CHARACTERISTICS OF ALUMINUM ALLOY FORGING PROCESS

Aluminum alloy has begun to be used more and more in the electric vehicle industry. At the same time, aluminum alloy material is also the most widely used metal in all walks of life. The output of aluminum alloy is second only to steel. Aluminum alloys generally have processes such as casting, forging and die casting in the industry.

Different processes meet different application requirements. Among them, aluminum alloy forging has a series of excellent characteristics. After forging, the metal structure of the aluminum alloy can be changed, and the performance of the aluminum alloy can be effectively improved.

CHARACTERISTICS OF ALUMINUM ALLOY FORGING

First of all, the internal organization is fine, uniform and defect-free, and its reliability is far away. It can be processed into high-precision forging with complex shapes, and the machining allowance is small, only about 20% of the machining allowance of the aluminum alloy drawing thick plate, which greatly saves man-hours and costs. Second, the thermal conductivity is good.

The forging temperature range is narrow, and the requirements for the forging temperature are always strict. The performance characteristics of heating die forging are that the aluminum alloy does not produce allotropic transformation. It mainly depends on the correct control of the forging mechanical parameters to improve the metal structure, so that the metal streamline is uniformly and continuously distributed along the forging shape. to improve mechanical properties.

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Details can be accessed by clicking here:https://www.gold-emperor.com/aluminum-alloy-forging-process/

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Maintenance of hydraulic excavator slewing bearing

Hydraulic excavators generally use single-row four-point contact ball-type internal gear slewing bearings. During the excavator operation, the excavator slewing bearing bears complex loads such as axial force, radial force and tipping moment, and its reasonable maintenance is very important. The maintenance of the excavator slewing bearing mainly includes the lubrication and cleaning of the raceway and the inner gear ring, the maintenance of the inner and outer oil seals, and the maintenance of the fastening bolts. Now from these seven aspects will be described in detail.

1. Lubrication of raceways

Slewing bearing rolling elements and raceways are easy to damage and fail, and their failure rate is high. During the use of the excavator, adding grease to the raceway can reduce the friction and wear among the rolling elements, the raceway and the spacer. The space of the raceway cavity is small, and the resistance to filling grease is large, so manual filling with a manual grease gun is required. The lubricating oil nozzles of the slewing bearing raceway are generally distributed at the position of the outer wall of the slewing bearing.

The raceway cavity is generally lubricated with 2# file-based grease, and the grease filling cycle is generally 100h. Under special working conditions such as high dust, high temperature, and continuous operation, the filling cycle should be appropriately shortened. When adding grease, it is necessary to rotate the slewing bearing, and add it about once every 15°~25°. When filling, pay attention to observe the outer sealing ring of the slewing bearing. When you see grease seeping out from the outer sealing ring, stop filling.

When the raceway cavity is filled with grease, bad filling methods such as “refueling in static state” and “single-point oiling” should be avoided, because the above-mentioned bad filling methods will cause local oil leakage of the slewing bearing, and even cause the oil seal of the slewing bearing to become permanent. Damaged, resulting in grease loss, impurity intrusion, and accelerated raceway wear. Be careful not to mix different types of grease to avoid premature failure.

When replacing the seriously deteriorated grease in the raceway of the slewing bearing, the slewing bearing should be rotated slowly and uniformly while filling, so that the grease can be filled evenly in the raceway. This process can not be rushed, it needs to be done step by step to complete the metabolism of grease.

excavator slewing bearing

2. Maintenance of the gear meshing area

Open the metal cover on the base of the slewing platform to observe the lubrication and wear of the ring gear of the slewing bearing and the pinion of the slewing motor reducer. A rubber pad should be placed under the metal cover and fastened with bolts. If the bolts are loose or the rubber gasket fails, water will seep from the metal cover into the lubricating cavity (oil collecting pan) of the rotating inner gear ring, causing premature failure of the grease, reduced lubrication effect, and increased gear wear and corrosion.

The method of replacing the grease in the lubricating cavity of the ring gear is as follows: first, use the working device to support the excavator, and the operator goes under the crawler frame of the excavator and opens the metal cover; secondly, drop the excavator to the ground and start the excavator Do the rotating action for about 10 laps, and the failed grease can be exhausted. The lubricating cavity of the ring gear of the slewing bearing is also filled with 2# file base grease. The replacement cycle is generally 2000h, and the filling amount should be determined according to the model of the excavator.

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Details can be accessed by clicking here:https://www.excavatorbearing.com/a/bearing-knowledge/maintenance-of-excavator-slewing-bearing.html

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Analysis of Preloading Method of High Precision Crossed Roller Bearings

The preload of the crossed roller bearing means that after the bearing is installed on the bearing seat and the shaft, certain measures are taken to produce a quantitative pre-deformation between the rolling elements in the bearing and the inner and outer rings, so as to keep the inner and outer rings in the same position. pressed state. The purpose of preloading the crossed roller bearing is to: increase the rigidity of the support; reduce vibration and noise; prevent the sliding of the rolling elements relative to the inner and outer raceways caused by the moment of inertia. Depending on the application, the bearing arrangement must have a positive or negative operating clearance. In most cases, the working clearance is positive, that is, when the bearing is running, there is a certain residual clearance, although it may be a small clearance.

On the other hand, there are many applications that require negative operating clearance—that is, negative preload—to increase the rigidity or rotational accuracy of the bearing arrangement. For example, spindle bearings of machine tools, CNC machine tool turntable bearings, thin-walled cross-roller bearings of robot arms, pinion bearings in automobile transmission shafts, small motor bearings, or bearing arrangements for reciprocating motion, etc. In some applications, if the imported bearing is under no or only small load, and operates at high speed, preload should be carried out on the bearing arrangement, such as by spring to carry out bearing preload. In this case, the role of preload is to provide a small load to the bearing to prevent the rolling elements from sliding and causing damage to the imported bearing.

crossed roller bearing

So what are the preload forms of the bearing?

The preload form can be radial or axial according to different bearing types. For example, cylindrical roller bearings, due to their design, can only be preloaded in the radial direction, while thrust ball bearings and thrust cylindrical roller bearings can only be preloaded in the axial direction. Single row angular contact ball bearings and tapered roller bearings are generally axially preloaded and are usually paired with another imported bearing of the same type back-to-back or face-to-face. And deep groove ball bearings are usually also subjected to axial preloading. In order to achieve the purpose of preloading, a radial internal clearance larger than that of the ordinary group should be used, so that it can have a larger than zero clearance like an angular contact ball bearing. Contact angle.

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Details can be accessed by clicking here:https://www.prsbearings.com/a/news/crossed-roller-bearing-preload-method.html

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How to overhaul the main parts of the tractor clutch

The overhaul of the tractor is inseparable from the overhaul of the clutch components. In order to improve the maintenance quality of the tractor, the overhaul methods and standards of the main components of the tractor clutch are introduced in detail.

The tractor clutch is composed of four parts: the active part, the driven part, the pressing mechanism and the operating mechanism. The main component of the active part is the driving disc; the main component of the driven part refers to the driven disc with friction linings riveted on both sides; the main components of the pressing mechanism are the pressing spring, pressing lever, and pressing rod bracket; The main components are separation lever, separation bearing, etc. The following tractor clutch manufacturers talk about the maintenance of the main components of the tractor clutch based on actual experience.

Overhaul of drive and driven discs

The main damage of the active disk is wear, scratches, burns and cracks on the friction surface; warpage and deformation of the friction surface. When the thickness of the active disc is 18±0.1 mm, the surface groove depth exceeds 0.50 mm, the arch deformation exceeds 0.30 mm, and the flatness tolerance exceeds 0.12 mm, it should be ground or flat. However, after polishing, its thickness is not less than 16±0.40 mm. If the active disk is cracked or too thin, it should be replaced with a new one.

The driven disc is the most vulnerable part of the clutch. The main damage is wear, hardening, burns, cracks on the surface of the friction plate, oil stains on the surface (dry type), loose friction plate, warping and deformation of the driven disc, fracture of the steel plate, loose riveting between the steel plate and the disc, spline holes wear, etc. It can be determined by measuring the depth of the rivet head with a vernier caliper. The burial depth of the rivet head shall not be less than 0.3 mm, otherwise, use a new friction plate. If the friction plate is seriously worn or there are more than two cracks and fall off, and the burnt surface is large and deep, the new plate should be riveted again. If there is a slight oil stain on the friction plate, it can be burned off with the flame of a blowtorch, or cleaned with gasoline, and the slight burnt surface can be polished with sandpaper.

When replacing the new piece to remove the old piece, use a drill bit 0.40-0.50 mm smaller than the diameter of the old rivet to drill out the rivet head, and then gently punch out the old rivet and remove the old piece. Use a wire brush to remove dust and rust from the driven disc, and check other parts of the driven disc. The warpage of the driven disc steel plate will cause the clutch to vibrate and wear unevenly when starting, so its warpage should be checked. The warpage of the driven disc steel sheet is also called circular runout or yaw. It can be installed on the inspection frame and measured at the outermost edge of the driven disc with a dial indicator. The circular runout limit is 0.80 mm. If it exceeds the limit, it can be calibrated by cold pressing with a special clamp;

13-Inch-(2)

Repair of elastic push rods

The main damage of the elastic push rod is the weakening of the elastic force, the reduction of the hole center distance, the wear of the support hole, and the breakage of the elastic push rod. After the elastic force of the elastic push rod is reduced, it is heated to 780 ~ 810 ° C, quenched in oil, and then heated to 450 ~ 475 ° C for tempering.

When the center-to-center distance of the elastic push rod becomes smaller, the original center-to-center distance can be restored by thermal deformation method. between the mouth. Increase the center distance of the holes, and then perform quenching and tempering according to the above method. When the center distance of the pin holes is enlarged, care should be taken to make the center lines of the two pin holes parallel. When the fitting clearance of the pin hole of the elastic push rod is greater than 0.50 mm, it can be repaired by the maintenance dimension method. The maintenance size can be increased by 1 mm, and the fitting clearance between the pin and the hole is 0.12 mm.

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Details can be accessed by clicking here：https://www.syclutch.com/news/overhaul-of-the-main-parts-of-the-clutch.html

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What are the misunderstandings in the purchase of compact racks?

Compared with other single products, the compact rack is a systematic project and also includes many service elements. Most customers buy for several years, maybe once every ten years, and it is not by people when they buy. There are inevitably many misunderstandings when buying dense racks. Let’s take a look~

Misunderstandings in choosing a compact rack

Mobile shelving

1. Too much emphasis on low prices and not on the quality of dense racks

Regardless of whether you choose a smart or manual compactor, at the same price point, you need to know which file compactor to choose. Price is often closely related to cost. Low-cost dense racks are not very good in appearance and design due to their low cost and poor quality. Experienced buyers understand that if you buy low-priced items, there are often many unpredictable security risks that cause many problems.

2. Choose the type of file rack at will

When building archives, you must consume rationally, and what suits you is the best. Because you don’t know the types of file racks, and you don’t know which product rack is suitable for you, it is recommended to choose carefully.

If you want your file management to be simpler, more technological and intelligent, and if you have enough money, you can buy a smart shelf. In the manufacturing process, the intelligent shelf is more integrated into the intelligent file management system, with intelligent voice control, security protection, sound and light positioning, and rapid retrieval of file information.

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Details can be accessed by clicking here:https://www.etegreen.com/blog/misunderstandings-in-the-purchase-of-compact-racks/

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What are the application ranges and functions of valve bags?

The valve bag made by the bottom paste machine has the characteristics of good moisture resistance, reasonable cost and high production efficiency. It is suitable for the packaging of various powdery colloidal products. effect.

Application scope of valve bag

1. Industrial aspects

It is a powder product packaging for building materials powder, chemical raw materials, pharmaceutical additives, cement, quartz sand, cellulose, polyvinyl alcohol, dispersible latex powder and other materials. Due to the particularity of the product, the packaging bag must meet the requirements of moisture-proof, moisture-proof, dust-proof, easy to stack, not easy to slip, not easy to damage, impact resistance and so on!

2. Agricultural products

The valve bag is an ideal packaging container for powder, granular, flake, flocculent and thick materials such as fertilizers and pesticides used in agricultural production. It is widely used in industrial and agricultural packaging. The valve bag can realize high-speed filling, flexible valve port, neat stacking, strong firmness, no dust leakage, packaging, moisture-proof and moisture-proof. It is a packaging that is particularly popular and widely used by businesses. The use of the packaging bag saves production time and reduces labor costs for enterprises.

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Details can be accessed by clicking here:https://www.lyhuatianm.com/products-information/application-range-of-valve-bag.html

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INTRODUCTION TO THE ROLE OF CALCIUM HYDROXIDE

Calcium hydroxide, commonly known as hydrated lime, is a white powdery solid. The products produced by the professional calcium hydroxide production line are mainly used for rescue equipment such as compressed oxygen self-rescuers and positive pressure oxygen respirators, which are used to absorb carbon dioxide exhaled by miners.

CALCIUM HYDROXIDE PRODUCT INDEX

1. Whiteness: >90 degrees;

2. Fineness: >325 meshes;

3. Calcium content: >95%;

4. Moisture content: <2%.

ADVANTAGES OF CALCIUM HYDROXIDE

1. The whiteness is clear blue and white, and the appearance is good;

2. No impurities exist, high purity;

3. Good solubility, no precipitation, the solution will drop after being placed for more than a month and shake gently;

4. It is smooth after soaking in water and has good construction, which is beyond the reach of ash calcium produced in other places.

CALCIUM HYDROXIDE USE

calcium hydroxide

The specific application of calcium hydroxide sewage treatment

1. It can neutralize free acid in wastewater and acid salt in wastewater.

2. In wastewater, where hydroxide ions can react with metal ions to produce water-insoluble precipitates.

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Details can be accessed by clicking here:https://www.ly-gaifeng.com/blog/calcium-hydroxide-action.html

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Precautions for installation, commissioning and maintenance of linear vibrating screen

Linear vibrating screen structure and functional description of each part, linear vibrating screen is mainly composed of screen box, screen frame, screen mesh, vibrating motor, motor base, vibration damping spring, bracket, etc. The following vibrating screen manufacturers will introduce each linear vibrating screen in detail Parts composition, installation, use and maintenance work.

Structural composition of linear vibrating screen

1. Screen box: It is welded by several steel plates of different thicknesses. It has certain strength and rigidity and is the main part of the screening machine.

2. Screen frame: made of pine or wood with small deformation, it is mainly used to keep the screen flat and achieve normal screening.

3. Screen: There are several kinds of screens such as low carbon steel, brass, bronze, stainless steel wire.

4. Vibration motor (please refer to the vibration motor operation manual for operation and maintenance methods).

5. Motor base: install the vibration motor. Before use, the connecting screw must be tightened, especially three days before the trial of the new mesh screen machine, it must be tightened repeatedly to avoid accidents caused by loosening.

6. Damping spring: prevent vibration from being transmitted to the ground and support the overall weight of the screen box. When installed, the spring must be perpendicular to the ground.

7. Support: It consists of four columns and two channel steels to support the screen box. When installing, the columns must be perpendicular to the ground, and the channels under the two columns should be parallel to each other.

Linear Vibrating Screen

Preparations for installing linear vibrating screen

1. Check whether the motor logo meets the requirements.

2. Measure the insulation resistance with a 500-volt megger, and dry the stator winding at a temperature not exceeding 120.

3. Check the motor fasteners and beware of loosening.

4. Check whether the motor surface is damaged or deformed.

5. Check whether the rotation is flexible. If there is any abnormality, it should be excluded.

6. Check whether the power supply is out of phase, and run for 5 minutes with no load.

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Details can be accessed by clicking here:https://www.hsd-industry.com/news/linear-vibrating-screen-installation/

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What are the types of belt conveyor idlers?

The idler is an important part of the belt conveyor . If there is a problem with the idler, it will definitely affect the life of the belt conveyor . Since the idler is so important, the conveyor manufacturer will share with you what are the types of belt conveyor idlers?

1. Groove upper idler

The standard groove angle of the grooved idler is 35°, so the 35° grooved idler and the 35° grooved forward-tilt idler are mostly used in a conveyor, and in the selection of these two types of idlers There are three forms, namely full forward tilt and partial forward tilt (one set of forward tilt rollers in every 5 sets of upper rollers) and no forward tilt rollers. At present, the first two types of idlers are relatively common. Of course, there are 45-degree grooved idlers and 45-degree grooved forward-tilt idlers.

2. Buffer roller

Common buffer idlers have 35-degree and 45-degree grooved idlers. Under normal circumstances, if you are using a cotton fabric core conveyor belt, you can only use a 35-degree grooved buffer idler. The 45-degree grooved buffer idler can be used in the section where the guide groove is not impacted by the material.

3. Transition roller

Screw conveyor

4. Return roller

The standard style of the return idler is still the parallel lower idler, and it is also the lower idler that is used more at present. In addition, the parallel lower idler has two forms: single-roller type and double-roller type. As for which one to use, the designer should choose according to the bearing capacity of the idler. And according to the research, it is found that making the lower idler into a two-roller V-shape has a certain effect on preventing the deviation of the lower branch of the conveyor belt, especially the V-shaped forward tilting lower idler has a more obvious anti-deviation effect.

5. Comb roller

Comb rollers are not used in many places, and most of them are used in conveyors specially designed for conveying viscous materials.

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Details can be accessed by clicking here:https://www.zymining.com/blog/types-of-belt-conveyor-idlers.html

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What are the considerations for choosing a oil tank truck?

In fact, refueling trucks, oil trucks, and oil tank trucks have a collective name: tank trucks, but each place is called differently, and the requirements for registration are also different.

The current oil tank trucks are divided into: Dongfeng brand oil tank truck, Jiefang brand oil tank truck, Foton Omark oil tank truck (high-end brand), Foton oil tank truck (the most fuel-efficient model), Jianghuai brand oil tank truck. Also There are heavy trucks, Shaanxi oil tank truck, etc…

According to the tonnage, tank trucks are divided into: blue card 2-ton small tanker, yellow card 5-ton tanker (the most commonly used and cost-effective), 8-ton tanker, 10-ton tanker, 12-ton tanker (single-axle large truck) Tonnage), 15-ton, 20-ton oil tanker (small 3-axle, rear double axle), 25-ton 30-ton tank trucks (front four and rear eight), 40-ton semi-trailer tanker.

oil tank truck

According to the material of the tank, the tanker is divided into: carbon steel tanker (easy to rust), stainless steel tanker (higher cost, anti-corrosion, clean, low tank loss), aluminum alloy tanker (the weight of the tanker Light, anti-corrosion, hygienic, high tank strength). The editor explained it this way, you should know how to choose a tanker that suits you, but you must pay attention to the following aspects in the selection process.

1. Oil tank trucks will encounter many emergencies in the process of oil transportation and refueling. The safety of oil tankers is particularly important when accidents occur. In recent years, oil tanker accidents have emerged one after another. On the one hand, it is due to improper operation and negligence of personnel, and on the other hand, it is related to the car itself. Good products can minimize the loss of accidents.

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Details can be accessed by clicking here:https://www.ly-cimc-linyu.com/a/news/precautions-for-the-selection-of-oil-tank-truck.html

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