JP4640982B2 - Deburring device - Google Patents

Description

The present invention relates to a deburring device for a cast product obtained by die-casting an aluminum alloy.

When a cast product is formed by taking a large number of pieces, the runner is folded and removed with a punch. In this case, if the workpiece is punched too close to the workpiece, the workpiece may be cracked. Therefore, the punch will be punched at a position away from the workpiece to some extent. Since the remaining burr of the shape is formed, it is necessary to perform a finishing process to reduce the surface roughness by manually cutting the burr with a router or the like.
An apparatus for deburring according to a curved surface of a workpiece surface while lowering a cutting blade is known.
Japanese Patent Laid-Open No. 10-362320

  In the manual finishing, the production efficiency is low, and the surface roughness after finishing tends to vary greatly. Therefore, there is a demand for a deburring device that can achieve high production efficiency and constant finishing quality. In addition, the deburring apparatus of the above-mentioned patent document 1 performs only a finishing process for reducing the surface roughness, and cannot remove a large burr. Therefore, the present invention aims to realize the above request.

In order to solve the above problems, the invention of claim 1 according to the deburring device of the present application comprises a punch for deburring and a broach interlocked with the punch,
This broach is arranged so that the blade portion is close to the workpiece made of cast product,
This blade portion is formed by a plurality of blades, and the blade provided on the tip side of each blade is a tip blade, and a separate bumper blade is attached to the tip side of this tip blade,
Against burrs balance remaining on the workpiece side when the burr was Tsu folding by the punch, the bumper edge is finishing by cutting by the broach while removing by folding a protruding portion of the burr balance before the tip blade In a deburring device for deburring cast products,
The blade part of the broach is tapered so that the tip side escapes from the workpiece,
The amount of protrusion of each blade formed on the blade portion toward the workpiece changes so as to gradually move away from the workpiece toward the tip blade side,
In addition, each blade is inclined with respect to the workpiece,
The tip portion of the blade portion is horizontal, and the bumper blade is attached to the horizontal portion,
The bumper blade is set so as to have a protruding amount less than or equal to the tip blade .

According to the first aspect of the present invention, the burr is removed from the workpiece by punching the burr away from the workpiece and folding the burr. At this time, cracking of the workpiece can be prevented. Simultaneously with the removal of burrs by this punch, the remaining burrs remaining on the workpiece surface are cut and finished by a broach. Therefore, deburring by punching so as not to damage the workpiece and finishing by broaching can be realized at the same time.
For this reason, the production efficiency can be increased, and the surface roughness after finishing can be made constant to stabilize the quality.

In addition, since a separate bumper blade was attached to the tip blade of the broach, the bumper blade first contacted the remaining burr at the time of broaching, and the part with a large cutting resistance was folded, and then the cutting resistance was further reduced. Since the broach cuts the portion, the blade of the broach can be protected and the life can be extended.

  An embodiment will be described below with reference to the drawings. This embodiment relates to a cast product immediately after die-casting an aluminum alloy material, and FIG. 1 is a plan view showing a state in which the cast product 1 is set and positioned and fixed to a lower part of a deburring device to be described later. .

The cast product 1 is obtained by casting two workpieces 2 and 2 so as to be cast at a time. The workpiece 2 serves as a connecting rod of the engine, and is a known one in which the small end portion 3, the arm portion 4, and the large end portion 5 are integrated. The small end 3 and the large end 5 are provided with holes 6 and 7, respectively.
In the following description, the small end 3 side is the front and the large end 5 side is the rear with respect to the cast 1 or the work 2.

  The workpieces 2 and 2 are paired on the left and right with the center line C in between, and the small ends 3 and 3 of the workpieces 2 and 2 are connected by a runner 8 which is a bridge-shaped burr, and the left and right large ends. The parts 5 and 5 are also connected by an overflow 9 which is a bridge-like burr, and the left and right workpieces 2 and 2 are integrated in the casting 1.

  Reference numeral 8a in the runway 8 is a bridge portion, and 8b is a gate portion. The bridge portion 8a extends to the left and right and is connected to the side surfaces 30 of the small end portions 3 and 3, and an intermediate portion on the center line C is a first punch point P1. Similarly, the overflow 9 includes a bridge portion 9a that connects the rear end portions of the left and right large end portions 5 and 5, and an intermediate portion on the center line C is a second punch point P2.

  The runner 8 and the overflow 9 are burrs that are removed from the workpieces 2 and 2 by a punch described later. Further, the first punch point P1 and the second punch point P2 are set farthest away from the workpieces 2 and 2 so that the workpieces 2 and 2 are not cracked by an impact during punching.

The cast product 1 is subjected to removal of the runner 8 and overflow 9 and finishing of the removed portion by a deburring device 10.
FIG. 2 shows the entire configuration of the deburring device 10 immediately after deburring. The deburring device 10 has a rectangular base portion 11 in plan view, and a stroke guide having a telescopic column shape standing at four corners thereof. 12 and a ceiling portion 13 supported between the upper portions of the stroke guides 12. The ceiling portion 13 can be moved up and down by the stroke guides 12.

  A lower receiving portion 14 is supported on the base 11, and the casting 1 is fixed thereon. An upper plate 15 is supported on the ceiling portion 13, and a first punch 16, a second punch 17 and a broach 18 are provided on the upper plate 15 so as to protrude downward. The broach 18 is attached and fixed to the upper plate 15 via a connecting member 18a. The first punch 16 and the second punch 17 fold the runner 8 and the overflow 9, respectively, and the broach 18 performs a finishing process on a burr remaining portion described later. A pressing pin 19 is provided at an intermediate portion between the first punch 16 and the second punch 17 and is urged downward by a spring 24 to fix the intermediate portion in the front-rear direction of the casting 1 from above.

  A first positioning pin 20 is erected on the lower receiving portion 14 to position the front side of the casting 1. A second positioning pin 21 is erected on the rear side of the first positioning pin 20 to position the rear side of the casting 1. The second positioning pin 21 is supported on the slide rail 22 on the lower receiving portion 14 and is moved in the front-rear direction by the lock cylinder 23 to lock the second positioning pin 21 in the retracted position.

  FIG. 3 shows the base 11 from above. The lower receiving portion 14 is arranged in a pair of left and right according to the left and right workpieces 2 and 2, and the first positioning pins 20 are also provided in a pair of left and right. A pair of left and right positioning pins 21 and a lock cylinder 23 are also provided. However, the moving direction of the second positioning pins 21 and 21 is inclined with respect to the center line and is along the axis of the workpieces 2 and 2 (see FIG. 6). The expansion / contraction direction of the lock cylinders 23, 23 is along this axis.

  The first positioning pin 20 positions the small end 3 by fitting the tip into the hole 6 of the small end 3. The second positioning pin 21 positions the large end 5 by fitting the tip into the hole 7 of the large end 5. At this time, when the second positioning pin 21 is moved rearward by the lock cylinder 23, the large end portion 5 is positioned and this state is locked.

FIG. 4 is a view showing the upper plate 15 side from below. On the center line C, the first punch 16 is positioned on the first punch point P 1 of the runner 8, and the second punch 17 is positioned on the second punch point P 2 of the overflow 9. Broaches 18 and 18 are provided on the left and right in the vicinity of the first punch 16. The broach 18 is disposed so that the blade portion is close to the side surface portion 30 of the small end portion 3.

  On the middle part of the left and right arm parts 4, presser pins 19, 19 are provided symmetrically. Each pressing pin 19 is projected and biased downward by a spring 24 (FIG. 2), and prior to the deburring process, the arm portions 4 and 4 are pressed from above to be positioned and fixed.

  FIG. 5 is an enlarged view of a portion of the broach 18. The broach 18 includes a blade portion 31 that faces the side surface portion 30, and is detachably attached to a support portion 32 that is attached to the upper plate 15. . The blade portion 31 is tapered so that the lower side escapes from the side surface portion 30.

  FIG. 6 is a view showing a cutting surface (a surface facing the side surface 30) of the blade portion 31, and the blade portion 31 is formed with a plurality of blades 33 inclined in parallel. 33a is a tip blade. The lower end of the blade portion 31 below the tip blade 33a is horizontal, and a bumper blade 34 is detachably attached to the horizontal portion from below with a bolt 35. The bumper blade 34 has a simple rectangular parallelepiped block shape.

FIG. 7 is a view showing the blade portion 31 from a direction perpendicular to FIG. 6, and the amount of protrusion of each blade 33 gradually decreases away from the side surface portion 30 from top to bottom. The bumper blade 34 is set so as to have a protrusion amount less than or equal to that of the tip blade 33a. When the blade portion 31 is lowered, the bumper blade 34 first contacts the protruding side of the burr remaining portion 36 protruding from the side surface portion 30, and the burr remaining portion. A portion 36a having a large cutting resistance is folded at most of the tip side of 36 to protect the tip blade 33a. 36b is a remaining portion in the deaf et at removal by the bumper edge 34 of the burr balance 36.

  Next, the operation of this embodiment will be described. First, as shown in FIGS. 1 and 3, the casting 1 is set on the lower receiving portion 14. At this time, the holes 6 and 6 of the small end portions 3 and 3 in the left and right workpieces 2 and 2 are fitted to the tips of the first positioning pins 20 and 20 to position the small end portions 3 and 3 side.

  The holes 6 and 6 of the large end portions 5 and 5 are also fitted to the tips of the second positioning pins 21 and 21, and the second positioning pins 21 and 21 are pulled rearward by the lock cylinders 23 and 23 to , 5 is accurately positioned and locked.

  Subsequently, as shown in FIG. 2, the upper plate 15 is lowered, and the arm portions 4 and 4 are first pressed by the pressing pins 24 and 24 for positioning. Subsequently, the first punch point P1 and the second punch point P2 of the runner 8 and the overflow 9 are punched from above by the first punch 16 and the second punch 17, and the runner 8 and the overflow 9 are moved to the small end portions 3 and 3. And fold off from the large end portions 5 and 5.

  Subsequently, most of the burrs 36 remaining on the side surfaces 30 and 30 of the small ends 3 and 3 are folded and removed by the bumper blades 34 and 34 of the broach 18 and 18 from the protruding end side. Thereafter, the remaining portion of the burr remaining portion 36 is cut while the blade 33 approaches the side surface portion 30 in order from the tip blade 33a, and finally the surface of the side surface portion 30 is finished to have a certain surface roughness.

  In this way, the first punch point P1 and the second punch point P2 are located farthest from the small end 3 and the large end 5 with respect to the runner 8 and the overflow 9 which are burrs of the work 2. Since the burr is broken by punching, the cracks at the small end portion 3 and the large end portion 5 of the work 2 can be prevented.

  At this time, simultaneously with the removal of the burr by the punch, the burr remaining portion 36 remaining on the side surface 30 of the small end portion 3 of the work 2 is cut and finished by the broach. Therefore, deburring for punching so as not to damage the workpiece 2 and finishing by the broach 18 can be realized at the same time. For this reason, the production efficiency can be increased, and the surface roughness after finishing can be made constant and the quality can be stabilized.

  Moreover, since a separate bumper blade 34 is attached to the blade portion 31 of the broach 18 below the tip blade 33a, the bumper blade 34 first contacts the burr remaining portion 36 during the broaching process, and the cutting resistance from the protruding end side. Then, the blade 33 of the broach 18 cuts the remaining portion 36b having a lower cutting resistance, so that the blade 33 of the broach 18 can be protected and the life can be extended.

In addition, providing the broach 18 also on the large end portions 5 and 5 side can be arbitrarily performed as necessary. Moreover, it can apply also to castings other than aluminum die-casting, and the burr | flash used as the removal object is not restricted to a hot water channel. Also, it can be applied to either single piece or multiple pieces of two or more pieces.

Top view of the casting Overall view of deburring device Plan view of the lower receiving part View showing the upper plate from below Enlarged view of broach part The figure which shows the blade part of the brooch Same view as above

Explanation of symbols

  1: cast product, 2: workpiece, 3: small end, 4: arm, 5: large end, 6: hole, 7: hole, 10: deburring device, 11: base, 12: stroke guide, 13 : Ceiling part, 14: Lower receiving part, 15: Upper plate, 16: First punch, 17: Second punch, 18: Broach

Claims (1)

Comprising a punch (16) for taking burrs, and brooches interlocked with the punch (18),
The broach (18) is arranged so that the blade (31) is close to the workpiece (2) made of the cast product (1),
The blade part (31) is formed by a plurality of blades (33), and the blade provided on the tip side of each blade (33) is a tip blade (33a).
A separate bumper blade (34) is attached to the tip side of the tip blade (33a),
Against burrs balance remaining on the workpiece side when the burr was Tsu folding by a punch (16) (36),
The burrs of the cast product in which the bumper blade (34) cuts and finishes with the broach (18) while removing the protrusion side (36a) of the burr remaining portion (36) before the tip blade (33a) is removed. In the deburring device for removing
The blade part (31) of the broach (18) is tapered so that the tip side escapes from the workpiece,
The amount of protrusion of each blade (33) formed on the blade portion (31) toward the workpiece (2) changes gradually away from the workpiece toward the tip blade (33a) side,
Furthermore, each blade (33) is inclined with respect to the workpiece (2),
The tip part of the blade part (31) is horizontal, and the bumper blade (34) is attached to the horizontal part,
The deburring device is characterized in that the bumper blade (34) is set so as to have a protrusion amount less than or equal to the tip blade (33a) .

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