CS247296B1 - Cutting tool with replaceable plate - Google Patents

Abstract

The solution concerns a replaceable gray tool plate, placed in shape selected in the holder body that is its own associated with a drawbar positioned see the holder body, the nature of which lies in the fact that distances (hb h2, b3) the individual tips of the plate (2) from the center the pull pin (3) and the geometry of the individual spikes, e.g., radii of rounding of the spikes (rej, rs2, τε3) are spit. Tool handles solutions can be used mainly in automated production systems where needed often change tool geometry and position blade tip to workpiece.

Description

The invention relates to a cutting tool with a replaceable plate.

Previously known tool solutions with replaceable grinding wedges apply discs fixed in the tool holder, or gripping wafers which, after being fitted with a suitable mechanism, rotate to a new position, whereby the wedge is not worn. When using holders with a fixed plate using a clamping screw or clamp, the plate must be replaced manually. Another solution is to slide the cutting plate out of the bed and insert a new one. The entire knife holders that are supplied from the cartridges can also be replaced. They are transported from the magazine to the machining point by means of manipulators. These solutions are presently most prevalent in automated mechanical engineering, where the cutting tool must have sufficient operational reliability without operator presence. The cause that initiates the replacement of the cutting disc need not be merely its wear. Under conditions of automated low- and mid-series production, the type of workpiece and material to be machined is often changed. This change requires changing the geometry of the raw tool.

If the machining allowance is subdivided into roughing and smoothing, it is necessary to change the position of the tool tip relative to its central axis, thereby achieving a corresponding change in the machining allowance. In addition, it is often necessary to vary the radius of curvature or the profile of the knife tip.

These problems are solved by a cutting tool according to the invention, with a replaceable plate, located in a shaped recess in the holder body, which is connected through its opening to a rod disposed along the holder body, whose distances (hj, h ₂ , h ₃ J) the individual tips of the plate (2) from the center of the pivot pin (3) and the geometry of the individual tips, e.g. the radii of rounding of the tips (re _t , re ₂ , re ₃ J are spits).

The principle of the knife holder solution is shown in FIG. 1 and 2, wherein FIG. 1 is a plan view and FIG. 2 is a section along the line A-A.

A shaped groove is formed in the body 1, adapted to the plate shape. In the front part of the groove there is a cutting plate 2 whose individual spikes have different distances from the center of the chucking hole (hj # #h ₂ #h ₃ J.

The individual tips of the cutting plate 2 have different profiles, e.g. different radii of curvature (rej, re ₂ , re ₃ J.) The pin of the control rod 3 fits into the opening in the cutting plate 2. The cutting plate 2 is supported on a washer 4 which is fixed in the holder 1 by means of a pin, rivet or screw 5. The movement of the plate from the working position after it is worn, or when the machining mode is changed, is carried out by dragging the plate with a drawbar 3, by means of a drawbar pin inserted in the hole of the plate

Second

As the plate moves, the edge hits the wall of the groove of the body 1, thereby rotating it, in this case 90 °. The forward movement of the rod 3 allows further rotation of the size of the front angles) enables the machining of workpieces from different plate 2 in a technological sequence by touching the new tip against the groove wall and reaching the plate working position with the new plate tip in the working position. This cycle is repeated as necessary.

The tool according to the invention can be applied, in particular, in automated production systems which operate unattended and in which the geometry and position of the cutting tool need to be changed during machining. Ide -napr. roughing and subsequent surface polishing of the part where it is necessary to have different radii of radius of the tip in order to achieve the prescribed roughness of the machined surface during polishing. Since the distance of the individual tines from the center of the chucking hole is different, the cutting depth can be changed by turning the plate.

If different profiles are formed on the individual tips, it is possible to carry out several operations, e.g. turning cylindrical surface, chamfering edge, shape groove, etc. Changing the geometry of individual wedges (eg changing materials).

Claims (2)

A cutting tool with a replaceable plate located in a recess in the holder body, which is connected with its opening to a rod positioned along the holder body, characterized in that the distances (hj, h ₂ , h ₃ ) of the individual tips of the plate (2) from the center of the pin The draw bars (3J) and the geometry of the individual tines, e.g., the radii of the tines (rej, re ₂ , Γε ^) are different.