Dressing method and dressing device

Abstract

To provide a dressing method and a dressing device that can efficiently dress a grinding member.SOLUTION: The dressing method is for a grinding member (4) including abrasive grains and a binder for binding the abrasive grains, and comprises: a dressing step of causing the grinding member (4) and a dressing member (5) to collide with each other. In the dressing step, the dressing method may cause the grinding member to collide with the dressing member (5) having a hardness higher than that of the grinding member (4) based on a bonding degree of the abrasive grains by the binder.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a dressing method and a dressing device, and more particularly to a dressing method and a dressing device that eliminate clogging, dulling, etc. of a grinding member that includes abrasive grains and a binder that binds the abrasive grains, and improve the grinding ability of the grinding member. [Background technology]

[0002] In grinding, defects in metal materials such as steel are removed using grinding members such as grinding wheels. The grinding members used in grinding can become clogged with chips, causing pores to become blocked, or the cutting edges of the abrasive grains to wear down and become dull. Because clogging and dulling reduce grinding performance and cause poor surface finishes, a dressing operation is required to prepare the working surface of the grinding member and make it appear dull.

[0003] Here, as a technique for dressing grinding members such as grinding wheels, for example, Patent Document 1 discloses a technique for dressing the tip working surface of the grinding wheel to the same shape as the groove shape of the roller by pressing the tip working surface of the grinding wheel against the groove of the roller. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-346844 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the grinding wheel is rotated, and a roller serving as a dressing element is rotated in the opposite direction to the grinding wheel, pressing the working surface of the grinding wheel against the dressing element to correct the shape and dress the working surface of the grinding wheel. With this method, the dressing effect of the grinding element may be reduced depending on the relationship between the material, grain size, shape, etc. of the grinding wheel and the dressing element. For example, if the dressing element is too hard relative to the grinding wheel, the abrasive grains may not fall off easily, resulting in wear and tear, which may worsen dulling and clogging. On the other hand, if the dressing element is too hard relative to the grinding wheel, the surface shape of the contact surface of the dressing element may change due to wear, resulting in an uneven dressing effect. Therefore, a dressing method different from the conventional method of dressing the working surface of the grinding element using rotational force is needed.

[0006] In view of the above circumstances, an object of the present disclosure is to provide a dressing method and a dressing device that can efficiently dress a grinding member. [Means for solving the problem]

[0007] (1) A dressing method according to an embodiment of the present disclosure includes: A method for dressing a grinding member containing abrasive grains and a binder that binds the abrasive grains, comprising: The method includes a dressing step of causing the grinding member to collide with a dressing member.

[0008] (2) As one embodiment of the present disclosure, in (1), In the dressing step, the grinding member is caused to collide with a dressing member having a hardness higher than the hardness of the grinding member based on the degree of bonding of the abrasive grains by the binder.

[0009] (3) As one embodiment of the present disclosure, in (2), In the dressing process, the collision speed between the grinding member and the dressing member is set based on actual data from trials in which the hardness of the grinding member and the hardness of the dressing member are variously combined so that the cumulative grinding amount when grinding is performed using the dressed grinding member is equal to or greater than a predetermined grinding amount.

[0010] (4) As an embodiment of the present disclosure, in (3), The predetermined grinding amount is equal to or greater than 70% of the cumulative grinding amount of unused grinding members.

[0011] (5) As an embodiment of the present disclosure, in any one of (1) to (4), a changing step of changing a contact surface of the grinding member when the grinding member collides with the dressing member, The dressing step and the changing step are repeated to dress the entire working surface of the grinding member.

[0012] (6) A dressing device according to an embodiment of the present disclosure, A dressing device for a grinding member including abrasive grains and a binder that binds the abrasive grains, a dressing member; and a drive control device that causes the grinding member and the dressing member to collide with each other. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to provide a dressing method and a dressing device that can efficiently dress a grinding member. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing the overall configuration of a dressing device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram showing the state before and after collision of a dressing device in a dressing method according to an embodiment of the present disclosure. [Figure 3]FIG. 3 is a diagram showing the grinding member and the dressing member before and after collision in a dressing method according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a diagram showing the relationship between the ratio of the grinding amount of the dressed grinding member to the grinding amount of the unused grinding member and the operating speed in the examples. [Figure 5] FIG. 5 is a diagram showing the relationship between the ratio of the grinding amount of the dressed grinding member to the grinding amount of the unused grinding member and the number of collisions in the examples. [Figure 6A] FIG. 6A is a diagram illustrating an example of changing the contact surface. [Figure 6B] FIG. 6B is a diagram illustrating another example of changing the contact surface. DETAILED DESCRIPTION OF THE INVENTION

[0015] A dressing method and a dressing apparatus 1 (see FIG. 1) according to one embodiment of the present disclosure will be described below with reference to the drawings. In each drawing, identical or corresponding parts are designated by the same reference numerals. In the description of this embodiment, the description of identical or corresponding parts will be omitted or simplified as appropriate.

[0016] (Device configuration) Fig. 1 shows the overall configuration of a dressing device 1 according to this embodiment. The dressing device 1 dresses a grinding member 4. As shown in Fig. 1, the dressing device 1 includes a dressing member 5 (collision member) against which the grinding member 4 collides, and a drive control device 10 that causes the grinding member 4 and the dressing member 5 to collide with each other.

[0017] The drive control device 10 drives the movable part 9 along the movable axis (a vertical axis parallel to the longitudinal direction in FIG. 1 ) and controls the movable length 8 (see FIG. 2 ) of the movable part 9, i.e., the movement amount and moving speed V (see FIG. 2 ) of the movable part 9 along the movable axis. As will be described later, the drive control device 10 can also drive the movable part 9 in a direction perpendicular to the movable axis (a tangential direction of the grinding member 4). A grinding tool 3 is attached to the movable part 9 via an extension / retraction mechanism 2. A grinding member 4 is attached to the tip of the grinding tool 3 so as to be rotatable about a rotation axis. The rotation axis is the cylindrical axis of the cylindrical grinding member 4, which extends horizontally in the example of FIG. 1 . The grinding member 4 is, for example, a grinding wheel composed of abrasive grains bonded together by a binder. The grinding member 4 is not limited to a grinding wheel, but may be any member that contains at least abrasive grains and a binder that bonds the abrasive grains and requires dressing.

[0018] The dressing member 5 may be any member that can be used to dress the grinding member 4, and there are no limitations on the material or shape. In the present embodiment, the dressing member 5 is, for example, a block- or rod-shaped member with a flat collision surface (top surface) with the grinding member 4. From the viewpoint of dressing the grinding member 4, it is preferable that the dressing member 5 be a member with a hardness higher than that of the grinding member 4. Here, the hardness of the grinding member 4 is determined based on the degree of bonding of the abrasive grains with the binder. For example, when the grinding member 4 is a general grinding wheel used to grind steel, a block material made of diamond or the like is suitable for the dressing member 5. Here, the degree of bonding of the abrasive grains with the binder may be represented by, for example, a bonding index of A to Z.

[0019] Here, the dressing device 1 may include a database 11. The drive control device 10 may be configured to acquire necessary information from the database 11. The database 11 stores the results of trials in which various combinations of the hardness of the grinding member 4 and the hardness of the dressing member 5 are used (for example, measurement data such as those shown in FIGS. 4 and 5, which will be described later) as performance data. The trials are experiments carried out before dressing is performed by the dressing device 1.

[0020] (Dressing method) The dressing method performed by the dressing device 1 is described below. The dressing method includes a dressing step in which the grinding member 4 and the dressing member 5 are collided with each other. In the dressing step, the grinding member 4 is collided with the dressing member 5, which has a harder hardness than the grinding member 4, which is based on the degree of bonding of the abrasive grains by the binder. The dressing method may also include a changing step in which the contact surface of the grinding member 4 when it collides with the dressing member 5. In this embodiment, the dressing method can dress the entire use surface 6 (see FIG. 2) of the grinding member 4 by repeating the dressing step and the changing step.

[0021] (Dressing process) Figure 2 shows the states of the dressing device 1 before and after collision in the dressing method according to this embodiment. In the example of Figure 2, it is assumed that the working surface 6 of the grinding member 4, which has become clogged, is being dressed. Here, the working surface 6 is the surface of the grinding member 4 that is used in grinding, i.e., the surface that comes into contact with the workpiece.

[0022] In the dressing method according to this embodiment, the dressing member 5 is positioned on the movable shaft of the movable part 9 of the dressing device 1. As shown in Fig. 2, the movable part 9 is driven along the movable shaft by the drive control device 10, and the use surface 6 (lower surface) of the grinding member 4 attached to the movable part 9 collides with the dressing member 5. The impact of the collision crushes clogged areas, abrasive grains, binder, etc. on the use surface 6 of the grinding member 4, thereby opening up the grinding member 4.

[0023] In the dressing device 1 according to this embodiment, the grinding member 4 is moved toward the dressing member 5, thereby causing the grinding member 4 and the dressing member 5 to collide with each other. As another example, the dressing device 1 may be configured to move the dressing member 5 toward the grinding member 4, thereby causing the grinding member 4 and the dressing member 5 to collide with each other.

[0024] As shown in FIG. 2, the drive control device 10 drives the movable part 9 to move the grinding tool 3 toward the dressing member 5 at a movable speed V. More specifically, the drive control device 10 sets the movable length 8 of the movable part 9 to be greater than the distance 7 from the use surface 6 of the grinding member 4 to the collision surface (upper surface) of the dressing member 5, thereby bringing the entire lower surface of the grinding member 4 into contact with the dressing member 5. After the grinding member 4 and the dressing member 5 come into contact, the extension / contraction mechanism 2 contracts, thereby absorbing the pressing force from the movable part 9.

[0025] With the above-described configuration of the dressing device 1, the drive control device 10 can accurately control the impact when the grinding member 4 and the dressing member 5 collide with each other by the moving speed V of the movable part 9. The moving speed V is the movement speed of the movable part 9 and also the collision speed of the grinding member 4 with the dressing member 5. Figure 3 is a diagram showing the grinding member 4 and the dressing member 5 before and after the collision. The impact of the collision between the grinding member 4 and the dressing member 5 occurs the moment the grinding member 4 and the dressing member 5 come into contact with each other. The energy conservation equation before and during the collision is expressed by the following equation (1).

[0026]

number

[0027] Here, the moving speed V is the moving speed of the movable part 9 before the collision as described above. M is the weight including the grinding tool 3 and the grinding member 4. E is the longitudinal elastic modulus of the grinding member 4. L is the longitudinal length of the grinding member 4. The contact area A is the area of ​​the contact surface when the grinding member 4 collides with the dressing member 5. λ is the amount of deformation of the grinding member 4 upon collision. Here, equation (1) ignores the local stress at the collision area and assumes that the grinding member 4 elastically deforms upon collision. By solving equation (1) for λ, the impact stress σ is expressed by the following equation (2).

[0028]

number

[0029] According to Equation (2), the impact stress σ increases as the moving speed V of the movable part 9 increases. Furthermore, the impact stress σ increases as the contact area A decreases. The contact area A is determined by the diameter of the grinding member 4 or the size of the dressing member 5, making it difficult to adjust. Therefore, in this embodiment, the drive control device 10 sets the moving speed V (impact speed) according to the hardness of the grinding member 4 and the hardness of the dressing member 5 so as to achieve an impact stress σ effective for crushing the binder of the grinding member 4. Here, the drive control device 10 can set the moving speed V to a constant speed (a speed that does not change during the movement of the movable part 9) so as to obtain the desired impact stress σ calculated according to Equation (2). The drive control device 10 may also set the number of collisions so as to achieve an impact stress σ effective for crushing the binder of the grinding member 4.

[0030] FIG. 4 is a diagram showing the relationship between the ratio of the grinding amount of the dressed grinding member to the grinding amount of the unused grinding member and the operating speed V in the examples. The unused grinding member is a grinding member 4 that has never been used. The dressed grinding member is a grinding member 4 after dressing has been performed. The examples are part of a trial in which various combinations of the hardness of the grinding member 4 and the hardness of the dressing member 5 were used, and in this embodiment, the results of the trials, including the examples, are stored as performance data in database 11.

[0031] In this embodiment, a grinding wheel (an example of the grinding member 4) having a bond index of P is placed at a distance of about 100 mm. 2 The dressing was performed by colliding the grinding wheel with the dressing member 5 at a contact area A. In FIG. 4, the cumulative grinding amount X of the grinding wheel after dressing is compared with the cumulative grinding amount X of the unused grinding wheel. d The results of changing the moving speed V are shown for the ratio of the above. When the moving speed V is 30cm / s and 40cm / s, the above ratio (X d In order to crush the binder by collision and obtain the effect of exposing the grinding wheel, a certain level of impact stress σ is required, and this shows that in this example, the moving speed V needs to be set faster than about 30 cm / s.

[0032] Also, Figure 5 shows the above ratio (X d The results of changing the number of collisions for (X / X0) are shown below. When the number of collisions is 2, (X d / X0) is increasing. Also, when the number of collisions is 2 and 3, (X d It can be seen that the cracks in the first collision were removed in the second collision, resulting in the appropriate opening.

[0033] The drive control device 10 calculates the cumulative grinding amount X when grinding is performed using the grinding member 4 (grindstone) after dressing in the dressing process. d The collision speed (i.e., the moving speed V) between the grinding member 4 and the dressing member 5 is set so that the cumulative grinding amount X is equal to or greater than a predetermined grinding amount. The drive control device 10 may set the number of collisions in addition to the collision speed. As described above, the cumulative grinding amount X d is the cumulative grinding amount when grinding is performed using the dressed grinding member 4, and corresponds to the life of the dressed grinding member 4. Also, the cumulative grinding amount X0 is the cumulative grinding amount when grinding is performed using an unused grinding member 4, and corresponds to the life of the unused grinding member 4. d It is preferable to set the collision speed and the number of collisions of the grinding member 4 with the dressing member 5 so that the cumulative grinding amount X0 is equal to or greater than a predetermined grinding amount, that is, so that the life after dressing is equal to or greater than a certain ratio of the life before use. Here, the predetermined grinding amount is, for example, equal to or greater than 70% of the cumulative grinding amount X0 of the unused grinding member 4.

[0034] As described above, the impact stress σ effective for crushing the binder of the grinding member 4 varies depending on the hardness of the grinding member 4 and the hardness of the dressing member 5. Therefore, the drive control device 10 may acquire from the database 11 performance data of trials in which the hardness of the grinding member 4 and the hardness of the dressing member 5 are variously combined, and set the collision speed between the grinding member 4 and the dressing member 5 based on the performance data. For example, when the information shown in FIGS. 4 and 5 is obtained from the performance data, the drive control device 10 may set the above-mentioned ratio (X d The collision speed may be set to 30 cm / s and the number of collisions may be set to two so that the ratio of the collision time to the total collision time is 70% or more.

[0035] (Change process) The impact stress σ acts on the contact surface at the time of collision. Therefore, in order to dress the entire use surface 6 of the grinding member 4, it is necessary to change the surface of the use surface 6 that collides (contact surface).

[0036] When the grinding member 4 is collided with the dressing member 5 in a non-rotating state, as shown in FIG. 6A, the movable part 9 moves the grinding member 4 in the tangential direction while the grinding member 4 is in contact with the dressing member 5 after the collision. This movement causes the grinding member 4 to rotate, so that the contact surface can be changed. By repeating the movement in the tangential direction, the drive control device 10 can control the grinding member 4 so that the entire use surface 6 becomes the contact surface.

[0037] In addition, when the grinding member 4 is caused to collide with the dressing member 5 in a rotating state, as shown in FIG. 6B, the collision period T I The collision operation is repeated at this rate. The collision period T is calculated using the angular velocity ω of the rotation of the grinding member 4 and the phase angle θ of the rotation of the grinding member 4 from one collision to the next. I is expressed by the following equation (3).

[0038]

number

[0039] That is, at the next collision, the grinding member 4 has rotated by the phase angle θ, so that the contact surface is changed. I By appropriately setting the phase angle δ, the entire use surface 6 of the grinding member 4 can be controlled to become the contact surface. In this way, whether the grinding member 4 is in a non-rotating state or a rotating state, the dressing method according to this embodiment dresses the entire use surface 6 of the grinding member 4 by repeating the dressing step and the contact surface changing step. Here, θ can be a value exceeding 360°. When θ is expressed as "360° × n + δ" where n is an integer greater than or equal to 1, the drive control device 10 may treat the grinding member 4 as having rotated by the phase angle δ at the next collision and control the entire use surface 6 of the grinding member 4 to become the contact surface.

[0040] (Action and effect) The dressing method and dressing device 1 according to this embodiment crush clogged areas, abrasive grains, binder, etc. on the use surface 6 of the grinding member 4 by the impact when the use surface 6 of the grinding member 4 collides with the dressing member 5, thereby dressing the grinding member 4. Therefore, even when the combinations of materials, grain size, shape, etc. of the grinding member 4 and the dressing member 5 are different, the grinding member 4 can be dressed efficiently, for example, by simply adjusting the operating speed V. Furthermore, the dressing method and dressing device 1 according to this embodiment automate the dressing operation of the grinding member 4, enabling more efficient dressing of the grinding member 4 (removal of abrasive grains and dressing).

[0041] Although the embodiments of the present disclosure have been described based on the drawings and examples, it should be noted that those skilled in the art would easily be able to make various modifications or alterations based on the present disclosure. Therefore, it should be noted that these modifications and alterations are included within the scope of the present disclosure. For example, the functions included in each component or step can be rearranged so as not to cause logical inconsistencies, and multiple components or steps can be combined or divided into one. The embodiments of the present disclosure can also be realized as a program executed by a processor included in an apparatus or a storage medium on which a program is recorded. It should be understood that these are also included within the scope of the present disclosure. [Explanation of symbols]

[0042] 1 Dressing device 2 Telescopic mechanism 3 Grinding tools 4 Grinding material 5 Dressing material 6 Usage surface 7 distance 8. Movable length 9 Moving parts 10 Drive control device 11 Database

Claims

1. A method for dressing a grinding member containing abrasive grains and a binder that binds the abrasive grains, comprising: A dressing method including a dressing step of causing the grinding member to collide with a dressing member.

2. 2. The dressing method according to claim 1, wherein the dressing step includes colliding the grinding member with a dressing member having a hardness higher than the hardness of the grinding member based on the degree of bonding of the abrasive grains by the binder.

3. 3. The dressing method according to claim 2, wherein in the dressing process, the collision speed between the grinding member and the dressing member is set based on actual data from trials in which the hardness of the grinding member and the hardness of the dressing member are variously combined so that the cumulative grinding amount when grinding is performed using the dressed grinding member is equal to or greater than a predetermined grinding amount.

4. 4. The dressing method according to claim 3, wherein the predetermined grinding amount is at least 70% of the cumulative grinding amount of unused grinding members.

5. a changing step of changing a contact surface of the grinding member when the grinding member collides with the dressing member, The dressing method according to claim 1 , wherein the entire working surface of the grinding member is dressed by repeating the dressing step and the changing step.

6. A dressing device for a grinding member including abrasive grains and a binder that binds the abrasive grains, a dressing member; a drive control device that causes the grinding member and the dressing member to collide with each other.

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