The upper computer software determines the decomposition calculation of the unbalance according to the equal fraction of the workpiece. The triangular flange is divided into 3 equal parts, and the measurement result is decomposed in the 120-degree spindle coordinate system; the four-angle flange is equally divided, the end teeth are equally divided into 4, and the rectangular coordinate system is Decomposed, the result is 2 coordinate axis components. The user can set the minimum de-duplication value under the virtual instrument interface, and the system compares the decomposed two values ​​with the user-set minimum de-emphasis value. When the decomposition amount is less than the set value, the system judges that the component is not performed. Heavy, for the workpiece whose imbalance quantity distribution is close to the decomposition coordinate axis, the dynamic balance correction efficiency can be greatly improved. Is the system automatic flow chart.
Milling and De-duty Models There are three main types of de-weighting systems. It is shown that all three workpieces require a milling cutter for external arc de-duplication. In order to make the calculated cutting depth and angle accurate enough to achieve a high primary de-emphasis rate, the de-emphasis calculation of the system uses a combination of geometric calculation and curve-fitting compensation.
Establish a geometric calculation model: (depth, θ) = model (α, w, H, Ï, r, D, R, θ1, ε, I) (1) where the model parameters are defined as: H workpiece allows maximum depth of cut ;Ï workpiece de-surface material density; D workpiece dynamic balance de-radius; R workpiece cutting surface radius of curvature; θ1 workpiece surface circumferential cutting angle upper limit; θ workpiece surface circumferential cutting angle; depthα corresponding workpiece surface de-duplication depth; ε solution accuracy; w milling cutter width; α unbalance amount; I maximum cycle number; r milling cutter radius.
The expression corresponding to the de-weight is calculated by the de-weighting depth as follows: mass=compute(h)=ba
In the formula dcxdxdy×w×Ï(2), x and y are the abscissa and the ordinate, h is the de-emphasis depth, and mass is the unbalance. The integral field is the middle shadow part, a, b, c, d is the integral range, a is the inner side of the shadow part, b is the outer side of the shadow part, c is the lower end point of the shadow part, and d is the end point of the shadow part, and its size is The de-heavy depth is proportional to the circumferential cutting angle.
Therefore, the program flow for obtaining the corresponding de-duplication value from the unbalanced amount is as follows. At this time, the upper limit θ1 of the circumferential angle of the workpiece surface is determined by the cutting surface range of the workpiece surface and the maximum rotation angle of the equipment turret: (1) h=H, turn 2 ) mass=compute(h), turn 3(3) If mass<α, it is judged to exceed the maximum de-duplication ability of the device, and at the same time de-weight according to the maximum de-duplication ability, h=H, prompting the product to be a scrap, turn 5; If mass>α, while abs(mass-α)<ε, turn 5; otherwise, turn 4.
(4) Perform a two-point search on the depth of cut, h=h', if the number of searches reaches the maximum number of times I, record h, h at this time to 5; otherwise, use the searched h to 2.
(5) End of calculation, return h and maximum circumcision angle θ1.
In actual operation, there are certain errors in parameters such as size and density, or the tool geometry changes due to long-term use, and geometric calculations take linear processing on a part of the area, which makes the calculation result according to formula (2). After the weight, there is still a certain amount of out-of-tolerance imbalance, so the fitting curve compensation is used to further improve the accuracy of the de-duplication calculation. Using the curve fitting correction calculation, the first column in the middle indicates the unbalance amount, the second column is the de-heavy depth manual correction value (dark part), and the third column is the de-emphasis depth obtained by the integral calculation. When using curve fitting, the calculation method is a reference value. The user modifies the value in the second column according to the measurement data when the device is in normal use, and uses the data in the first and second columns in the curve fitting. Click Fit to perform a parameter calculation based on the least squares method; click Store to store the fit parameters. According to the geometric calculation results of the three workpieces, the fitting function is generated by using the combination of 0.6 and 1 curve.
The curve fitting function is of the formula (2): y=x0x+x1x0.9+x2x0.8+x3x0.7+x4x0.6(3) where x0~x4 are fitting parameters, and the fitting parameters are stored separately in the database for different workpiece types, and are selected in use. The corresponding workpiece type and the correction flag in the parameter setting are selected, and the fitting curve can be used to perform the de-duplication calculation.
The system described in this paper integrates the geometric calculation formula and curve fitting module into a separate static library file, which can be easily extended by replacing the library file. When changing the rotor type, it is convenient to apply the system to the automatic balancing of other types of rotors simply by reselecting the workpiece and other fractions and deduplication types.
Conclusion The automatic de-duplication combination machine proposed in this paper can take different operations according to the measured unbalance amount to improve the working efficiency. The outer arc milling method can maximize the dynamic balance correction, and the geometric calculation is combined with the curve fitting compensation. The method greatly improves the system's one-time deduplication rate. It is the result of partial test when three kinds of workpieces are combined using two methods.
(Finish)
WHAT ARE TRICONE DRILL BITS USED FOR?
Tricone bits, first created during the Great Depression, represented a significant leap forward in drilling technology. Tricone drill bits are the go-to solution for almost any well digging, from everything to simple water wells to industrial scale oil extraction. Tricone bits come in several different varieties, and can deal with a wide range of different rock formations. Most tricone bits are either Mill Tooth bits, or TCI bits (TCI stands for Tugnsten Carbide Insert), and there is an ideal tricone bit for soft, medium, or hard rock formations. It is important to know the type of formation you are drilling in when selecting a drill bit.
TRICONE DRILL BITS FOR SOFT ROCK FORMATIONS
Soft rock formations consist mainly of sand, clay, limestone or shale and are ideal for drilling with Mill Tooth Tricone bits. When working with soft formations you can use either sealed bearing or open bearing mill tooth tricone bits, depending on the scope and duration of your project. Sealed bearing tricone bits are longer lasting, but generally more expensive due to the precision work required to protect the bearings. Open bearing bits, on the other hand, are not as well protected and will wear out more quickly, however they are cheaper to manufacture. Tricone bits designed for soft rock generally have longer protruding teeth, [A" shaped teeth, or chisel shaped buttons. In all cases the teeth will be more widely spaced for tricone bits that are designed with soft formations in mind.
TRICONE BITS FOR MEDIUM ROCK FORMATIONS
If you`re drilling in calcites, dolomites, hard limestones, and some hard shale you`ll need a tricone bit designed for medium rock formations. You may want a TCI Tricone bit. To better understand why tungsten carbide is ideal it`s useful to know about its properties. First discovered in 1927, Tungsten carbide is an exceptionally strong and hard material, this allows it to withstand higher speeds for more rapid drilling. Additionally tricone TCI bits are much more capable at absorbing the significant amounts of heat generated without damaging the tricone drill bit. Medium formation bits have teeth that are far closer together than what you see with soft formation drill bits. Additionally the teeth are less protruding, although they may still come in a similar range of shapes.
TRICONE BITS FOR HARD ROCK FORMATIONS
Hard rock formations are hard and abrasive formations usually made up of hard shale, calcites, mudstones, chert, pyrite, granite, quartzite, and cherty lime stones. The difficulties of drilling in this material make a TCI tricone bit all but mandatory. The exceptional hardness and strength of TCI [buttons" for the drill bits allow them to endure very difficult drilling conditions. As with all tricone bits there is an option between sealed bearing and open bearing. Sealed bearing bits are considerably more protected from wear and tear and therefore suitable for much more use before being replaced. Gauge protection can also significantly increase the lifespan of a tricone drill bit. Bits designed for hard formations continue the trend of less protruding teeth placed closer together. The teeth will be very short and placed very closely together. This results in a much slower drilling speed than you would get with medium or soft formation drill bits, however if you are drilling through hard rock strata you don`t have much choice.
TRICONE BITS ARE IDEAL FOR SOFT, MEDIUM, AND HARD FORMATIONS.
Hopefully the above information has given you an idea of which tricone bit is ideal for the various rock formations you may have to contend with. For particularly advanced or ambitious projects you will want to carefully consider the type of tooth, additional kinds of seals, the importance of gauge protection, and estimated duration of the project in addition to the rock formation.
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