JP2009028855A - Screw groove machining method for machining screw groove of member by rotatively moving cutting tool by nc machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting work method for a female screw member by a machining center, capable of machining the round screw groove of the female screw member having the comparatively large round screw groove for a short period of time and with high accuracy by using the machining center. <P>SOLUTION: The female screw member 100 mounted on a table 5 of the machining center is formed with the round screw groove 1 cut and machined by a blade portion 2 by axially rotating the cutting tool 3 inserted and attached to the main spindle head 4 of the machining center and moving the cutting tool in X, Y and Z axial directions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a thread groove machining method for machining a thread groove of a member on a stationary side by holding a cutting tool in an NC machine such as a machining center, for example.

  There are various types of female screw members, but there is a female screw member 100 having a relatively large screw lead as shown in FIG. As a general processing method of the female screw member 100, as shown in the flowchart of FIG. 4, first, the entire shape processing from the material (step 100), then the thread groove cutting (step 101), and the thread groove processed The heat treatment step (step 102) for quenching the workpiece, the thread grinding process (step 103) as the final process, and the like. Of the above processing steps, step 103 is usually performed by a screw grinder, but the thread groove cutting in step 101 is usually performed by rotating the female screw member 100 as shown in FIG. It is common to do.

That is, for example, the internal thread member 100 is gripped by the chuck 9 of the main shaft 8 of the lathe, and this is rotated and the tool post 12 that is disposed coaxially with the internal thread member 100 and grips the processing tool 10 is moved in the axial direction. The R thread groove 1 is processed. In this case, the blade portion 11 of the processing tool 10 has a shape commensurate with the R shape of the R thread groove 1, and it has been generally employed to perform the screw processing by moving the tool post 12 in the axial direction. There are various known techniques related to the thread groove processing of the female thread, and examples thereof include “Patent Document 1” and “Patent Document 2”.
JP-A-5-228732 (FIG. 1) Japanese Patent Laying-Open No. 2001-9637 (FIG. 1)

“Patent Document 1”, “Japanese Laid-Open Patent Application No. 5-228732”, “Thread Groove Processing Method and Device” relates to grinding instead of cutting, and the processing method is shown in FIG. This is almost the same processing method as that described above, and consists of a member rotating. Further, as shown in (b) of (FIG. 1), the “female thread machining method” of “Japanese Patent Laid-Open No. 2001-9637” of “Patent Document 2” is rotated by the same method as in FIG. The cutting process to be performed is illustrated.
As described above, the conventional thread groove processing is to perform screw processing by rotating all members.

  Although the above-described thread groove machining can be performed with high precision as such, the machining allowance is limited, and the machining tool 10 (FIG. 5) needs to be reciprocated many times. In particular, in the case of the female screw member 100 having a relatively large screw lead as shown in FIG. Moreover, there was wear of the blade part 11, and frequent replacement was required. Of course, in the above processing method, the other parts of the female screw member 100 cannot be processed without changing the setup, and there are many places that cannot be processed by the machine depending on the shape. There was a problem that had to be processed with. Therefore, it is difficult to maintain the consistency between the threaded portion and other processed portions, and as a result, there is a problem that it is difficult to form the highly accurate female screw member 100.

  The present invention has been invented to solve the above-described problems. The R thread groove is processed in a short time and with high accuracy, and the consistency between the other processed portions and the thread groove ( It is an object of the present invention to provide a thread groove machining method for machining a thread groove of a member by rotating and moving a cutting tool by an NC machine capable of concentricity.

  In order to achieve the above object, the present invention provides a rough machining method for a member having a large R thread groove of a screw lead, which method coincides with the axial direction of the member. The R of the member that automatically controls the Z axis and the X axis and the Y axis orthogonal to the Z axis at the same time and rotates and moves the cutting tool held along the Z axis so as to be stationary. It is characterized by cutting a thread groove.

  The invention of claim 2 is characterized in that the cutting tool has a substantially R-shaped portion formed by connecting a plurality of R-radius arcuate surfaces on the tip side.

  Further, the invention of claim 3 is characterized in that the cutting tool has an inclined surface shape portion connected to the proximal end side of the substantially R-shaped portion for chamfering the corner portion of the R thread groove. And

  The invention according to claim 4 is characterized in that the inclined surface-shaped portion is inclined in the expanding direction from the base end side of the substantially R-shaped portion.

  According to the screw machining method of the first aspect of the present invention, the machining tool is held on the NC machine (for example, machining center) side, and the machining tool is rotationally moved (X, Y, Z direction) to move the member on the stationary side. Since it consists of the method of processing, processing efficiency is good compared with the conventional processing method, and it can process other shape parts of a member, without removing a member, and can maintain consistency.

  Further, according to the threading method of claim 2, the cutting tool has a special R shape with a cutting edge corresponding to the R thread groove, and the R thread groove can be smoothly machined by the rotational movement of the cutting tool ( This theory is know-how and is omitted here).

  Moreover, according to the threading method of Claim 3 and 4, the chamfering process of the edge of R thread groove is smoothly performed by forming an inclined surface shape part.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a thread groove machining method for machining a thread groove of a member by rotating and moving a cutting tool by an NC machine of the present invention will be described in detail with reference to the drawings. In this embodiment, a case where a machining center is employed as the NC machine will be described. However, the present invention is not limited to this.
FIG. 1 schematically shows the main part of a machining center. In this embodiment, the machining center is of a vertical type, the vertical axis is the Z axis, and the horizontal plane of the table 5 is the X and Y axes. The female screw member 100 is fixed upright on the table 5. The machining center is not limited to a vertical type. A spindle head 4 is disposed above the table 5. Of course, the spindle head 4 is rotationally driven around the Z axis and automatically controlled along the Z, X, and Y axes.

  A holder 6 that holds the cutting tool 3 is attached to the spindle head 4. Of course, the holder 6 is detachable from the spindle head 4. A specially shaped blade 2 is detachably fixed to the tip of the cutting tool 3.

  The machining of the R thread groove 1 of the female screw member 100 is performed by inserting the blade part 2 of the cutting tool 3 into the screw machining hole 7 of the female screw member 100 as shown in FIG. , Y and Z directions. The machining center is rigid as a boring machine, and the machining of the R thread groove 1 by the cutting tool 3 is performed in a short time and with high accuracy.

FIG. 2 shows the detailed structure of the blade part 2 of the cutting tool 3. This detailed content is know-how and will not be disclosed here.
As shown in the figure, the outline structure of the blade portion 2 is composed of a substantially R-shaped portion 2a at the tip and an inclined surface-shaped portion 2b that is in contact with this and expands in a taper shape toward the upper expanding direction. The substantially R-shaped portion 2a has a smaller diameter than the R dimension of the R thread groove 1 and is composed of a substantially semicircular shape and a plurality of Rs connected to each other. However, the detailed description is a know-how and is omitted. . Further, the inclined surface shape portion 2b chamfers the R thread groove 1. In FIG. 1, the blade portion 2 is composed of one projecting on one side, but one projecting on both sides or one having a circular arc shape as a whole is applied (detailed explanation is omitted). Further, as a member not requiring chamfering, as shown by a dotted line in FIG. 2, a straight member without the inclined surface shape portion 2b can be adopted.

  As described above, the desired R thread groove 1 can be formed in the female screw member 100 with high accuracy by rotating the cutting tool 3 in the state shown in FIG. 1 and moving the cutting tool 3 in the X, Y, and Z axis directions. . In addition, the processing time can be shortened compared to the conventional method (proven).

  The present invention is as described above. However, the present invention is not limited to the contents, and those of the same technical category are of course applied.

  The thread groove machining method for machining the R thread groove of the member by rotating and moving the cutting tool with the NC machine of the present invention is not only applied to the female thread member according to the above description, but is applied to thread groove machining of various shapes. The range of use is wide.

The schematic diagram which shows an example of the cutting method by the machining center of the internal thread member of this invention. The partial expanded sectional view which shows the shape of the blade part of the cutting tool used for the cutting method by the machining center of the internal thread member of this invention. The shaft sectional view showing an example of the female thread member to which the cutting method by the machining center of the female thread member of the present invention is applied. The flowchart which shows the flow of general screw processing. The schematic diagram which shows an example of the thread groove processing by the conventional lathe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 R thread groove 2 Blade part 2a R shape part 2b Inclined surface shape part 3 Cutting tool 4 Spindle head 5 Table 6 Holder 7 Processing hole 100 Female thread member

Claims (4)

  A method of roughing a member having a large R thread groove of a screw lead, wherein the method automatically and simultaneously controls a Z axis coincident with the axial direction of the member and an X axis and a Y axis perpendicular to the Z axis. The cutting tool is rotated and moved by an NC machine, wherein the cutting tool held by the Z axis is rotated to cut the R thread groove of the member held in a stationary state. A thread groove processing method for processing a thread groove of a member.   2. The cutting tool is rotated by an NC machine according to claim 1, wherein the cutting tool has a substantially R-shaped portion formed by connecting a plurality of R-radius arcuate surfaces on the tip side. Then, a thread groove processing method for processing a thread groove of a member.   3. The NC according to claim 2, wherein the cutting tool has an inclined surface shape portion connected to a base end side of the substantially R shape portion for chamfering a corner portion of the R thread groove. A thread groove processing method for processing a thread groove of a member by rotating a cutting tool by a machine.   The said inclined surface shape part consists of what inclines in an enlarging direction from the base end side of the said substantially R-shaped part, The cutting tool is rotated and moved by NC machine of Claim 3, The screw of a member A thread groove machining method for machining grooves.

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