CN112406129B - Production method and production system of rubber part - Google Patents
Production method and production system of rubber part Download PDFInfo
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- CN112406129B CN112406129B CN202011179337.5A CN202011179337A CN112406129B CN 112406129 B CN112406129 B CN 112406129B CN 202011179337 A CN202011179337 A CN 202011179337A CN 112406129 B CN112406129 B CN 112406129B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
Abstract
The invention provides a production method and a production system of a rubber part, wherein the production method comprises the following steps: 1) cutting the molding rubber strip after constant temperature treatment to obtain an operation rubber strip with the length of L; 2) carrying out mould pressing treatment on the operation rubber strip and then carrying out low-temperature treatment on the operation rubber strip to obtain the rubber piece; the temperature of the constant temperature treatment is below 50 ℃, and the time of the constant temperature treatment is not less than 4 h; the low-temperature treatment temperature is below 5 ℃, and the low-temperature treatment time is not less than 4 h. According to the method, the influence of instability of raw materials and environment on the dimensional stability of the rubber part is reduced by controlling the processing temperature and the cutting size of the rubber part in the forming process, the dimensional accuracy of the rubber part is improved with low investment, and the dimensional deviation between the actual size of the rubber part and the target rubber part is reduced.
Description
Technical Field
The invention relates to a production method and a production system of a rubber part, and belongs to the field of production of rubber products.
Background
In the manufacturing process of the rubber part, the raw materials are required to be mixed firstly, and then the rubber part is obtained through vulcanization, so that the original linear molecular chain is converted into a three-dimensional cross-linked network, and the rubber part has excellent physical and chemical properties. Due to the excellent physical and chemical properties of the rubber, the rubber products are more and more widely applied in daily production and life. Generally, the rubber member is used in combination with other elements, and taking the rubber sealing member as an example, only when the rubber sealing member and the functional member used in combination with the rubber sealing member have adaptability, the rubber sealing member is beneficial to exerting excellent physical and chemical properties of the rubber sealing member.
In most rubber part production processes, rubber parts meeting the size requirements are produced according to the specific size of the rubber parts in a specific application environment as a control parameter. However, due to the difference of raw material batches, the physical property change of the rubber material in the molding and vulcanizing process is easily inconsistent, so that the sizes of the rubber pieces produced in different batches are different, and the actual sizes of the rubber pieces in each batch are different from the target sizes of the rubber pieces to different degrees. In addition, environmental changes and seasonal changes in the production process also affect the dimensional error of the rubber piece in accurate control. The dimensional deviation caused by the above reasons often limits the competitiveness of related enterprises in terms of production of rubber products, especially precision rubber products, and affects the production efficiency and benefit of enterprises.
In the prior art, for the size of accurate control rubber spare, often control on a large scale with production equipment in the rubber production line, each factor such as production environment, producers, this leads to manufacturing cost's increase by a wide margin undoubtedly to the control effect is also as far as possible.
Disclosure of Invention
The invention provides a production method of a rubber part, which reduces the influence of instability of raw materials and environment on the dimensional stability of the rubber part by controlling the processing temperature and the cutting size of the rubber part in the forming process, improves the dimensional accuracy of the rubber part with low investment, and reduces the dimensional deviation between the actual size of the rubber part and a target rubber part.
The invention also provides a production system of the rubber part, which is beneficial to producing the rubber part meeting the size requirement.
The invention provides a production method of a rubber part, which comprises the following steps:
1) cutting the molding rubber strip after constant temperature treatment to obtain an operation rubber strip with the length of L;
2) carrying out mould pressing treatment on the operation rubber strip, and then sequentially carrying out low-temperature treatment and normal-temperature treatment to obtain the rubber piece;
the temperature of the constant temperature treatment is below 50 ℃, and the time of the constant temperature treatment is not less than 4 h;
the low-temperature treatment temperature is below 5 ℃, and the low-temperature treatment time is not less than 4 h;
the temperature of the normal-temperature treatment is 21-25 ℃, and the time of the normal-temperature treatment is 12-36 h;
wherein the cutting process is performed according to equation 1,
in the formula 1, L0The size of the target rubber part, x is the linear expansion coefficient and T of the rubber part subjected to the preset temperature treatment in the production process of the rubber part1Temperature, T, for the embossing treatment2Is the temperature of normal temperature treatment.
The production method of the rubber part, wherein after the normal temperature treatment, the method further comprises: carrying out high-temperature treatment on the rubber piece treated at the normal temperature to obtain the rubber piece; the high-temperature treatment temperature is above 100 ℃, and the high-temperature treatment time is not less than 4 h.
The production method of the rubber part is characterized in that the high-temperature treatment is carried out at 100-230 ℃ for 4-24 hours.
The production method of the rubber part is characterized in that the constant temperature treatment is carried out at the temperature of 0-50 ℃ for 4-24 hours.
The production method of the rubber part is characterized in that the low-temperature treatment is carried out at-200-5 ℃ for 4-24 hours.
The method for producing a rubber member as described above, wherein the time interval between the molding treatment and the low-temperature treatment is not more than 5 min.
The method for producing a rubber member as described above, wherein the time interval between the cutting process and the molding process does not exceed 30 min.
The method for producing a rubber member as described above, wherein the total side length of the cross section of the shaped rubber strip is M,
in formula 2, M0The total side length of the cross section of the target rubber part, the linear expansion coefficient of the rubber part subjected to temperature treatment in the production process of the x rubber part, and the T1Temperature, T, for the embossing treatment2Is the temperature of normal temperature treatment.
The present invention also provides a production system for carrying out the production method of a rubber member described in any one of the above, including:
the device comprises a constant temperature processing device, a cutting processing device, a mould pressing processing device, a low temperature processing device and a normal temperature processing device which are connected in sequence.
The production system of the rubber part further comprises a high-temperature treatment device connected with the normal-temperature treatment device.
According to the production method of the rubber part, the specific temperature treatment and the cutting treatment are assisted in the rubber part forming process, the improvement of the internal molecular structure of the rubber part intermediate is combined with the more accurate cutting size, the negative influence of unstable factors (such as difference caused by different raw material batches and difference caused by different production seasons or environments) in the production process on the size of the rubber part during production is reduced, the deviation between the production size of the rubber part and the size of a target rubber part is reduced, and the size precision of the rubber part is remarkably improved.
In addition, the production method of the rubber part is simple and easy to implement, does not need large-scale instruments for assistance, and can be compatible with the existing production process of the rubber part, so that the rubber part is convenient to popularize in a large range on industrial application.
The production system of the rubber part is beneficial to producing and obtaining the rubber part with higher dimensional accuracy, has simple composition and small occupied area, and can be more compatible with the production system of the rubber part at the present stage, thereby having great industrial application value.
Drawings
FIG. 1 is a schematic view of the structure of a rubber production system in example 1 of the present invention;
FIG. 2 is a schematic view showing still another structure of a rubber production system in example 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages 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 embodiments of the present 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.
The invention provides a production method of a rubber part, which comprises the following steps:
s101: cutting the molding rubber strip after constant temperature treatment to obtain an operation rubber strip with the length of L;
wherein the temperature of constant temperature treatment is below 50 ℃, and the time of constant temperature treatment is not less than 4 h;
wherein the cutting process is performed according to equation 1,
in the formula 1, L0The size of the target rubber part, x is the linear expansion coefficient and T of the rubber part subjected to the preset temperature treatment in the production process of the rubber part1Temperature, T, for the embossing treatment2Is the temperature of normal temperature treatment.
S102: carrying out mould pressing treatment on the operation rubber strip, and then sequentially carrying out low-temperature treatment and normal-temperature treatment to obtain the rubber piece;
wherein the low-temperature treatment temperature is below 5 ℃, and the low-temperature treatment time is not less than 4 h;
the temperature of the normal-temperature treatment is 21-25 ℃, and the time of the normal-temperature treatment is 12-36 h.
The kind of the rubber member is not particularly limited, and may be, for example, ethylene propylene diene monomer rubber or nitrile rubber.
The formed rubber strip is an intermediate product obtained by taking rubber production raw materials as a starting material and performing mixing treatment and rubber strip forming treatment on the raw materials in the production process of the rubber piece.
According to the production method of the rubber part, the formed rubber strip is taken as a processing object, and after the rubber strip is formed and processed sequentially at constant temperature, cutting, mould pressing, low temperature and normal temperature, the rubber part with good dimensional accuracy is obtained, and the dimensional deviation with a target rubber part is reduced.
Specifically, in S101, after the molding rubber strip is subjected to constant temperature treatment at 50 ℃ or lower for at least 4 hours, the molding rubber strip after the constant temperature treatment is subjected to cutting treatment according to formula 1, and the working rubber strip with the size L is obtained. The dimensions here generally refer to the length of the operating bead.
In S101, the constant temperature treatment as a treatment step before the cutting treatment can improve the molecular cross-linking state inside the formed rubber strip, so that the formed rubber strip to be subjected to the cutting treatment has certain structural stability, thereby contributing to the improvement of the precision of the rubber member. In one embodiment, the constant temperature treatment is carried out at 0-50 ℃ for 4-24 h.
In formula 1, L is the length of the working tape (the unit may be a length unit such as mm or cm), and L is0Is the length (unit is consistent with that of L) of the target rubber part, x is the linear expansion coefficient of the rubber part after the preset temperature treatment in the production process of the rubber part, and T is1Temperature in ℃, T for the embossing treatment2The temperature (unit is) for normal temperature treatment.
And (4) performing preset temperature treatment, namely performing temperature treatment of the last step in the production process of the rubber piece. Taking nitrile rubber raw material as raw material to produce rubber parts as an example, the raw material is subjected to raw material mixing treatment, constant temperature treatment, mold pressing treatment, low temperature treatment and normal temperature treatment in sequence in the production process to obtain the nitrile rubber parts, and the preset temperature treatment is normal temperature treatment. And x is the linear expansion coefficient of the rubber part treated at the normal temperature in the production process of the rubber part.
The method for acquiring the linear expansion coefficient x of the rubber part subjected to the preset temperature treatment comprises the following steps: taking part of raw materials, sequentially carrying out raw material mixing treatment, constant temperature treatment, mould pressing treatment, low temperature treatment and normal temperature treatment (preset temperature treatment) to obtain a standard test rubber sheet, and detecting the linear expansion coefficient of the standard test rubber sheet. Wherein, the processing parameters of the above treatments are consistent with the corresponding processing parameters in the production process of the rubber piece.
As can be seen from equation 1, equation 1 for controlling the cutting process according to the present invention relates to the expansion coefficient after the molding process and the temperature-dependent process performed after the cutting process, and therefore the cut-out process rubber strip according to equation 1 can have more excellent performance at least in the molding process and the temperature-dependent process, for example, has stability of the holding length L.
The size and the shape of the produced rubber piece are closer to those of the target rubber piece, the higher the size precision of the produced rubber piece is, and the more the production requirement is met.
It should be noted that, when the target rubber member is linear, L is0Is the linear length of the target rubber piece; when the target rubber member is curved, L0The length of the straight line of the target rubber part after being straightened is obtained; when the target rubber member is in a ring shape, L0The perimeter of the target rubber part; when the target rubber part is in a polygonal ring shape, L is0Is the sum of the respective side lengths of the target rubber member. Thus, a working bead of length L obtained by cutting according to equation 1 is moldedAnd (3) performing pressure treatment, low-temperature treatment and normal-temperature treatment to obtain the rubber part meeting the production requirement.
Except the situation, when the target rubber part is in a polygonal ring shape, the operation rubber strips with the lengths of multiple sections being L can be obtained by cutting according to the formula 1, and the multiple sections of rubber strips are subjected to low-temperature treatment after being subjected to mould pressing together, so that the rubber part meeting the production requirement is obtained. For example, when the target rubber member has a rectangular ring shape, the length of each of the four sides of the target rubber member may be L0Cut to four L's according to equation 10The four sections of operation rubber strips with the length of L respectively correspond to each other, and the rubber part meeting the production requirement is obtained by carrying out mould pressing treatment, low-temperature treatment and normal-temperature treatment on the four sections of operation rubber strips with the length of L. In S102, the molding process is substantially the same as the molding process in the present state of the art, and the rubber member having substantially the same shape and the same size as the target rubber member is obtained by heat-molding the working rubber strip having the size L. And then, standing the rubber piece obtained through mould pressing treatment at the temperature of below 5 ℃ for not less than 4 hours, and then carrying out normal-temperature treatment at the temperature of 21-25 ℃ for 12-36 hours to prepare the rubber piece. The temperature of the molding process is determined according to the selection of the raw material.
At present, the rubber part is obtained through a natural cooling mode after the mould pressing treatment, however, the heat transfer in the rubber part after the mould pressing treatment is slow, the residual heat can further vulcanize the inside of the rubber part, the internal partial chain structure is also easily influenced by the residual high temperature, the influence of the residual heat is also easily influenced by the external environment during the natural cooling, and the influence on the size of the rubber part is particularly obvious. Therefore, the invention carries out low-temperature treatment below 5 ℃ on the operation rubber strip after the operation rubber strip is subjected to mould pressing treatment, relatively naturally cools the operation rubber strip, can quickly transfer the residual heat after the operation rubber strip is subjected to mould pressing treatment, reduces the uncontrollable vulcanization and the change of rubber molecular chains after the mould pressing treatment is finished, and improves the dimensional precision of the rubber part.
According to the production method of the rubber part, the dimensional accuracy of the rubber part is improved by controlling the temperature and the cutting size in the production process of the rubber part, the negative influence of various possible unstable factors on the size of the rubber part in the production process is corrected, excessive complex parameter control is not needed, the production process of the existing rubber part can be compatible, and therefore the production method of the rubber part can be popularized in a large scale in industrial application.
Further, after the normal temperature treatment, the rubber material after the normal temperature treatment is subjected to a high temperature treatment, whereby a rubber material having more excellent dimensional accuracy can be obtained. Wherein the high-temperature treatment temperature is above 100 ℃, and the high-temperature treatment time is not less than 4 h.
Specifically, the rubber part is placed in a high-temperature environment with the temperature of more than 100 ℃ for at least 4 hours and then taken out, and the temperature is naturally reduced to room temperature, so that the rubber part is obtained.
When the high-temperature treatment is further included after the normal-temperature treatment, x in formula 1 is different from x in the foregoing method. Taking ethylene propylene diene monomer raw material as raw material for producing rubber parts as an example, the raw material is subjected to raw material mixing treatment, constant temperature treatment, mold pressing treatment, low temperature treatment, normal temperature treatment and high temperature treatment in sequence during production to obtain the rubber parts, and the preset temperature treatment is high temperature treatment. Namely x is the linear expansion coefficient of the rubber part after high-temperature treatment in the production process of the rubber part. In the present embodiment, the method for obtaining the linear expansion coefficient x includes: taking part of raw materials, sequentially carrying out raw material mixing treatment, constant temperature treatment, mould pressing treatment, low temperature treatment, normal temperature treatment and high temperature treatment (preset temperature treatment) to obtain a standard test rubber sheet, and detecting the linear expansion coefficient of the standard test rubber sheet. Wherein, the processing parameters of the above treatments are consistent with the corresponding processing parameters in the production process of the rubber piece.
In the embodiment, the rubber piece after normal temperature treatment is subjected to high temperature treatment, and the treatment mode adjusts the cross-linking state and the internal stress of the molecular internal structure of the rubber piece again, so that the dimensional stability of the rubber piece is further improved
The present invention is not limited to the specific environments of low-temperature treatment, normal-temperature treatment, and high-temperature treatment, and for example, the environment of low-temperature treatment may be realized by using a refrigeration device or a low-temperature medium, and the environment of normal-temperature and high-temperature treatment may be realized by using an oven.
In the research process, the inventor finds that when the low-temperature treatment temperature is-20-5 ℃ and the time is 4-12 hours, and/or the high-temperature treatment temperature is 100-230 ℃ and the time is 4-12 hours, the conversion of various rubber raw materials to high-precision rubber parts can be basically realized with lower energy consumption.
In the present invention, the time interval between the compression treatment and the low-temperature treatment may be controlled so that the obtained rubber material can rapidly release the residual heat at a low temperature. The inventor finds that the time interval between the molding treatment and the low-temperature treatment affects the size of the rubber member, and the smaller the time interval, the more favorable the dimensional accuracy of the rubber member, so that the low-temperature treatment can be performed quickly after the molding treatment, and in one embodiment, the time interval between the molding treatment and the low-temperature treatment is not more than 5 min.
Similarly, in order to reduce the influence of the external environment on the size of the rubber part, the die pressing treatment can be rapidly carried out after the operation rubber strip is obtained through the cutting treatment, and in one embodiment, the time interval between the cutting treatment and the die pressing treatment is not more than 30 min.
It can be understood that, based on production requirements, the cross-sectional dimension of the produced rubber member should also be the same as the cross-sectional dimension of the target rubber member, and the higher the precision of the produced rubber member, the smaller the dimensional deviation from the target rubber member.
In one embodiment, the strip forming process can be controlled so that a formed strip having a total side length of the cross-section of M,
in formula 2, M0The total side length of the cross section of the target rubber part, x is the linear expansion coefficient and T of the rubber part after the preset temperature treatment in the production process1Temperature, T, for the embossing treatment2Is the temperature of normal temperature treatment.
In formula 2, M is the total side length (unit can be length unit such as mm, cm) of the cross section of the molding rubber strip, and M is0Is the total side length (unit is consistent with the unit of M) of the cross section of the target rubber part, x is the linear expansion coefficient of the rubber part after the preset temperature treatment in the production process of the rubber part, and T is1Temperature in ℃, T for the embossing treatment2At normal temperature (in units of deg.C). Illustratively, when the cross section of the target rubber member is circular, the circumference of the circle is the total side length of the cross section of the target rubber member; when the cross section of the target rubber part is triangular, the sum of three sides of the triangle is the total side length of the cross section of the target rubber part.
The invention also provides a production system of the rubber part, which is used for executing the production method of the rubber part.
Fig. 1 is a schematic structural view of a rubber production system in example 1 of the present invention, and as shown in fig. 1, the production system includes a constant temperature processing device, a cutting processing device, a mold pressing processing device, a low temperature processing device, and a normal temperature processing device, which are connected in sequence.
The constant-temperature processing device is used for carrying out constant-temperature processing on the formed rubber strip below 50 ℃, and the cutting processing device is used for cutting the formed rubber strip from the constant-temperature processing device according to the formula 1 to obtain an operation rubber strip with the length of L; the mould pressing treatment device is used for mould pressing the operation rubber strips from the cutting treatment device; the low-temperature treatment device is used for performing low-temperature treatment on the rubber strips subjected to compression molding from the compression molding treatment device at the temperature below 5 ℃; the normal temperature treatment device is used for performing normal temperature treatment on the rubber piece from the low temperature treatment device.
The production system can correspondingly execute the production method, and the implementation principle is the same, which is not described herein again.
It can be understood that the production system further comprises a sizing material mixing device and a rubber strip forming device which are connected with each other, and the rubber strip forming device is connected with the constant temperature processing device. In one mode, the rubber strip forming device can obtain the formed rubber strip with the total side length of the cross section being M according to the formula 2.
Fig. 2 is another schematic structural diagram of a rubber production system in embodiment 2 of the present invention, and as shown in fig. 2, on the basis of fig. 1, the production system further includes a high temperature treatment device, wherein the high temperature treatment device is connected to a normal temperature treatment device.
Wherein the high-temperature treatment device is used for carrying out high-temperature treatment on the rubber piece from the normal-temperature treatment device for more than 100 ℃ and not less than 4 h.
Hereinafter, the method and system for producing a rubber member according to the present invention will be described in detail with reference to specific examples.
Example 1
The production system of the rubber part of the embodiment includes a rubber material mixing device, a rubber strip forming device, a constant temperature processing device, a cutting processing device, a mold pressing processing device, a low temperature processing device and a normal temperature processing device which are connected in sequence as shown in fig. 1.
Example 2
The production system of the rubber part in this embodiment includes a rubber material mixing device, a rubber strip forming device, a constant temperature processing device, a cutting processing device, a mold pressing processing device, a low temperature processing device, a normal temperature processing device, and a high temperature processing device, which are connected in sequence as shown in fig. 2.
Example 3
In this example, a 125.6mm circumference circular nitrile rubber piece is to be produced, and the cross section of the nitrile rubber piece is a 22.3mm circumference circle, and 7 rubber pieces are produced at one time by die pressing. This example was carried out in winter with an ambient temperature of 12 ℃.
The production of the rubber member in the embodiment is performed by the production system in embodiment 1, and specifically includes the following steps:
1. raw nitrile rubber is used as a raw material, a formed rubber strip with a circular cross section is obtained after the raw nitrile rubber is processed by a rubber material mixing device and a rubber strip forming device, and the circular perimeter of the cross section of the formed rubber strip is controlled according to the formula 2;
in formula 2, M022.3mm, x is 0.00023, T1At 150 ℃ T2At 25 ℃; namely, it is
In formula 2, the step of obtaining the linear expansion coefficient 0.00023 of the rubber piece after the preset temperature treatment is as follows: the rubber material is a nitrile rubber mixture obtained by using nitrile rubber raw rubber as an initial raw material and adopting the same process as the step 1 and processing the nitrile rubber raw rubber by a rubber material mixing device, then processing the nitrile rubber mixture for 4 hours at 10 ℃, carrying out mould pressing treatment for 20min at 150 ℃ in a vulcanizing device to obtain a standard test panel, then processing the standard test panel for 4 hours at 0 ℃, processing the standard test panel for 12 hours at 25 ℃ and measuring the linear expansion coefficient to be 0.00023 by using a linear expansion instrument.
2. Carrying out constant temperature treatment on the formed rubber strip in a constant temperature treatment device, wherein the constant temperature treatment temperature is 10 ℃ and the time is 4 hours;
3. the molding rubber strip after the constant temperature treatment in the step 2 is subjected to the progressive cutting treatment in a cutting treatment device to obtain an operation rubber strip with the length of L, wherein the L is obtained by the calculation according to the following formula,
4. and within 30min after the cutting treatment is finished, putting the operation rubber strip into a die cavity, carrying out die pressing treatment at 150 ℃ for 20min, taking out, treating at 0 ℃ for 4h, and treating at 25 ℃ for 12h to obtain the rubber piece.
Example 4
In the summer, the ambient temperature is different from that in the example 3, the ambient temperature is 30 ℃, and the rest of the operation steps and experimental parameters are the same as those in the example 3.
Example 5
In this example, a square ring-shaped epdm rubber piece with a side length of 20mm is to be produced, and the cross section of the rubber piece is a circle with a perimeter of 12.56mm, and 7 rubber pieces are produced at one time by die pressing. This example was carried out in winter with an ambient temperature of 12 ℃.
The production of the rubber member in the embodiment is performed by the production system in embodiment 1, and specifically includes the following steps:
1. taking ethylene propylene diene monomer as a raw material, processing the raw material by a rubber material mixing device and an adhesive tape forming device to obtain a formed adhesive tape with a circular cross section, and controlling the circumference of the circular cross section of the formed adhesive tape according to formula 2;
in formula 2, M0Is 12.56, x is 0.00018, T1At 180 ℃ T2Is 23 ℃;
in formula 2, the step of obtaining the linear expansion coefficient of 0.00018 of the rubber piece after the preset temperature treatment comprises: the rubber material is an ethylene propylene diene monomer raw rubber serving as an initial raw material, the same process as that in the step 1 is adopted, the ethylene propylene diene monomer mixture is obtained after being processed by a rubber material mixing device, the ethylene propylene diene monomer mixture is processed for 4 hours at the temperature of 0 ℃, then mould pressing processing is carried out for 3min at the temperature of 180 ℃ in a vulcanizing device to obtain a standard test plate, then the standard test plate is processed for 4 hours at the temperature of 0 ℃, and after being processed for 12 hours at the temperature of 23 ℃, a linear expansion coefficient of 0.00018 is measured by a linear expansion instrument.
2. Carrying out constant temperature treatment on the formed rubber strip in a constant temperature treatment device, wherein the constant temperature treatment temperature is 0 ℃ and the time is 4 hours;
3. the molding rubber strip after the constant temperature treatment in the step 2 is subjected to the progressive cutting treatment in a cutting treatment device to obtain four operation rubber strips with the length of L, wherein the L is obtained by the calculation according to the following formula,
4. and within 30min after the cutting treatment is finished, putting the operation rubber strip into a die cavity, carrying out die pressing treatment at 180 ℃ for 3min, taking out, treating at 0 ℃ for 4h, and treating at 23 ℃ for 12h to obtain the rubber piece.
Example 6
In this example, a square annular ethylene propylene diene monomer rubber part with a side length of 20mm is to be produced, and the cross section of the rubber part is a circle with a circumference of 12.56mm, and the square annular ethylene propylene diene monomer rubber part is implemented in summer at an ambient temperature of 30 ℃.
The production of the rubber member in the embodiment is performed by the production system in the embodiment 2, and specifically includes the following steps:
1. taking ethylene propylene diene monomer as a raw material, processing the raw material by a rubber material mixing device and an adhesive tape forming device to obtain a formed adhesive tape with a circular cross section, and controlling the circumference of the circular cross section of the formed adhesive tape according to formula 2;
in formula 2, M0Is 12.56, x is 0.000178, T1At 180 ℃ T2Is 23 ℃;
in formula 2, the step of obtaining the linear expansion coefficient 0.000178 of the rubber piece after the preset temperature treatment is as follows: the rubber material is an ethylene propylene diene monomer raw rubber serving as an initial raw material, the same process as that in the step 1 is adopted, the ethylene propylene diene monomer raw rubber is processed by a rubber material mixing device to obtain an ethylene propylene diene monomer mixture, the ethylene propylene diene monomer mixture is processed at 0 ℃ for 4 hours, then the ethylene propylene diene monomer mixture is subjected to mould pressing processing at 180 ℃ in a vulcanizing device for 3 minutes to obtain a standard test plate, the standard test plate is processed at 0 ℃ for 4 hours, processed at 23 ℃ for 12 hours and then at 170 ℃ for 8 hours, naturally cooled to room temperature, and then a linear expansion coefficient is measured by a linear expansion instrument to be 0.000178.
2. Carrying out constant temperature treatment on the formed rubber strip in a constant temperature treatment device, wherein the constant temperature treatment temperature is 0 ℃ and the time is 4 hours;
3. the molding rubber strip after the constant temperature treatment in the step 2 is subjected to the progressive cutting treatment in a cutting treatment device to obtain four operation rubber strips with the length of L, wherein the L is obtained by the calculation according to the following formula,
4. and within 30min after the cutting treatment is finished, putting the operation rubber strip into a die cavity, carrying out die pressing treatment at 180 ℃ for 3min, taking out, treating at 0 ℃ for 4h, and treating at 23 ℃ in an oven for 12h to obtain the rubber part.
5. And (4) processing the rubber piece after the step (4) in a high-temperature processing device at the temperature of 170 ℃ for 8 hours, and naturally cooling to room temperature to obtain the final rubber piece.
Comparative example 1
In this comparative example 1, a conventional production method is adopted to produce a circular nitrile rubber piece with a circumference of 125.6mm, the cross section of the rubber piece is a circle with a circumference of 22.3mm, and 7 rubber pieces are produced by one-step molding, wherein the rubber piece is produced in winter in the present embodiment at an ambient temperature of 12 ℃.
The preparation method of this comparative example comprises the following steps:
1. taking nitrile butadiene rubber raw rubber as a raw material, mixing the raw rubber with a rubber material, forming the rubber strip, and cutting the rubber strip according to production experience to obtain an operation rubber strip with the length of about 129.5mm and the circular circumference of the cross section of about 23 mm;
2. and (3) putting the operation rubber strip into a die cavity, carrying out die pressing treatment at 150 ℃ for 20min, taking out, and naturally cooling at ambient temperature.
Comparative example 2
In the comparative example 2, a conventional production method is adopted, a circular nitrile rubber piece with the circumference of 125.6mm is to be produced, the cross section of the rubber piece is a circle with the circumference of 22.3mm, 7 rubber pieces are produced by one-step die pressing, and the temperature in summer is 30 ℃ in the environment.
The preparation method of this comparative example comprises the following steps:
1. taking nitrile butadiene rubber raw rubber as a raw material, mixing the raw rubber with a rubber material, forming the rubber strip, and cutting the rubber strip according to production experience to obtain an operation rubber strip with the length of about 129.5mm and the circular circumference of the cross section of about 23 mm;
2. and (3) putting the operation rubber strip into a die cavity, carrying out die pressing treatment at 150 ℃ for 20min, taking out, and naturally cooling at ambient temperature.
Test examples
The rubber members of examples 3 to 6 and comparative examples 1 to 2 described above were subjected to dimensional deviation test. The results are shown in Table 1.
The detection method comprises the following steps: the dimensions of 7 rubber parts produced in one molding were measured using a profilometer and expressed as X. + -. δ as a statistical result. Wherein X is the average value of the maximum limit size and the minimum limit size of the size, and delta is the algebraic difference obtained by subtracting X from the maximum limit size and the minimum limit size.
TABLE 1
| Deviation of dimension | |
| Example 3 | 125.6±0.3mm |
| Example 4 | 125.6±0.3mm |
| Example 5 | 20±0.05mm |
| Example 6 | 20±0.02mm |
| Comparative example 1 | 125.6±1mm |
| Comparative example 2 | 125.6±1.2mm |
From table 1, it can be seen that:
1) compared with comparative examples 1 and 2, the dimensional deviation of the rubber pieces in examples 3 and 4 is obviously reduced, which shows that the dimensional deviation of the produced rubber piece and the target rubber piece can be reduced by carrying out constant temperature treatment, cutting treatment, low temperature treatment and normal temperature treatment on the rubber piece according to the invention, and the dimensional precision of the rubber piece produced by adopting the method of the invention is not influenced by the external environment temperature.
2) The dimensional deviation of the rubber member in example 6 was further reduced as compared with example 5, which shows that the dimensional deviation of the rubber member from the target rubber member size can be further reduced by performing the high-temperature treatment after vulcanization molding.
In conclusion, the scheme of the invention can effectively reduce the deviation between the actual size of the rubber part and the size of the target rubber part.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A production method of a rubber part is characterized by comprising the following steps:
1) cutting the molding rubber strip after constant temperature treatment to obtain an operation rubber strip with the length of L;
2) carrying out mould pressing treatment on the operation rubber strip, and then sequentially carrying out low-temperature treatment and normal-temperature treatment to obtain the rubber piece;
the temperature of the constant temperature treatment is below 50 ℃, and the time of the constant temperature treatment is not less than 4 h;
the low-temperature treatment temperature is below 5 ℃, and the low-temperature treatment time is not less than 4 h;
the temperature of the normal-temperature treatment is 21-25 ℃, and the time of the normal-temperature treatment is 12-36 h;
wherein the cutting process is performed according to equation 1,
in the formula 1, L0Length of the target rubber part, x is the rubber part raw materialThe linear expansion coefficient and T of the rubber part after the temperature treatment is preset in the production process1Temperature, T, for the embossing treatment2Is the temperature of normal temperature treatment.
2. The method for producing rubber members according to claim 1, further comprising, after said room temperature treatment: carrying out high-temperature treatment on the rubber piece treated at the normal temperature to obtain the rubber piece; the high-temperature treatment temperature is above 100 ℃, and the high-temperature treatment time is not less than 4 h.
3. The method for producing a rubber member according to claim 2, wherein the high-temperature treatment is performed at a temperature of 100 to 230 ℃ for 4 to 24 hours.
4. The method for producing a rubber member according to any one of claims 1 to 3, wherein the temperature of the constant temperature treatment is 0 to 50 ℃ for 4 to 24 hours.
5. The method for producing a rubber member according to any one of claims 1 to 3, wherein the low-temperature treatment is carried out at a temperature of-200 to 5 ℃ for 4 to 24 hours.
6. The method for producing rubber member according to claim 1, wherein the time interval between said molding treatment and said low-temperature treatment is not more than 5 min.
7. The method for producing rubber member according to claim 1, wherein the time interval between said cutting process and said molding process is not more than 30 min.
8. The method for producing rubber member according to claim 1, wherein the shaped rubber strip has a cross section with a total side length of M,
in formula 2, M0The total side length of the cross section of the target rubber part, x is the linear expansion coefficient and T of the rubber part after the preset temperature treatment in the production process of the rubber part1Temperature, T, for the embossing treatment2Is the temperature of normal temperature treatment.
9. A production system for carrying out the method for producing rubber members according to any one of claims 1 to 8, comprising:
the device comprises a constant temperature processing device, a cutting processing device, a mould pressing processing device, a low temperature processing device and a normal temperature processing device which are connected in sequence.
10. The production system of claim 9, further comprising a high temperature processing device connected to the ambient temperature processing device.
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