CN108044033B

CN108044033B - Preparation method of milling drum, preparation method of milling machine and milling machine

Info

Publication number: CN108044033B
Application number: CN201711311586.3A
Authority: CN
Inventors: 张凯; 彭清莲; 卢晓兵
Original assignee: Hunan Sany Road Machinery Co Ltd
Current assignee: Hunan Sany Road Machinery Co Ltd
Priority date: 2017-12-06
Filing date: 2017-12-11
Publication date: 2020-01-07
Anticipated expiration: 2037-12-11
Also published as: CN108044033A

Abstract

The invention provides a preparation method of a milling drum, the milling drum, a preparation method of a milling machine and the milling machine, and belongs to the technical field of milling machines. The preparation method of the milling drum comprises the following modeling steps: manufacturing a sand mould by adopting molding sand and a sand core by adopting core-making sand, combining the sand core and a sand mould, forming a milling drum cavity between the sand mould and the sand core, and arranging a dead head and a pouring channel on the sand mould; pouring: selecting a steel raw material, putting the steel raw material into a smelting furnace for smelting, and pouring the molten liquid steel into a sand mold along a pouring channel; cleaning: and (3) cleaning the milling drum molded by casting from a sand mold, cutting a dead head, burrs and flashes, and polishing a bonded sand part. The method realizes the production of the milling drum through casting, does not need drum equipment or welding, greatly reduces the production cost, accelerates the production efficiency and has strong practicability.

Description

Preparation method of milling drum, preparation method of milling machine and milling machine

Technical Field

The invention relates to the technical field of milling machines, in particular to a milling drum preparation method, a milling drum, a milling machine preparation method and a milling machine.

Background

At present, the number of asphalt roads in China is rapidly increased, the traffic flow is also rapidly increased, after the asphalt roads are used for a period of time, the road surfaces are damaged in different degrees, partial or all maintenance needs to be carried out on the asphalt roads, and thus a milling machine needs to be used.

Milling machines usually comprise a milling drum, which essentially comprises a drum, a tool holder and tools mounted on the tool holder, and a feed belt. The blade holder is a plurality of, and a plurality of blade holders are fixed on the working face of cylinder and are the helix and arrange, and the helix that forms is many and interval arrangement, is equipped with at least one jettison gear between per two adjacent helices, and this jettison gear can directly throw the waste material that mills the mill and plane the production and deliver to the conveying belt, and the effectual waste material that prevents mills plane leaks outward, has avoided the secondary cleaning work on road surface, has improved work efficiency.

The inventor finds in research that at least the following disadvantages exist in the conventional milling drum production process:

the steel plate required by the milling drum roller is thick, and the requirement on drum equipment is high;

the welding process requirement at the roller joint is high.

Disclosure of Invention

The invention aims to provide a preparation method of a milling drum, which overcomes the defects of the prior art, can realize the production of the milling drum through casting without drum equipment or welding, greatly reduces the production cost, accelerates the production efficiency, and has strong practicability.

The invention also provides a milling drum, which is manufactured by the method and is suitable for most milling machines.

Another object of the present invention is to provide a method for producing a milling machine, which includes the above-mentioned method for producing a milling drum.

The invention also aims to provide a milling machine which is manufactured and formed by the preparation method of the milling machine.

The embodiment of the invention is realized by the following steps:

an embodiment of the present invention provides a method for preparing a milling drum, including:

molding: manufacturing a sand mold by adopting molding sand and a sand core by adopting core-making sand, combining the sand core and the sand mold, forming a milling drum cavity between the sand mold and the sand core, and arranging a riser and a pouring channel on the sand mold;

pouring: selecting a steel raw material, putting the steel raw material into a smelting furnace for smelting, and pouring the molten liquid steel into the sand mold along the pouring channel;

cleaning: and cleaning the milling drum molded by casting from the sand mold, cutting a dead head, burrs and flashes, and polishing a bonded sand part.

Specifically, the method realizes the production of the milling drum through casting, does not need to pass through a winding drum device, does not need to pass through welding, greatly reduces the production cost, accelerates the production efficiency, and has strong practicability.

Optionally, in the modeling step, a bottom shower type pouring system is adopted, and a connection position of the pouring channel and the milling drum cavity is located at the bottom of the milling drum cavity.

Optionally, the method further comprises a sand loading step:

and filling resin sand in the sand box, compacting, positioning the sand core, solidifying the resin sand to form a combination of the sand mold and the sand core, and forming the milling drum cavity in the combination.

Optionally, by mass, the liquid steel contains 0.21% -0.24% of carbon, 0.2% -0.4% of silicon, 1.0% -1.4% of manganese, 0.1% -0.3% of chromium, 0.01% -0.03% of niobium, 0.01% -0.025% of titanium, 0.0012% -0.002% of boron, less than or equal to 0.015% of phosphorus, less than or equal to 0.003% of sulfur, and the balance of iron.

Optionally, the pouring step comprises a charge preparation step and a charging step before the steel raw material is melted;

the step of preparing the furnace burden: calculating the mass fraction of each element in the steel raw material, and batching;

the charging step comprises: smelting by adopting a medium-frequency induction furnace, spraying a layer of flux on the bottom of the furnace, and immediately adding ferromanganese, ferrochrome and nickel into the furnace;

electrifying to melt the steel raw material, firstly supplying 50-70% of power to the electric furnace, gradually increasing the power to the maximum after the current fluctuation is stable, and continuously poking materials in the process of melting the steel raw material until the steel raw material is completely melted.

Optionally, the pouring step further includes a first adjusting step in the process of melting the steel raw material and a second adjusting step after the first adjusting step is finished;

the first adjusting step: adding ferromanganese and ferrosilicon into the smelting furnace for pre-deoxidation, carrying out sampling detection on the liquid steel in the smelting furnace, and carrying out component adjustment according to the sampling detection result;

the second adjusting step: and raising the temperature in the smelting furnace to 1580-1590 ℃, adding aluminum for final deoxidation, and pouring liquid steel into the sand mold after smelting.

Optionally, the sand core includes a drum module, a material throwing mechanism module and a tooth holder module, and the material throwing mechanism module and the tooth holder module are detachable with respect to the drum module.

The embodiment of the invention also provides a milling drum which is manufactured and formed by the preparation method of the milling drum.

Embodiments of the present invention also provide a method for manufacturing a milling machine, which includes the above-mentioned method for manufacturing a milling drum.

The embodiment of the invention also provides a milling machine which is manufactured and formed by the preparation method of the milling machine.

Compared with the prior art, the embodiment of the invention has the beneficial effects that:

in conclusion, the preparation method of the milling drum realizes the production of the milling drum through casting, does not need drum equipment or welding, greatly reduces the production cost, accelerates the production efficiency and has strong practicability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a sand mold provided in embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a milling drum casting provided in embodiment 1 of the present invention;

fig. 3 is an operation flowchart of a manufacturing method of a milling drum provided in embodiment 1 of the present invention;

FIG. 4 is a flowchart of the pouring step provided in example 1 of the present invention.

Icon: 100-milling drum casting; 101-a roller; 102-a material throwing mechanism; 103-a tooth holder; 201-a first riser; 202-a second riser; 203-straight pouring channel; 204-horizontal pouring channel; 205-ingate; 206-slag collection bag; 301-molding; 302-casting step; 303-cleaning; 304-charge preparation step; 305-a charging step; 306-a first adjustment step; 307-second adjustment step.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 1 to 4, the present embodiment provides a method for preparing a milling drum, including:

a modeling step 301: manufacturing a sand mould by adopting molding sand and a sand core by adopting core-making sand, combining the sand core and a sand mould, forming a milling drum cavity between the sand mould and the sand core, and arranging a dead head and a pouring channel on the sand mould;

a pouring step 302: selecting a steel raw material, putting the steel raw material into a smelting furnace for smelting, and pouring the molten liquid steel into a sand mold along a pouring channel;

a cleaning step 303: and (3) cleaning the milling drum molded by casting from a sand mold, cutting a dead head, burrs and flashes, and polishing a bonded sand part.

Generally, according to the characteristics of a milling drum, such as thin wall, cylinder shape, heavy weight and the like, self-hardening resin sand is selected to manufacture a sand mold.

In specific implementation, the method further comprises the following sand filling step: and filling resin sand in the sand box, compacting, positioning the sand core, and forming a combination of the sand mould and the sand core after the resin sand is solidified, wherein a milling drum cavity is formed inside the combination. And placing the manufactured sand box for pouring.

The final cleaning results in a milling drum casting 100, which, generally, can be subsequently machined to the fitting dimensions to form a milling drum finished product for installation on a milling machine.

The method realizes the production of the milling drum through casting, does not need drum equipment or welding, greatly reduces the production cost, accelerates the production efficiency and has strong practicability.

In this embodiment, the molding step 301 employs a bottom shower type pouring system, and the connection position of the pouring channel and the cavity of the milling drum is located at the bottom of the cavity of the milling drum.

The pouring channel comprises a sprue 203, a runner 204 and an ingate 205, the sprue 203 and the runner 204 are L-shaped, the runner 204 and the ingate 205 are also L-shaped, the number of the ingate 205 is multiple, and the liquid steel can uniformly enter a milling drum cavity after being poured.

The sprue 203 may be understood as a vertical runner and the cross runner 204 may be understood as a horizontal runner.

The slag trap 206 is disposed on the runner 204 to facilitate settling of slag. Through setting up first rising head 201 and second rising head 202, effectively prevent shrinkage cavity, shrinkage porosity, be favorable to the feeding. A first riser 201 is located relatively at the end of the sprue 203 and a second riser 202 is located relatively at the junction of the runner 204 and the ingate 205.

The bottom shower type pouring system is adopted, the mold filling is uniform and stable, the mold cavity does not rotate, and the adhesion of slag can be avoided.

Of course, in other embodiments, a general pouring manner may be selected as long as pouring can be achieved.

In the embodiment, by mass, the content of carbon in the liquid steel is 0.21% -0.24%, the content of silicon is 0.2% -0.4%, the content of manganese is 1.0% -1.4%, the content of chromium is 0.1% -0.3%, the content of niobium is 0.01% -0.03%, the content of titanium is 0.01% -0.025%, the content of boron is 0.0012% -0.002%, the content of phosphorus is less than or equal to 0.015%, the content of sulfur is less than or equal to 0.003%, and the balance of iron.

Specifically, the content of carbon may be 0.21%, 0.22%, 0.23%, 0.24%, etc., the content of silicon may be 0.2%, 0.3%, 0.4%, etc., the content of manganese may be 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, etc., the content of chromium may be 0.1%, 0.2%, 0.3%, etc., the content of niobium may be 0.01%, 0.02%, 0.03%, etc., the content of titanium may be 0.01%, 0.02%, 0.025%, etc., the content of boron may be 0.0012%, 0.0015%, 0.002%, etc., the content of phosphorus may be 0.015%, 0.013%, 0.01%, etc., the content of sulfur may be 0.003%, 0.0025%, 0.002%, etc. The balance being iron.

The service life of the cast finally formed by the composition is prolonged by 2.5 times compared with that of the existing Q345. It has remarkable wear resistance.

In this embodiment, the pouring step 302 includes a charge preparation step 304:

and calculating the mass fraction of each element in the steel raw material, and batching.

Generally, an approximate mass fraction is determined and compounded to form a mixture. The mass fraction corresponding to the element can refer to the content parameter.

In this embodiment, the pouring step 302 further includes a charging step 305 before the steel raw material is melted:

smelting by adopting a medium-frequency induction furnace, spraying a layer of flux on the bottom of the electric furnace, and immediately adding ferromanganese, ferrochrome and nickel into the electric furnace;

In the embodiment, an electric furnace is selected, the temperature is regulated and controlled through the power supply amount, generally, 60% of power is supplied firstly, the power is gradually increased after the current fluctuation is stable, and the material is continuously poked in the melting process to prevent the bridging phenomenon from occurring, and the furnace burden which is not completely loaded is added continuously until the furnace burden is completely melted.

Of course, in the embodiment, the electric energy is converted into the heat energy for melting, and in other embodiments, the chemical energy may be converted into the heat energy by burning coal, natural gas, or the like, as long as the ingredients can be melted.

In this embodiment, the pouring step 302 further includes a first adjusting step 306 during the melting of the steel raw material:

adding ferromanganese and ferrosilicon into the smelting furnace for pre-deoxidation, carrying out sampling detection on the liquid steel in the smelting furnace, and carrying out component adjustment according to the sampling detection result.

Generally, in the detection result, which element is absent, the compound corresponding to the element is correspondingly added, melting is continued, sampling detection is continued, and the next step can be performed until the proportion of the element in the component in the detection result meets the use requirement.

Of course, in other embodiments, if the ingredients to be melted and finally formed after the blending are satisfactory, the subsequent operations may be directly performed according to the ratio of the ingredients, so that the first adjusting step 306 may be omitted. Of course, the first adjustment step 306 is necessary to improve the quality of the product.

In this embodiment, the pouring step 302 further includes a second adjusting step 307 after the first adjusting step 306 is finished:

heating the furnace to 1580-1590 ℃, adding aluminum for final deoxidation, and pouring liquid steel into the sand mold after smelting.

The temperature can be 1580 deg.C, 1585 deg.C, 1590 deg.C, etc., and aluminum is added for final deoxidation. Through the operation, the purity of the liquid steel is further improved, and the quality of the product is further improved.

In this embodiment, the sand core includes a drum module, a material throwing mechanism module and a toothholder module, and the material throwing mechanism module and the toothholder module are detachable relative to the drum module.

The roller module correspondingly forms a roller 101, the material throwing mechanism module correspondingly forms a material throwing mechanism 102, and the toothholder module correspondingly forms a toothholder 103. In general, the drum 101, the throwing mechanism 102 and the tooth holder 103 form a milling drum casting 100. By locating the throwing mechanism module and the block module at different locations of the drum module, it is possible to form different milling drum castings 100, but the final formed milling drum casting 100, the three major components of which are integrally formed.

According to the preparation method of the milling drum provided by the embodiment of the invention, the principle of the preparation method of the milling drum is as follows:

the roller 101, the throwing mechanism 102 and the tooth holder 103 are integrally formed through casting, and the liquid steel consisting of new components is cast for forming, so that the wear resistance of the casting is improved.

The coiling block and the welding process are omitted, and the precise positioning of the material throwing mechanism 102 and the tooth holder 103 is realized through the modularized operation.

By the method, the production cost is effectively reduced, the production efficiency is improved, the product quality is improved, and the service life of the product is greatly prolonged.

Example 2

The embodiment provides a milling drum which is manufactured and formed by the preparation method.

The milling drum has better wear resistance, and compared with the prior art, the service life of the milling drum is greatly prolonged.

Through integrated into one piece's milling drum, its quality is higher, and the during operation is difficult to drop, has reduced the incidence of accident.

Example 3

The embodiment also provides a preparation method of the milling machine, which comprises the preparation method of the milling drum mentioned above.

The milling drum can be prepared by reference to example 1.

During the production process of the milling machine, the machine and the milling drum can be relatively independent, and the formed milling drum can be directly installed on the machine, so that the milling machine is formed.

Example 4

The embodiment provides a milling machine, which comprises the milling drum. Or it may be understood that it is manufactured and formed by the milling machine manufacturing method described above.

After the milling drum is formed in the cavity, the sand-sticking part is polished by cutting a dead head, burrs, flashes and the like to obtain a milling drum casting 100, and the milling drum casting is machined into a milling drum finished product which can be directly installed on a milling machine for use.

In conclusion, the invention provides the preparation method of the milling drum, the preparation method realizes the production of the milling drum through casting without drum equipment or welding, the production cost is greatly reduced, the production efficiency is accelerated, and the practicability is strong.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method of making a milling drum, comprising:

a molding step (301): manufacturing a sand mold by adopting molding sand and a sand core by adopting core-making sand, combining the sand core and the sand mold, forming a milling drum cavity between the sand mold and the sand core, and arranging a riser and a pouring channel on the sand mold;

pouring step (302): selecting a steel raw material, putting the steel raw material into a smelting furnace for smelting, and pouring the molten liquid steel into the sand mold along the pouring channel;

a cleaning step (303): cleaning the milling drum molded by casting from the sand mold, cutting a dead head, burrs and flashes, and polishing a bonded sand part;

the method also comprises the step of sand filling: filling resin sand in a sand box, compacting, positioning the sand core, and forming a combination of the sand mold and the sand core after the resin sand is solidified, wherein the milling drum cavity is formed inside the combination;

the sand core comprises a roller module, a material throwing mechanism module and a tooth holder module, wherein the material throwing mechanism module and the tooth holder module are detachable relative to the roller module.

2. The method for preparing a milling drum as claimed in claim 1, characterized in that in the shaping step (301) a bottom shower gating system is used, the connection point of the gate channel to the milling drum cavity being located at the bottom of the milling drum cavity.

3. The method for preparing the milling drum as claimed in claim 1, characterized in that, in mass percent, the liquid steel contains 0.21% to 0.24% of carbon, 0.2% to 0.4% of silicon, 1.0% to 1.4% of manganese, 0.1% to 0.3% of chromium, 0.01% to 0.03% of niobium, 0.01% to 0.025% of titanium, 0.0012% to 0.002% of boron, 0.015% or less of phosphorus, 0.003% or less of sulfur, and the balance of iron.

4. Method for preparing a milling drum according to any one of claims 1 to 3, characterised in that the pouring step (302) comprises a charge preparation step (304) and a charging step (305) before the steel raw material is melted;

-said charge preparation step (304): calculating the mass fraction of each element in the steel raw material, and batching;

the charging step (305): smelting by adopting a medium-frequency induction furnace, spraying a layer of flux on the bottom of the furnace, and immediately adding ferromanganese, ferrochrome and nickel into the furnace;

5. The milling drum preparation method according to any one of claims 1 to 3, characterized in that the pouring step (302) further comprises a first adjustment step (306) during the melting of the steel raw material and a second adjustment step (307) after the end of the first adjustment step (306);

the first adjusting step (306): adding ferromanganese and ferrosilicon into the smelting furnace for pre-deoxidation, carrying out sampling detection on the liquid steel in the smelting furnace, and carrying out component adjustment according to the sampling detection result;

the second adjusting step (307): and raising the temperature in the smelting furnace to 1580-1590 ℃, adding aluminum for final deoxidation, and pouring liquid steel into the sand mold after smelting.

6. Milling drum, characterized in that it is manufactured and shaped using the method for manufacturing a milling drum according to any one of claims 1-5.

7. Method for producing a milling machine, characterized in that it comprises a method for producing a milling drum according to any one of claims 1 to 5.

8. A milling machine, characterized in that the milling machine is manufactured and formed by the manufacturing method of the milling machine according to claim 7.