CN212331649U

CN212331649U - Manufacturing equipment of plastic oil bearing and manufacturing equipment of plastic oil element

Info

Publication number: CN212331649U
Application number: CN202021439246.6U
Authority: CN
Inventors: 赵联春; 郑志武; 侯偏喜; 赵纪辉
Original assignee: Luoyang Motip Lubrication Technology Co ltd; Shanghai F&s Bearing Tech Co ltd
Current assignee: Luoyang Motip Lubrication Technology Co ltd; Shanghai F&s Bearing Tech Co ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2021-01-12
Anticipated expiration: 2030-07-20

Abstract

The plastic oil bearing making apparatus includes heating the viscous fluid plastic oil material to molten state, high pressure injection into the bearing cavity inside the injection mold, cooling and hardening to obtain the microporous oil-containing lubricating material, i.e. the molded plastic oil, and finally making the plastic oil bearing. With the plastic state oil raw materials with stickness fluid state add bearing inner chamber after put into the oven again and heat and make the melting of plastic state oil compare, the utility model has the advantages of some lists such as production efficiency height, low in production cost, production quality are stable, can make the precision that current technology and equipment can't be made in addition and mould the state oil bearing and take the plastic cage of moulding, extended the application range of this novel lubricating material of plastic state oil, have urgent and important engineering practical meaning. The manufacturing process and equipment of the plastic state oil element have the advantages that the molten state plastic state oil is directly injected into a cavity of an injection molding die in a high-pressure injection mode.

Description

Manufacturing equipment of plastic oil bearing and manufacturing equipment of plastic oil element

Technical Field

The utility model relates to a mould attitude oil bearing's preparation equipment and mould attitude oil component's preparation equipment.

Background

Compared with a rolling bearing adopting oil lubrication and grease lubrication, the plastic oil rolling bearing adopting the plastic oil lubrication has a series of outstanding advantages of leakage resistance, pollution resistance, acid and alkali medium invasion resistance, shock resistance, swinging working condition resistance, no generation of condensed water, low temperature resistance, long lubrication service life, no maintenance and the like.

In addition, more and more elements can be developed as plastic oil elements made of plastic oil, including but not limited to gears, shafts, sliding sleeves, sealing rings and the like, which can normally fulfill the structural function of the elements, and also have the functions of self-lubricating and providing lubricating oil for contact parts, thereby avoiding the wear of contact pairs, and improving the lubricating life and service life of the elements and other elements in contact with the elements.

When the existing plastic oil bearing and plastic oil element are manufactured, firstly, a plastic oil raw material is manufactured, wherein the plastic oil raw material comprises a polymer base material, lubricating oil, fatty acid salt and a solid lubricant, the other three components except the lubricating oil which is liquid are all fine micro powder, and the four components are uniformly mixed according to a certain proportion to obtain the plastic oil raw material in a viscous fluid state.

However, how to manufacture a solidified plastic oil finished product, namely a plastic oil bearing, from a plastic oil raw material in a viscous fluid state has no public reports on what process route, process parameters and process equipment are adopted. The applicant has tried to manufacture the plastic oil bearing by injecting the raw material of plastic oil in viscous fluid state directly into the bearing, then putting the bearing (containing the plastic oil in fluid state) into the oven to heat and promote the melting of the plastic oil, and then cooling and solidifying, but it has been found that the efficiency is very low and there are quality defects, and it is not suitable or even impossible to manufacture the precision plastic oil bearing, the mineral oil-based and semi-synthetic oil-based plastic oil bearing and the plastic oil bearing with plastic retainer, as detailed in the first method in the following examples. The manufacture of the plastic oil element has the same or similar conditions as the manufacture of the plastic oil bearing, thus seriously restricting the popularization and application of the good technology and products in the market. Therefore, exploring the new manufacturing process and equipment of the plastic oil bearing and the plastic oil element of the utility model is urgent and necessary from any aspect of improving the quality of the plastic oil product, improving the production efficiency of the plastic oil product and expanding the range and application field of the plastic oil product.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a make equipment of attitude oil bearing and make equipment of attitude oil component of moulding to solve production efficiency low, the manufacturing cost is too high that attitude oil stickness fluid state or the called molten state filling forming process method that does not exist, the shaping face unevenness exists the overlap even, mould a series of production and technical quality problems such as the unable assurance quality production of attitude oil product a bit.

The plastic state oil is a microporous oil-containing lubricating material which looks very like plastic, and the name thereof is also derived, but since the pore diameter of the micropores is only 0.5 to 10 μm, the micropores are not at all detected by the naked eye. The plastic oil looks like plastic in appearance, but strictly speaking, the plastic oil is not plastic, and although the raw material of the plastic oil contains polymer, the main component of the plastic oil is lubricating oil (the lubricating oil accounts for up to 50 to 80 percent).

When the plastic oil in the rolling bearing is manufactured, once the plastic oil is manufactured, the plastic oil is inseparable from the bearing, so the manufacturing of the plastic oil means the manufacturing of the plastic oil bearing, and the manufacturing of the plastic oil for the rolling bearing and the manufacturing of the plastic oil rolling bearing are really a matter of one thing and are not distinguished from each other in description.

Although the plastic state oil is not plastic in strict meaning, from the technical characteristics of the injection molding process and the injection molding machine of the present invention, the manufacturing and molding process of the same common commercial plastic product and the commercial injection molding machine have certain commonality and great difference, therefore, the injection molding machine of the present invention can be redesigned and manufactured, and also can be customized and improved from the commercial injection molding machine, and no matter redesigned or improved, due to the particularity of the plastic state oil material and the molding process, the following aspects need to be noted:

(1) the raw materials fed are different

Commercial injection molding machines normally feed the hopper with plastic pellets, while the material fed to the hopper is now a plastic oil in a viscous fluid state. In the barrel, when the barrel is heated, the plastic particles, from entering the barrel to before being injected into the mold by the nozzle, experience the following states as the heating temperature of the barrel is increased in stages: plastic granules → part of plastic granules + part of molten plastic → molten plastic, and the state the plastic oil feedstock undergoes in the barrel is: plastic state oil in viscous fluid state → part of plastic state oil in viscous fluid state + part of plastic state oil in molten state → plastic state oil in molten state. This requires improved sealing of the hopper and barrel of the injection molding machine to ensure that the hopper, barrel and the junction between the hopper and barrel do not leak oil. In addition, the raw material of the plastic oil comprises 3-4 components, the components are in liquid state and powder state, the density of each component is different, the proportion difference is large, and aggregation and precipitation of the components are easy to occur, so that the use performance of the plastic oil is greatly influenced. As the raw material of the plastic oil is in a viscous fluid state, dust particles are easily adsorbed, the pollution of the plastic oil is caused, and the use performance of the plastic oil is affected, therefore, a cover is added on the hopper, and the cover is added on the opening part of the charging barrel.

(2) Heating time and temperature of the cartridge

Since the plastic oil is not plastic in a strict sense, the melting temperature of the plastic oil is different from that of all known plastics and is not completely equal to the oven temperature of the existing process when an oven is used for melting and curing. The heating temperature and the heating time of each section of the charging barrel are determined according to the physical and chemical characteristics of the plastic oil with different formulas, and the final purpose is only one: the plastic oil can reach a complete molten state at the tail end of the charging barrel (namely close to the nozzle end), and the adopted temperature and time do not damage the physical and chemical properties of the components of the plastic oil. Because the raw material of the plastic oil is directly exposed in the heated charging barrel and is heated in sections, the plastic oil is heated fully and uniformly, and therefore, the heating temperature of the charging barrel is slightly lower than that of the oven in order to ensure that the plastic oil is in a complete molten state; the heating time of the charging barrel is shortened by times compared with that of an oven, which is of great significance for improving the production efficiency and protecting lubricating oil (especially mineral oil and semi-synthetic oil) in plastic oil from high-temperature oxidation.

(3) Selection of injection molding machine

The injection molding machine is generally classified into a vertical injection molding machine, a horizontal injection molding machine, and an angle injection molding machine, and the vertical injection molding machine is preferable in view of structural characteristics of the bearing and a need to prevent a collision damage.

Considering that the plastic oil raw material composition is mainly lubricating oil and is the viscous fluid state, the piston injection molding machine is because there is not the screw rod idle running to skid, takes not material loading scheduling problem, consequently, still does one of the options of the utility model.

The problems of idle and slipping of the screw and no material loading of the screw are caused in the commercial screw injection molding machine aiming at the plastic oil raw material, so the improvement is needed. The utility model discloses an improve the screw rod compression ratio, reduce measures such as clearance between screw rod and the feed cylinder and avoid the screw rod idle running to skid, take not material loading or take the not enough problem of material, specifically do: the compression ratio of the design parameter of the screw is more than 4, and the clearance between the screw and the charging barrel is 0.001 to 0.003 times of the outer diameter of the screw.

(4) Different die

When the plastic oil bearing is manufactured, the plastic oil finally flows into the inner cavity of the bearing, so that a concave cavity for placing the bearing is arranged on a bottom die of an injection molding die.

The gaps among the rolling body, the retainer and the ferrule in the bearing are narrow, and it is not easy to fill the bearing inner cavity with molten plastic oil, so that a plurality of feeding small holes are additionally arranged on the middle die along the circumferential direction of the bearing, and the feeding holes simultaneously fill the bearing inner cavity with the molten plastic oil along the circumferential direction of the bearing.

The plastic oil bearing has self-sealing performance because the plastic oil is filled in the inner cavity of the bearing. In many occasions, however, in order to further improve the dustproof sealing performance of the bearing, the plastic oil bearing is still required to be provided with sealing parts on two sides, and when the sealing parts are not arranged, the free space in the bearing is a free space enclosed by two end faces of the bearing; when the sealing elements are pressed on the two sides, the free space in the bearing is the free space surrounded (or limited) by the two sealing elements. In order to fill the free space limited by the sealing ring with the molten plastic oil, the bottom die and the middle die are provided with limiting bosses.

In the first method of the embodiment, after injecting the plastic oil raw material in a viscous fluid state into the bearing, the raw material is put into an oven to be heated and melted at a temperature between 140 and 180 degrees, which has several problems: (1) the plastic oil in the surface position is oxidized to a certain extent due to poor heating conditions of the plastic oil, the time required for melting through is too long, generally 30 to 90 minutes, and the situation is particularly prominent for the plastic oil made of mineral oil and semi-synthetic oil, and because the melting temperature exceeds the upper limit of the working temperature of the plastic oil and the semi-synthetic oil, the method is not suitable for manufacturing plastic oil bearings and plastic oil components which take the mineral oil and the semi-synthetic oil as base oil; (2) the bearing passively bears the melting temperature which is similar to or even higher than the self tempering temperature and longer melting time, and the ferrule can generate micro deformation, which is a problem for precision bearings; in addition, because the melting temperature exceeds the upper limit of the working temperature of a plastic retainer (such as PA66), and the melting time is long, the plastic retainer can deform and age to cause the clamping stagnation of the bearing, therefore, the process method of injecting and molding the plastic oil in a viscous fluid state cannot manufacture the bearing with the plastic retainer, and the application of the plastic oil in partial bearings is limited.

The utility model discloses a plastic state oil molten state high pressure injection molding process and equipment, the stickness fluid plastic state oil raw materials and plastic state oil melting temperature of embodiment one, adopt the utility model the injection molding machine (brand-new design preparation or improved by current commercial injection molding machine) and injection molding mould, when making the plastic state oil bearing, will mould the state oil heating melting back high pressure injection and put into the bearing cavity of placing in the mould, through cooling hardening and stereotyped, make porous oily lubricating material plastic state oil in the bearing and make into plastic state oil bearing promptly, like this, the total time of injection molding of single set plastic state oil bearing and single plastic state oil component is generally only about 1 minute, and the total time of bearing and high temperature molten plastic state oil contact is injection time plus the dwell time, generally only about 15 seconds, so, two major technical quality problems that embodiment 1 exists have been avoided, the method can be used for manufacturing precise plastic oil bearings and plastic oil bearings with plastic retainers, and the base oil in the plastic oil adopts mineral oil and semisynthetic oil without problems.

The molten state high pressure injection molding process, equipment and mould of the plastic state oil element, including the pure plastic state oil element and the plastic state oil element with the metal insert, are the same as or similar to the plastic state oil bearing, and are not repeated herein.

Drawings

FIG. 1 is a schematic view of the first plastic oil raw material filling of the present invention;

FIG. 2 is a schematic diagram of a manufacturing apparatus for a plastic oil bearing according to the present invention;

FIG. 3 is a schematic view of a molten high-pressure injection molding process for plastic oil in the plastic oil bearing of the present invention;

FIG. 4A is a schematic view of a bottom mold;

FIG. 4B is an illustration of a middle mold near the bottom mold;

FIG. 4C is an exemplary view of a middle mold near the top mold;

fig. 4D is a schematic diagram of the upper die.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

To better illustrate the present invention, the experimental route that the applicant has gone through in the process of manufacturing the plastic oil bearing or the element will be described.

First Experimental protocol

Fig. 1 is a schematic diagram of the present invention, wherein 11 is a bearing, 12 is plastic oil, and is represented by a flowing arrow, 13 is a lower block, and 14 is an injection head. Cleaning and drying the bearing 11 for preparation; preparing a plastic oil raw material 12 in a viscous fluid state, and waiting for filling into the bearing 11; manufacturing a lower block 13, preventing the plastic oil 12 from leaking from the bearing when the plastic oil raw material 12 is filled into the bearing 11 and is in a molten state before the plastic oil raw material 12 is completely solidified, and meanwhile, a boss on the lower block 13 also has the functions of adjusting and controlling the position of the lower liquid level of the plastic oil 12; the material injection head 14 is manufactured, the material injection head 14 is similar to a grease injection head used for filling grease, a plurality of material injection small holes are uniformly distributed along the circumferential direction of the material injection head 14, and when material is added, the small holes discharge materials simultaneously, so that the material adding efficiency is improved.

The bearing 11 is placed on the lower block 13, the injection head 14 moves downwards to the position to seal the bearing 11 from the upper side, then the raw material 12 of the plastic oil is injected until the raw material 12 of the plastic oil fills the inner cavity of the bearing 11 limited by the lower block 13 and the upper injection head 14, and the boss on the injection head 14 has the functions of adjusting and controlling the position of the liquid level on the plastic oil 12.

After the material is injected, the injection head 14 is lifted to separate from the bearing, the bearing 11 (together with the plastic oil raw material 12 in the inner cavity of the bearing) and the assembly of the lower blocking block 13 are placed in a flat oven and heated to be melted at the temperature of 140-180 ℃, the specific melting temperature and time are determined according to the factors of the plastic oil formula, the size of the bearing, the charging amount and the like, the melting time required by the miniature bearing is generally 30 minutes, the melting time required by the miniature bearing is 60 minutes or more in the medium-large scale, the assembly is taken out of the oven and is naturally cooled, the plastic oil 12 is formed by cooling and hardening in the melting state, the plastic oil fins and burrs are cut off, the formed plastic oil is prepared, and meanwhile, the plastic oil bearing is obtained. In the case of the sealed bearing shown in fig. 1, the sealing member is installed after the plastic oil is formed.

In general, the manufacturing of the plastic oil bearing in this example includes four steps, and the specific sequence is as follows:

step 1 (preparation) → step 2 (charging) → step 3 (heating and melting) → step 4 (cooling and setting) → step 5 (cutting off flash of molten plastic oil)

It can be seen that the process route for manufacturing the plastic oil bearing is not long, but two outstanding problems exist: (1) the four working procedures are completed by adopting different devices at four stations, the working procedures are not connected, and the manual operation links are many; (2) the process 3 takes too long. The two problems directly cause low manufacturing efficiency of the plastic state oil bearing, higher manufacturing cost, appearance defects, incapability of manufacturing precise plastic state bearings, precise plastic state oil elements, plastic state oil bearings with plastic retainers and the like, and seriously affect the popularization and application of the plastic state oil lubrication technology.

Therefore, the utility model discloses the people just discovers that laboratory or little trial run of the process of moulding attitude oil bearing industrialization and makes its attitude oil bearing that moulds have foretell problem, unable high efficiency mass production, the state oil outward appearance of moulding and internal quality are unsatisfactory and because this scheme can lead to some bearings still can't adopt the lubricated scheme of the state oil of moulding to bearing ring and plastics holder's precision and quality production negative effects. For this reason, utility model people adopts multiple scheme through many times of several years's experiments, when considering to adopt the production that improves commercial injection molding machine and realize moulding attitude oil bearing, need break thinking inertia, need experimental verification even: (1) compared with the first scheme, the published report that the plastic state oil is injected into the bearing inner cavity or the mold cavity in a molten state never appears at home and abroad, the plastic state oil obviously undergoes different chemical reaction temperatures and times, particularly reaction time, the molding condition of the plastic state oil is required to be compared, and the molded plastic state oil bearing is required to be compared with the dynamic durability lubrication life of the plastic state oil bearing manufactured by the first scheme; (2) the raw materials fed by the commercial injection molding machine are generally plastic particles, even if the plastic particles are wet, the plastic particles are not allowed, because the process difficulty and the increase of defective products are caused, and the raw materials of the plastic particle lubricating device are fluid lubricants; the finished product of the commercial injection molding machine is generally solid plastic, while the finished product of the utility model is a porous oil-containing lubricating material, wherein the content of the lubricating oil is the first proportion; when a commercial injection molding machine is used for manufacturing plastic products, plastic particles are heated in a charging barrel to experience glass state, high elastic state and viscous flow state; the plastic oil raw material of the utility model is in completely different states after passing through the hopper feeding cylinder, and can be divided into a semi-molten state (partial melting, and partial still viscous fluid state) and a fully molten state (molten state for short). And the people has done the analysis of reality, verification work in these respects, with commercial injection moulding machine according to the utility model improve, adopt the plastic state oil melt state high pressure injection moulding process method, can produce plastic state oil bearing and plastic state oil component high-efficiently, high-quality ground. A commercial injection molding machine is a main molding apparatus for molding thermoplastic plastics or thermosetting plastics into plastic products of various shapes using a plastic molding die. It is divided into vertical type, horizontal type and angle type. Commercial injection molding machines can heat plastic pellets and apply high pressure to the molten plastic to cause it to be ejected and fill the mold cavity. The last product of the commercial injection molding machine is a molded plastic product which is solid, and the final product of the commercial injection molding machine, namely a plastic oil bearing (plastic oil in the plastic oil bearing) or a plastic oil element, is a porous oil-containing lubricating material, wherein the oil content is as high as 50-80%, the product is similar to plastic in appearance, but the physical and chemical properties of the product are different from those of the plastic, so that the product is also a scheme which is found after a plurality of tests and can be produced in mass and ensure the quality, and the product is an innovation with cross-industrial significance.

In addition, this department reforms transform with commercial injection molding machine and explains the utility model discloses a preparation equipment, but is not used for limiting the utility model discloses, the one set of preparation equipment of also can independent development of the utility model, as long as realize the function can.

Second embodiment

Please refer to fig. 2, which is a schematic diagram of a manufacturing apparatus for a plastic oil bearing. It includes: an injection subsystem, a mold closing subsystem, a heating subsystem and a control unit, wherein,

and the injection subsystem comprises a melting device 11 and a power transmission device 12, the melting device 11 comprises a feeding device 111 for containing and mixing the plastic oil raw materials and a charging barrel 112 for containing and heating the plastic oil raw materials in flowing, the end part of the charging barrel is provided with a high-pressure injection opening 113, and the power transmission device 12 comprises an injection power driving device 122 and an actuating mechanism 121 for injecting the molten plastic oil into the inner cavity of the bearing (the bearing is placed in the mold) under high pressure. The feeding device 111 can be an automatic feeding device, or can manually feed the mixed plastic oil raw materials into the feeding device. The barrel 112 may be a container for flowing the plastic oil material, for example, the barrel 112 may be vertically placed, and the plastic oil material may be flowed by a power mechanism and gravity. The barrel 112 may also be horizontally positioned and a power mechanism may be added to cause the plastic oil feedstock to flow in a horizontal direction. The end of the charging barrel 112 is provided with a high-pressure injection nozzle 113, which may be a nozzle or other interface components capable of injecting molten plastic oil into a mold under high pressure. The actuator 121 may be a screw or a plunger, and the injection power driving device 122 may be an injection cylinder, an injection seat moving cylinder, a screw driving device, or the like, so that the actuator 121 provides power to the actuator 121 by injecting the molten plastic oil into the mold under high pressure.

The mold closing subsystem 20 comprises a bearing inner cavity mold cavity 22 which is pre-filled with an oil bearing to be injected, and a mold closing driving device 21 for opening/closing the mold;

the heating subsystem 30: which may be located either externally or internally within barrel 112, serves to stage or progressively heat the plasticized oil feedstock within the barrel so that it transitions the feedstock from a viscous fluid state to a partially molten state and from the partially molten state to a fully molten state (referred to simply as the molten state) before reaching the high pressure injection jet.

The control unit 40: the system is used for controlling the heating temperature and time of the heating subsystem 20 to heat the raw materials to a high-pressure injection port to form molten plastic oil, and controlling the injection pressure of the injection power driving device to enable the speed and the pressure of the injection of an execution mechanism to enable the molten plastic oil to be injected into the bearing cavity mold cavity, namely to be placed in the bearing cavity of the mold cavity.

The utility model discloses an equipment can also include the hydraulic drive subsystem, and its effect realizes that injection molding machine provides power according to the required various actions of technological process to satisfy the requirement of each partial required pressure of injection molding machine, speed, temperature etc.. It is mainly composed of respective hydraulic components and hydraulic auxiliary components, wherein the oil pump and the motor continue to use the power source of the commercial injection molding machine. Various valves control the pressure and flow of the oil, thereby meeting various requirements of the injection molding process.

The utility model discloses an equipment can also include the electrical control subsystem, and its electrical control subsystem rationally cooperates with the hydraulic drive subsystem, can realize the technological process requirement (pressure, temperature, speed, time) and the various procedure actions of injection machine. The device mainly comprises an electric appliance, an electronic element, an instrument, a heater, a sensor and the like. Generally, there are four control modes, manual, semi-automatic, full-automatic and adjustment.

The utility model discloses an equipment can be direct water-cooling, also can include the cooling subsystem, be used for right the mould carries out the cooling including the water-cooling, makes the state oil of moulding that fills the bearing inner chamber fully harden from the molten state and stereotype because of the cooling.

The mold closing subsystem also comprises a demolding device which is used for opening the mold to eject or take out the bearing from the mold to prepare the plastic oil and correspondingly prepare the plastic oil bearing.

And a stirring device can be arranged in the hopper so as to ensure that all the components of the plastic oil raw material in the hopper are always in a uniform dispersion state.

The plastic oil raw material can comprise 20-40 wt%, 50-80 wt%, 0.1-1.5 wt% and 0-1 wt% of polymer base material, lubricating oil, fatty acid salt and solid lubricant, wherein the lubricating oil comprises mineral oil, synthetic oil and semisynthetic oil formed by mixing mineral oil and synthetic oil according to a certain proportion. Including industrial grade lubricating oil, food grade lubricating oil and food grade antibacterial lubricating oil.

The utility model relates to a process for manufacturing of moulding attitude oil bearing for through injection moulding, include:

s1: mixing and heating a plastic state oil raw material comprising a polymer base material, a lubricating oil, a fatty acid salt and a solid lubricant so that the raw material is heated from a plastic state oil in a viscous fluid state and a part of molten state plastic state oil to high-pressure molten state plastic state oil at a high-pressure injection port respectively;

s2: injecting the molten plastic oil into at least one bearing inner cavity mold cavity through the high-pressure injection nozzle, wherein the bearing inner cavity mold cavity is pre-filled with a bearing to be subjected to plastic oil, and the bearing inner cavity is filled with the molten plastic oil through an injection passage under the action of injection force;

s3: cooling, hardening and shaping to obtain the plastic oil bearing containing the porous oil-containing lubricating material and having the micropore diameter of 0.5-10 microns.

High pressure injection molding is preferred, and is illustrative only, with respect to the injection pressures used in grease injection in the bearing industry, injection pressures used in injection of plastic oils in viscous fluid states, and injection pressures used in commercial injection molding machines for manufacturing general plastic articles. During injection, the bearing cavity is filled with molten plastic oil, and therefore, the flow resistance of all parts passing through the bearing cavity, especially the flow resistance in the bearing cavity, needs to be overcome. Because the contact between the rolling body and the raceway in the bearing is high, the gaps at each position are small, and the injection is rapid, the flow resistance of the plastic oil in the bearing is higher than that in a common injection molding die, so that the high injection pressure, namely high-pressure injection, is naturally required, for example, over 140bar, the actual injection pressure is determined according to the type, size, structure, clearance of the bearing, the formula of the plastic oil and the like, for example, the injection pressure for manufacturing a plastic oil full needle bearing without a retainer is higher than that for manufacturing a plastic oil needle bearing with a retainer.

Step S1 further includes:

s11: mixing and adding plastic oil raw materials including polymer base materials, lubricating oil, fatty acid salts and solid lubricant in a viscous fluid state into a feeding mechanism;

s12: heating the plastic oil raw material in the sectional mode or heating gradually, determining the heating temperature and heating time of each section according to the physical and chemical characteristics of the plastic oil and the speed of the plastic oil raw material advancing to the injection nozzle, so that the plastic oil reaches a molten state at the high-pressure injection nozzle and the lubricating oil in the plastic oil is not in a high-temperature oxidation state, and

and stirring the plastic oil raw material in the sectional heating process so as to ensure that all components of the plastic oil raw material are in a uniform dispersion state.

The sectional heating of the plastic state oil raw material is performed in a charging barrel of an injection molding machine in a sectional manner, the heating temperature of the barrel wall of the charging barrel is sequentially increased from one end of the charging barrel close to a hopper of a charging mechanism to one end of the charging barrel close to a nozzle of high-pressure injection, the final heating temperature range is 140-180 ℃, the plastic state oil raw material is in a complete molten state, and joints among the hopper, the charging barrel and the nozzle are high-temperature resistant and oil-tight.

Step S2 further includes (as will be described in detail below):

presetting a preset insert, wherein the preset insert comprises a bottom die, a middle die and an injection molding die of an upper die, a feeding port of the upper die can be tightly attached to a nozzle, a recess for placing the pre-molding oil bearing is arranged on the bottom die, an annular boss for limiting the lower surface of the molding oil of the bearing with the seal to not exceed the position of a seal groove in the middle die is placed in the recess, a plurality of small injection holes distributed along the circumference are arranged on one side of the annular boss close to the bottom die, groove runners distributed radially along the circumference are distributed on one side of the middle die close to the upper die, and the small injection holes are respectively positioned in the groove runners;

the molten plastic oil is pushed by a screw or a plunger of an injection molding machine and injected into a closed injection molding die through a nozzle at the end of a charging barrel, enters a bearing inner cavity arranged in the closed die through a die runner, and is filled in the bearing inner cavity through pressure maintaining, and an injection port of the upper die, a groove runner radially distributed along the circumference and the plurality of small injection holes form injection passages respectively so as to simultaneously fill the bearing inner cavity with the molten plastic oil along the circumferential direction of the bearing by utilizing the small injection holes.

S3: the cooling hardening and setting can further comprise:

s31: cooling and shaping: the plastic oil in the inner cavity of the bearing in the mold is hardened and shaped from a molten state due to cooling through natural cooling or water cooling of the mold, and the shape given by the inner cavity of the bearing is kept;

s32: demolding: and demolding to obtain the plastic oil bearing.

The method can also comprise the following steps: the bearing is preheated in advance before being placed in an injection molding die, and the preheating temperature does not exceed the highest heating temperature adopted by the heating of the charging barrel.

The plastic oil bearing comprises any type and precision plastic oil bearing, and particularly comprises a precision plastic oil bearing with the precision of P5 and above and a plastic oil bearing with a plastic retainer.

Examples

As described above, the present invention provides a molten plastic oil high pressure injection molding process with an improved commercial injection molding machine, preferably a vertical injection molding machine. The present invention will be described in detail by taking a molten state high pressure injection molding process of a plastic oil bearing as an example.

Fig. 3 is a schematic diagram of the melting state high-pressure injection molding process of the plastic state oil in the plastic state oil bearing of the present invention, and fig. 3 includes four major parts, a vertical screw injection molding machine 21, an injection molding die 22, a bearing 23 and plastic state oil 24. The plastic oil 24 is represented by the flow arrows. The injection molding die 22 includes a lower die (or bottom die) 221, an intermediate die 222 and an upper die 223, which are respectively enlarged and shown in fig. 4A to 4D, and fig. 4A to 4D are only used for illustrating some features of the upper surface of the die, and are not engineering drawings for the production and processing of the die.

The configuration, operation and parameter setting principle of the vertical screw injection molding machine 21 is the same as that of a general commercial vertical screw injection molding machine, and a part particularly directly related to the plastic state oil injection molding is described here with emphasis. 211 is a hopper, 212 is a stirring device in the hopper, 213 is a charging barrel, also called a gun barrel, 214 is a heating ring of the charging barrel, 215 is a propelling screw and 216 is a nozzle. The injection molding die 22 includes a lower die 221, an intermediate die 222, and an upper die 223, and the injection molding die 22 is placed on a horizontal work surface of the injection machine 21. The bearing 23 may be any type and size of rolling bearing that is placed in the cavity of the bottom mold 221 prior to injection. The plastic oil feedstock 24 is fed from hopper 211 through barrel 213, nozzle 216 and die 22 into bearing 23, during which the plastic oil 24 undergoes a series of physical and chemical changes.

The following is explained according to the process flow of the molten high-pressure injection molding process method of the plastic oil bearing:

(1) melting the plastic oil: the plastic oil material 24 in a viscous fluid state is fed into the hopper 211 of the injection molding machine 21, and is fed from the hopper 211 into the heated cylinder 213, and the plastic oil material 24 is heated to be in a molten state.

To prevent the plastic oil raw material 24 in the hopper 211 from settling, a stirring device 212 is installed in the hopper 211. The heating temperature of the lower end of the charging barrel 213, namely the end of the nozzle 216, is set to the temperature required for melting the plastic oil raw material 24, which is a temperature point between 140 and 180 degrees under the influence of the plastic oil formula. The plastic oil raw material 24 in a viscous fluid state is sent into the charging barrel 213 through the fluidity and self weight of the plastic oil raw material 24 and the principle of screw 215 material return, and physical and chemical changes occur due to high-temperature conduction of the charging barrel 213 and heat generated by shearing and extrusion of the screw 215, so that the plastic oil raw material reaches a molten state. Meanwhile, during this process, the plastic oil 24 is sheared and compressed by the screw 215 to make its density and viscosity uniform, ready for high pressure injection into the mold 22 through the nozzle 216.

(2) Injecting and filling a mold: the plastic oil 24 in a molten state is pushed by the screw 215 and injected into the closed mold 22 through the nozzle 216 at the end of the cylinder, and enters the cavity of the bearing 23 placed in the closed mold 22 through the mold runner to fill the cavity of the bearing 23 by pressure holding.

Since the plastic oil bearing is manufactured by molding the plastic oil 24 in the inner cavity of the bearing 23, rather than in the shaping cavity of the injection mold 22, the injection mold 22 should be modified and adjusted according to the specific situation, so that not only the bearing 23 can be placed in the inner cavity of the mold 22, but also the molten plastic oil 24 can be smoothly injected into and fill the inner cavity of the bearing 23. The following description will be made of a single cavity injection molding die 22 actually developed by the applicant.

Fig. 4A shows a bottom mold 221 of the plastic oil bearing injection mold 22, on which a recess 231 for placing the bearing 23 is formed. The annular projection 232 in the recess 231 is used for limiting the position of the lower surface of the plastic oil of the bearing with the seal not to exceed the position of the sealing groove, so that after the plastic oil is formed and the seal is pressed, the seal and the plastic oil are not contacted and interfered on the lower side surface of the bearing.

Fig. 4B shows the lower part of the middle mold 222, and it can be seen that an annular boss is formed thereon to limit the position where the upper surface of the plastic oil of the bearing with a seal does not exceed the position of the seal groove, so that the seal ring and the plastic oil do not contact and interfere with each other on the upper side surface of the bearing after the plastic oil is formed and the seal ring is pressed. The annular boss is provided with a plurality of small injection holes 2221 distributed along the circumference, and the purpose is to shorten the flow path of molten plastic oil in the inner cavity of the bearing and improve the injection efficiency and the molding quality. These orifices are distributed within circumferentially radially spaced groove channels 2223 as viewed from above the die 222 in fig. 4C.

Fig. 4D is an upper die. The upper mold sprue is designed to fit snugly against the barrel nozzle 216 and, therefore, is designed with a tapered socket 2222.

The injection molding mold determines a specific dwell time according to the formulation of the plastic oil 24 and the specific type and size of the bearing 23 to ensure that the defined free space inside the bearing is filled with the plastic oil in a molten state.

(3) Cooling and shaping: the plastic oil 24 filling the bearing cavity is hardened and formed by cooling from a molten state through natural cooling or water cooling of the mold 22.

The natural cooling or the water cooling is adopted according to the size of the bearing 23, the plastic oil in the molten state is cooled to be hardened and formed, and the fluidity is lost, and at the moment, the oil is contained in the micropores inside the plastic oil 24, so that the plastic oil is a porous oil-containing lubricating material.

(4) Opening the mold: opening the mould to eject or take out the bearing 23 from the mould 22 to obtain plastic oil 24 and correspondingly obtain a plastic oil bearing;

and opening the mold, and ejecting or taking out the bearing 23 from the mold 22 to obtain the plastic oil 24 and correspondingly obtain the plastic oil bearing. And (4) adding a sealing ring to the sealed bearing to obtain the sealed plastic oil bearing.

The plastic oil bearing manufacturing method is adopted to manufacture a complete process cycle of the plastic oil bearing by the plastic oil molten high-pressure injection molding process method, and the plastic oil bearing can be manufactured in batches by the cycle.

The total time of the whole process cycle is not more than 60 seconds, and the total time from the injection of the plastic oil in the high-temperature molten state into the bearing to the end of the pressure maintaining is not more than 15 seconds.

In the above example, only one mold cavity is provided inside the mold, one set of bearings is placed at a time, and one set of plastic oil bearings is manufactured in one injection molding cycle.

The embodiment provides a molten state high-pressure injection molding process method of plastic state oil in a plastic state oil bearing, and the molten state high-pressure injection molding process method of the plastic state oil of a pure plastic state oil element and an embedded plastic state oil element is the same or similar to the pure plastic state oil element and the plastic state oil with the embedded plastic state oil element, but the design and the manufacture of an injection molding mold do not need to consider the link of placing a rolling bearing, and the design of a conventional injection molding mold is more similar, and a mold cavity is designed and manufactured according to the shape of the plastic state oil element.

Third scheme

The plastic state oil molten state high-pressure injection molding process and the equipment have the advantages. Put back one step, adopt injection moulding equipment, when the attitude oil bearing was moulded in the preparation, even if mould attitude oil and not melt the state injection, but inject under the stickness fluid state, still have the efficiency advantage than above-mentioned first test scheme: the heating system of the high-pressure injection molding equipment is turned off, viscous fluid plastic oil raw material is directly injected into the inner cavity of the bearing placed in the injection molding mold under high pressure, and then the bearing is taken out of the injection molding machine (such as an oven) to be heated, melted and solidified to manufacture the plastic oil bearing. Because, firstly, the high-pressure injection efficiency is higher; secondly, a plurality of sets of bearings can be placed in the injection molding die for plastic oil injection. The following is a detailed description of the scheme (the scheme of direct high-pressure injection molding or normal-temperature injection molding of the viscous fluid state plastic oil raw material).

The manufacturing equipment of the plastic oil bearing comprises an injection machine and a heating device, wherein the injection machine further comprises an injection subsystem, a mold closing subsystem and a control unit,

the injection subsystem comprises a melting device and a power transmission device, the melting device comprises a feeding device for containing plastic oil raw material mixture and a charging barrel for containing flowing plastic oil raw material, a high-pressure injection opening is formed in the end part of the charging barrel, the power transmission device comprises an injection power driving device and an execution mechanism, the injection power driving device and the execution mechanism are used for injecting the high-pressure molten plastic oil into the bearing inner cavity mold cavity, and a heating system of the melting device is closed;

the mold closing subsystem comprises a bearing inner cavity mold cavity which is pre-filled with an oil bearing to be injected, and a mold closing driving device for opening/closing the mold;

the control unit is used for controlling the injection pressure of the injection power driving device, so that the injection speed of an actuating mechanism of the control unit can enable high-pressure molten state plastic state oil to be injected into the bearing inner cavity mold cavity;

a heating device: and ejecting or taking out the blocking block together with the bearing and putting the blocking block into the heating device for heating, wherein the heating temperature range is 140-180 ℃, so that the plastic oil raw material is in a molten state.

The apparatus may further include: and the cooling device is used for cooling the bearing taken out of the heating device, the plastic oil is hardened and shaped due to cooling from a molten state to prepare the plastic oil and correspondingly prepare the plastic oil bearing, and the plastic oil bearing containing the porous oil-containing lubricating material and having the diameter of a micropore of 0.5-10 microns is prepared.

A manufacturing process of a plastic oil bearing is used for manufacturing the plastic oil bearing by a plastic oil normal-temperature injection molding process, and further comprises the following steps:

s1: mixing a plastic oil raw material to a high-pressure injection port, injecting the plastic oil into at least one bearing inner cavity mold cavity through the high-pressure injection port, wherein the bearing inner cavity mold cavity is pre-filled with a bearing to be filled with viscous fluid plastic oil, the viscous fluid plastic oil is filled in the bearing inner cavity through an injection passage under the action of injection force, and the bearing is a bearing with a block at the lower end;

s2: after the mold is opened, ejecting or taking out the blocking block together with the bearing and putting the blocking block into a heating device for heating, wherein the heating temperature range is 140-180 ℃, so that the plastic oil raw material is in a molten state;

s3: taking out the oil from the heating device and cooling, hardening and shaping the plastic oil from the molten state due to cooling to obtain the plastic oil and correspondingly obtain the plastic oil bearing, and thus obtaining the plastic oil bearing containing the porous oil-containing lubricating material and having the diameter of micropores of 0.5-10 microns.

S1 further includes: presetting a preset insert, wherein the preset insert comprises a bottom die, a middle die and an injection molding die of an upper die, a feeding port of the upper die can be tightly attached to a nozzle, a recess for placing the pre-molding oil bearing is arranged on the bottom die, an annular boss for limiting the lower surface of the molding oil of the bearing with the seal to not exceed the position of a seal groove in the middle die is placed in the recess, a plurality of small injection holes distributed along the circumference are arranged on one side of the annular boss close to the bottom die, groove runners distributed radially along the circumference are distributed on one side of the middle die close to the upper die, and the small injection holes are respectively positioned in the groove runners;

the plastic oil raw material in a viscous fluid state is pushed by a screw or a plunger of an injection molding machine and is injected into a closed injection molding die through a nozzle at the end part of a charging barrel, the oil enters a bearing inner cavity arranged in the closed die through a die runner, the bearing inner cavity is filled with the oil through pressure maintaining, and an injection port of the upper die, a groove runner distributed radially along the circumference and the plurality of small injection holes form an injection passage respectively so as to be simultaneously filled into the bearing inner cavity along the circumferential direction of the bearing by utilizing the small injection holes.

The normal temperature injection molding process of the plastic oil bearing and the plastic oil element can adopt the injection molding machine and the injection molding die which are injected and molded in the molten state, and only needs to be adjusted correspondingly, because the melting and the solidification molding of the plastic oil raw material are not completed on the injection molding machine, but completed in an oven and other places outside the injection molding machine, therefore, a heating temperature switch of a charging barrel is closed, a cooling switch of the die is closed, and a plugging block or a plate is arranged below the bearing and the molding die of the plastic oil element, so that the plastic oil raw material in a viscous fluid state or the plastic oil in the molten state before solidification is prevented from leaking. Because normal atmospheric temperature injection moulding is not the utility model discloses preferential technical scheme, in addition just utilized injection moulding machine and injection moulding mould's high-pressure injection to annotate the material, improve and annotate the material quality and annotate material efficiency, and the natural cooling solidification outside later oven melting and the oven is with test method one, consequently no longer gives unnecessary details.

The material that is different from current injection moulding machine feeding is plastic pellet, the utility model discloses the material of injection moulding machine feeding is the plastic state oil raw materials of stickness fluid state, and this raw materials includes 3 to 4 components, accounts for than the highest component to be lubricating oil, and the high component of second is powdered polymer, consequently, whole process both prevents to reveal, also prevents the gathering and the sediment of individuality component, and this just requires to prevent everywhere to leak the sealing to commercial injection moulding machine, installs homogenization agitating unit in the hopper. When the screw injection molding machine is adopted, because the plastic oil raw material is a fluid lubricating material, the screw in the prior art inevitably slips and cannot carry materials, so that the screw is specially modified, the design parameter compression ratio is more than 4, and the clearance between the screw and the charging barrel is 0.001-0.003 times of the outer diameter of the screw, so that the screw cannot slip and cannot carry materials when in work.

Adopt the plastic state oil raw materials, this raw materials include polymer substrate, lubricating oil, aliphatic acid salt and solid lubricant, the weight accounts for the ratio and is 20 ~ 40%, 50 ~ 80%, 0.1 ~ 1.5% and 0 ~ 1% respectively, wherein lubricating oil includes mineral oil, synthetic oil and mineral oil and the semi-synthetic oil that synthetic oil formed according to the proportional mixing, including industrial level lubricating oil, food level lubricating oil and food level antibacterial lubricating oil. Use modified injection molding machine and injection molding mould, adopt the feed cylinder heating temperature wait injection molding process parameter, just can make the porous oily lubricating material-the attitude oil of moulding of micropore diameter at 0.5 micron to 10 microns, including moulding the attitude oil component and moulding the attitude oil bearing.

The utility model discloses can make other attitude oil components with similar principle.

A process for manufacturing a plastic oil element by high-pressure injection molding, comprising:

s1: mixing and heating the raw materials of the plastic state oil so that the raw materials are respectively heated from the plastic state oil in a viscous fluid state and part of molten state plastic state oil to high-pressure molten state plastic state oil at a high-pressure injection port;

s2: injecting the molten plastic oil into a mold cavity with at least one mold cavity through the high-pressure injection nozzle, wherein the size and the shape of the mold cavity are determined by the size and the shape of a plastic oil element;

s3: cooling, hardening and shaping to obtain the porous oil-containing lubricating material and the plastic oil element with the micropore diameter of 0.5-10 microns.

S3: the cooling hardening and shaping further comprises the following steps:

s31: cooling and shaping: the plastic oil in the die cavity is hardened and shaped from a molten state due to cooling through natural cooling or water cooling of the die, and the shape given by the die cavity is kept;

s32: demolding: demoulding to obtain the plastic oil element.

An apparatus for manufacturing a plastic oil member, comprising: an injection subsystem, a mold closing subsystem, a heating subsystem and a control unit, wherein,

the injection subsystem comprises a melting device and a power transmission device, the melting device comprises a feeding device for containing and mixing plastic oil raw materials and a charging barrel for containing and heating the plastic oil raw materials in flowing, the end part of the charging barrel is provided with a high-pressure injection port, and the power transmission device comprises an injection power driving device and an execution mechanism for injecting the high-pressure molten plastic oil into the mold cavity;

the mold closing subsystem comprises a mold cavity designed according to the size and the shape of a plastic oil element and a mold closing driving device for opening/closing the mold;

a heating subsystem: the device is arranged outside or inside the charging barrel and is used for heating the raw material of the plastic oil in the charging barrel in a sectional manner or step by step so as to respectively heat the raw material from the plastic oil in a viscous fluid state and part of the molten plastic oil to the high-pressure molten plastic oil at the high-pressure injection port;

a control unit: the injection power driving device is used for controlling the heating temperature and time of the heating subsystem to heat the raw materials to high-pressure injection nozzles to form high-pressure molten plastic oil, and controlling the injection pressure of the injection power driving device to enable the injection speed of the execution mechanism to enable the molten plastic oil to be injected into the mold cavity under high pressure.

The plastic oil element can be manufactured by adopting a normal-temperature injection molding process as well as a normal-temperature injection molding process when manufacturing the plastic oil bearing, but the efficiency and the quality are not as good as those of the molten-state high-pressure injection molding process and the quality, and particularly, the plastic oil element forming die is required to be placed in an injection molding die in advance, and the forming die is similar to the bearing when manufacturing the plastic oil bearing. The normal-temperature injection molding process of the plastic oil element specifically comprises the following steps:

s1: mixing a plastic oil raw material to a high-pressure injection port, injecting the plastic oil in a viscous fluid state into at least one plastic oil element forming die which is placed in an injection forming die in advance through the high-pressure injection port, and filling the plastic oil in the viscous fluid state into an inner cavity of the element forming die through an injection passage under the action of injection force;

s2: after the mould is opened, ejecting or taking out the element forming mould together and putting the element forming mould into a heating device for heating, wherein the heating temperature range is 140-180 ℃, so that the plastic oil raw material is in a molten state;

s3: taking out the plastic oil element from the heating device and cooling, hardening and shaping the plastic oil element from a molten state due to cooling, and taking out the plastic oil element from a plastic oil element forming die to obtain the plastic oil element with porous oil-containing lubricating material and the diameter of micropores of 0.5-10 microns.

As can be seen from the examples, the method and apparatus for high-pressure injection molding in molten state of plastic oil has the following advantages compared with the method for injection molding in non-molten state (i.e. viscous fluid state) of plastic oil or other methods (specifically including two methods, namely, (1) filling, melting and solidifying without using an injection molding machine, as described in the first embodiment, and (2) injection molding with an injection molding machine, but only using the high-pressure injection function of injection molding, and melting and solidifying are performed outside the injection molding machine, as described in the third embodiment):

(1) the process method for molding the plastic oil by high-pressure injection molding of the molten plastic oil has the advantages that the total manufacturing time of a single plastic oil product is reduced to about 1 minute from 30 minutes or even longer (the larger the size of the plastic oil product is, the longer the time is) of non-molten injection and molding processes, the process method is greatly shortened, the production efficiency of the plastic state oil product is obviously improved and the production cost is obviously reduced, and the larger the size of the plastic state oil product is, the more obvious the efficiency is improved, as the size of the plastic state oil product is increased, the manufacturing time of the non-molten state filling and forming method of the plastic state oil (mainly the melting time of the plastic state oil raw material in the oven) is increased by dozens of minutes, whereas the molten state high pressure injection molding (melting of the plastic oil raw material in a heated cylinder) is increasing for at most several seconds or at most several tens of seconds. If the multi-cavity die is adopted, the advantages of efficiency improvement and cost reduction are more prominent;

(2) the non-molten state injection and molding process method of the plastic state oil is characterized in that when the plastic state oil bearing is manufactured, a bearing and a plastic state oil raw material enter an oven together, the heating time lasts for 30 minutes or even longer (the larger the bearing is, the thicker the bearing wall thickness is, the longer the required time is), the melting temperature covers the tempering temperature of a bearing ring, the risk of micro deformation and slight reduction of hardness of the bearing ring are caused, the problem does not exist on a common bearing, but the problem is caused on a high-precision bearing, and therefore the non-molten state injection and molding process method of the plastic state oil is not suitable for manufacturing a precise (P5 and higher precision) plastic state oil bearing. In addition, this melting temperature also far exceeds the working temperature upper limit of the plastic holder (the short-time working temperature upper limit of PA66 is only 120 degrees), the plastic holder is heated for more than 30 minutes or even longer under the melting temperature of the plastic oil, which will lead to the deformation and aging of the plastic holder, and lead to the inflexible operation or the clamping stagnation of the bearing, therefore, the non-molten state injection and molding process of the plastic oil is not suitable for manufacturing the plastic oil bearing with the plastic holder, which has been practically verified by the present invention. The high-pressure injection molding process method of the molten state of the plastic state oil does not heat the bearing at the molten state oil temperature (if the bearing needs to be preheated before being placed into a mold, the preheating temperature is usually lower than 120 ℃, and the preheating time is short), the time of the bearing subjected to heat conduction of the high-temperature molten plastic state oil is the injection time and the pressure-holding time, generally only 15 seconds are needed, and no negative influence is caused on the bearing ring and the plastic retainer. Therefore, the plastic state oil melting state high-pressure injection molding process method can produce precise plastic state oil bearings and plastic state oil bearings with plastic cages.

(3) The non-molten state injection and molding process method of the plastic oil has the advantages that the exposure time of the plastic oil at 140-180 ℃ is 30 minutes or even longer, the temperature exceeds the upper limit of the working temperature of mineral oil (the upper limit of temperature resistance is 130 ℃) and semisynthetic oil (the upper limit of temperature resistance is 160 ℃), the plastic oil is volatilized and oxidized after being heated for a long time, the lubrication life of the plastic oil is shortened, and therefore, the process technical method is not suitable for manufacturing plastic oil bearings and plastic oil components which take the mineral oil and the semisynthetic oil as base oil. The plastic state oil melting state high pressure injection molding process method has the advantages that the whole heating time of the plastic state oil is generally not more than 1 minute, so the adverse effect on mineral oil and semisynthetic oil is very little, therefore, the plastic state oil melting state high pressure injection molding process method can be used for manufacturing plastic state oil bearings and plastic state oil elements which take the mineral oil and the semisynthetic oil as base oil, and the mineral oil and the semisynthetic oil have the advantage in the aspect of price compared with the fully synthetic oil.

(4) A non-molten state injection and molding process for plastic oil features that when the plastic oil bearing or plastic oil element is made, the raw material of plastic oil is heated in bearing or mould and gradually transformed into molten state, resulting in physical and chemical reactions, which can not be manually intervened (because the bearing, mould and plastic oil are in enclosed heater, such as baking oven), and after the molten state is transformed into molten state, the total volume of plastic oil is reduced, resulting in that the molten state is not filled in bearing cavity, the original horizontal upper liquid level of raw material of plastic oil is transformed into the upper liquid level of molten state of plastic oil, which is then cooled and hardened to affect the appearance and quality of plastic oil, and the plastic oil has annular flash edge along the inner and outer surfaces of bearing and bearing inner rings, resulting in flush with bearing end surface, the fins can exceed the end face of the bearing, and the installation and the use of the bearing to the main machine are influenced; for a sealed bearing (the materials are injected to be level with the bottom surface of a sealing groove of a bearing ring), the flashes exceed the bottom surface of the sealing groove and affect the correct installation and use of the bearing sealing element, so the flashes must be cut off by a sharp tool, but the cutting off of the flashes is simple and time-consuming and labor-consuming. Similarly, when the plastic oil element is manufactured by a non-molten state injection and molding process, the plastic oil element with strict dimensional tolerance requirements cannot be manufactured due to volume shrinkage of the plastic oil, uneven molding surface, flash generation and the like. The molten state high pressure injection molding process of plastic state oil includes injecting the plastic state oil into the bearing cavity or mold cavity in molten state, cooling and contracting volume, maintaining pressure for certain time to fill the bearing cavity or mold cavity with the molded plastic state oil, and limiting the injection mold to level the upper and lower surfaces without wavy unevenness and flash. Therefore, compared with the non-molten state injection/injection and molding process method, the molten state high-pressure injection molding process method of the plastic state oil not only ensures that the molded plastic state oil is full, has standard size and smooth surface without wave and flash, but also correspondingly omits the procedures of surface shaping and flash removal, and simultaneously improves the molding quality and the production efficiency of the plastic state oil.

The molten state high-pressure injection molding process method of the plastic state oil overcomes a plurality of technical quality and efficiency problems of other injection molding process methods, and has better quality and improved efficiency by several times and dozens of times for plastic state oil bearings and plastic state oil components which can be produced by other process methods, such as non-precise plastic state oil bearings, non-precise plastic state oil components, metal retainer bearings, non-retainer full rolling body bearings and fully-synthesized base oil plastic state oil products. In addition, the precise plastic oil bearing and the precise plastic oil element which can not be produced by other methods, the plastic oil bearing with a plastic retainer and the plastic oil bearing and the plastic oil element which take mineral oil or semi-synthetic oil as base oil can also be produced according to the plastic oil molten state high-pressure injection molding process method. Greatly improves the product quality and the production efficiency of the plastic state oil, reduces the manufacturing cost of the plastic state oil, and widens the application field of the plastic state oil.

The above disclosure is only for the specific embodiments of the present application, but the present application is not limited thereto, and any variations that can be considered by those skilled in the art are intended to fall within the scope of the present application.

Claims

1. The utility model provides a equipment for making of plastic state oil bearing which characterized in that includes: an injection subsystem, a mold closing subsystem, a heating subsystem and a control unit, wherein,

the injection subsystem comprises a melting device and a power transmission device, the melting device comprises a feeding device for containing and mixing plastic oil raw materials and a charging barrel for containing and heating the plastic oil raw materials in flowing, and a high-pressure injection opening arranged at the end part of the charging barrel, the power transmission device comprises a screw rod or plunger driving device, an injection power driving device for injecting the molten plastic oil into the runner of the injection molding mold at high pressure and finally entering the inner cavity of the bearing, and an execution mechanism;

the mold closing subsystem comprises an injection molding mold which is pre-loaded with an oil bearing to be injected, and a mold closing driving device for opening/closing the mold;

a control unit: the injection power driving device is used for controlling the injection pressure of the injection power driving device so as to enable the high-pressure molten plastic state oil to be injected into the bearing inner cavity placed in the mold cavity.

2. The apparatus of claim 1, further comprising:

the cooling subsystem is used for cooling the mould including water cooling so as to harden and shape the plastic oil fully filled in the bearing inner cavity from a molten state due to cooling;

3. The apparatus of claim 1, further comprising:

the hopper is internally provided with a stirring device for keeping all the components of the plastic oil raw material in the hopper in a uniformly dispersed state all the time.

4. The apparatus of claim 1, further comprising: the plastic oil raw material comprises 20-40 wt%, 50-80 wt%, 0.1-1.5 wt% and 0-1 wt% of a polymer base material, lubricating oil, a fatty acid salt and a solid lubricant, wherein the lubricating oil comprises mineral oil, synthetic oil and semisynthetic oil formed by mixing the mineral oil and the synthetic oil according to a certain proportion, and comprises industrial-grade lubricating oil, food-grade lubricating oil and food-grade antibacterial lubricating oil.

5. The apparatus of claim 1, wherein the screw design parameter is a compression ratio greater than 4, and the clearance between the screw and the barrel is 0.001 to 0.003 times the outer diameter of the screw to prevent the screw from slipping and failing to entrain material during operation.

6. An apparatus for manufacturing a plastic oil component, comprising: an injection subsystem, a mold closing subsystem, a heating subsystem and a control unit, wherein,

the injection subsystem comprises a melting device and a power transmission device, the melting device comprises a feeding device for containing and mixing the plastic oil raw materials and a charging barrel for containing and heating the plastic oil raw materials in flowing, and a high-pressure injection opening arranged at the end part of the charging barrel, the power transmission device comprises a screw rod or plunger driving device, an injection power driving device for injecting the molten plastic oil into the cavity of the injection molding mold at high pressure and an execution mechanism;

the mold closing subsystem comprises an injection molding mold for injecting oil in a state of injection and a mold closing driving device for opening/closing the mold;

a control unit: and the injection molding device is used for controlling the injection of the high-pressure molten plastic oil into the shaping inner cavity of the injection molding mold.

7. The apparatus of claim 6, wherein the screw design parameter is a compression ratio greater than 4, and the clearance between the screw and the barrel is 0.001 to 0.003 times the outer diameter of the screw to prevent the screw from slipping and failing to entrain material during operation.