JPH0222207Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to a belt grinding machine having a crimping and swinging mechanism that enables uniform grinding by following the inclination of the surface and corners of a workpiece during grinding after removing defects from a steel billet. be. (Prior Art) In general, long or slender steel materials such as steel slabs tend to have defects on the surface during the cutting process, and these defects often become a major hindrance to the utilization of the steel materials. Conventionally, surface defects on semi-finished steel billets were removed using a grinder or scarfing, but as quality requirements have become faster in recent years, the quality after removing defects has become quite strict. It's summery. That is, it has been found that not only remaining defects but also surface roughness and remaining burrs after removal of defects have a great influence on quality. For this reason, recently, materials with strict quality requirements have been grinded or scarfed and then finished ground using a general-purpose belt grinder or disc grinder. Conventional technologies for these belt grinding machines include the following. The steel material flaw removing device shown in No. 49-49291 is a tension adjustment device for the belt sander, in which a belt sander pulley and a pressing device are attached to the frame in a cantilevered manner, and the device simply presses the workpiece, thereby reducing the inclination of the workpiece. It is not arranged so that it can be followed. Therefore, the present invention cannot be applied to a workpiece having a face portion and a corner portion. A similar item is Utility Model No. 50-314. The main components of this system are a grinder that removes surface flaws from the material to be processed, and a drive device that raises and lowers the grinder.
It is similar to the one shown in No. 49291, and does not mention that it follows the slope of the workpiece. Furthermore, Japanese Patent Application Laid-Open No. 47-44395 describes a grinding method using a wide belt sander.
This can also be done by providing an elastic pressure body using an air tube to press the belt sander against the material to be processed. Since this method uses compressed air, it seems to be able to relatively follow the inclination of the workpiece, and it seems to be applicable to cases where the amount of flaws to be removed is relatively small. However, the present invention cannot be used for heavy grinding, that is, a relatively large amount of flaw removal, because of the weak pressing force and the tube being easily damaged. As described above, no apparatus or method has been found that satisfies the uses of the present invention in any of the above cases. (Problems to be Solved by the Invention) The problems to be solved by the invention have been outlined above, and will be explained in more detail below. When using a grinder to remove defects on the surface of a steel billet or billet that is used as a raw material for wire rods, steel bars, etc., the grinder uses a relatively rough grinding stone to improve the efficiency of the removal work, and is capable of high horsepower and high pressure bonding. Heavy grinding is carried out, but along with this, the surface roughness becomes coarser due to the grain of the grinding wheel and burrs are generated due to the grinding. It is known that these defects turn into defects when rolled into wire rods, and if they are not completely removed, especially in steel types that require high quality, the value of high quality will be significantly reduced. Conventionally, this type of steel requires a great deal of labor and time, and generally uses a portable belt grinder or disk grinder to remove roughness or grinding burrs on billet surfaces that lack flatness. This has been removed to ensure quality. As mentioned above, the surface of the steel slab is not necessarily flat, and in many cases, the oscillating axis of the contact wheel 1 passes through points A, B, C, etc., as shown in FIG. When grinding the workpiece W, if the workpiece has an inclination, the grinding point will shift laterally or the grinding belt will run sideways, and this resistance and grinding reaction force will also act, making it difficult to follow the undulating inclination of the workpiece. It is difficult to achieve a uniform grinding depth because it is difficult for tools such as grindstones to hit the grinding wheel evenly. It was particularly difficult to grind the corners. For this reason, surface defects such as surface roughness and grinding burrs cannot be completely removed, so it has been a challenge among those in the industry to find an optimal crimping and swinging mechanism. (Means for Solving the Problems) As will be explained below, the means for achieving the above object of the present invention is to follow the slope of the workpiece material in order to enable uniform grinding of surface defects such as steel slabs. To make this possible, a conventional belt grinding machine is equipped with a crimping and swinging mechanism. In the device of the present invention, a boom 5 equipped with a contact wheel 1, a belt tension roller 2, an electric motor 3 for driving the grinding belt, and a cylinder 4 for pressurizing the contact wheel is attached to a fulcrum shaft 8 supported by an upper foot 7, and this shaft is The contact wheel 1 at the center can be moved up and down by the pressurizing cylinder 4, and when the contact wheel 1 contacts the surface of the workpiece W, the swing shaft 9 provided in the fulcrum shaft 8 is rotated according to the surface inclination. Grinding belt 6 that swings around the center
It has a mechanism that makes uniform contact with the surface of the workpiece. That is, the feature of the present invention is that a contact wheel 1, a belt tension roller 2, an electric motor 3 for driving the grinding belt, and a cylinder 4 for pressurizing the contact wheel are mounted so that the grinding marks are formed in the longitudinal direction of the workpiece W. The boom 5 is arranged in the longitudinal direction of the workpiece, and the swing axis X-X passes through the center of the contact surface between the grinding belt 6 and the workpiece W via the contact wheel 1, and the workpiece is The boom 5 has a swing mechanism that follows the inclination of the surface, and the entire boom 5 including the contact wheel can be tilted left and right arbitrarily about this axis X-X, and grinding pressure can always be applied perpendicularly to the grinding surface. This belt grinding machine is characterized by having a crimping mechanism and has a crimping and swinging mechanism. (Example) Next, the present invention will be explained in detail using an example apparatus shown in FIGS. 1 to 8. A boom 5 having a contact wheel 1, a belt tension roller 2, a grinding belt drive electric motor 3, and a contact wheel pressurizing cylinder 4 mounted on an upper frame 7 and a fulcrum shaft 8 is attached to a swing shaft 9 within the fulcrum shaft 8. There is. The swing shaft 9 is connected to a tilting cylinder 10, and this tilting cylinder 1
0 has a horizontal shaft 11 fixed to the upper frame 7 and is held by an arm 12 attached to this horizontal shaft 11.
This arm 12 is located between a movable stopper 13 that adjusts the range of swing of the contact wheel 1 and a block cylinder 14 that restricts the swing of the contact wheel 1.
When the arm 12 is in contact with the workpiece W, the blocking cylinder of the arm 12 is loosened and is in a floating state. The present invention described above may be combined with a rough grinding device to perform rough grinding and finish grinding at the same time. (Function) To explain the function of the present invention, during surface grinding of the workpiece W, the tilting cylinder 10 is operated so that the rotation axis of the contact wheel 1 is approximately horizontal, and the arm 12 holding the tilting cylinder 10 is activated. By loosening the restricting block cylinder 14 and adjusting the movable stopper 13, the range of swing of the arm 12 is determined (in the embodiment, it was set to 3 degrees on each side). The entire boom 5 can be moved around the fulcrum shaft 8 by the contact wheel crimping cylinder 4 via the contact wheel 1 until the grinding belt 6 comes into contact with the surface of the workpiece W. If the surface of the workpiece W is inclined when the grinding belt 6 is in contact with the surface of the workpiece W via the contact wheel 1, the grinding belt 6 is oscillated around the swing axis 9 as a fulcrum until it follows the surface of the workpiece W. move. When the grinding belt 6 is brought into contact with the corner of the workpiece through the contact wheel 1, the entire boom 5 is tilted to the left or right by operating the tilting cylinder 10, and the contact wheel pressurizing cylinder 4 is operated to move the contact wheel 1. When the grinding belt 6 is pressed onto the workpiece W through the contact wheel, the entire boom 5 is also tilted, so the force generated on the contact surface between the contact wheel pressurizing cylinder 4, the contact wheel 1 and the workpiece W is perpendicular to the contact surface. Because of this, there is no force that would cause the grinding point to shift or the grinding belt to run sideways, making it possible to perform uniform grinding work. The results obtained using the beveled grinding machine of the present invention under the following conditions are shown below. Prerequisite equipment specifications (a) Belt dimensions 200mm x 2400mm (b) Belt speed 1800m/min (c) Belt drive motor 37Kw x 4p (d) Grinding pressure Max 200Kg (e) Hydraulic unit Discharge rate 20/min Pressure 70Kg/ cm ² (f) Contact wheel material Flexible hard rubber Dimensions of work material 122□ Corner part 15R Implementation results Regarding surface flaw detection, the number of detected wire surface flaws is shown below in comparison with conventional technology, but the number of surface flaws is large. It decreased drastically.

[Table] The effect was particularly noticeable in low carbon materials (C0.12). (Effects) The device of this invention is applied to a grinding machine that uses high horsepower and high pressure bonding to clean defects, and is equipped with a contact wheel with a flexible rubber lining and a grinding head with a swing axis in the center of the grinding surface. By incorporating it as a grinder, it is possible to follow the slope and achieve uniform grinding to obtain a finished surface with good surface quality. As a result, the number of detected surface flaws can be greatly reduced. By connecting a rough grinding machine to this invention, the function of removing surface roughness and grinding burrs can be shared with the finish grinding machine, making it even more effective to simultaneously perform rough grinding and finish grinding in one process. It has excellent functions.

[Brief explanation of the drawing]

Fig. 1 is an overall front view of the embodiment, Fig. 2 is an overall side view of the same, Fig. 3 is a side view of the boom, Fig. 4 is a plan view of the boom, Fig. 5 is a front view of the boom, and Fig. 6 is a swinging view. 7 is a diagram showing the boom fulcrum, FIG. 8 is a sectional view of the swing shaft, and FIG. 9 is an explanatory diagram of the swing shaft of the conventional machine. 1... Contact wheel, 2... Belt tension roller, 3... Belt drive electric motor, 4
...Contact wheel pressurizing cylinder, 5...
...Boom, 6... Grinding belt, 7... Upper frame, 8... Fulcrum shaft, 9... Rocking axis, 10... Tilt cylinder, 11... Horizontal axis, 12... Arm, 1
3... Movable stopper, 14... Block cylinder, W... Work material, A... Swing point, B... Swing point, C... Swing point.

Claims (1)

[Scope of utility model registration request] Contact wheel 1, belt tension roller 2,
A boom 5 equipped with an electric motor 3 for driving the grinding belt and a cylinder 4 for pressurizing the contact wheel is disposed in the longitudinal direction of the workpiece.
The swing axis X-X is made to pass through the center of the contact surface between the grinding belt 6 and the workpiece W through the Crimping and rocking of a belt grinding machine characterized by having a crimping mechanism that allows the entire boom 5 including the contact wheel to tilt left and right at will around X-X, and to always apply grinding pressure perpendicularly to the grinding surface. Belt grinding machine with a moving mechanism for grinding after removing steel flakes.