阅读说明：本技术 一种耐磨板加工工艺 (Machining process for wear-resisting plate ) 是由 杨晨 丁正龙 徐健 于 2021-06-16 设计创作，主要内容包括：本发明提供一种耐磨板加工工艺,其将常规的高铬铸铁铸件在加工完成之后,再增加一步锻造的程序,使其在锻压之后在不改变铸件整体大小的情况下,将铸件的一面锻造出一个凹槽,增加铸件本身的密度。本发明具有可极大的提高抛丸机用高铬铸铁耐磨板的机械性能,延长设备整机寿命等优点。(The invention provides a machining process of a wear-resisting plate, which is characterized in that after a conventional high-chromium cast iron casting is machined, a one-step forging procedure is added, so that one surface of the casting is forged into a groove under the condition that the whole size of the casting is not changed after forging, and the density of the casting is increased. The invention has the advantages of greatly improving the mechanical property of the high-chromium cast iron wear-resisting plate for the shot blasting machine, prolonging the service life of the whole equipment and the like.)

1. The machining process of the wear-resisting plate is characterized by comprising the following steps of:

s1, taking 2.0-3.3% of carbon, less than or equal to 1.5% of silicon, less than or equal to 2.0% of manganese, 11.00-14.00% of chromium, less than or equal to 3.0% of molybdenum, less than or equal to 2.5% of nickel, less than or equal to 1.2% of copper and the balance of iron as a manufacturing raw material for standby;

s2, removing impurities from the raw materials selected in S1, putting the raw materials into a hot melting device after the impurities are removed, starting the hot melting device, gradually melting the raw materials, and controlling a motor to start to rotate circularly after the melting is finished;

s3: taking out the liquid raw material subjected to S2 hot melting, pouring the liquid raw material into a mold to be poured, and obtaining a conventional cast iron casting after pouring;

s4: taking out the cooled casting, heating to 900-950 ℃, preserving heat for 1 hour after the temperature is reached to obtain a softened malleable casting, taking out the casting, placing the casting on a lower cutting board of forging equipment, and performing hot forging treatment on the softened casting by using an upper pressing punch of a forging press;

s5, forging the middle position of the casting to be concave by the upper pressing punch in the S4, and simultaneously keeping the whole size of the casting unchanged;

s6: placing the casting into a heat preservation furnace, heating, taking out of the furnace, and air cooling;

and S7, cooling to obtain the final formed casting product with the concave middle part.

2. The wear plate machining process of claim 1, wherein the top end and the side edges of the upper punch in the step S4 are arranged in an arc transition structure, and the bottom circle of the groove pressed by the upper punch in the middle of the casting is in a corresponding arc transition shape.

3. The wear plate machining process in accordance with claim 2, wherein the lower portion of the pressing punch in S4 is rectangular and the recess surface pressed out of the casting by the pressing punch is correspondingly rectangular.

4. The wear plate machining process of claim 3, wherein four sides of the recess are parallel to four sides of the casting, and the recess edge is spaced the same distance from the casting edge in each direction.

5. The wear plate machining process of claim 4, wherein the groove edge is spaced 10mm from the casting edge in each direction.

6. The machining process for the wear plate as claimed in claim 1, wherein in the step S6, the heat is preserved for 2-4 hours after the heat is preserved and the temperature is increased to 920-1000 ℃.

Technical Field

The invention relates to the field of shot blasting machines, in particular to a machining process of an abrasion-resistant plate.

Background

The wear-resistant plate of the shot blasting machine is mostly made of chromium alloy wear-resistant white cast iron, and the high-chromium cast iron is short for chromium alloy wear-resistant white cast iron (especially KmTBCr12) for the shot blasting machine and is a wear-resistant material with excellent performance and special attention. It has much higher wear resistance than alloy steel, much higher toughness and strength than common white cast iron, and simultaneously has good high temperature resistance and corrosion resistance, convenient production and moderate cost, and is known as one of the modern excellent wear-resistant materials.

However, the high-chromium cast iron wear-resistant plate of the existing shot blasting machine is thick on the surface of a casting and loose in cast state due to the influence of a casting process, and has high requirement on the surface flatness of the casting due to the large contact surface with a mounting wall plate when the shot blasting machine is mounted.

Therefore, there is a need to provide a new solution.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention discloses a wear-resisting plate machining process, which comprises the following specific technical scheme:

the invention provides a machining process of a wear-resisting plate, which comprises the following steps:

s1, taking 2.0-3.3% of carbon, less than or equal to 1.5% of silicon, less than or equal to 2.0% of manganese, 11.00-14.00% of chromium, less than or equal to 3.0% of molybdenum, less than or equal to 2.5% of nickel, less than or equal to 1.2% of copper and the balance of iron as a manufacturing raw material for standby;

s2, removing impurities from the raw materials selected in S1, putting the raw materials into a hot melting device after the impurities are removed, starting the hot melting device, gradually melting the raw materials, and controlling a motor to start to rotate circularly after the melting is finished;

s3: taking out the liquid raw material subjected to S2 hot melting, pouring the liquid raw material into a mold to be poured, and obtaining a conventional cast iron casting after pouring;

s4: taking out the cooled casting, heating to 900-950 ℃, preserving heat for 1 hour after the temperature is reached to obtain a softened malleable casting, taking out the casting, placing the casting on a lower cutting board of forging equipment, and performing hot forging treatment on the softened casting by using an upper pressing punch of a forging press;

s5, forging the middle position of the casting to be concave by the upper pressing punch in the S4, and simultaneously keeping the whole size of the casting unchanged;

s6: placing the casting into a heat preservation furnace, heating, taking out of the furnace, and air cooling;

and S7, cooling to obtain the final formed casting product with the concave middle part.

Further, the top end part and the side edge of the upper pressing punch in the step S4 are arranged to be in an arc transition structure, and the bottom circle of the groove pressed by the upper pressing punch in the middle of the casting is in a corresponding arc transition shape.

Further, the lower portion of the upper press punch in S4 is rectangular in shape, and the recessed surface of the casting pressed out by the upper press punch is correspondingly rectangular in shape.

Further, four sides of the groove are respectively parallel to four sides of the casting, and the distance between the edge of the groove and the edge of the casting in each direction is the same.

Further, the distance between the edge of the groove and the edge of the casting in each direction is 10 mm.

Further, in S6, the temperature is maintained for 2-4 hours after the furnace is heated to 920-1000 ℃.

The invention has the following beneficial effects:

1. according to the machining process of the wear-resisting plate, the adopted raw materials and the machining process in the early stage do not need to be changed, only one-step forging process is added in the later stage, one surface of the casting is forged into a groove under the condition that the whole size of the casting is not changed, and the density of the casting is increased.

2. According to the processing technology of the wear-resisting plate, the density of the casting is increased, the contact area between the casting and the installation wall plate is reduced, the mechanical performance of the high-chromium cast iron wear-resisting plate for the shot blasting machine can be greatly improved, and the service life of the whole equipment is prolonged.

3. The processing technology of the wear-resisting plate provided by the invention is simple in preparation technology and convenient for industrial production.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Detailed Description

In order to further illustrate the technical means adopted and the technical effects achieved by the present invention, the following detailed description is made with reference to the embodiments.

The invention provides a machining process of a wear-resisting plate, which comprises the following steps:

s1, taking 2.0-3.3% of carbon, less than or equal to 1.5% of silicon, less than or equal to 2.0% of manganese, 11.00-14.00% of chromium, less than or equal to 3.0% of molybdenum, less than or equal to 2.5% of nickel, less than or equal to 1.2% of copper and the balance of iron as a manufacturing raw material for standby;

s2, removing impurities from the raw materials selected in S1, putting the raw materials into a hot melting device after the impurities are removed, starting the hot melting device, gradually melting the raw materials, and controlling a motor to start to rotate circularly after the melting is finished;

s3: taking out the liquid raw material subjected to S2 hot melting, pouring the liquid raw material into a mold to be poured, and obtaining a conventional cast iron casting after pouring;

s4: taking out the cooled casting, heating to 900-950 ℃, preserving heat for 1 hour after the temperature is reached to obtain a softened malleable casting, taking out the casting, placing the casting on a lower cutting board of forging equipment, and performing hot forging treatment on the softened casting by using an upper pressing punch of a forging press;

s5, forging the middle position of the casting to be concave by the upper pressing punch in the S4, and simultaneously keeping the whole size of the casting unchanged;

s6: placing the casting into a heat preservation furnace, heating, taking out of the furnace, and air cooling;

and S7, cooling to obtain the final formed casting product with the concave middle part.

In one embodiment, the top end and the side edges of the upper pressing punch in the step S4 are arranged in an arc transition structure, and the bottom circle of the groove pressed by the upper pressing punch in the middle of the casting is a corresponding arc transition shape. Therefore, the material can be dispersed more uniformly when the upper pressing punch is used for extrusion, and the integral density distribution of the casting is also uniform.

In one embodiment, the lower portion of the upper punch in S4 has a rectangular shape, and the surface of the recess into which the casting is pressed by the upper punch has a corresponding rectangular shape. The shape of the recess corresponds to the shape of the casting, leaving an edge pitch for connection to the mounting panel. The four sides of the groove are respectively parallel to the four sides of the casting, and the distances between the edge of the groove in each direction and the edge of the casting are the same, so that the stress of the casting is more uniform.

In one embodiment, the groove edge is 10mm from the casting edge for each direction.

In one embodiment, in S6, the temperature is maintained for 2-4 hours after the furnace is heated to 920-1000 ℃.

According to the machining process of the wear-resisting plate, the adopted raw materials and the machining process in the early stage do not need to be changed, only one-step forging process is added in the later stage, one surface of the casting is forged into a groove under the condition that the whole size of the casting is not changed, and the density of the casting is changed. Because the density of the casting is increased, the contact area between the casting and the mounting wall plate is reduced, the mechanical property of the high-chromium cast iron wear-resisting plate for the shot blasting machine can be greatly improved, and the service life of the whole machine of the shot blasting machine is prolonged.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.

While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications and variations may be made therein by those of ordinary skill in the art within the scope of the present invention.