JPS5927728A - Manufacture of blade fitting of rotary harrow - Google Patents

Abstract

PURPOSE:To manufacture the blade fitting of a rotary harrow easily by inserting center dies which each have an arcuate notch atop into rectangularly sectioned die steel from both sides until they face each other at a center part, and pressing down an upper die equipped with a punch in a specific shape. CONSTITUTION:The die steel 15 which is sectioned rectangularly and has length double as great as necessary length is placed on a lower die 16 and the center dies 17 and 17 which each have the arcuate notch 18 atop are inserted from both-end opening parts so that their tip notch parts face each other. The arcuate notch 18 has the same curvature that the rotating shaft of the rotary harrow using the dies has. In this state, the upper die 24 is pressed down under hydraulic pressure, etc., to perform cutting with a punch 19 having an edge in a shape corresponding to the notch 18, and thus the arcuate notch 18 is formed; and then an insertion hole 6 for a blade fitting bolt is formed with a punch 20, thereby manufacturing the blade fitting easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blade mounting bracket for a rotary 710-, which is a soil crushing machine.

A rake harrow is an agricultural tool for breaking up and raking the plowed soil, and as shown in Fig. 1, the rotary shaft 1 is installed at the rear of a tractor, power tiller, etc., and blades 2 are shifted at predetermined intervals in the axial direction. They are installed radially.

By the way, the conventional metal fittings for attaching each blade 2 to the rotating shaft 1 are two U-shaped cross-sections with a notch 3 formed in the outer circumferential curvature of the rotating shaft 1 at one end, as shown in FIG. The shaped steel 4 is fitted and welded to form a substantially rectangular cross section, and this metal fitting A is set upright at a desired position on the rotating shaft 1 and welded, and the handle of the blade 2 is inserted into the fitting hole 5 of the metal fitting A. The blade 2 is attached to the rotating shaft 1 through the metal fitting A by inserting the bolt into the bolt/nut hole 6 of the metal fitting A and the hole of the blade 2 and tightening the nuts.

For this reason, two steps are required: shaping the steel mold 4, which has a U-shaped cross section, into a desired shape and welding the two steel molds together, making the work cumbersome. Therefore, simplification of manufacturing is desired.

In FIG. 6, reference numeral 7 indicates a projection for positioning the fitting A, and this projection 7 is fitted into a hole formed at a predetermined position of the rotating shaft 1.

This invention focuses on the fact that in recent years, shaped steel with a rectangular frame shape has been manufactured inexpensively and easily, and the shearing work has been improved.
The purpose is to solve the above problems by using the shaped steel and shearing operation.

That is, a steel mold with a rectangular frame shape in cross section into which the blade base of the rotary harrow can be fitted is cut to a desired length, the cut steel mold is placed on a main die, and the medium dies are inserted from both ends so as to face each other in the center. An arc-shaped notch extending to both ends in the width direction is formed on the opposing surface of this rain die, and the center of the cutting steel is sheared and divided into two parts using a punch having a cutting edge shape corresponding to the arc-shaped 5J notch. A bolt/nut insertion hole is formed in the split type steel to manufacture a harrow blade attachment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings showing embodiments thereof.

First, commercially available long cross-sectional rectangular shaped steel can be used as the length of the metal fitting A, for example as shown in FIG. That is, holes 12 and 12' into which the shaped steel 11 can be inserted are formed in the left and right dies 10°10', and the holes 1
2, form a blade on the opening edge of the die 10', set the depth and left and right length (t) of one hole 12 to twice the length of the metal fitting A, and set the other hole 12' on the left and right sides of the die 10'. Both FL12.12'+
This can be inserted freely.

One hole 12 has a hole 13 communicating with it from the left side of the die 10.
The left and right dies 1 are formed by inserting medium dies 14 and 14' each having a square cross section through the holes 13 and 12', respectively.
0 and 10' contact surfaces.

In this state, if one of the dies 10 and 10' is fixed and the other is pushed down, the steel mold 11 will be sheared along the contact surface of both dies 10 and 10', and the length will be twice as long as the metal fitting A. The model steel 15 is asked. In this case, ``the moving die is divided into upper and lower parts with the hole 12 or 12' as the boundary, and after the upper and lower divided dies sandwich the steel mold 11 to form a shear line, the divided dies are lowered. , shearing is performed even more smoothly.

At the same time, the shaped steel 15 is made into a mounting bracket A having the shape shown in FIG. 5 by shearing work shown in FIGS. 3 and 4. That is, as shown in the figure, the mold 6a15 is fitted into the lower mold 16 which becomes the main die, and the middle dies 17 and 17 are inserted from both ends of the mold steel 15 so as to face each other at the center. As shown in FIGS. 3 and 4, an arcuate 17J notch 18 is formed on the surface, extending to both ends in the width direction and matching the outer circumferential curvature of the rotating shaft 1 shown in FIG. When the upper mold 24 is lowered in the state shown in FIG.
An arcuate 5J notch 3 is formed by contacting the hole 415 and divided into two, and a bolt hole 6 is formed by the punch 20. After that, the upper mold 24 is raised, the divided steel mold 22 is pushed up with the push-up rod 21 and removed from the lower mold 16, and the hole 23 corresponding to the bolt hole 6 is cut into the hole 6 by another process such as die cutting. The bolt is formed on the opposite wall of the wall so that a bolt can be inserted therethrough, thereby obtaining the desired mounting bracket A shown in FIG.

This metal fitting A is welded to the rotary shaft 1 of the rotary harrow in the same manner as the conventional one described above, and the blade 2 is attached. The positioning protrusion 7 may also be provided in the notch 3 of the metal fitting manufactured in this way as in the conventional one, and in that case, the shape of the cutting edge of the punch 19 and the shape of the notch 18 of the medium die 17 and 17 will also be changed accordingly. I will make you respond.

As described above, according to the manufacturing method of the present invention, a molded steel having a rectangular frame shape in cross section into which the blade base of a revolving harrow can be fitted is cut to a desired length (v), and the lino-cut molded steel is placed on the main die. A medium die is inserted from both ends so as to face each other at the center, and an arcuate notch extending to both ends in the width direction is formed on the opposing surface of the rain die, and a punch having a cutting edge shape corresponding to the arcuate notch is used to By shearing the center of the 9-section type steel and dividing it into two parts, and forming bolt/nut insertion holes in the split type steel, it is possible to obtain a large amount of mounting hardware at low cost without requiring work such as welding as in the past. I can do it.

[Brief explanation of the drawing]

Figure 1 is a partial perspective view of the row recessed harrow, Figures 2 to 4
The figure is a process explanatory diagram of this manufacturing method. Figure 2 is a cross-sectional diagram for explaining cutting of the steel mold before it is divided into two. Figure 3 is a cross-sectional diagram of a sheared part for explaining shearing of the mounting bracket. Figure 4 is Figure 3. Nosen Fshi1
The latter is a plan view, FIG. 5 is a perspective view of a mounting bracket manufactured according to the present invention, and FIG. 6 is a perspective view of a conventional mounting bracket. 1... Rotating shaft, 2... Blade, 3... Notch, 6...
Bolt hole, 11, 15.22... type steel, 16.
...Lower die, 17...Medium die, 18...Notch, 19
．． 20... punch, 24... upper mold. Patent applicant: VIV Engineering Co., Ltd. Agent: Ken U.
-Figure 2Figure 3 24 Figure 4

Claims (1)

[Claims] Cut a steel mold with a rectangular frame shape into a desired length into which the blade base of the Rokuri harrow can be inserted, place the cut steel on the main die, and insert medium dies from both ends so that they face each other in the center. An arcuate notch extending to both ends in the width direction is formed on the facing surface of the die, and the center of the cut steel is analyzed and divided into two parts using a punch having a cutting edge shape corresponding to the arcuate cutout. This is a rotary harrow blade characterized by forming a bolt/nut insertion hole in the hole. Production method.