TWI594834B - Hard roll manufacturing method and its high hardness alloy welding consumables - Google Patents

Description

Method for manufacturing hard surface roller and high hardness alloy welding material

The present invention relates to a method of manufacturing a roller, and more particularly to a method of manufacturing a hard surface roller and a high hardness alloy welding material thereof.

On the hot and cold rolled steel product line, the cold-rolled steel sheet is often tempered and finished with a rolling roller. In order to improve the service life of the roller, it is a common practice to perform surface heat treatment (such as surface circumferential treatment or quench hardening treatment) on the roller so that the roller forms a hardened thin layer from the surface inward, and the hardened thin layer can be used. Improve the wear resistance of the roller, and thus extend the service life of the roller.

However, the surface heat treatment method can only form a thin hardened layer (thickness < 2 mm) on the surface of the roller, and its hardness and wear resistance are still limited, and once the hardened thin layer is worn out, it is limited by the roll diameter of the roller. With minimal use restrictions, the roller usually has to be discarded and can no longer be used.

Therefore, it is necessary to provide an innovative and progressive method of manufacturing a hard surface roller and a high hardness alloy welding material to solve the above problems.

The invention provides a method for manufacturing a hard surface roller, comprising the steps of: providing a roller base material having a surface; and welding a hardened layer to the roller base with a high hardness alloy welding material The surface of the material, the high hardness alloy consumable is calculated by the total weight of 100 wt%, including 0.50-3.00 wt% carbon, 1.50-6.00 wt% molybdenum, 0.30-1.20 wt% bismuth, 0.20-2.00 wt% manganese, 3.00-18.00 Wt% chromium, 0.20-1.50wt% vanadium, 0.50-5.00wt% Tungsten, less than 0.01 wt% cobalt, less than 0.03 wt% phosphorus, less than 0.03 wt% sulfur, and the balance of iron and unavoidable impurity elements.

The invention further provides a high hardness alloy welding material, which is calculated by a total weight of 100 wt%, including 0.50-3.00 wt% carbon, 1.50-6.00 wt% molybdenum, 0.30-1.20 wt% bismuth, 0.20-2.00 wt% manganese, 3.00- 18.00 wt% chromium, 0.20-1.50 wt% vanadium, 0.50-5.00 wt% tungsten, less than 0.01 wt% cobalt, less than 0.03 wt% phosphorus, less than 0.03 wt% sulfur, and the balance of iron and unavoidable impurity elements.

The invention welds the hardened layer on the surface of the roller base material with a high hardness alloy welding material, thereby increasing the thickness of the hardened layer on the surface of the roller, thereby prolonging the service life of the roller. In addition, the present invention can also repair the worn roller which is excessively worn, so that it can be regenerated.

The embodiments of the present invention can be more clearly understood, and the objects, features, and advantages of the present invention will become more apparent. The details are as follows.

S11~S12‧‧‧Steps

20‧‧‧Roller substrate

20S‧‧‧ surface

30‧‧‧ hardened layer

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flow chart showing the manufacturing method of the hard surface roller of the present invention; and Figs. 2A to 2B are views showing the manufacturing method of the hard surface roller of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart showing the method of manufacturing the hard surface roller of the present invention. 2A to 2B are views showing a manufacturing method of the hard surface roller of the present invention. Referring to step S11 of FIG. 1 and FIG. 2A, a roller substrate 20 having a surface 20S is provided.

Referring to step S12 and FIG. 2B of FIG. 1, a hardened layer 30 is welded to the surface 20S of the roller substrate 20 by a high hardness alloy welding material. In this step, the high hardness alloy consumable is calculated to have a total weight of 100 wt%, including 0.50-3.00 wt% carbon, 1.50-6.00 wt% molybdenum, 0.30-1.20 wt% bismuth, 0.20-2.00 wt% manganese, 3.00- 18.00 wt% chromium, 0.20-1.50 wt% vanadium, 0.50-5.00 wt% tungsten, less than 0.01 wt% cobalt, less than 0.03 wt% phosphorus, less than 0.03 wt% sulfur, and the balance of iron and unavoidable impurity elements. Preferably, this is unavoidable The impurity element is excluded from 2.00-10.00% by weight of the total weight of the solder material.

In the present embodiment, since the hardened layer 30 is formed on the surface 20S of the roller base material 20 by welding, the thickness of the hardened layer 30 can be 2 to 20 mm. Further, the hardness of the hardened layer 30 formed of the high hardness alloy consumable may also reach HS75 to HS90.

The invention is illustrated by the following examples, which are not intended to be limited to the scope of the invention.

First, set the roller to be used normally with a roller diameter of 500 mm or more. When the roll diameter of the roller is worn to 500 mm (minimum roll diameter) due to rolling, if the roller is re-formed into the hardened layer from the surface by the conventional surface heat treatment method, the roll diameter of the roller can no longer be increased. More than 500mm, only the roller can be discarded at this time, and the new roller is replaced.

However, when the hardened layer is welded to the surface of the roller by the high hardness alloy welding material of the present invention, since the hardened layer is formed outward from the surface of the roller, and the thickness of the hardened layer can be 2 to 20 mm, it can be improved. The roller diameter of the roller reaches 502mm to 520mm, which not only prolongs the service life of the roller, but also regenerates the roller which has to be discarded due to excessive wear.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the scope of the present invention. The scope of the invention should be as set forth in the appended claims.

S11~S12‧‧‧Steps

Claims (6)

A method for manufacturing a hard surface roller, comprising the steps of: providing a roller substrate having a surface; and welding a hardened layer to a surface of the roller substrate with a high hardness alloy welding material The high hardness alloy consumable is calculated to have a total weight of 100 wt%, including 0.50-3.00 wt% carbon, but excluding 0.50 wt% carbon, 1.50-6.00 wt% molybdenum, 0.30-1.20 wt% bismuth, 0.20-2.00 wt% Manganese, 3.00-18.00 wt% chromium, 0.20-1.50 wt% vanadium, 0.50-5.00 wt% tungsten, less than 0.01 wt% cobalt, less than 0.03 wt% phosphorus, less than 0.03 wt% sulfur, and the balance of iron and unavoidable impurity elements . The method of manufacturing the hard-faced roller of claim 1, wherein the hardened layer has a thickness of 2 to 20 mm. The method of manufacturing the hard-faced roller of claim 1, wherein the hardened layer has a Shore hardness of from HS75 to HS90. The method of manufacturing the hard-faced roller of claim 1, wherein the unavoidable impurity element accounts for 2.00-10.00% by weight of the total weight of the welding material. A high-hardness alloy consumable, calculated from a total weight of 100 wt%, including 0.50-3.00 wt% carbon, but excluding 0.50 wt% carbon, 1.50-6.00 wt% molybdenum, 0.30-1.20 wt% bismuth, 0.20-2.00 wt% Manganese, 3.00-18.00 wt% chromium, 0.20-1.50 wt% vanadium, 0.50-5.00 wt% tungsten, less than 0.01 wt% cobalt, less than 0.03 wt% phosphorus, less than 0.03 wt% sulfur, and the balance of iron and unavoidable impurity elements . The high hardness alloy welding material of claim 5, wherein the unavoidable impurity element accounts for 2.00-10.00% by weight of the total weight of the welding consumable.