JP5508979B2 - Grinding equipment - Google Patents

Description

  The present invention relates to a grinding apparatus that grinds the protruding portion by causing the endless belt for grinding to run while being pressed against the protruding portion.

  In general, in a manufacturing process of a metal product, for example, an operation of removing a projecting portion such as a weld bead formed by welding or a cast beam formed by casting is performed. In this type of work, for example, a grinding apparatus is used that presses the endless belt for grinding against a protruding portion to grind the protruding portion by pressing a roller against the inner peripheral surface of the endless grinding belt that runs around. Yes.

  However, in the endless belt for grinding, the portion where the protruding portion is ground has an arc shape corresponding to the roller shape. Therefore, since the endless belt for grinding grinds the projection part by point contact, if the position of the projection part is shifted, the grinding conditions such as the grinding direction, the grinding area, and the grinding angle are easily changed, and the grinding quality is not stable. There's a problem.

  Therefore, for example, a bead removing device disclosed in Patent Document 1 is known. In this bead removing device, as shown in FIG. 5, three pulleys 1a are arranged at the apexes of a triangle, and a grinding belt 2a is hung around the pulleys. One pulley 1a is connected to a motor 3a so that the grinding belt 2a travels around.

  In the grinding belt 2a, a swinging device comprising an arm 4a, a rubber winding roller 5a and a swinging cylinder 6a is provided. The lower end of the rubber winding roller 5a protrudes downward from the lower side of the grinding belt 2a, so that a part of the lower side of the grinding belt 2a slightly protrudes downward.

  The arm 4a is rocked by a rocking cylinder 6a. For this reason, the rubber winding roller 5a varies the position of the protruding portion of the grinding belt 2a, and the surface to be processed is ground by the variable protruding portion of the grinding belt 2a.

  Further, in the automatic cutting device and the automatic cutting / polishing device disclosed in Patent Document 2, as shown in FIG. 6, a polishing tool (cutting tool) 3b is attached to the rotating shaft 2b of the rotation drive device 1b. ing. And the grinding | polishing operation | work (cutting operation | work) is given to the welding bead 5b of the workpiece | work 4b by rotating the grinding | polishing tool 3b via the drive device 1b for rotation.

Japanese Patent Laid-Open No. 7-132396 Japanese Patent No. 3821909

  However, in Patent Document 1 described above, a rocking device including an arm 4a, a rubber winding roller 5a, and a rocking cylinder 6a is provided, and this rocking device is disposed inside the grinding belt 2a. Accordingly, the entire bead removing device is considerably increased in size, and the configuration of the device is complicated, which is not economical.

  Moreover, in said patent document 2, in order to remove the weld bead 5b, the disk shaped polishing tool 3b is used. In this polishing tool 3b, since the contact shape with the weld bead 5b is circular, the contact area with the weld bead 5b is likely to change, and there is a problem that the grinding conditions vary. In addition, since the grinding area is considerably small, there is a problem that the time during which grinding can be performed effectively is shortened, and the polishing tool 3b must be frequently replaced in a short time.

  The present invention solves this type of problem, and an object thereof is to provide a grinding apparatus capable of grinding a protruding portion with high accuracy with a compact and economical configuration.

  The present invention relates to a grinding device that grinds the protruding portion by causing the endless belt for grinding to run while being pressed against the protruding portion. This grinding device is disposed on the inner peripheral surface of the endless belt for grinding so as to oppose the pressing position to the projecting portion, and the end surface shape for pressing the inner peripheral surface of the endless belt for grinding is set to a square shape. Provided with a pressing block.

  Further, in this grinding apparatus, the pressing block is provided with a cushion material on the end surface on the contact side with the endless belt for grinding, and a protective sheet member is interposed between the cushion material and the inner peripheral surface of the endless belt for grinding. The protective sheet member is fixed to at least one of the pressing block or the cushion material at the end in the traveling direction of the grinding endless belt at the contact position with the grinding endless belt, In addition, it is preferable that an end portion on the downstream side in the running direction of the endless belt for grinding at a position in contact with the endless belt for grinding is configured as a free end.

  Furthermore, in this grinding apparatus, the protruding portion is preferably a weld bead.

  According to the present invention, the pressing block is disposed on the inner peripheral surface of the grinding endless belt so as to oppose the pressing position against the protruding portion, and the pressing block extends the inner peripheral surface of the grinding endless belt. The end face shape to be pressed is set to a square shape.

  For this reason, in the endless belt for grinding, the contact portion with the projecting portion has a quadrangular shape (planar shape), and it is possible to prevent as much as possible the occurrence of a dent in the workpiece after grinding. In addition, since the end face shape is a quadrangular shape, even if the relative position between the pressing block and the protruding portion is shifted, the grinding conditions such as the grinding area do not change, and uniform grinding can be performed reliably.

  Thereby, it becomes possible to grind the projection portion with high accuracy and easily with a compact and economical configuration.

1 is a schematic configuration diagram of a grinding apparatus according to a first embodiment of the present invention. It is principal part perspective explanatory drawing of the said grinding device. It is operation | movement explanatory drawing of the said grinding apparatus. It is principal part perspective explanatory drawing of the grinding apparatus which concerns on the 2nd Embodiment of this invention. It is explanatory drawing of the bead removal apparatus currently disclosed by patent document 1. FIG. It is explanatory drawing of the automatic cutting and grinding | polishing apparatus currently disclosed by patent document 2. FIG.

  As shown in FIG. 1, a grinding apparatus 10 according to a first embodiment of the present invention includes a grinding endless belt 12, and the grinding endless belt 12 is arranged corresponding to each triangular apex. It is hung on three pulleys 14a, 14b and 14c.

  The pulleys 14a to 14c are rotatably supported with respect to the frame member 16, and one pulley 14a functions as a drive pulley. Specifically, the driven pulley 18 is coaxially integrated with the pulley 14a, and a belt 22 is hung on the driven pulley 18 and the driving pulley 20. The drive pulley 20 is attached to the motor 24 and driven to rotate.

  The pulley 14 b is supported by a rod 26 a extending from a cylinder 26 provided on the frame member 16. As will be described later, the pulley 14b can be advanced and retracted in the direction of arrow A depending on the application.

  Endless belt 12 for grinding grinds the projection part of work W, for example, welding bead Wb. A pressing block 28 is disposed on the inner peripheral surface of the endless belt 12 for grinding so as to face the pressing position against the weld bead Wb.

  For example, the pressing block 28 is fixed to the frame member 16 via a fixing screw 30. As shown in FIGS. 1 and 2, the pressing block 28 has a rectangular parallelepiped shape and is made of a steel material (for example, JIS SS400). In the pressing block 28, the end surface shape that presses the inner peripheral surface of the grinding endless belt 12 is set to a square shape.

  The pressing block 28 is provided with a cushion material 32 on the end surface on the contact side with the endless belt for grinding. The cushion material 32 has the same shape as the end face shape of the pressing block 28 and is fixed to the end face. The cushion material 32 has a function of absorbing vibration at the time of grinding, and is made of, for example, a urethane sponge sheet.

  A protective sheet member 34 is interposed between the cushion material 32 and the inner peripheral surface of the grinding endless belt 12. The protective sheet member 34 is a material having heat resistance and wear resistance to protect the cushion material 32 and the endless belt 12 for grinding. For example, the protective sheet member 34 is made of glass cloth in which glass fiber is impregnated with fluororesin (PTFE). Composed.

  In the protective sheet member 34, an end 34a on the upstream side in the running direction (arrow B direction) of the grinding endless belt 12 at the contact position with the grinding endless belt 12 is bent by about 90 °. The end portion 34 a is held by the pressing block 28 (or the cushion material 32) by the fixing plate 36, and the fixing plate 36 is fixed by screwing a bolt 38 into the screw hole 40 of the pressing block 28. .

  In the protective sheet member 34, the end 34 b on the downstream side in the running direction of the grinding endless belt 12 at the position of contact with the grinding endless belt 12 protrudes outward in the arrow B direction from the pressing block 28 and the cushion material 32. The end portion 34b is inclined upward and is configured as a free end.

  The operation of the grinding apparatus 10 configured as described above will be described below.

  First, as shown in FIG. 1, the pressing block 28 presses the inner peripheral surface of the grinding endless belt 12 so as to bend toward the workpiece W between the pulleys 14a and 14c. For this reason, the endless belt 12 for grinding is pressed against the work W side over the region (planar region) pressed by the pressing block 28 and comes into contact with the weld bead Wb.

  Then, the motor 24 is driven, and the driven pulley 18 is rotated in the direction of the arrow through the driving pulley 20 and the belt 22. Therefore, the pulley 14a coaxially integrated with the driven pulley 18 rotates in the direction of the arrow. The pulleys 14a, 14b and 14c are looped around the endless belt 12 for grinding. The pulley 14a rotates in the direction of the arrow so that the endless belt 12 for grinding runs around.

  Thereby, the endless belt 12 for grinding grinds the weld bead Wb of the workpiece W on the outer peripheral surface pressed by the pressing block 28. At that time, the grinding device 10 and the workpiece W relatively move along the shape of the weld bead Wb. Accordingly, the grinding endless belt 12 is ground over the entire circumference of the weld bead Wb.

  In this case, in the first embodiment, the pressing block 28 is disposed on the inner peripheral surface of the grinding endless belt 12 so as to oppose the pressing position to the weld bead Wb, and the pressing block 28 is used for the grinding. The end surface shape that presses the inner peripheral surface of the endless belt 12 is set to a quadrangular shape.

  For this reason, in the endless belt 12 for grinding, the contact portion with the weld bead Wb has a quadrangular shape (planar shape), and it is possible to prevent as much as possible the occurrence of a dent in the workpiece W after grinding. Moreover, since the end surface of the pressing block 28 has a quadrangular shape, as shown in FIG. 3, even if the relative position between the pressing block 28 and the weld bead Wb is shifted within the range of the distance S, the grinding direction and the grinding area In addition, the grinding conditions such as the grinding angle do not vary, and uniform grinding can be performed.

  Thereby, the grinding apparatus 10 has an effect of being able to grind the weld bead Wb of the workpiece W with high accuracy and easily with a compact and economical configuration.

  In addition, since the grinding endless belt 12 rotates for a long time from the grinding point, the frictional heat is well removed. Therefore, the grinding endless belt 12 is easily cooled, and the degree of wear of the abrasive is reduced, so that the grinding quality can be stably maintained.

  Furthermore, in 1st Embodiment, the cushioning material 32 is provided in the press block 28 made from steel corresponding to the contact side end surface with the endless belt 12 for grinding. For this reason, vibration generated during grinding by the grinding endless belt 12 can be satisfactorily absorbed through the cushion material 32.

  Furthermore, a protective sheet member 34 is interposed between the cushion material 32 and the inner peripheral surface of the grinding endless belt 12. The protective sheet member 34 is excellent in heat resistance and wear resistance, and can well protect the cushion material 32 and the endless belt 12 for grinding.

  Moreover, the protective sheet member 34 has an end 34a on the upstream side in the traveling direction fixed to the pressing block 28 (or the cushion material 32) via the fixing plate 36, while an end 34b on the downstream side in the traveling direction is free. Configured at the end. Accordingly, when the cushion material 32 is elastically deformed, the protective sheet member 34 is deformed via the end portion 34b which is a free end, and it is possible to favorably avoid damage to the protective sheet member 34. By setting the end portion 34b, which is a free end, on the downstream side in the running direction, the elastic deformation of the cushion material 32 can be allowed, and the durability of the protective sheet member 34 can be further improved.

  In addition to the resin, the protective sheet member 34 can be made of silicon, a thin iron tape member, or the like.

  Further, the pulley 14 b can be advanced and retracted in the direction of arrow A via the cylinder 26. Therefore, when elongation occurs in the grinding endless belt 12 itself, the tension of the grinding endless belt 12 can be adjusted by moving the pulley 14b upward. Also, the pulley 14b is moved upward to reduce the contact width between the grinding endless belt 12 and the weld bead Wb, or the pulley 14b is moved downward to cause the grinding endless belt 12 and the weld bead Wb to contact each other. It is also possible to increase the contact width. That is, the grinding width of the endless belt 12 for grinding can be adjusted.

  FIG. 4 is an explanatory perspective view of a main part of a grinding device 50 according to the second embodiment of the present invention. Note that the same components as those of the grinding apparatus 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The grinding device 50 includes a pressing block 52, and the pressing block 52 has a substantially trapezoidal shape when viewed from the front. In the pressing block 52, the end surface shape that presses the inner peripheral surface of the grinding endless belt 12 is set to a square shape.

  Therefore, in the second embodiment configured as described above, the same effect as in the first embodiment can be obtained. In the second embodiment, the pressing block 52 is configured in a substantially trapezoidal shape when viewed from the front. However, the present invention is not limited to this, and it is sufficient that at least the end surface shape is set to a square shape. The shape can be set.

  In the first and second embodiments, the case where the weld bead Wb of the workpiece W is ground as the protruding portion has been described. However, the present invention is not limited to this. For example, the same can be applied to the case of removing a flash of a workpiece manufactured by a casting process.

DESCRIPTION OF SYMBOLS 10, 50 ... Grinding device 12 ... Endless belt 14a, 14b, 14c for grinding | pulling 16 ... Frame 16 ... Frame member 22 ... Belt 24 ... Motor 26 ... Cylinder 28, 52 ... Press block 32 ... Cushion material 34 ... Protection sheet member 34a, 34b ... End 36 ... Fixing plate

Claims (3)

A grinding device that grinds the protruding portion by causing the endless belt for grinding to run around while pressing the protruding portion,
First to third pulleys arranged at triangular vertices;
The endless belt for grinding suspended from the first to third pulleys;
A rotational drive source that drives the first pulley and drives the second and third pulleys;
Means for pulling the endless belt for grinding in one direction and adjusting the tension of the endless belt for grinding via the second pulley;
The endless belt for grinding is disposed on the inner peripheral surface of the endless belt for grinding so as to oppose the pressing position against the protruding portion, and the inner peripheral surface of the endless belt for grinding is other than A grinding apparatus comprising a pressing block in which an end face shape to be pressed in a direction is set to a square shape. The grinding apparatus according to claim 1, wherein the pressing block is provided with a cushion material on a contact side end surface with the endless belt for grinding,
Between the cushion material and the inner peripheral surface of the endless belt for grinding, a protective sheet member is interposed,
The protective sheet member has an end on the upstream side in the traveling direction of the endless belt for grinding at a position in contact with the endless belt for grinding, and is fixed to at least one of the pressing block or the cushion material, and the endless for grinding A grinding apparatus characterized in that an end portion on the downstream side in the running direction of the endless belt for grinding at a contact position with the belt is configured as a free end.   The grinding apparatus according to claim 1, wherein the protruding portion is a weld bead.

Images