Excavator dipper tooth and method of its manufacture

FIELD: mechanical engineering; design of excavator dipper teeth.

SUBSTANCE: parallelepiped inserts are fitted in tooth point and inserts of cylindrical form are fitted further on along working plane. Inserts manufactured of wear-resistant cast iron, owing to shadow effect, prevent intensive abrasive wear of steel base, thus increasing service life of tooth. As wear-resistant inserts are arranged only on one of working surfaces, other surfaces (opposite one) is subjected to more intensive wear which provides finally sharpening of tooth in process of operation. Use of such design and method of manufacture make it possible to increase service live more than two times and provided reliability of operation of excavator dipper.

EFFECT: increased service life and provision of self-sharpening of tooth point owing to fitting-in small size wear-resistant cast iron parts in steel base.

4 cl, 4 dwg

 

The invention relates to the field of engineering, in particular to the structure of teeth for excavator buckets.

Bucket teeth excavator in operation are subjected to abrasive wear with the presence of dynamic loads. The wear is mostly in the form of micro - and macrostomia. When designing rocky grounds set of teeth for excavator buckets intense wear and service life of high-manganese steel 110G13L does not exceed 5-10 days [1].

Excavator work with worn teeth reduces productivity and increases the wear of the machine, leads to additional cost of replacement of worn parts.

Known tooth bucket [2], containing to increase durability and ensure samosatene carbide insert mounted in the middle part along the longitudinal axis.

The disadvantage of this design is that it does not provide protection against wear of the working surfaces of the tooth and protects only the front part and the core.

Also known tooth bucket, containing inserts of wear-resistant cast iron, mounted on the working surfaces subjected to abrasive wear [3].

Reinforcement of teeth for excavator buckets large wear-resistant inserts allow you to increase the resistance of 20-25%, depending on the conditions R the bots.

This design is taken by the authors for the prototype.

A significant drawback of such teeth, with a large plate of wear-resistant cast iron, is insufficient mechanical strength of the plates.

In operation when the pounding on the rocky ground is the destruction of the plates of brittle wear-resistant cast iron and their subsequent spalling, and then increases the intensity of abrasive wear. Life sharply decreases and does not meet the requirements of end-users.

The aim of the present invention is to increase the service life of the tooth bucket and the effect of samosatene.

This objective is achieved in that the design of the tooth enabled insert of wear-resistant cast iron in the form of individual parts parallelepipedal and has a cylindrical shape with a reverse taper and are located on the working surfaces in the steel base.

Parallelepipedal form inserts are located in the tip of the tooth in one row with an interval of 0.5-1.5 width, followed by evenly spaced cylindrical insert in rows with spacing from each other, equal to 1.5-3.0 diameter insert.

The proposed solution allows to increase the resistance of the inserts of wear-resistant cast iron, as they are made in the form of small parts.

Each individual element (the rate with small sizes), located in the plastic steel base, due to its small linear dimensions makes them almost invulnerable to damage from shock loads.

Insert the proposed design, made of durable cast iron, can help protect the working surface of the tooth from abrasive wear due to the shadow effect during the entire period of wear inserts in thickness.

Further, after wear of the inserts, the process of abrasive wear occurs, as in ordinary reinforced the details.

Parallelepipedal form wear-resistant inserts adopted to maximize protection of the working surface at the tip of the tooth.

Protect the rest of the (smooth) surface is cylindrical inserts, as the most rational, providing the lowest internal stress and increased tremendousamount when casting, which increases operational characteristics and reliability of the tooth.

At the location of the wear-resistant inserts on one of the working surfaces of the tooth bucket allows you to create additional effect of samosatene.

Maintaining tooth bucket in castrandom able to reduce costs and improve performance.

Figure 1 presents the tooth bucket, reinforced with inserts of wear-resistant cast iron (section a-a).

<> Tooth bucket consists of a housing (1) and a shank (2), steel (base), and inserts parallelepipedal (3) and cylindrical (4) forms, are made of durable cast iron.

Figure 2 presents the tooth of the bucket from the side of the wear-resistant inserts (top view).

Wear-resistant inserts parallelepipedal forms are located on the front cutting edge of the tooth (at the tip) in one row with an interval of 0.5-1.5 the width of the insert, the length and thickness of which are defined constructively and do not exceed 2-3 times the width.

Cylindrical inserts are evenly spaced in rows with spacing equal to 1.5-3.0 diameter insert.

This arrangement of the wear-resistant inserts provides protection to the steel substrate from abrasion through the use of shadow effect.

The use of teeth for excavator buckets proposed design will improve the resistance of inserts and abrasive wear resistance, which will lead to a substantial increase in the service life of the product.

A known method of manufacturing a tooth bucket [3] with the strengthening of the working surface by surface alloying.

The method consists in the fact that in the mold cavity filled insert, made of powders of ferro-alloys with liquid glass. When the die casting steel ferro-alloys are melted and alloyed surface is chestny working layer of the casting.

Alloying special ferroalloys strengthens the working surface, making it more wear resistant. The resistance of these teeth was increased by 30-40%, which is clearly not enough.

There is also known a method of manufacture of bucket teeth with hardened work surface insert of wear-resistant cast iron [3].

The method of manufacture is that in the mold during the casting of the tooth is set plate of wear-resistant cast iron and is adjacent to the surface to be peened. In finished form fill steel (base casting) and get the casting tooth reinforced plate of wear-resistant cast iron.

This method of production is taken as a prototype.

The aim of the present invention is to substantially increase the service life of the tooth of the bucket with the effect of samosatene.

This objective is achieved in that the manufacture of the tooth is carried out in the casting process of steel using small inserts of wear-resistant cast iron parallelepipedal and cylindrical forms cast construction with a fastening element in a mold.

The proposed method for the manufacture of tooth differs from the known fact that pre-cast from durable cast iron insert (3) and (4), see figure 3, in the form of small details parallelepipedal and cylindrical cast design is sostavliaut in the lower proforma and fix by means of fastening elements on one or two working surfaces (figure 4, cross-section B-B).

Insert parallelepipedal form is placed on the site, forming the tip of the tooth in one row with an interval of 0.5 to 1.5 of their width, and cylindrical in the continuation of the working surface in rows with spacing equal to 1.5-3.0 diameter inserts.

To perform the internal cavity of the holes in proforma set sand rod (7).

After placing in the bottom proforma wear-resistant inserts and sandy core of its cover with the top proformas (8) element of the Gating system.

The assembled mold through the Gating system (9) is filled with liquid steel.

Zakristallizuetsya reinforced casting further subjected to the knockout from the mold, remove the rod, clean burn, unlike Ablaev and remove burrs.

After this reinforced the casting of the tooth is subjected to heat treatment (hardening) in order to give the plastic properties of the metal base and further increase the wear resistance of cast iron inserts and teeth in General.

This design of the tooth and the manufacturing method allow you to create due to the shadow effect of the wear-resistant part, able to withstand high dynamic loads in combination with high abrasion resistance.

LITERATURE

1. Judeomasonic, Viglance. High manganese austenitic steel 110G13L. M.: metallurgy, 1969

2. S No. 334344.

3. Eben, Cbbytes. Increase service life of cast teeth bucket excavators. "Foundry", 1981, No. 10, p.18-19.

1. Tooth bucket, comprising a casing, liner, made of steel, and the insert, wherein the insert is made in the form of small parts of wear-resistant cast iron parallelepipedal and has a cylindrical shape with a reverse taper and located inside the steel framework on the working surfaces, and insert parallelepipedal forms are located in the tip of the tooth in one row with an interval of 0.5-1.5 width, and a cylindrical evenly on the rest of the working surface in rows with spacing equal to 1.5 to 3.0 times the diameter of the inserts.

2. The teeth of the excavator bucket according to claim 1, characterized in that the wear-resistant inserts parallelepipedal forms have a size of 20×30×10 mm, and a cylindrical diameter 30 mm

3. A method of manufacturing a tooth bucket containing steel and wear-resistant insert according to which in the mold during the casting of the tooth set of the wear-resistant insert in a mold, pour the steel framework, and then reinforced the casting of the tooth is removed from the mold and produce heat treatment, wherein the pre-cast from durable cast iron insert in the form of small details parallelepipedal and cylindricus the second form of cast structures should be put in the bottom proforma and fix by means of fastening elements on one or two working surfaces, when this insert parallelepipedal form is placed on the site, forming the tip of the tooth in one row with an interval of 0.5 to 1.5 of their width, and cylindrical in the continuation of the working surface in rows with spacing equal to 1.5 to 3.0 times the diameter of the inserts, and to run the internal cavity of the holes in the casting of the tooth set of sand core and after placing in the bottom proforma wear-resistant inserts and sand rod cover lower proforma top, then finished mold is poured through the Gating system of the liquid steel, then zakristallizuetsya reinforced casting of the tooth is removed from the mold and perform in the knockout rod, cleaning from burns and sharpening burrs and bays.

4. A method of manufacturing a tooth excavator bucket according to claim 3, characterized in that the wear-resistant inserts parallelepipedal forms are made with size 20×30×10 mm, and a cylindrical diameter 30 mm



 

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