CN113232348A - Production process of high-strength and high-toughness sealing ring for high-speed rail - Google Patents
Production process of high-strength and high-toughness sealing ring for high-speed rail Download PDFInfo
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- CN113232348A CN113232348A CN202110403602.1A CN202110403602A CN113232348A CN 113232348 A CN113232348 A CN 113232348A CN 202110403602 A CN202110403602 A CN 202110403602A CN 113232348 A CN113232348 A CN 113232348A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0082—Producing articles in the form of closed loops, e.g. rings
- B29D99/0085—Producing articles in the form of closed loops, e.g. rings for sealing purposes
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
Abstract
A production process of a high-strength and high-toughness sealing ring for high-speed rail comprises the following steps of S1: feeding natural rubber into an internal mixer, discharging after internal mixing, and then performing mastication; s2: mixing the nitrile rubber, the natural rubber subjected to mastication in the step 1), the phenylene ether silicone rubber and the maleic anhydride grafted polyethylene in an open mill, and uniformly mixing to obtain mixed silicone rubber; s3: feeding the mixed silicon rubber into an internal mixer, adding white carbon black, aluminum oxide, zinc oxide, an anti-aging agent and a heat stabilizer, and continuously mixing; then cooling, adding toluene diisocyanate and a cross-linking agent, and continuing mixing; then discharging rubber, turning over by an open mill, then discharging and cooling; s4: rolling and molding the cooled rubber material by a rolling mill; s5: cutting the semi-finished product after the calendaring molding into rubber particles; s6: delivering the rubber particles into a mould for vulcanization molding; in addition, the vulcanizing machine is further improved, so that a high-strength and high-toughness sealing ring is obtained.
Description
Technical Field
The invention belongs to the technical field of rubber vulcanization production, and particularly relates to a production process of a high-strength and high-toughness sealing ring for a high-speed rail.
Background
Vulcanization is also known as crosslinking and curing. Adding cross-linking assistant, such as vulcanizing agent and promoter, into rubber, and converting linear macro molecule into three-dimensional network structure under certain temperature and pressure. Since the cross-linking of natural rubber was first achieved with sulfur, so called vulcanization, "vulcanization" is so named because the original natural rubber product was cross-linked with sulfur as a cross-linking agent, and with the development of the rubber industry, cross-linking with a variety of non-sulfur cross-linking agents is now possible. The more scientific meaning of vulcanization is therefore "crosslinking" or "bridging", i.e. the process of forming a network of macromolecules by crosslinking linear macromolecules. The seal ring contains rubber as a sealing component, so that vulcanization treatment needs to be carried out on the seal ring in the production process.
The sealing ring usually comprises a metal part and a rubber part, wherein the metal part is used as a framework to play a role in supporting, positioning and shaping, the rubber part is mainly used as a sealing part, and the rubber part and the metal part are required to be assembled and combined in the production process; the traditional production method comprises the steps of carrying out banburying and other processes on rubber, extending the rubber into a rubber sheet with a certain thickness, cutting the rubber sheet into rubber strips with a certain length and width according to the designed size, putting metal parts into a pre-designed vulcanization mold in a vulcanization processing link, rolling the rubber strips at corresponding positions of the vulcanization mold, pressing and pressurizing the vulcanization mold through a hydraulic device, heating to a set temperature, keeping for a certain time, ending vulcanization, and manually taking out the formed sealing ring to finish the vulcanization of the sealing ring.
For a sealing ring for high-speed rail, due to the limitation of rubber materials and process requirements, the vulcanization temperature adopted in the vulcanization process is not too high, so that the vulcanization time is inevitably prolonged, for example, when the vulcanization temperature is 140 ℃, the vulcanization time is 15min, and when the vulcanization temperature is 130 ℃, the vulcanization time is 30min, but the traditional vulcanization device is usually a vulcanizing machine which always keeps applying pressure and heating on rubber in the vulcanization process, when the high-temperature vulcanization is carried out, the time is about 1min-15s, because the time is short, the influence on the production is not obvious, but when the low-temperature vulcanization is carried out for a long time, the vulcanizing machine is occupied for a long time, the utilization rate of the vulcanizing machine in a workshop is low, and the production efficiency is low; in addition, the mode of exerting pressure is vulcanized to traditional vulcanizer and drives pressure disk extrusion die's cope match-plate pattern to pressurize to the sealing washer in the mould for the pneumatic cylinder above the mould, like this in compression process, the rubber of first with the cope match-plate pattern contact obtains the compression earlier, then extrudees the rubber of lower floor gradually, this pressure that just leads to the sealing washer to obtain reduces gradually from top to bottom, must lead to the vulcanization degree of sealing washer upper strata and lower floor to appear obvious difference then, this difference will produce crucial influence to toughness, elasticity and life of sealing washer.
Disclosure of Invention
The invention aims to provide a production process of a high-strength and high-toughness sealing ring for high-speed rail, which aims to solve the technical problems in the background technology.
In order to solve the technical problem, the invention aims to realize that:
a production process of a high-strength and high-toughness sealing ring for high-speed rail,
s1: feeding natural rubber into an internal mixer, masticating for 10-15 min at the temperature of 140-150 ℃, and discharging; storing the masticated natural rubber at room temperature for more than 48h for later use;
s2: mixing the nitrile rubber, the natural rubber subjected to mastication in the step 1), the phenylene ether silicone rubber and the maleic anhydride grafted polyethylene in an open mill, and uniformly mixing to obtain mixed silicone rubber;
s3: feeding the mixed silicon rubber into an internal mixer, adding white carbon black, aluminum oxide, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 10-15 min at the temperature of 103-108 ℃; then continuously mixing for 8-12 min at the temperature of 113-118 ℃; then, cooling to 108-110 ℃, adding toluene diisocyanate and a cross-linking agent, and continuously mixing for 8-10 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
s4: carrying out calendering molding on the cooled rubber material by a calender;
s5: cutting and processing the semi-finished product after calendaring to form rubber particles with regular shapes;
s6: feeding rubber particles into a mold cavity of a mold, and vulcanizing by a vulcanizing machine to obtain a finished sealing ring;
the vulcanizing machine comprises a compression device, the compression device comprises a compression platform, a mold, a first compression mechanism, a second compression mechanism and a synchronous compression assembly, the mould is placed on the compression platform and comprises a mould frame, an upper mould plate and a lower mould plate, the mould frame, the upper mould plate and the lower mould plate enclose a sealing ring accommodating space, the synchronous compression assembly comprises a first cylinder body and a first piston, the first piston and the bottom of the first cylinder body enclose a first accommodating space, the bottom of the first cylinder body is contacted with the first template, the first cylinder body is fixedly connected with a first joint which is communicated with the first accommodating space, the output end of the first compression mechanism applies a tendency force to the first piston to force the first piston to move towards the direction of compressing the first accommodating space and drive the upper template to move towards the die frame; the second compression mechanism comprises a second cylinder body, a second piston and a second piston rod, a second accommodating space is enclosed by the second piston and the bottom of the second cylinder body, the second piston rod is fixedly arranged on the side, deviating from the second accommodating space, of the second piston, the end part of the second piston rod is in contact with the second template, a second joint and a third joint are fixedly arranged on the second cylinder body, the second joint is communicated with the second accommodating space, a pipeline is used for communicating the second joint with the first joint, and the third joint is communicated with a chamber on the side, deviating from the second accommodating space, of the second piston; the first accommodating space is filled with a compression medium, when the first piston compresses the first accommodating space, the compression medium enters the second accommodating space through the pipeline, the second piston is forced to move towards the direction far away from the bottom of the second cylinder body, the lower die frame is driven by the aid of the second piston rod to move towards the die frame, and therefore the upper die plate and the lower die plate synchronously act to compress the accommodating space of the sealing ring.
On the basis of the above scheme and as a preferable scheme of the scheme: still include the fixed pin, the side of framed, cope match-plate pattern and lower bolster is seted up owing to wear to establish the passageway of fixed pin the cope match-plate pattern with when the lower bolster is compressed to setting for the compression position, the fixed pin can penetrate in the passageway, thereby makes cope match-plate pattern and lower bolster keep current position.
On the basis of the above scheme and as a preferable scheme of the scheme: and the lower template and the upper template are provided with mutually matched die cavities.
On the basis of the above scheme and as a preferable scheme of the scheme: the die cavity is provided with a plurality of die cavities.
On the basis of the above scheme and as a preferable scheme of the scheme: the compression device comprises the following operation steps:
step one, placing a metal framework into a die cavity of a lower template: placing a lower die frame on a compression platform, aligning the die frame with the lower die frame, then placing the lower die frame on the compression platform, placing a metal framework into a die cavity of a lower die plate, adding a rubber material into the die cavity, aligning an upper die plate with the die frame, and then assembling the upper die plate and the die frame;
step two, compression: controlling the first compression mechanism to drive the first piston to compress the first accommodating space and drive the upper template to move downwards, and simultaneously, compressing a compression medium in the first accommodating space to enter the second accommodating space under pressure so that the second piston drives the second piston rod to move upwards and further drive the lower template to move upwards, so that the upper template and the lower template compress the rubber in the accommodating space of the sealing ring; the vulcanizer starts to heat;
step three, compression and sizing: after the upper template and the lower template compress the rubber material in the sealing ring accommodating space to a set size, the fixing pin is inserted into the through hole, so that the upper template and the lower template keep the current positions;
step four, moving out the die: the output end of the first compression mechanism is controlled to retract, a compressed medium with pressure is introduced into the third joint while the output end of the first compression mechanism retracts, so that the bottom of the second cylinder body approaches to the second piston, meanwhile, the volume of the second accommodating space is compressed, the compressed medium in the second accommodating space returns to the first accommodating space, the first piston moves towards the top of the first cylinder body, the whole mold is released by the first compression mechanism and the second compression mechanism at the moment and can move freely, and the first compression mechanism and the second compression mechanism can perform compression molding on the next mold;
step five, continuing heating: and transferring the compressed mould into a heat preservation furnace for heat preservation, moving out the mould from the heat preservation furnace after the heat preservation is carried out for a set time, taking down the fixing pin, and taking out the upper template, the lower template and the sealing ring.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that: 1. the process is used for processing the rubber, and the sealing ring is subjected to pressurization vulcanization by matching with a vulcanizing machine, so that the whole sealing ring is vulcanized and molded.
2. Through the compression device of this application, do benefit to the shaping that realizes the sealing washer, on the other hand is vulcanizing pressurized's in-process to the sealing washer, can be so that the upper and lower isobaric stress compression of sealing washer to can keep the compression to the sealing washer in the course of the treatment, can make the vulcanization of sealing washer more even.
Drawings
FIG. 1 is a schematic diagram of an overall structure of an embodiment of the present invention;
FIG. 2 is a schematic view of a mold according to an embodiment of the present invention in a compressed state;
FIG. 3 is a schematic diagram of the overall structure of the second embodiment of the present invention;
FIG. 4 is a schematic view of a second mold according to an embodiment of the present invention in a compressed state;
fig. 5 is a schematic structural view of a use state of the fixing pin.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step, based on the given embodiments, fall within the scope of protection of the present application.
In the description of the present application, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated.
Aiming at the technical problems in the prior art, the present application proposes an improvement scheme, and the following description is made in combination with specific embodiments:
example one
A production process of a high-strength and high-toughness sealing ring for high-speed rail,
s1: feeding natural rubber into an internal mixer, masticating for 10-15 min at the temperature of 140-150 ℃, and discharging; storing the masticated natural rubber at room temperature for more than 48h for later use;
s2: mixing the nitrile rubber, the natural rubber subjected to mastication in the step 1), the phenylene ether silicone rubber and the maleic anhydride grafted polyethylene in an open mill, and uniformly mixing to obtain mixed silicone rubber;
s3: feeding the mixed silicon rubber into an internal mixer, adding white carbon black, aluminum oxide, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 10-15 min at the temperature of 103-108 ℃; then continuously mixing for 8-12 min at the temperature of 113-118 ℃; then, cooling to 108-110 ℃, adding toluene diisocyanate and a cross-linking agent, and continuously mixing for 8-10 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
s4: carrying out calendering molding on the cooled rubber material by a calender;
s5: cutting and processing the semi-finished product after calendaring to form rubber particles with regular shapes;
s6: feeding rubber particles into a mold cavity of a mold, and vulcanizing by a vulcanizing machine to obtain a finished sealing ring;
in this embodiment, the vulcanizer includes a compression device, the compression device includes a compression platform 10, a mold 40, a first compression mechanism 20, a second compression mechanism 50, and a synchronous compression assembly 30, the mold 40 is placed on the compression platform 10, the mold 40 includes a mold frame 41, an upper mold plate 42, and a lower mold plate 43, the mold frame 41, the upper mold plate 42, and the lower mold plate 43 enclose a seal ring accommodating space 44, the synchronous compression assembly 30 includes a first cylinder 31 and a first piston 32, the first piston 32 and the bottom of the first cylinder 31 enclose a first accommodating space 34, the bottom of the first cylinder 31 is fixedly connected with the first mold plate 42, the first cylinder 31 is fixedly connected with a first joint 33, the first joint 33 is communicated with the first accommodating space 34, an output end 211 of the first compression mechanism applies a biasing force to the first piston 32 to force the first piston 32 to move toward a direction of compressing the first accommodating space 34, simultaneously, the upper template 42 is driven to move towards the inside of the template frame 41; the second compression mechanism 50 comprises a second cylinder 51, a second piston 52 and a second piston rod 53, a second accommodating space 55 is enclosed by the bottom of the second piston 52 and the bottom of the second cylinder 51, the second piston rod 53 is fixedly arranged on the second piston 52 at the side away from the second accommodating space 55, the end of the second piston rod 53 is fixedly connected with the second template 43, a second joint 54 and a third joint 56 are fixedly arranged on the second cylinder 51, the second joint 54 is communicated with the second accommodating space 55, and a pipeline connects the second joint 54 with the first joint 33; the first accommodating space 33 is filled with a compressed medium, in this embodiment, preferably, the first compression mechanism 20 is an oil cylinder, after hydraulic oil is introduced into the oil inlet 212, the output end of the oil cylinder drives the first piston 32 to move to compress the first accommodating space 33, when the first piston 32 compresses the first accommodating space 33, the compressed medium enters the second accommodating space 55 through a pipeline, so that the second piston 52 is forced to move in a direction away from the bottom of the second cylinder 51, and the second piston rod 53 drives the lower mold frame 43 to move towards the mold frame 41, so that the upper mold plate 42 and the lower mold plate 43 synchronously move to compress the seal ring accommodating space 44. After the compression is finished, the hydraulic oil in the oil inlet 212 is released, hydraulic oil with pressure is introduced into the third connector 56, so that the upper part of the second piston is pressed to move downwards, the volume of the second accommodating space is reduced due to downward movement, a compressed medium is pressed into the first accommodating space, the first piston 32 is forced to move upwards, the output end of the first compression mechanism is pressed back to the initial state, and therefore linkage is achieved.
The compression device of the present embodiment facilitates the formation of the seal ring 60; on the other hand, in the traditional compression molding process, the rubber material 61 in the mold frame is compressed only by pressurizing the upper mold plate, so that in the compression process, the rubber material firstly contacted with the upper mold plate is compressed firstly, then the lower layer of rubber material is gradually extruded, the pressure of the compressed rubber material is gradually reduced from top to bottom, the upper part and the lower part of the rubber material are not uniformly vulcanized, the step-by-step difference of the two surfaces of the molded sealing ring is easily caused, the upper mold plate and the lower mold plate can realize synchronous compression by the compression device of the application, in the process of processing the rubber material, the upper surface and the lower surface of the rubber material can be compressed under equal pressure, in addition, the pressure of the upper mold plate and the lower mold plate is equal by the structural combination of the synchronous compression component and the lower compression structure, so that the pressure is more uniform in the vulcanization process of the rubber material, the vulcanization degree of the sealing ring is more uniform, and the gradual difference is not easy to occur.
Example two
Considering that in the production process, due to the limitation of rubber materials and process requirements, the vulcanization temperature adopted in the vulcanization process is not too high, so that the vulcanization time is inevitably prolonged, for example, when the vulcanization temperature is 140 ℃, the vulcanization time is 15min, and when the vulcanization temperature is 130 ℃, the vulcanization time is 30min, but the traditional vulcanization device is usually a vulcanizing machine which always keeps applying pressure and heating on rubber in the vulcanization process, and when the vulcanization is carried out at high temperature, the vulcanization time is about 1min-15s, because the vulcanization time is short, the influence on the production is not obvious, but when the vulcanization is carried out at low temperature for a long time, the vulcanizing machine is occupied for a long time, the utilization rate of the vulcanizing machine in a workshop is reduced, and the production efficiency is low; for this reason, the present embodiment is different from the first embodiment in that: the compressing device comprises a compressing platform 10, a mould 40 and a first compressing mechanism 20, the mold 40 is placed on the compression platform 10, the mold 40 comprises a mold frame 41, an upper mold plate 42 and a lower mold plate 43, the mold frame 41, the upper mold plate 42 and the lower mold plate 43 enclose a seal ring accommodating space 44, the synchronous compression assembly 30 comprises a first cylinder 31 and a first piston 32, the first piston 32 and the bottom of the first cylinder 31 enclose a first accommodating space 34, the bottom of the first cylinder 31 is in contact with the first mold plate 42, a first joint 33 is fixedly connected to the first cylinder 31, the first joint 33 is communicated with the first accommodating space 34, and an output end 211 of the first compression mechanism applies a biasing force to the first piston 32 to force the first piston 32 to move towards the direction of compressing the first accommodating space 34 and drive the upper mold plate 42 to move towards the mold frame 41; the second compression mechanism 50 comprises a second cylinder 51, a second piston 52 and a second piston rod 53, a second accommodating space 55 is enclosed by the second piston 52 and the bottom of the second cylinder 51, the second piston rod 53 is fixedly arranged on the second piston 52 at the side away from the second accommodating space 55, the end of the second piston rod 53 is in contact with the second template 43, a second joint 54 is fixedly arranged on the second cylinder 51, the second joint 54 is communicated with the second solute space 55, and a pipeline connects the second joint 54 and the first joint 33; the first accommodating space 33 is filled with a compressed medium, when the first piston 32 compresses the first accommodating space 33, the compressed medium enters the second accommodating space 55 through a pipeline, the second piston 52 is forced to move in a direction away from the bottom of the second cylinder 51, the lower mold frame 43 is driven by the second piston rod 53 to move in the mold frame 41, and therefore the upper mold plate 42 and the lower mold plate 43 synchronously act to compress the seal ring accommodating space 44. Therefore, after compression is finished, the first compression mechanism 20 and the second compression mechanism 50 can be separated from the mold 40, so that the mold can be moved out of the compression device after compression molding, the compression device can compress the next mold, and the production efficiency and the utilization rate of a machine table are improved.
Further, in order to make the upper and lower templates still keep compressing after the pressure of the first and second compressing mechanisms is removed, the present embodiment preferably further includes a fixing pin 46, a channel 411/421/431/through which the fixing pin 46 passes is opened on the side of the mold frame 41, the upper template 42 and the lower template 43, and when the upper template 42 and the lower template 43 are compressed to a set compression position, the fixing pin 46 can penetrate into the channel, so that the upper template 42 and the lower template 43 keep the current position; the fixing pin 46 can be removed relatively easily after the vulcanization process due to the elasticity of the sealing ring, and the sealing ring can be separated from the mold more easily.
As a further preference of the present embodiment, the compression device comprises the following operation steps:
step one, placing a metal framework into a die cavity of a lower template: placing a sealing ring accommodating space 43 of a lower mold frame sealing ring accommodating space on a sealing ring accommodating space 10 of a compression platform sealing ring accommodating space, aligning a 41 sealing ring accommodating space of a mold frame sealing ring accommodating space with the 43 sealing ring accommodating space of the lower mold frame sealing ring accommodating space, then placing the aligned space on the 10 sealing ring accommodating space of the compression platform sealing ring accommodating space, placing a metal framework into a mold cavity of a lower mold plate, adding a rubber material into the mold cavity, aligning a 42 sealing ring accommodating space of an upper mold plate sealing ring accommodating space with the 41 sealing ring accommodating space of the mold frame sealing ring accommodating space, and then assembling the aligned space and the rubber material;
step two, compression: the sealing ring accommodating space 20 of the first compression mechanism sealing ring accommodating space is controlled to drive the sealing ring accommodating space 32 of the first piston sealing ring accommodating space to compress the sealing ring accommodating space 34 of the first accommodating space sealing ring accommodating space, the sealing ring accommodating space 42 of the upper template sealing ring is driven to move downwards, meanwhile, a compression medium in the sealing ring accommodating space 34 of the first accommodating space is pressed into the second accommodating space, so that the sealing ring accommodating space 52 of the second piston sealing ring accommodating space drives the sealing ring accommodating space 53 of the second piston rod sealing ring to move upwards, and further the sealing ring accommodating space 43 of the lower template sealing ring accommodating space is driven to move upwards, and therefore the upper template and the lower template compress rubber in the sealing ring accommodating space; the vulcanizer starts to heat;
step three, compression and sizing: the upper template sealing ring accommodating space 42 and the lower template sealing ring accommodating space 43 compress rubber materials in the sealing ring accommodating space 44 and the sealing ring accommodating space to set sizes, and then the fixing pins are inserted into the through holes, so that the sealing ring accommodating space of the upper template sealing ring accommodating space 42 and the sealing ring accommodating space of the lower template sealing ring accommodating space 43 keep current positions;
step four, moving out the sealing ring accommodating space 40 of the mold: the output end of the sealing ring accommodating space of the first compression mechanism sealing ring accommodating space 20 is controlled to retract, a compressed medium with pressure is introduced into the sealing ring accommodating space of the third joint sealing ring accommodating space 56 while retracting, so that the bottom of the sealing ring accommodating space of the second cylinder sealing ring accommodating space 51 is close to the sealing ring accommodating space of the second piston sealing ring accommodating space 52, meanwhile, the volume of the sealing ring accommodating space of the second accommodating space 55 is compressed, the compressed medium in the sealing ring accommodating space of the second accommodating space 55 returns to the sealing ring accommodating space of the first accommodating space 34, and then the sealing ring accommodating space of the first piston sealing ring accommodating space 32 moves towards the top of the sealing ring accommodating space of the first cylinder sealing ring accommodating space 31, and at the moment, the whole mold is moved by the sealing ring accommodating space of the first compression mechanism sealing ring accommodating space 20 and the sealing ring accommodating space of the second compression mechanism sealing ring The accommodating space 50 for the seal ring is released and can move freely, and the seal ring accommodating space 20 of the first compression mechanism seal ring accommodating space and the seal ring accommodating space 50 of the second compression mechanism seal ring accommodating space can compress and form the seal ring accommodating space 40 of the next mold seal ring accommodating space;
step five, continuing heating: transferring the compressed sealing ring accommodating space 40 of the mold sealing ring into a heat preservation furnace for heat preservation, moving out the mold from the heat preservation furnace after heat preservation is carried out for a set time, taking down the sealing ring accommodating space of the fixing pin sealing ring accommodating space 46, and taking out the sealing ring accommodating space of the upper template sealing ring accommodating space 42, the sealing ring accommodating space of the lower template sealing ring accommodating space 43 and the sealing ring.
Through the technical scheme of this embodiment for the mould after the vulcanizer compression can separate with the vulcanizer, thereby shift to another holding furnace in and keep warm, satisfy on the one hand and continue to keep sufficient pressure when heating, on the other hand has liberated the vulcanizer, and the sealing washer quantity that the vulcanizer can compress the vulcanization in unit time then will be more, has solved the problem that exists among the background art, has improved production efficiency and board utilization ratio.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (5)
1. A production process of a high-strength and high-toughness sealing ring for a high-speed rail is characterized by comprising the following steps of:
s1: feeding natural rubber into an internal mixer, masticating for 10-15 min at the temperature of 140-150 ℃, and discharging; storing the masticated natural rubber at room temperature for more than 48h for later use;
s2: mixing the nitrile rubber, the natural rubber subjected to mastication in the step 1), the phenylene ether silicone rubber and the maleic anhydride grafted polyethylene in an open mill, and uniformly mixing to obtain mixed silicone rubber;
s3: feeding the mixed silicon rubber into an internal mixer, adding white carbon black, aluminum oxide, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 10-15 min at the temperature of 103-108 ℃; then continuously mixing for 8-12 min at the temperature of 113-118 ℃; then, cooling to 108-110 ℃, adding toluene diisocyanate and a cross-linking agent, and continuously mixing for 8-10 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
s4: carrying out calendering molding on the cooled rubber material by a calender;
s5: cutting and processing the semi-finished product after calendaring to form rubber particles with regular shapes;
s6: feeding rubber particles into a mold cavity of a mold, and vulcanizing by a vulcanizing machine to obtain a finished sealing ring;
the vulcanizing machine comprises a compression device, the compression device comprises a compression platform (10), a mold (40), a first compression mechanism (20), a second compression mechanism (50) and a synchronous compression assembly (30), the mold (40) is placed on the compression platform (10), the mold (40) comprises a mold frame (41), an upper mold plate (42) and a lower mold plate (43), a seal ring accommodating space (44) is enclosed by the mold frame (41), the upper mold plate (42) and the lower mold plate (43), the synchronous compression assembly (30) comprises a first cylinder body (31) and a first piston (32), a first accommodating space (34) is enclosed by the first piston (32) and the bottom of the first cylinder body (31), the bottom of the first cylinder body (31) is in contact with the first mold plate (42), and a first joint (33) is fixedly connected onto the first cylinder body (31), the first joint (33) is communicated with the first accommodating space (34), and the output end (211) of the first compression mechanism applies a tendency force to the first piston (32) to force the first piston (32) to move towards the direction of compressing the first accommodating space (34) and drive the upper template (42) to move towards the mold frame (41); the second compression mechanism (50) includes a second cylinder (51), a second piston (52), and a second piston rod (53), the second piston (52) and the bottom of the second cylinder (51) enclose a second accommodating space (55), the second piston rod (53) is fixedly arranged on the side of the second piston (52) departing from the second accommodating space (55), the end of the second piston rod (53) is in contact with the second template (43), the second cylinder body (51) is fixedly provided with a second joint (54) and a third joint (56), the second joint (54) is communicated with the second containing space (55), a pipeline is used for communicating the second joint (54) with the first joint (33), the third joint (56) is communicated with a side chamber of the second piston (52) facing away from the second accommodating space (55); the first accommodating space (33) is filled with a compression medium, when the first piston (32) compresses the first accommodating space (33), the compression medium enters the second accommodating space (55) through the pipeline, the second piston (52) is forced to move in the direction away from the bottom of the second cylinder (51), the lower die frame (43) is driven to move in the die frame (41) by the aid of the second piston rod (53), and therefore the upper die plate (42) and the lower die plate (43) synchronously act to compress the sealing ring accommodating space (44).
2. The production process of the high-strength high-toughness seal ring for the high-speed rail according to claim 2, wherein: the die frame is characterized by further comprising fixing pins (46), wherein a channel for penetrating the fixing pins (46) is formed in the side faces of the die frame (41), the upper die plate (42) and the lower die plate (43), and when the upper die plate (42) and the lower die plate (43) are compressed to a set compression position, the fixing pins (46) can penetrate into the channel, so that the upper die plate (42) and the lower die plate (43) can keep the current positions.
3. The process for producing a high-strength, high-toughness seal ring for high-speed rails according to any one of claims 1 to 4, wherein: and the lower template (43) and the upper template (42) are provided with mutually matched die cavities.
4. The production process of the high-strength high-toughness seal ring for the high-speed rail according to any one of claims 3, wherein: the die cavity is provided with a plurality of die cavities.
5. The production process of the high-strength high-toughness seal ring for the high-speed rail according to claim 3, wherein: the compression device comprises the following operation steps:
step one, placing a metal framework into a die cavity of a lower template: placing a lower die frame (43) on a compression platform (10), centering a die frame (41) and the lower die frame (43) and then placing the die frame and the lower die frame on the compression platform (10), placing a metal framework into a die cavity of a lower die plate, adding a rubber material into the die cavity, centering an upper die plate (42) and the die frame (41) and then assembling the upper die plate and the die frame;
step two, compression: controlling a first compression mechanism (20) to drive a first piston (32) to compress a first accommodating space (34) and drive an upper template (42) to move downwards, and simultaneously, compressing media in the first accommodating space (34) are pressed into a second accommodating space to enable a second piston (52) to drive a second piston rod (53) to move upwards and further drive a lower template (43) to move upwards, so that the upper template and the lower template compress rubber in a sealing ring accommodating space; the vulcanizer starts to heat;
step three, compression and sizing: after the upper template (42) and the lower template (43) compress the rubber material in the sealing ring accommodating space (44) to a set size, inserting a fixing pin into the through hole to enable the upper template (42) and the lower template (43) to keep the current positions;
step four, removing the mould (40): controlling the output end of the first compression mechanism (20) to retract, introducing a compressed medium with pressure into the third joint (56) while retracting, enabling the bottom of the second cylinder (51) to approach the second piston (52), compressing the volume of the second accommodating space (55), returning the compressed medium in the second accommodating space (55) to the first accommodating space (34), further moving the first piston (32) to the top of the first cylinder (31), releasing the whole mold by the first compression mechanism (20) and the second compression mechanism (50) at the moment, and enabling the first compression mechanism (20) and the second compression mechanism (50) to perform compression molding on the next mold (40);
step five, continuing heating: and transferring the compressed mold (40) into a heat preservation furnace for heat preservation, moving the mold out of the heat preservation furnace after the heat preservation is carried out for a set time, taking down the fixing pin (46), and taking out the upper template (42), the lower template (43) and the sealing ring.
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