阅读说明：本技术 跑步机手把连接横杆的铸造工艺 (Casting process of connecting cross rod of treadmill handle ) 是由 吴奇隆 于 2021-09-16 设计创作，主要内容包括：本发明公开了跑步机手把连接横杆的铸造工艺,涉及跑步机加工技术领域,包括如下步骤：(1)合金熔炼处理、(2)浇注处理、(3)热处理、(4)时效处理。本发明提供了跑步机手把连接横杆的铸造工艺,此工艺能够快速的实现手把连接横杆的加工制造,并且制造出的产品具有力学品质好、耐腐防锈能力强、使用性能稳定性等优点,且此工艺方法较为简单。(The invention discloses a casting process of a handle connecting cross rod of a treadmill, which relates to the technical field of treadmill processing and comprises the following steps: (1) alloy smelting treatment, (2) casting treatment, (3) heat treatment, and (4) aging treatment. The invention provides a casting process of a handle connecting cross rod of a treadmill, which can rapidly realize the processing and the manufacturing of the handle connecting cross rod, and the manufactured product has the advantages of good mechanical quality, strong corrosion resistance and rust resistance, stable service performance and the like, and the process method is simpler.)

1. The casting process of the connecting cross rod of the treadmill handle is characterized by comprising the following steps of:

(1) alloy smelting treatment:

smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;

(2) pouring treatment:

carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment during the die casting, and taking out and cooling for later use after the ultrasonic treatment is finished;

(3) and (3) heat treatment:

carrying out heating treatment, then carrying out water quenching cooling, and finally naturally cooling to room temperature for later use;

(4) aging treatment:

after the natural cooling is finished, man-hour effect processing is carried out on the people, polishing is carried out after the man-hour effect processing is finished, and the people can be obtained after the inspection is qualified.

2. A casting process for a treadmill handle connecting cross bar as recited in claim 1, wherein said alloy of step (1) comprises the following components in corresponding weight percentages: 8.0-9.5% of silicon, 0.1-0.2% of iron, 0.3-0.5% of magnesium, 0.1-0.3% of copper, 0.4-0.7% of manganese, 0.01-0.04% of titanium, 0.01-0.03% of boron, 0.1-0.4% of impurities and the balance of aluminum.

3. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the modifier is added in the amount of 0.5-1% of the total mass of the alloy in step (1); the temperature of the modifier in the corresponding furnace is 750-760 ℃ when the modifier is added.

4. The casting process of the treadmill handle connecting cross bar of claim 3, wherein the modifier is composed of the following components in parts by weight: 20-25 parts of strontium, 10-15 parts of chromium, 1-3 parts of yttrium and 4-8 parts of silver.

5. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the temperature in the furnace is controlled to be 760-770 ℃ during degassing in step (1); and controlling the discharging temperature to be 725-735 ℃ during discharging.

6. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the casting temperature in the step (2) is controlled to be 700 to 710 ℃ and the pressure is controlled to be 0.2 to 0.25 MPa.

7. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the ultrasonic treatment in the step (2) is performed while controlling the ultrasonic frequency to be 700 to 800 kHz.

8. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the heating treatment in step (3) is carried out by heating to 500-520 ℃ within 3.5-4 h, and then carrying out heat preservation treatment at the temperature for 5-7 h.

9. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the water quenching cooling treatment in step (3) is specifically to put the alloy into water quenching liquid for 5-8 min; the water quenching liquid consists of the following components in parts by weight: 3-6 parts of nano titanium carbide, 0.3-0.5 part of hexadecyl trimethyl ammonium bromide, 1-1.5 parts of sodium pyrophosphate, 1-2 parts of silane coupling agent and 260-300 parts of deionized water.

10. The casting process of the treadmill handle connecting cross bar according to claim 1, wherein the artificial aging treatment in the step (4) is a heat preservation treatment at 150-160 ℃ for 5-6 h.

Technical Field

The invention relates to the technical field of treadmill processing, in particular to a casting process of a connecting cross rod of a treadmill handle.

Background

Treadmills are athletic equipment known as running machines. Treadmills provide walking or running exercise effects in a small space using belts that rotate along an endless track, and are therefore widely used in homes or sports centers. Since the treadmill allows a user to perform walking or running exercise at an appropriate temperature indoors even in winter and allows the running speed to be arbitrarily controlled, the demand for the treadmill is increasing.

The treadmill has a structure which is basically similar, comprises handles on two sides and is used for holding and carrying, a cross bar is arranged between the two handles for connection and fixation, the cross bar is beneficial to the stability of the handles, the mechanical quality such as better strength is required, and the treadmill is inevitably contacted with sweat due to body-building use, so that the treadmill also needs to have good corrosion resistance and rust resistance.

In the prior art, the casting method of the cross rod is more traditional, and the mechanical property, corrosion resistance and rust resistance of the processed cross rod are poorer, so that a casting process of the cross rod capable of improving the corrosion resistance and rust resistance is urgently needed to be developed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a casting process of a handle connecting cross rod of a treadmill, and the connecting cross rod processed by the process has good mechanical quality and strong corrosion resistance and rust resistance.

In order to achieve the purpose, the invention provides the following technical scheme:

the casting process of the connecting cross rod of the treadmill handle comprises the following steps:

(1) alloy smelting treatment:

smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;

(2) pouring treatment:

carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment during the die casting, and taking out and cooling for later use after the ultrasonic treatment is finished;

(3) and (3) heat treatment:

carrying out heating treatment, then carrying out water quenching cooling, and finally naturally cooling to room temperature for later use;

(4) aging treatment:

after the natural cooling is finished, man-hour effect processing is carried out on the people, polishing is carried out after the man-hour effect processing is finished, and the people can be obtained after the inspection is qualified.

By adopting the technical scheme, the connecting cross rod of the handle can be quickly machined and formed, has good mechanical and chemical properties, and avoids the problems of reprocessing and complex flow.

Further, the alloy in the step (1) comprises the following components in percentage by weight: 8.0-9.5% of silicon, 0.1-0.2% of iron, 0.3-0.5% of magnesium, 0.1-0.3% of copper, 0.4-0.7% of manganese, 0.01-0.04% of titanium, 0.01-0.03% of boron, 0.1-0.4% of impurities and the balance of aluminum.

By adopting the technical scheme, the alloy with a proper formula is selected, so that the basic performance and the machinability of the cross rod are ensured, and a foundation is laid for subsequent machining.

Further, the addition amount of the modifier in the step (1) is 0.5-1% of the total mass of the alloy; the temperature of the modifier in the corresponding furnace is 750-760 ℃ when the modifier is added.

By adopting the technical scheme, the used modifier can improve the flow property of the aluminum alloy fluid and the stability after heat treatment, and can promote the refinement of the aluminum alloy grains, improve the uniformity of the grains, and enhance the characteristics of integral wear resistance, corrosion resistance and the like.

Further, the modifier is composed of the following components in parts by weight: 20 to 25 parts of strontium and 10 to 15 parts of strontium

Chromium, 1-3 parts of yttrium and 4-8 parts of silver.

By adopting the technical scheme, the effects are better achieved through strictly compatible element components.

Further, the temperature in the furnace is controlled to be 760-770 ℃ during degassing in the step (1); and controlling the discharging temperature to be 725-735 ℃ during discharging.

Further, the casting temperature is controlled to be 700-710 ℃ and the pressure is controlled to be 0.2-0.25 MPa during casting in the step (2).

Further, the ultrasonic frequency is controlled to be 700-800 kHz during ultrasonic treatment in the step (2).

By adopting the technical scheme, the ultrasonic wave is utilized to promote the flow of the melt and the elimination of bubbles, the processing speed is accelerated, and the yield of the product is improved.

Further, the heating treatment in the step (3) is specifically to heat the temperature to 500-520 ℃ within 3.5-4 hours, and then to perform heat preservation treatment for 5-7 hours at the temperature.

Further, the water quenching cooling treatment in the step (3) is specifically that the alloy is put into water quenching liquid and treated for 5-8 min; the water quenching liquid consists of the following components in parts by weight: 3-6 parts of nano titanium carbide, 0.3-0.5 part of hexadecyl trimethyl ammonium bromide, 1-1.5 parts of sodium pyrophosphate, 1-2 parts of silane coupling agent and 260-300 parts of deionized water.

Through adopting above-mentioned technical scheme to special shrend liquid carries out the shrend, can accelerate shrend speed on the one hand, reduces stress and defective rate, and on the other hand can improve the surface quality characteristic of aluminum alloy again, improves its weatherability and stability.

Further, the artificial aging treatment in the step (4) is heat preservation treatment at 150-160 ℃ for 5-6 h.

In summary, compared with the prior art, the invention has the following beneficial effects:

the invention provides a casting process of a handle connecting cross rod of a treadmill, which can rapidly realize the processing and the manufacturing of the handle connecting cross rod, and the manufactured product has the advantages of good mechanical quality, strong corrosion resistance and rust resistance, stable service performance and the like, and the process method is simple, easy to popularize and apply and has great market competitiveness.

Detailed Description

The present invention will be described in detail with reference to examples.

Example 1:

the casting process of the connecting cross rod of the treadmill handle comprises the following steps:

(1) alloy smelting treatment:

smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;

(2) pouring treatment:

carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment during the die casting, and taking out and cooling for later use after the ultrasonic treatment is finished;

(3) and (3) heat treatment:

carrying out heating treatment, then carrying out water quenching cooling, and finally naturally cooling to room temperature for later use;

(4) aging treatment:

after the natural cooling is finished, man-hour effect processing is carried out on the people, polishing is carried out after the man-hour effect processing is finished, and the people can be obtained after the inspection is qualified.

The alloy in the step (1) comprises the following components in percentage by weight: 8.0% of silicon, 0.1-0.2% of iron, 0.3% of magnesium, 0.1% of copper, 0.4% of manganese, 0.01% of titanium, 0.01% of boron, 0.1% of impurities and the balance of aluminum.

The addition amount of the modifier in the step (1) is 0.5 percent of the total mass of the alloy; the modifier is added at a temperature corresponding to 750 ℃ in the furnace.

The modifier consists of the following components in parts by weight: 20 parts of strontium, 10 parts of chromium, 1 part of yttrium and 4 parts of silver.

Controlling the temperature in the furnace to be 760 ℃ during degassing in the step (1); and controlling the tapping temperature to be 725 ℃ during tapping.

And (3) controlling the casting temperature to be 700 ℃ and the pressure to be 0.2MPa during casting in the step (2).

And (3) controlling the ultrasonic frequency to be 700kHz during ultrasonic treatment in the step (2).

The heating treatment in the step (3) is specifically to heat the temperature to 500 ℃ within 3.5h, and then carry out heat preservation treatment for 5h at the temperature.

The water quenching cooling treatment in the step (3) is to put the alloy into water quenching liquid for treatment for 5 min; the water quenching liquid consists of the following components in parts by weight: 3 parts of nano titanium carbide, 0.3 part of hexadecyl trimethyl ammonium bromide and 1 part of

Sodium pyrophosphate, 1 part of silane coupling agent and 260 parts of deionized water.

The artificial aging treatment in the step (4) is heat preservation treatment for 5 hours at the temperature of 150-160 ℃.

Example 2:

the casting process of the connecting cross rod of the treadmill handle comprises the following steps:

(1) alloy smelting treatment:

smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;

(2) pouring treatment:

carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment during the die casting, and taking out and cooling for later use after the ultrasonic treatment is finished;

(3) and (3) heat treatment:

carrying out heating treatment, then carrying out water quenching cooling, and finally naturally cooling to room temperature for later use;

(4) aging treatment:

after the natural cooling is finished, man-hour effect processing is carried out on the people, polishing is carried out after the man-hour effect processing is finished, and the people can be obtained after the inspection is qualified.

The alloy in the step (1) comprises the following components in percentage by weight: 9.0% silicon, 0.15% iron, 0.4% magnesium, 0.2% copper, 0.6% manganese, 0.03% titanium, 0.02% boron, 0.3% impurities, and the balance aluminum.

The addition amount of the modifier in the step (1) is 0.8 percent of the total mass of the alloy; the modifier is added at a temperature corresponding to 755 ℃ in the furnace.

The modifier consists of the following components in parts by weight: 23 parts of strontium, 12 parts of chromium, 2 parts of yttrium and 6 parts of silver.

Controlling the temperature in the furnace to 765 ℃ during degassing in the step (1); and controlling the tapping temperature to be 730 ℃ during tapping.

And (3) controlling the casting temperature to be 705 ℃ and the casting pressure to be 0.23MPa during casting in the step (2).

And (3) controlling the ultrasonic frequency to be 770kHz during ultrasonic treatment in the step (2).

The heating treatment in the step (3) is specifically that the temperature is increased to 510 ℃ within 3.8h, and then the heat preservation treatment is carried out for 6h at the temperature.

The water quenching cooling treatment in the step (3) is to put the alloy into water quenching liquid for treatment for 7 min; the water quenching liquid consists of the following components in parts by weight: 5 parts of nano titanium carbide, 0.4 part of hexadecyl trimethyl ammonium bromide, 1.3 parts of sodium pyrophosphate, 1.5 parts of silane coupling agent and 280 parts of deionized water.

The artificial aging treatment in the step (4) is heat preservation treatment for 5.5 hours at the temperature of 150-160 ℃.

Example 3:

the casting process of the connecting cross rod of the treadmill handle comprises the following steps:

(1) alloy smelting treatment:

smelting the alloy, adding a modifier during the smelting, degassing and discharging for later use;

(2) pouring treatment:

carrying out die casting by adopting a low-pressure casting method, carrying out ultrasonic treatment during the die casting, and taking out and cooling for later use after the ultrasonic treatment is finished;

(3) and (3) heat treatment:

carrying out heating treatment, then carrying out water quenching cooling, and finally naturally cooling to room temperature for later use;

(4) aging treatment:

after the natural cooling is finished, man-hour effect processing is carried out on the people, polishing is carried out after the man-hour effect processing is finished, and the people can be obtained after the inspection is qualified.

The alloy in the step (1) comprises the following components in percentage by weight: 9.5% silicon, 0.2% iron, 0.5% magnesium, 0.3% copper, 0.7% manganese, 0.04% titanium, 0.03% boron, 0.4% impurities, and the balance aluminum.

The addition amount of the modifier in the step (1) is 1 percent of the total mass of the alloy; the modifier is added at a temperature corresponding to 760 ℃ in the furnace.

The modifier consists of the following components in parts by weight: 25 parts of strontium, 15 parts of chromium, 3 parts of yttrium and 8 parts of silver.

Controlling the temperature in the furnace to be 770 ℃ during degassing in the step (1); and controlling the tapping temperature to be 735 ℃ during tapping.

And (3) controlling the casting temperature to be 710 ℃ and controlling the pressure to be 0.25MPa during casting in the step (2).

And (3) controlling the ultrasonic frequency to be 800kHz during ultrasonic treatment in the step (2).

The heating treatment in the step (3) is specifically to heat the temperature to 520 ℃ within 4h, and then carry out heat preservation treatment for 7h at the temperature.

The water quenching cooling treatment in the step (3) is to put the alloy into water quenching liquid for 8 min; the water quenching liquid consists of the following components in parts by weight: 6 parts of nano titanium carbide, 0.5 part of hexadecyl trimethyl ammonium bromide, 1.5 parts of sodium pyrophosphate, 2 parts of silane coupling agent and 300 parts of deionized water.

The artificial aging treatment in the step (4) is heat preservation treatment for 6 hours at the temperature of 150-160 ℃.

Comparative example 1

This comparative example 1 is different from example 2 only in that yttrium, a component of the modifier, is omitted in step (1), and the process steps are the same except for this.

Comparative example 2

This comparative example 2 is compared with example 2 only with the difference that the modifier is omitted from step (1) except that the process steps are otherwise identical.

Comparative example 3

This comparative example 3 is different from example 2 only in that the water quenching liquid was replaced with ordinary clean water in the step (3), except that the other steps of the method were the same.

In order to compare the effects of the present invention, the handle connecting cross bar prepared in the above example 2, comparative example 1, comparative example 2, and comparative example 3 was subjected to a performance test, and the specific results are shown in the following table 1:

TABLE 1

Note: the tensile strength, yield strength and elongation at break described in table 1 above were all determined according to national standards; the average abrasion loss is measured by performing an abrasion experiment on the surface of the cross rod, the experiment specifically comprises the step of performing the abrasion experiment on the surface of the cross rod by using a disc-cutting abrasion tester, the load of the experiment is 80N, the rotating speed is 600 revolutions per minute, and the experiment time is 60 min; the acid resistance duration refers to the duration of the unchanged surface of the cross rod observed by soaking the cross rod in a sulfuric acid solution with the mass fraction of 5%, keeping the temperature at 35 ℃, and comparing the acid resistance characteristics.

As can be seen from table 1 above, the comprehensive quality of the handle connecting cross bar manufactured by the method of the present invention is significantly improved and enhanced, and compared with the conventional processing method, the method of the present invention has the advantages of product performance, and also has the characteristics of few processing procedures, and has great market competitiveness.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.