CN111318785A - A process for surfacing aluminum bronze on the inner surface of 27SiMn oil cylinder of coal mine liquid support - Google Patents

Abstract

A process for surfacing aluminum bronze on the inner surface of a 27SiMn oil cylinder of a coal mine liquid support relates to the technical field of welding. It includes the following steps: step 1, first evaluate the inner surface condition of the 27SiMn oil cylinder of the coal mine fluid support; step 2, removing accessories and removing rust and decontamination; step 3, boring the rust layer on the inner surface of the oil cylinder; step 4, using a diameter of 1 ‑1.5mm HK200 aluminum bronze welding wire is the welding material, which is welded on the inner surface of the cylinder except for the thread by a hot wire non-melting pole and inert gas shielded welding. After adopting the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: the scrapped or about to be scrapped hydraulic support 27SiMn oil cylinder is recovered, and the original use performance of the oil cylinder is restored by using this invention, so as to achieve the remanufacturing of the oil cylinder; the welding quality is stable, and the electroplating process is completely replaced , to achieve the effect of remanufacturing, greatly reduce the production cost, improve the production efficiency, and greatly improve the service life of the oil cylinder.

Description

A process for surfacing aluminum bronze on the inner surface of 27SiMn oil cylinder of coal mine liquid support

technical field

The invention relates to the technical field of welding, in particular to a process for surfacing aluminum bronze on the inner surface of a 27SiMn oil cylinder of a coal mine liquid support.

Background technique

During the working process of the sump of the hydraulic support, hard particles such as coal chips are easily accumulated on the mating surface of the column, causing scratches, and corrosive media such as moisture and hydrogen sulfide are easily mixed into the hydraulic oil, resulting in rust on the inner surface of the sump. , affecting the sealing effect, and ultimately causing the lifting force to drop. Currently, the electroplating process is used, and its disadvantages are: 1. This process is highly polluting to the environment and seriously carcinogenic to the body; 2. It is easy to fall off and affect the service life.

SUMMARY OF THE INVENTION

The object of the present invention is to aim at the defects and deficiencies of the prior art, to provide a process for surfacing aluminum bronze on the inner surface of the 27SiMn oil cylinder of the coal mine liquid support, to improve the service life of the oil cylinder, and to improve the production efficiency. The welding protection is good, the welding quality is stable, the labor intensity is greatly reduced, and the production efficiency is improved.

To achieve the above object, the present invention adopts the following technical solutions: it comprises the following steps:

Step 1, first evaluate the inner surface condition of the 27SiMn oil cylinder of the coal mine liquid support;

Step 2. Attachment removal and derusting and decontamination;

Step 3, boring the rust layer on the inner surface of the oil cylinder;

Step 4: Use HK200 aluminum bronze welding wire with a diameter of 1-1.5mm as the welding material, and weld the inner surface of the oil cylinder except the thread through a hot wire non-melting pole and inert gas shielded welding.

In the fourth step, the inert gas is high-purity argon.

In the fourth step, the welding current is 240-300A, the arc voltage is 29-30V, the hot wire current is 10A, the inert gas flow is 15-25L/min, and the welding speed is 0.35-0.4m/min.

(2)、平端面，修倒角；(3)、车两处架窝，保证架窝与内孔同轴度；(4)、粗车内止口，使尺寸达到均为D₁+1.5，D₂+1.5；(5)、熔铝青铜；(6)、精镗里孔尺寸；(7)、平端面；(8)、以里孔为基准，修两架窝；(9)、熔敷后的表面比较粗糙，半精车，精车内止口。An application of surfacing aluminum bronze technology on the inner surface of a 27SiMn oil cylinder of a coal mine liquid support, comprising the following steps: applying the surfacing aluminum bronze technology to a cylinder, and the process flow is: (1), the fine boring inner hole size reaches D +1.5 (+0.30～0),

(2), the flat end face, repair the chamfer; (3), the two frame sockets of the car, to ensure the coaxiality of the frame socket and the inner hole; (4), rough the inner stop of the car, so that the size is D ₁ +1.5 , D ₂ +1.5; (5), fused aluminum bronze; (6), fine boring inner hole size; (7), flat end face; (8), based on the inner hole, repair two bracket sockets; (9), The surface after cladding is relatively rough, semi-finished, and finished with inner stop.

The remanufacturing process of the molten aluminum bronze process is as follows: (1), boring the inner hole, and the inner hole is seriously corroded; (2), turning the mouth; (3), melting copper; (4), boring the inner hole of the car hole, stop.

The purity of the pure argon is 99.995%.

After adopting the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: the scrapped or about to be scrapped hydraulic support 27SiMn oil cylinder is recovered, and the original performance of the oil cylinder is restored by using this invention, thereby achieving the remanufacturing of the oil cylinder; by adopting inert gas shielded welding, welding protection Good, no spatter, stable welding quality, completely replace the electroplating process, achieve the effect of remanufacturing, greatly reduce the production cost, improve the production efficiency, and greatly improve the service life of the oil cylinder.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic diagram of a cylinder according to an embodiment of the present invention.

Detailed ways

The technical solutions adopted are:

Example 1: The oil cylinder in the hydraulic support column of the coal mine is made of 27SiMn, and the steel is surfacing aluminum bronze on its inner surface, and the technical level of the copper layer surfacing is required to be very important for the internal quality of the copper layer and the bonding performance of the steel matrix. Due to the high carbon content of 27SiMn, the content of alloying elements is also high. Therefore, the main problems of welding are to avoid welding cracks, reduce the hardenability of the heat affected zone, reduce the diffusible hydrogen content before welding, and reduce the binding force of the welding zone.

The 27SiMn oil-steel cylinder inner wall is used for surfacing aluminum bronze. The process is as follows: the welding method is hot wire non-melting polar inert gas shielded welding, and the welding material is HK200 aluminum bronze welding wire with direct 1.2mm, of which the hot wire non-melting electrode is used. The shielding gas used in the inert gas shielded welding is high-purity argon, and the purity of the pure argon is 99.995%.

The welding process parameters are as follows:

Using hot wire tungsten argon arc welding, the welding protection is good, the welding quality is stable, the labor intensity is greatly reduced, and the production efficiency is improved.

2、平端面，修倒角；3、车两处架窝，保证架窝与内孔同轴度；4、粗车内止口，使尺寸达到均为D₁+1.5，D₂+1.5；5、熔铝青铜；6、精镗里孔尺寸；7、平端面；8、以里孔为基准，修两架窝；9、熔敷后的表面比较粗糙，半精车，精车内止口。Referring to Fig. 1, Example 2: The copper melting process in the inner hole of the cylinder tube. On the basis of the original cylinder tube process, according to the thickness of the deposited layer, the size of the inner hole is enlarged by fine boring, and then the inner hole is welded. Aluminum bronze, and then finish machining, and finally reach the size and meet the requirements; taking a cylinder tube as an example, the process flow is as follows: 1. The inner hole size of fine boring reaches D+1.5 (+0.30～0),

2. Flat end face, repair chamfer; 3. Two frame sockets on the car to ensure the coaxiality between the frame socket and the inner hole; 4. Thicken the inner stop of the car, so that the dimensions are both D ₁ +1.5, D ₂ +1.5; 5. Fused aluminum bronze; 6. Fine boring inner hole size; 7. Flat end face; 8. Based on the inner hole, repair two nests; mouth.

It can be applied in remanufacturing and repairing. The remanufacturing repair of the sealing surface of the inner surface of the cylinder due to corrosion and strain is carried out by using the deposited aluminum bronze process, and good results have been achieved. The molten aluminum bronze process is a remanufacturing process. The process is as follows: 1. Boring the inner hole, the inner hole is seriously corroded; 2. Turning the mouth; 3. Melting copper; 4. Boring the inner hole and the mouth of the car.

The process can deal with scrapped cylinders with a depth of less than 1mm due to inner hole wear, strain, rust, etc. After dimensional repair and strengthening treatment, the original dimensional accuracy is restored, and the comprehensive mechanical strength of the cylinder is maintained or slightly higher than the original value.

Clad aluminum bronze in the inner hole of the cylinder wall can greatly improve the service life of the cylinder, especially in the overhaul, it can effectively shorten the overhaul cycle, and has the advantages of low consumption, high quality and high efficiency.

Embodiment 3: Take a kind of cylinder tube as an example, the cost and time comparison of the newly manufactured product and the repair of a cylinder tube using the inner hole melting copper technology:

1. New manufacturing process: preparation, turning, welding, heating, turning, boring, etc.;

2. The cost and time required for the two are compared as shown in the table below;

Through calculation, it can be concluded that repairing the cylinder tube by the molten copper process saves 1042.48 yuan compared with the new manufacturing of one cylinder tube. The time-consuming is 2.3 times that of repairing one root. It can be seen from the above table that the rational use of the new copper melting process can effectively shorten the overhaul period, and the overall quality of the product can also be greatly improved. For some oil cylinders with thick walls that occupy most of the cost, when the inner hole is seriously rusted, It can be considered to adopt the repairing process of cladding aluminum bronze in the inner hole. The performance index of the oil cylinder repaired by this process is even better than that of the new product, which can create huge social and economic benefits and has a wide range of application prospects.

After adopting the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: the scrapped or about to be scrapped hydraulic support 27SiMn oil cylinder is recovered, and the original performance of the oil cylinder is restored by using this invention, thereby achieving the remanufacturing of the oil cylinder; by adopting inert gas shielded welding, welding protection Good, no spatter, stable welding quality, completely replace the electroplating process, achieve the effect of remanufacturing, greatly reduce the production cost, improve the production efficiency, and greatly improve the service life of the oil cylinder.

The above is only used to illustrate the technical solution of the present invention and not to limit it. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be Included within the scope of the claims of the present invention.

Claims (6)

1. a technique for surfacing aluminum bronze on the inner surface of coal mine liquid support 27SiMn oil cylinder, is characterized in that, it comprises the following steps: Step 1, first evaluate the inner surface condition of the 27SiMn oil cylinder of the coal mine liquid support; Step 2. Attachment removal and derusting and decontamination; Step 3, boring the rust layer on the inner surface of the oil cylinder; Step 4: Use HK200 aluminum bronze welding wire with a diameter of 1-1.5mm as the welding material, and weld the inner surface of the oil cylinder except the thread through a hot wire non-melting pole and inert gas shielded welding. 2. A process for surfacing aluminum bronze on the inner surface of a coal mine liquid support 27SiMn oil cylinder according to claim 1, characterized in that: in the step 4, the inert gas is high-purity argon. 3. a kind of technology of surfacing aluminum bronze on the inner surface of coal mine liquid support 27SiMn oil cylinder according to claim 1, is characterized in that: in described step 4, welding current is 240～300A, arc voltage is 29-30V, heat The wire current is 10A, the inert gas flow is 15-25L/min, and the welding speed is 0.35-0.4m/min. 4. an application of surfacing aluminum bronze technology on the inner surface of the coal mine liquid support 27SiMn oil cylinder, it is characterized in that, it comprises the following steps: the surfacing aluminum bronze technology is applied to the cylinder, and its technological process is: (1), precise The size of the boring inner hole reaches D+1.5 (+0.30～0),

(2), the flat end face, repair the chamfer; (3), the two frame sockets of the car, to ensure the coaxiality of the frame socket and the inner hole; (4), rough the inner stop of the car, so that the size is D ₁ +1.5 , D ₂ +1.5; (5), fused aluminum bronze; (6), fine boring inner hole size; (7), flat end face; (8), based on the inner hole, repair two bracket sockets; (9), The surface after cladding is relatively rough, semi-finished, and finished with inner stop. 5. a kind of application of surfacing aluminum bronze technique in coal mine liquid support 27SiMn oil cylinder inner surface according to claim 4, is characterized in that: described molten aluminum bronze technique is as follows in remanufacturing process flow: (1), boring If the inner hole is cut, the inner hole is seriously corroded; (2), turning the mouth; (3), melting copper; (4), boring the inner hole and the mouth of the car. 6 . The process for surfacing aluminum bronze on the inner surface of a coal mine liquid support 27SiMn oil cylinder according to claim 2 , wherein the purity of the pure argon is 99.995%. 7 .

Images