CN202684011U - Plunger chip of die-casing machine - Google Patents

Abstract

The utility model relates to pressure casing equipment, in particular to a plunger chip of a die-casing machine. The plunger chip of the die-casing machine solves the problems that a beraloy working layer is too heavy and a thermal expansion amount is too large in a die-casing head in existing technology. The utility model provides a die-casing head with a thin-wall working layer. The die-casing head comprises a die-casing head core and an alloy layer. The die-casing head core is a hollow cylinder, and an outer connecting port of the hollow cylinder is in a thread structure. The cylinder is made of cast iron material, and the outer surface of the cylinder is a sprayed alloy layer. Cast iron with lower cost and small coefficient of linear expansion is used for the die-casing head core, a high molybdenum high cobalt nickel base alloy layer resistant to erosion of high temperature is sprayed on the outer surface of the die-casing head, so that the service life of the die-casing head is doubled and the working efficiency of the die-casing machine is improved greatly.

Description

A kind of die casting machine punch

Technical field

The utility model belongs to compression casting equipment, is the rapid wear accessory of die casting machine, particularly a kind of die casting machine punch.

Background technology

Die casting machine punch is the rapid wear accessory of die casting machine in the compression casting, fused aluminiums main and more than 700 ℃ contact in the work, stand cold cycling repeatedly, its material of this working condition requirement must have good elevated temperature strength, high-wearing feature, high-termal conductivity, high heat-resistant anti-fatigue intensity and good toughness and high temperature oxidation resistance.Traditional diecasting punching head adopts the carbon steel main body mostly, inlays wear-resistant sleeve at external diameter and processes, and the life-span is low.For example Chinese patent CN102274946A relates to a kind of Combined die-casting punch.Comprise drift, the axial pilot hole of punch-center, hole inwall connect uses screw thread, it is characterized in that the working lining that beryllium bronze alloy material that the cylindric drift core that is made of cast iron materials and casting ladle overlay on drift core outer rim consists of is composited; The beryllium bronze alloy material of described formation working lining is the Be-Cu-Co alloy material, and described working lining and drift core adopt tongue and groove to inlay and form.And for example Chinese patent CN2614816Y discloses a kind of Double-metal pressure casting punching head, is comprised of drift core and working lining, and working lining is the high-quality antifriction alloy, and the drift core is plain cast iron.Described working lining is beryllium-bronze, is preferably the thick beryllium-bronze of 3～5mm.The utility model adopts casting technique that cast iron and beryllium-bronze are cast as one, and makes its cost and magnesium iron drift quite (considering MAT'L recycling), has good wearability, thermal conductivity and high patience and have beryllium-bronze concurrently.The ubiquitous shortcoming of the wearing layer of these die casting heads is: wearing layer is too thick, and is economical not; And the linear expansion coefficient of beryllium bronze alloy material is too large, and the larger heat expansion amount of thickness is also larger, therefore is unfavorable for cold cycling use repeatedly, and fall short of actual life.

Also have Chinese patent CN1712154A that a kind of have good sliding and the plunger tip for die casting machines of sealing are provided.Have slip in plunger bushing (60), motlten metal is being forced in the plunger tip for die casting machines of the punch body (20) in the mould, punch body (20) is made of metal material, circumferential lateral surface by and the plunger bushing inner surface between slip cap (40) the covering good sliding of performance and sealing, that consist of with the hard resin material.What this die casting head adopted is the slip cap that the less hard resin material of line expansion factor forms, solved the too large problem of slip cap swell increment, but because the heat resisting temperature of hard resin material is usually below 300 ℃, because high temperature ageing, the life-span of die casting head also falls short of.

The utility model content

The purpose of this utility model is to overcome in the prior art, and the die casting head adopts the beraloy working lining too thick and heavy, and the problem that the heat expansion amount is excessive provides a kind of a kind of die casting head of thin-walled working lining.

To achieve these goals, the utility model is by the following technical solutions: a kind of die casting head, comprise a die casting core and alloy-layer, a described die casting core is hollow cylinder, the external tapping of hollow body is helicitic texture, described cylinder is the cast iron materials manufacturing, and cylindrical cylindrical outer surface is the spraying alloy-layer, and alloy layer thickness is 30-100 μ m.

Innovative point of the present utility model is in fact, has used linear expansion coefficient less, the cast iron die casting core that cost is low, and the cylindrical outer surface of a die casting core is the spraying alloy-layer.Such advantage is that the high alloy layer thickness of linear expansion coefficient is very thin, therefore cold and hot swell increment is very little, guaranteed the gap substantially constant of die casting head and die casting cavity body, namely reduced manufacturing cost, improved service life again, by our repeatedly test, the average life span of this die casting head has surpassed 150,000 times, has improved widely the production capacity of die casting machine.Adopting the die casting head of embedded alloy structure, is to do something against one's will, because the die casting head is as long as wear extent surpasses 30 μ m, this die casting head has just been scrapped, and thicker alloy-layer can only be the waste material, and the thickness of alloy-layer selects 30-60 μ m just enough.Cast(ing) surface spraying alloy-layer will guarantee that firmness is very difficult, only have and adopt the large carbon steel of linear expansion coefficient or a steel alloy making die casting core to carry out surface spraying, the die casting head of this structure is because the line bulk of a die casting core is excessive, and its life-span also is very limited.

As preferably, a described die casting core adopts spheroidal graphite cast-iron or infinitely chilled ductile cast iron manufacturing.The hardness of spheroidal graphite cast-iron and infinitely chilled ductile cast iron is moderate, and linear expansion coefficient is smaller, is fit to very much the working environment that repeatedly colds and heat succeed each other and change of die casting head.

As preferably, described spraying alloy-layer is the nickel-base alloy of the high cobalt of high molybdenum.The nickel-base alloy of the high cobalt of this high molybdenum is through repetition test, with the manufacturer custom-made, its melt temperature is more than 1200 ℃, purpose is to improve the high temperature anti-corrosion capability of die casting head, the damage of common die casting head is owing to alloy-layer under hot environment corrodes and the coefficient result of wearing and tearing mostly.

As preferably, the hardness of described spraying alloy-layer is HRC48-52.Usually all more than HRC55, price is relatively high for the hardness of die casting cavity body inner surface, makes complexity, and in order to prolong the service life of die casting cavity body, the hardness of die casting head spraying alloy-layer should not be too high.

As preferably, described spraying alloy-layer component is:

Cr 15-20%；

Si 3.5-5.5%；

B 3-4.5%；

Fe ≦10%；

O ≦0.08%；

C 0.5-1.1%；

Mo 3-8%；

Co 1.5-5.3%；

The Ni surplus.

Be applied to a kind of manufacturing process of above-mentioned die casting header structure: cast iron bar is car-finish turning-pickling (temperature 50-90 degree just, time is 40-100 minute)-spraying (must spray alloy-layer in 30 minutes after the pickling, the melt temperature of alloy powder is more than 1200 ℃)-finish turning-correct grinding.At first be that the cost of material is low, manufacturing procedure is few, and key is pickling and pyrolytic coating program, and the time to spraying after the pickling must be controlled in 30 minutes and finishes, otherwise cast(ing) surface will oxidation, affects the firmness of alloy-layer.

The utlity model has following effect: the cast iron that the employing cost compare is low, linear expansion coefficient is little is as a die casting core, a die casting outer surface sprays the high cobalt nickel-base alloy layer of high molybdenum of high temperature resistant erosion, so that be multiplied the service life of die casting head, improve widely the operating efficiency of die casting machine, had significantly technological progress.

Description of drawings

Fig. 1 is structural representation of the present utility model.

The specific embodiment

Below in conjunction with the drawings and specific embodiments the utility model is further described.

Embodiment 1: as shown in Figure 1, a spheroidal graphite cast-iron die casting die casting core 100, there is cavity 101 inside, and cavity 101 outsides are screw threads 102, the nickel base alloy layer 200 that the cylindrical outer surface of a casting die casting core 100 and end face are coated with the high cobalt of high molybdenum, alloy layer thickness is 30 μ m.

Embodiment 2: as shown in Figure 1, an infinitely chilled ductile cast iron die casting die casting core 100, there is cavity 101 inside, and cavity 101 outsides are screw threads 102, the nickel base alloy layer 200 that the cylindrical outer surface of a casting die casting core 100 and end face are coated with the high cobalt of high molybdenum, alloy layer thickness is 60 μ m.

Specific embodiment described herein only is to the explanation for example of the utility model spirit, the utility model person of ordinary skill in the field can revise or replenish or adopt similar mode to substitute and combination, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.

Claims (5)

1. a die casting machine punch comprises a die casting core and alloy-layer, and a described die casting core is hollow cylinder, and the external tapping of hollow body is helicitic texture, it is characterized in that: described cylindrical cylindrical outer surface is the spraying alloy-layer.

2. a kind of die casting machine punch according to claim 1 is characterized in that, a described die casting core adopts spheroidal graphite cast-iron or infinitely chilled ductile cast iron.

3. a kind of die casting machine punch according to claim 2 is characterized in that, described spraying alloy-layer is the nickel-base alloy of the high cobalt of high molybdenum.

4. a kind of die casting machine punch according to claim 3 is characterized in that, the hardness of described spraying alloy-layer is HRC48-52.

5. according to claim 1 and 2 or 3 or 4 described a kind of die casting machine punchs, it is characterized in that, described spraying alloy layer thickness is 30-100 μ m.

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