JPH0523750A - Automatic working device for turning-stopper or the like in shaft end part - Google Patents

Abstract

PURPOSE:To provide a device for performing automatically working of a turning-stopper, etc., on the shaft end part of a power transmission shaft, etc., of a reaper. CONSTITUTION:A shaft 3 to be worked of the lowest end engaged with the engaging part 2 of the lower end of an inclined supply base 1 is supplied onto an inversion lever 5 by a supply claw 4, positioning is executed by a pressing member 10 and a stopper 11 on the inversion lever concerned 5, and after positioning is completed, the shaft 3 to be worked is fixed completely by clamps 13, 13a, working of a turning-stopper, etc., is performed by advancing a working jig 14 to its end part 3a, and after working is completed, the shaft 3 is discharged by inverting the inversion lever 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic machining apparatus for performing spline machining as a rotation stop on both ends of a transmission shaft of a brush cutter, for example.

[0002]

2. Description of the Related Art In a transmission shaft 20 of a brush cutter, one end of which is connected to a drive device and the other end of which is connected to a brush cutter device, as shown in FIG. A spline 21 and a rectangular portion for forming are formed. Conventionally, the detents have been formed by cutting with a gear cutting machine, polyfiz machine or the like.

However, particularly in the case of a thin hollow transmission shaft, the necessary strength may not be obtained because the cross-sectional area of both ends is extremely reduced during cutting, and the number of processing steps for a solid shaft is also increased. I had a problem with. Therefore, the applicant of the present invention uses a hollow shaft for weight reduction, inserts a core rod having spline teeth with a diameter smaller than the inner diameter into the end of the hollow shaft, and plastically processes the end of the hollow shaft into a spline joint. Proposed to form a section (actual fair 2-20914
(See the official gazette).

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic machining apparatus for automatically and efficiently machining the shaft end portion of a spline or the like as described above.

[0005]

In order to achieve the above-mentioned object, the present invention relates to a supply base of a work shaft which is provided with a locking portion at its lower end and is inclined, and a supply table provided in front of the locking portion. A supply claw that rises from below the work shaft located at the lowermost end of the supply base and supplies the work shaft located at the lowermost end to the next step over the locking portion, and the supplied work product. Holds the shaft and reverses it after machining the end of the shaft to create a stocker
And a pressing member provided at one shaft end of the shaft to be machined received by the inversion lever for moving the shaft to a fixed position in the axial direction, and the pressing member. A stopper provided on the opposite side so as to be movable up and down to regulate the shaft to be processed to the fixed position, a clamp provided at a position before the stopper to completely fix the shaft to be processed, and a rear position of the stopper. And a processing jig, such as a rotation stopper, that is provided on the clamp side and advances toward the clamp side.

[0006]

In the present invention, when the shaft 3 to be processed is supplied to the slanted supply base 1, the shaft 3 to be processed is locked by the locking portion 2 at the lower end of the supply base 1 and aligned. Next, when the supply claw 4 is lifted, the shaft 3 to be machined located at the lowermost end is lifted and supplied to the reverse lever 5 over the locking portion 2. At the same time or in advance, the stopper 11 is lowered, and then the pressing member 10 is actuated so that one shaft end 3b of the shaft 3 to be processed is pressed by the pressing member 10 and the other shaft end 3a is pushed. It is moved until it comes into contact with the stopper-11.

Then, the clamps 13 and 13a are actuated to completely fix the shaft 3 to be processed. After that, the stopper 11 is pulled up, the processing jig 14 is advanced, and the shaft end portion 3a of the shaft 3 to be processed is processed. When the processing is completed, the processing jig 14 and the clamp 1
3, 13a and the like are returned, the reversing lever 5 is reversed, and the shaft 3 which has been processed is discharged from the discharge path 6 to a stocker (not shown). The present invention provides the pressing member 1
By adjusting the length of 0, adjusting the fixed portions of the clamps 13 and 13a, adjusting the lowering position of the stopper 11, and the like, it is possible to machine the shaft end portions of the shaft 3 to be machined having various lengths or diameters.

[0008]

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a side view of a main part of an apparatus according to an embodiment of the present invention, and FIG. 2 shows a perspective view of the main part. In the figure, reference numeral 1 denotes a supply base of a shaft 3 to be processed which is provided with a locking portion 2 at its lower end and is slightly inclined.
The shaft 3 to be processed is supplied with a slanting surface by its own weight so as to roll at a proper speed so as to be locked and aligned in parallel with each other from the locking portion 2 toward the front. In addition, a plurality of the supply bases 1 and the engaging portions 2 are arranged at appropriate intervals along the axial direction of the shaft 3 to be processed, and the side surfaces are inverted L-shape to supply the shaft 3 to be processed to the next step. In doing so, the shaft 3 rolls on its upper surface and is smoothly supplied to the next step.

Further, at a position before the locking portion 2, the processing shaft 3 located at the lowermost end on the supply base 1 is elevated from below and the processing shaft 3 at the lowermost end is locked by the locking portion. As in the case of the supply base 1 of 2, the supply claws 4 for supplying to the next step are provided over the inclined upper surface. The details are shown in FIGS. The vertical movement control of the supply pawl 4 is not shown in detail, but can be easily performed by a known motion conversion method such as a cam mechanism. Of course, the vertical movement control of the supply pawl 4 is interlocked with the movement of the reverse lever 5 and other parts described later at an appropriate timing. Further, it is not necessary to provide the supply claws 4 on the locking portions 2 respectively, and it suffices to provide the supply pawls 4 on the locking portions 2 on both shaft end portions 3a, 3b of the shaft 3 to be processed. That is the supply table 1
The same applies to the locking portion 2.

Further, it is suitable for receiving the shaft 3 to be machined which is supplied in parallel with the engaging part 2 beyond the engaging part 2 and reversing it after the completion of the machining and discharging the shaft 3 to be processed into a stocker. A number of reverse levers 5 are provided. The reversing lever 5 is formed in a substantially L-shape, and the L-shape is normally tilted slightly upward between the locking portions 2 and is fed on the upper surface of the locking portion 2. The processing shaft 3 is received and supported. Then, in accordance with the completion of machining of the shaft end portion 3a, which will be described later, it is reversed as shown in FIG. 8 and the shaft 3 to be machined is discharged from the discharge path 6 which is inclined similarly to the supply base 1 and the locking portion 2. It is configured to be discharged to a stocker (not shown).

The reversing control of the reversing lever 5 can be easily performed by a known method such as a cam or a crank. Further, as shown in FIG. 6, a pressing member 10 for moving the supplied work shaft 3 to a fixed position is provided on the shaft end 3b side of the work shaft 3 supplied on the reversing lever 5. In the case of the embodiment shown in the drawings, the plate 9 supported by the guide rod 8 is connected to the piston rod 7a of the air-cylinder 7,
The pressing member 10 attached to the plate 9 presses the shaft end portion 3b of the shaft 3 to be moved.

Further, the cylinder 7 of the shaft 3 to be processed.
On the side opposite to the above, a stopper 11 for restricting the movement of the shaft end portion 3a of the shaft 3 to be fixed to a fixed position is provided. The stopper 11 is configured to be vertically movable by an air cylinder 12, and is lowered to a fixed position of movement of the shaft end portion 3a prior to the movement of the shaft 3 to be processed by the pressing member 10.

Next, an appropriate receiving groove 13b for completely fixing the shaft 3 to be processed at a fixed position is provided at a position before the stopper 11.
A movable holding clamp 13a that is moved up and down by a clamp 13 provided with and a hydraulic cylinder 13c is provided. These clamps 13 and 13a are completely fixed so that the work shaft 3 moved to a fixed position by the stopper 11 and the pressing member 10 does not move at a predetermined position where the work shaft end portion 3a is projected by a predetermined length. Fix it. Furthermore, the stopper
A processing jig 14 such as a detent for advancing toward the clamps 13 and 13a is provided at the rear position of 11. The processing jig 14 is a drawing die having a molding die hole 14a for forming splines, and the clamps 13, 1
The shaft end 3a of the shaft 3 to be machined which is completely fixed by 3a is inserted into the molding die hole 14a, and the clamps 13 and 13a.
Is advanced by the hydraulic cylinder 15 toward the end surface of
A spline is formed on the shaft end 3a of the shaft 3 by plastic working.

As a simple example, the design items in the plastic working are calculated with respect to the solid long axis as follows. As a work piece, S45C-D, φ8 mm, (tensile strength = 90.9 kgf / mm ² , elongation = 12
%) And the force required for molding was measured to obtain the following calculation formula.

Deformation stress

[0016]

[Equation 1] If the processing strain is χ,

[0017]

[Equation 2] However,

[0018]

[Equation 3] S ₀ : Cross-sectional area of material S ₁ : Cross-sectional area after molding From the above, the shaft end of the solid long axis of the material φ8 mm is reduced in area 30
The force F required for molding to 100% is calculated.

[0019]

[Equation 4] Then, from the equations 2 and 3, the processing strain χ = 0.3567 and the deformation stress y = 55.9 kgf / mm ² . Therefore, F = y × S ₀ = 55.9 × 50.24 = 2,808k
It becomes gf. This force F is applied to the hydraulic cylinder 15 that pushes out the processing jig 14.
The oil pressure of can be measured and set.

On the other hand, the force required to clamp the shaft is
It is necessary to press the shaft with a force that does not cause the shaft to retreat during the molding with the molding force F. If this clamping force is P and the friction coefficient between the shaft and the clamp is μ, then P = F / μ, so if steel-to-steel μ = 0.11, then P = 2,808 ÷ 0.11 = 25,527 kgf is required.

The force P can be set by measuring the hydraulic pressure of the hydraulic cylinder 13c that pushes down the movable presser clamp 13a. From the above, the device was designed such that the force required for molding was 5 ton and the clamping force was 30 ton.

Further, since the work shaft should not be bent due to the influence of the clamp, the holder part needs to have a certain length. As the relationship between the clamp length L (mm) and the clamp force P (kg), L ≧ 0.007P was obtained as a result of the experiment. Therefore, the clamp length is set to 200 mm.

[0023]

According to the present invention, it is possible to automatically and efficiently process a spline or the like at the shaft end.

[Brief description of drawings]

FIG. 1 is a side view of a main part of an apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the apparatus shown in FIG.

FIG. 3 is a perspective view of a main part of a work shaft supply unit.

FIG. 4 is a perspective view of a locking portion and a supply claw portion of FIG.

FIG. 5 is a perspective view showing the operation of the supply claw in a state different from that in FIG. 4;

FIG. 6 is a perspective view of a reverse lever portion.

FIG. 7 is a perspective view of a clamp part.

FIG. 8 is a perspective view showing the action of the reversing lever.

FIG. 9 is a partially cutaway side view of an example of a transmission shaft of a brush cutter.

[Explanation of symbols]

 1 Supply Table 2 Locking Part 3 Worked Shaft 3a Shaft End 4 Supply Claw 5 Reverse Lever 7 Cylinder 10 Pressing Member 11 Stopper 13, 13a Clamp 14 Processing Jig

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[Procedure amendment]

[Submission date] September 18, 1991

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (1)

Claims: 1. A supply base 1 for a shaft 3 to be machined which is provided with a locking portion 2 at its lower end and is inclined, and a supply base 1 provided in front of the locking portion 2. A feed claw 4 that is raised from below the work shaft 3 located at the lowermost end and that feeds the work shaft 3 located at the lowermost end to the next step through the locking portion 2 and the supplied work claw 4. It receives the processing shaft 3 and the shaft end 3a
After completion of machining, the reversing lever 5 is reversed and discharged to the stocker, and the processed shaft 3 received by the reversing lever 5
A pressing member 10 provided on the side of one shaft end 3b for moving the shaft 3 to be processed to a fixed position in the axial direction;
A stopper -11 which is provided on the side opposite to 0 so as to be movable up and down and regulates the shaft 3 to be processed in the fixed position;
1. Clamps 13 and 13a provided at a position before 1 for completely fixing the shaft 3 to be processed, and a processing jig 14 provided at a position rearward of the stopper 11 for advancing to the clamp 13 side such as a detent. An automatic processing device that prevents rotation of the shaft end.