JPS6243772B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deburring device for removing burrs from a die-forged product, such as a hot-forged crankshaft material for an internal combustion engine.

Conventionally, in a die forged product after hot forging, for example, a crankshaft material 1 as shown in FIG.
During hot forging, in order to sufficiently fill the billet into the cavity of the split die to obtain the desired shape, the capacity of the billet is made larger than the capacity of the cavity, and the excess billet material is allowed to flow out from the gap between the split dies. The excess metal remains as a burr 6 on the periphery. Therefore, before cutting the pin part 28 and journal part 29 of the crankshaft material 1, the burrs 6 are preferably removed in a heated state.
It is necessary to remove it.

Figures 2 and 3 show such conventional deburring equipment, and Figure 2 is similar to that shown in Figure 1.
3 is a sectional view taken along the line, and FIG. 3 is a sectional view taken along the line -- in FIG. For deburring, the burr 6 is first clamped with upper and lower cutting dies 30 and 31 as shown in FIGS. 2 and 3 a,
Next, the burr 6 is removed by pressing only the upper inner die 32 or the upper and lower inner dies 32, 33 downward as shown in FIG. 3b to move the crankshaft material 1 downward. However, according to such a conventional device, due to some shape errors in the die-forged product, that is, the crankshaft material 1, which occurs due to differences in cooling rate, etc., the upper inner die 32 follows the lowering speed of the upper inner die 32, and
The lower inner dies 32 and 33 cannot be matched, and galling occurs between the outer surface of the crankshaft material 1 and the inner surfaces of the inner dies 32 and 33. Furthermore, since the impact is applied to the crankshaft material 1 from above, the impact is applied when the inner surfaces of the inner dies 32 and 33 and the outer surface of the crankshaft material are not in perfect contact with each other due to the above-mentioned shape error. Sometimes the crankshaft material 1
Shape deformations such as distortion and bending had occurred. In particular, the balance weight section 27 shown in FIGS. 2 and 3 is relatively thin and protrudes upward, so that it is susceptible to deformation such as bending or distortion due to impact from above.

In addition, as another conventional device, the crankshaft material 1 is placed on a lower mold having a cutting edge that follows the shape of the crankshaft, and the crankshaft material 1 is
There is also a device in which the burr 6 is removed by striking the burr from above, but this conventional device also has the same problems as the prior art described above.

The present invention has been made in view of such conventional circumstances, and after clamping a die-forged molded product closely to its surface, an incision is made at the burr cutting position, and the burr is further removed. It is an object of the present invention to provide a deburring device for a die forged product which prevents deformation of the die forged product.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIGS. 4 and 5, a die forged product to be deburred, such as a crankshaft material 1, is placed on a lower inner die 2, and an upper inner die 3 is placed on a lower inner die 2. and lower inner die 2,
Next, after the burr cutting position is held between the lower cutting blade die 4 and the upper cutting blade die 5, the burr 6 is cut off at the cutting position by moving both inner dies 2 and 3 downward.

The lower inner die 2 is formed by having a full-shaped recess 7 bored in the upper surface corresponding to one side surface of the crankshaft material 1, and having a side surface extending downward from the edge of the recess 7. It is fixedly installed on a base 8 in a fixed position via a lower support 9.

A lower cutting die 4 having an inner surface corresponding to the outer surface of the lower inner die 2 is disposed to surround the lower inner die 2 and to be movable up and down. A lower cutting blade 10 corresponding to the burr cutting position of the crankshaft material 1 is provided on the inner edge of the upper end of the lower cutting blade die 4 to protrude upward. For example, six impact buffering means 11 are disposed between the lower cutting die 4 and the base 8, passing through the lower support 9. The impact buffering means 11 performs a cushioning action using, for example, hydraulic pressure, and are arranged at intervals in the circumferential direction.

Guide holes 12 extending vertically are bored in the four corners of the lower cutting die 4, and four lower guide posts 13 erected on the lower support stand 9 are installed in these guide holes 12, respectively. It is inserted. Furthermore, an annular stopper 14 is fitted into the upper end of each guide hole 12.

A drive stand 15 is provided above the lower inner die 2 and the lower cutting edge die 4 and is driven vertically by, for example, a hydraulic system (not shown). A support tube 16 extending vertically is provided on the lower surface of the drive base 15.
The upper end of the support cylinder 16 is fixed, and an upper support base 18 having a hole 17 that can communicate with the inside of the support cylinder 16 is fixed to the lower end of the support cylinder 16 . Therefore, the upper support stand 18 is fixed to the drive stand 15 via the support tubes 16, and the support tubes 16 are arranged, for example, at four apex positions of a virtual rectangle.

A full-shaped recess 19 corresponding to the other side surface of the crankshaft material 1 is formed below the upper support base 18, and has an outer surface extending upward from the edge of the recess 19. The formed upper inner die 3 is disposed. This upper inner die 3 is suspended and supported by a drive base 15 via four spring means 20.

The resilient means 20 includes, for example, a guide rod 21 whose upper end is slidably fitted into the drive base 15 at a position corresponding to each support cylinder 16 and whose lower end is fixed to the upper inner die 3.
and a coiled spring 22 that surrounds the guide rod 21 within the support tube 16 and is interposed between the drive base 15 and the upper inner die 3. The spring 22 urges the upper inner die 3 in a direction away from the drive base 15, that is, the upper support base 18.

An upper cutting die 5 that surrounds the upper inner die 3 so as to allow relative vertical displacement therebetween is fixed to the upper support base 18 . Therefore, the upper cutting edge die 5 is
Drive base 1 via upper support base 18 and support tube 16
It is integrated into 5. Further, an upper cutting edge 23 corresponding to the lower cutting edge 10 of the lower cutting edge die 4 is provided on the inner edge of the lower end portion of the upper cutting edge die 5 to protrude downward.
Moreover, the upper cutting edge die 5 has an upper cutting edge 23 that protrudes below the lower surface of the upper inner die 3 when the crankshaft material 1 on the lower inner die 2 does not come into contact with the inner surface of the recess 19 in the upper inner die 3. The shape and dimensions can be determined so that it does not occur.

Insertion holes 24 are formed in the upper support base 18 at four positions corresponding to the lower guide posts 13, and cylindrical bushes 25 are respectively inserted into the upper cutting edge die 5 in correspondence with the insertion holes 24. It is fitted. Moreover, those insertion holes 24 and bushes 2
An upper guide post 26 hanging down from the lower surface of the drive base 15 is inserted through each of the upper guide posts 5 .

Next, the operation of this embodiment will be described. After hot forging, the crankshaft material 1 is placed on the lower inner die 2 with one side thereof fitted into the recess 7. At this time, the burr 6 is projected outward from the lower inner die 2, and the burr cutting position is located above the lower cutting edge 10 of the lower cutting edge die 4. In this state, when the drive stand 15 is driven downward by a hydraulic device (not shown), the recess 19 of the upper inner die 3 first comes into contact with the other side surface of the crankshaft material 1. Therefore, crankshaft material 1
is held between the lower inner die 2 and the upper inner die 3 from both sides. Moreover, since the firing means 20 is interposed between the upper inner die 3 and the drive base 15, even if there is some shape error in the crankshaft material 1, the crankshaft material 1 will be able to move upward on its entire surface. , lower inner die 2,3
It is securely held in the recesses 7 and 19.

Next, when the drive base 15 further descends, the upper inner die 3 is vertically displaced relative to the upper cutting die 5 while compressing the spring 22 of the springing means 20, and the upper cutting edge 23 of the upper cutting die 5 moves toward the crankshaft. It comes into contact with the burr cutting position of the material 1. Therefore, the burr cutting position is pinched between the lower cutting blade 10 and the upper cutting blade 23, and the temporary impact at that time causes cuts to be formed from both sides of the burr 6 at the burr cutting position. . Furthermore, the transmission of the temporary impact to the base 8 is suppressed by the impact buffering means 11.

Furthermore, as the drive base 15 descends until the lower end of the bush 25 comes into contact with the stopper 14,
The burr 6 is held between the double-edged dies 4 and 5 and bent, so that the burr 6 is cut away from the burr cutting position where the cut is made.

Moreover, during such cutting, even parts such as the balance weight part 27, which are relatively thin and protrude outward, have their entire surfaces cut into the recess 7 of the lower inner die 2 and the upper inner die 2, as shown in FIG. It is reliably supported on the inner surface of the recess 19 of No. 3, and therefore, it is possible to reliably prevent deformation such as bending or distortion in the balance weight portion 27 during cutting.

In the above embodiments, a deburring device for a crankshaft material of an internal combustion engine has been described, but it goes without saying that the present invention can be widely implemented as a deburring device for die forged products.

As described above, according to the present invention, after the die-forged molded product is clamped by the overall mold-shaped recesses of the upper and lower inner dies, a cut is made at the burr cutting position with the cutting blades of the upper and lower cutting bases, and Since the burrs are removed, the die-forged product is reliably clamped, and therefore no impact is directly applied to the die-forged product, causing deformation such as bending or distortion. Moreover, since a resilient means is interposed between the upper inner die and the drive stand, even if there is some dimensional error in the die-forged product, the mold alignment with the recesses of both inner dies is ensured. This eliminates the need for special work to modify the product shape, shortening the process. In addition, since the cut is made with both cutting blades and then bent to cut, only a small amount of pressure is required.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the crankshaft material as a die-forged product, Figs. 2 and 3 show conventional equipment, Fig. 2 is a sectional view of the part along the line - in Fig. 1, and Fig. 3 shows a conventional device. 3 is a sectional view taken along the line -- in FIG. 2 and shows the operating conditions. FIGS. 4 to 6 show an embodiment of the device of the present invention. FIG. The figure is a - line plan view of Figure 4,
The figure is a sectional view showing the operating state of the portion along the line - in FIG. 5. 1... Crankshaft material, 2... Lower inner die, 3... Upper inner die, 4... Lower cutting edge die, 5... Upper cutting edge die, 6... Burr, 7, 19... Recess, 8... Base, 9... Lower support stand , 10...lower cutting blade, 11...impact buffering means, 15...driving stand, 20...blasting means, 23...
Upper cutting blade.

Claims (1)

[Claims] 1. A lower inner die fixed on the base and having a general mold-shaped recess on the upper surface corresponding to one side surface of the die forged product; a lower cutting die having a lower cutting edge on the inner edge of the upper end along the burr cutting position of the product; a shock absorbing means interposed between the cutting die and the base; an upper part of the lower inner die and the lower cutting die; a drive base that is driven up and down by a drive base; an upper inner die disposed below the drive base and having a full-shaped recess on the lower surface corresponding to the other side of the molded product; a space between the inner die and the drive base; a resilient means interposed in the upper inner die; enclosing the upper inner die so as to enable relative displacement in the vertical direction; having an upper cutting edge corresponding to the lower cutting edge on the inner edge of the lower end; and an upper cutting blade die fixed to the drive base so that the upper cutting blade contacts the burr after contacting the forged molded product as it descends; Device.