JPH0432171Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a trimming device.
The present invention relates to a trimming device used to remove burrs generated on the surface of a workpiece during casting.

[Conventional technology]

For example, hollow crankshafts for automobile engines are typically cast using molds made of sand. Figure 2 shows a hollow crankshaft cast by pouring molten metal into a sand mold.
to fourth crank pins 3a, 3b, 3c, 3d
and an arm 4, and balance weights 5a and 5b are integrally provided on the opposite side of the crank pins 3a to 3d to prevent vibration. During casting of the hollow crankshaft 1, cast burrs are generated on the horizontal parting surface of the crankshaft 1, but these cast burrs are removed by a trimming tool equipped with a deburring jig that reciprocates linearly in the vertical direction. Deburring was done using equipment or a chisel manually by the worker.

By the way, when a core 6 is used as shown in FIG. 3 in the casting process of the hollow crankshaft 1,
Cast burrs 7 are not only generated on the casting horizontal parting surfaces on the outside of the crank pins 3a to 3d, but also casting burrs 8 are generated at positions vertically shifted from the casting horizontal parting surfaces on the inside of the counterweights 5a and 5b.
a, 8b occur.

[The problem that the idea aims to solve]

In the conventional trimming device described above, since the deburring jig moves in the vertical direction, the crank pins 3a to
Cast burrs 7 generated on the casting horizontal parting surface in 3d can be removed with the above-mentioned deburring jig, but cast burrs 8 generated on parts other than the casting horizontal parting surface can be removed.
It was not possible to remove a and 8b. Also,
When an operator manually removes burrs, the cast burrs 8a and 8b occur in the narrow gap between the arms 4, making it difficult to insert a chisel into the gap, and even if it were possible to do so, it would be difficult to insert the chisel into the gap. There is a risk of damage to the glasses.
Moreover, since there are many places to deburr, deburring takes time, requires a great deal of labor and effort, and has the problem of extremely poor workability.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a trimming device capable of deburring cast burrs generated at a portion vertically shifted from a horizontal casting surface of a crankshaft.

[Means to solve the problem]

The present invention was proposed to achieve the above object, and consists of a mounting base disposed to be capable of linear reciprocating movement in an oblique direction, and a pair of cutting tools installed opposite to each other on the front surface of the mounting base. Each cutter includes a cutter body whose outer surface is shaped like a step down toward the tip and has a plurality of mounting steps, and a cutting blade that is replaceably attached and fixed to the mounting portion of the cutter body. It is something.

[Effect]

By linearly reciprocating the pair of cutters in an oblique direction and appropriately changing the movement stroke, it is possible to reliably remove cast burrs generated on surfaces other than the casting parting surfaces of a plurality of types of crankshafts.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1. Furthermore, Figures 2 and 3
Components that are the same as those shown in the figures are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, 11 is a base on which the hollow crankshaft 1 is placed, and 12 is a positioning member having a positioning groove 13 with a V-shaped cross section into which the crank journal 2 is fitted. To surely prevent movement of a crankshaft 1 in the width direction. 14 is a plurality of pairs of pressing arms 15
a, 15b, and the crankshaft 1 placed on the base 11 is clamped by the pressing arms 15a, 15b of the clamping means 14.
The crankshaft 1 is clamped onto the base 11 by pressing the counterweights 5a and 5b. 1
Reference numerals 6 and 16' designate a pair of first and second flashing burrs 8a, 8b, 8a', and 8b' that are generated at positions vertically shifted from the casting horizontal parting surfaces of the crank pins 3a to 3d. This jig 16,1
6' is located at a symmetrical position diagonally above both sides of the base 11,
The crankshaft 1 placed on the base 11 is installed so as to be able to move in parallel, and is intermittently stopped at a position to the side of each crank pin 3a to 3d of the crankshaft 1. Something,
At each stop position, the actuator, e.g.
It is configured to linearly reciprocate inward and diagonally downward (in the direction of inclination of the jig) by a hydraulic cylinder. Each of the above-mentioned jigs 16, 16' consists of a flat mounting base 17, 17' and a front surface 1 of the mounting base 17, 17'.
A pair of long cutting tools 18, 18' and short cutting tools 19, 1 of different lengths are provided parallel to each other in parallel to 7a, 17a'.
9'. The above jig 16,1
6' each long cutting tool 18, 18' and short cutting tool 1
9, 19' are outer surfaces 20, 20', 21, 21'
A plurality of first to third mounting step portions 22a, 22b,
22c, 22a', 22b', 22c' and 23a,
Cutting tool bodies 24, 24', 25, 25' provided with 23b, 23c, 23a', 23b', 23c', and each mounting stepped portion 22a of the cutting tool main bodies 24, 24', 25, 25'.
Cutting blades 26a, 26b, 26c, 26 replaceably attached and fixed to ~22c' and 23a~23c'
a', 26b', 26c' and 27a, 27b, 27
c, 27a', 27b', 27c',
The mounting positions of the cutting blades 26a to 26c' and 27a to 27c' of the long cutting tools 24, 24' and the short cutting tools 25, 25' are shifted by a predetermined distance in the moving direction of the jigs 16, 16'.

Next, the deburring procedure using the device of the present invention will be explained as follows.

Place the crankshaft 1 on the base 11, fit the crank journal 2 into the positioning groove 13 of the positioning member 12, and position the crankshaft 1 in the width direction and in the longitudinal direction by appropriate means. do. After that, the clamping means 14 is operated to push the counterweights 5a, 5b of the crankshaft 1 into the pressing arms 15a, 15b.
to clamp the crankshaft 1.
When the crankshaft 1 is placed and held on the base 11 in this way, in the first and second jigs 16 and 16' located on the sides of the first crank pin 3a,
The first jig 16 moves forward, and the second jig 19 of the short cutter 19 moves forward.
The upper cast burr 8a generated on the outer peripheral surface of the crank pin 3a is removed by the cutting blade 27b. When the upper casting burr 8a is removed, the first jig 16 retreats and returns to its original position, and at the same time, the second jig 16' moves forward and the second cutting blade of the long cutting tool 18 The lower cast burr 8b of the crank pin 3a is removed by 26b'. When the lower casting burr 8h is removed, the second jig 16' retreats and returns to its original position. When the cast burrs 8a and 8b on the upper and lower parts of the crank pin 3a are removed in this way, the first and second
The jigs 16, 16' move parallel to the crankshaft 1 and stop at positions lateral to the crank pin 3b. At this stop position, the first
The jig 16 moves forward, and the second cutting blade 26b of the long cutting tool 18 removes the lower cast burr 8 of the crank pin 3b.
When b' is removed, the first jig 16 is moved back. Simultaneously with the retreat of the first jig 16, the second jig 16' moves forward and uses the second cutting blade 27b' of the short cutter 19' to remove the upper cast burr 8 of the crank pin 3b.
a′ is excised. When the upper casting burr 8a' is removed, the second jig 16' retreats and returns to its original position. After that, the first and second jigs 1
6, 16' further move intermittently along the crankshaft 1, and at the intermittent stop positions, the upper and lower cast burrs 8a, 8b, 8a', 8b' generated on the crank pins 3c, 3d are removed in the above manner. be done.

The above crankshaft 1 differs in size depending on the car model, but in that case, the first and second jigs 1 are used.
The first or third cutting blade 2 of each jig 16, 16' is moved by changing the movement stroke of 6, 16' as appropriate.
6a, 26c, 26a', 26c' and 27a, 2
7c, 27a', 27c' cast flash 8a, 8b,
All you have to do is cut out 8a' and 8b'.

In the above embodiment, the case where cast burrs generated on the crankshaft of an automobile engine were removed was explained, but the present invention is not limited to this, and can be applied to the case where cast burrs generated on various workpieces are removed. Can be widely used.

[Effect of idea]

According to the present invention, for example, by using a core in the process of casting a hollow crankshaft, even if cast burrs are generated at a position vertically shifted from the horizontal parting surface of the crankshaft, the pair of cutting tools can be removed. By linearly reciprocating in an oblique direction, it is possible to reliably and quickly remove the flash that has occurred on crankshafts of various sizes. Therefore, the deburring work can be completed in a short time, and work efficiency can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory front view showing an embodiment of the device of the present invention. FIG. 2 is a partial explanatory view of the crankshaft, and FIG. 3 is a cross-sectional explanatory view showing a state in which casting burrs are generated on a casting horizontal parting surface of a crank pin of the crankshaft. 17, 17'...Mounting board, 17a, 17a'...
...front, 18, 19, 18', 19'...cutting tool, 2
0, 21, 20', 21'...outer surface, 22a-2
2c', 23a to 23c'...Mounting step, 24, 25
...Knife main body, 26a to 26c', 27a to 27
c′... Cutting blade.

Claims (1)

[Scope of utility model registration request] It consists of a mounting base that is arranged to be able to reciprocate in a straight line in an oblique direction, and a pair of cutting tools that are installed opposite to each other on the front surface of the mounting base, and each of the cutting tools is formed in a descending staircase shape with the outer surface facing toward the tip. A trimming device comprising: a cutting tool body provided with a plurality of mounting steps; and a cutting blade replaceably attached and fixed to the mounting steps of the cutting tool main body.