JPH0698533B2 - Asymmetric groove machining tool - Google Patents

Description

TECHNICAL FIELD The invention of the present application relates to a machining tool for an asymmetric groove.

[Conventional technology]

Conventionally, as this type of device, the devices shown in FIGS. 4 to 9 have been known.

FIG. 4 is a perspective view showing an example of a conventional tool layout for broaching, FIG. 5 is a side view showing the broach holder of FIG. 4, (a) is a side view showing the tool layout of the broach, and (b). Is a cross-sectional view taken along the line BB, and (c) is an enlarged view seen from the direction of arrow A2 in (a).

In the figure, 1 is a broach holder which is a tool holder used for machining a vane groove of a rotary compressor, 2 is a broach which is a machining tool attached to the broach holder 1, and 3 and 4 are predetermined to the broach holder 1. The cylinder and the pair of guides 5 and 6 which are provided at intervals of 5 are suction holes and discharge holes respectively provided in the cylinder 3, 7 is a clearance between the broach 2 and the broach holder, and 3a is a cylinder which is the workpiece. Reference numeral 11 denotes a vane groove which is fixed to the broach holder 1 with a screw 9 while the broach 2 is inserted in the groove 3a. Reference numeral 2a is a cutting edge of the broach 2, and the broach holder 1 to which the broach 2 is attached is provided with a broaching machine (not shown), which is a vane groove which is a work part.
When pulling out from the 3a portion in the direction A1, the vane groove 3a portion is cut by passing the cutting edge 2a through the work portion.

FIG. 6 is a view showing an example of another conventional broach, in which (a) is the same side view, (b) is the same front view, and (c) is a plan view.

In the figure, θ is a shear angle, which is provided in order to suppress the fluctuation of the cutting resistance acting on the broach 2 when cutting the groove plane with high accuracy.

Regarding the vane groove of the rotary compressor, it is necessary to make the vane groove of the cylinder asymmetrical in order to reduce the starting torque of the rotary compressor and prevent the trouble of discharge valve damage.

For this reason, as shown in FIG. 7, the vane groove 3a has an asymmetric shape with the discharge hole side 3b being long and the suction hole side 3c being short. In order to process the vane groove 3a having the asymmetric groove in this way, as shown in FIGS. 8 and 9, the broach 2 is placed on the broach holder 1 from the suction hole side 3c of the shorter groove to the screw 9 After fixing by, the vane groove 3a is processed.

The broach 2 which is a conventional tool for processing a vane groove is configured as described above, and when cutting the vane groove 3a, the broach holder 1 having the broach 2 attached thereto is guided by a pair of guides 4 above and below the vane groove 3a. Precisely slides up and down. When the broach holder 1 is pulled out in the direction A1 by a broaching machine, as is clear from the tool layout of the brooch 2 shown in FIG. By passing the vane groove 3a, it was possible to finish the vane groove 3a to a micron order in terms of flatness, parallelism, surface roughness, and squareness.

[Problems to be Solved by the Invention]

However, conventionally, in the broaching of the groove plane which requires good accuracy, the angle θ is attached to the blade in order to suppress the variation of the cutting resistance that the broach 2 receives.
As shown in the figure, in the case of an asymmetrical groove consisting of the longer groove side 3b and the shorter groove side 3c, when the broach 2 is removed, the blade part of the brooch 2 is shaded only on one side of the groove. Since the overcutting region X shown occurs and the region X is overcut, there is a problem that the flatness is deteriorated. As described above, since the blade angle θ is provided, the sliding distance and the surface portion can be reduced due to the pressure contact between the blade tip and the groove side when the broach 2 is pulled out, as compared with the case where the blade is not provided with the angle θ. It is conceivable that the lengths of the inclined portions are long, the surface portion is wide, and the posture is oblique to the surface portion rather than the vertical direction.

The present invention has been made to solve such a problem, and is a machining tool for finishing a groove of an asymmetrical shape formed in a workpiece with better accuracy. It is an object of the present invention to obtain a tool for processing an asymmetrical groove, which can suppress the fluctuation of the cutting resistance even in the flat surface processing of the groove, and at the same time, can perform accurate processing without overcutting as described above.

[Means for Solving the Problems]

For this reason, the asymmetric groove machining tool according to the present invention is one machining tool in which a blade portion having a shear angle is formed along each of the left and right side surfaces of the ridge portion of the rod-shaped tool base having a convex cross section. And a blade portion having no shear angle is combined, and a blade portion having a shear angle is arranged in front of the blade portion having no shear angle.

[Action]

In the above configuration, rough cutting is performed with a blade having a shear angle with a small variation in cutting resistance, and the remaining finishing allowance is cut with an asymmetric groove with a blade having no shear angle. Prevent cutting.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view comparing an embodiment of a processing tool for an asymmetric groove according to the present invention with a conventional device, and FIG.
2 is a side view showing an embodiment of an asymmetric groove machining tool according to the invention of FIG. 1, (a) is a side view showing an example of a conventional device, (b) is the same front view, (c) is the same plan view, FIG. FIG. 4 is a diagram for explaining a working state of the embodiment when the broach is removed, in comparison with a working state of the conventional apparatus. FIGS.
(E) shows the processing state according to the above-mentioned embodiment, respectively.
3 is a perspective view showing the same tool layout, FIG. 4 is a perspective view showing an example of a conventional tool layout for broaching, and FIG. 5 is a view showing the broach holder of FIG.
(A) is a side view showing the tool layout of the brooch,
(D) is a sectional view taken along line BB of (a), (c) is A2 of (a).
It is an enlarged view seen from the arrow direction.

The same (corresponding) constituent elements as those in the above-mentioned conventional apparatus shown in FIGS. 4 to 9 are represented by the same reference numerals to avoid redundant description.

In this embodiment, the machining tool 2 is a tool for machining the longer groove side 3b and the shorter groove side 3c, which are parallel planes of the asymmetric groove 3a, and is a rod-shaped tool having a convex cross section. Substrate
12 and the blade portions D having a shear angle are arrayed in front of the flat blade portion C, which is a blade portion having no shear angle, along the left and right side surfaces of the protrusion 12a having a convex cross section of the tool base 12. The case where they are integrally formed with the tool base 12 will be described as an example.

The broach, which is a processing tool according to this embodiment, has a third
In the tool layout shown in the figure, instead of the conventional broach, it is attached to the broach holder 1.
It is only necessary to replace it with a conventional broach, and the broach holder 1 which is a tool holder is pulled out in the direction of arrow A1 by a broaching machine with a large force to obtain the required vane groove width and accuracy.

The characteristic actions and effects of this embodiment will be described below.

As shown in FIG. 2, when cutting the asymmetrical groove, when the blade is completely removed, even if the cutting is completed in the right side processing portion 3c of the cylinder 3 having a shorter groove length, As shown in FIG. 2 (c), the long left side processed portion 3b remains to be processed in the shaded area. For this reason, the broach 2 comes in contact with one side, and the diagonally shaded portion is overcut, and the flatness is deteriorated by about Δ (5 to 10 μm) as shown by the shaded portion in FIG. 2D. As a countermeasure against this, the broach 2 is provided with a blade region C having no shear angle as shown in FIG. 1 to eliminate the overcutting region X when the broach 2 is completely removed as shown in FIG. 2 (e). It is like this.

Further, in the broach of this embodiment, as shown by an arrow in FIG. 1, a region D, which is a blade portion provided with a blade 11 having a shear angle in one broach 2, has a flat shape without a shear angle. The feature is that the region C which is the cutting tool portion provided with the blade 10 is also provided at the same time, and the region D is arranged in front of the region C. Rough cutting is performed in the region D which is the cutting tool portion having a small cutting resistance. The cutting allowance is reduced by the region C which is the blade portion, and stable cutting with a small cutting resistance can be performed. However, if all the broaches 2 shown in FIG. 6 are blades having no shear angle, the cutting resistance is large, and unstable cutting with large fluctuation in resistance occurs, and it is difficult to secure accurate machining. Further, in consideration of the variation in the cutting allowance due to the variation in the shapes of the rough cutting blade 11 and the broach 2, as shown in FIG. 1, the broach 2 is divided into a region D having a shearing angle and a region C having no shearing portion. Since it is desirable to have the alignment, the processing of the asymmetrical groove can be performed accurately.

According to one embodiment, a blade portion having a shear angle is arranged in front of a flat blade portion having no shear angle, and is integrally formed with a rod-shaped tool base having a convex cross section. As a result, rough finishing and the remaining finishing allowance are separately processed for the blade part with a shear angle and the flat tool part, which can prevent overcutting and achieve accurate cutting of groove planes. it can.

Further, in addition to the vane groove having an asymmetrical shape, it can be applied to broaching of a groove plane having a wide asymmetrical shape, and has an effect that a highly accurate planar shape can be obtained.

〔The invention's effect〕

As described above, according to the present invention, the machining tool is a rod-shaped tool having a convex cross section in which a blade portion having a shear angle is arranged in front of a blade portion having no shear angle. By constructing it integrally with the base body, it is possible to prevent over-cutting, perform accurate asymmetric groove machining, and fix the machining tool to the tool holder from the discharge hole side to prevent tool deformation due to cutting resistance during machining. It is possible to provide a processing tool mounting means for an asymmetrical groove, which does not cause an uncut residue and has a better planar precision of the asymmetrical groove by pressing.

[Brief description of drawings]

FIG. 1 is an explanatory view comparing an embodiment of a processing tool for an asymmetric groove according to the present invention with a conventional device, and FIG.
2 is a side view showing an embodiment of an asymmetric groove machining tool according to the invention of FIG. 1, (a) is a side view showing an example of a conventional device, (b) is a front view, (c) is a plan view, and FIG. FIG. 4 is a diagram for explaining a working state of the embodiment when the broach is removed, in comparison with a working state of the conventional apparatus. FIGS.
(E) shows the processing state according to the above-mentioned embodiment, respectively.
FIG. 3 is a perspective view showing the same tool layout, FIG. 4 is a perspective view showing an example of a conventional tool layout for broaching, and FIG. 5 is a view showing the broach holder of FIG.
(A) is a side view showing the tool layout of the brooch,
(B) is a cross-sectional view taken along line BB of (a), (c) is A2 of (a).
6 is an enlarged view seen from the arrow direction of FIG. 6, FIG. 6 is a view showing an example of a conventional broach, (a) is the same side view, (b) is the same front view,
(C) is the same plan view, FIG. 7 is an explanatory view of a processing state when the conventional device is pulled out, (a) is a front view, (b) is a right side view,
(C) is a left side view, (d) is a bottom view, FIG. 8 is a front sectional view showing a mounting state of a conventional broach, and FIG. 9 is a front sectional view for explaining an uncut portion due to deformation of the broach. . 1 ... Brooch holder, 2 ... Brooch, 3 ... Workpiece, 3a ... Vane groove, 3b ... Long groove side, 9 ... Screw, 12 ... Tool base, 12a ... Projection, C: blade without shear angle, D: blade with shear angle, θ ...
… Shear angle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Yokotagawa 3-18-1, Oga, Shizuoka-shi, Shizuoka Mitsubishi Electric Corporation Shizuoka Works (56) Reference JP-A-60-232818 (JP, A) 52-86088 (JP, U)

Claims (1)

[Claims] 1. A machining tool for finishing a groove having an asymmetrical shape formed in a workpiece with higher accuracy, which is provided on each of left and right side surfaces of a bar-shaped tool base having a convex cross section. A tool for forming an asymmetrical groove, characterized in that a blade portion having a shear angle is arranged in front of the blade portion having no shear angle, and is configured integrally with the tool base.