JPH02145258A - Trueing method for grinding grindstone and trueing tool used for method thereof - Google Patents

Abstract

PURPOSE:To transfer the grinding sectional shape of the body to be ground onto a grindstone correctly, simply and inexpensively by maintaining the positional relation and movement relation of a work to a grinding grindstone in a grinding forming stage by a trueing tool as it is. CONSTITUTION:A trueing tool 5 having a diamond abrasive grain face 7 in the shape equal to the face to be ground and formed of a work 13 in the state of maintaining the positional relation of a grinding grindstone 14 and work 13 and the relative movement relation between the both of the case of a grinding and forming stage in the manufacturing process of the tool having a rotation twist groove, is replaced with the work 13. Then, the grinding grindstone 14 is subjected to form forming by the abrasive face 7 of this trueing tool 5.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for truing a grinding wheel and a truing tool used in the method, and in particular, the grinding wheel completely formed by the truing method is suitable for use on the inner circumferential surface of a chip discharge groove in a product tool such as a drill or an end mill. It is used to process and form a surface that is to be ground and formed with a twist angle in the axial direction, such as the second outer circumferential surface, by so-called interference grinding. That is, the present invention relates to a truing method for fully forming a grinding wheel for manufacturing a product tool having a surface formed by interference grinding, and a truing tool used in the method.

[Prior art]

There are a wide variety of truing tools as described above for each product tool, and the prior art will be described using, as an example, a truing tool for completely forming a grinding wheel for forming a groove in a drill. When the chip discharge groove of the drill is formed by grinding with a general grindstone, the torsion angle θ of the drill 13 is adjusted as shown in FIG.
Generally, the setting angle θ1 of the grinding wheel 14 is set to θ≦O1, and in the normal case, θ1−θ+(00 to 5°)
is set to This is because interference grinding is performed with a certain angle in order to alleviate deformation of the grindstone 14 due to wear, to maintain the sharpness of the grindstone, and to improve the application of grinding oil. Therefore, drill 13
In order to obtain a predetermined cross-sectional shape when cutting in the direction perpendicular to the axis of the grindstone 14 (Y' axis in the figure), considering interference cutting when the grindstone setting angle is 01, axial direction)
The cross-sectional shape of the cut must be set, which requires complex calculations. Next, a conventional method for actually forming the grindstone in its entirety after the above-mentioned Y'-axis cross-sectional shape is set will be described below with reference to FIGS. 6 to 11. Figure 6 shows two weighted diamonds 11. It is a figure which shows the method performed using '12. One tire 11 rotates with a radius R6 around point a, and the other weight diamond 12 rotates with a radius Rb around point b, thereby forming the Y° axial cross-sectional shape of the drill 13 (as shown in FIG. In this method, the cutting edge side curvature and heel side curvature of the shape (viewed in the direction of the arrow (■)) are approximated to Ra and Rb, respectively. This includes the positional relationship between the grindstone 14 and points a and b in the Y-axis and Z-axis directions, the radii R and R6, and the center C of the cross-sectional shape of the drill 13 in the Y° axis direction and the position of the grindstone in the Y-axis direction. Each Z-axis position must be accurately determined. FIG. 7 is a diagram showing a method of using the rotary dresser 15, and FIG. 8 is a right side view thereof. The rotary dresser 15 may be driven by the rotation of the grindstone 14 or may have a separate drive source, and if it has a separate drive source, it may be rotated in the same direction or in the opposite direction to the rotation of the grindstone. A large number of diamond grains for correction are embedded in the general shape portion of the rotary dresser 15, and the grindstone is formed using the diamond grains. The overall shape of the rotary dresser 15 is a grindstone shape in the Y'-axis section that takes interference grinding into consideration, and is formed in advance by the drill 13 and the grindstone 14, and the grindstone 14 and the roller as in the case of FIG. The Y'-axis and Z-axis positions of the crib dresser 15 need to be determined accurately. FIG. 9 is a diagram showing a method of using a block dresser 16 instead of the rotary dresser 15 of FIGS. 7 and 8. A large number of diamond grains for correction are embedded in the general shape portion of the block dresser 16, and the grindstone 14 is shaped using them. The total shape part is Y in consideration of interference grinding. The shape of the grindstone in the axial cross section is pre-formed, and the drill 13 is the same as in the case of FIG.
4. The Y'-axis and Z-axis positions of the grindstone L4 and the block dresser 16 must be determined accurately. However, the table 17 can reciprocate in a direction perpendicular to the Y-axis. FIG. 1O and FIG. 11 are diagrams showing a method of forming a grindstone by moving the correction diamond grindstone 18 in the Y'-axis direction and the Z-axis direction by numerical control, respectively. FIG. 10 shows a case where the center O of the grinding wheel 14 and the axial center 0° of the diamond grinding wheel 18 for correction are parallel, and FIG.
This shows the case where is a right angle. Even in these methods,
As in the case of each side above, the drill 13, the grindstone 14, and the grindstone 1
4 and the correcting diamond grindstone 18 in the Y° and Z-axis directions, respectively, must be determined accurately, and furthermore, if numerical control is used, the apparatus would be extremely complicated and expensive.

[Problems to be Solved by the Invention] As explained above, in the grindstone forming performed by various conventional truing tools, the shape of the grindstone formed (Y To perform an analysis that takes into account interference grinding when determining the 'shaft cross-sectional shape)? It requires a lot of calculations. In addition, in order to obtain an accurate grinding cross section of the object to be ground, it is necessary to accurately shape the grinding wheel itself. They also become larger, more complex, and more expensive. Furthermore, unless the positional relationships between the object to be ground and the grinding wheel, the grinding wheel and the correction diamond, and their trajectories are all accurate, a predetermined accurate ground cross-sectional shape cannot be obtained. The present invention has been devised to effectively solve the problems of the prior art as described above. Therefore, an object of the present invention is to accurately and easily grind the cross-sectional shape of a workpiece, and at low cost. An object of the present invention is to provide a truing tool that can be transferred onto a grindstone. [Means for solving the problem and operations/effects] The truing method and truing tool of the present invention will be explained. There are various manufacturing processes for a tool having a rotating twist groove. Among these processes, for example, the positional relationship between the grinding wheel and the workpiece during the grinding and forming process using interference grinding, such as the grinding and forming process when grinding and forming the chip discharge groove of a drill, and the relationship between the two. The relative motion relationship is utilized as is. In other words, the workpiece is replaced with the truing tool according to the present invention while maintaining the mutual positional relationship and motion relationship between the tool and the workpiece.The truing tool according to the present invention , has a diamond grain abrasive surface of the same shape as the surface to be ground and formed of the workpiece, and this truing tool maintains the positional relationship and motion relationship of the workpiece with respect to the grinding wheel during the grinding and forming process. The diamond grain abrasive surface completely shapes the grinding wheel as a workpiece.In other words, the relationship between the tool and workpiece in which the grinding wheel is used as a tool in the grinding and forming process is the same as the truing tool in which the grinding wheel is used as a workpiece in the truing process. and the workpiece, and as a result, the same grinding surface shape as the ground surface of the workpiece is completely formed on the grinding wheel under the same conditions as the grinding and forming process by the interference grinding.According to the present invention For truing tools, it is also possible to use a product tool whose shape has already been completed as a material for the truing tool.Also, it is possible to use a product tool whose shape has already been completed as a material for the truing tool.Also, the truing tool can be made from a completely unprocessed material, such as a cylindrical material for a drill. In the case of manufacturing, a grinding wheel with a radial cross-sectional shape of the peripheral edge obtained by truing is used in the grinding process when actually manufacturing a product tool.
All you have to do is cut as deep as the thickness of the diamond grain layer, perform the grinding process, and then firmly form the diamond grain layer on the ground surface using a method such as electrodeposition. The cross-sectional shape can be obtained without doing this. For example, to explain specifically about a tool for truing a grinding wheel for forming a groove on a drill, the groove depth is deeper than that of a regular drill by the thickness dimension that forms a layer of diamond grains on the inner circumferential surface of the groove. A drill with a long groove length is manufactured in the same manner as a finished drill, and diamond grains are fixed to the inner peripheral surface of the groove by electrodeposition or brazing, and the completed drill is used as a truing tool. therefore,
Accurate shaping of the grinding wheel can be performed using the same equipment that normally grinds drills with the grinding wheel. That is, in the conventional technology, the relative positional relationship between the grinding wheel and the object to be ground during processing of the object to be ground (the workpiece material that is formed into a product such as a drill by the grinding wheel), and the truing tool and the grinding wheel during truing. However, according to the truing tool of the present invention, both of the above-mentioned relative positional relationships can be made equal. Specifically, if the rotational angle position of the drill-shaped truing tool is limited to a range that allows the grinding wheel to penetrate approximately to the deepest part of the groove, grinding can be performed using a normal drill grinding machine using its operating instructions. The overall shape of the grindstone can be made, and even if the above-mentioned grindstone setting angle θ1 changes somewhat, there is no need to redo complicated calculations that take interference grinding into consideration. In this way, since truing is performed in exactly the same positional relationship and same motion as normal drill grinding, special attention must be paid to the positional relationship between the drill and the grinding wheel, which are the objects to be ground, and the grinding wheel and the diamond grinding wheel for correction. This will make your work easier. Furthermore, since a forming device as an intermediate medium is not required, the forming accuracy of the drill is increased accordingly. Examples of tools having a rotating torsional groove as described above include various types of drills and end mills, torsion groove tools for shafts such as taps and helical groove reamers, and tools such as hob screw polishing tools as gear cutting tools. It will be done. Further, as a general industrial application, the technology of the present invention can be used as is for cam grinding using a grinding center. [Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a truing method and tool for a grindstone for grinding grooves of a drill will be described. What is shown in Figure 1 is the material immediately before the inner circumferential surface of the drill is machined, in which the inner circumferential surface of the chip discharge groove is formed, that is, the tip surface is formed on a round steel bar, and the shank is chamfered. This is a state in which the groove grinding process has been completed for the material at the completed stage, and it has the same groove shape as a normal drill as a product tool, and is an intermediate processed product l before being finished into a truing tool. It has become. Therefore, it is of course possible to use a drill that has already been finished into a product tool as the intermediate workpiece l. FIG. 2 shows a cross-sectional shape taken along the line ■--■ in FIG. From the tip 2 of the intermediate product 1 to the groove 3. The length to the cut-up part 4 of the whetstone is 12. This length is assumed to be the temporary groove length. Therefore, this provisional flute length Q1 is equal to the flute length of the product drill, and the thickness dimension T of the central portion shown in FIG. is equal to the core thickness dimension of the product drill. Here, the essential shape requirements for the intermediate product 1 are only the surface where the truing tool forms the abrasive surface that participates in truing, and the product also covers other surfaces that are not involved in truing, such as the second outer surface. It is not necessary to have the same shape as the drill, but if you want to perform truing on both the groove grinding wheel and the outer circumference second surface grinding wheel with one truing tool, it is possible to require both surfaces. It is. What is shown in FIG. 3 is the truing tool 5 of this embodiment that has been finished from the intermediate workpiece l shown in FIG. 1 to the final product, and FIG. A cross-sectional shape in the direction of the arrow is shown. On the inner circumferential surface of the groove 3°, diamond grains for correction are electrodeposited to form an abrasive surface 7. Before this electrodeposition process, the inner circumferential surface of the groove is further cut down from the intermediate workpiece 1 in FIG. be made into The dimension g in the figure is the groove length of the portion where the inner circumferential surface is finished with the diamond grain abrasive surface 7, and is e in Figure 1.
It has exactly the same dimensions as l. Moreover, the dimension indicated by Q is the groove length dimension expanded by the above-mentioned undercutting. Since a layer 6 of diamond grains for correction is formed on the inner peripheral surface of the cut groove, the finished dimension ''' in FIG. 4 becomes equal to 'I'' in FIG. 2, that is, the center of the product drill. It is equal to the thickness dimension. In the above embodiment, two grooves were formed and abrasive surfaces were formed on the inner peripheral surfaces of both grooves. However, since both grooves are formed in the same axially symmetrical shape, only one of the grooves is formed. It is also possible to form an abrasive surface on either side, or to form only one groove on either side. FIG. 12 shows the relationship between the truing tool 5 and the grinding wheel 14 in the truing method according to the present invention. As mentioned above, the truing tool 5 is the drill 13
is the same in shape as Drill 1 shown in Figure 5.
It is possible to replace the relationship between the truing tool 5 and the grinding wheel 14 with the relationship between the truing tool 5 and the grinding wheel 14, reverse the relationship between the grinding body and the ground object, and move each of them. As is clear from the comparison between FIG. 12 and FIG. 5, the groove grinding process of the drill 13 using the grinding wheel 14 is completely similar.
Truing is performed depending on the positional relationship and relative motion relationship between the truing tool 5 and the grinding wheel 14. That is,
The truing tool 5 is located at the drill 13
The grinding wheel 14 moves in the same position as in the groove grinding process, and the grinding wheel 14
The shape of is corrected to the shape of the abrasive surface 7 of the truing tool 5.

[Brief Description of the Drawings] Fig. 1 is a side view showing an intermediate product according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a main A side view showing an embodiment of the invention, FIG. 4 is a cross-sectional view taken along the line IV-■ in FIG. 3, and FIG. FIG. 6 is a diagram showing a first example of the total shape of a grinding wheel in the prior art, and FIGS. 7 and 8 are diagrams showing a second example of the total shape of a grinding wheel in the prior art, respectively.
FIG. 9 is a diagram showing a third example of the total shape of a grinding wheel in the prior art, FIG. 1O and FIG. 11 are diagrams showing a fourth example of the total shape of a grinding wheel in the prior art, and FIG. 12 FIG. 3 is a diagram showing the relationship between a truing tool and a grinding wheel in the truing method according to the present invention. l... Intermediate product, 3... Groove, 5... Truing tool, 6... Layer of diamond grains for repair, 7...
Diamond grain abrasive surface, 13... Drill as a workpiece, 14... Grinding wheel patent Applicant: Kobe Steel Co., Ltd. Agent Patent attorney: (1 other person) Figure 7 Figure 9 Figure 5 Figure 6 Figure 12 ×P''

Claims (2)

[Claims] (1) While maintaining the positional relationship between the grinding wheel (14) and the workpiece (13) and the relative motion relationship between them during the grinding and forming process in the manufacturing process of a tool having a rotating torsion groove. , a truing tool (5) having a diamond grain abrasive surface (7) of the same shape as the formed surface to be ground of the work (13) is replaced with the work (13), and the abrasive surface (7) of the truing tool (5) ) by the grinding wheel (1
4) A truing method for a grinding wheel characterized by forming the entire shape. (2) A tool having a rotating torsion groove is provided with a diamond grain abrasive surface (7) having the same shape as the surface to be ground formed by the grinding wheel (14), during the forming process of the surface to be ground; , by replacing the workpiece (13) rotatably supported at both ends of the rotating shaft to maintain a relative movement relationship with the grinding wheel (14),
The diamond grain grinding surface (7) is the grinding wheel (14)
A truing tool characterized by forming a total shape.