JPS5844942A - Trimming method for end face of link for catapillar and its punching unit - Google Patents

Abstract

PURPOSE:To prevent occurrence of laps at the end face of links and to improve the flatness of the end face, by regulating the width of the parallel section of the cutting edge of the trimming die which performs punch trimming at the end face of links to >=1/2 of the width of the end face of links. CONSTITUTION:A blank material 1 which has been subjected to the heating, rough forging, and finish forging is placed on a stripper 4 and a punch 5 is lowered. Then, the blank material is subjected to punch trimming work by a punching die 6 for trimming, whose parallel cutting edge part has a width which is >=1/2 of the width of the end face of the link. In this way, occurrence of fins at the end face of links is prevented and the flatness of the end face is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of machining end girders of endless track links such as construction machines such as bulldozers, and a metal product for the machining.

The most common conventional link manufacturing method is to perform a hot forging forming process (KII), tempering, and then mechanically cutting the end face of the link. In other words, in this case, the machining in the direction of link jlI is performed by cutting with a milling cutter or the like.
However, the machining speed is slow and the machining process is high, making it difficult to process. Therefore, in the hot processing of the first enamel-making process, the reed 11
(hot shaving trim) processing method was adopted. However, in this case, there are many cases where a sharp shackle occurs on the sheared end surface.
KJtI2 at the periphery of the edge of the stomach is 0.3%, even if it is small.
If there is a large amount, 0.7%, average *O, SX shackle will be produced. A link with a shank on the end face such as ζO cannot be used as a shaving product at all depending on the situation, or it may crack due to stress concentration between the link and the roller aO*melting point KsP. 〈Because I want to do something, I prefer not to do it.

Therefore, as a result of research into the causes of cracks caused by the shearing process on the end face of the link, the present inventor found that the vertical pressure applied by the shear blade when shearing the end face of the link compresses the wall thickness of the end face of the link, resulting in the shearing of the end face of the link. It has become clear that as the link progresses, a portion of the surface of the lake that is released from compression expands to the rear of the shear blade, creating a curved shank on the end surface as a whole. (
#! (See Figure 2).

Furthermore, subsequent research has revealed that it is influenced by the width of the shear OSt line shearing blade of the link jIiIrJ, that is, the width of the parallel part of the cutting blade of the die that trims the link end djJ. Ta.

Therefore, the inventor of the present invention conducted an experiment in which the width of the cutting edge was changed in stages for trimming the end face of the link, and as a result, a similar result was confirmed.

Experiment 'Example 1 Trimming the end of the link When the width of the parallel part of the cutting edge of the jig die was set to 1/3 of the width of the link end, a shackle with a maximum floor height of approximately 0.2X was created between the end of the link. Ta.

Experimental Example 2 Trimming die 6 on the link end face When the cutting blade was made with a width of 1/2 of the width of the link end face, a burr with a maximum depth of about 0.05× was created on the link end face.

Experimental Example 3 When the link end surface was removed using a cutting blade whose width was set parallel to the cutting edge of a tri-writing die to be three-fourths of the link end drawing width, almost no dents were produced on the link end surface.

Judging from the above experimental results, the degree of shading between the link ends is 0.0, which is sufficient for actual use. Since it is within I It becomes clear that it is preferable to have a ring of cutting edges of degrees.

Furthermore, in the case of KC, as shown in Figure #I1, link material α) is lowered! The stripper (4) is placed on the stripper (4) installed on top of the spring (2), and the stripper (4) is pressed and fixed from above by the upper mold (5).
) is lowered to face the end face of the link, and by performing the finishing process using the ring metal m (6) provided on the left and right sides, the flatness of the link surface can be improved.

The above-mentioned method of the present invention and goldff1f:1! ! ! By using this method, it is possible to omit the extra machining required in the conventional method when manufacturing links, and to reduce costs. It has various beneficial effects, such as being able to obtain a product that is of good quality.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a link end face trimming mold according to an embodiment of the present invention, and is an explanatory diagram showing a trimming state of a link end face. α)...Link (2)...Bottom III (4)・
...Stripper □(5)...Top lid (6)...
Trimming mold Figure 1 Figure 2

Claims (2)

[Claims] (1) In the link machining process S that goes through the processes of heating the link material, rough punching, finishing punching, link end face O trimming, etc., the width of the link end l1iO trimming die Q cutting edge parallel portion is made smaller than the link end face width. #I characterized by
@ Triing method for orbital belt link j11ItJ. (2) Mugen sail road characterized by using a cutting blade whose width of the parallel part of the cutting blade of the tri-engaging die is at least equal to the width of the end face of the link when sealing between the ends of the link. Mold for trimming Imperial Sunku m-ga.