KR19990081356A - Growing welded grinding roller, manufacturing method and apparatus - Google Patents

Abstract

The present invention relates to a grinding roller which has developed a high-quality, high-quality special steel with excellent wear resistance or corrosion resistance on the surface of a general cast steel roller, and a method and apparatus for manufacturing the same, in a welding system for producing a curved weld bead pattern. Weld welding is carried out along the S-curve in the longitudinal direction while weaving the welding torch left and right, and the feed motor provides the driving force necessary to transfer the seat on which the welding torch and weaving devices are installed in the welding direction, and rotates by the feeding motor. Moves the welding torch and the whole seat along the rail in the welding direction of the grinding roller, and converts the rotation of the gear into a linear reciprocating motion by the cam action and uses the rack-pinion gear to reverse the linear reciprocating motion. Change to exercise

The forward and reverse rotational movements change the direction of the rotation side and the magnitude of the forward and reverse rotations through the transmission with an axial angle of 90 degrees.The gearbox changes the welding torch to the left and right linear reciprocating movements. The welding bead is moved along the S-curve as a whole because the welding torch is reciprocated to the left and right while conveying along the rail in the longitudinal direction of the roller.

Description

Growing welded grinding roller, manufacturing method and apparatus

The present invention relates to a grinding roller and a manufacturing method and apparatus thereof for fusing and welding a special steel of high quality and high quality with excellent wear resistance, impact resistance and corrosion resistance on the surface of the cast steel grinding roller.

Grinding rollers in the fields of cement, thermal power plants, steelmaking, etc., because of the large-scale crushing of high-strength materials such as minerals and clinkers (size), very wear occurs.

Roller mills used to grind them include cylindrical rollers, cone rollers, and tire roller mills.

These mills are often subjected to localized impact due to non-uniform wear caused by sliding during grinding of high-strength materials and vibration of the rollers, so that the base metal of the roller is often dropped.

Commonly used grinding roller materials include high manganese cast steel, high chrome cast steel, and die hard steel, but they are carbon, chromium, tungsten, and niobium. Chrome and composite carbide flux cored wire welding rods containing special metals are used to grow and weld grinding rollers to extend the service life of the rollers 2-3 times.

However, when using the grinding roller by growing with high chromium and composite carbide welding rods, the grinding efficiency decreases due to non-uniform wear caused by the sliding of the roller, excessive vibration caused by the non-uniform wear, and the operation of the device due to the dropping of the welded part and the base metal. Interruptions and serious breakdowns are causing huge economic losses.

The advantages of the weld bead pattern, which can reduce cracks and deformations while improving wear resistance, prevent slippage of the media, and uniformly wear down the rollers and significantly reduce vibration, will be described in comparison with the linear weld bead pattern.

In the case of welding growth of the total area, if the welding is performed in a straight line, the shrinkage direction after welding is linearly aligned in the direction of the arrow in Fig. 2A, and the deformation continues to accumulate, causing severely large cracks.

However, in the case of welding in a curved shape, the shrinkage direction was shifted from each other, so that the amount of deformation was greatly reduced, resulting in small cracks.

Therefore, when welded in a curved pattern, not only the aesthetics were beautiful but also the defects were greatly reduced due to the reduction of cracks.

In addition, when the weld bead is overlapped in a straight line, the wear medium continuously passes through this overlap due to the occurrence of valleys or defects in the overlapping portion. Because the parts are not straight, the wear medium can evenly pass over the weld bead, reducing the priority wear of certain areas.

The shape of this curve has the form of a sinusoidal (SIN) curve.

The amplitude and period of the curve can be arbitrarily changed.

As such, the curved weld bead pattern of the wear resistant welding roller has various advantages.

However, a welding system has to be manufactured to produce such a pattern.

Since the welding torch has to follow the S-curve in the circumferential direction along with the left and right weaving, there are many difficulties in making the weld bead pattern of this curve.

The control method of the welding system is electronically and left-right weaving, and the S-curve in the circumferential direction is difficult to obtain the weld bead pattern and, if possible, very expensive.

The present invention has developed a welding system that can be easily obtained by a kinematic control method.

When the electronic control method is applied to these control methods, a large number of electromagnetic waves and heat are generated due to the welding characteristics, which may cause malfunction or failure of the electronic device.

In addition, in order to combine various S-curves with the width and speed of weaving, the configuration of the electronic device is very complicated, and it is difficult to write a program for operation, so it is not practical for workers to use in the field.

In addition, if the electronic control method, the manufacturing cost is very expensive due to the necessity of shielding device for heat or electromagnetic wave and the complexity of the electronic device for controlling various S-curves.

In addition, the arc is often turned off during welding or the welding wire is exhausted, and the welding welding is often interrupted.

At this point, the welding should be done exactly along the S-curve at the position where the welding was stopped.

In this case, the electronic control is controlled by the numerical value, so to return to the original position after the welding stops, the numerical value of the interrupted position and the vector value of the S-curve must be input again correctly. It is almost difficult to figure out correctly.

As a result, even though the welding bead pattern such as the S-curve is possible by electronic control, it is difficult to be used in the actual welding site.

The present invention is to reduce the sliding of the pulverized product when the welding of the surface of the grinding roller in the form of oblique and S-curve to form a wear pattern in a uniform shape of the roller and to significantly reduce the vibration of the machine to improve the grinding efficiency Started.

The growth welding process of the grinding roller by flux cored arc welding of the present invention is as shown in FIG.

Welding of grinding roller is carried out by automatic welding, and welding material uses flux cored wire containing a large amount of special metal element.

Unlike welding of the structure, welding a large area, welding torch is welded while moving in length and circumferential direction while weaving to left and right with a width of 10-30MM.

After one row of welding, the grinding roller is moved circumferentially and longitudinally and welded again to the left, right weaving and longitudinally.

In this way, after the first layer welding on the surface of the roller is completed, the two-layer and three-layer continuous welding are repeated according to the thickness specified by the grinding roller.

Typically, two or three welding torches are connected in parallel and welded at the same time to reduce the welding growth time.

As such, there are many problems to be improved in flux cored welding of the grinding roller.

First, in the welding growth method using flux cored wire, high arc heat generated between the roller and the electrode is transferred directly to the roller.

The difference in expansion coefficient is large due to the big difference between the welding material and the base material of the roller, and it can cause deformation due to the difference of shrinkage rate during cooling because of severe temperature gradient in the welding process. .

Weld welding materials that are applied to extreme wear are basically high in hardness and contain a large amount of alloying elements, so most of the cracks are generated in the weld bead after the welding.

Such cracking is difficult to avoid completely.

However, these grinding rollers have a small impact load, so that small cracks on the surface of the roller affect the base metal and cause problems.

However, as shown in the arrow shown in FIG. 2, when the cracks overlap and grow and weld linearly, the progress direction of the cracks coincide with each other and continue to develop into large cracks, which may cause serious problems.

However, in the case of the S-curve shape, since the micro cracks progress radially, they do not overlap with each other.

Since the growth welding rod contains a large amount of very expensive alloying components, the welding material is expensive, so it is important to economically reduce the consumption of the welding material and secure sufficient wear resistance.

Depending on the application area of the grinding roller, it is not necessary to fully weld the entire area, but only partial welding is sufficient.

Particularly, the welding part is welded to repair parts, which reduces the welding material and has advantages such as short time of construction time.

However, such partial welding can have the greatest advantage only by having an appropriate welding bead pattern according to the wear environment, wear medium, and the like of the welded portion.

Therefore, the design technology of the welding bead pattern according to the wear environment and the welding system capable of welding in an appropriate pattern is important.

When the grinding roller is grown and welded by flux cored arc welding, there is a need for preventing deformation of the roller, preventing diffusion of cracks, preventing slippage of the medium, and cost reduction and quality improvement due to partial welding.

In the course of studying the causes of these problems, it has been found that by changing the weld bead pattern of the grinding roller into the S-curve pattern rather than the linear weld bead pattern of operation, many problems mentioned above can be greatly alleviated.

The present invention can improve the productivity by reducing the deformation after welding cladding, preventing the spread of cracks, reducing the sliding of the grinding media and uniform wear to improve the conventional problems, and has a beautiful S-curve weld bead pattern The purpose is to produce a grinding roller.

Another object of the present invention is to provide a welding system capable of welding the grinding roller in the form of an S-curve at the same time as the left and right weaving of the torch by a mechanical method.

1 is a growth welding method of a grinding roller by flux cored arc welding

Figure 2 is a bead pattern of diagonal and S-curve for different types of grinding rollers

3A is an exemplary embodiment of a welding device for welding a bead pattern of diagonal and S-curve to a grinding roller.

Figure 4 is a photograph of the grinding roller having a weld bead pattern of the S-curve pattern welded using the welding system of the present invention

Explanation of symbols on the main parts of the drawings

(11): welding torch (12): feed motor

(13): gear 14: rail

(l5): Cam 16: Rack-Pinion Gear

(17) (18): Transmission (19): Gearbox

20a: drive motor 22: turning roller

22a: cone type turning roller device 23: cylindrical grinding roller

(24): cone grinding roller

In order to achieve the above object, the present invention solves all by using a kinematic control method.

The present invention is one or more welding torch 11 in the welding system for producing a curved weld bead pattern while the left and right weaving while moving along the S-curve in the circumferential direction of the roller while feeding welding The motor 12 provides the driving force necessary to transfer the base on which the welding torch 11 and the weaving devices are installed in the welding direction, and the rotation by the transfer motor 12 is carried out by the gear 13 and the welding torch 11 and the whole. The grinding roller is moved circumferentially along the rail 14 along the pedestal.

The rotation of the gear is converted into a linear reciprocating motion by the cam 15 action, and the linear reciprocating motion is converted into a forward and reverse rotational motion using the rack-pinion gear 16.

The forward and reverse rotational movements change the direction of the rotation axis and the magnitude of the reverse rotation through the transmissions 17 and 18 having an axial angle of 90 degrees, and the gearbox 19 moves the welding torch 11 as a forward and reverse rotational movement as a whole. Change to left and right linear reciprocating motion.

The welding bead moves along the S-curve as a whole, because the welding pedestal reciprocates left and right while the entire pedestal moves along the rail in the circumferential direction of the roller.

In addition, the gear box 19 is further connected to the drive motor 20a capable of forward and reverse reciprocating motion to allow the welding torch to weave from side to side.

The width and speed of the left and right weaving can be adjusted by the forward and reverse rotation amounts and speed of the drive motor 20a.

The amplitude in the circumferential direction can be adjusted by the transmission gears 17 and 18.

This is performed by the normal control unit 21.

In addition, the period of the S-curve can be adjusted by the size of the gear 13 or by attaching a transmission to the cam 17.

The welding speed running in the circumferential direction may be adjusted by the rotation speed of the turning roller.

Thus, we developed a welding system that can freely adjust the amplitude, period, and speed of the S-curve in the width, speed, and circumferential direction of all weaving.

All devices are kinematically engaged and can be re-welded from where they left off without any problem in returning to their position, even if the welding is interrupted in the middle.

Such the present invention can be applied in various industries because the conventional problem is solved all by using a kinematic control method is expected to the effect.

Claims (3)

The welding torch is welded one layer or overlapping while welding along the diagonal and S-curve in the circumferential direction while weaving the left and right at the same time. Cylindrical and cone grinding roller, characterized in that the weld In order to produce a curved weld bead pattern, the welding torch is controlled by the forward and reverse serial sub-motors, and the left and right weaving widths and speeds are controlled, while the left and right weaving are carried out along the S-curve in the circumferential direction of the rollers. The transfer motor provides the driving force necessary to transfer the seat on which the welding torch and weaving devices are installed in the welding direction, and the rotation by the feeding motor causes the welding torch and the seat to move circumferentially on the roller along the rail through the gears. The cam action changes the rotation of the gear into a linear reciprocating motion.The forward and reverse rotational motions change the direction, direction and reverse rotation of the rotational axis through the transmission with an axial angle of 90 degrees. To the left and right linear reciprocating motion, and the torch moves left and right along the rail along the rail in the longitudinal direction of the cylinder. Method of manufacturing a raised welded grinding roller characterized in that the welding bead moves along the S-curve because it reciprocates In order to rotate the cylindrical grinding roller 23 or the cone grinding roller 24 to produce a curved weld bead pattern, the turning roller 22 or the cone type turning roller device 22a is installed on the bench and the roller described above. (23) (24) The welding torch 11 is installed on the upper part, and this welding torch 11 is installed on the forward and reverse movement mechanism such as a belt, and the forward and reverse movement mechanism is connected to the direct and reverse DC servo motor 20a. To the gearbox 19 and the gearbox 19 via the transmission 18.17, via the rack pinion gear 16 and the cam 15 and also via the gear 13 on the rail 14 The production-welded grinding roller manufacturing apparatus characterized by the structure connected to the motor 12.