Detailed explanation on assembly technology of LY pvc doors and windows

Door and window selection
First, please carefully review the engineering drawings, determine the type and number of windows required according to the drawing style requirements, and determine the thickness of profiles and steel linings in combination with local wind pressure, hole size, floor height and other factors.

Door and window design
According to the blanking rules of this type of profile, alert and optimize the blanking design, including the selection of glass, hardware, steel, dogma, wool top and other auxiliary accessories for blanking design. Make blanking process sheet.

Profile cutting, milling drain hole and lock hole
A. The main profile is generally cut by double diagonal saws. 2.5mm~3mm allowance shall be reserved at each end of the material, the tolerance of welding blanking shall be controlled within 1mm, and the angle tolerance shall be controlled within 0.5 degree.
B. Drain holes shall be milled for frame profiles, and drain holes and air pressure balance holes shall be milled for sector profiles It is required that the diameter of the drain hole is 5MM and the length is 3MM. The drain hole should not be set in the cavity with reinforced section steel, nor can it penetrate the cavity with reinforced section steel
C. If the driver and upper door and window are to be installed, the lock hole shall be milled.

Assembly of reinforced section steel
When the dimension of the door and window structure is greater than or equal to the specified length, the inner cavity must be reinforced with section steel In addition, reinforced profile steel must be added at the hardware assembly place and the splicing place of the combined door and window. The assembly of reinforced profile steel shall be inserted and fixed in advance at the position that does not affect welding. The profile steel at the position where the ten ampere type and T-type connections are capable of receiving shall be inserted just after the welding plate is lifted up after the profile is melted, and fixed after welding.
The number of fasteners for reinforced section steel shall not be less than 3, with a spacing of no more than 300MM and a distance of no more than 100MM from the end of the section steel.

welding
During welding, pay attention to the welding temperature of 240-250 ° C, feed pressure of 0.3-0.35MPA, clamping pressure of 0.4-0.6MPA, melting time of 20-30s and cooling time of 25-30s.

Corner cleaning and rubber strip installation
A. The angle cleaning worker shall clean the angle and mechanical angle. After welding, the angle can be cleaned after cooling for 30 minutes.
B. Install different types of adhesive strips, frame and fan adhesive strips on the frame, fan and glass beads after corner cleaning as required; The length of the adhesive strip shall be about 1% long to prevent the adhesive strip from retracting.

Assembly of hardware
The finished products of plastic steel doors and windows are assembled by both frames and leaves through hardware. The principle of hardware assembly is to have sufficient strength, correct location, meet various functions and be easy to replace. The hardware should be fixed on the inserted reinforced lining steel. Ordinary wood screws cannot be used to fix the hardware. Generally, 40MM self tapping screws are used. The installation position of the hardware should also be strictly in accordance with the standard.

Glass installation
At the position where the glass is to be installed, first place the glass cushion block, place the cut glass on the cushion block, and then fix and clamp the glass through the glass bead.

Finished product quality inspection
After the plastic doors and windows are assembled, strict quality inspection shall be carried out
A. Visual inspection: the surface of doors and windows shall be smooth and clean, free of bubbles and cracks, with uniform color, smooth welds, and no obvious scars, impurities and other defects;
B. Visual dimension inspection: strictly control the quality of doors and windows within the allowable deviation of national industrial standards;
C. The sealing strip shall be assembled evenly, and the interface shall be tight without slotting;
D. The sealing strip shall be firmly assembled. The gap between the joints at the corners shall not be greater than 1mm. Two or more strips shall not be used on the same side;
E. The hardware fittings shall be installed in correct position, complete in quantity and firmly.
F. In the continuous production process, the fillet strength shall be tested regularly (the average value shall not be less than 3000N, and the minimum value shall not be less than 70% of the average value). In case of any nonconformity, find out the cause, solve it in time and ensure the quality of finished products;
G. In addition to the routine inspection, the mechanical and physical properties of the finished products shall be inspected regularly.

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