CN103692160A - Forging method for stabilizer bar used for excavator - Google Patents

Abstract

The invention discloses a forging method for a stabilizer bar used for an excavator. The forging method comprises the following steps: performing centrifugal casting on a blank; performing outer layer centrifugal casting: controlling the weight percentage of all chemical components in molten steel to meet the following requirements after molten steel on the outer layer is melted: 0.23-0.32 percent of C, 0.17-0.28 percent of Mn, 0.15-0.20 percent of Cr, 0.25-0.35 percent of Si, 0.03-0.05 percent of Ti, 0.034-0.045 percent of P, 0.016-0.035 percent of S, 0.28-0.32 percent of Ni, 0.035-0.045 percent of Li, 0.15-0.25 percent of Sn, 0.02-0.06 percent of Cu and balance of Fe; controlling the tapping temperature of the molten steel to be 1550-1650 DEG C; adding casting powder by 5-6kg/m<2> for killing treatment; controlling the outer layer casting temperature to be 1500-1550 DEG C; controlling the rotating linear speed of a cold-type inner wall to be 20-25m/s. The forging method disclosed by the invention is in favor of mass industrial production, and has the advantages that the phenomena that impurities are entrained and a cast cannot be fully filled during a forging process are reduced, the mechanical property of a product is further improved, product materials are saved, and the service life of the product is prolonged.

Description

The forging method of stabiliser bar for a kind of excavator

Technical field

The present invention relates to the forging method of stabiliser bar for a kind of excavator.

Background technology

Stabiliser bar, as the vitals in automotive suspension parts, can improve the roll angular rigidity of suspension, adjusts fore suspension and rear suspension inclination angle stiffness ratio, to guarantee that automobile has the good stability of travelling, thereby guarantees vehicle safety and comfortableness, ride comfort.In industry general producer when surface treatment, be shot-peening or not shot-peening be directly coated with antirust paint, after anti-paint is dry, brush again pitch-dark, this coating corrosion-resistant, service life is short, has potential safety hazard.

Summary of the invention

The object of this invention is to provide the forging method of stabiliser bar for a kind of excavator, make it be beneficial to large batch of industrialized production, and the phenomenon that has reduced appearance folder dirt in forging process, has been not fully filled, the mechanical property of product is further improved, save product materials, improved the die life of product.

Technical scheme of the present invention is as follows:

A forging method for stabiliser bar for excavator, comprises the following steps:

A, centrifugal casting blank

1) outer centrifugal casting step: after outer molten steel, the percentage by weight of controlling each chemical composition in molten steel should meet following requirement: C 0.23～0.32%, Mn 0.17～0.28%, Cr 0.15-0.20%, Si 0.25～0.35%, Ti 0.03-0.05%, P 0.034-0.045%, S 0.016-0.035%, Ni 0.28～0.32%, Li 0.035～0.045%, Sn 0.15～0.25%, Cu 0.02-0.06%, surplus Fe, molten steel tapping temperature is 1550 ℃～1650 ℃, by 5～6kg/m ²add covering slag to carry out calmness and process, outer pouring temperature is 1500 ℃～1550 ℃, and cold type inner wall rotational line speed is controlled at 20～25m/s;

2) intermediate layer and core centrifugal casting step: following weight portion raw material is put into melting in intermediate frequency furnace: the molybdenum of 1.5-2.5 part, 2.0-3.0 the zinc sulfate of part, 1.4-1.6 the nickel of part, 2.2-3.4 the aluminium ingot of part, the steel scrap of 30-38 part, the foundry returns of the scrap iron of 34-45 part and 10-12 part, molten steel tapping temperature is 1500 ℃～1550 ℃, when dropping to 1300 ℃～1350 ℃, pours into a mould outer inwall interface temperature intermediate layer, pouring molten steel temperature is 1400 ℃～1440 ℃, cold mould rotary speed keeps 1350-1500r/min, after intermediate layer thickness reaches 90～100mm, to casting mold inside, fill core and obtain the centrifugal strand of stabiliser bar,

B, forging step

1), the centrifugal strand of stabiliser bar selected according to bent axle model carries out sawing, the size of blanking blank is consistent with Forging Technology rules, range estimation saw kerf gradient is no more than 2 °, burr is not more than 2mm;

2), the blank heating is placed on dozen oxide skin machine the oxide skin of blank surface is cleared up;

3) the press-bending impression of, the blank of having cleared up being put into hammer forging die bends, bang one hammer, then overturn 270 °, blank is put into the terminal section impression of hammer forging die, the temperature of bending is controlled at 1200 ℃～1280 ℃, in press-bending process, with compressed air, constantly clears up the oxide skin in press-bending thorax;

C, heat treatment

Bent axle after step b forges is heated to 900 ℃ and be incubated 1-2h, and oil cooling being to higher than reheating after 100 ℃ to the temperature range of 680 ℃-750 ℃ and being incubated 2h, afterwards water-cooled; After temper, again the head of bent axle is heated to 300-380 ℃, insulation 4-5 hour, then the cooling processing of spraying, the afterbody of bent axle is at 900-1020 ℃, insulation 6-8 hour, then air cooling, last bent axle middle part heat again to temperature be 150～180 ℃, insulation 2-3 hour, puts into iron case cooling in heap;

D, by the workpiece Shot Blasting after heat treatment;

E, by the piece packaging of Shot Blasting.

The present invention passes through technique scheme, overall structure is scientific and reasonable, during use, only need be by the bent axle of different model, according to length, owing to thering is the adaptability of adjustable different model, during production, only need once spindle nose be heated to technique temperature required, just can one-shot forming, thus, the traditional handicraft trouble that has reduced heating for multiple times and repeatedly forged, the corresponding energy consumption that reduced, having reduced material consumption and cost drops into, machining accuracy improves greatly, compared with prior art stock utilization is brought up to more than 90% by present 65%, power consumption reduces by 70% left and right, recruitment reduces 3/4ths, a machine tool two people operate the malleable workpiece of split run more than 550, improve 4 times of left and right of work efficiency, the good effect highly significant producing.

It is as follows that mechanical property of the present invention detects data:

Tensile strength sigma b (MPa): >=1044

Yield strength σ s (MPa): >=922

Percentage elongation δ 5 (%): >=13

Contraction percentage of area ψ (%): >=54

Impact energy Ak v (J): >=67

Notched bar impact strength α kv (J/cm2): >=77

Hardness :≤223HB.

The specific embodiment

A forging method for stabiliser bar for excavator, comprises the following steps:

A, centrifugal casting blank

1) outer centrifugal casting step: after outer molten steel, the percentage by weight of controlling each chemical composition in molten steel should meet following requirement: C 0.23～0.32%, Mn 0.17～0.28%, Cr 0.15-0.20%, Si 0.25～0.35%, Ti 0.03-0.05%, P 0.034-0.045%, S 0.016-0.035%, Ni 0.28～0.32%, Li 0.035～0.045%, Sn 0.15～0.25%, Cu 0.02-0.06%, surplus Fe, molten steel tapping temperature is 1550 ℃～1650 ℃, by 5～6kg/m ²add covering slag to carry out calmness and process, outer pouring temperature is 1500 ℃～1550 ℃, and cold type inner wall rotational line speed is controlled at 20～25m/s;

2) intermediate layer and core centrifugal casting step: following weight portion raw material is put into melting in intermediate frequency furnace: the molybdenum of 1.5-2.5 part, 2.0-3.0 the zinc sulfate of part, 1.4-1.6 the nickel of part, 2.2-3.4 the aluminium ingot of part, the steel scrap of 30-38 part, the foundry returns of the scrap iron of 34-45 part and 10-12 part, molten steel tapping temperature is 1500 ℃～1550 ℃, when dropping to 1300 ℃～1350 ℃, pours into a mould outer inwall interface temperature intermediate layer, pouring molten steel temperature is 1400 ℃～1440 ℃, cold mould rotary speed keeps 1350-1500r/min, after intermediate layer thickness reaches 90～100mm, to casting mold inside, fill core and obtain the centrifugal strand of stabiliser bar,

B, forging step

1), the centrifugal strand of stabiliser bar selected according to bent axle model carries out sawing, the size of blanking blank is consistent with Forging Technology rules, range estimation saw kerf gradient is no more than 2 °, burr is not more than 2mm;

2), the blank heating is placed on dozen oxide skin machine the oxide skin of blank surface is cleared up;

3) the press-bending impression of, the blank of having cleared up being put into hammer forging die bends, bang one hammer, then overturn 270 °, blank is put into the terminal section impression of hammer forging die, the temperature of bending is controlled at 1200 ℃～1280 ℃, in press-bending process, with compressed air, constantly clears up the oxide skin in press-bending thorax;

C, heat treatment

Bent axle after step b forges is heated to 900 ℃ and be incubated 1-2h, and oil cooling being to higher than reheating after 100 ℃ to the temperature range of 680 ℃-750 ℃ and being incubated 2h, afterwards water-cooled; After temper, again the head of bent axle is heated to 300-380 ℃, insulation 4-5 hour, then the cooling processing of spraying, the afterbody of bent axle is at 900-1020 ℃, insulation 6-8 hour, then air cooling, last bent axle middle part heat again to temperature be 150～180 ℃, insulation 2-3 hour, puts into iron case cooling in heap;

D, by the workpiece Shot Blasting after heat treatment;

E, by the piece packaging of Shot Blasting.

Claims (1)

1. a forging method for stabiliser bar for excavator, is characterized in that, comprises the following steps:

A, centrifugal casting blank

1) outer centrifugal casting step: after outer molten steel, the percentage by weight of controlling each chemical composition in molten steel should meet following requirement: C 0.23～0.32%, Mn 0.17～0.28%, Cr 0.15-0.20%, Si 0.25～0.35%, Ti 0.03-0.05%, P 0.034-0.045%, S 0.016-0.035%, Ni 0.28～0.32%, Li 0.035～0.045%, Sn 0.15～0.25%, Cu 0.02-0.06%, surplus Fe, molten steel tapping temperature is 1550 ℃～1650 ℃, by 5～6kg/m ²add covering slag to carry out calmness and process, outer pouring temperature is 1500 ℃～1550 ℃, and cold type inner wall rotational line speed is controlled at 20～25m/s;

2) intermediate layer and core centrifugal casting step: following weight portion raw material is put into melting in intermediate frequency furnace: the molybdenum of 1.5-2.5 part, 2.0-3.0 the zinc sulfate of part, 1.4-1.6 the nickel of part, 2.2-3.4 the aluminium ingot of part, the steel scrap of 30-38 part, the foundry returns of the scrap iron of 34-45 part and 10-12 part, molten steel tapping temperature is 1500 ℃～1550 ℃, when dropping to 1300 ℃～1350 ℃, pours into a mould outer inwall interface temperature intermediate layer, pouring molten steel temperature is 1400 ℃～1440 ℃, cold mould rotary speed keeps 1350-1500r/min, after intermediate layer thickness reaches 90～100mm, to casting mold inside, fill core and obtain the centrifugal strand of stabiliser bar,

B, forging step

1), the centrifugal strand of stabiliser bar selected according to bent axle model carries out sawing, the size of blanking blank is consistent with Forging Technology rules, range estimation saw kerf gradient is no more than 2 °, burr is not more than 2mm;

2), the blank heating is placed on dozen oxide skin machine the oxide skin of blank surface is cleared up;

3) the press-bending impression of, the blank of having cleared up being put into hammer forging die bends, bang one hammer, then overturn 270 °, blank is put into the terminal section impression of hammer forging die, the temperature of bending is controlled at 1200 ℃～1280 ℃, in press-bending process, with compressed air, constantly clears up the oxide skin in press-bending thorax;

C, heat treatment

Bent axle after step b forges is heated to 900 ℃ and be incubated 1-2h, and oil cooling being to higher than reheating after 100 ℃ to the temperature range of 680 ℃-750 ℃ and being incubated 2h, afterwards water-cooled; After temper, again the head of bent axle is heated to 300-380 ℃, insulation 4-5 hour, then the cooling processing of spraying, the afterbody of bent axle is at 900-1020 ℃, insulation 6-8 hour, then air cooling, last bent axle middle part heat again to temperature be 150～180 ℃, insulation 2-3 hour, puts into iron case cooling in heap;

D, by the workpiece Shot Blasting after heat treatment;

E, by the piece packaging of Shot Blasting.