JP2521446B2 - Method and device for cutting work pieces such as impellers - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of cutting a work piece such as an impeller and an improvement of the apparatus.

[Conventional technology]

The conventional cutting device, as shown schematically in FIG. 11,
The general-purpose horizontal milling machine in the configuration provided with the general-purpose horizontal milling machine 19 and the indexing table 20 installed on the table 18.
While attaching the rotary cutter 22 to the main spindle 21 of 19 and fixing the workpiece 2 on the indexing table 20, while rotating the rotary cutter 22 at a preset number of revolutions, the general-purpose horizontal milling machine 19 is laterally fed by the driving force of the motor 23 to cut the workpiece 2. The cutting process will be briefly described. When the cutting at the first position is completed, the general-purpose horizontal milling machine 19 is retracted to a predetermined position, and the workpiece 2 is moved to the next cutting position by the indexing table 20. The general-purpose horizontal milling machine 19 is rotated again to carry out the next cutting, and the work 2 is cut by repeating this. The two-dot chain line in the figure indicates the position of the general-purpose horizontal milling machine 19 in the cutting state.

In the cutting device having the above structure, after cutting the upper surface of the workpiece 2, it is necessary to turn the workpiece 2 over and replace it in order to cut the lower surface. The cutting position is misaligned, making it difficult to obtain highly accurate products. Therefore, there is a large variation in quality, and it takes a considerable amount of time to turn over the work piece 2 after finishing the cutting on one side and accurately adjust the cutting position, and a complicated and expensive mechanism is required to automate this process. And

[Problems to be Solved by the Invention]

The present invention is intended to solve the above-mentioned problems and to obtain a product with high accuracy and stable quality, and at the same time, to shorten the processing time and reduce the cost.

[Means for solving the problem]

That is, the present invention uses a pair of rotary cutters that are integrally connected and arranged so as to face each other across a workpiece at a predetermined processing position, and these rotary cutters act alternately on the workpiece. In addition, the invention provides a method for indexing and rotating the workpiece to form a required number of cutting grooves all around the workpiece and an apparatus for carrying out this method.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a front view of the cutting device according to the present invention, FIG. 2 shows a left side view of FIG. 1, and FIG. 3 shows a rear view of FIG. 1. The outline of the configuration of the present invention is as follows. It looks like.

Guide rails on slide table 25 with pedestal 24
26 is provided, and the workpiece support base 1 is installed on the guide rail 26 so as to be movable between a predetermined machining position and a take-out position. A guide block 27 is provided below the workpiece support base 1 in order to move the workpiece support base 1 along the guide rails 26. The workpiece support base 1 shown in FIG. 1 is in the take-out position.

The workpiece support base 1 is provided with an indexing rotation mechanism 5 having a support member 9, and above the support member 9 a clamp device 10 for fixing the workpiece 2 under pressure is provided.
Located on top. As shown in FIG. 10, a workpiece fixing member 17 is movably connected to the tip of the sliding member 15 of the clamp device 10 via a connecting member 16, and the workpiece is fixed by a spring 28. The unnecessary rattling of the member 17 can be suppressed.

The position of the workpiece support base 1 shown in FIG. 6 corresponds to the machining device, but at this predetermined machining position, the pair of rotary cutters 3 and 4 are almost vertically arranged so as to face each other around the workpiece 2. They are arranged at the same distance and on the same plane. As a drive device for rotating the pair of rotary cutters 3 and 4 at an appropriate rotational speed, a motor 29 is a V drive.
The connecting shaft (main shaft) 8 is connected via the belt 30. Further, the main shafts 12 and 13 of the rotary cutter are connected by a gear 31 so as to rotate in opposite directions, and at the same time, these main shafts 12 and 13 are
Is also connected to the connecting shaft 8 by gears 32 and 33. The connecting portion of the gears 31, 32, 33 described above is housed in the gear box 34 and is supported by the spindle support base 35. The details of the cross section of the gear box 34 taken along the line AA are described in Section 9.
Shown in the figure. The gearbox 34 is provided with bearings 36 that support the main shafts 12 and 13 and the connecting shaft 8.

In the embodiment shown in FIG. 1, FIG. 2 and FIG. 3, a pair of rotary cutters 3, 4 are connected by a connecting shaft 8 on the side of the workpiece 2 so as to integrally swing. But
The operation of the rotary cutters 3 and 4 is not limited to the rocking motion, but may be a vertical motion as described later. In order to move the pair of rotary cutters 3 and 4 up and down to a predetermined cutting position, a hydro cylinder 37 is used as an operating mechanism 14 that moves the gear box 34 up and down as a whole, and is operated hydraulically. . The drive shaft 38 of the hydro-cylinder 37 is rotatably connected to the gear box 34, while the main body side is swingably fixed to the entire cutting device by a connecting pin 39.

The adjusting rod 40 is for adjusting the amplitude of the oscillating motion of the rotary cutters 3 and 4, and adjusting the cutting amount of cutting, and the positioning of the processing position is performed by rotating the handle 42 by the positioning device 41, This is performed by adjusting the position of the workpiece support base 1. Also, the gear box 34 and the mount
The spring 44, which is connected to the motor installation base 43 fixed to the 24, is provided for the purpose of adjusting the center of gravity of the gearbox 34 in order to facilitate control of the swinging motion of the gearbox 34. There is. Further, the limit switch 45 is fixed to the spindle support base 35.
The operating piece 47 for pushing the operating shaft 46 of the gearbox 34
It is fixed to the side. Further, the cutting device of the present invention is provided with the intermediate position fixing device 48 for the rotary cutters 3 and 4, and the V belt 30
It has pulleys 49 and 50 for hanging.

Next, the operation and operation of the present invention will be described. FIG. 5 is a flow chart showing the operation of the cutting device according to the present invention. When cutting an impeller as shown in FIG. 4 as an example of the work piece 2, first, the work piece 2 is clamped on the support member 9 of the work piece support base 1 as shown in FIG. It is pressure-fixed at a predetermined position through the workpiece fixing member 17 at the tip of. As shown in FIG. 1, the clamp device 10 is provided with a fixing recognition device 11 for discriminating that the work piece 2 is pressure-fixed at a predetermined position, and the work piece 2 is fixed at a predetermined position. When the object 2 is not fixed under pressure, the next cutting process is not performed. The rail 51 is for changing the mounting position of the fixing confirmation device 11, because the pressurizing and fixing position of the rail 51 changes depending on the thickness of the workpiece 2.

After confirming that the workpiece 2 has been pressed and fixed in a predetermined position, the workpiece support base 1 is moved to the processing position shown in FIG. The positioning of the processing position is adjusted by the positioning device 41 as described above.

Next, in the cutting process, the pair of rotary cutters 3 and 4 may be oscillated as shown in FIG. 7 or may be vertically moved as shown in FIG. . Since the workpiece 2 may be cut first from the top or bottom, for example, the upper rotary cutter 3 cuts the upper surface 6 of the workpiece, and the lower rotary cutter 4 cuts the lower surface 7 of the workpiece. The rotary cutters 3 and 4 are alternately acted on the workpiece so as to form a cutting groove having a desired shape.
7 (a) and 8 (b) show the state in which the upper surface 6 is being cut, and (b) shows the state in which the lower surface 7 is being cut. When cutting from the upper surface 6 first, the upper rotary cutter 3 lowered at an appropriate feed speed
After cutting the upper surface 6 with, fast-return to the intermediate position shown in FIG. 6, this time lower surface 7 is cut with the lower rotary cutter 4 raised at an appropriate feed speed, and then fast-forward again to the intermediate position. Back. After both sides are cut as described above, the index rotating mechanism 5 rotates the workpiece 2 to the next cutting position. At this time, if the operating piece 47 is fixed to an appropriate position of the gear box 34, the operating shaft 46 of the limit switch 45 provided for intermediate positioning will move the pair of rotary cutters 3 and 4 to an almost intermediate position. When the limit switch 45 is activated, the limit switch 45 is activated (see FIG. 6,
(See FIGS. 7 and 8).

When the desired cutting is completed by repeating the above steps, the workpiece support base 1 is moved to the take-out position, the workpiece 2 is removed, and all the steps are completed. In addition, the intermediate position fixing device 48 fixes the rotary cutters 3 and 4 to the intermediate position when the workpiece support base 1 is moving between the processing position and the unloading position, or is in the unloading position to improve work safety. I am raising. Further, it is preferable to cover the cover in the vicinity of the processing position or to provide a chip storage device so as to enhance the safety in work and the like, depending on the implementation.

FIG. 4 shows a processing example in which a large number of cutting grooves for forming an impeller are provided as described above.

Next, a case where gun metal is used as the material of the workpiece will be described as an example. When the diameter D of the rotary cutter is set to 50 mm and the number of blades is set to 40, the feed amount of the rotary cutter per blade is about 0.01 mm, and when the cutting speed V is 180 m / min, the rotation speed N of the rotary cutter is , N = V ÷ (D × 10 ^-3 × π) = 180 ÷ (50 × 10 ^-3 × π) = 1146 rpm. The feed rate of the rotary cutter is adjusted by the flow rate of the working fluid (oil) sent to the hydro cylinder 37, and the cut rate is adjusted by adjusting the diameter of the pulleys 49, 50 or the rotation speed of the motor 29.

〔The invention's effect〕

Since the present invention has the above-mentioned configuration, the following effects can be obtained as compared with the conventional cutting method and its apparatus.

First, the processing accuracy can be further improved. When installing the rotary cutter, if they are mounted on the same plane with high accuracy and connected integrally, both sides of the work piece are cut at the same indexing rotation position, so there is no deviation in the cutting positions on both sides. As a result, machining accuracy is improved and quality variation is eliminated.

Moreover, since both sides of the work piece are cut at one indexing rotation position, the time and labor required to change the work piece as in the past can be saved, and not only the number of processing steps can be reduced, but also the processing time can be shortened. This will greatly improve productivity.

Further, since the pair of rotary cutters are integrally connected and arranged, when one of the rotary cutters moves forward with respect to the workpiece, the other rotary cutter retracts from the workpiece and the other rotary cutter moves. When moving forward with respect to the work piece, one of the rotary cutters is set back from the work piece, and the pair of rotary cutters are moved forward and backward together, greatly reducing the processing time. can do.

[Brief description of drawings]

1 is a front view of the cutting device according to the present invention, FIG. 2 is a left side view of the cutting device of FIG. 1, and FIG. 3 is a rear view of the cutting device of FIG. FIG. 4 is an example of a workpiece, (a) is a longitudinal sectional view and (b) is a plan view. FIG. 5 is a flow chart showing the operation of the cutting device according to the present invention. FIG. 6 is a front view showing the outline of the vicinity of the machining position of the cutting device according to the present invention, and FIGS. 7 and 8 are mechanism diagrams showing the cutting operation of the cutting device according to the present invention. FIG. 9 is a sectional view showing details of the gearbox in a section taken along the line AA of FIG. 1, and FIG. 10 is a longitudinal sectional view showing a state of a portion to which the workpiece is pressed and fixed, and FIG. FIG. 6 is a front view of a conventional cutting device. 1 ... Workpiece support base, 2 ... Workpiece 3 ... Upper rotary cutter, 4 ... Lower rotary cutter 5 ... Indexing rotation mechanism, 6 ... Workpiece upper surface 7 ... Workpiece Lower surface of the object, 8 ... Connection shaft (spindle) 9 ... Supporting member, 10 ... Clamping device 11 ... Fixing confirmation device, 12, 13 ... Spindle 14 ... Cutter operating mechanism ... Sliding member 16 ... … Connecting member, 17 …… Workpiece fixing member

Claims (3)

(57) [Claims] 1. A pair of rotary cutters 3 and 4 which are integrally connected and arranged so as to face each other across a workpiece 2 at a predetermined processing position, and these rotary cutters 3 and 4 are used for the workpiece. A method for cutting a work piece such as an impeller, characterized in that the work piece (2) is alternately acted on and the work piece (2) is indexed and rotated to form a required number of cutting grooves on the entire circumference. 2. A workpiece support base 1 that moves between a predetermined machining position and a take-out position while holding the workpiece 2 is mounted, and the workpiece 2 is sandwiched at the machining position. As opposed to each other, a pair of rotary cutters 3 and 4 are integrally connected and arranged, and a cutter operating mechanism 14 that causes the rotary cutters 3 and 4 to interact with the workpiece 2 and the cutter operating mechanism 14 A cutting device for a workpiece such as an impeller, comprising an indexing rotation mechanism 5 for synchronizing and rotating the workpiece 2. 3. A pair of rotary cutters 3, 4 are interlockingly connected so as to rotate in opposite directions, and these rotary cutters as a whole are connected.
3. The impeller and the like according to claim 2, wherein the supporting shafts 3 and 4 are supported by a connecting shaft 8 on the side of the workpiece 2 so as to be able to integrally swing. Cutting equipment for workpieces.