CN113102722A

CN113102722A - Injection chamber with novel fused coating

Info

Publication number: CN113102722A
Application number: CN202110364739.0A
Authority: CN
Inventors: 冷岳峰; 唐嘉声; 郑春生
Original assignee: Liaoning Technical University
Current assignee: Liaoning Technical University
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-07-13

Abstract

The invention relates to an injection chamber with a novel fused coating, which comprises local and integral strengthening of the injection chamber, wherein the injection chamber is formed by combining a pressure chamber body and the fused coating. The material characteristics of the molten coating are fully utilized, the requirements of corrosion resistance, wear resistance, high temperature resistance and the like of the injection chamber are met, pits which are easily caused by long-time erosion of high-temperature molten metal on the inner wall of the traditional injection chamber and cracks generated by alternate cold and hot changes are reduced, the manufacturing cost is reduced, and the risk that high-temperature aluminum liquid hurts people due to cracking of the injection chamber is avoided to a certain extent.

Description

Injection chamber with novel fused coating

Technical Field

The invention relates to the field of die casting and dies, in particular to a novel injection chamber for a fused coating.

Background

The injection chamber is matched with an upper punch of an injection rod and connected to the near end of an injection chamber body, when an aluminum liquid is poured from a gate at the far end of the injection chamber body, the injection head pushes the aluminum liquid in a molten state into a die-casting model, and the aluminum liquid is solidified and formed into a die-casting part after a certain time. The injection chamber is not only repeatedly subjected to the friction of the punch in the working process, but also the inner wall surface of the injection chamber is easily abraded and corroded under the pouring of high-temperature aluminum liquid, the service life of a product is short, and the low service life has great influence on the working efficiency and the cost of the injection chamber.

In the prior art, in order to improve the injection chamber, various solutions aiming at the problem of erosion of the pressure chamber have been developed at home and abroad, but at present, the most effective solution still does not exist, for example, the injection chamber made of high-cost hot-work die steel and other different materials is developed, in order to improve the performance of the injection chamber, the service life of the injection chamber is prolonged by adopting a surface strengthening processing mode, and the adopted heat treatment modes comprise modulation, quenching, nitriding treatment and the like.

The nitriding treatment is physically combined, so that the combined layer is thin and brittle, is not firm in practice, has low aluminum liquid erosion resistance, is easy to fall off after being impacted, and the performance of the injection chamber after falling off is remarkably reduced.

Therefore, the invention aims to improve the upper injection chamber in the prior art and solves the problems of cracking, pits and the like caused by aluminum liquid erosion.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides an injection chamber with a novel fused coating, which can solve the problem that the service life of the existing injection chamber is not long.

In order to solve the above problems, the present invention provides an injection chamber having a novel cladding layer, comprising:

the injection device comprises a cylindrical injection chamber body, wherein the injection chamber body comprises a proximal end part matched with an injection punch head and a distal end with a gate opening, and a laser cladding layer is processed on the inner surface of the injection chamber.

Preferably, the molten coating of the shot chamber comprises, by weight, 0.75-0.95% C, 24-25% Cr, 7-8% W, 2-4% Si, no more than 0.3% Mn, no more than 1.0% Fe, no more than 1.0% Mo, 8-12% Ni, and the balance cobalt.

Preferably, the molten coating of the injection chamber is subjected to molten coating by using laser cladding equipment, the laser cladding process is carried out in an Ar protective gas environment, the laser power is set to be 800-1200W, the diameter of a light spot is 1.5-17 mm, the cobalt alloy powder is subjected to laser cladding at a laser scanning speed of 3-7 mm/s, and the thickness of the molten coating which is completely distributed on the inner wall surface of the injection chamber is 1-3 mm.

Preferably, the injection chamber with the novel hot-dip coating layer is characterized in that the scanning overlapping rate of the laser scanning is 30-50%.

Preferably, the injection chamber with the novel hot-dip coating layer is characterized in that the fineness of powder for the solubility of the injection chamber is 85-150 meshes.

The invention has the following effects that the metal containing the components is adopted to manufacture the molten coating, the molten coating has super-strong corrosion resistance, the service life of the pressure chamber can be greatly prolonged, and the service life can reach 2-3 times of that of a common pressure chamber through tests.

According to the formula of the research, the characteristics of the injection chamber are combined, the surface layer structure of the injection chamber is changed through the structural change of the iron-carbon alloy phase under the action of high temperature of iron-carbon elements, the effects of isolating and protecting the matrix material of the injection chamber are achieved, and the fusion plating layer and the matrix material have good binding force, equivalent thermal expansion coefficients, good hardness and shock resistance through different proportions of rare metals of cobalt, chromium and nickel, and have good protection effect on the injection chamber.

Drawings

Fig. 1 is a schematic view of a novel fusion plating shot chamber of the present invention.

The invention is further illustrated with reference to the following figures and examples.

00-injection chamber body, 01-sprue gate, 001-injection chamber near end, 002-injection chamber far end and 10-injection chamber melt-plating layer.

Detailed Description

Referring to fig. 1, the structure of the shot chamber with the novel cladding layer provided by the invention comprises a cylindrical shot chamber body 00 made of H13, the shot chamber body comprises a proximal end 001 matched with a shot punch and a distal end 002 with a gate opening, and a laser cladding layer 10 is processed on the inner wall surface of the shot chamber body.

According to the embodiment, the molten coating of the injection chamber comprises, by weight, 0.75-0.95% of C, 24-25% of Cr, 7-8% of W, 2-4% of Si, not more than 0.3% of Mn, not more than 1.0% of Fe, not more than 1.0% of Mo, 8-12% of Ni, and the balance cobalt.

According to the embodiment, the molten coating of the injection chamber is subjected to molten coating by using laser cladding equipment, the laser cladding process is carried out in an Ar protective gas environment, the laser power is set to be 800-1200W, the diameter of a light spot is 1.5-17 mm, the cobalt alloy powder is subjected to laser cladding at a laser scanning speed of 3-7 mm/s, and the thickness of the molten coating which is completely distributed on the inner wall surface of the injection chamber is 1-3 mm.

According to the embodiment, the scanning overlap ratio of the laser scanning is 30-50%, and the injection chamber with the novel fused coating is characterized in that the fineness of powder for the solubility of the injection chamber is 85-150 meshes.

And after the injection chamber of the melt plating is completely cooled, machining the pressure chamber to the corresponding size requirement.

It should be noted that the laser melting method is only one of specific examples, and that several modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An injection chamber having a novel cladding layer, comprising:

the injection device comprises a cylindrical injection chamber body, wherein the injection chamber body comprises a proximal end part matched with an injection punch head and a distal end with a gate opening, and a laser cladding layer is processed on the inner surface part of the injection chamber.

2. The shot chamber of claim 1 having a novel molten coating thereon wherein: the molten coating of the injection chamber comprises the following components, by weight, 0.75-0.95% of C, 24-25% of Cr, 7-8% of W, 2-4% of Si, no more than 0.3% of Mn, no more than 1.0% of Fe, no more than 1.0% of Mo, 8-12% of Ni, and the balance cobalt.

3. The shot chamber of claim 1 having a novel molten coating thereon wherein: and carrying out melt plating on the melt plating layer of the injection chamber by using laser cladding equipment, carrying out the laser cladding process in an Ar protective gas environment, setting the laser power to be 800-1200W and the diameter of a light spot to be 1.5-17 mm, carrying out laser cladding on the cobalt alloy powder at the laser scanning speed of 3-7 mm/s, and setting the thickness of the melt plating layer fully distributed on the inner wall surface of the injection chamber to be 1-3 mm.

4. The shot chamber with the novel molten coating as defined in claim 1 wherein said laser scanning has a scan overlap ratio of 30 to 50%.

5. The shot chamber with the novel hot-dip coating as defined in claim 1 wherein said powder fineness for the hot-dip coating of the shot chamber is 85-150 mesh.