JPH02100811A - Surface machining - Google Patents

Abstract

PURPOSE:To remove a raw part on the surface of a workpiece left by an edge back part of a ball end mill during its reciprocatory movement to improve surface roughness by cuttingly moving the ball end mill only in one direction with its rotation to make surface machining. CONSTITUTION:An end mill is cuttingly moved from a point alpha1 to a point beta1 in a direction G on the upper surface part 12 of a mold 11 simultaneously with its rotating. The end mill is next returned from the point beta1 to the point alpha1 without cutting work, and then moved by moving distance Q from the point alpha1 to a point alpha2 in a direction Z perpendicular to the direction G. Since the upper surface part 12 is machined only during the movement of the end mill in the direction G, it can be machined without a raw part left by an edge back part to improve its surface roughness.

Description

DETAILED DESCRIPTION OF THE INVENTION Nine Industrial Applications The present invention relates to a method for machining the surface of a member using a ball end mill.

<Prior Art> When processing the surfaces of various molds, the ball end mill is rotated and simultaneously moved back and forth.

FIG. 6 shows the movement of a ball end mill using a conventional surface processing method.

A ball end mill (not shown) is rotated at a rotation speed S and simultaneously moved in the direction F on the surface of the mold 1. Next, move the ball end mill by a movement amount P in the Y direction perpendicular to the F direction, move it in the f direction opposite to the F direction, move the ball end mill again in the Y direction, and repeat the movement. The surface of mold 1 is processed by selecting the F direction as appropriate depending on the surface shape of mold 1 and repeating reciprocating movement and movement in the Y direction.In addition, in areas with large inclination angles, in addition to feeding in the F (f) direction, Movement in the vertical direction of the ship is also combined.

<Problem to be solved by the invention> According to the conventional surface processing method, the ball end mill is moved in the F direction and in the Y direction each time the f direction is moved.
Cutting is performed during both forward and backward movement. For this reason,
As shown in FIG. 7, the back of the blade of the ball end mill remained during the reciprocating movement, and a remainder 2 remained on the surface of the mold 10. The height Δt of this remaining portion 2 is determined by the ratio of the S (rotation speed) to the feed speed in the F (f) direction being l:1, and the diameter of the ball end mill being φ10.
When the number of blades was two, Δt was a large value of 25μ.

This condition is more noticeable when cutting down than when cutting up, due to the relationship between the rotation of the ball end mill and the combination of feed in areas where the angle of inclination is large.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a surface processing method that does not leave any residue on the back of the blade on the surface.

Means for Solving the Problems> In the surface processing method of the present invention for achieving the above object, the surface is processed by rotating a ball end mill and moving it for cutting in only one direction.

Embodiment> FIG. 1 shows a movement path of a ball end mill in a surface processing method according to an embodiment of the present invention, and FIG.
FIG. 3 shows the moving path of the ball end mill at the side of the ball end mill.

At the same time as rotating the ball end mill (not shown), move the upper surface 12 of the mold 11 for cutting from point a1 to point β in the G direction (to the right from the force in FIG. 2). Next, without cutting, the ball end mill is returned from point β to point α, and is moved from point α to point α2 by a movement amount Q in the Z direction (downward in FIG. 2) perpendicular to the G direction.

Then, move the ball end mill for cutting in the G direction from point α2 to point β2, return the ball end mill from point β2 to point α2, and move it in two directions to point a with the amount of movement Q. Thereafter, the upper surface portion 12 is processed by cutting only when the ball end mill moves in the G direction.

At the same time as the ball end mill is rotated, the side part 13 of the mold 11 is moved on the contour line from the γ1 point, and the γ1
Move it to point 72 using the amount of movement Q. The ball end mill is again moved from point 72 to point 72 on the contour line, and this process is repeated to process the side portion 13. In addition, when machining the side part 13, as shown in FIG.
Processing may also be performed.

According to the double machining method, the ball end mill is moved in only one direction to process the upper surface 12 and side portion 13 of the mold 11, so the uncut portion on the back of the blade is removed. In addition to being able to cut only 7 pieces. According to experiments, the ratio of the number of turns of the ball end mill to the feed speed in the G direction is 1:1.
, When the diameter of the ball end mill is φ10 and the number of blades is two, Δt2 is about 10□ on the flat surface, and Δt2 is about 10 to 1 on the slope.
M was found to be 3μ (see Figure 5).

<Effects of the Invention> In the surface processing method of the present invention, the surface is processed by moving the ball end mill in only one direction, so it is possible to remove the uncut portion on the back of the blade,
It would be possible to cut only up-cuts. As a result, machining can be performed without leaving behind the blade on the surface, and the surface roughness is improved.

[Brief explanation of the drawing]

FIG. 1 is a movement path diagram of a ball end mill in a surface processing method according to an embodiment of the present invention, FIG. 2 is a movement path diagram of a ball end mill in its upper surface, and FIG. Fig. 4 is a movement path diagram of the side ball end mill of another embodiment, Fig. 5 is a sectional view of the mold after processing, and Fig. 6 is a ball end mill in the conventional surface processing method. FIG. 7 is a cross-sectional view of the mold after processing by the conventional method. In the drawings, 11 is the mold, 12 is the top part, 13 is the side part, and G is the direction of cutting movement. Figure L --J Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A surface machining method characterized by machining a surface by rotating a ball end mill and moving it in one direction only.