JPS6327123B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for creating so-called twisted stirring blades used in stirrers, mixers, etc. This is used for cutting and creating the twisted curved surfaces of planar type stirring blades, which have two or more twisted curved surfaces on the circumferential side in order to maintain the material feeding function and to make the surfaces of the stirring blades clean each other. be.

(Prior art) As a prior art related to the processing of this type of twisted stirring blade, there is
Publication No. 42476 and Special Publication No. 56-23743 exist.

The above-mentioned Japanese Patent Publication No. 54-42476 discloses a ship-shaped top surface 3, bottom surface 4, side surface B, as shown in FIGS. 4 and 5.
A twisted stirring blade 1 having a thickness E, a helix angle A, and a shaft hole 2 has a ship-shaped surface equal to the top surface 3 with its center M
It was developed with the focus on the fact that it is a solid that can be obtained by helical displacement using the normal line erected on the helical axis as the helical axis.

Specifically, as shown in FIGS. 6 and 7, a rotary cutter 6 with an inner radius equal to the radius of the circular arc C of the twisted side surface B is rotatably supported, and X, Y, and Z axes are mounted below it. A support base 7 which can be moved and rotated in the direction is provided, and a disk or twisted blade material 5 is attached thereon. And rotary cutter 6
While rotating, the support stand 7 is advanced in the Y-axis direction according to the cutting allowance of the cutter, and first, the first arcuate edge curve C is cut and formed. Next, the cutter 6 is lowered by the pitch, and the support stand 7 is rotated by a minute angle α using the center M of the material 5 as a fulcrum, and the support stand 7 is sequentially moved in the Y-axis direction in the same way as described above. An arcuate edge curve C′ is formed by cutting. By repeating such operations, a twisted curved surface (twisted side surface B) of the stirring blade 1 is formed.

In the method described above, the support stand 7 is rotated by a constant angle around the center M of the material 5 as a fulcrum, but the feed of the material 5 in the radial direction on the XY plane is The angle .alpha. may be changed by a small amount for each descending pitch, or it is also possible to combine the rotation method of the support table 5 and the change in the feeding angle of the material 5 in the radial direction.

On the other hand, Japanese Patent Publication No. 56-23743 discloses a fixed outer cylinder 9 having a spiral guide groove 8, as shown in FIG.
Insert the spindle 11 with the guide pin 10 provided therein, engage the pin 10 with the guide groove 8, and
The twisted blade material 5 fixed to the tip of the spindle 11 is cut by a cutter 6 attached to the rotating main shaft 12 via a holder 13.

That is, the rotation radius R of the cutting edge of the cutter 6 is adjusted so as to cut the arcuate edge curve C of the top surface 3, and after cutting the curve C, the spindle 11 is rotated by a certain angle. As a result, the material 5 rotates by a certain angle, and the material 5 also advances a certain distance together with the spindle 11 according to the shape of the guide groove 8, dividing the thickness E between the top surface 3 and the bottom surface 4 in multiple stages. This means that the process has proceeded to the generation cutting position of the first stage line among the many virtual cutting lines.

By the same operation, spindle 1
If you turn 1 and cut with cutter 6,
Material 5 moves from the initial position to the most advanced position (dotted line position)
When this is reached, the side surface B with the required torsional curved surface is created by cutting.

The method and apparatus for manufacturing a twisted stirring blade described above are excellent in mass productivity in manufacturing small twisted stirring blades, and have high practical utility.

However, in all of the above techniques, the material 5 of the twisted blade is fixed and the twisted side surface B is cut and created by rotation of the rotary cutter 6, so the rotation radius is extremely large for manufacturing large-sized twisted blades. A rotary cutter 6 with a large radius is required. That is, as the radius of curvature R of the arcuate edge curve C of the twisted side surface B increases, the rotation radius of the rotary cutter 6 needs to have the same dimension as the radius of curvature R, so the cutter device becomes extremely large. This method has the disadvantage of causing various problems in mechanical aspects and processing accuracy.

Furthermore, in the aforementioned Japanese Patent Publication No. 56-23743,
Although the rotation of the spindle 11, that is, the rotation of the material 5, and the feed distance of the material 5 are synchronized,
The rotation of the cutter 6 and the rotation of the material 5 are mechanically independent, and as a result, it is difficult to maintain synchronization between the rotation of the cutter and the rotation of the material 5, resulting in highly accurate twisting. There are disadvantages in that it becomes difficult to generate the curved surface B by cutting, and the rotating device for the spindle 11 becomes complicated and expensive.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems in manufacturing conventional twisted stirring blades. The cost increases, work efficiency and cutting accuracy decrease, and the rotation device of the spindle 11 becomes complicated, making precise rotation control difficult. This is intended to solve problems such as the difficulty of maintaining a stable synchronized relationship with the rotating angle of the material 5, and to support the cutter blade or polishing tool so that they can move freely without rotating. At the same time, the material 5 with twisted blades is rotatably supported on a rotating drum that rotates at a constant speed, and the material 5 itself is rotated at an extremely low speed and cut while the drum rotates, thereby producing a large-sized torsional agitation. The present invention provides a creation processing machine for twisted stirring blades that allows blades to be manufactured with high precision and high efficiency.

(Means for Solving the Problems) The present invention includes: a rotatable drum body 14 that is rotatably supported; a drive device 18 that rotationally drives the rotary drum body 14 at a constant speed; and a center of the rotary drum body 14. A sun gear 23 is rotatably fitted loosely into one end of the shaft 15 and has a differential gear 24 integrally formed on the same axis.
and; a gear that is inserted through the rotating drum body 14 and rotatably supported therein, has a twisted blade material 20 fixed to one end thereof, and meshes with the sun gear 23 at the other end and has the same number of teeth. a workpiece mounting shaft 19 to which 21 is wedged; and a rotary transmission mechanism 2 that transmits a rotational force in the same direction at a slightly different rotational speed than the rotational speed of the rotary drum body 14 to the differential gear 24.
2; the rotary drum body 1 to the rotary transmission mechanism 22;
a drive device 31 that supplies the same rotational input as the rotational input to the material 20 ;
Cutting or polishing by rotating the
The polishing tool 32 is the basic structure of the invention.

(Function) When the rotary drum body 14 is rotated at a constant speed by the drive device 18, the sun gear 23 meshing with it via the gear 21 also rotates at the same speed.

On the other hand, the sun gear 23 is connected to the differential gear 24 integrally formed with the sun gear 23 in the same rotational direction as the sun gear 23 via the rotary transmission mechanism 22.
A rotational force with a rotational speed slightly changed from the rotational speed is applied. As a result, the gear 21 rotates at a rotational speed corresponding to the difference in rotational speed between the sun gear 23 and the differential gear 24, and the workpiece mounting shaft 1
9 rotates, and the material 20 attached to it is displaced by minute angles.

Therefore, by moving the cutting/polishing tool 32 in the direction of the arrow in FIG. 2 (Z-Z axis direction in FIG. 7) in accordance with the amount of displacement of the material 20, a predetermined twisted curved surface B can be easily formed. It is created and processed accurately.

(Example) FIG. 1 is a schematic plan view of a creating processing device for a twisted stirring blade according to the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. 1.

In the figure, 14 is a rotating drum body, which is rotatably supported by a machine stand (not shown) via a central shaft 15, a bearing 16, etc. Further, a driving worm wheel 17 is fixed to the outer peripheral wall of the rotating drum body 14, and is rotated at a constant speed in the direction of the arrow by a driving device 18 such as a driving worm that meshes with the driving worm wheel 17. Workpiece mounting shafts 19, 19 are arranged symmetrically on the central axis of the drum body, and are inserted through the rotary drum body 14 and rotatably supported thereon. Reference numerals 20 and 20 are materials for twisted blades fixed to one ends of the workpiece mounting shafts 19 and 19, and gears 21 are wedged to the other ends of the workpiece mounting shafts 19 and 19, respectively. The twisted blade material 20 is formed into a shape similar to the twisted blade to be manufactured in advance by casting or the like.

23 is a sun gear loosely fitted to the drum support shaft 15 so as to be rotatable; the sun gear 23 has the same number of teeth as the gear 21 at the end of the workpiece mounting shaft 19; They are arranged in a straight line and interlock with each other.

24 is a differential gear formed integrally with the sun gear 23, and the differential gear 24 has a support shaft 25.
A gear 26 that is loosely fitted is in mesh with the gear. Further, a gear 27 is integrally formed with the gear 26, and a gear 29 loosely fitted onto the support shaft 28 meshes with the gear 27. 30 is a drive worm wheel formed integrally with the gear 29, and each gear 2
6, 27, support shafts 25, 28, etc., constitute a rotary transmission mechanism 22.

31 is a drive device such as a drive worm, which supplies the same rotational input as the input to the rotary drum body 14 to the rotary transmission mechanism 22. That is, the drive device 31 and the drive device 18 for the rotary drum body 14 are rotationally driven by the same drive shaft, and the rotational input to both the drive worm wheels 17, 30 is the same. (That is, the worm ratio between the drive device 18 and the drive worm wheel 17 and the worm ratio between the drive device 31 and the drive worm wheel 30 are the same).

The number of teeth of the gear 24 of the rotary transmission mechanism 22 is a,
Assuming that the number of teeth of the gear 26 is b, the number of teeth of the gear 27 is c, and the number of teeth of the gear 29 is d, in this embodiment, the gear train is a=76, b=75, c=84, and d=85, respectively. Therefore, the speed change rate β of the gear 24 is β=a/b・c/d=76/75・84/85=
It has become 1.0014117. As will be described later, the number of teeth of each gear constituting the rotary transmission mechanism 22 and the number of stages in combination thereof can be arbitrarily selected, and an appropriate speed change rate β can be selected depending on the required rotational speed of the material 20.
is selected.

32, 32 are cutting tools such as cutters and grindstones arranged symmetrically on the central axis of the rotating drum body 14.
It is a polishing tool, and is used in the vertical direction (Z-Z in Figure 7).
axial direction) and longitudinal direction (Y-Y in Fig. 7)
It is supported so that it can move freely at a fixed pitch in the axial direction.

Next, the operation of this embodiment will be explained. First, the materials 20, 20, which have been formed in advance into a shape substantially similar to a twisted blade, are fixed to both workpiece mounting shafts 19 with mounting bolts 33 or the like. Next, both the cutting/polishing tools 32, 32 are positioned on the top side of the materials 20, 20, and the distance R between the cutter 32 and the center O of the drum body 14 becomes the basis of the twisted side surface B to be formed. Both drive devices 18 and 31 are rotated so that the diameter becomes equal to the diameter of the arcuate edge curve C.

Due to the rotation of the drive device 18, the rotating drum body 14
is rotated at a constant speed, and the material 20 is cut and
It is cut by the polishing tool 32, and the first arcuate edge curve C of the twisted side surface B is created by cutting.

On the other hand, due to the rotation of the rotating drum body 14 in the direction of the arrow, the gear 2 attached to the end of the workpiece attachment shaft 19
The sun gear 23 meshing with this via 1 also rotates in the direction of the arrow. At this time, due to the input from the drive device 31, a rotational force in the direction of the arrow is also applied to the gear 24 via the gear 29, the gear 27, and the gear 26.
If the rotational speed of the gear 24 driven by is the same, the workpiece attachment shaft 19 will not rotate (that is, the material 20 will not rotate).

However, the rotation speed of the gear 24 due to the rotation input from the drive device 31 is β=1.0014117 as described above.
As a result, the sun gear 23 has β=a/b・c/
It rotates (rotates) in the direction of the arrow by a gear ratio of d=1.0014117.

Since the workpiece mounting shaft 19 rotates continuously at a speed corresponding to the B value while the drum body 14 is rotating, the cutting/polishing tool rotates in synchronization with the rotational change of the mounting shaft 19. 32 By lowering the stirring blade at a constant speed, a twisted side surface B consisting of a large number of arcuate edge curves C, C', C'', which divide the thickness between the top and bottom surfaces of the stirring blade into multiple stages, is created. It is formed by cutting or polishing.

In this embodiment, the number of teeth of each gear 24, 26, 27, 29 of the transmission mechanism 22 is determined so that β>1, but the number of teeth is set so that β<1. It is also possible to do this, and in this case, since the direction of rotation of the workpiece mounting shaft 19 is reversed, the direction of movement of the cutting/polishing tool 32 must also be reversed to that described above.

Further, in this embodiment, the rotating drum body 14 is vertical and the material 20 is placed on the end surface of the drum, but it goes without saying that the rotating drum body 14 may be configured to be rotatably supported horizontally. It is.

Furthermore, in this embodiment, two workpiece mounting shafts 19,
19 is provided on the rotating drum body 14, but there may be only one mounting shaft 19, or three or four mounting shafts 19 may be arranged on an arc at equal intervals and meshed with the sun gear 23. A gear may be provided at each shaft end to process a large number of materials 20 at the same time.

(Effects of the invention) Since the present invention has a structure in which the material to be processed is rotated, large-sized stirring blades can be manufactured without requiring a large rotary cutter unlike the conventional processing technology for this type of stirring blades. This also makes it possible to reduce manufacturing costs.

In addition, in the present invention, the speed change given to the sun gear, that is, each gear 2 constituting the transmission mechanism 22
By changing the number of teeth 4, 26, 27, and 29 and the number of gear combinations, the amount of displacement of the material 20 can be freely selected, and the rotation speed (i.e. cutting or polishing speed) of the material 20 and the material A constant synchronous relationship can always be maintained between the amount of displacement (namely, the amount of rotation of the mounting shaft). As a result, the machining accuracy of the twisted side surface is significantly improved, and the finish of the outer surface is extremely smooth.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a creating machine for twisting stirring blades according to the present invention, and FIG.
-A sectional view. FIG. 3 is an explanatory diagram showing the meshing state of each gear. FIG. 4 is a schematic plan view of a stirring blade having two twisted side surfaces, and FIG. 5 is a front view thereof. Figure 6 is a schematic diagram of the stirring blade creation process in Japanese Patent Publication No. 54-42476.
FIG. 7 is an explanatory diagram of the stirring blade creation process in Japanese Patent Publication No. 54-42476. Figure 8 is the special public service issued in 1984.
It is a side view of the main part of the stirring blade creation processing device in No. 23743. 1... Twisted stirring blade, A... Twisted angle, B... Twisted side surface, C... Arc-shaped edge curve of twisted side surface, β...
Speed change rate, 14... Rotating drum body, 15... Center shaft, 18... Drive device, 19... Workpiece mounting shaft, 20
...Twisted blade material, 22...Rotary transmission mechanism, 23
... sun gear, 24 ... differential gear, 31 ... drive device,
32...Cutting/polishing tool.

Claims (1)

[Claims] 1. A rotating drum body 14 rotatably supported;
a drive device 18 that rotationally drives the rotating drum body 14 at a constant speed; a central axis 1 of the rotating drum body 14;
a sun gear 23 which is rotatably loosely fitted to one end of the rotary drum body 14 and is integrally formed with a differential gear 24 on the same axis; a workpiece mounting shaft 19 to which a blade material 20 is fixed, and a gear 21 meshing with the sun gear 23 and having the same number of teeth attached to the other end; a rotating drum body 1 to the differential gear 24;
a rotary transmission mechanism 22 that transmits rotational force in the same direction at a rotation speed slightly changed from the rotation speed of 4; a drive device that supplies the rotational input to the rotary transmission mechanism 22 with the same rotational input as the rotational input to the rotary drum body 14; 31
and; a cutting/polishing tool 32 disposed near the rotating drum body 14 so as to be movable in at least one direction, and cutting or polishing the material 20 by rotating it.