JPS61288912A - Cutting method removing burr in milling - Google Patents

Abstract

PURPOSE:To enable the method to remove a burr generated in the feed direction side of a work by feeding a milling cutter in a small distance to a side of the work while retracting the cutter to be moved in a small distance in a reverse direction to the feed direction after the milling cutter finishes cutting. CONSTITUTION:When a work 5a is cut by a milling cutter 1, the cutter 1 is rotated in the direction of an arrow head, and if the cutter, after it gives a predetermined depth of cut, is fed in the direction of an arrow head in the drawing, the work provides burrs W', W'' to be left at a point of time finishing cutting. Here the method, after feeding the cutter 1 in a small distance into the cutting direction while retracting the cutter 1 to be moved in a small distance in a reverse direction to the feed direction of an arrow head in the drawing, lifts the cutter 1 to the height of the original point to be moved in an opposite direction to the arrow head and returned to the original point. As the result, the method generates a surface 5c, having a stepped difference of small depth in the point end part of a cut surface 5a', while removes the burr W'. Accordingly, it is only required for the method to remove the burr W'' in one direction by a tool 2 after milling is finished, and labor hours can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention is directed to
'& It relates to a new deburring processing method that reduces deburring.

"Prior Art and Problems" It is known that when Z-milling a workpiece made of hard materials such as high carbon steel or chrome/molybdenum steel, a large amount of strong burrs are generated on the edge of the workpiece in the feed direction and rotation direction of the milling cutter. There are n. To illustrate this situation, as shown in Fig. 5, the milling cutter 1 is rotated clockwise and lowered by a predetermined amount from one origin α so that the depth of cut is made against the workpiece WG, and then from the point b to zero. Milling cutter 1 to point
By cutting feed the upper surface W of the workpiece W as shown in Fig. 6,
As cL is cut, strong burrs are generated on the edges of the workpiece in the feed direction and rotation direction of the milling cutter 1, as shown by w' and w'. (Note that the milling cutter 1 is raised from point 0 to point f' and returned to the origin α.) As described above, burrs w' and w are generated in two directions on the workpiece W.
' must be removed separately, for example with a deburring tool 2-3.

Therefore, a deburring process after milling and mechanical equipment for this process are required, which is a bottleneck in machining workpieces made of sticky and hard materials.

A typical example of a workpiece using the above-mentioned high carbon M1 chromium molybdenum steel is a connecting e-rod for an automobile engine. This connecting rod
11! As shown in J (a), in order to balance the weight at both ends, the weight protrusions 5α, 5b provided at both ends of the connecting rift 150 are inserted into the tips 1α, 1j, etc. of the milling cutters 1, 1'. Cut into small portions. Conventionally, the milling cutter cuts the weight protrusions 5α and 5b, which serve as workpieces, in one direction with a predetermined depth of cut by the method shown in Fig. 5.6.
Burrs similar to w' and w' are generated on two sides of the protruding edge on the feed direction and rotation direction sides of the milling cutter 1.1'.

This deburring work must also be carried out using two deburring tools 2 and 3 as shown in FIG. The head of ... is deburring tool 2,
There is also the problem of interference with 3.

``Means and operations for solving the problem'' The present invention has been made in view of the above-mentioned density point and efficiency of deburring work. This is a processing method in which burrs generated on the side of the workpiece in the feed direction are cut and removed by feeding the workpiece a small amount to the side to give a depth of cut, and at least moving the milling cutter a small amount backward in the opposite direction to the feed direction. This makes it possible to reduce burrs that occur in two directions on the workpiece using a milling cutter in only one direction.

"Example" Hereinafter, the burr removal processing method for milling processing of the present invention will be explained using embodiment examples shown in the drawings. In the process of correcting the weight balance of the connecting rod 5 shown in FIG.
Large diameter face milling) 1゜1' large number of chips 1α・-
The cutting process is performed using yu, 1a'・oo. The milling cutters 1 and 1' mentioned above have a weight protrusion 5 which becomes a workpiece.
α, 5b approaches the connecting rod 5 side so as to have a predetermined depth of cut, and feeds the cutting while being rotated. Milling cutter 1 in the present invention
The feed trajectory is shown in FIG. 1 at the rightmost tip lα that first contacts the workpiece. That is, when the tip 1α of the cutter 1 at the origin α moves toward the weight protrusion 5α side to point b, it becomes a predetermined depth of cut Hh, and the cutter 1 is moved from there to point C at a predetermined cutting speed ( (feeding direction), it moves outward from the protrusion 5α to the right.

When the tip 1α of the cutter 1 is moved by a small amount to point C or point d, a small amount of cut 1 is given from the new cutting surface 5α'. This is a machining cycle diagram in which the chip is moved back a little in the opposite direction, then separated from the chip to point f, and returned to the initial origin α. This machining cycle diagram is the same for the milling cutter 1' at the small diameter end of the rod 5, and its cutting depth kh,n1 is determined by computer processing in advance of the corrected view of the weight balance at both ends of the connecting rod 50n. .

Next, the processing status of the weight protrusion 5a by the burr removal method of the milling process of the present invention will be explained. Milling cutter 1 (1') which rotates in a clockwise direction.This milling cutter 1, 1' has a predetermined weight protrusion 5α.

In contrast to 5b, the solid lines in FIGS.

If the milling cutter is fed from here to point 1.1'ZC at the cutting feed rate (dotted chain line in Figure 2), the protrusion 5α (
5b (not shown) is machined, and two edges 5 (Zt51Z') of the weight protrusion 5a, which are on the rotational and feeding direction sides of the milling cutter, are each cut with a bar IJW' as shown in FIG. , W' are generated. When the tips 1α of the milling cutters 1, 1' are at point C (the opening in FIG. Since there is a gap of After that, when the milling cutter 1 is moved backward in the opposite direction to the feed direction during cutting and the tip 1α on the tip side is moved by a small amount from point d to point e, the feed will be as shown in Fig. 3 (b). Burr W generated on the protrusion edge 5α' on the direction side
' is removed by cutting nl, and the lower surface 5c of the cut Ml, ht is formed in this part.

The relative positions of the protrusions 5α and 5b are indicated by two-dot chain lines in FIGS. 2(b) and 2(c). Then, the milling cutters 1, 1' return from the above-mentioned position (6 points) to the origin a via point f.
, ends the machining cycle.

Thereafter, the burr IJW' generated on the protrusion edge 5α1 is removed by the deburring tool 2, and since this deburring work is only done on one side, a simple deburring work is sufficient.

Here, the process of correcting the weight balance of the connecting rod mentioned above will be briefly explained with reference to the chart 70 in FIG. First, after loading the workpiece (rod 5), the weight and length of the workpiece are measured and the workpiece correction amount for the weight protrusions 5α and 5b is calculated.
A cutting depth of 1', hl, is set. After this, cutting and deburring work is performed to correct the workpiece length,
Measure the weight balance. Here, workpieces with insufficient length are rejected as completely defective products, while workpieces with unbalanced weight are fed back to the calculation of the workpiece correction amount, where the necessary workpiece corrections are again calculated. The depth of cut is set, and the workpieces that have been measured and found to be good after cutting are unloaded.

Note that the deburring processing method of the present invention is not limited to the above-mentioned embodiment, and can be applied to any workpiece in which a lower surface 5c may be formed on the cutting end surface 5α'. Alternatively, the feed of the milling cutter may be stopped and the cutting feed may be applied by moving the workpiece.

"Effects" As described above, when using the burr removal method of milling according to the present invention, after the milling cutter finishes machining, the milling cutter is fed a small amount to the workpiece side to give a depth of cut.
At least the milling cutter is moved backward a small amount in the opposite direction to the feed direction, and the damage caused in the feed direction of the workpiece is IJ'.
& Cutting is eliminated, so it is possible to use a milling cutter during milling to reduce the burr 'J' that occurs on both sides of the workpiece & only one side, and the deburring work can be done only on one side. It is expected that there will be effects such as no need for an expensive deburring machine and a simple deburring process will be sufficient.

[Brief explanation of drawings]

Fig. 1 is a locus diagram of the cutter feed and a sectional view of the workpiece according to the method of the present invention, and Fig. 2 is a side view showing the relationship between the milling cutter and the connecting rod for processing both ends of the connecting rod using the method of the present invention. Movement diagram, Figure 3 is a workpiece end view showing the occurrence and removal of burrs, Figure 4 is a 70-chart diagram of the cutting rod weight balance correction TE machining method, and Figure 5 is a diagram showing the milling cutter relative to the workpiece. FIG. 6 is a cutter feed locus diagram and a cross-sectional view of a workpiece showing the conventional cutting method, and FIG. 6 is an end view of the workpiece showing the state of burrs generated by the conventional cutting method of a milling cutter. 1.1... Milling cutter, 1α, 11... Tip, 2.3-... Deburring tool, 511... Connecting rod, W-... Workpiece, W', w'...
Burr, 5a, 5b... Weight protrusion, 5a'...
Cutting surface (end surface), 5a', 5α1・Q, weight protrusion edge, 5c...low surface, α~f...cutter feed locus, A
, A work ... depth of cut. 12 Group (a) (b) Paddle
6 Old Ta 4 Group

Claims (1)

[Claims] After milling cutters 1 and 1' finish processing the workpiece W, feed these milling cutters 1 and 1' a small amount toward the workpiece side to give a depth of cut h_1, and at least move the milling cutters 1 and 1' a small amount in the opposite direction to the feeding direction. A burr removal method for milling processing, which is characterized in that burrs W' and W'' generated on the feed direction side of a workpiece W are removed by moving backward.