CN1181943C - Broach - Google Patents

Abstract

The invention provides a broach (cutting tool) which can perform stable work without a deviation to the right/left of the broach even in the case of work for a part of an asymmetric workpiece. This broach 11 is characterized by (1) having a plurality of blades 12 arranged in the lengthwise direction of the broach to make each blade 12 in a protruded shape in the lengthwise direction of the broach. (2) The broach 11 makes the blade 12 symmetrical relative to a right/left center line 14 passing through the tip end 13 of the protruded shape to extend in the lengthwise direction of the broach.

Description

Broaching tool

Technical field

The present invention relates to broaching tool as cutting element.

Background technology

Prior art such as Fig. 5 or shown in Figure 6, the blade 2 of broaching tool 1 is made the shape (Fig. 6) perpendicular to (Fig. 5) length direction (machine direction) or one-tenth pitch angle alpha will.

But ratio as shown in Figure 3 and Figure 4, from the forging plane of the nut seat surface 4 of building machinery track link 3 to the processing in level and smooth cutting face, be the processing left and right sides asymmetric workpiece part 5 (cutting go be represented by dotted lines among Fig. 4 part), put on the machining load disequilibrium on the blade 2 of broaching tool 1, broaching tool 1 changing of the relative positions to the left and right.

Summary of the invention

Even it is a kind of under the situation of the asymmetric workpiece part of processing that purpose of the present invention promptly is to provide, broaching tool can the left and right sides changing of the relative positions yet, can stablize the broaching tool of processing.

For achieving the above object, the present invention's broaching tool is performed as follows processing:

A kind of broaching tool is used for the portion of being cut of workpiece is cut into flat nut seat surface, it is characterized in that described broaching tool has a plurality of blades arranged side by side along the broach length direction, and each blade becomes convex along the broach length direction;

Aforementioned blade is with respect to the left and right sides center line left-right symmetry of passing through the convex tip and extending along the broach length direction.

In above-mentioned broaching tool, owing to the broaching tool blade is made convex along machine direction, in cutting, when blade incision workpiece, put on the machining load of blade by workpiece, with the blade tip is that the center left and right symmetrically puts on the blade, machining load left and right sides balance, and broaching tool can not produce the left and right sides changing of the relative positions or be difficult to the left and right sides changing of the relative positions.

Description of drawings

Fig. 1 is the stereogram of embodiment of the invention broaching tool;

Fig. 2 is the plane during with the broaching tool processing work part of the embodiment of the invention;

Fig. 3 is the front view of building machinery track link;

Fig. 4 is will the broach amplification front elevation of processing part of chain link;

Fig. 5 is the stereogram of existing broaching tool;

Fig. 6 is the stereogram of the existing another example of broaching tool;

The specific embodiment

The broaching tool of the embodiment of the invention is described with reference to Fig. 1, Fig. 2.

As shown in Figure 1, the broaching tool 11 of the embodiment of the invention has a plurality of (most) blade 12 arranged side by side along the broach length direction.The degree of depth of sword incision workpiece that blade 12 is in the machine direction rear is bigger.Each blade 12 becomes convex along broach length direction (machine direction).

Each blade 12 is with respect to left and right sides center line 14 (chain-dotted line) left-right symmetry of passing through convex most advanced and sophisticated 13 and extending along the broach length direction.This left and right sides center line 14 is the lines that extend along the broach length direction by broaching tool 11 width centers, and each blade 12 is the symmetrical center line left-right symmetry with left and right sides center line 14.

The effect of following explanation embodiment of the invention broaching tool.

Supposing to be cut workpiece, such as shown in Figure 3 and Figure 4, is track link 3, is cut workpiece part 5 and is after forging, the nut seat surface 4 before the cutting.It is asymmetric to be cut workpiece part 5 relative center lines 6 left and right sides, by going workpiece part 5 to form smooth nut seat surface 4 with broaching tool 11 cuttings.Broaching tool 11 is moved along the direction vertical with the paper of Fig. 3 and Fig. 4, and workpiece part 5 is gone in cutting.

As shown in Figure 2, during the blade 12 incision workpiece parts 5 of broaching tool 11, blade 12 is a center left and right symmetrically incision workpiece part 5 with the tip 13 of blade 12.Thereby, be added on the machining load of blade 12 from workpiece part 5, be that the center left-right symmetry is added on blade 12 with the tip 13 of blade 12, be added on the load left and right sides balance of blade 12.The part that is equipped with shade (mesh) line in Fig. 2 is born load, suffered load left-right symmetry.Its result, the not changing of the relative positions to the left and right of broaching tool 11 perhaps is difficult to the changing of the relative positions in the cutting, can stablize processing.The broaching tool left and right directions changing of the relative positions as the prior art, difficult processing can not produce under the situation of using broaching tool of the present invention with stable phenomenon, are difficult in other words produce.

According to the broaching tool of first aspect present invention, owing to along the broach length direction a plurality of blades are arranged, each blade becomes convex along broach length direction (machine direction), during processing work, be added on the machining load left and right sides balance of broaching tool by workpiece, broaching tool can side-to-side vibrations in the processing, and processing is stable.

Broaching tool according to second aspect present invention, because blade is made with respect to the left and right sides center line left-right symmetry of passing through the convex tip and extending along the broach length direction, so put on the machining load left and right sides balance of broaching tool blade, broaching tool can side-to-side vibrations, and processing is stable.

Claims (1)

1. a broaching tool is used for the portion of being cut of workpiece is cut into flat nut seat surface, it is characterized in that described broaching tool has a plurality of blades arranged side by side along the broach length direction, and each blade becomes convex along the broach length direction;

Aforementioned blade is with respect to the left and right sides center line left-right symmetry of passing through the convex tip and extending along the broach length direction.

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