METHOD FOR PRODUCE A FINISHED PRODUCT
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- NGK INSULATORS LTD
- Filing Date
- 2017-07-21
- Publication Date
- 2026-07-02
AI Technical Summary
Existing methods for grinding polygonal or cylindrical objects to reduce their diameter are limited by narrow grinding wheel width, leading to slow processing times due to restricted axial movement speeds, even at high rotational speeds.
A cup grinding wheel with a side grinding wheel part and a lower grinding wheel part is used, where the lower part has finer abrasive grains, and the wheel is axially rotated while the object is moved, allowing both parts to grind the object simultaneously, with the side part for rough grinding and the lower part for fine grinding.
This method significantly shortens processing time and reduces the likelihood of chipping by using a cup grinding wheel with a rounded boundary between grinding parts and an annular lower part for efficient and smooth grinding.
Abstract
Description
Technical field
[0001] The present invention relates to a method for producing a ground product and a cup grinding wheel. State of the art
[0002] For example, a manufacturing process disclosed in PTL 1 is known as a method for producing a cylindrical body by grinding the side surface of a polygonal columnar or cylindrical grinding object to produce a cylindrical body with a smaller diameter than that of the grinding object. Fig. As shown in Figure 14, PTL 1 discloses a method for producing a cylindrical honeycomb structure. 230 by machining the outer circumference of a polygonal-columnar honeycomb structure made of porous ceramic 220 using a wheel-shaped grinding wheel 210 with an abrasive grain layer on its side surface. List of printed materials and patent literature
[0003] PTL 1: Japanese unexamined patent application publication no. 2006-320806 Brief description of the invention: Technical problem
[0004] However, the procedure can be used to… Fig. 14, since the width w of the grinding wheel 210 narrow, the speed of axial movement of the honeycomb structure 220 cannot be increased if the axial speed of the grinding wheel 210 and the axial rotational speed of the honeycomb structure 220 not increased. Furthermore, even if the grinding wheel 210 and the honeycomb structure 220 rotating at a high speed is a limiting factor, making it difficult to reduce the machining time sufficiently.
[0005] The present invention was made to solve such problems, and a main objective of the present invention is to reduce the processing time for grinding a grinding object into a ground product. Problem solving
[0006] The method for producing a ground product of the present invention is a method for producing a ground product with a smaller diameter than that of a grinding object by grinding the side surface of the grinding object having a polygonal columnar or cylindrical shape and comprises the following steps: (a) Arranging a cup grinding wheel comprising a lateral grinding wheel portion arranged on the side face of a cup and a lower grinding wheel portion arranged on the lower side of the cup such that the central axis of the cup grinding wheel is orthogonal to the central axis of the grinding object, or such that the central axis of the cup grinding wheel is offset parallel from a state in which the central axis of the cup grinding wheel is orthogonal to the central axis of the grinding object, and (b) axially rotating the cup grinding wheel so that the cup grinding wheel grinds the side surface of the grinding object while the grinding object is axially rotated and moved in the axial direction, thereby fine grinding the outer circumferential surface of the grinding object with the lower grinding wheel part while simultaneously coarse grinding the grinding object with the side grinding wheel part to obtain the ground product.
[0007] In this manufacturing process, the outer circumferential surface of the workpiece is finely ground by the lower grinding wheel portion, while the workpiece itself is coarsely ground by the side grinding wheel portion to obtain a finished product with a smaller diameter than the workpiece. In other words, this manufacturing process grinds the workpiece using both the side and lower grinding wheel portions. Therefore, the processing time can be reduced compared to the conventional method, where the workpiece is ground using a wheel-shaped grinding wheel with an abrasive grain layer on its side surface.
[0008] In the manufacturing process of the present invention, it is preferred that in step (a) the cup grinding wheel used is one in which the abrasive grains of the lower grinding wheel part are finer than those of the side grinding wheel part. Thus, the coarse grinding of the workpiece can be carried out effectively using the side grinding wheel part, and the fine grinding of the workpiece can be carried out gently using the lower grinding wheel part.
[0009] In the manufacturing process of the present invention, it is preferable that in step (a) the cup grinding wheel used is one in which the boundary between the side grinding wheel part and the lower grinding wheel part is rounded. Thus, the boundary between the surface coarsely ground by means of the side grinding wheel part and the surface of the grinding object finely ground by means of the lower grinding wheel part is not angular but rounded, and therefore chipping of the ground product is less likely.
[0010] In the manufacturing process of the present invention, it is preferred that in step (a) the cup grinding wheel used is one in which the lower grinding wheel portion is arranged annularly along the outer circumference of the lower side of the cup. Although the lower grinding wheel portion can also be arranged over the entire lower side of the cup, it is preferable, in view of easier attachment to and removal from the grinding device, that the lower grinding wheel portion is arranged annularly rather than over the entire lower side.
[0011] In the manufacturing process of the present invention, it is preferred that in step (a) the central axis of the cup grinding wheel is offset parallel to the central axis of the grinding object, starting from a state in which the central axis of the cup grinding wheel is orthogonal to the central axis of the grinding object, and the central axis of the cup grinding wheel is offset such that, when the central axis of the grinding object is projected onto the lower grinding wheel part of the cup grinding wheel, a single straight segment appears on the lower grinding wheel part, and such that the length of the straight segment is greater than or equal to Lmax / 2 and less than or equal to Lmax (Lmax is the length of the straight segment when the offset is carried out such that the straight segment is a tangent touching the inner circumference of the lower grinding wheel part).Thus, the length of the straight segment (part of the lower grinding wheel section used for fine grinding, working width) is greater than in the case where, when the central axis of the workpiece is projected onto the lower grinding wheel section, two straight segments appear on the lower grinding wheel section. Therefore, the speed at which the workpiece is moved axially can be increased, and the processing time can be further reduced. Furthermore, because the boundary between the surface coarsely ground by the side grinding wheel section and the surface finely ground by the lower grinding wheel section has a more gently rounded shape, chipping or similar defects are less likely to occur on the ground product.
[0012] In the manufacturing process of the present invention, the grinding object is not particularly limited; rather, it is preferably a ceramic structure. Such a structure can be a fired body or a shaped body (structure before firing), can be a non-solid body with a cavity therein, or can be a solid body. Examples of non-solid bodies include a cylindrical body and a honeycomb structure, with a honeycomb structure being preferred. Specific examples of honeycomb structures include a honeycomb structure in which a plurality of cells are not closed (for example, a catalyst support), and a honeycomb structure in which cells, one end of which is closed and the other end of which is open, and cells, one end of which is open and the other end of which is closed, are arranged alternately (for example, a diesel particulate filter (DPF)).
[0013] The cup grinding wheel of the present invention comprises a lateral grinding wheel part arranged on the side surface of a cup and a lower grinding wheel part arranged on the lower side of the cup, which has a finer abrasive grain size than the lateral grinding wheel part.
[0014] This cup grinding wheel is suitable for the manufacturing process described above, that is, the process in which the outer circumferential surface of the grinding object is finely ground using the lower grinding wheel part, while the grinding object is coarsely ground using the side grinding wheel part.
[0015] In the cup grinding wheel of the present invention, it is preferable that the boundary between the lateral grinding wheel portion and the lower grinding wheel portion is rounded. Thus, the boundary between the surface coarsely ground by means of the lateral grinding wheel portion and the surface of the grinding object finely ground by means of the lower grinding wheel portion is not angular but rounded, and therefore chipping of the ground product is less likely.
[0016] In the cup grinding wheel of the present invention, it is preferred that the lower grinding wheel portion is arranged in a ring shape along the outer circumference of the lower side of the cup. Although the lower grinding wheel portion can also be arranged over the entire lower side of the cup, it is preferable, in view of easier attachment to and removal from the grinding device, that the lower grinding wheel portion is arranged in a ring shape rather than over the entire lower side. List of characters Fig. Figure 1 is an explanatory drawing which illustrates a process of manufacturing a polished product. 20 from a grinding object 10 shows. Fig. 2 is a top view showing a state in which the grinding object 10 with a cup grinding wheel 30 is being sanded. Fig. 3 is a sectional view along a line AA in Fig. 2. Fig. 4 is the repositioning of the cup grinding wheel 30 Explanatory drawing based on the reference state. Fig. 5 is the repositioning of the cup grinding wheel 30 Explanatory drawing based on the reference state. Fig. Figure 6 is an explanatory drawing illustrating the process of manufacturing a DPF. 120 from a honeycomb structure 110 shows. Fig. Figure 7 is a perspective view of a honeycomb element. 50 . Fig. 8 is a sectional view along a line BB in Fig. 7. Fig. Figure 9 shows the dimensions of one in experimental examples. 1 and 2 used cup grinding wheel 30 . Fig. Figure 10 is a perspective view showing a state during the grinding process in the experimental example. 3 shows. Fig.Figure 11 is a perspective view showing the boundary between the roughly ground surface and the finely ground surface during grinding in the experimental example. 3 shows. Fig. Figure 12 is a perspective view showing a state during grinding in the experimental example. 4 shows. Fig. Figure 13 is a perspective view showing the boundary between the roughly ground surface and the finely ground surface during grinding in the experimental example. 4 shows. Fig. Figure 14 is an explanatory drawing illustrating a conventional process for manufacturing a cylindrical honeycomb structure. 230 shows. DESCRIPTION OF EXECUTION FORMS
[0017] A preferred embodiment of the present invention will now be described with reference to the drawings. Fig.Figure 1 is an explanatory drawing illustrating the manufacturing process of a polished product. 20 shows, Fig. 2 is a top view showing a state in which a grinding object is 10 with a cup grinding wheel 30 is ground, and Fig. 3 is a sectional view along a line AA in Fig. 2. In the following description, the terms "above", "below", "left", "right", "front" and "back" may appear, their directions as in the Fig. 2 and Fig. 3 shown.
[0018] In this embodiment, as in Fig. Figure 1 shows a case in which the side surface of a ceramic, octagonal-columnar grinding object is described. 10 It is ground to produce a cylindrically ground product. 20 with a smaller diameter than that of the grinding object 10 to produce.
[0019] One in the Fig.2 and Fig. 3 cup grinding wheels shown 30 is done before the production of the polished product 20 manufactured. The cup grinding wheel 30 contains a metal pot 32 with a through hole 34 along the central axis 30a , one on the side of the pot 32 arranged lateral grinding wheel part 36 and one on the bottom of the pot 32 arranged lower grinding wheel part 38 . The border 37 between the side grinding wheel part 36 and the lower grinding wheel part 38 is rounded. The radius of curvature of the boundary 37 is not particularly limited, but is, for example, 3 to 10 mm. The lower part of the grinding wheel 38 is ring-shaped along the outer circumference of the lower side of the pot 32 arranged. The lateral grinding wheel part 36and the lower grinding wheel part 38 Both are diamond grinding wheels and can have the same abrasive grain size, but the abrasive grain size of the lower part of the grinding wheel differs. 38 is preferably finer than that of the lateral grinding wheel part 36 The abrasive grain size is not particularly limited; for example, the abrasive grain size is [missing information] when the lateral grinding wheel part [missing information]. 36 and the lower grinding wheel part 38 have the same abrasive grain size, preferably 60 / 80 to 270 / 325, and if the abrasive grain size of the lower grinding wheel part 38 finer than that of the side grinding wheel part 36 It is preferable that the abrasive grain size of the lateral grinding wheel part 36 60 / 80 until 100 / 120 is and the abrasive grain size of the lower grinding wheel part 38 120 / 140 until 270 / 325 The abrasive grain size in this description is based on JIS B 4130.
[0020] The cup grinding wheel 30 is accessed via a through hole 34 rotatably mounted on a grinding device (for example, a machining center) (not shown) such that the central axis 30a lies in the vertical direction. The grinding object 10 It is attached to the grinding device in such a way that the central axis 10a The grinding object lies horizontally in the direction from front to back. 10 It is mounted in such a way that it can rotate axially around the axis and move in the axial direction. The rotational speed of the cup grinding wheel 30 and the rotational speed and the speed of movement of the grinding object 10 can be adjusted.
[0021] Then the following steps (a) and (b) are carried out in this order to prepare the ground product. 20from the grinding object 10 to produce. Step (a)
[0022] First, the cup grinding wheel is used. 30 arranged so that the side surface of the grinding object 10 to the central axis 10a It can be ground down. That is, the cup grinding wheel 30 is adjusted so that the flat surface of the lower grinding wheel part 38 the cup grinding wheel 30 around the radius of the ground product 20 above the central axis 10a of the grinding object 10 lies. At the same time, the cup grinding wheel is 30 so that the central axis 30a the cup grinding wheel 30 in a predetermined positional relationship to the central axis 10a of the grinding object 10 is located. In the Fig. 2 and Fig. 3 is a state in which the cup grinding wheel 30 is arranged such that the central axis30a the cup grinding wheel 30 orthogonal to the central axis 10a of the grinding object 10 The reference state is represented by a dashed-dotted line. The cup grinding wheel is derived from this reference state. 30 so offset that the central axis 30a the cup grinding wheel 30 is shifted a predetermined distance to the left. The predetermined distance (the offset amount) can be within a range in which the lower grinding wheel part 38 and the central axis 10a of the grinding object 10 each other in Fig. 2 cut, be adjusted appropriately. Step (b)
[0023] After the grinding object 10 and the cup grinding wheel 30 as described above, the cup grinding wheel 30 allowed to rotate axially, so that the cup grinding wheel 30 the side surface of the grinding object 10grinds while the grinding object 10 The workpiece is allowed to rotate axially and be moved forward along the axial direction. This process moves the outer circumferential surface of the grinding object. 10 by means of the lower grinding wheel part 38 finely ground, while the grinding object 10 by means of the side grinding wheel part 36 The product is roughly ground to ensure a smooth finish. 20 to obtain.
[0024] Now the offset amount of the cup grinding wheel described in step (a) is 30 described. The Fig. 4 and Fig. 5 are the repositioning of the cup grinding wheel 30 Explanatory drawings from the reference state. In the Fig. 4 and Fig. 5 is the lower part of the grinding wheel 38 (excluding the border) 37 ) hatched. Fig. 4 shows a state in which the cup grinding wheel 30 is offset so that the central axis 30athe cup grinding wheel 30 to cover a distance X1 is shifted to the left from the reference state (dashed two-dot line). In this state, when projecting the central axis, the following appear: 10a of the grinding object 10 on the lower part of the grinding wheel 38 the cup grinding wheel 30 two straight line segments of one length L1 (thick solid lines in Fig. 4) on the lower part of the grinding wheel 38 On the other hand, it shows Fig. 5 a state in which the cup grinding wheel 30 is offset so that the central axis 30a the cup grinding wheel 30 from the reference state (dashed two-dot line) by a distance X2 (> X1) is shifted to the left. In this state, when projecting the central axis, it appears 10a of the grinding object 10 on the lower part of the grinding wheel 38 the cup grinding wheel 30a single straight line segment of length L2 (thick solid line in Fig. 5) on the lower part of the grinding wheel 38 In Fig. 5 this straight segment is the inner circumference of the lower grinding wheel part 38 touching tangent.
[0025] The part of the lower grinding wheel section used for fine grinding 38 (The working width) is a straight segment of a length L1 in Fig. 4 and a straight line segment of length L2 in Fig. 5. If you compare Fig. 4 with Fig. 5, can, since the working width in Fig. 5 greater, the speed at which the grinding object 10 the movement in the axial direction will be increased. Furthermore, in Fig. 5, since the offset amount is greater, the boundary between the means of the lateral grinding wheel part 36 coarsely ground surface and the lower grinding wheel part38 The finely polished surface has a gently rounded shape, so that chips or the like are not present on the polished product. 20 less likely to occur.
[0026] Incidentally, the working width is the maximum length Lmax when the straight segment is projected onto the central axis. 10a of the grinding object 10 on the lower part of the grinding wheel 38 one of the inner circumferences of the lower grinding wheel part 38 touching tangent is (see Fig. 5) That is, if the offset amount is equal to X2, the working width is the maximum length Lmax. If the offset amount is less than X2, the following appear when projecting the center axis. 10a of the grinding object 10 on the lower part of the grinding wheel 38 two straight segments on the lower grinding wheel part 38 (see Fig.4) so that the length of the line segments is less than Lmax / 2. On the other hand, as the offset increases beyond X2, the length of the line segment gradually decreases from Lmax. Therefore, it is preferable to set the offset such that when projecting the central axis 10a of the grinding object 10 on the lower part of the grinding wheel 38 a single straight segment on the lower grinding wheel part 38 appears, and is set so that the length of the straight segment is greater than or equal to Lmax / 2 and less than or equal to Lmax.
[0027] In the manufacturing process described above, the outer circumferential surface of the grinding object is 10 by means of the lower grinding wheel part 38 finely ground, while the grinding object 10 by means of the side grinding wheel part 36 The product is roughly ground to ensure a smooth finish. 20with a smaller diameter than that of the grinding object 10 to obtain. That is, in this manufacturing process, the grinding object is 10 using both the side grinding wheel part 36 as well as the lower grinding wheel part 38 ground. Therefore, the processing time can be reduced compared to the conventional method. In the Fig. 4 configuration shown, in which the offset amount is equal to X1, as well as in the configuration shown in Fig. 5 configuration shown, in which the offset amount of the cup grinding wheel 30 If X2 is equal to the other two parts, grinding is carried out using both the side grinding wheel part. 36 as well as the lower grinding wheel part 38 , so that the processing time can be reduced
[0028] Furthermore, since the cup grinding wheel 30 one where the border 37between the side grinding wheel part 36 and the lower grinding wheel part 38 is rounded, is used, the boundary between the by means of the lateral grinding wheel part 36 coarsely ground surface and the lower grinding wheel part 38 finely ground surface of the grinding object 10 Not angular, but rounded. That's why chips occur on the polished product. 20 less likely.
[0029] Furthermore, since the cup grinding wheel 30 one in which the lower grinding wheel part 38 ring-shaped along the outer circumference of the lower side of the pot 32 The arrangement allows the cup grinding wheel to be easily attached to and removed from the grinding device.
[0030] Furthermore, if the offset amount of the cup grinding wheel 30so that when projecting the central axis 10a of the grinding object 10 on the lower part of the grinding wheel 38 a single straight segment on the lower grinding wheel part 38 When the length of the straight segment is set to be greater than or equal to Lmax / 2 and less than or equal to Lmax, the following advantageous effects are achieved. That is, since the working width is greater than in the case where, when projecting the central axis... 10a of the grinding object 10 on the lower part of the grinding wheel 38 two straight segments on the lower grinding wheel part 38 The speed at which the grinding object appears large can affect the speed at which it is ground. 10 The axial movement can be increased. As a result, the machining time can be further reduced. Furthermore, since the boundary between the lateral grinding wheel part is defined by the lateral grinding wheel section, 36coarsely ground surface and the lower grinding wheel part 38 The finely polished surface has a gently rounded shape, in the polished product 20 Less likely to occur with chipping or similar defects.
[0031] Furthermore, if the abrasive grains of the lower grinding wheel part 38 finer than those of the side grinding wheel part 36 are the rough grinding of the grinding object 10 by means of the side grinding wheel part 36 It can be carried out effectively and the fine grinding of the grinding object can be carried out gently using the lower grinding wheel part.
[0032] It should be noted that the present invention is not at all limited to the embodiment described above, and it goes without saying that the present invention can be implemented in various embodiments without deviating from the technical scope of the present invention.
[0033] For example, in the embodiment described above, a honeycomb structure with a large number of honeycombs in the axial direction can be used as the grinding object. 10 can be used. The honeycomb structure can be one in which honeycombs, some ends of which are closed and others open, and honeycombs, some ends open and others closed, are arranged alternately (for example, a DPF).
[0034] In the above embodiment, the lower grinding wheel part 38 the cup grinding wheel 30arranged in a ring shape, but the lower grinding wheel part 38 can also be applied to the entire bottom of the pot 32 be arranged.
[0035] In the embodiment described above, the central axis 30a the cup grinding wheel 30 with respect to the central axis 10a of the grinding object 10 It is offset to the left, but it can also be offset to the right. EXAMPLES
[0036] The following are experimental examples. 1 until 4 , which are examples of the present invention, are described. Fig. Figure 6 is an explanatory drawing illustrating the process of manufacturing a DPF. 120 from a honeycomb structure 110 shows, Fig. Figure 7 is a perspective view of a honeycomb element. 50 , Fig. 8 is a sectional view along a line BB in Fig. 7, and Fig.Figure 9 shows the dimensions of one of the experimental examples. 1 and 2 used cup grinding wheel 30 The following experimental examples do not limit the present invention. Experimental examples 1 and 2
[0037] The grinding object used was an octagonal, columnar honeycomb structure made of SiC ceramic. 110 made as in Fig. 6 shown. The honeycomb structure 110 is achieved by arranging cuboid honeycomb elements 50 in five rows and five columns and connecting them together to form a square prism 185 mm high, 185 mm wide and 150 mm deep, and subsequent sanding of the honeycomb elements 50 At four corners, it transitions from a cuboid shape to a triangular column shape, resulting in an overall octagonal column shape. As in the Fig. 7 and Fig. As shown in section 8, the cuboid honeycomb elements are 50Each component contains honeycombs. 52 , one end of which is open and the other end of which has closures 52a are sealed and honeycomb 54 , one end of which has closures 54a They are arranged alternately, with the ends being closed and the other ends being open.
[0038] The side surface of this grinding object 10 was done using the cup grinding wheel 30 with the in Fig. The dimensions shown in the images have been ground to create a ground product. 20 , which was a DPF with a diameter of 165 mm. Grinding was carried out with the workpiece being fed forward. 10 In both experimental examples 1 and 2 The offset amount was set so that the working width had the maximum length Lmax, as in Fig. Figure 5 is shown. Table 1 shows the grinding conditions of the test examples. 1 and 2 . Table 1 Experimental example Grinding object grinding wheel Feed rate (mm / min) Speed (RPM) Speed (RPM) Offset amount (mm) Working width (mm) 1 300 4,5 7000 54 79,3 2 400 6,0 7000 54 79,3
[0039] In both experimental examples 1 and 2 No chipping occurred during grinding, and neither the front closures were damaged. 52a and the rear closures 54a damaged. The processing time per piece of the grinding object. 10 The duration was 30 seconds in the experimental example. 1 and 22 0.5 seconds in experimental example 2 . As the same grinding object 10 using a wheel-shaped grinding wheel 210 with an abrasive grain layer on its side surface as in Fig. As shown in section 14, the processing time per piece was in the shortest case. 40 Seconds. Experimental examples 3 and 4
[0040] The same grinding object 10 as in the experimental examples 1 and 2 was done using the cup grinding wheel 30ground to create a polished product 20 , which was a DPF with a diameter of 165 mm. When the cup grinding wheel 30 Apart from the fact that the grinding wheel height was 35 mm, such a grinding wheel with the in Fig. The dimensions shown in section 9 were used. Grinding was performed with the workpiece being fed forward. 10 In experimental example 3 The offset amount was set to zero (reference state). In this case, since the working width was small, grinding was performed at a low feed rate of the workpiece. 10 carried out. In experimental example 4 The offset amount was set so that the working width had the maximum length Lmax, as in Fig. 5 shown. In experimental example 4 can the feed rate of the grinding object 10 at a high speed, as in the experimental examples 1 and 2to be set up, but to use an experimental example 3 For comparison, the grinding was performed under the same conditions as in the experimental example. 3 carried out. Table 2 shows the grinding conditions of the test examples. 3 and 4 . Table 2 Experimental example Grinding object grinding wheel Feed rate (mm / min) Speed (RPM) Speed (RPM) Offset amount (mm) Working width (mm) 3 120 6,5 7000 0 14 4 120 6,5 7000 54 79,3
[0041] In both experimental examples 3 and 4 No chipping occurred during grinding, and neither the front closures were damaged. 52a and the rear closures 54a damaged. Fig. Figure 10 is a perspective view showing a state during the grinding process in the experimental example. 3 shows, and Fig. Figure 11 is a perspective view showing a rounded shape of the boundary between the roughly ground surface and the finely ground surface during grinding in the experimental example. 3 shows. Fig.Figure 12 is a perspective view showing a state during grinding in the experimental example. 4 shows, and Fig. Figure 13 is a perspective view showing a rounded shape of the boundary between the coarsely ground surface and the finely ground surface during grinding in the experimental example. 4 shows. Comparing with reference to these figures, experimental example 3 with experimental example 4 It is evident that the rounded surface at the boundary between the coarsely ground surface and the finely ground surface during grinding in the experimental example 4 A more gently rounded surface (rounded surface with a larger radius of curvature) is than in the experimental example. 3 Therefore, it can be said that when performing grinding with an offset cup grinding wheel 30The occurrence of chipping can be prevented more reliably, and the breakage of the closures can be prevented more reliably than when grinding without repositioning the cup grinding wheel. 30 .
[0042] The present application claims priority over Japanese patent application No. 2016-157439, filed on August 10, 2016, the entire contents of which are incorporated herein by reference. Industrial applications
[0043] The present invention is applicable, for example, to the production of a honeycomb structure. Specific examples of honeycomb structures include a honeycomb structure in which a plurality of honeycombs are not closed (for example, a catalyst carrier), and a honeycomb structure in which honeycombs whose one end is closed and whose other end is open, and honeycombs whose one end is open and whose other end is closed, are arranged alternately (for example, a diesel particulate filter (DPF)). Reference symbol list 10 Grinding object 10a Central axis 20 polished product 30 cup grinding wheel 30a Central axis 32 pots 34 Through hole 36 lateral grinding wheel part 37 border 38 lower grinding wheel part 50 honeycomb elements 52a, 54a Closure 52, 54 honeycomb 110 honeycomb structure 120 DPF 210 grinding wheel 220, 230 honeycomb structure QUOTES INCLUDED IN THE DESCRIPTION
[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature
[0000] JP 2016157439
[0042]
Claims
[1] Method for producing a ground product with a smaller diameter than that of a grinding object by grinding the side surface of the grinding object having a polygonal columnar or cylindrical shape, wherein the method for producing a ground product comprises the following steps: (a) Arranging a cup grinding wheel comprising a lateral grinding wheel portion arranged on the side face of a cup and a lower grinding wheel portion arranged on the lower side of the cup, such that the central axis of the cup grinding wheel is orthogonal to the central axis of the grinding object, or such that the central axis of the cup grinding wheel is offset parallel to itself from a state in which the central axis of the cup grinding wheel is orthogonal to the central axis of the grinding object; and (b) axially rotating the cup grinding wheel so that the cup grinding wheel grinds the side surface of the grinding object while the grinding object is axially rotated and moved in the axial direction, thereby fine grinding the outer circumferential surface of the grinding object by means of the lower grinding wheel part while simultaneously coarse grinding the grinding object by means of the side grinding wheel part to obtain the ground product. [2] Method for producing a ground product according to claim 1, wherein in step (a) the cup grinding wheel is one in which the abrasive grains of the lower grinding wheel part are finer than those of the side grinding wheel part. [3] Method for producing a ground product according to claim 1 or 2, wherein in step (a) the cup grinding wheel is one in which the boundary between the side grinding wheel part and the lower grinding wheel part is rounded. [4] Method for producing a ground product according to any one of claims 1 to 3, wherein in step (a) the cup grinding wheel is one in which the lower grinding wheel part is arranged in a ring shape along the outer circumference of the lower side of the cup. [5] Method for producing a ground product according to claim 4, wherein in step (a) the central axis of the cup grinding wheel is offset parallel to the central axis of the grinding object starting from a state in which the central axis of the cup grinding wheel is orthogonal to the central axis of the grinding object, and the central axis of the cup grinding wheel is offset such that when the central axis of the grinding object is projected onto the lower grinding wheel part of the cup grinding wheel, a single straight segment appears on the lower grinding wheel part, and such that the length of the straight segment is greater than or equal to Lmax / 2 and less than or equal to Lmax (Lmax is the length of the straight segment when the offset is carried out such that the straight segment is a tangent touching the inner circumference of the lower grinding wheel part). [6] Method for producing a polished product according to any one of claims 1 to 5, wherein the grinding object is a ceramic honeycomb structure. [7] Method according to claim 6, wherein in the honeycomb structure honeycombs whose one end is closed and whose other end is open are arranged alternately and honeycombs whose one end is open and whose other end is closed. [8] Cup grinding wheel, containing: a lateral grinding wheel portion arranged on the side surface of a pot; and a lower grinding wheel part located on the underside of the pot, which has a finer abrasive grain size than the side grinding wheel part. [9] Cup grinding wheel according to claim 8, wherein the boundary between the lateral grinding wheel part and the lower grinding wheel part is rounded. [10] Cup grinding wheel according to claim 8 or 9, wherein the lower grinding wheel part is arranged in a ring shape along the outer circumference of the lower side of the cup.