Shandong Shengya Machinery Co., Ltd. specializing in the production of various types of brick, brick machine, brick machine, hollow brick, pavement brick and other equipment of the old brick factory.
        Cement brick production of unburned brick molding mold is the key equipment, cement brick mold is good or bad, will directly affect the production out of the unburned shape and yield issues. Cement brick mold is generally what the defect is? What measures need to be taken to reduce or avoid these molds defect?
A cement brick mold surface with a soft spot equipment
After the mold surface with a soft spot heat treatment, it will affect the wear resistance of the mold, reduce mold life.
Reason:
1. mold surface oxide prior to heat treatment, rust and local decarbonization.
2. die quenching heating, cooling quenching medium inappropriate choice of quenching medium too many impurities or aging.
Precaution:
1. Before mold heat treatment should descaling, rust, adequate protection during quenching mold surface should be vacuum furnace, salt bath furnace and heated in a protective atmosphere furnace.
2. mold after quenching heating and cooling, should choose a suitable cooling medium, cooling medium to long-term use regular filter, or periodic replacement.
Second, poor organization cement brick mold before heat treatment
Mold final ball of the organization coarse uneven, imperfect ball, organizations mesh, ribbon and chain carbide, which will die after quenching easy to crack, resulting in mold scrapped.
Reason:
1. Die steel original organization serious carbide segregation
2. Poor forging process, such as forging temperature is too high, a small amount of deformation, stop forging high temperature and slow cooling rate after forging, the forged coarse microstructure and a mesh, ribbon and chain carbide presence, the ball When annealing is difficult to eliminate.
3. Poor ball annealing process, such as the annealing temperature is too high or too low, isothermal annealing time is short, can cause tissue ball annealing uneven or poor ball.
Precaution:
1. General should be based mold working conditions, toughening the performance of the production volume and the material itself, try to choose a good quality tool steel material.
2. Improve the forging process or normalizing preliminary heat treatment to eliminate the raw material mesh and chain carbide and carbide inhomogeneity.
3. can not be serious carbide segregation forged high-carbon tool steel may be solution heat treatment thinning
4. Develop correct spheroidizing specification after forging die blanks, and rapid transfer of heat treatment may be uniform fine ball annealing process.
5. Reasonable installed furnace, ensure uniformity of furnace temperature of die blanks.
Third, cement brick mold quenching cracks
Die cracks in the mold after the biggest drawback of the process, will make the finished mold scrapped, so that production and caused great economic losses.
Cause:
1. exist serious mold material mesh carbide segregation
2. The presence of mold machining or cold plastic deformation stress.
3. Die improper heat treatment operation (heating or cooling too fast, the inappropriate choice of quenching medium cooling temperature is too low, the cooling time is too long, etc.).
The complex shape of the mold, uneven thickness, with sharp corners and screw holes, so that the thermal stress and stress is too large.
5. die quenching temperature is too high or too burned overheating.
6. die quenching and tempering Tempering is not timely or insufficient time
7. When the mold rework quenching without intermediate annealing and quenching heated again.
8. The mold heat treatment, improper grinding process.
9. The mold EDM, hardening layer after heat treatment has a high presence of tensile stresses and micro-cracks.
Precaution:
1. Strict internal quality control mold raw materials, improved ball forging and annealing process, eliminating mesh, ribbon, chain carbide, improve the uniformity of the ball of the organization.
2. In the mold after machining or cold plastic deformation should be to stress annealing and then heated quenching.
3. The complex shape of the mold should be used to plug the threaded hole of asbestos, dressings dangerous section and thin-walled, and the use of quenching or austempering.
The repair or in need of renovation when annealing or tempering mold.
5. The mold should be preheated to take in quenching, cooling pre-cooling measures take time, and select the appropriate quenching medium.
6. should strictly control the quenching temperature and time, to prevent mold overheating and over-burning.
7. The mold should be promptly after quenching and tempering holding time to the full, high-alloy complex mold should be tempered three times.
8. Select the correct grinding process and the appropriate wheel.
9. Improved mold EDM, tempering and stress relief.
Fourth, after quenching thick cement brick mold
Tissues die quenching thick, it will seriously affect the mechanical properties of the mold will make the use of the mold have a fracture, a serious impact on the life of mold.
Cause:
1. Die steel confuse the actual steel quenching temperature is far below the required mold material quenching temperature.
2. before quenching tool steel balls not correctly processing technology, poor ball of the organization.
3. The die quenching heating temperature is too high or the holding time is too long.
The mold is placed in the wrong place in a furnace or heating element near the electrode area prone to overheating.
5. changes in the larger cross section of the mold, the quenching process parameters properly, overheating in thin section and sharp corners.
Precaution:
1. Before steel storage should be strictly checked, to prevent confusion misplacing steel.
2. The mold should be proper forging and annealing the ball before quenching, to ensure good ball of the organization.
3. The right to develop mold quenching process specifications, strict control of the quenching temperature and holding time.
The regular testing and calibration Thermometer, ensure that the instrument is working properly.
5. The mold should be heated in an oven to maintain an appropriate distance from the electrode or heating element.
Shandong Shengya Machinery Co., Ltd. has been committed cement products machinery development, production and sale of advanced equipment, superb technical expertise and two decades of experience, the company has always been at the forefront of research and development center block molding machine market development Follow the advanced technology at home and abroad, to develop products for different investment needs of users, mainly block making machine, hydraulic tile machine, cement pipe machine, mixer, hanging roller machine, telephone poles machine equipment. At present the country with 19 offices and six overseas plants (Nigeria, Tanzania, Algeria, Kenya, Mozambique, Ethiopia) and exported more than 100 countries and regions.