For building doors and windows that have undertaken important energy-saving and emission-reducing tasks, how to improve the energy-saving performance of doors and windows has become a problem that must be faced by the door and window industry. Door and window hardware is an important part in the door and window system. The following article discusses the role of aluminum alloy door and window hardware in the door and window system and the problems that should be paid attention to during the selection. It is hoped that the industry can communicate and make progress together. 1, door and window system What is a system? A system is a group of things that are interconnected and interact with each other. It can also be said that the system is an overall composed of related parts. A comprehensive analysis of the composition of the unit and the final composition, single refers to a unit or only focus on the macroscopic whole, is not a systematic approach. The system is an organic whole composed of different elements. The elements of the system and the system are relative. In one system, the elements are elements, and at another level, they are systems. There is a whole between the parts. Relationship. Door and window hardware system: Door and window hardware is only the accessories of doors and windows in the usual consciousness. Although there are also "hardware accessories are the heart of the door and window system", but the actual has not received real attention. The door and window hardware is composed of the handles (the term "handle" provided by the industry encyclopedia) components, transmission locking components, hinge components, auxiliary components, etc., through the system of matching and integration technology, serving Subsystem of the door and window system. There is also a need for systematic technical support and after-sales service. We can't simply say a certain hardware product, and we can't abandon the separate hardware components and talk about the concept of "door and window hardware system". A systematic concept should be established to make corresponding plans for various hardware products. In the framework of the large "door and window system", the changes of profiles, glass, rubber strips, processing technology, and even the opening and closing of doors and windows require the door and window hardware to make corresponding changes to better serve the doors and windows. 2, aluminum alloy door and window hardware in the door and window system When considering the problem of hardware matching in the door and window system, it is first necessary to have an overall research and understanding of the door and window system. Especially the design and selection of the profile size, it can be said that there is no good profile to be the cornerstone, and what kind of hardware can not be used to make good doors and windows. For the profile and hardware to be comprehensive considerations, be careful not to select the profile, then select the hardware. This situation sometimes leads to the lack of matching hardware due to the non-standard profile. Now most real estate developers will consider the combination of profiles and hardware, and then give them a choice. The choice of accessories should consider its versatility and rationality, while considering the processability and material quality of the parts production. Of course, there are also matching options. This situation will definitely bring difficulties to hardware matching. Load (entry "load" provided by the industry encyclopedia) matching requirements for doors and windows hardware accessories: when selecting hardware, first of all to ensure the three-sex function of doors and windows (wind pressure, water tightness, air tightness) and insulation, insulation Performance requirements such as heat and sound insulation. In 2012, the Ministry of Housing and Urban-Rural Development re-enacted GB50009-2012 "Building Structure Load Specification". Increased and adjusted various parameters such as temperature action, variable load, accidental load, permanent load, wind load height variation coefficient and mountain topographic correction coefficient (the term "correction factor" provided by the industry encyclopedia), etc. The content and method of vibration calculation have been greatly improved and improved. The basic snow pressure and basic wind pressure values ​​of some cities were adjusted, and a new national basic snow pressure and basic wind pressure map were drawn. Provide a more detailed theoretical basis for our calculations. In different regions and different environments, the safety and wind pressure requirements for doors and windows are not the same. It is necessary to comprehensively calculate various parameters to determine the location and quantity of red dots to ensure the required performance requirements. In general, the more lock points, the stronger the wind pressure resistance of doors and windows. At the same time, we must also consider the configuration of the lock point. Only when the number and layout of the lock points in the door and window are properly selected will the multi-point lock play the most effective role. Under the premise of ensuring the performance of doors and windows, optimizing the lock layout and reducing the hardware use cost is the optimal combination. The calculation of the number of lock points is complicated. Here, a simplified calculation formula for the number of lock points is recommended: Let n a lock point number; W a fan width; H a fan height; Wk a standard wind pressure; a safety factor of 2.5 times, then n = W × H × 2.5Wk / 0.8 (pieces) Calculation example: For a building in a certain place, the calculated Wk is 2.2KN/m2, and the number of locks with a height of 1.2 high and a width of 0.6 m is required: N = 1.2 × 0.6 × 2.5 × 2.2 / 0.8 ≈ 5 (pieces) After determining the number of lock points, it is necessary to select the adapted hardware category according to the shape of the door and window profile section (the term "section" is provided by the industry encyclopedia). Different hardware types, the shape and use of the lock points are not the same, generally the hinges or sliding supports of the casement window are regarded as lock points. Door and window hardware and profiles: Any product, including hardware, has its scope of application. There is no versatile hardware that can match all door and window profiles. In this respect; carefully selected according to the requirements of the customer and the basic functions of the window. As far as aluminum (the term "aluminum" is provided by the industry encyclopedia) alloy door and window profiles, the profile of the profile of the domestic aluminum alloy interior doors and windows is relatively standardized, more than 80% of which are European standard groove profiles, which are simpler to select. The cross-section of the profiled windows and doors is quite complicated. The frame fans have grooves, the frame fans have no grooves, the frame has no grooves, and the fan-shaped profiles are different. The groove size of the grooved profiles also changes. The profiles of aluminum alloy sliding doors and windows are more diverse, and the dimensions of profiles such as hook, light, edge, bottom, and slide are different for each profile manufacturer. According to the characteristics of the profile, the selection should be based on the principle that the structure of the profile is not damaged as much as possible, and the installation and adjustment are convenient, and the performance requirements of the door and window are guaranteed. Therefore, the choice of hardware needs to be analyzed according to the specific section of the profile and reasonable choice. Through the above analysis, we can have a preliminary understanding of the selection of door and window hardware. The diversification of aluminum profiles in the Chinese market has led to unique limitations in the current configuration of hardware. The following hardware principles for aluminum alloy doors and windows can be combined: (1)) First of all, we must consider the wind pressure resistance and airtightness required for doors and windows (the term "airtight" is provided by the industry encyclopedia) performance and stability: (2) Select the hardware manufacturer with reasonable quality and reasonable hardware accessories by the size of the door, window sash, profile shape and opening method; (3) When there is wind pressure resistance requirement, determine the number of lock points and layout scheme according to the local wind pressure standard value and the height of the floor to ensure the required wind and pressure resistance, airtight performance and stability of doors and windows. Claim. (4) Guaranteed safety: At the same time, considering the factors determined by the width of the door, sash, and weight, the load-bearing grades, specifications, and dimensions of load-bearing components such as hinges (hinge), sliding stays, and pulleys are selected. Concerned about surprises Label: The role and attention of aluminum alloy door and window hardware in door and window system Previous: Stainless steel screw use note points Next: Wire and cable industry aluminum conductor instead of copper conductor analysis Quality Carbide Center Drill Bit for Metal Application of center drills
Center drill bits, also known as Slocombe drill bits, are used in metalworking to provide a starting hole for a larger-sized drill bit or to make a conical indentation in the end of a workpiece in which to mount a lathe center. In either use, the name seems appropriate, as the bit is either establishing the center of a hole or making a conical hole for a lathe center. Nevertheless, because of the frequent lumping together of both the terminology and the tool use, suppliers may call center drill bits combined-drill-and-countersinks in order to make it unambiguously clear what product is being ordered.
1). Center drill types are commonly used to drill holes which provide small diameters. Mostly used to create pilot holes, they are very useful as they can guide the worker to correctly perform the holes he needs. Once the hole is located in the right place, the center drill has to be replaced with a normal drill which provides the right diameter. However, in order to use the center drill, you have to provide the proper lubricant so that the drill`s tip is not going to be twisted off while performing a specific task.
Quality Carbide Center Drill Bit for Metal,Quality Carbide Center Drill , Carbide Center Drills For Lathe,Hot Sell Fully Ground Center Drill Changzhou Bomitools Co.,Ltd. , https://www.bomitools.com
HSS Fully Ground DIN338 Center Pilot Drill Bit For Metal Hole Saw
1, PROCESS:MILLED ROLLED,FULLY-GROUND
2,MATERIALS:HSS OR HSS-COBALT
3,APPLICATION MATERIAL:STEEL,CASTIRON OR OTHER SOFT METAL
4,SURFACE TREATMENT:WHITE,BLACK,TIN-COATED
5,SIZE:0.2-30.0mm
stub drill:DIN1897
normal drill:DIN338
long drill:DIN340,longer drill:DIN1869
Type:Twist Drill Bit
Use:Metal Drilling
Working Length (mm):13mm
Finish:Plain
name:HSS Fully Ground DIN338 Center Pilot Drill Bit For Metal Hole Saw
Material:M35/M2/4341/4241
Certification:ISO, ISO9001
Customized:Yes
Packing:Factory default bulk or Customized
Shank:Round/Three-flatted/Hex shank and so on
Process:Fully ground