strength to be weakened; the large end chamfer is too large and the back cone size is small, which reduces the contact area of ​​the gear to a different extent. In addition to the influence of the shape and machining accuracy of the gear itself, the machining quality and assembly quality of the cross shaft, the differential case, the gasket and the like also have a negligible influence.
Analysis of the problem of toothing requires a comprehensive consideration of various factors and the identification of key causes to completely solve the problem. High-quality gears have strict requirements on accuracy and require strict control of the gear production process.
6. Conclusion
In recent years, planetary gears, semi-axle gears, precision forging and mold manufacturing technology have developed rapidly, from material control, heating to precision forging, to mold processing, and subsequent heat treatment and machining. progress. Future precision forged planetary gears and half shaft gears will develop toward higher precision, strength and less meshing noise.
| Previous page | 1 | 2 |
Nylon Sanding Belt
This product is suitable for portable and desktop automatic grinding instruments, with elasticity and small grinding force, which can improve the grinding grain of workpiece well, and is easy to replace. Compared with traditional abrasive tools, nylon abrasive belt has the following advantages: it can control the minimum grinding amount, grinding depth, anti-blocking, and the probability of exceeding tolerance is the smallest. The product continuously exposes new abrasive layer during the grinding process, and the grinding effect is good.
1. Great multi-purpose belt, ideal for
cleaning, finishing, blending and deburring
2. Nylon
film backing is stretch resistant for close, ongoing cutting action
3. The film
backed belts work great on stroke sanders when reduced friction on the back of
the belt is desired
4. Gaps
between nylon fibers allow debris to escape, helping to reduce loading
5. Fibers
break down gradually to reveal fresh mineral, producing consistent cuts
6. Available
in a range of grades, minerals and converted forms,Coarse( Brown 150# ), Medium
( Red 240# ), Fine ( Blue 400# ) , Very Fine ( Grey 600 # )
Our Surface Conditioning Belt is a
durable belt engineered to perform detail work such as blending, blending
corners, cleaning, contour finishing, deburring, deburring edges, fine
finishing, flat finishing, setting the grain, stainless steel finishing, and
attaining straightline-brushed finishes on a variety of metals.
We distributes and wholesales various brands of Abrasive Sanding Disc, Cutting Wheels , Abrasive Flap Disc , Flap Wheels , Flap Disc Backing Pad, Flap Disc Adhesive, Abrasive Machine and Surface Conditioning Product etc, and enjoy a high position among consumers.
Ideal for Robotic Finishing
With a wide
range of conformability options and high consistency, long-lasting industrial
abrasives are a great option for robotic metal finishing. Surface Conditioning
Belts can generate a spec-required, aesthetic finish when used in both manual
and robotic processing.
Multi-Purpose Belt Great for Tackling
Multiple Applications
Working on
flat parts especially - requires a belt that will abrade the surface closely.
Our Surface Conditioning Film Backed Belt was designed to do just that. The
nylon-backed belt has a reduced friction backing and is low stretch, so it's
unlikely to yield or stretch when run. This belt backing works well when the
standard scrim belts stretch and fall off the machine.
Versatile Belt Options
One of the best benefits of our Surface Conditioning Film Backed Belt is its versatility. Offered in a range of minerals, grades and converted forms, you're likely to find the right match for your application. Choose between silicon carbide or aluminum oxide mineral. Aluminum Oxide is available in coarse (CRS), very fine (VFN), and medium (MED) grades. Silicon carbide is available in super fine (SFN), very fine (VFN), and medium (MED) grades. Aluminum oxide is a synthetic mineral known for its sharp cut, durability and long life. Silicon carbide tends to break down faster than aluminum oxide but will also produce a finer finish.
The Many Benefits of Our Belts Available in narrow, wide and standard sizes, this belt is commonly run on a belt sander. Given their narrow widths, narrow belts tend to be a good match for workpieces with narrow areas and nooks and crannies, like lobes on a crankshaft or camshaft. Conversely, wide belts are a good match for larger workpieces like stamped parts, sheet metal parts, or dies. Independent of belt chosen, operators can rely on consistent performance; it's what they've come to expect from our abrasives. Non woven technology makes our industrial abrasives - and belts - unique. A combination of fiber strands, resin, and abrasive mineral forms a thick, open web.
Surface Conditioning Belt work well to remove coarse grind lines, mill marks, or small burrs left by cutting tools or conventional abrasives. Abrasive belts come in many different widths and lengths and are used on a variety of different belt sanding tools for many different applications on both wood and metal.
Nylon Sanding Belt,Fiber Abrasive Belts,Woven Nylon Sanding Belt,Nylon Abrasive Sanding Belt,surface conditioning belt
Zhengzhou Jiading Abrasive Manufacturing Co.,Ltd , https://www.jiadingabrasive.com