CN115846627A - Tool and method for casting double-sided anti-friction layer of guide plate of marine diesel engine - Google Patents

Abstract

The invention relates to a casting tool for a double-sided friction-reducing layer of a marine diesel engine guide plate, which comprises two bases with the same structure, two side baffles with the same shape; The two ends of the lower side of the baffle are respectively in contact with the upper surfaces of the two bases; the guide plate body requiring double-sided casting of the friction-reducing layer is sandwiched between the two side baffles; and two coolers under the bases are also included ; It also relates to a casting method for the double-sided friction-reducing layer of the marine diesel engine guide plate. It can cast the friction-reducing layer on both sides of the guide plate at the same time to realize sequential solidification; the operation control is simple, and the quality is stable and reliable.

Description

Tooling and method for casting double-sided friction-reducing layers of marine diesel engine guide plate

technical field

The invention relates to a marine diesel engine, in particular to a tooling and method for casting double-sided friction-reducing layers of a guide plate of a marine diesel engine.

Background technique

The marine diesel engine guide plate is an important component of the marine diesel engine. The guide plate is located in the crosshead slider mechanism of the low-speed diesel engine and is bolted to the slider. During the working process of the diesel engine, the cooperative slider bears the side thrust caused by the movement of the piston in the cylinder, and plays the role of limit and thrust. In order to ensure the reliable operation of the marine diesel engine, babbitt alloy anti-friction layers are provided on both sides of the guide plate of the marine diesel engine, and the babbitt alloy anti-friction layers are formed by casting. The traditional casting method is: after casting Babbitt alloy on the first side, then cast Babbitt alloy on the second side; Defects with unstable quality. Therefore, it is necessary to explore a new casting method and tooling.

Contents of the invention

The object of the present invention is to provide a casting tool for the anti-friction layer on both sides of the guide plate of the marine diesel engine, which can simultaneously cast the anti-friction layer on both sides of the guide plate to realize sequential solidification; and also provide the casting method of the anti-friction layer on both sides of the guide plate of the marine diesel engine , simple operation and control, stable and reliable quality.

The casting tooling for the double-sided friction-reducing layer of the marine diesel engine guide plate according to the present invention includes two bases with the same structure and two side baffles with the same shape, and is characterized in that: the two side baffles are arranged in parallel, The two ends of the lower sides of the two side baffles are respectively in contact with the upper surfaces of the two bases; the guide plate body that requires double-sided casting of the friction-reducing layer is sandwiched between the two side baffles; Cooler under the base.

Further, lugs are provided on both sides of the base, and each lug is provided with a bolt hole. The four bolts are respectively matched with the bolt holes on the four lugs, and the guide plate body that needs double-sided casting of the friction-reducing layer is clamped. between the two side fences.

Further, a through groove is provided under the base, and the cooler is arranged in the through groove; the distance between the upper surface of the cooler and the lower surface of the guide plate body requiring double-sided casting of the friction-reducing layer is 10 mm.

Further, the two ends of the guide plate body requiring double-sided casting of the friction-reducing layer are provided with process stops and grooves are provided on both sides.

A method for casting the anti-friction layer on both sides of the guide plate of the marine diesel engine according to the present invention is carried out on the above-mentioned casting tool for the anti-friction layer on both sides of the guide plate of the marine diesel engine, and is characterized in that it includes the following steps:

The first step is to process the process stopper; process the process stopper on both sides of the guide plate body, the thickness of the process stopper is 3mm, and the height is 6mm;

The second step is sandblasting; sandblasting the processed guide plate body to make the surface roughness reach Ra12.5;

The third step is to preheat tin enamel; preheat the body of the guide plate that has been sandblasted, the preheating temperature is 150°C, and then perform tin enamel treatment after preheating, the tin temperature is 280-300°C;

The fourth step is to fix the guide plate body; place the two side baffles on the base of the guide plate body to clamp the guide plate body and fasten them with bolts;

The fifth step is to install the cooler; place the cooler in the through groove under the base, and keep a distance of 10mm from the bottom of the guide plate body; connect the cooler to the cooling water pipe, and adjust the water pressure to 0.15MPa;

The sixth step is to cast the babbitt alloy; pour the molten babbitt alloy into the gate of the casting tool that has been clamped; after the babbitt alloy is cast, stir it once with a steel wire, and the stirring position is as deep as the bottom matrix;

The seventh step is to bake the surface with the flame; after the stirring is completed, use the oxyacetylene flame to bake the surface of the Babbitt alloy, and then stir while baking;

The eighth step is to cool the bottom of the guide plate body; after the surface baking is completed, open the cooling water valve, and the cooling water flows into the cooler to cool the bottom of the guide plate body. Babbitt alloy is completely solidified.

Beneficial effects of the present invention:

(1) The guide plate body is pretreated by wet sandblasting instead of the traditional pickling and alkali cleaning pretreatment method, which is environmentally friendly.

(2) Adopt the vertical casting method to cast the alloy on both sides at the same time, the process method is simple to control, and the quality is stable and reliable. The vertical casting method can directly cast the alloy on both sides at the same time, and at the same time, the cooling water is added to cool the matrix, which can realize the casting characteristics of sequential solidification of the matrix and the alloy. Solved the problem of poor combination of alloy and steel back in other casting methods.

(3) Bottom cooling and top heat preservation are adopted to realize the sequential solidification of the alloy and ensure the bonding quality and surface quality of the alloy.

(4) Ultrasonic testing is performed on the alloy after machining to detect the bonding quality of the alloy and the matrix, and penetrant testing is used for the surface quality of the Babbitt alloy. The pass rate of ultrasonic flaw detection is 100%, and the pass rate of penetrant flaw detection is over 90%.

Description of drawings

Fig. 1 is a schematic diagram of casting tooling of the present invention;

Fig. 2 is a structural schematic diagram of a guide plate of a marine diesel engine.

In the figure (the technical features indicated by the marks):

1—base, 11—ear, 12—through slot;

2—side baffle, 3—bolt, 4—cooler;

5—guide plate body, 51—block, 52—groove.

Detailed ways

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1 and Fig. 2, a casting tool for the double-sided friction-reducing layer of the guide plate of a marine diesel engine includes two bases 1 with the same structure and two side baffles 2 with the same shape, and is characterized in that: two side baffles The plates 2 are arranged in parallel, and the two ends of the lower sides of the two side baffles 2 are respectively in contact with the tops of the two bases 1; the guide plate body 5 requiring double-sided casting of the friction-reducing layer is sandwiched between the two side baffles 2; Two coolers 4 under the base 1 are provided. The cooler is made of φ21mm steel pipe, and a φ1.5mm through hole is drilled above the cooler with a hole spacing of 20mm.

The two sides of the base 1 are respectively provided with lugs 21, and each lug is provided with a bolt hole, and the four bolts 3 are respectively matched with the bolt holes on the four lugs, and the guide plate body 5 that needs double-sided casting of the friction-reducing layer is clamped. Between two side baffles 2.

A through groove 12 is provided under the base 1, and the cooler 4 is arranged in the through groove 12; the distance between the top of the cooler 4 and the bottom of the guide plate body 5 requiring double-sided casting of the friction-reducing layer is 10 mm.

Both ends of the guide plate body 5 requiring double-sided casting of the friction-reducing layer are provided with process stops 51 and grooves 52 are provided on both sides.

A method for casting the anti-friction layer on both sides of the guide plate of the marine diesel engine according to the present invention is carried out on the above-mentioned casting tool for the anti-friction layer on both sides of the guide plate of the marine diesel engine, and is characterized in that it includes the following steps:

The first step is to process the process block; process the process block 51 on both sides of the guide plate body 5, the thickness of the process block 51 is 3 mm, and the height is 6 mm (that is, the depth of the groove 52);

The second step is sand blasting treatment; the finished guide plate body 5 is sand blasted to make the surface roughness up to Ra12.5; wet sand blasting is used instead of the traditional pickling rust removal and alkali washing degreasing pre-treatment, The method is environmentally friendly and non-polluting; sandblasting abrasives are glass sand and black corundum, compressed air is 0.5MPa, and sandblasting pressure is 0.3MPa.

The third step is to preheat tin enamel; preheat the guide plate body 5 completed by sandblasting, the preheating temperature is 150°C, and then perform tin enamel treatment after preheating, the tin temperature is 280-300°C;

The fourth step is to fix the guide plate body; put the guide plate body 5 on the base 1, place two side baffles 2 on the base 1 to clamp the guide plate body 5, and fasten it with bolts 3;

The fifth step is to install the cooler; place the cooler 4 in the through groove 12 under the base 1, and keep a distance of 10mm from the bottom of the guide plate body 5; connect the cooler 4 to the cooling water pipe, and adjust the water pressure to 0.15MPa;

The sixth step is to cast the babbitt alloy; pour the molten babbitt alloy into the sprue of the clamped casting tool; after the babbitt alloy is cast, stir once with a steel wire, and the stirring position is as deep as the bottom matrix.

The vertical casting method can directly cast the alloy on both sides at the same time, and at the same time, the cooling water is added to cool the matrix, which can realize the casting characteristics of sequential solidification of the matrix and the alloy. Solved the problem of poor combination of alloy and steel back in other casting methods.

The seventh step is to bake the surface with the flame; after the stirring is completed, use the oxyacetylene flame to bake the surface of the Babbitt alloy, and then stir while baking;

The eighth step is to cool the bottom of the guide plate body; after the surface baking is completed, open the cooling water valve, and the cooling water flows into the cooler 4 to cool the bottom of the guide plate body 5, and at the same time, use the oxyacetylene reducing flame to keep the surface of the Babbitt alloy , until the babbitt alloy is completely solidified. The method of bottom cooling and top heat preservation is adopted to realize the sequential solidification of the alloy and ensure the bonding quality and surface quality of the alloy.

The casting tooling and method of the double-sided friction-reducing layer of the marine diesel engine guide plate are highly controllable and easy to adjust. Under the condition of the same structure, the size of the tooling can be adjusted to meet the casting production of Babbitt alloy of the guide plate body of various specifications.

Claims (5)

1. The utility model provides a two-sided antifriction layer's of marine diesel engine baffle casting frock, includes two base (1) that the structure is the same, two side shield (2) that the shape is the same, characterized by: the two side baffles (2) are arranged in parallel, and two ends of the lower edges of the two side baffles (2) are respectively contacted with the upper surfaces of the two bases (1); the guide plate body (5) needing double-sided casting of the anti-friction layer is clamped between the two side baffles (2); the cooling device also comprises two coolers (4) arranged below the base (1).

2. The casting tool for the double-sided anti-friction layer of the guide plate of the marine diesel engine according to claim 1, which is characterized in that: the two sides of the base (1) are respectively provided with a support lug (21), each support lug is provided with a bolt hole, four bolts (3) are respectively matched with the bolt holes in the four support lugs, and a guide plate body (5) needing double-sided casting of the anti-abrasion layer is clamped between the two side baffle plates (2).

3. The casting tool for the double-sided anti-friction layer of the guide plate of the marine diesel engine as claimed in claim 1 or 2, wherein the casting tool comprises: a through groove (12) is formed below the base (1), and the cooler (4) is arranged in the through groove (12); the distance between the upper surface of the cooler (4) and the lower surface of the guide plate body (5) needing the double-sided casting of the anti-friction layer is 10mm.

4. The casting tool for the double-sided anti-friction layer of the guide plate of the marine diesel engine as claimed in claim 1 or 2, wherein the casting tool comprises: the guide plate comprises a guide plate body (5) needing double-sided casting of an anti-friction layer, wherein two ends of the guide plate body (5) are provided with process stop blocks (51), and two sides of the guide plate body are provided with grooves (52).

5. A method for casting a double-sided wear-reducing layer of a guide plate for a marine diesel engine, which is performed on the casting tool for the double-sided wear-reducing layer of the guide plate for the marine diesel engine according to claim 3, wherein the casting tool comprises: the method comprises the following steps:

firstly, processing a technical stop block; processing technical stoppers (51) on two sides of the guide plate body (5), wherein the thickness of the technical stoppers (51) is 3mm, and the height of the technical stoppers is 6mm;

secondly, carrying out sand blasting treatment; performing sand blasting treatment on the machined guide plate body (5) to enable the surface roughness to reach Ra12.5;

thirdly, preheating tin coating; preheating the guide plate body (5) subjected to sand blasting at the preheating temperature of 150 ℃, and then carrying out tin coating treatment at the tin temperature of 280-300 ℃;

fourthly, fixing the guide plate body; placing two side baffles (2) on the upper surface of a base (1) of a guide plate body (5) to clamp the guide plate body (5) and fastening the guide plate body (5) by using bolts (3);

fifthly, installing a cooler; the cooler (4) is arranged in the through groove (12) below the base (1) and is spaced from the lower surface of the guide plate body (5) by 10mm; the cooler (4) is communicated with a cooling water pipe, and the water pressure is adjusted to 0.15MPa;

sixthly, casting babbitt metal; pouring the molten babbitt metal into a pouring gate of the clamped casting tool; after casting the babbitt metal, stirring once by adopting a steel wire, wherein the stirring position is deep to the bottom matrix;

seventhly, baking the surface by flame; after stirring, baking the surface of the babbitt alloy by using oxyacetylene flame, and stirring while baking;

eighthly, cooling the bottom of the guide plate body; and after the surface baking is finished, opening a cooling water valve, introducing cooling water into a cooler (4) to cool the bottom of the guide plate body (5), and simultaneously, preserving the heat of the surface of the babbit alloy by using oxyacetylene reducing flame until the babbit alloy is completely solidified.

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