American Steel Line
November 13, 2009 
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stainless steel pipe fittings screw Tapping points within
Our company is Zhejiang famous stainless steel pipe fittings manufacturers, welcomed the new and old customers coming! stainless steel pipe fittings screw Tapping points within the company, prepared and provided by the company's Web site www.hlpipefittings.com
stainless steel pipe fittings commonly used on the tap for internal thread tapping process. As the stainless steel high viscosity, chip breaking performance is poor, so vulnerable to the process of tapping chip scratch work
Pieces of thread or tap chipping phenomena affect the quality of processing efficiency and thread. In order to extend the life tap to improve the quality of thread processing, should observe the following.
Design and manufacture of a tap
(1) use better tap material. In general high-speed tool steel to add special alloying elements, can significantly improve the wear resistance and toughness tap.
(2) in the tap thread coated with titanium nitride coating surface, can significantly improve the tap of the abrasion resistance, heat resistance and lubricity.
(3) increase the tap before the appropriate angle. It should be noted, such as tap front too large knife in the back when the easily lead to chipping and tap out the threaded multi-row attack.
(4) the appropriate amount of increased tap shovel back. It should be noted, such as the shovel back too large knife in the back when the chips into the tap prone to the phenomenon of post-horn, and attack out of the thread finish poorly.
(5) a reasonable choice tool heat treatment methods to tap both the hardness and toughness.
2 piece bottom of the pre-Jjn-r
(1) should be as small as possible amount of spirit Tapping the principle of pre-processing parts of the end of larvae L size, especially the American standard NPT thread and the British standard f, r thread, the taper of 1:16, while the majority of stainless steel
Manufacturers is based on the small end diameter threaded hole for tapping cast a straight bottom larvae L, resulted in the latter part of processing a large amount of tapping, easily lead to the following adverse consequences:
① tapping torque large tap easy to break or chipping;
② attack poor finish out the thread;
③ attack out of the cylinder threads with plug detection diameter is smaller, the reason is not inconsistent thread in diameter, but because chip scratch thread, there are glitches.
(2) L size is best for the end of larvae was threading the path size of the margin with 0.1-0.2mm.
(3) expansion of larvae L before tapping the best use of customized processing reamer. For American Standard Nf, r thread and British standard f, r thread, taper the end to be processed into larvae L. At present, many enterprises to adopt waste manual tap
Wore off thread reamer made to obtain secondary use of waste tap. However, restructuring reamer should pay attention to two problems: ① wore off when the thread must be milled horn; ② tap blade front surface should be maintained
Flat straight.
3, the rational use of tap
(1) processing of different types in different parts of the chip to be taken into account. When necessary, also need a new tap for grinding, grinding principle is tapping chip calm as possible when the chip discharge groove to prevent scratches have been
Processing thread.
Examples are as follows:
Example 1. Processing Coupling (SPU): Coupling of Tapping the best use of vertical tapping machine (or three tapping machine). Taps grinding method: ① longer tap the Department before the orientation to tap into the increasingly
Into the cutting, to
Increase tap life; ② in tap grinding have each blade edge flap angle, but the grinding should not be too long for the first time (about 3-4mm), which could later be gradually extended. To judge the quality of the standard blade sharpening angle
Standard for the chip when tapping
Into a horn-like discharge from the collar end, no injuries have been tapping out the thread (see Figure 1). When the tapping for some time after the attack found a thread of poor quality, can be combined with long-edge angle
.
Figure 1, the chip into a trumpet-shaped exhaust
Example 2. Processing blind larvae L, links and elbow: spiral groove can be used tap, tap handle as far as possible from the Department of chip discharge.
(2) The tap is workpiece with the impact of different heart is an important reason why life tap, it will tap in the tapping process Shouli Bu both, resulting in premature fatigue failure or fracture tap
. Different factors affecting the heart, including machine tool spindles, tap fittings, tap shank, is workpiece and fixture manufacturing quality and adjustment of fixtures and machine tool table quality. Solve
Methods for the use of qualified tap fittings and fixtures, fine-tuned machine. In addition, during processing of the rod tap connector and the machine will not pull too tightly, so that the activities of a slight tap connector
Point; tap tap connector connected with the top wire not too tight, so tap to self-centering.
(3) tap tap of life and the quality has much to re-grinding. Taps should pay attention to re-grinding the following questions:
① Processing elbow and three links of the British standard frr, American Standard NFF thread, when tapping to the thread line size may be two situations collide tap end, the reason is the basal plane than tap
Long. In this case, the need to tap short-end mill, end mill, but, after a short tap of the use of performance may be adversely affected. From Figure 2, Figure 3 shows a short tap end mill before and after wire
Cone and is the relationship between the workpiece can be seen, end mill, after a short tap the thread into the hole can not be normal, but by end pressure into the hole, thus affecting the use of tap performance.
Figure 2 End Mill short tap tap before the Figure 3, after a short end-mill
To solve this problem, some users have to tap their own prior guidance on the Department of grinding, grinding before and after the tap other parts of the former orientation shown in Figure 4, shown in Figure 5. Since the first direction after grinding
Department of shape change, still will affect the tap performance. Solution to this problem is when grinding the Department must maintain the original pre-oriented geometry, it is best to use tap grinder cutting blade
For grinding (also available on hand grinding wheel machines). To solve a long tap base surface is the best way to be processed according to the specific requirements of thread short custom base surface tap.
Figure 4 Figure 5 normal tap
② tapping tap becomes dull after a period of time, then we must tap grinding time, but after the tap grinding often poor or non-use of durable, because the tap is generally re-grinding wheel in the floor
Hand-grinding machine (grinding the thickness of 5 ~ 6mm or thicker), can not guarantee that tap the groove after grinding, front and tank finish. Tap grinding before and after the groove and tapping all the time
Debris flows are shown in Figure 6, shown in Figure 7.
Figure 6 pre-tap grinding groove and tap in Figure 7 after grinding groove and tapping the chip when the chip flow when the flow of tapping
Practice has shown that processing of stainless steel pipe fittings to tap the best of 13 before the horn. About. Such as the front is too large, thread tap back knife attack when finished easily chipping; such as the former angle is too small, then the attack out of the thread clean
Is lower, and greater resistance tap tapping. In addition, when the tap is easy to form grinding blade angle, will change the chip flow.
4 Tapping Oil Selection
On the stainless steel pipe fittings for processing when tapping, tapping oil use is also important. Tapping the oil must have good cooling, lubrication and anti-rust function. Such as tapping oil lubrication is not good, then
Poor finish out of the thread tapping, and tap tapping large resistance. Such as tapping oil cooling effect is not good, then tap easily stick teeth, that tap threads and easy to bond stainless steel front surface of the chip. Mining
Special stainless steel tapping oil is better, can be used directly. In addition, essential oils and oil can be used self-tapping configuration, but the ratio will be appropriate. Slurry processing machine tool industry
Select country engaged in slurry production and processing enterprises of their parts, both face machining tool of choice. The main feature of slurry fluid transport pathways are highly
Wear or corrosion resistance, it is suitable for conveying abrasive or corrosive slurry, its products are widely used in mining, metallurgy, petroleum, coal, transport, electricity, building materials and municipal works
Industry, for mining, dredging, transportation tail, fine sands, ash, Coal, iron and other strong abrasive, high concentration slurry transport. Currently most of the slurry pump wear parts material
Are made of high chromium cast iron, high chromium cast iron casting hardness up to 65HRC can about the current performance of one of the best wear-resistant materials, the alloy content and more complex production process, from the 20th century 8o
Age began to be used in China. 90's, their general use of carbide tools machining, processing complexity, high cost and low efficiency, which has been locked in difficult machining
Interference with many machining factory. Ceramic tool in modern metal cutting tool of a new material, which is characterized by high hardness, high strength, high red hardness, high wear resistance and excellent
Good chemical stability and low coefficient of friction, not only can not process some of the common blade processing hard material, but also improve productivity. Ceramic cutting tools in a number of slurry production
Manufacturers use to prove, it can really solve the high chromium cast iron machining difficult, not only can effectively reduce production costs, and can greatly increase productivity. Currently, many students
Producing ceramic tool manufacturers, tool material more categories, large differences in performance, a good solution to cutting high chromium cast iron, ceramic cutting tools on the correct choice is extremely important. If choose not to
When, not only affects the wide use of ceramic cutting tools, will also affect the user's production, resulting in users losing confidence in the ceramic tool, has been using a common tool processing, affect the company's issued
Exhibition
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Our company is Zhejiang famous stainless steel pipe fittings manufacturers, welcomed the new and old customers coming! stainless steel pipe fittings screw Tapping points within the company, prepared and provided by the company's Web site http://www.hlpipefittings.com
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