阅读说明：本技术 一种新型材料压延辊恒温热磨工艺 (Novel material calendering roller constant-temperature hot grinding process ) 是由 蔡和义 于 2019-11-06 设计创作，主要内容包括：本发明提供了一种新型材料压延辊恒温热磨工艺,工艺步骤包括工艺准备,辊体整体预热,表面快速加热,喷液淬火和回火,该工艺对整体铸造压延辊处理工艺的创新,显著提高了整体压延辊的质量,不但满足了生产的需要,也提高了压延辊的使用寿命,塑胶压延辊外圆磨加工过程中把工件加温到客户使用温度在加工外圆,使产品在客户使用的时候不变形,精度高表面光洁度好。(The invention provides a novel constant-temperature hot grinding process for a material calendering roller, which comprises the process steps of process preparation, integral preheating of a roller body, rapid surface heating, liquid spraying quenching and tempering.)

1. A novel material calendering roller constant-temperature hot grinding process is characterized in that: the method comprises the following steps:

a. preparation of the process: after rough machining of the calendering roller, wrapping a roller neck with a heat-preservation and heat-insulation material asbestos fiber felt, pressing an armored thermocouple on a roller body, externally connecting a temperature control instrument, and hoisting the roller body to a trolley type resistance furnace support pad to be stable;

b. integrally preheating the roller body: heating the calendering roller by a resistance furnace in a segmented manner to 100-200 ℃, and keeping the temperature for 20 hours based on the temperature measurement of a roller body pressing armored thermocouple;

c. rapidly heating the surface of the roller body: the integrally preheated roller body is quickly taken out and placed into an open-close type fuel gas differential temperature furnace, the working layer of the roller body is quickly heated at the heating speed of 150-;

d. spray quenching: the quenching medium is liquefied gas obtained by atomizing water by compressed air, after heating and heat preservation in a differential temperature furnace are finished, the roller body is lifted to a spray quenching machine station for local quenching of the roller body, spray quenching is carried out for cooling to below 90 ℃, spraying is stopped, and then air cooling and air cooling are carried out, and the final cooling temperature is controlled to be 30-80 ℃;

e. tempering: air cooling, placing in a resistance furnace for tempering, removing the asbestos fiber felt wrapped by the roll neck before tempering, tempering at the temperature of 100-150 ℃, and keeping the temperature for 25-30 h.

2. The novel material calendering roller constant-temperature hot grinding process as claimed in claim 1, is characterized in that: the heating speed of the integral preheating of the roller body is 5-15 ℃/h.

3. The novel material calendering roller constant-temperature hot grinding process as claimed in claim 1 or 2, is characterized in that: the time for rapidly taking out and loading the whole preheated roller body into the open-close type gas differential temperature furnace is finished within 5-10min, and the temperature of the roller body is not lower than 150 ℃.

4. The novel material calendering roller constant-temperature hot grinding process as claimed in claim 3, is characterized in that: after the heating and heat preservation of the differential temperature furnace are finished, the roller body is lifted to a spray quenching machine station within 3-5min, the temperature of the roller body is not lower than 150 ℃, and the roller body is locally quenched.

Technical Field

The invention relates to the field of processing of calendering rolls, in particular to a constant-temperature hot grinding process for a novel material calendering roll.

Background

The calender is a basic device in rubber machinery and is mainly used for tabletting rubber materials, and the calender mainly comprises a roller, a roller bearing, a rack, a base, a distance adjusting mechanism, a temperature adjusting device, a control system, a lubricating system and a transmission device. At present, the heating pore channel is generally arranged at the center of the roller, the wall of the roller is thick, so that the uniformity of the surface temperature of the roller is poor when the roller works, sometimes the difference is 7-8 degrees, and the radian of a film is uneven.

The high-pressure roller grinding roller sleeve mainly bears huge normal extrusion force and larger tangential friction force in work, so that the roller surface is easily seriously abraded, and the quality of the roller sleeve directly influences the quality of the whole set of products. The special working conditions require that the roller sleeve has high hardness at a certain depth from the surface to ensure wear resistance, and other parts have good toughness, namely, the roller sleeve is hard outside and tough inside. At present, in order to achieve the treatment effect of external hardness and internal toughness, main means comprise tempering pretreatment, power frequency induction quenching, tempering pretreatment, differential temperature quenching, tempering pretreatment, carburizing quenching and the like, but all the methods need special matched equipment, and are expensive in manufacturing cost and various in working procedures.

Disclosure of Invention

The invention provides a novel material calendering roller constant-temperature hot grinding process. In order to solve the problems, in order to achieve the purpose, the invention adopts the following technical scheme:

a novel material calendering roller constant-temperature hot grinding process is carried out by adopting the following steps:

a. preparation of the process: after rough machining of the calendering roller, wrapping a roller neck with a heat-preservation and heat-insulation material asbestos fiber felt, pressing an armored thermocouple on a roller body, externally connecting a temperature control instrument, and hoisting the roller body to a trolley type resistance furnace support pad to be stable;

b. integrally preheating the roller body: heating the calendering roller by a resistance furnace in a segmented manner to 100-200 ℃, and keeping the temperature for 20 hours based on the temperature measurement of a roller body pressing armored thermocouple;

c. rapidly heating the surface of the roller body: the integrally preheated roller body is quickly taken out and placed into an open-close type fuel gas differential temperature furnace, the working layer of the roller body is quickly heated at the heating speed of 150-;

d. spray quenching: the quenching medium is liquefied gas obtained by atomizing water by compressed air, after heating and heat preservation in a differential temperature furnace are finished, the roller body is lifted to a spray quenching machine station for local quenching of the roller body, spray quenching is carried out for cooling to below 90 ℃, spraying is stopped, and then air cooling and air cooling are carried out, and the final cooling temperature is controlled to be 30-80 ℃;

e. tempering: air cooling, placing in a resistance furnace for tempering, removing the asbestos fiber felt wrapped by the roll neck before tempering, tempering at the temperature of 100-150 ℃, and keeping the temperature for 25-30 h.

Further, the heating speed of the integral preheating of the roller body is 5-15 ℃/h.

Furthermore, the time for rapidly taking out and loading the whole preheated roller body into the opening-closing type gas differential temperature furnace is finished within 5-10min, and the temperature of the roller body is not lower than 150 ℃.

Further, after the differential temperature furnace is heated and insulated, the roller body is lifted to a spray quenching machine station within 3-5min, the temperature of the roller body is not lower than 150 ℃, and the roller body is locally quenched.

The beneficial technical effects obtained by the invention are as follows:

the innovation of the casting calendering roller processing technology obviously improves the quality of the whole calendering roller, not only meets the production requirement, but also improves the service life of the calendering roller.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms described above will be understood by those of ordinary skill in the art according to the specific circumstances.

The process steps of the invention are as follows:

a. preparation of the process: after rough machining, the calendering roller is provided with a roller neck coated with heat-insulating material asbestos fiber felt, a roller body is provided with an armored thermocouple and an external temperature control instrument in a pressing mode, and the roller body is hoisted to a trolley type resistance furnace support pad to be stable and prevent deformation.

The function of the asbestos fiber felt of the heat-insulating material coated on the roll neck is to prevent the graphite form from being roughened due to overheating and overburning of the roll neck and reduce the strength of the roll neck.

b. Integrally preheating the roller body: heating the plastic roller body at 8-25 ℃/h by using a 300 ℃ resistance furnace

Heating in a speed sectional way, wherein the heating speed is 8 ℃/h when the temperature is between room temperature and 50 ℃, the heating speed is 20 ℃/h when the temperature is between 50 ℃ and 100 ℃, the heating temperature is 100 ℃, the temperature is maintained for 20h by taking the temperature measurement of a roller body pressing armored thermocouple as a standard.

The main function of the integral preheating of the roller body is to prepare for heating of the differential temperature furnace, reduce the temperature difference inside and outside the cross section of the roller body and avoid the crack or fracture of the roller body caused by the thermal stress formed by the overlarge temperature difference inside and outside the heating process of the differential temperature furnace.

c. Rapidly heating the surface of the roller body: preheating the differential temperature furnace to 150 ℃ in advance, and keeping the temperature for 20-30 min; preheating the whole

And (3) quickly taking out the subsequent roller body, putting the roller body into an open-close type gas differential temperature furnace, requiring 5-10min to finish, putting the roller body into the differential temperature furnace at the temperature of 150 ℃, quickly heating a working layer of the roller body at the heating speed of 150-. The roller body working layer is heated quickly, and only the whole supporting roller is heated and insulated by utilizing the characteristic of quick heating of the differential temperature furnace, so that the surface of the roller body reaches the temperature required by quenching, and the internal temperature of the roller body is still at a lower temperature, thereby reducing the heat storage capacity of the whole roller body and preparing for subsequent quenching.

According to one embodiment of the invention, the heating speed is 150 ℃/h, the temperature is raised to the heat preservation temperature, the heat preservation temperature is 250 ℃, and the heat preservation time is 90 min.

d. Spray quenching: the water pressure and the air pressure of the spray quenching machine are preset before quenching, the air pressure is 0.25-0.3MPa, and the water pressure is 0.1-0.2MPa, so as to ensure the atomization effect; the distance between the nozzle and the roller body is preset to be 700mm, and the center of the nozzle is slightly higher than the center line of the roller body by 15-25 mm; after the heating and heat preservation of the differential temperature furnace are finished, hoisting the roller body to a spray quenching and working position within 3-5min for local quenching of the roller body; measuring and recording the temperature every 5min in the spray quenching cooling process, and stopping spraying when the temperature of the roller body reaches 80 ℃; then air-cooling to 50 ℃ by an axial flow fan; stopping blowing, air cooling in static air, controlling final cooling temperature at 30 deg.C, measuring temperature every 15-20min, recording, and loading into resistance furnace for tempering.

e. Tempering: tempering (with a circulating fan) by using a 750 ℃ resistance furnace, removing the asbestos fiber felt wrapped by the roll neck before tempering, wherein the tempering temperature is determined according to the specific requirements of the hardness of the roll body and is generally 100-150 ℃, and cooling the furnace after the heat preservation time is 25-30 h.

One embodiment of the invention adopts a one-stage tempering process, wherein the first-stage tempering temperature is 100 ℃, and the holding time is 25 hours.

The tempering can eliminate the thermal stress and the transformation stress formed during the quenching to stabilize the quenching structure, so that the roll body structure is transformed into a bainite structure, and the roll neck and the core part of the roll body structure are a cable body and a pearlite structure.

Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples. Various configurations may omit, substitute, or add various procedures or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described, and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.

Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, e.g., well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.

It is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that it is the following claims, including all equivalents, that are intended to define the spirit and scope of this invention. The above examples are to be construed as merely illustrative and not limitative of the remainder of the disclosure. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.