faq
1. Why is there a minimum margin setting? Is the minimum margin from the hole center to the bending edge, or to the edge of the material? If my minimum margin is not enough, what hidden dangers will there be?
A : The minimum margin is the distance from the circular edge of the hole to the edge of the workpiece.
If the hole is too close to the edge of the plate, it means that the thin plate at the edge is not strong enough. After the rivet nut is installed, the following may happen:
The edge of the thin plate is squeezed and bulged and deformed; the nut is not installed firmly and is easy to fall off.
2. The PC plastic containing glass fiber we use, when embedded in the copper nut through mold injection molding, the BOSS column around the copper nut cracks. How to deal with this situation?
A : This is internal stress cracking, which has nothing to do with the copper nut you bought (unless the nut has oil). Almost all plastic products have internal stress, and PC+glass fiber is more obvious. This is determined by the characteristics of the molecular chain itself. There is no perfect solution at present, and the direction of improvement is to eliminate internal stress:
①. Buy "better" particles for raw materials. (Original particles)
②. The copper nut cannot have oil, and the nut should be heated to about 100-150 degrees before being placed in the mold (put it in with heat-insulating gloves)
③. Appropriately increase the barrel temperature to about 300 degrees (depending on your company's materials), and appropriately increase the mold temperature to about 100-150 degrees.
④. Anneal immediately after demolding. The oven temperature is about 100-150 (depending on your company's materials) and air-cooled after 2 hours. If conditions permit, perform secondary annealing at 80-100 degrees and air-cool after 1-2 hours.
⑤. (If the design allows), increase the wall thickness of the BOSS column, or add 4 reinforcing ribs (wedges) to the outer wall of the BOSS.
The above purposes are to eliminate internal stress.
3. The hot melt temperature is 320°C, and the plastic material is PC. After hot melting, regular scratches and copper powder were found on the surface of the nut. What's going on?
A: The copper powder dropped during the hot pressing process means that the copper rod used to make the nut is most likely a continuous casting rod. Under normal circumstances, copper nuts should be produced using extruded rods. Please check the information on the difference between continuous casting rods and extruded rods. In a nutshell, continuous casting rods are cheaper, but continuous casting has defects such as pores, looseness, and inclusions, and powder may drop or be scraped during hot pressing. You can verify with your supplier and suggest that your supplier replace the raw materials of regular manufacturers (such as Bowey, Jintian, etc.).
4. The copper nuts used in our products are required to be completely non-magnetic and must pass the strong magnetic field test, so they cannot contain any magnetic non-ferrous metal elements. However, the C3604 brand still contains trace iron elements. Do you have such heat-staking inserts that do not contain any magnetic elements?
A: Almost all brands of brass materials contain trace iron elements, and the presence of iron elements is not a sufficient condition for metals to be magnetic. However, brass nuts do have slight magnetism. We have tested copper nuts made of red copper, but found that they still have slight magnetism. It is probably related to machining.
Annealing (note: annealing softens the nut and affects its mechanical properties, which is not a good solution) can make the copper nut almost unobservable under the action of a strong magnet. Here, it means that it is almost unobservable by human observation, and a small reading can still be detected by a gauss meter.
But your requirement is "completely non-magnetic", that is, 0 gauss. This should not be achieved.
5. When using FSH and SPH type cold pressed nuts, can the bolt be screwed in from both ends of the cold pressed nut, or only from the end of the cold pressed nut?
A: Does the situation you are talking about mean that the reserved hole of the plastic part is a through hole?
Whether the reserved hole of the plastic part is a blind hole or a through hole (although this application scenario is very rare), the screw is screwed in from the "big head" direction of the FSH and SPH nuts.
6. Rusting of stainless steel fasteners:
A: Stainless steel is not rust-free, it is just not easy to rust. When the protective film on the surface of stainless steel is damaged, it will rust. For example:
①.Dust or foreign metal particles containing other metal elements are deposited on the surface of stainless steel. In humid air, the condensed water between the attachment and the stainless steel connects the two into a micro-battery, triggering an electrochemical reaction. When the protective film is damaged, electrochemical corrosion occurs.
②.Organic juice (such as vegetables, noodle soup, sputum, etc.) adheres to the surface of stainless steel. In the presence of water and oxygen, it forms organic acid and corrodes the surface protective film.
Substances containing acids, alkalis, and salts (such as alkaline water and lime water splashing for wall decoration) adhere to the surface of stainless steel, causing local corrosion.
③.In polluted air (such as an atmosphere containing a large amount of sulfide, carbon oxide, and nitrogen oxide), condensed water forms sulfuric acid, nitric acid, and acetic acid liquid spots, causing chemical corrosion.
④.In coastal areas, due to the proximity to the sea, the air contains a lot of salt, which will corrode stainless steel, etc.
7. Why does the pogopin break?
A: As the pitch decreases, the pogopin needle diameter also becomes smaller, which increases the risk of the probe breaking.
8. Why does the Pogopin get stuck?
A: This is because the Pogopin itself has a multi-accessory structure with many contact points, which can easily cause problems such as unstable contact and low impedance consistency;
The pin stuck problem is caused by many reasons, including but not limited to:
①.The spring pin may be contaminated during welding due to the lack of flux or the flux is not cleaned after welding.
②.The force direction is wrong, causing the needle tip and needle tube to deform.
③.The compression amount of the spring ejector connector is not appropriate. Pressing too little or too much may cause the pin to be stuck.
④.Structural design problems of the needle tube and the needle.
⑤.Surface electroplating process problems.
⑥.Assembly process problems, such as accidentally hitting the tube mouth.
⑦.Roughness of the tube wall.
⑧.Working stroke problems.
⑨.The battery contact paired with the spring ejector is dirty or oxidized, or it touches the plastic fence during use.
9. What is the reason for the poor contact of the Pogo pin?
①. The plastic fence is touched during use.
②. The battery contact or FPC gold finger paired with the pogo pin is dirty or oxidized.
③. The compression of the spring pin connector is too small or too large, resulting in insufficient positive force or damage to the pipe mouth.
④. The wrong force direction causes damage to the appearance of the pogo pin.
10. What should be paid attention to during the assembly of Pogo pin?
①. Ensure that the compression of pogo pin is about 2/3 of the total stroke to avoid impedance instability or nozzle damage.
②. Pay attention to the contact direction to affect the contact area and contact force, and thus affect the contact resistance.
③. The contact surface paired with pogo pin should not be dirty or oxidized.
④. Avoid touching the plastic fence during assembly and use to avoid affecting the durability and stability of pogo pin.
11. What will happen if the rivet nut stroke is unreasonable?
A: If the stroke of the rivet nut gun is not set correctly, the rivet nut will not deform correctly, which will affect the fastening effect. The correct stroke setting is the key to ensure that the rivet nut can deform correctly;
12. What problems will occur if the workpiece plate thickness does not match the rivet nut?
A: If the thickness of the product workpiece plate does not match the rivet nut, the rivet nut will not deform correctly.
13. What are the reasons for cracks in magnets?
A: The main reasons for cracks in ferrite magnets include excessive mechanical stress, temperature changes, shock or vibration, improper processing or handling, material quality problems, over-magnetization, etc. These factors may cause cracks in ferrite magnets during processing or use, thus affecting their performance and reliability;
14. Why do magnets lose their magnetism/weaken their magnetism?
A: Reasons why magnets lose their magnetism or lose their magnetism include high temperature, improper storage, corrosion and oxidation, collision with other objects, exposure to conflicting magnetic fields, and volume loss. High temperature is one of the main causes of demagnetization, because increased temperature causes increased atomic movement, which overwhelms the arrangement of magnetic domains. In addition, factors such as how the magnet is stored, the quality of the material, and whether it is exposed to external magnetic fields can also affect its magnetism;
15. How to restore magnetism of magnets?
A: When faced with the problem of weakened magnetism of magnets, you can restore magnetism by re-magnetizing, applying current, tapping, etc. Placing the magnet in a stronger magnetic field, generating a magnetic field through a coil, or fixing the magnet in a vise and gently tapping one end of the magnet with a mallet can sometimes partially restore its magnetism. In addition, avoiding high temperature and impact is also an important measure to maintain the magnetism of magnets;
16. What is the reason for the spring to break?
1). The mandrel size is too small or the spring is used horizontally, resulting in wear and fracture with the mandrel.
2). The axis size is not suitable, the assembly surface is uneven, or the parallelism of the positioning surfaces at both ends is not good, which causes the spring to deform during compression and produce high-pressure cracks.
3). The mandrel is too short and the end is not chamfered, which increases the friction and wear between the spring and the mandrel, thereby increasing the risk of fracture.
4). There are foreign objects between the spring coil and the coil, which reduces the actual effective number of windings and makes the spring more likely to break under high stress.
5). The spring is used beyond the maximum compression amount, resulting in fracture under high stress.
6). The uniformity of the spring material is poor or the content of the magazine exceeds the standard, resulting in stress concentration and causing fracture.
7). The winding method, corrosion, high hardness or excessive pressing of the spring reduce its tensile and compressive strength, resulting in fracture.
17. What is PRESS-FIT?
A: Press fit is a solderless connection technology widely used in many fields such as automobiles, new energy, energy storage, electrical appliances, and automation equipment. This technology uses mechanical force to press the pins of components directly into the through holes of the printed circuit board (PCB). The interference fit and mechanical locking effect between the pins and the PCB holes form a tight mechanical connection, thereby achieving electromechanical interconnection.
18.What are the advantages of PRESS-FIT?
1). Press-Fit creates electromechanical interconnection without soldering, which can quickly install terminal connectors on PCB modules. The elimination of soldering process not only reduces connection impedance, but also further reduces production costs and assembly time.
2). No heating is required during the crimping process, so no thermal stress will be generated on the PCB board and components, which is beneficial to protect sensitive components and circuit structures, and to a certain extent avoids problems caused by welding such as tin whiskers, cracking, and non-wetting, improves the reliability and stability of the connection, and has the lowest Failures In Time.
3). The Press-Fit installation process allows the product to have low resistance and lower heat generation during use. No other technology can have a current transmission capacity of up to hundreds of amperes in the same time and environment.
19. How to install the PRESS-FIT process?
1). Fix the press (to prevent the press from shifting)
2). Fix the PCB board fixture (to position the PCB board and support the PCB board to prevent deformation during installation)
3). Insert the PCB board and terminal connector
4). Start the press and press vertically at an installation speed of 100-250 mm/min
5). Remove the PCB board and the installation is complete
20. What do load min and load max mean?
A: Load min indicates the initial load value, and load max indicates the load value when the ball head is pressed to the maximum limit.
21. What is the difference between a ball plunger and a spring plunger?
A： The head of a ball plunger is a steel ball, and the stroke is the displacement of the steel ball part. The front part of a spring plunger is a pin-shaped one, and the temporary positioning and indexing of the workpiece can be achieved through the displacement stroke of the pin.
22. There is not enough space to install and remove the spring plunger in the mold. Is there a suitable model to recommend?
A: Short spring plungers LPJLS, LPJFW, or hexagonal pin spring plungers LPJLR, LPJHR are recommended.
23. Can the knob plunger withstand radial force?
A: It is not recommended that the knob plunger withstand radial cutting force, which may easily cause product damage and breakage. Generally, it can only withstand axial force.
24. Compared with the coarse thread type, what are the characteristics of the fine thread type?
A: The fine thread type is suitable for environments where the ejection amount of the pin is finely adjusted. Compared with the coarse thread type, more precise positioning can be achieved.
25. What is the difference between reset type and self-locking type knob plunger?
A: For the self-locking type, you can pull out the knob and rotate it 90° to lock the front end, and keep it pulled out and rotate it 90° to unlock it.
26. Can screws and bolts reach performance level 8.8?
A: Yes, we can achieve 4.8, 6.8, 8.8, 9.8, 10.9, 12.9 for different materials.
27. What are the main types of bolts according to the type of thread?
A: Metric coarse thread, metric fine thread, metric coarse thread (left-handed), unified thread coarse thread UNC and pipe screw type.
28. What are the main types of bolt surface treatment on the market?
A: No surface treatment, blackening treatment, chemical nickel plating, chromate gloss treatment (trivalent), glossy zinc plating, zinc plating, chrome plating, nickel plating, anodizing treatment (white), Dacromet treatment, GEOMET treatment, copper plating, tin plating, anti-loosening agent coating, black spraying.