JPS61142067A - Generatingly machining device for twisted churning blade - Google Patents

Abstract

PURPOSE:To improve machining accuracy by varying the part of change in speed to be given to a sun gear to freely select the quantity of displacement of a material, while always maintaining the rotation speed and the quantity of displacement of said material in a certain synchronized relationship. CONSTITUTION:When a rotary drum body 14 is rotated at a constant speed by means of a driving device 18, a sun gear 23 is also rotated via a gear 21. On the other hand, a turning force which is in the same direction as the sun gear 23, while the rotation speed of which is slightly varied from that of the sun gear, is given to a differential gear 24 provided in an integrated form with the sun gear 23, via a rotation speed change mechanism 22. And, thereby, the gear 21 rotates on its own axis at a rotation speed corresponding to difference in rotation speeds between the sun gear 23 and the differential gear 24, to rotate a workpiece mounting shaft 19, causing a material 20 mounted on the shaft 19 to be continuously displaced by a minute angle. Thereby, a cutting and polishing tool 32 is moved in line with the quantity of displacement of the material 20, to carry out generating machining of a defined twisted curved surface simply and accurately.

Description

Detailed Description of the Invention (Field of Industrial Application) 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 clean the surfaces of the stirring blades by themselves. be.

(Prior Art) As prior art related to the processing of this type of twisted stirring blade, there exist Japanese Patent Publications No. 42476/1983 and Japanese Patent Publication No. 23743/1989 published by the applicant of the present invention.

The above-mentioned Japanese Patent Publication No. 54-42476 has figures 4 and 5.
Top surface of the boat shape as shown in the figure 3. Bottom surface 4. Side B.

The twisted stirring blade 1, which has a thickness E, a helix angle A, and a shaft hole 2, is a three-dimensional shape obtained by helically displacing a ship-shaped surface equal to the top surface 3 with the normal line erected at its center M as a helical axis. It was developed with a focus on

Specifically, as shown in FIGS. 6 and 7, a rotary cutter 6 with an inner radius equal to the radius of the arc C of the twisted side surface B is used.
is rotatably supported, and X * Y
-Z A support stand 7 that can be moved and rotated in the horizontal direction is provided, and a disc or twisted blade element (No. 5) is mounted on it.Then, while rotating the rotary cutter 6, the support stand 7 is set to Accordingly, the cutter 6 is moved forward in the Y+1il11 direction to form the first arcuate edge curve C by l; The support base 7 is rotated by a small angle α as described above, and the support base 7 is sequentially moved in the Y-axis direction.
The next arcuate edge curve C' is formed by cutting. By repeating this operation τ*, the 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 chromaticity with the center M of the material 5 as a fulcrum;
The radial feed of the material 5 may be changed by a minute angle α for each downward pitch of the cutter 6, or the rotation method of the support base 5 and the radial feed of the material 5 may be It is also possible to combine this with an angular change.

On the other hand, Japanese Patent Publication No. 56-23743 discloses that a spindle 11 provided with a guide pin 10 is inserted into a fixed outer cylinder 9 having a spiral guide groove 8, as shown in FIG.
is engaged 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 body +M 1.2 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, and the thickness E between the top surface 3 and the bottom surface 4 is divided into multiple stages. This means that the process has proceeded to the generation cutting position of the first stage line among the virtual cutting lines.

By the same operation (a), by rotating the spindle 11 by a certain angle and cutting with the cutter 6, the element 4' dimension 5 reached the most advanced position (dotted line position) from the initial position. Sometimes a side surface B with the required torsional curved surface will be 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, the above technique i'f7 is all twisted feather element 1.
-15 is fixed and the twisted side surface B is cut and generated by rotation of the rotary cutter 6, so a rotary cutter 6 with an extremely large rotation radius R is required to manufacture large-sized twisted blades. . That is, if 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 must also have the same dimension as the radius of curvature R, so the cutter device becomes extremely large and difficult to operate. It has the disadvantage that it causes various problems in terms of drawing surface and day-to-day accuracy.

Further, in the above-mentioned Japanese Patent Publication No. 56-2374.3, the rotation of the spindle 11, that is, the rotation of the material 5, and the feed distance of the material 5 are synchronized, but the cutter 6
The rotation of the cutter 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 a highly accurate twisted curved surface B. There are disadvantages in that it becomes difficult to generate a cut, 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 the production of conventional twisted stirring blades. The cost increases and work efficiency and cutting accuracy decrease; ■ 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 of the twisted blade is rotatably supported on a rotary drum that rotates at a constant speed, and as the drum rotates, the material 5 itself rotates at both bottom speeds while cutting. The present invention provides a splitting machine for twisted stirring blades that can manufacture twisted stirring blades with high precision and efficiency.

(Means for resolving the problem) The present invention provides a rotating drum body (14) that is rotatably supported.
a drive device (18) for rotationally driving the rotating drum body (14) at a constant speed; )
Taiyo 113 wheel (23), which is formed integrally with coaxial -12
and; pushed through the rotating drum body (14) and rotatably supported thereon, fixing the material of the twisted feathers at one end, and meshing with the sun float (23) at the other end. A workpiece mounting shaft with a wedged float (21) having a number of
+cj) and; a rotary transmission (port structure (22)) that transmits a rotational force in the same direction at a rotational speed slightly different from that of the rotating drum body (14) to the differential 1゛4B wheel A.1). ;
a drive device (31) for supplying the same rotational input as the rotational input to the rotary drum body (14) to the rotary transmission 4 structure; disposed near the rotary drum body (14) so as to be movable in at least one direction; The basic structure of the invention is a cutting/polishing tool (droplet) for cutting or polishing the material by rotation of the material.

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

On the other hand, the differential gear 24 integrally formed with the thick I @ float 23
is applied with a rotational force through a rotary transmission mechanism 22 in the same rotational direction as the rotational direction of the solar iJJ city 23 and at a rotational speed slightly different from the rotational speed of the solar 1-1 car 23. As a result, the float 21 is the sun float 23 and the differential float 24.
As a result, the workpiece mounting shaft 19 rotates, and the workpiece 20 mounted thereon is displaced by minute angles.

Therefore, by moving the cutting/polishing tool 32 in the direction of the arrow in FIG. 2 (Z-2 axis direction in FIG. 7) in accordance with the amount of displacement of the material 20, the predetermined twisted curved surface B can be easily cut. , and the generating process is carried out accurately (Example) Fig. 1 is a schematic plan view of a generating processing device for a twisted stirring blade according to the present invention, and Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1. It is a diagram.

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 '1j&iM worm wheel 17 is fixed to the outer circumference of the rotating drum body 14, and is rotated at a constant speed in the direction of the arrow by a drive device 18 such as a drive worm that meshes with the '1j&iM worm wheel 17.

Reference numeral 19.19 denotes a workpiece mounting shaft which is arranged symmetrically on the first engagement line of the center of the drum body, and is inserted through the rotating drum body 120) and rotatably supported thereon. 20.

20 is a material of a twisted blade fixed to one end of the workpiece attachment shaft 1.9.19, and
1+], 9, and 19 are wedged with 1 and 1 wheels 21, respectively.

The material 20 of the twisted blade is formed into a form similar to the twisted blade to be pre-crimped by casting or the like.

23 is a thick VtJ (a wheel) rotatably loosely fitted onto the drum support shaft 15, and the sun float 23 has the same number of threads as the gear 21 at the end of the workpiece mounting shaft 19. The three parts are arranged in a straight line and interlock with each other.

24 is a differential float formed integrally with the thick U5 iU wheel 23, and a float 26 loosely fitted onto a support shaft 25 meshes with the differential float 24. In addition, the float 26 has 1
An east wheel 27 is integrally formed, and a gear 29 loosely fitted onto a support shaft 28 meshes with the float 27. 3o is the above 12
This is a driving worm wheel integrally formed with the single wheel 29, and the rotary transmission mechanism 22 is constituted by the gears 26, 27, the support shafts 25, 28, and the like.

Reference numeral 31 denotes a drive device such as a drive worm, which transmits the same rotational input as the input to the rotating drum body 14 to the four-speed variable-speed boat structure 22.
supply to That is, the drive device 31 and the rotating drum body 1
The drive devices 18 of No. 4 are rotationally driven by the same drive shaft, and the rotational input to the double-movement worm wheels 17 and 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 threads of the gear 24 of the rotary shift 1 pulling mechanism 22 is a, and the number of threads of the gear 24 is a, and the float 2
6, the number of teeth on the gear 27 is C2, the number of teeth on the gear 29 is d, then in this embodiment, the gear train is a=76, b-75.
, c = 84, and d = 85, respectively.
Therefore, the speed change rate β of one vehicle 24 is β=a/b@Ci=76/15・84/85−1001
4117 Ninatsute is here. As will be described later, the number of gears in each wheel constituting the rotary transmission mechanism 22 and the number of stages in combination can be arbitrarily selected, and an appropriate speed change rate β can be set depending on the required rotational speed of the material 20. Selected.

32. 32 is a cutting/polishing tool such as a cutter or a grindstone arranged symmetrically on the central axis of the rotating drum body 14;
'' It is supported so as to be movable with a certain pinch in the two downward directions (2-2 axis direction in FIG. 7) and the front-back direction (Y-Y axis direction in FIG. 7).

Next, the operation of this embodiment will be explained.

First, the material 20.20, which has been pre-swaged and formed into a shape substantially similar to a twisted blade, is fixed to the art work mounting shaft 19 with a mounting bolt 33 or the like. Next, the polishing tools 32, 32 on both sides are positioned on the top side of the material 20, 20, and the distance M R between the center cutter 32 and the center 0 of the drum body 14 is the basis of the twisted side surface B to be formed. The diameter of the arcuate edge curve C becomes equal to the diameter of the curve C, and both the moving devices 18 and 31 are rotated.

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

On the other hand, as the rotary drum body 14 rotates in the direction of the arrow, the sun 1 east wheel 23 that meshes with the workpiece attachment shaft 19 via the gear 21 attached to the end thereof also rotates in the direction of the arrow. At this time, according to the input from the drive device 31, the float 29, the float 2
7. A rotational force is also applied to the float 24 in the direction of the arrow via the float 26, and if the rotation speed of the sun float 23 and the rotation speed of the float 24 driven by the float 26 are the same, the work will be completed. There is no rotation of the object attachment shaft 19 (
That is, the material 20 does not rotate.)

However, due to the rotation input from the drive device 31, the float 24
Since the rotational speed of is given a slight change in speed 1y corresponding to β-1,0014117 as described above, as a result,
It rotates (rotates) in the direction of the arrow by a single wheel ratio of 1.0014117.

Therefore, the rotation of the workpiece mounting shaft 19 is caused by the rotation of the drum body 14.
During the rotation of B, the cutting/polishing tool 32 is lowered at a constant speed while synchronizing with the rotational change of the mounting shaft 19, so that the top surface of the stirring blade is A large number of arcuate edge curves C, C that divide the thickness between the bottom surface and the bottom surface into multiple stages.

The twisted side surface B consisting of C... is formed by cutting or polishing.

In this embodiment, the gear is changed so that β>■. U
1 unit each of grooves 22 (4 wheels 24, 26.27, 1 of 29)
13 has been determined, but it is also possible to set the number of ridges so that β is 1. In this case, the workpiece mounting axis 1
Since the direction of rotation of the cutting/polishing tool 9 is reversed, the direction of movement of the cutting/polishing tool 32 must also be reversed.

Further, in this embodiment, the rotating drum body 120) is vertical and the material 20 is placed on the end face of the drum, but the rotating drum body 120) may be configured to be rotatably supported horizontally. Of course.

Furthermore, in this embodiment, two workpiece mounting shafts 19, 1.9
are 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 a gear meshing with the sun float 23 may be provided. may be provided at each shaft end to process a large number of materials 20 at the same time.

(Effect of the invention) Since the present invention has a structure in which the workpiece material is rotated,
Unlike conventional processing techniques for this type of stirring blade, large-sized stirring blades can be manufactured without requiring a large rotary cutter, and manufacturing costs can also be reduced.

In addition, in the present invention, the speed change given to the sun gear, that is, each gear 24°26.27 that constitutes the transmission mechanism 22
．． By changing the number of 29 mountains and the number of tiers of floats,
The displacement amount of the material 20 can be freely selected, and the rotation speed of the material 20 (i.e., 1 degree of cutting or polishing) and the material 1
A constant synchronous relationship can always be maintained between the bolt and the displacement amount of the shaft (that is, the rotation type 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. 2 is a sectional view taken along the line A-A in FIG. 1. FIG. 3 is an explanatory diagram showing the meshing state of each gear. Figure 4 is a plan view of a stirring blade with two twisted side surfaces, and Figure 5 is its front view.Figure 6 is a process for creating a stirring blade 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. FIG. 8 is a side view of the essential parts of the stirring blade creation processing apparatus disclosed in Japanese Patent Publication No. 56-23743. 1 Twisted stirring blade A Twisted angle B Twisted side C Arc-shaped edge curve β of twisted side surface Speed change rate 4 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 float 31 Drive device 32 Cutting/polishing tool

Claims (1)

[Claims] A rotary drum body (14) supported rotatably; a drive device (14) that rotationally drives the rotary drum body (14) at a constant speed;
18) and; the central axis (15) of the rotating drum body (14)
a sun gear (23) which is rotatably loosely fitted to one end and is integrally formed with a differential gear (24) on the same axis; inserted through the rotary drum body (14) and rotatably supported thereon; is,
A workpiece mounting shaft (19) has a twisted blade material (20) fixed to one end, and a gear (21) that meshes with the sun gear (23) and has the same number of teeth as the sun gear (23) is wedged to the other end. a rotary transmission mechanism (22) that transmits a rotational force in the same direction at a rotation speed slightly different from that of the rotary drum body (14) to the differential gear (24);
2) a drive device (31) that supplies the same rotational input as the rotational input to the rotating drum body (14); disposed near the rotating drum body (14) so as to be movable in at least one direction; A torsional stirring blade creation processing device comprising a cutting/polishing tool (32) for cutting or polishing a material (20) by rotating it.