3D adjustable concealed hinge is a kind of height-end door hinge for interior wood doors, aluminum profile doors, and steel fire-rated doors. It is completely hidden after installation, more beautiful than ordinary butt hinges, and can adjust the relative position of the door leaf and the door frame from three directions.
SDH hardware, as a professional concealed door hinge manufacturer, will give you a comprehensive introduction to the product of 3D adjustable hinges from four angles: the manufacturing of concealed hinge, the installation of the concealed hinge, the test standards of the concealed hinge, and the advantage of the concealed hinge. I hope it can be helpful to you.
Production
The material of the 3D adjustable concealed door hinge
Now there are concealed hinges made of cold rolled steel, stainless steel, brass, and zinc alloy in the market. Among them, the best-selling is the hidden hinge made of zinc alloy.
Zinc alloy material is an alloy made of zinc metal as the base material, adding aluminum, copper, magnesium, cadmium, lead, titanium, and other metals.
Traditional die-casting zinc alloys include No. 2, 3, 5, and 7. Our company chooses No. 3 zinc alloy materials.
Advantages of this No. 3 zinc alloy material:
1) Low melting point, melting at 385°C, easy to die-cast.
2) After melting, it has good fluidity, is easy to cast, and has stable dimensional durability.
3) It does not absorb iron during melting and die casting, does not corrode the pressing type, and does not stick to the mold.
4) The surface of the casting is smooth and easy to electroplate, and the intuitive effect after electroplating can be comparable to that of brass.
5) Corrosion resistance in the atmosphere.
Reliable raw materials play a vital role in the structural strength and subsequent surface treatment of the hinge. Inferior zinc alloy materials contain more impurities, which will cause sand holes in the hinge during the die-casting process, which will affect the structural strength of the hinge and is not conducive to surface treatment.
Processing technology
Die-cast
Process the zinc ingot into the hinge blank through the die-casting machine and the mold.
The zinc ingot is melted, injected into the cavity of the mold under high pressure, and taken out after cooling. A complete process is called mold clamping. (Demoulding, mold closing), a set of molds can make several parts at the same time. During the mold design, the acupuncture points will be designed according to the actual parts of the hinge.
How to judge the quality of die castings?
When judging the quality of die-casting parts, you must look at the die-casting rough parts. Polishing can cover up the die-casting marks and make them invisible to the naked eye, but it cannot solve the problem of die-casting marks. Check the workpiece that has just been die-cast. It is white and has uniform silky lines, which indicates that the die-casting quality is good. If the surface of the workpiece is cloudy and has stars, it means that the die-casting quality is not good.
Polishing and Machining
Machining (sampling inspection of die-casting, sampling inspection of polished parts, full inspection of machining process)
After the casting blank is inspected, it is sent to the polishing workshop
Grinding the parting line – cleaning the hole – grinding (edge, surface)
– tapping-vibration grinding-inspection-paper wrapping-electroplating
electroplating
Electroplating process
preprocessing- basic electroplating (copper & nickel plating) – plating color
pre-processing
Soaking (heated saponification solution) – water (2 times) – ultrasonic dewaxing (heating) – water (2 times) – ultrasonic degreasing (heating) – electrolytic degreasing (degreasing powder) -Three washes (ultrafiltered water: water filtered from tap water)
Basic Plating
Alkaline Copper Plating – Water – Activation – Water – Coke Copper Plating – Water – Activation – Water – Acid Copper Plating – Water – Activation – Water – Nickel Plating
Plating color (after the last step of “nickel plating” in basic electroplating) – water – activation – water – plating color
Inspection
After the electroplating of the hinge parts is completed, they will be fully inspected by the inspectors, and the parts with defects such as air bubbles, watermarks, scratches (bumps), etc. that affect the appearance of the product will be selected to ensure that the products put into the warehouse have no obvious defects.
assembling
After checking the bill of materials is correct, start product assembly
Assembly process
Install the shaft sleeve on the rocker arm – oiling – install short riveting pins (three pieces) – install the shaft sleeve – oiling – install riveting pins on the left and right front and rear rocker bases
– Lock M5 screws-Install the base of the upper and lower rocker arms – Install the left and right main bodies – Install the upper and lower main bodies – Adjust the scale – Package
The 3-way adjustable concealed hinge installation
Determine the opening position of the door leaf and the door frame according to the following installation method (the left-handed door and the right-handed door are the same), and you should make sure that the axes of the hinge installation holes on the same door leaf or door frame are on the same vertical line, so as to prevent the door leaf switch from being not parallel or the door Inconsistent seam size
Remarks:
Two hinges are installed for doors with a height below 2.1m, and three hinges are required for doors with a height of 2.1m to 2.4m.
The Test Standard of 3D Adjustable Concealed Door Hinge
BS EN1935
The test is mainly based on single-axis hinges, and it is not clearly stated that it is suitable for concealed multi-axis hinges
The durability test is level 7, with 200,000 cycle times
Deformation: horizontal ≤ 0.5mm vertical ≤ 1.0mm
ANSI A156.1
There are tests to distinguish concealed multi-axis hinges
Durability test is 200,000 times
Deformation: horizontal ≤ 1.6mm vertical ≤ 1.6mm
The advantage of 3D adjustable concealed door hinge
1. The 3D adjustable hinges are installed in the grooves on the door leaf and the door frame. When the door is closed, the hinges are not visible from indoors or outdoors and are completely hidden. So the concealed hinge has a certain anti-theft function.
For the butt hinge: the leaf is installed close to the door leaf and the door frame’s avoidance groove, and the shaft exposed from the hinge can be seen from indoors or outdoors when the door is closed. It does not have anti-theft function, anti-theft needs to be equipped with anti-theft nails (buckles).
2. After the adjustable hinge is installed, the position of the door can be adjusted from three directions of X axis, Y axis, and Z axis.
3. All the rotating parts of the 3D adjustable concealed hinge are connected by high-performance modified POM bushings.
POM has excellent impact resistance and fatigue resistance, and its strength is comparable to that of steel.
Its good self-lubrication makes the door more silent during the opening and closing process.
The door weight has a great influence on the structural design of the three-dimensional adjustable hidden hinge. The thickness of the arm, the size of the rotating shaft, and the thickness of the bushing are directly related to the load-bearing of the hinge. After the hinge is designed, it will follow the initial design. Do 200,000 times of fatigue resistance test.
When purchasing an adjustable hinge, you need to refer to the door weight, and the actual door weight should be below the load-bearing capacity of the hinge; the door height and the door width determine the quantity of the hinge, generally, the third or fourth hinge is avoiding the door deformed; the door thickness and door profile determine the hinge width and depth, it’s also why we have so many different size hinge for the same load capacity.
Conclusion
This article introduces 3D adjustable concealed hinges systematically in detail. SDH hardware is a professional manufacturer and exporter of 3D adjustable concealed door hinges. If you want to know more about our door hardware product line, or ask for samples and a price list, please contact us freely by:
Email: alfred@euprotek.com
WhatsApp: 0086-13869164675.
