Holland Mesh Fence
* Using high quality iron rod as raw
material, the welded panel or rolled fence, after Galvanization, PVC
Powders dipped coating; it can resist the corrosive and ultraviolet
radiation very strongly.
Selection of high-quality wire welded
together, the PVC or PE, PP powder after curing the surface of the
coating, with strong adhesion, corrosion resistance, bright color and so
on.
Manufacturing process: steel wire after the plastic coating, but also a separate plating, hot-dip and plastic coating.
* Mushroom special Tubes (48*1.5mm) is designed refined and scientific, with plastic caps on the top of the post.
The finished surface usually is
Galvanized and Powder coating, or alternatively. It usually uses
installation method of burying additional 50 cm pass panels height into
the earth. Special sizes can be provided as the client`s request.
Holland Mesh Fence,Welded Holland Fence,Wire Mesh Holland Fence,Holland Wire Mesh Fence HeBei Bosen Metal Products Co.,Ltd , https://www.bosenfence.com
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Precision after fine bearing device Precision after fine bearing device
1. The precision progressive method bearing is finished after the end of the device in the main machine; if the radial runout of the measuring spindle is measured; it can be found that the measured value of each revolution has a certain change, and the measurement is performed successively; it can be found that after passing the certain number of revolutions; Approximate repetitive rendering. The target for measuring the degree of such change is the cyclic rotation precision; changing the number of revolutions required to approximately repeatedly render represents the "quasi-period" of the cyclic rotation precision; the magnitude of the magnitude change in the quasi-period is large; Poor rotation accuracy for the cycle. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
For example, the preload is properly applied to the main shaft; the rotational speed is gradually increased to the near-operation speed; the "run-in" effect of the bearing is implemented; the cyclic rotation accuracy of the main shaft can be improved.
2. One way to improve the accuracy of the bearing is to produce a fine instrument in a factory; the main shaft is used with the 6202/P2 type bearing and its accuracy is still not satisfactory; the rear journal is thickened and a raceway is made on it to replace the inner ring; Measured in detail; each set of three scales; each set of steel balls is separated by a distance of nearly 120°; because it reduces the appearance of a heavy machining; it also reduces the appearance of a cooperation; together, the rigidity of the shaft-bearing system is improved; The maximum three and the smallest three steel balls are nearly equidistantly distributed; the axis reversal accuracy is improved; therefore, the accuracy requirements of the instrument are satisfied.
3. The inductive verification method of the device accuracy is to install the angular touch ball bearing into the main shaft; the verification order of the device accuracy is as follows (for example, a general lathe with a shaft diameter of 60 100 mm):
(1) Measuring the dimensions of the shaft and the bearing housing hole; to determine the cooperation precision of the bearing; the cooperation requirements are as follows;
The inner ring and the shaft adopt an interference cooperation; the interference is 0 to +4 μm (0 at light load and high precision).
The outer ring and the bearing housing hole adopt a clearance cooperation; the clearance amount is 0 to +6 μm (but when the bearing at the free end uses the angular touch ball bearing; the gap can also be increased),
The circularity of the shaft and the seat hole is less than 2 μm;
The end face parallelism of the spacer used for the bearing is less than 2 μm;
The outer end surface of the shoulder is bounced below 2μm.
The bearing seat hole shoulder jumps to the axis below 4μm.
The inner end surface of the front cover of the main shaft has a jump of 4 μm or less;
(2) Fixed-end front bearing on the shaft.
Completely remove the bearing with a clean, clearing oil;
The grease is smooth; the organic solvent rich in 3% to 5% smooth grease is first written into the bearing for degreasing; then the quantitative grease is filled into the bearing with the oil gun (10% to 15% of the bearing space volume) ),
Heating the bearing to raise the temperature by 20 to 30 ° C; use a hydraulic press to load the bearing into the shaft end,
Pressing the adapter sleeve against the shaft and axially positioning it against the bearing end face with a suitable pressure.
Roll the belt of the spring balance on the outer ring of the bearing; verify whether the regular preload can be changed greatly by measuring the starting torque (even if the bearing is correct; but because of the deformation of the cooperation or cage; the preload also changes) Can)).
(3) Insert the bearing shaft assembly into the seat hole.
The seat hole is heated to raise the temperature by 20 to 30 ° C, and the bearing shaft assembly body is installed into the seat hole with a gentle pressure.
Adjust the front cover; make the front cover tightening amount 0. 02 ~ 0. 05μm;
Taking the outer end surface of the bearing seat as the reference; the head of the dial gauge conflicts on the outer surface of the journal; the shaft is rotated to measure its beating; the demand error is below 10 μm.
Position the dial gauge on the shaft; the head conflicts with the inside and outside of the seat hole; rotate the shaft to measure the coaxiality of the front and rear seat holes of the bearing housing.
(4) Selecting the free end bearing in an orientation capable of canceling the error; supporting the bearing after the device is placed to the bearing housing; and canceling the roundness error and the coaxiality error between each other as much as possible.
4. The device with tapered bore double row short cylindrical roller bearing is equipped with NN3000K series tapered bore double row short cylindrical roller bearing; it is necessary to pay attention to the correct matching of the inner diameter of the bearing and the taper of the shaft; the coloring method can be used in the case of less production value. Perform touch verification; but when the production volume is large; it is best to use a fine cone gauge to verify.
When the bearing is mounted on the tapered shaft; the inner ring should be axially adjusted to the proper orientation; its radial clearance is close to zero.
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* Euro
fence has good anti-corrosion properties, anti-aging, elegant
appearance. Easy to install Can be widely used in industrial,
agricultural, municipal, transportation and other industries fence,
decoration, protection and other facilities. With good filtering
accuracy, high load strength, low cost.
Precision after fine bearing device
Source: Bearing network time: 2014-09-12