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A method for improving the hot workability of tin bronze

A hot workability, tin bronze technology, applied in the field of non-ferrous metal materials manufacturing, can solve the problems of easy cracking, difficult forming, poor hot working performance, etc., and achieve good deformation, defect control, and improved mechanical properties.

Active Publication Date: 2017-05-31
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high strength and mechanical properties of tin bronze, and poor thermal processing performance, it is difficult to form or easy to crack during the stamping process, making it difficult to process by stamping

Method used

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  • A method for improving the hot workability of tin bronze
  • A method for improving the hot workability of tin bronze
  • A method for improving the hot workability of tin bronze

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Take the raw materials by weighing the following mass percentages and consider the burning loss, and put the raw materials into the furnace to melt and then cool them into ingots;

[0030] Sn 8.0, P 0.1, Zn≤0.20, Ni≤0.20, Fe≤0.01, Pb≤0.05, the balance is Cu.

[0031] (2) Heating the ingot obtained in step (1) to 750-800° C., taking out the sample and extruding immediately, the extrusion ratio is 6.25, and then cooling in air.

[0032] (3) cold drawing the extruded bar stock to obtain a tin bronze bar stock with a diameter of 80 mm, and then turning and cutting it into a bar stock with a diameter of 34 mm and a length of 50 mm.

[0033] (4) Use a natural gas spray gun to heat the tin bronze bar obtained in step (3) to 820°C and keep it warm for 5 minutes, then put it into a Mecol Press 300T press for stamping, the stamping direction is consistent with the axial direction of the bar, and the stamping time is 1 ~2s.

[0034] The metallographic diagram of the alloy ph...

Embodiment 2

[0037] The preparation process is basically the same as in Example 1, except that in step (4), the thermal processing temperature is 750° C. and the time is 5 min. The metallographic diagram of the tin-bronze alloy structure of the present embodiment after stamping, as image 3 shown, with figure 2 resemblance.

Embodiment 3

[0039] The preparation process is basically the same as that of Example 1, except that in step (4), the thermal processing temperature is 767° C. and the time is 5 minutes. Figure 4 This is the metallographic diagram of the stamped tin-bronze alloy structure in this embodiment. It can be seen that the grains of the alloy structure are obviously refined.

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Abstract

The invention discloses a method for improving thermal processing property of tin bronze. The method comprises the following steps: firstly, weighing raw materials according to mass percentages of chemical elements of tin bronze, melting, and cooling so as to obtain ingots; heating the ingots to 750-800 DEG C, performing extrusion treatment, further cooling to the room temperature, and performing cold-drawing and cutting so as to obtain rods; finally, preheating the rods, and performing stamping treatment, wherein the preheating processing temperature is 750-820 DEG C, and the time is 5-10 minutes. The invention provides the method for improving thermal processing property of tin bronze. According to the method, preheating treatment is performed before stamping treatment, the temperature of preheating treatment and the temperature-keeping time are controlled, a reasonable process route is designed, and the purpose of manufacturing a tin bronze alloy by using a stamping process is achieved; by adopting the method, segregation of a ternary eutectoid structure in the tin bronze alloy can be effectively reduced, alloy crystalline grains can be refined, defects caused in the stamping process can be reduced, and the mechanical property of the stamped tin bronze alloy can be effectively improved.

Description

technical field [0001] The invention relates to the field of manufacturing nonferrous metal materials, in particular to a method for improving the thermal workability of tin bronze. Background technique [0002] Tin bronze has excellent elasticity, corrosion resistance, wear resistance, and good mechanical properties, and is widely used in the production of elastic components and wear-resistant parts. Adding a small amount of phosphorus to tin bronze has a very good deoxidation effect and improves the casting performance of tin bronze, thereby improving the strength, hardness, elastic modulus, fatigue strength and wear resistance of the alloy. On the other hand, the addition of phosphorus will narrow the α phase region of tin bronze and appear Cu 3 P phase, when the content of tin and phosphorus in the alloy reaches a certain value, α+δ+Cu will appear in the alloy 3 The P ternary eutectic structure has a melting point of 628°C. The eutectic structure is easy to segregate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/02C22F1/08
CPCC22C9/02C22F1/08
Inventor 宋振纶杨丽景许赪郑必长姜建军胡方勤
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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