JPH06170748A - Chisel tool - Google Patents

Abstract

PURPOSE: To provide a chisel tool to economically manufacture and ensure a long-useful period and excellent machining capacity in a chisel tool on which an impact stress is applied. CONSTITUTION: A holding part 1 for a chisel tool and a cut part 2 formed of a material of a higher material than that of a holding part are integrally coupled through friction welding 3 at an abutment end face. By forming only a part of a chisel tool by using a high grade material ensuring a useful period and excellent machining capacity, the whole of a tool is especially economically manufactured.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a chisel tool having a holding portion and a cutting portion.

[0002]

BACKGROUND ART A chisel tool used for processing a substance such as rock or concrete is subjected to a high stress particularly leading to wear of a cut portion. For this reason, chisel tools are usually manufactured from expensive high-grade materials.

In the known drilling tool disclosed in DE 7 47 944, the drilling edge is made of an expensive material in view of the fact that the cutting part wears more than the holding part. Weld to the rest of the tool. This method allows the economical manufacture of drill tools.

The known production methods which realize the above-mentioned economic advantages are adequate for drilling tools with rotary movement, but have been considered unusable for tools which are exclusively or predominantly impact-loaded. Tools that are subjected to impact loads can develop stresses that lead to weld separation unless proper consideration is given to their design.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to propose a chisel tool which is economically producible in a chisel tool which is subjected to impact stress, and which can ensure a long service life and excellent working ability.

In order to solve this problem, the chisel tool according to the present invention is characterized by a combination of the following items a] to d]. a] Joining the cutting part to the holding part by friction welding. b] The diameters of the holding portion and the cutting portion should be constant. c] The holding portion has a larger diameter than the cut portion. d] To form the cutting portion with a material higher in quality than the holding portion.

By manufacturing the chisel tool from a combination of dissimilar materials, it is possible to use a higher grade material for the highly worn cutting portion than the holding portion. Even in this case, the use of a cost-effective material for the holding part makes it possible to manufacture the chisel tool as a whole more economically.

In connection with the consideration of shock wave theory and the demand for high working capacity, it has been found that a chisel tool formed in a stepped shape has expected advantages. That is, in connection with performing friction welding in the transition region from the cutting portion to the holding portion, it is possible to provide a sufficient diameter difference before and after this welding location. In addition, the mutual joining of the two parts by friction welding has the advantage that a very economical joining is achieved without any additional material costs. further,
Friction welding is in principle advantageous in terms of rotational accuracy and centering.

[0009] The chisel tool according to the present invention is particularly suitable for physical distribution management in that it can be easily adapted to individual applications and, for example, a special length or a special material according to a specific base can be selected. It is advantageous. In such cases, the specially prepared cutting portion can be joined to a standard retaining portion. Furthermore, since the two parts are joined by friction welding, a new cutting part can be welded in place of the worn cutting part as long as the holding part is usable.

Considering the shock wave theory and considering the influence on workability, it is advantageous to make the diameter of the holding portion 1.1 to 1.3 times the diameter of the cutting portion. that time,
It is important that the retaining portion and the cutting portion each have a constant diameter over their entire length. In this case, it is particularly advantageous if the diameter of the holding part is 1.125 times the diameter of the cutting part.

As a material for the holding portion, particularly 42CrMo4
Steel is preferred. This steel withstands the stresses exerted on the holding part and has a cost advantage, which improves the economy of the entire chisel tool. As a material for the cut part, X50CrMo having sufficient wear resistance related to the processing of the base material.
V51 steel is particularly preferred.

The length ratio between the cut portion and the holding portion can be appropriately changed depending on the application. However, considering impact stress, a specific length ratio is advantageous, and it is particularly preferable that the length of the cut portion is 0.4 to 1.0 times the length of the holding portion.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The chisel tool of the present invention will be described more specifically below with reference to the illustrated embodiments.

As shown in FIG. 1, the chisel tool comprises a holding part 1 and a cutting part 2. The holding portion 1 has a larger diameter than the cutting portion 2. The holding part 1 and the cutting part 2 are connected to each other by friction welding 3 at the butt end faces.

Means for engaging with a tool holding member in a driving device (not shown) is provided in the free end region of the holding portion 1, and this engaging means is formed as a known holding groove 4 in this embodiment.

The cutting portion 2 has an edge 5 at its free end. Edge 5 has a sharpened shape depending on the use of the chisel tool,
It can be formed into a plow shape, a profile shape, or the like.

Further, as shown, the diameters of the holding portion 1 and the cutting portion 2 are made constant over their entire lengths.
The holding part 1 and the cutting part 2 are made of different materials, and in the present invention, the cutting part 2 is made of a higher wear resistant tool material than the holding part 1.

[Brief description of drawings]

FIG. 1 is a front view showing a chisel tool according to an embodiment of the present invention.

[Explanation of symbols]

 1 Holding part 2 Cutting part 3 Friction welding 4 Holding groove 5 Edge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Karl-Heinz Oerri Fleet of Liechtenstein F-9497 Gumpurin Bad Ale 198 (72) Inventor Axel Neukirchen Federal Republic of Germany Day-81539 München Schleierstraße 105

Claims (6)

[Claims] 1. A chisel tool comprising a holding part (1) and a cutting part (2), a] connecting the cutting part (2) to the holding part (1) by friction welding (3), b] The diameters of the holding portion (1) and the cutting portion (2) are constant, c] the holding portion (1) has a larger diameter than the cutting portion (2), and d] the holding portion (1) A chisel tool characterized in that the cutting portion (2) is formed of a high-grade material. 2. The chisel tool according to claim 1, wherein the diameter of the holding part (1) is relative to the diameter of the cutting part (2).
Chisel tool characterized by 1.1 to 1.3 times. 3. The chisel tool according to claim 2, wherein the diameter of the holding part (1) is 1.
A chisel tool characterized by being 125 times larger. 4. The chisel tool according to claim 1, wherein the holding part (1) is made of 42CrMo4 steel. 5. Chisel tool according to any one of claims 1 to 4, characterized in that the cutting part (2) is formed from X50CrMoV51 steel. 6. The chisel tool according to claim 1, wherein the length of the cutting portion (2) is 0.4 to 1.0 times the length of the holding portion (1). A characteristic chisel tool.