Surface Nitriding Furnace for Cross Wedge Rolling Die
A technology of surface nitriding and cross wedge rolling, applied in metal material coating process, coating, solid diffusion coating, etc., can solve the deformation of cross wedge rolling die, affecting the load-bearing capacity, short service life of cross wedge rolling die, etc. problems, to prevent high temperature heating deformation, improve service life, improve the effect of precision
Active Publication Date: 2019-01-22
SHANDONG HUIFENG TRANSMISSION
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Problems solved by technology
The disadvantage of this cross wedge rolling die manufacturing process is that the hardness of the formed cross wedge rolling die is low, especially the quenched and tempered forming hardness of the widened corrugated and wedge angle parts can only reach 28-32HRC, resulting in a short service life of the cross wedge rolled die The service life of a set of cross wedge rolling dies is generally 60,000 to 80,000 pieces of rolling shafts. Since the price of a set of cross wedge rolling dies is 120,000 to 160,000 yuan, the production cost of shaft rolling is increased; If the quenching and tempering hardness is too high, it will be difficult to finish the mold
The shortcomings of this quenching method are: first, when heated at high temperature, it is easy to deform the widening and wedge corners of the cross-wedge rolling die, which affects the rolling accuracy of the shaft-type rolled pieces; second, the arc-shaped block is deformed, When the arc-shaped block mold is fixed on the upper roll, the joint is uneven, which affects the dimensional accuracy; the third is that the hardness and its service life can only be improved to a limited extent
The disadvantages of this nitriding furnace are as follows: First, during the desalination process, since the inner tank is static, the nitrogen pressure acting on the workpiece is consistent, so the hardness of the surface of the processed workpiece is consistent, and it cannot be adjusted. Parts with different hardness requirements of the workpiece are treated differently; second, because the thickness of the bottom wall of the inner tank is consistent with the thickness of the side wall of the inner tank, it affects the load-bearing capacity; third, the depth and diameter of the inner tank are not suitable for placing the cross-wedge rolling die
[0004] According to the search, there are many reports on the use of nitriding process to improve the hardness of the workpiece, but there is no report on improving the hardness of the cross wedge rolling die; there is no nitriding that makes the hardness of the wedge angle higher than that of the widening corrugated position. craft report
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[0021] figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 An embodiment of the present invention is given. Reference figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 Make the present invention. The cross wedge rolling die surface nitriding furnace includes a furnace body 1, a heating element 2, an inner tank 3, a furnace cover 4, a stirring fan 5, a blower 6, a nitrogen input pipe 7 and a water inlet pipe composed of a stainless steel cylinder and an inner lining. 8. Outlet pipe 9; wherein: the heating element 2 is mounted on the inner wall of the furnace body 1; the inner tank 3 is placed in the middle of the furnace body 1, and the heating cavity 10 is formed between the outer wall of the inner tank 3 and the inner wall of the furnace body 1; The nitrogen inlet pipe 7 extends from one side of the furnace cover 4 into the lower part of the inner tank 3; the motor of the stirring fan 5 is installed in the middle of the upper wall of the furnace cover 4, and the bl...
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Abstract
The invention discloses a cross wedge rolling die surface nitriding furnace, comprising a nitriding furnace and characterized in that a bottom wall of a liner of the nitriding furnace is a thickened plane arranged on a turnplate; the bottom wall of the liner is provided with wedged ribs arranged at equal intervals and rotatable anticlockwise relative to the wedge corner direction of a cross wedge rolling die placed in; the bottom wall of a furnace cover is provided with a circular opening, the upper end of the liner is provided with a neck in connection fit with the circular opening, and a ceramic ring is arranged between the inner wall of the circular opening and the outer wall of the neck. As the peripheral wall of the liner of the nitriding furnace is provided with the wedged ribs and the liner is rotatable, the pressure of nitrogen relative to the surface of the cross wedge rolling die increases with rotation of the wedge corners such that the wedge corners have higher hardness and the service life of the cross wedge rolling die can be extended; trials show that the hardness of the wedge corners reaches 52 HRC, and the hardness of broadened wedge parts reaches 50 HRC; by using a method according to the invention, it is possible to prevent high temperature thermal deformation of the cross wedge rolling die and improve the precision of rolled shafts.
Description
Technical field [0001] The invention relates to an improvement of a nitriding furnace, in particular to a cross wedge rolling which is specially used for the surface nitriding of the cross wedge rolling die, the temperature is heated to 540-570℃, the high temperature deformation is prevented, and the hardness can be increased to 48-52HRC. Nitriding furnace for mold surface. Background technique [0002] The cross wedge rolling die is an important forming part for rolling shaft parts by the cross wedge rolling process, including arc blocks. The surface of the arc block has wedge angles with different functions and widening flutes with different functions; wedge angles with different functions and The widening flutes with different functions are designed according to different shaft parts; a set of cross wedge rolling die consists of 8 pieces, which are fixed on the circumferential surface of the cross wedge roll in order. The height of the arc block is 900mm, and the arc length is...
Claims
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IPC IPC(8): C23C8/24
CPCC23C8/24
Inventor魏烈军魏光禄王环环
OwnerSHANDONG HUIFENG TRANSMISSION