CN106696236B - LED bulb lamp shell forming process and blow molding mold and forming device thereof - Google Patents
LED bulb lamp shell forming process and blow molding mold and forming device thereof Download PDFInfo
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- CN106696236B CN106696236B CN201510440860.1A CN201510440860A CN106696236B CN 106696236 B CN106696236 B CN 106696236B CN 201510440860 A CN201510440860 A CN 201510440860A CN 106696236 B CN106696236 B CN 106696236B
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Abstract
The LED bulb lamp shell forming process comprises the following steps: firstly, injection molding a blank body with an opening; and secondly, moving the blank formed in the step I into a blow molding cavity, performing blow molding by adopting high-pressure gas, firstly performing primary blowing, and then performing secondary blowing until the blank is formed into the LED bulb lamp shell. And thirdly, demolding. The blow molding mold comprises a blow molding upper mold and a blow molding lower mold, wherein the blow molding upper mold is internally provided with an inner air passage and a main air passage, and the inner air passage firstly enters air and then enters the main air passage when blow molding is carried out. The LED bulb lamp shell forming device adopting the blow molding mould comprises a mould table, wherein the mould table is provided with a blank forming station, a blow molding station and a demoulding station; forming a blank body at a blank body forming station; blow molding at a blow molding station; demoulding the finished product at a demoulding station; the inner air passage, the main air passage and the high-pressure gas generating device are connected. The invention can make the thickness of the product uniform, and simultaneously avoid the generation of the trace line of the sliding block to a greater extent.
Description
Technical Field
The invention relates to a forming process of an LED bulb lamp shell, and a die and a device for realizing the process.
Background
At present, in the LED lighting industry in China, the forming process of the bulb lamp housing is developed from split injection molding and blow molding to integrated injection-blow molding.
The injection-blowing integrated molding is divided into a two-station design and a three-station design, the two-station design generally adopts horizontal equipment, the three-station design generally adopts vertical equipment, and therefore the adopted molds are different. Generally, two horizontal stations adopt a female die consisting of two male dies, the two sides of the female die are respectively provided with an injection molding cavity and a blow molding cavity, and continuous injection-blow integrated molding is realized through 180-degree rotation of the female die; the mould that vertical equipment used is three and goes up the mould, two lower moulds, and first station lower mould is the die cavity of moulding plastics, and second station lower mould is the blowing die cavity, and three go up the mould the same and rotate 120 graduation on the carousel and realize continuous notes blow integrated into one piece. The technology is still in the process of development and does not form a completely mature technical scheme.
From the comprehensive evaluation results in the aspects of equipment structure rationality, operation simplicity, production efficiency, product quality and the like, the three-station vertical injection-blow integrated molding is a mature integral scheme in the industry at present.
Research on three-station vertical injection-blow integrated molding discovers that the bulb shell produced by the method still generates the phenomenon of uneven thickness of the bulb shell and obvious trace lines of the slide block under the states of the current process, the current die and the current equipment, and the problem also generally exists in the industry, so that the phenomenon of inconsistent and obvious appearance defects of light transmission at each part of the final finished product when the final finished product is lightened can be caused, and the appearance feeling of a user on the product is further influenced.
Disclosure of Invention
In order to overcome the defects that a product formed by the existing LED bulb lamp shell forming process is uneven in thickness and has obvious slider trace lines, the invention provides the LED bulb lamp shell forming process which can form the product with the uniform thickness and avoid the slider trace lines to a greater extent, and provides a die and a device for realizing the process.
The technical scheme for solving the technical problem is as follows: the LED bulb lamp shell forming process comprises the following steps:
firstly, an embryo body with an opening is formed in an injection molding mode, and one end, far away from the opening, of the embryo body is a closed end of the embryo body;
moving the blank formed in the step one to a blow molding cavity, and performing blow molding by adopting high-pressure gas;
demoulding the blow molding finished product;
in the second step, firstly, primary blowing is carried out, and high-pressure gas acts on the closed end of the blank during the primary blowing, so that the closed end of the blank is firstly expanded, but the closed end of the blank does not touch the wall of the blow molding cavity;
and performing secondary air blowing after the primary air blowing is performed, wherein air is fed from the edge of the opening of the blank during the secondary air blowing until the blank is molded into the LED bulb shell.
During the second blowing, high pressure gas can be kept acting on the closed end of the blank.
Preferably, the air pressure of the primary air blowing and the secondary air blowing is 2 ~ 6MPa, and the secondary air blowing is started 0.2 ~ 0.6 seconds after the primary air blowing is started.
Preferably, the primary and secondary blowing processes last 6 ~ 12 seconds.
Preferably, the temperature of the high pressure gas in step (c) is 200 ~ 350 ℃.
Preferably, in the step (iii), the finished product is blown off and demolded by blowing air into the blow-molded finished product.
The LED bulb lamp housing blow molding forming die comprises an upper blow molding die and a lower blow molding die, wherein the upper blow molding die comprises a main air channel plate, a forming rod penetrates through the main air channel plate, the lower end of the forming rod extends out of the main air channel plate to form a ball head, and a blow molding cavity for blow molding can be formed between the ball head and the lower blow molding die;
an electric heating rod is arranged in the forming rod, a liftable gas needle is arranged in the electric heating rod in an axial penetrating manner, an inner gas channel opening opposite to the gas needle is arranged on the lower end face of the ball head, an inner gas channel is arranged in the forming rod and communicated with the inner gas channel opening, when the gas needle descends, the inner gas channel opening is sealed by the gas needle, and when the gas needle ascends, the inner gas channel opening is opened;
the forming rod is arranged in the main air channel plate in a liftable and liftable mode, so that the sealing surface between the lower end surface of the main air channel plate and the forming rod is opened when the forming rod descends, and the sealing surface between the lower end surface of the main air channel plate and the forming rod is closed when the forming rod ascends.
Furthermore, an involutive fixed sleeve is clamped outside the main air duct plate, a barb cavity is formed between the fixed sleeve and the main air duct plate, and the barb cavity can be respectively communicated with the blank cavity and the blow molding cavity.
Furthermore, the upper end of the air needle is surrounded in a lower air pressing cavity, and the air needle is pressed downwards when the lower air pressing cavity is ventilated; the upper end of the air needle is sleeved with a spring, and the air needle can be lifted under the action of the spring.
Further, a position sensor is arranged between the blank lower die and the upper die, and when the upper die and the blank lower die are matched, the position sensor transmits a matched die signal.
Furthermore, the electric heating rod penetrates through the forming rod, and the inner air channel is formed between the electric heating rod and the forming rod.
Furthermore, a stroke cavity is formed in the upper end face of the main air duct plate, a stroke limiting block is tightly sleeved on the forming rod and is positioned in the stroke cavity; and a forming rod positioning block is arranged above the main air duct plate, the upper end of the forming rod is fixed on the forming rod positioning block, the downward pressing air cavity is formed in the forming rod positioning block, and the forming rod positioning block is connected with the reciprocating driving mechanism.
Furthermore, the forming rod positioning block comprises a forming rod fixing plate superposed on the stroke limiting block, a positioning sleeve superposed above the forming rod fixing plate and a pressing plate superposed on the positioning sleeve, the pressing air cavity is positioned in the positioning sleeve, the air needle penetrates into the pressing air cavity, the reciprocating driving mechanism is connected with the pressing plate, and the forming rod is fixedly connected with the forming rod positioning plate.
Furthermore, the spring is a pressure spring, a lifting plate is arranged in the downward pressing air cavity, the upper end of the air needle is fixedly connected with the lifting plate, the upper end of the spring is propped against the lifting plate, and the lower end of the spring is propped against the bottom surface of the downward pressing air cavity; or: the spring be the extension spring, the push down cylinder in be equipped with fixed cover and establish the lifter plate on the air pin, the upper end of extension spring is connected on the top surface of push down air cavity, the lower extreme of extension spring connect the lifter plate on.
An LED bulb lamp shell forming device adopting the blow molding die comprises a high-pressure gas generating device and a die table, wherein the die table is provided with a blank forming station, a blow molding station and a demolding station;
a blank lower die is arranged at the blank forming station, and a blow molding lower die is arranged at the blow molding station;
the mould table is also provided with a rotary indexing mechanism, the rotary indexing mechanism is provided with an upper mould of the blank body corresponding to the lower mould of the blank body and an upper mould of the blow moulding corresponding to the lower mould of the blow moulding, and the upper mould of the blank body is the same as the upper mould of the blow moulding;
at the blank forming station: after the upper blank die and the lower blank die are assembled, a blank cavity for forming a blank can be formed between a ball head at the lower end of the forming rod and the lower blank die, and the blank is injected and formed in the blank cavity;
at said blow molding station: after the upper blow molding die and the lower blow molding die are assembled, a blow molding cavity for blow molding can be formed between the ball head at the lower end of the molding rod and the lower blow molding die, and the blank body is subjected to blow molding in the blow molding cavity;
at the demolding station: blowing air into the finished product so as to blow off the finished product and demoulding;
the inner air passage is connected with the high-pressure gas generating device through an inner working air pipe, and the main air passage is connected with the high-pressure gas generating device through a main working air pipe.
The high-pressure gas generating device is provided with a lower pressure solenoid valve for controlling the on-off of the lower pressure gas pipe, the position sensor is in signal connection with the lower pressure solenoid valve of the high-pressure gas generating device, and the position sensor transmits a die assembly signal to the lower pressure solenoid valve when the upper die and the blank lower die are assembled so as to instruct the lower pressure solenoid valve to be closed.
Furthermore, an internal working electromagnetic valve for controlling the on-off of the internal working air pipe is arranged on the high-pressure gas generating device; the high-pressure gas generating device is provided with a main working electromagnetic valve for controlling the on-off of the main working air pipe.
Furthermore, a timer for controlling the ventilation time of the inner working air pipe and the main working air pipe is arranged on the high-pressure gas generating device, and the timer is in signal connection with the inner working electromagnetic valve and the main working electromagnetic valve.
Further, the blank forming station, the blow molding station and the demolding station are uniformly distributed on the mold platform; and the rotary indexing mechanism is also provided with a third upper die corresponding to the demolding station, and the third upper die is the same as the blank upper die and the blow molding upper die.
The invention has the beneficial effects that: 1. when blow molding is performed, first, one blow is performed, and the other blow is performed
The lower end of the blank is firstly expanded and then blown for the second time, so that the direct and continuous extrusion of the high-pressure gas on the side wall of the blank is avoided, the thickness of the product is more uniform, and the generation of a slide mark line can be avoided to a greater extent. 2. The electric heating rod is adopted for heating and heat preservation, and the technical means that heating oil is adopted for heating and heat preservation in the prior art is different, so that the temperature of electric heating and heat preservation is kept more accurately, and the difference is reduced.
Drawings
Fig. 1 is a schematic state diagram of a die of the LED bulb lamp housing forming process in the invention when a blank is formed.
Fig. 2 is a schematic diagram of a state of a die of the LED bulb lamp housing forming process in the invention during one-time air blowing.
Fig. 3 is a schematic diagram of a state of a die of the LED bulb lamp housing forming process in the invention during secondary air blowing.
Fig. 4 is a schematic state diagram of a die of the LED bulb lamp housing forming process in demolding.
Fig. 5 is a schematic structural diagram of the device for the LED bulb lamp housing forming process.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
The LED bulb lamp shell forming process comprises the following steps: firstly, a blank with an upward opening is formed in an injection molding mode, and one end, far away from the opening, of the blank is a closed end of the blank.
Moving the blank formed in the step I to a blow molding cavity, and performing blow molding by adopting high-pressure gas: firstly, performing primary blowing, wherein high-pressure gas acts on the closed end of the blank during the primary blowing so as to enable the closed end of the blank to expand firstly, but the closed end of the blank does not touch the wall of the blow molding cavity; and performing secondary air blowing after the primary air blowing is performed, wherein air is fed from the edge of the opening of the blank during the secondary air blowing until the blank is molded into the LED bulb shell. During the second blowing, high pressure gas is also applied to the closed end of the blank.
It is recommended that the air pressure of the primary blow air and the secondary blow air is 2 ~ 6MPa, and the air pressure of the primary blow air and the secondary blow air is 4 MPa in this embodiment.
It is recommended that the second air blow is started 0.2 ~ 0.6.6 seconds after the first air blow is started, and the second air blow is started 0.4 seconds after the first air blow is started in the embodiment.
The primary and secondary air blowing process is recommended to last 6 ~ 12 seconds, and in this embodiment the primary and secondary air blowing process lasts 9 seconds.
It is recommended that the temperature of the high-pressure gas is 200 ~ 350 deg.c in this step (ii) and 300 deg.c in this embodiment.
Of course, the above parameters are only recommended parameters and may be modified in production practice. For example, when the lamp housing of the LED bulb with thicker wall thickness and larger size needs to be formed, the above parameters can be changed accordingly, for example, the blowing time can be longer, or the air pressure can be higher. The adjustment of the above parameters can be determined by a person skilled in the art according to experiments, as long as the purpose of forming a finished product by secondary blowing can be achieved by firstly expanding the closed end of the blank body during primary blowing, but not touching the closed end of the blank body with the cavity wall of the blow molding cavity.
Demoulding the blow moulded product, typically by blowing air into the blow moulded product to blow off the product.
The LED bulb lamp shell forming device comprises a high-pressure gas generating device and a die table, wherein the die table is provided with uniformly distributed blank forming stations, blow molding stations and demolding stations.
The mould comprises three identical upper moulds 3, a blank lower mould 1 for forming a blank and a blow-moulding lower mould 2 for blow-moulding.
The blank lower die 1 is arranged at the blank forming station, and the blow molding lower die 2 is arranged at the blow molding station.
The mould bench still be equipped with rotatory indexing mechanism, this rotatory indexing mechanism can adopt rotatory indexing mechanism, three go up mould 3 locate rotatory indexing mechanism on, three go up mould 3 correspond respectively embryo body shaping station, blow molding station, drawing of patterns station.
At the blank forming station: after the upper die 3 and the blank lower die 1 are assembled, a blank cavity is formed between the upper die and the blank lower die, and a blank 4 is injected into the blank cavity;
at said blow molding station: after the upper die 3 and the blow molding lower die 2 are assembled, a blow molding cavity is formed between the upper die and the blow molding lower die, and the blank 4 is subjected to blow molding in the blow molding cavity;
at the demolding station: blowing air into the finished product so as to blow off the finished product and demoulding;
the upper die 3 comprises a main air channel plate 5, a forming rod 6 penetrates through the main air channel plate 5, the lower end of the forming rod 6 extends out of the main air channel plate 5 to form a ball head 7, the blank cavity can be formed between the ball head 7 and the blank lower die 1, the blow molding cavity can be formed between the ball head 7 and the blow molding lower die 2, an involutory fixed sleeve 8 is clamped outside the main air channel plate 5, a barb cavity is formed between the fixed sleeve 8 and the main air channel plate 5, and the barb cavity can be respectively communicated with the blank cavity and the blow molding cavity.
The shaping stick 6 in be equipped with electric heating rod 9, electric heating rod 9 in wear to be equipped with the liftable gas needle 10 of axial setting, it is just right to be equipped with on the lower terminal surface of bulb 7 the interior gas channel mouth 11 of gas needle 10, shaping stick 6 in be equipped with interior gas channel, in this embodiment electric heating rod 9 run through shaping stick 6, interior gas channel 12 form in electric heating rod 9 and shaping stick 6 between. The inner air channel 12 is communicated with the inner air channel opening 11, when the air needle 10 descends, the air needle 10 closes the inner air channel opening 11, and when the air needle 10 ascends, the inner air channel opening 11 is opened.
A main air duct 13 is provided between the forming rod 6 and the main air duct plate 5, a sealing surface 14 is formed between the lower end surface of the main air duct plate 5 and the forming rod 6, and the forming rod 6 is inserted into the main air duct plate 5 so as to be capable of moving up and down, so that the sealing surface 14 between the lower end surface of the main air duct plate and the forming rod is opened when the forming rod 6 descends, and the sealing surface 14 between the lower end surface of the main air duct plate and the forming rod is closed when the forming rod ascends.
The inner air passage 12 is connected with the high-pressure gas generating device 25 through an inner working air pipe, and the main air passage 13 is connected with the high-pressure gas generating device 25 through a main working air pipe.
When the LED bulb lamp shell forming device is used, as in the prior art, a blank 4 for blow molding is formed at a blank forming station, the upper die 3 and the blank lower die 1 are closed, the blank 4 is injection-molded in a blank cavity, and the main body of the blank 4 is wrapped on a ball head 7 of a forming rod. The barb cavity formed between the fixing sleeve 8 and the main air duct plate 5 ensures that the blank 4 can be fixed on the upper die through a barb after the blank is molded, and when the upper die moves along with the rotary indexing mechanism, the blank can also move along with the upper die.
After the mold is opened, the upper mold of the blank forming station rotates 120 degrees under the action of the rotary indexing mechanism to reach the blow molding station, after the upper mold 3 and the blow molding lower mold 2 at the blow molding station are closed, firstly the air needle 10 rises to open the inner air passage opening 11, high-temperature and high-pressure gas is introduced into the inner air passage 12, the high-temperature and high-pressure gas is blown into the blank 4 through the inner air passage opening 11, so that the lower end of the blank 4 is firstly expanded, and the blank 4 has a pre-expanded inflation space 15.
After the lower end of the blank is expanded, the forming rod 6 descends, so that a sealing surface 14 between the main air channel plate and the forming rod is opened, high-temperature and high-pressure gas is introduced into the main air channel 13 and is blown into the blank through a gap between the main air channel plate 5 and the forming rod 6 until the blank is blow-molded into a finished product LED bulb lamp shell 16.
And after the blow molding is finished, the mold is opened, an upper mold of the blow molding station rotates 120 degrees under the action of the rotary indexing mechanism to reach a demolding station, a lower mold is not arranged at the demolding station, the involuted fixed sleeve 8 is separated towards two sides, so that the barb 17 of the product in the barb cavity is firstly demolded, then normal-temperature high-pressure gas is blown into the product through the inner air passage 12 and/or the main air passage 13, and the molded finished product is blown off and demolded.
The conversion between blowing high-temperature high-pressure gas and blowing normal-temperature high-pressure gas by the high-pressure gas generating device is a conventional technology of the existing high-pressure gas generating device, and is not described herein again.
In the embodiment, the blank forming station, the blow forming station and the demolding station are uniformly distributed, and three same upper dies are adopted, so that the device disclosed by the invention can continuously operate, and the production efficiency is improved.
The lifting of the air needle can be realized by adopting the following structural mode: the upper end of the air needle 10 is enclosed in a lower air pressing cavity 18, the lower air pressing cavity 18 is connected with the high-pressure air generating device through a lower air pressing pipe, and the air needle 10 is pressed down when the lower air pressing pipe is ventilated. In a normal state, high-pressure gas is normally supplied into the lower air pressure pipe, the air needle 10 is kept in a downward pressure state, and the air needle 10 seals the inner air passage opening 11. The utility model discloses a gas needle, including idiosome lower mould 2 and last mould 3, last mould 3 with idiosome lower mould 2 when the compound die of position sensor with position sensor give the compound die signal transmission high-pressure gas generating device, high-pressure gas generating device break down the tracheal high-pressure gas of holding down and let in, the upper end cover of gas needle has a spring 19, under the circumstances of high-pressure gas disconnection, will under the effect of spring 19 gas needle 10 promote to open interior gas channel mouth 11. The specific control mode of the on-off of the air compressing pipe under the control of the position sensor can adopt the control of an electromagnetic valve: the high-pressure gas generating device is provided with a pressing electromagnetic valve for controlling the on-off of the pressing gas pipe, the position sensor is in signal connection with the pressing electromagnetic valve of the high-pressure gas generating device, and the position sensor transmits a die assembly signal to the pressing electromagnetic valve when the upper die 3 and the blank lower die 2 are assembled so as to instruct the pressing electromagnetic valve to be closed.
In this embodiment, the lifting of the forming rod 6 can be realized by adopting the following structural mode: a stroke cavity is formed in the upper end face of the main air duct plate 5, a stroke limiting block 20 is tightly sleeved on the forming rod, and the stroke limiting block 20 is located in the stroke cavity; a forming rod positioning block is arranged above the main air duct plate 5, the upper end of the forming rod 6 is fixed on the forming rod positioning block, the lower air pressing cavity 18 is formed in the forming rod positioning block, and the forming rod positioning block is connected with the reciprocating driving mechanism. The forming rod positioning block is driven to descend by the reciprocating driving mechanism, the descending stroke can be controlled in the stroke cavity by the stroke limiting block 20, and the forming rod positioning block can also be driven to ascend and descend by the reciprocating driving mechanism, so that the forming rod 6 is driven to ascend and descend by the forming rod positioning block. The reciprocating driving mechanism can adopt hydraulic cylinders and the like. The specific composition of the forming rod positioning block can adopt the following modes: the molding rod positioning block comprises a molding rod fixing plate 21 superposed on the stroke limiting block 20, a positioning sleeve 22 superposed above the molding rod fixing plate 21 and a pressing plate 23 superposed on the positioning sleeve 22, wherein the lower air pressing cavity 18 is positioned in the positioning sleeve 22, the air needle 10 penetrates into the lower air pressing cavity 18, the reciprocating driving mechanism is connected with the pressing plate 23, and the molding rod is fixedly connected with the molding rod positioning plate.
The spring 19 for driving the air needle to lift can be a pressure spring or a tension spring. When the spring 19 is a pressure spring, a lifting plate 24 is arranged in the downward pressing air cavity, the upper end of the air needle 10 is fixedly connected with the lifting plate 24, the upper end of the spring 19 is propped against the lifting plate 24, and the lower end of the spring 19 is propped against the bottom surface of the downward pressing air cavity 18; when the spring is a tension spring, the lower pressing cylinder is internally provided with a lifting plate fixedly sleeved on the air needle, the upper end of the tension spring is connected to the top surface of the lower pressing air cavity, and the lower end of the tension spring is connected to the lifting plate.
In this embodiment, the high-pressure gas generating device is provided with an internal working electromagnetic valve for controlling the on/off of the internal working air pipe, and the on/off of the internal working air pipe is controlled by the internal working electromagnetic valve; the high-pressure gas generating device is provided with a main working electromagnetic valve for controlling the on-off of the main working air pipe, and the on-off of the main working air pipe is controlled by the main searching working electromagnetic valve. The high-pressure gas generating device can be further provided with a timer for controlling the ventilation time of the inner working gas pipe and the main working gas pipe, the timer is in signal connection with the inner working electromagnetic valve and the main working electromagnetic valve, and the on-off time of the inner working electromagnetic valve and the main working electromagnetic valve is controlled by the timer.
Example two
The air pressure of the primary air blowing and the secondary air blowing in this example was 2 MPa. The gas pressure refers to a gas pressure when the high-pressure gas is output from the high-pressure gas generator.
In this embodiment, the second air blowing is started 0.5 seconds after the first air blowing is started.
The primary and secondary blowing process in this example lasted 8 seconds.
In the second step of this embodiment, the temperature of the high-pressure gas is 280 ℃.
The rest of the implementation manner is the same as the first embodiment.
EXAMPLE III
The air pressure of the primary air blowing and the secondary air blowing in this example was 6 MPa. The gas pressure refers to a gas pressure when the high-pressure gas is output from the high-pressure gas generator.
In this embodiment, the second air blowing is started 0.3 seconds after the first air blowing is started.
The primary and secondary air blowing processes in this example lasted 12 seconds.
In the second step of this embodiment, the temperature of the high-pressure gas is 200 ℃.
The rest of the implementation manner is the same as the first embodiment.
Example four
The air pressure of the primary air blowing and the secondary air blowing in this example was 3 MPa. The gas pressure refers to a gas pressure when the high-pressure gas is output from the high-pressure gas generator.
In this embodiment, the second air blowing is started 0.2 seconds after the first air blowing is started.
The primary and secondary air blowing processes in this example lasted 10 seconds.
In the second step of this embodiment, the temperature of the high-pressure gas is 350 ℃.
The rest of the implementation manner is the same as the first embodiment.
EXAMPLE five
The air pressure of the primary air blowing and the secondary air blowing in this example was 5 MPa. The gas pressure refers to a gas pressure when the high-pressure gas is output from the high-pressure gas generator.
In this embodiment, the second air blowing is started 0.6 seconds after the first air blowing is started.
The primary and secondary air blowing process in this example lasted 6 seconds.
In the second step of this embodiment, the temperature of the high-pressure gas is 250 ℃.
The rest of the implementation manner is the same as the first embodiment.
Claims (18)
- The LED bulb lamp shell forming process comprises the following steps:firstly, an embryo body with an opening is formed in an injection molding mode, and one end, far away from the opening, of the embryo body is a closed end of the embryo body;moving the blank formed in the step one to a blow molding cavity, and performing blow molding by adopting high-pressure gas;demoulding the blow molding finished product;the method is characterized in that: in the second step, the first air blowing is performed by high pressure airA closed end for the blank, such that the closed end of the blank expands first, but the closed end of the blank does not touch the wall of the blow cavity;and performing secondary air blowing after the primary air blowing is performed, wherein air is fed from the edge of the opening of the blank during the secondary air blowing until the blank is molded into the LED bulb shell.
- 2. The forming process of the lamp housing of the LED bulb according to claim 1, wherein: and keeping high-pressure gas acting on the closed end of the blank body during secondary blowing.
- 3. The forming process of the lamp shell of the LED bulb according to claim 1, wherein the air pressure of the primary air blowing and the secondary air blowing is 2 ~ 6MPa, and the secondary air blowing is started after the primary air blowing is started for 0.2 ~ 0.6.6 seconds.
- 4. The process for molding the lamp shell of the LED bulb according to claim 3, wherein the primary blowing and the secondary blowing lasts for 6 ~ 12 seconds.
- 5. The process for molding the lamp envelope of the LED bulb according to claim 1 ~ 4, wherein the temperature of the high-pressure gas in the step (②) is 200 ~ 350 ℃.
- 6. The process for forming the lamp housing of the LED bulb according to claim 1 ~ 4, wherein in the step (iii), the finished product is blown out and demolded by blowing air into the blow-molded finished product.
- 7. An LED bulb lamp housing blow molding mold for the LED bulb lamp housing molding process according to claim 1 ~ 6, comprising an upper blow mold and a lower blow mold, wherein the upper blow mold comprises a main air duct plate, a molding rod penetrates through the main air duct plate, the lower end of the molding rod extends out of the main air duct plate and forms a ball head, and a blow molding cavity for blow molding is formed between the ball head and the lower blow mold;the method is characterized in that: an electric heating rod is arranged in the forming rod, a liftable gas needle is arranged in the electric heating rod in an axial penetrating manner, an inner gas channel opening opposite to the gas needle is arranged on the lower end face of the ball head, an inner gas channel is arranged in the forming rod and communicated with the inner gas channel opening, when the gas needle descends, the inner gas channel opening is sealed by the gas needle, and when the gas needle ascends, the inner gas channel opening is opened;a main air channel is arranged between the forming rod and the main air channel plate, a sealing surface is formed between the lower end surface of the main air channel plate and the forming rod, and the forming rod is arranged in the main air channel plate in a penetrating way in a lifting way, so that the sealing surface between the lower end surface of the main air channel plate and the forming rod is opened when the forming rod descends, and the sealing surface between the lower end surface of the main air channel plate and the forming rod is closed when the forming rod ascends;and a position sensor is arranged between the blank lower die and the upper die, and transmits a die closing signal when the upper die and the blank lower die are closed.
- 8. The blow molding mold for the lamp housing of the LED bulb according to claim 7, wherein: the main air duct plate is externally clamped with an involutive fixed sleeve, a barb cavity is formed between the fixed sleeve and the main air duct plate, and the barb cavity can be respectively communicated with the blank cavity and the blow molding cavity.
- 9. The LED bulb lamp housing forming mold according to claim 7 or 8, wherein: the upper end of the air needle is surrounded in a lower air pressing cavity, and the air needle is pressed downwards when the lower air pressing cavity is ventilated;the upper end of the air needle is sleeved with a spring, and the air needle can be lifted under the action of the spring.
- 10. The blow molding mold for the lamp housing of the LED bulb according to claim 7 or 8, wherein: the electric heating rod penetrates through the forming rod, and the inner air channel is formed between the electric heating rod and the forming rod.
- 11. The blow molding mold for the lamp housing of the LED bulb according to claim 9, wherein: the upper end face of the main air duct plate is provided with a stroke cavity, the forming rod is tightly sleeved with a stroke limiting block, and the stroke limiting block is positioned in the stroke cavity;and a forming rod positioning block is arranged above the main air duct plate, the upper end of the forming rod is fixed on the forming rod positioning block, the downward pressing air cavity is formed in the forming rod positioning block, and the forming rod positioning block is connected with the reciprocating driving mechanism.
- 12. The blow molding mold for the lamp housing of the LED bulb according to claim 11, wherein: the forming rod positioning block comprises a forming rod fixing plate, a positioning sleeve and a pressing plate, the forming rod fixing plate is stacked on the stroke limiting block, the positioning sleeve is stacked above the forming rod fixing plate, the pressing plate is stacked on the positioning sleeve, the pressing air cavity is located in the positioning sleeve, the air needle penetrates into the pressing air cavity, the reciprocating driving mechanism is connected with the pressing plate, and the forming rod is fixedly connected with the forming rod positioning plate.
- 13. The blow molding mold for the lamp housing of the LED bulb according to claim 12, wherein: the spring is a pressure spring, a lifting plate is arranged in the downward pressing air cavity, the upper end of the air needle is fixedly connected with the lifting plate, the upper end of the spring abuts against the lifting plate, and the lower end of the spring abuts against the bottom surface of the downward pressing air cavity;or: the spring be the extension spring, the push down cylinder in be equipped with fixed cover and establish the lifter plate on the air pin, the upper end of extension spring is connected on the top surface of push down air cavity, the lower extreme of extension spring connect the lifter plate on.
- 14. An LED bulb lamp housing forming device adopting the blow molding die of claim 7 ~ 13, comprising a high-pressure gas generating device and a die table, wherein the die table is provided with a blank forming station, a blow molding station and a demolding station;a blank lower die is arranged at the blank forming station, and a blow molding lower die is arranged at the blow molding station;the method is characterized in that: the mould table is also provided with a rotary indexing mechanism, the rotary indexing mechanism is provided with an upper mould of the blank body corresponding to the lower mould of the blank body and an upper mould of the blow moulding corresponding to the lower mould of the blow moulding, and the upper mould of the blank body is the same as the upper mould of the blow moulding;at the blank forming station: after the upper blank die and the lower blank die are assembled, a blank cavity for forming a blank can be formed between a ball head at the lower end of the forming rod and the lower blank die, and the blank is injected and formed in the blank cavity;at said blow molding station: after the upper blow molding die and the lower blow molding die are assembled, a blow molding cavity for blow molding can be formed between the ball head at the lower end of the molding rod and the lower blow molding die, and the blank body is subjected to blow molding in the blow molding cavity;at the demolding station: blowing air into the finished product so as to blow off the finished product and demoulding;the inner air passage is connected with the high-pressure gas generating device through an inner working air pipe, and the main air passage is connected with the high-pressure gas generating device through a main working air pipe.
- 15. The LED bulb housing forming device of claim 14, wherein: the high-pressure gas generating device is provided with a pressing electromagnetic valve for controlling the on-off of the working gas pipe, the position sensor is in signal connection with the pressing electromagnetic valve of the high-pressure gas generating device, and the position sensor transmits a die assembly signal to the pressing electromagnetic valve when the upper die and the blank lower die are assembled so as to instruct the pressing electromagnetic valve to be closed.
- 16. The LED bulb housing forming device of claim 14, wherein: the high-pressure gas generating device is provided with an inner working electromagnetic valve for controlling the on-off of the inner working air pipe;the high-pressure gas generating device is provided with a main working electromagnetic valve for controlling the on-off of the main working air pipe.
- 17. The LED bulb housing forming device of claim 16, wherein: the high-pressure gas generating device is provided with a timer for controlling the ventilation time of the inner working gas pipe and the main working gas pipe, and the timer is in signal connection with the inner working electromagnetic valve and the main working electromagnetic valve.
- 18. The LED bulb housing forming device of claim 14, wherein: the blank forming station, the blow molding station and the demolding station are uniformly distributed on the mold platform;and the rotary indexing mechanism is also provided with a third upper die corresponding to the demolding station, and the third upper die is the same as the blank upper die and the blow molding upper die.
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| CN201510440860.1A CN106696236B (en) | 2015-07-25 | 2015-07-25 | LED bulb lamp shell forming process and blow molding mold and forming device thereof |
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| CN201510440860.1A CN106696236B (en) | 2015-07-25 | 2015-07-25 | LED bulb lamp shell forming process and blow molding mold and forming device thereof |
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| CN107187002B (en) * | 2017-06-09 | 2019-05-17 | 厦门普拉米达光电科技有限公司 | A kind of full angle LED plastic ball lampshade manufacture craft |
| CN113799370A (en) * | 2021-08-25 | 2021-12-17 | 东莞市博发光电科技有限公司 | Preparation method of PC lamp housing |
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| CN102958672A (en) * | 2010-06-04 | 2013-03-06 | 韩政旭 | Blower type injection mold for light diffusing polycarbonate, and injection method |
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| TW201043856A (en) * | 2009-06-12 | 2010-12-16 | Sheng-Yi Zhuang | Method for manufacturing light cover |
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| JPH1177809A (en) * | 1997-09-16 | 1999-03-23 | Sumitomo Heavy Ind Ltd | Method for double-layer injection blow molding |
| CN102958672A (en) * | 2010-06-04 | 2013-03-06 | 韩政旭 | Blower type injection mold for light diffusing polycarbonate, and injection method |
| TW201501907A (en) * | 2013-02-15 | 2015-01-16 | Toyo Seikan Group Holdings Ltd | Method for manufacturing synthetic resin container |
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