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1. Fitter: counterbore, tapping, reaming, drilling. The counterbore angle is generally 120℃, used for pulling rivets, 90℃ used for countersunk screws, and tapping inch bottom holes. 2. Flanging: It is also called hole extraction and hole flanging, which is to draw a slightly larger hole on a smaller base hole and then tap it. It is mainly processed with thinner sheet metal to increase its strength and the number of threads. , To avoid sliding teeth,sheet metal fabrication company generally used for thin plate thickness, normal shallow flanging around the hole, there is basically no change in thickness, and when the thickness is allowed to be thinned by 30-40%, it can be 40-higher than the normal flanging height. For a height of 60%, the maximum flanging height can be obtained when the thinning is 50%. When the thickness of the plate is larger, such as 2.0, 2.5, etc., it can be tapped directly.
3. Punching machine: It is a processing procedure that uses mold forming. Generally, punching processing includes punching, corner cutting, blanking, punching convex hull (bump), punching and tearing, punching, forming and other processing methods. The processing needs to have corresponding processing methods. The mold is used to complete the operations, such as punching and blanking molds, convex molds, tearing molds, punching molds, forming molds, etc. The operation mainly pays attention to position and directionality.
4. Pressure riveting: mainly pressure riveting nuts, screws, and so on. It is operated by hydraulic pressure riveting machine or punching machine, riveting it to sheet metal parts, and also the way of expanding riveting, which needs to pay attention to the directionality.
5. Bending; bending is to fold 2D flat parts into 3D parts. The processing needs to be completed with a folding bed and corresponding bending molds, and it also has a certain bending sequence. The principle is that the next cut does not interfere with the first folding, and the interference will occur after the folding. When the aluminum plate is bent, there are cracks. Increase the slot width of the lower die. Increase the upper die R (annealing can avoid cracks). Interference requires bending first and then pressing, and some processes such as bending-pressing riveting-and then bending.
6. Welding: Welding definition: the distance between the atoms and molecules of the material to be welded and the Jingda lattice is integrated into one category: a Fusion welding: argon arc welding, CO2 welding, gas welding, manual welding b Pressure welding: spot welding, butt welding, bump welding c Brazing: electric chromium welding, copper wire
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Forging is more tough, and it is used more in places subject to torque, such as the steering arm of a car. Castings are metal molded objects obtained by various casting methods, that is, smelted liquid metal is poured into a pre-prepared mold by pouring, injection, inhalation or other casting methods, and after cooling, the obtained Objects with a certain shape, size and performance.
Precision forgings are castings obtained by the casting method of precision castings.precision forging Commonly used is investment casting, also known as lost wax casting: select suitable investment materials (such as paraffin) to make investment molds; repeatedly dip refractory coatings on the investment molds Sprinkle the refractory sand process, harden the shell and dry; then melt the internal investment to obtain a cavity; fire the shell to obtain sufficient strength, and burn off the remaining investment material; cast the required metal materials; After solidification, cooling and dehulling, the sand is cleaned to obtain high-precision finished products. According to product needs or heat treatment, cold processing and surface treatment. Investment castings are used in almost all industrial sectors except for aviation and weapons sectors, especially electronics, Petroleum, chemical, energy, transportation, light industry, textile, pharmaceutical, medical equipment, pumps and valves.
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Every family must have plush toys. Plush toys can be used as decorations and comfort toys for children. How should the plush toys be maintained?plush toy supplier
Avoid long-term sunlight and keep the inside and outside of the toy dry.
When cleaning, take necessary measures according to the size of the plush toy. Keep the room clean, dust as little as possible, and clean the surface of the toy with clean, dry, and soft tools frequently.
Small toys can first be covered with tape on the parts that are afraid of wear, and directly put in the washing machine to softly wash, spin dry, hang in a cool place to dry, and intermittently lightly arrange the toys to make the fur and fillings fluffy and soft.
For plush toys or dolls equipped with high-intelligence electronics, movement, and audio, the electronic components (some are not waterproof) or batteries must be removed before cleaning to prevent water damage. Wholesale plush toys, plush toys wholesale
After the cleaned plush toy is dry, use a clean comb or similar tool to comb it neatly in the direction of the fur to make the fur smooth and beautiful.
For large toys, you can find the filling seam, cut the sutures, and take out the filling. Special parts can be omitted (better to maintain the appearance). Use tape to stick the parts that are afraid of wear and tear, and put the toy skin in the washing machine. Wash, spin dry, hang in a cool place to dry, and lightly arrange the toys intermittently to make the fur and fillings fluffy and soft. Then put the stuffing into the skin of the toy, shape it, and sew it.
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Single crystal growth preparation methods can be roughly divided into vapor phase growth, solution growth, hydrothermal growth, molten salt method, and melt method. The most common techniques are the pulling method, the crucible descending method, the zone melting method, the directional solidification method, etc.; the following two common methods are introduced for everyone to know.
1. Volatilization
Principle: Relying on the continuous volatilization of the solution to make the solution from unsaturated to saturated supersaturated state
Conditions: The solid can be dissolved in relatively volatile organic solvents. In theory, all solvents can be used, but generally choose 60～120℃.
Note: Different solvents may cultivate different single crystal structures，boule crystal， Methods: dissolve the solid in the selected organic solvent. Sometimes the solid can be completely dissolved by heating, cooled to room temperature or added with a solvent to make it unsaturated, filtered, and sealed. Stand still and cultivate.
2. Diffusion method
Principle: Use two completely miscible organic solvents with a large difference in boiling point. The solid is easily soluble in high-boiling solvents, but hardly soluble or insoluble in low-boiling solvents. In a sealed container, the low-boiling point solvent is volatilized into the high-boiling point solvent to reduce the solubility of the solid, so as to precipitate crystal nuclei and grow into a single crystal. Liquid etc.
Conditions: The solubility of the solid in hard-to-volatile solvents is large or large, and it is insoluble or hardly soluble in volatile solvents. Experience: The greater the solubility of solids in hard-to-volatile solvents, the better. During cultivation, the solid must be saturated or nearly supersaturated in the high boiling point solvent.
Method: Heat and dissolve the solid in a high-boiling solvent, close to saturation, place it in a sealed container, put a volatile solvent in the sealed container, seal it well, and let it stand for incubation.
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When feeding and managing lactating sows, attention should be paid to the choice of feed. Lactating sows are responsible for the task of providing milk for the piglets. Therefore, during the feeding process, they must provide bran soup, salt water and other foods to replenish their physical strength. At the same time, they can add supplements to the food ，broods of piglets. Helps less limb and hoof disease, less mastitis, shorter heat interval, longer effective reproduction time (more brooding). Better circulation of oxygen, less pressure (higher survival rate). Produce better milk, stronger piglets, and higher survival rates.
Feeding times
Lactating sows have a lot of physical exertion, and they need to continuously increase the number of feedings and the amount of feeding during breeding, so that the daily intake of lactating sows can reach the standard, but in the first three days of weaning, the feed intake should be gradually reduced. quantity.
Disinfection
Lactating sows have low immunity and are prone to diseases at this time. Therefore, during breeding, the pens should be cleaned regularly to clean up the food residues and feces, and then they can be sterilized in the pens for the mothers. Pigs and piglets provide a hygienic growth environment.
environment safety
After the sow enters the lactation period, its nipples and breasts are in a state of swelling, redness and inflammation. At this time, if there are sharp objects in the environment, the sow will be scratched. Therefore, clean the sharp objects in the pen and Laying straw on the ground allows sows and piglets to pass this period of reproduction and growth comfortably.
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In real life, plush toys can not only be given to children, but also girls with bursting hearts like plush toys, but when choosing plush toys for them, they are given to what kind of plush toys to choose. The boys have brought another big difficulty. You can look at，custom plush toys，to customize your own unique creativity and give her unique love.
A person who understands you is the greatest happiness. This person is not necessarily perfect, but he can read you, walk into the depths of your heart, understand everything in your heart, and the person who understands you best will always I'm by your side, silently guarding you, and don't let you suffer a little bit of grievance. People who truly love you won't say many things that love you, but will do many things that love you!
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One-third of life is spent in sleep. The four major indicators for measuring whether people have "healthy sleep" are: adequate sleep, sufficient time, good quality, and high efficiency; easy to fall asleep; continuous sleep without interruption; Deep sleep, waking up, tiredness, etc. mattress wholesale price，The quality of sleep is closely related to the mattress. When choosing a mattress, consumers can choose from the permeability, decompression, support, conformability, bed surface tension, sleep temperature, and sleep humidity of the mattress. Purchase a mattress of the right type and good quality. Since each person's specific situation is different, such as weight, height, fatness and thinness, personal living habits, preferences, etc., people should choose according to their own specific circumstances, local climate and personal economic income conditions when buying mattresses. . One of the most basic requirements is to maintain the lumbar spine physiological lordosis when lying on the back, and the body curve is normal; when lying on the side, the lumbar spine should not bend or bend sideways.
What kind of mattress is best to choose should start from the function of the mattress. The function of the mattress is to ensure that consumers get a healthy and comfortable sleep. There are two criteria for a good mattress: one is that no matter what sleeping position a person is in, the spine can remain straight and stretched; the other is that the pressure is equal, and the whole body can be fully relaxed when lying on it. This involves the softness of the mattress.
The hardness of the mattress depends on the hardness of the inner spring. In addition to the necessary hardness for supporting the spring, the spring should also have good resilience, that is, the so-called combination of rigidity and flexibility. Too hard or too soft, the rebound is not ideal. People lying on a mattress that are too hard only bear the pressure on the four points of the head, back, buttocks, and heels. The other parts of the body are not completely settled. The spine is actually in a state of stiffness and tension, which not only fails to achieve the best rest. Effective, and sleeping on a mattress like this for a long time will damage your health. A mattress that is too soft makes the whole body sunken when lying down, and the spine is bent for a long time, causing pressure on the internal organs. For a long time, it is also unhealthy and uncomfortable. Therefore, a mattress with moderate hardness should be used.
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