WHAT ARE THE EFFECTS OF FORGING PROCESS ON FORGINGS?

In forging production, in addition to ensuring the required shape and size of the forging, it must also meet the performance requirements put forward during the use of the parts, which mainly include: strength index, plastic index, impact toughness, fatigue strength, fracture initial and Stress corrosion resistance, etc. For parts working at high temperature, there are also high temperature instantaneous tensile properties, durable properties, anti-deformation properties and thermal fatigue properties.

INFLUENCE OF FORGING ON METAL MICROSTRUCTURE AND PROPERTIES

The raw materials for forging are ingots, rolled products, extruded products and forging billets. Rolled material, extruded material and forging billet are semi-finished products formed by rolling, extruding and forging of ingots respectively. In forging production, using reasonable process and process parameters, the structure and properties of raw materials can be improved through the following aspects:

1. Break the columnar crystals, improve the macrosegregation, change the as-cast structure to the forged structure, and weld the internal pores under suitable temperature and stress conditions to improve the density of the material;

2. The ingot is forged to form a fibrous structure, and further through rolling, extrusion and die forging, the forgings can obtain a reasonable distribution of fiber directions;

3. Control the size and uniformity of grains;

4. Improve the distribution of the second phase (for example: alloy carbides in ledeburite steel);

5. To make the organization get deformation strengthening or deformation strengthening, etc.

Due to the improvement of the above structure, the plasticity, impact toughness, fatigue strength and durability of the forgings are also improved, and then the required hardness, strength and plasticity of the parts can be obtained through the final heat treatment of the parts. performance.

However, if the quality of the raw materials is poor or the forging process used is unreasonable, forging defects may occur, including surface defects, internal defects or unqualified performance.

Other agricultural machinery forgings

INFLUENCE OF RAW MATERIALS ON THE QUALITY OF FORGINGS

The good quality of raw materials is a prerequisite to ensure the quality of forgings. If the raw materials are defective, it will affect the forming process of the forgings and the final quality of the forgings.

If the chemical elements of the raw materials exceed the specified range or the content of impurity elements is too high, it will have a greater impact on the forming and quality of the forgings. Appears hot and crisp. In order to obtain intrinsically fine-grained steel, the residual aluminum content in the steel needs to be controlled within a certain range, such as 0.02% to 0.04% (mass fraction) of A1 acid. If the content is too small, it will not be able to control the grain size, and it is easy to make the essential grain size of the forgings unqualified; if the aluminum content is too much, it is easy to form wood grain fractures under the condition of forming fibrous structure during pressure processing. Tear-shaped fractures, etc. For another example, in austenitic stainless steel, the more n, Si, Al, and Mo are contained, the more anionite phase, the easier it is to form band cracks during forging, and make the parts magnetic.

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Details can be accessed by clicking here:https://www.gold-emperor.com/influence-of-forging-process-on-forgings/

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How to maintain the excavator slewing bearing?

The excavator slewing mechanism includes the following parts: slewing motor, reducer, slewing large ring gear, slewing center section and other components. In the daily operation, the daily maintenance of the excavator slewing mechanism should be done well, especially the excavator slewing bearing, otherwise the work efficiency of the excavator will be seriously affected.

Excavator slewing bearing maintenance

Under normal working conditions (working 8 hours a day), the slewing bearing is lubricated once every 100 hours of operation. Before filling the grease nipple or connecting pipe, remove the plastic plug or screw plug from the oil hole.

Lubricate once a week in tropical, humid, dusty, temperature-variable areas and in continuous operation. New grease must also be added before and after the machine has been stopped for a long time. The raceways must be filled with grease each time they are lubricated until a new oil ring is formed at the seal. When injecting grease, turn the slewing bearing slowly so that the grease is filled evenly.

When the excavator runs abnormally (flooded by water, running in mud for a long time, etc.), the slewing bearing should be maintained: inject the required amount of grease for the slewing bearing for the first time, and then inject half the amount every day for a week. The tooth surface should be cleaned of debris every ten days and coated with grease.

Excavator slewing bearing

Note: Because there are many factors in the comprehensive working conditions, users can choose the best original grease according to their specific requirements.

The hydraulic oil maintenance of the rotary motor can be maintained at the same time as the entire hydraulic system, and the hydraulic oil needs to be replaced every 2000 hours. The gear oil of the rotary reducer needs to be replaced once every 1000 hours.

In daily operation, we need to observe the liquid level of the gear oil of the rotary reducer from the dipstick. In some cases, abnormal loss of lubricating oil will be found. We need to open the observation port of the large ring gear (the bottom of the boom cylinder, the grease filling port) , check whether the lubricating oil leaks into the large ring gear cavity through the sealing ring of the rotary reducer.

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

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Crossed Roller Bearing Installation Process

There are two types of crossed roller bearings, one is crossed cylindrical roller bearings, the other is crossed tapered roller bearings; crossed roller bearings have a long history of application outside, but only in recent years. Into the public’s vision, it is widely used due to its own uniqueness and incomparable advantages over other bearings. Many users will have some problems with the installation of crossed roller bearings, such as lubrication, installation, cleaning, etc. Today, I will explain to you, I hope it will be helpful to you.

Preparation before installation

1. Choose grease

Lubrication has an important influence on the operation and life of crossed roller bearings. Here is a brief introduction to the general principles of selecting grease. Grease is made of base oil, thickener and additives. Different types of greases with the same type and different grades have very different performances and different allowable rotation limits. Be careful when selecting them. The performance of lubricating grease is mainly determined by the base oil. Generally, the low viscosity base oil is suitable for low temperature and high speed, and the high viscosity base oil is suitable for high temperature and high load.

The thickener is also related to the lubricating performance, and the water resistance of the thickener determines the water resistance of the grease. In principle, different greases cannot be mixed, and even greases with the same thickener will have adverse effects on each other due to different additives.

2. Cleaning before bearing installation

The bearing surface is coated with anti-rust oil, you must carefully clean it with clean gasoline or kerosene, and then apply clean high-quality or high-speed high-temperature lubricating grease before installation and use. The impact of cleanliness on rolling bearing life and vibration noise is very large. But we don’t want to remind you that closed bearings do not need to be cleaned and refueled.

Bearing installation

1. Thoroughly clean the main shaft, bearing seat or other installation parts, remove oil or impurities, and confirm whether there are burrs or burrs.

2. Install the crossed roller bearing into the shaft or bearing seat: Because it is a thin-walled bearing, it is easy to tilt when it is installed. In order to prevent this phenomenon, please use a plastic hammer to strike evenly while keeping it level, and carefully install the crossed roller bearing into the bearing housing or on the shaft until it is confirmed by sound that the reference surface is not completely close. Do not directly hammer the crossed roller bearing surface and the non-stressed surface. Use pressure blocks, sleeves or other installation tools (tools) to make the bearing evenly stressed, and do not install it through the transmission force of rolling elements.

If the mounting surface is lubricated, the installation will be smoother. If the interference is large, the bearing should be heated to 80~90℃ in mineral oil and installed as soon as possible, and the oil temperature should be strictly controlled not to exceed 100℃ to prevent the reduction of hardness due to tempering and the influence of dimensional recovery. When it is difficult to disassemble, it is recommended that you use the disassembly tool to pull out and pour hot oil on the inner ring carefully. The heat will expand the inner ring of the rolling bearing, making it easier to fall off.

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

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Troubleshooting the Steering Clutch of a Track Tractor

Most of the steering mechanisms of crawler tractors are steering clutches. When the tractor is performing deep soil preparation or sowing operations, failures such as slippage of the steering clutch, incomplete separation or inability to separate the locomotive often occur, resulting in difficulty in steering and deviation of the locomotive, which not only affects the work, but also wastes power and increases operating costs. In this case, it is necessary to find out the reasons in time to eliminate them, so as not to affect the normal operation of the locomotive. The common tractor steering clutch failures mainly include the following.

Clutch slip

The clutch slips and the forward speed of the tractor is reduced. When the steering lever on one side is pulled to control the steering, the steering clutch on the other side is swept away, the tractor cannot be steered, and makes a “click, click” sound, the operation is difficult, the work efficiency is reduced, and the steering clutch is burned.

Reason

(1) Cultivated land is often a partial traction operation. In order to prevent the right crawler from falling into the furrow, the driver often turns the left steering rod, which causes the early wear of the left friction plate, the wear of the friction plate becomes thinner, and the passive plate Exposed rivets.

(2) The foot brake is used before the steering clutch is completely separated, or the steering clutch is engaged before the brake is released, resulting in an increase in the strength of the inner and outer springs of the steering clutch and insufficient spring compression force.

(3) The clutch enters the oil, leaks into the gear oil from the central drive or the final drive, and leaks into the grease and diesel oil from the oil tank.

(4) The joystick has no free travel, the tractor is operated unreasonably, and the locomotive is overloaded for a long time.

Method of exclusion

Check the joystick and check it every 50-60 hours. Don’t use too much force when pulling the steering lever, and release it quickly and steadily.

If oil is found to stick to the driving piece and the driven piece, it should be cleaned with a metal cleaner. The cleaning work is best done immediately after the work is finished, because the driving piece and the driven piece are very hot at this time, and the oil is easy to wash off.

At the end of each shift, the oil drain plug of the isolation room should be opened, the leaked gear oil should be released, and the cause of the oil leakage should be checked.

12 Inch 26 Spline

Steering clutch not fully disengaged

The effective stroke of the joystick is too small. Although the joystick is pulled hard when turning, it still cannot reach the full stroke, which makes it difficult for the tractor to turn.

Reason

(1) The total thickness of the steering clutch friction plate (the size from the active drum to the pressure plate after assembly) is too large, and the pressure plate and the release bearing are close to the partition. When the steering clutch is disengaged, the disengaging bearing dial quickly touches the partition plate, the control lever cannot be pulled, the effective stroke becomes smaller, and the disengagement is not complete.

(2) Where the steering clutch release fork rod and the two lugs of the release bearing sleeve cooperate, the release fork rod and the fork rod seat are worn. When the joystick is pulled, the fork arm is quickly pressed against the active drum pressure plate (even the pressure plate is ground with groove marks), which makes the joystick stroke smaller and cannot be completely separated.

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Details can be accessed by clicking here:https://www.syclutch.com/news/trouble-of-steering-clutch-of-crawler-tractor.html

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What are the factors that affect the load-bearing of compact racks?

The compact rack is usually used to store the company’s documents, vouchers and archives. Because of its dense storage characteristics, it can improve the utilization of space and has been widely used. Before purchasing a compact racks, many units will first consider its load-bearing problem, what are the factors that affect the load-bearing of the compact racks, and the precautions when using it.

Factors affecting the load-bearing capacity of archives

1. Material quality affects load-bearing

Generally, the raw materials of the compact racks are cold-rolled steel plates, and other key parts are made of national standard steel plates. Therefore, when purchasing, you need to pay attention to whether the raw materials used by the manufacturer meet the standards, and whether the steel plates meet the standards. Only the compact racks that meet the standards and meet the standards can ensure the quality.

2. The structure of the house affects the load-bearing

In addition to the quality of the material that will affect the load-bearing of the compact rack, the floor where it is installed and the structure of the house will also affect the load-bearing. Different house structures and buildings, different floors, the load-bearing will also be different. Therefore, before purchasing, we also need to explain to the manufacturer the floor and house structure where our compact racks are to be stored, so as to facilitate the manufacturer’s evaluation.

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Details can be accessed by clicking here:https://www.etegreen.com/blog/factors-affecting-the-load-bearing-of-compact-racks/

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What is the difference between a valve bag and an open bag?

Open bag and valve bag are two types of packaging bags that are widely used as production product packaging. We often use these two types of packaging bags in our daily life, but many people do not understand how these two types of packaging are used. What is the difference between the production, let’s take a look at the difference between the valve bag and the open bag, and what are the characteristics of the valve bag packaging machine and the open bag packaging machine.

Valve bag

1. Features of valve bags

First of all, we need to understand what type of packaging bag is a valve bag, in order to understand the valve bag packaging machine vividly. As the name implies, there must be a “valve”, and the bag body is sewn up and down, leaving a feeding port for machine filling. (valve). The valve bag is divided into an outer valve bag and an inner valve bag. The principle of the sealing method is: when the goods are filled, the contents will squeeze and seal the valve port from the inside to achieve the purpose of sealing, and the outer valve port will be filled with the material. It needs to be manually folded, and the inner valve bag is automatically sealed after the material is filled.

Relatively speaking, the valve bag packaging is accurate in weighing, more beautiful, easy to stack, and does not need to be re-sealed, which saves manpower and increases production efficiency. The stable buildup on the top makes it safer to transport.

HD100-IB Square Bottom Machine

2. Application fields of valve bags

Widely used to store cement, sand, animal foods, fertilizers, grains, coffee beans, food, powdered and granular commodities, salt, plastic resins and building materials, etc.

3. Valve bag packing machine

For different packaging bags, its packaging machines are naturally divided into valve bag packaging machines and open bag packaging machines. Valve bag packaging machine can also be called valve bag bag making machine. The packaged products are loaded into the bag from the filling port under the action of pneumatic or mechanical power. The valve bag packaging machine is an automatic quantitative packaging machine designed for materials with strong air affinity, low bulk density, good self-flow, or fine powder or ultra-fine powder. It is mainly divided into: impeller packaging machine, pneumatic packaging machine, spiral packaging machine.

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Details can be accessed by clicking here:https://www.lyhuatianm.com/products-information/difference-between-valve-bag-and-open-bag.html

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WHAT ARE THE PRODUCTION SPECIFICATIONS OF CALCIUM HYDROXIDE PRODUCTION LINE

An important application of calcium hydroxide is as a flocculant for water and sewage treatment. It forms fluffy charged solids that help remove smaller particles from the water, resulting in a more transparent product. This application benefits from the low cost and low toxicity of calcium hydroxide. It’s also used in freshwater treatment to raise the pH of the water so that the pipes don’t corrode when the base water is acidic because it’s self-regulating and doesn’t raise the pH too much.

Therefore, we should correctly select the production specifications of calcium hydroxide production line when purchasing equipment, otherwise it will affect the working efficiency of the equipment to a certain extent. So what are the production specifications of calcium hydroxide production line?

GFEX Case

Due to the great demand for calcium hydroxide now, the use of basic calcium hydroxide equipment is also very large. With the use of the equipment, we will gradually diversify the specifications of the equipment according to the output of calcium hydroxide, so as to better Meet the needs of calcium hydroxide manufacturers and reduce some unnecessary investments in calcium hydroxide manufacturers.

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

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How to choose the length and width of the vibrating screen?

When we choose a vibrating screen, we generally pay attention to its model size. If it is used in different industries, the selected model size is also different. For example, if it is used in the mining production industry, then the vibrating screen must be of the heavy-duty type. Relatively speaking, the size of the model is relatively large, and the parameters that determine the size of the vibrating screen to a certain extent are the length and width of the vibrating screen, so how to choose the length and width of the vibrating screen?

Selection of length and width of vibrating screen

Arc vibrating screen

1. Selection of the length of the vibrating screen

The selection of the length of the vibrating screen should be appropriate, because the screening efficiency of the linear vibrating screen is directly related to the length of the linear vibrating screen. If the length is too long, the screened materials will not be able to quickly leave the screen surface and affect the linear vibration. Screening effect. If the length is too short, the residence time of the material on the screen surface is too short, and it cannot be sufficiently screened. It is also unreasonable to increase the screening efficiency by using a longer screen surface to increase the screening time, so the length of the screen surface must be selected appropriately.

2. Selection of the width of the vibrating screen

At present, the width of the vibrating screen is at most 3.6m, and the width of the screen surface of the light-duty linear vibrating screen cannot exceed 1.5m. If the screen surface is too wide, it is difficult to ensure the uniformity of the material on the screen surface. In order to ensure the ability of the linear vibrating screen screening equipment, the material on the screen surface of the linear vibrating screen needs to have a certain thickness. When the thickness of the material on the screen surface reaches a certain level, the amount of the screen surface passing through it mainly depends on the linear vibrating screen. width. Therefore, the larger the production capacity, the wider the screen surface needs to be, but the width of the linear vibrating screen also has a certain limit.

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Details can be accessed by clicking here:https://www.hsd-industry.com/news/how-to-choose-the-length-and-width-of-the-vibrating-screen/

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What are the reasons for the blockage of the briquetting machine?

The briquetting machine has high operation efficiency, which can not only complete the production quickly, but also ensure the quality. In particular, the briquette briquette machine is related to the quality of the product, so it is necessary to eliminate unfavorable factors as much as possible for the working state of the briquette machine. In the long-term operation, the equipment of the briquetting machine will fail, and the briquetting machine may be blocked. What are the reasons for the blockage of the briquetting machine? Let’s take a look together~

Causes of blockage of the briquetting machine

1. The cutting speed is too fast, so that the production speed is lower than the feeding speed, and it is easy to cause blockage.

2. If the temperature of the material is too high, the humidity will be too high. Once the humidity is too high, the viscosity will inevitably increase, so it is easy to cause the briquetting machine to be blocked.

3. The material is doped with larger particles, therefore, the material cannot pass through the roller, resulting in blockage.
4. The speed of the briquetting machine is too slow, and it is difficult to demould the material. Usually, the speed of the briquetting machine should be maintained at about 10 to 20 rpm.

5. Special mold design will also lead to the difficulty of mold release. For example, rectangle and diamond shape are special. Usually, we need oval and round shape, which is convenient for mold release.

6. The management of materials is not in place, mainly because the coordination and communication of employees are not in place, resulting in uneven delivery of materials.

High Pressure Briquetting Machine

Common faults of briquetting machine equipment

1. No ball or no shape

In the use of briquetting machine equipment, sometimes the phenomenon of non-balling and non-forming occurs. The main reasons are insufficient feed, too low hydraulic pressure, soft roll skin quenching, and ball socket deformation. Insufficient feeding will make the briquetting machine without material to press, so add enough material to the briquetting machine; if the hydraulic pressure is too small, the material will not be fully pressurized. At this time, reduce the speed and increase the pressure. The deformation of the ball socket will make the shape of the material uneven, and it should be repaired or replaced in time.

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Details can be accessed by clicking here:https://www.zymining.com/blog/causes-of-blockage-in-the-briquetting-machine.html

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What problems should be paid attention to when purchasing concrete mixer trucks?

Concrete mixer trucks are very common in construction projects. The boom in the real estate industry has accelerated the development of concrete mixer trucks. The market for concrete mixer trucks is getting wider and wider, and more and more users want to buy mixer trucks. What problems should be paid attention to when mixing trucks?

1. Choose the right load

This mainly refers to the choice of tank volume. For example, a mixer truck with a large loading capacity has high transportation efficiency, but the corresponding cost is also high. It is said that the loading capacity of the first four and eight-wheeled mixer trucks is higher than that of the rear eight-wheeled mixer trucks. It is much larger, but the price of the first four and the eight-wheeled mixer is 30%-40% more expensive than that of the latter eight-wheeled mixer. If the construction site you are working on is relatively small and the road is narrow, then choose a smaller mixer; if The construction site you are working on is larger, so choose a larger mixer truck, which has a larger carrying capacity and a relatively higher profit. In short, a suitable mixer truck can do more with less.

Concrete mixer trucks

2. Material selection

The mixer truck is afraid of failure during transportation. If there is a failure during transportation, it will cause concrete to coagulate. If it is serious, the tank may be scrapped, so pay attention to the selection of materials. It is better to choose imported mixer trucks, reducers, hydraulic motors, radiators and other components. If economic conditions permit, small mixer trucks are better to choose imported ones, so that the quality can be guaranteed.

3. Select a reasonable structure design

Reasonable structure design can ensure convenient operation. Concrete residue is easy to accumulate in the mixing tank. After a long time, the effective volume of the tank will be reduced, and it will be more laborious to clean up.

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Details can be accessed by clicking here:https://www.ly-cimc-linyu.com/a/news/precautions-for-the-purchase-of-concrete-mixer-trucks.html

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