CN108773077B - Plastic vibration friction welding machine with preheating device - Google Patents

Plastic vibration friction welding machine with preheating device Download PDF

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Publication number
CN108773077B
CN108773077B CN201810621321.1A CN201810621321A CN108773077B CN 108773077 B CN108773077 B CN 108773077B CN 201810621321 A CN201810621321 A CN 201810621321A CN 108773077 B CN108773077 B CN 108773077B
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China
Prior art keywords
vibration
plastic
frame
preheating device
concave groove
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CN201810621321.1A
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Chinese (zh)
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CN108773077A (en
Inventor
汪新民
张仕达
杨进康
汪秀珍
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Ger Sonre Changzhou Welding Technology Co ltd
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Ger Sonre Changzhou Welding Technology Co ltd
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/06Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/02Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024Thermal pre-treatments
    • B29C66/0242Heating, or preheating, e.g. drying
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The invention discloses a plastic vibration friction welding machine with a preheating device, which comprises a frame, a pressure adjusting unit arranged on the frame, a lower table top which is connected with the pressure adjusting unit and can be adjusted up and down, and a vibrating unit arranged on the frame, wherein infrared heating devices are arranged on the lower table top and positioned on two sides of the pressure adjusting unit; an electric heating device is arranged on the vibration unit. The invention relates to a plastic vibration friction welding machine with a preheating device, which is characterized in that a plurality of annular electric heaters are arranged, the power is sequentially increased from top to bottom in the vertical direction, the plastic with different heat resistance intensity can be efficiently preheated, an infrared heating device is arranged, the infrared heating device emits heat energy, the heat energy is scattered by generating multiple reflections in a concave groove, and a uniform heat energy field is generated from a lens to pass through a lower die, so that the uniform heating effect on common plastic is realized.

Description

Plastic vibration friction welding machine with preheating device
Technical Field
The invention relates to the technical field of plastic welding machines, in particular to a plastic vibration friction welding machine with a preheating device.
Background
Most plastic vibration friction welding machines in the market are not provided with a preheating device, when common plastics are welded, the temperature of a welding object can be quickly increased after the machine is vibrated and operated for a period of time, so that the heat of the welding object is unevenly distributed, more waste batting and impurities are easily generated in the common plastics, when high-strength plastics are welded, the welding difficulty and the uneven welding seam strength exist, and the phenomenon of uneven heat distribution at the welding position of the plastics exists in the process of generating heat by vibration friction.
In order to solve the problems, the proposal is generated.
Disclosure of Invention
(one) solving the technical problems
The invention aims to overcome the defects of the prior art and provides a plastic vibration friction welding machine which is provided with a preheating device and can realize uniform preheating.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the plastic vibration friction welding machine with the preheating device comprises a frame, a pressure adjusting unit arranged on the frame, a lower table top which is connected with the pressure adjusting unit and can be adjusted up and down, a vibrating unit arranged on the frame, an upper die and a lower die, wherein infrared heating devices are arranged on the lower table top and positioned on two sides of the pressure adjusting unit; the vibration unit is provided with an electric heating device, the electric heating device comprises a hydraulic cylinder and a plurality of annular electric heaters, the output ends of the hydraulic cylinders of the annular electric heaters are connected, the annular electric heaters can be lifted under the action of the hydraulic cylinder, the lower die is provided with a heat conducting plate, and a layer of soundproof cotton is attached to the inner wall of the frame.
Preferably, the plurality of annular electric heaters are arranged on the periphery of the upper die and are sequentially arranged in the vertical direction, and the power of the plurality of annular electric heaters sequentially increases from top to bottom in the vertical direction.
Preferably, the infrared heating device comprises an infrared heater and a concave groove, wherein a reflecting mirror surface matched with the concave groove is arranged on the surface of the inner side of the concave groove, the notch of the concave groove is sealed through a lens and a connecting plate, and one side of the connecting plate positioned in the concave groove is connected with the infrared heater.
Preferably, the vibration unit is connected with an I-shaped platform, one end of the I-shaped platform is connected with the upper die, the upper plane of the I-shaped platform is connected with the vibration unit of the welding machine, and the lower plane of the I-shaped platform is connected with a reinforcing plate; the dimension of the lower plane of the I-shaped platform is larger than that of the upper plane of the I-shaped platform.
Preferably, a plurality of reinforcing ribs are arranged on the side face of the I-shaped platform, a plurality of I-shaped notches are formed in two sides of the I-shaped platform corresponding to the side face in the width direction, I-shaped fastening strips can be installed and detached in the I-shaped notches in an embedded mode, and the I-shaped notches are symmetrically distributed by taking the central line of the corresponding side face of the I-shaped platform as a symmetrical axis.
Preferably, the back of frame articulates there is the door, be provided with silencing device on the door, silencing device includes a plurality of vibration pipe support, sill pillar, vibration pipe support passes through the sill pillar and connects on the door.
Preferably, the inside of vibration pipe support is provided with a plurality of cross frameworks that link to each other in proper order, cross framework divides the inner space of its vibration pipe support into vertical passageway and transverse channel.
Preferably, the inside of the vibrating tube rack is provided with granular sand grains, and the total volume of the sand grains occupies 95-98% of the total volume of the vertical channel and the transverse channel.
(III) beneficial effects
After the technical scheme is adopted, compared with the prior art, the invention has the following advantages: the invention relates to a plastic vibration friction welding machine with a preheating device, which is characterized in that a plurality of annular electric heaters are arranged, the power is sequentially increased from top to bottom in the vertical direction, the plastic with different heat resistance intensity can be efficiently preheated, an infrared heating device is arranged, the infrared heating device emits heat energy, the heat energy is scattered by generating multiple reflections in a concave groove, and a uniform heat energy field is generated from a lens to pass through a lower die, so that the uniform heating effect on common plastic is realized.
Drawings
FIG. 1 is a front cross-sectional view of the present invention;
FIG. 2 is a schematic diagram of an electric heating device according to the present invention;
FIG. 3 is a top view of the structure of the electric heating device of the present invention;
FIG. 4 is a schematic cross-sectional view of a lower die structure of the present invention;
FIG. 5 is a schematic cross-sectional view of an infrared heating device according to the present invention;
FIG. 6 is a top view of the I-shaped platform structure of the present invention;
FIG. 7 is a side view of the I-shaped platform structure of the present invention;
FIG. 8 is a schematic cross-sectional view of a door structure according to the present invention;
fig. 9 is a schematic cross-sectional view of a shaker tube rack structure of the present invention.
In the figure: the device comprises a frame 1, a pressure adjusting unit 2, a lower die 3, an infrared heating device 4, an infrared heater 41, a concave groove 42, a reflecting mirror surface 43, a lens 44, a connecting plate 45, an annular electric heater 5, a hydraulic cylinder 51, an annular electric heater 52, a heat conducting plate 6, a lower table top 7, an I-shaped platform 8, a reinforcing plate 81, a reinforcing rib 82, an I-shaped notch 83, an upper die 9, a vibration unit 10, a sound insulation cotton 11, a door 12, a silencer 13, a vibration pipe frame 131, a bottom column 132, a cross-shaped framework 1311, a vertical channel 1312, a transverse channel 1313 and sand grains 1314.
Detailed Description
The invention is further illustrated by the figures and examples.
As shown in fig. 1-4: a plastic vibration friction welding machine with a preheating device comprises a frame 1, a pressure adjusting unit 2 arranged on the frame, a lower table top 7 which is connected with the pressure adjusting unit and can be adjusted up and down, an upper die 9, a lower die 3 and a vibration unit 10 arranged on the frame 1; the lower table top 7 is provided with infrared heating devices 4 positioned on two sides of the pressure regulating unit 2; the lower die 3 is provided with the heat conducting plate 6, the heat conducting plate 6 is a flexible heat conducting pad, namely a heat conducting pad with thickness, the currently used base material is basically silicon rubber and foaming rubber, the silicon rubber is characterized by good elasticity, the foaming rubber is characterized by large deformation range, good heat conducting effect and higher pressure-resistant grade, the flexible heat conducting pad is often used as a filler with larger gaps for transferring heat, the heat conducting pad is usually used between the PCB boards, between the PCB boards and the machine shell and between the power device and the machine shell, the heat conducting filling particles in the flexible heat conducting pad are generally alumina particles or mixed particles of alumina, magnesia and boron nitride, the heat conducting pad has good heat conducting performance, and can prevent puncture and really play an insulating role, and the heat conducting plate 6 is inlaid on the upper surface of the lower die 3 and can better transfer heat to a welding object; the vibration device 1 is provided with an electric heating device 5, the electric heating device 5 comprises a hydraulic cylinder 51 and a plurality of annular electric heaters 52, and the electric heating device 5 is used for preheating plastics with high strength to be welded.
The annular electric heaters 52 are arranged on the periphery of the upper die 2, and are sequentially arranged in the vertical direction, the power of the annular electric heaters 52 from top to bottom is sequentially increased, in the adjacent annular electric heaters 52, the power of the lower side of each annular electric heater 52 is larger than that of the upper side, and each annular electric heater 52 can be independently controlled to be switched on and off through an external PLC (programmable logic controller), so that high-efficiency preheating can be performed on plastics with different heat resistance intensity, the lowest annular electric heater 52 is positioned at the output end of the hydraulic cylinder 51 and is connected, lifting of the annular electric heater 52 can be realized under the action of the hydraulic cylinder 51, the specific hydraulic cylinder 51 is connected to the bottom of the vibration unit 10, the hydraulic cylinder 51 is respectively arranged on the four side surfaces of the replacement electric heaters, the hydraulic cylinder 51 drives the annular electric heaters 52 to descend to wrap the plastics placed on the lower die 3, and preheating of the plastics can be performed and the plastics can be more uniform.
A layer of soundproof cotton 11 is attached to the inner wall of the frame 1, and the soundproof cotton 11 can effectively block noise transmission.
As shown in fig. 5: the infrared heating device 4 comprises an infrared heater 41 and a concave groove 42, wherein a reflecting mirror surface 43 matched with the concave groove 42 is arranged on the surface of the inner side of the concave groove 42, the notch of the concave groove 42 is sealed by a lens 44 and a connecting plate 45, one side of the connecting plate 45 positioned in the concave groove 42 is connected with the infrared heater 41, the infrared heater 41 emits heat energy, the heat energy is scattered by generating multiple reflections in the concave groove 42, and a uniform heat energy field is generated from the lens 44 through the lower die position, so that a uniform heating effect on common plastics is realized, and the infrared heating device 4 is used for preheating the common plastics to be welded.
As shown in fig. 6-7: the vibration unit 4 is connected with an I-shaped platform 8, and the overall shape of the platform is I-shaped "
The shape, structural strength is high, and after the long-time vibration use, deformation, bending, crack or even fracture phenomenon is difficult for appearing in the atress position of I shape platform 8, is favorable to improving welding process quality, and the upper plane of I shape platform 8 is connected with the vibrating unit 10 of welding machine, and the lower plane is connected with reinforcing plate 81, and the reinforcing plate is high temperature resistant hard steel board, and for prior art, this embodiment does not expand.
The size of the lower plane of the I-shaped platform 8 is larger than the size of the upper plane of the I-shaped platform, namely the size of the upper plane of the I-shaped platform is similar to the size of a welding head, the size of the lower plane of the I-shaped platform 8 is larger than the size of the upper plane of the I-shaped platform 8, the specific size is embodied on the length and the width, and the size of the lower plane of the I-shaped platform 8 is larger than the size of a welded object to be welded, so that the welding part with the welding area exceeding the area of the vibration head of the existing equipment can be prevented from being subjected to uneven pressure in the vibration process, and the welding of the welded part is uneven, the welding strength is uneven and the like.
The side surface of the I-shaped platform 8 is provided with a plurality of reinforcing ribs 82, two sides of the I-shaped platform corresponding to the width direction are provided with a plurality of I-shaped notches 83, I-shaped fastening strips can be embedded in the I-shaped notches 83, the I-shaped notches 83 are symmetrically distributed by taking the central line of the corresponding side surface of the I-shaped platform 8 as a symmetrical axis, and one end of the I-shaped platform 8 is connected with an upper die 9; the lower table-board 7 is provided with a lower die 3 corresponding to the upper die 9.
As shown in fig. 8-9: the back of frame 1 articulates there is door 12, be provided with silencing device 13 on the door 12, silencing device 13 includes a plurality of vibrating tube racks 131, the sill pillar 132, because vibrating tube racks 131 have certain weight, set up sill pillar 132 in vibrating tube racks 131's bottom, mainly play the effect of supporting and fixed, vibrating tube racks 131 pass through the sill pillar and connect on door 12, vibrating tube racks 131's inside is provided with a plurality of cross skeleton 1311 that link to each other in proper order, cross skeleton 1311's setting is used for restricting sand 1314 and carries out the harmonic motion along with equipment in vertical direction or horizontal direction, thereby effectively absorb the noise that is brought by equipment vibration, and can reduce the use amount of sand grain in a certain extent.
The cross-shaped framework 1311 divides the internal space of the vibrating tube rack 131 into a vertical channel 1312 and a transverse channel 1313, granular sand particles 1314 are arranged in the vibrating tube rack 131, the total volume of the sand particles 1314 occupies 95-98% of the total volume of the vertical channel 1312 and the transverse channel 1313, the sand particles 5 can be square, round and other granular shapes, and the smaller the volume is, the better the smaller the volume is, the smaller the sand particles need only a tiny space to be vibrated in the channel of the vibrating tube rack 131.
The above-described embodiments are intended to suggest that, in view of the above description, various changes and modifications may be made by the worker without departing from the spirit of the invention. The technical scope of the present invention is not limited to the description, but the scope of protection must be determined according to the scope of claims.

Claims (6)

1. The utility model provides a plastics vibration friction welding machine with preheating device, includes frame (1), sets up pressure adjustment unit (2) in the frame, with the lower mesa (7) that this pressure adjustment unit links to each other can adjust from top to bottom, set up vibration unit (10), last mould (9), lower mould (3) on frame (1), its characterized in that: an infrared heating device (4) is arranged on the lower table top (7) and positioned on two sides of the pressure regulating unit (2); an electric heating device (5) is arranged on the vibration unit (10), the electric heating device (5) comprises a hydraulic cylinder (51) and a plurality of annular electric heaters (52), the output ends of the annular electric heaters (52) are connected with the hydraulic cylinder (51), the annular electric heaters (52) can be lifted under the action of the hydraulic cylinder (51), and a heat conducting plate (6) is arranged on the lower die (3); a layer of soundproof cotton (11) is attached to the inner wall of the frame (1); the annular electric heaters (52) are arranged on the periphery of the upper die (9) and are sequentially arranged in the vertical direction, and the power of the annular electric heaters (52) is sequentially increased from top to bottom in the vertical direction; the infrared heating device (4) comprises an infrared heater (41) and a concave groove (42), a reflecting mirror surface (43) matched with the concave groove (42) is arranged on the surface of the inner side of the concave groove (42), the notch of the concave groove (42) is sealed through a lens (44) and a connecting plate (45), and one side of the connecting plate (45) positioned inside the concave groove (42) is connected with the infrared heater (41).
2. A plastic vibration friction welder with a preheating device according to claim 1, characterized in that: the vibration unit is connected with an I-shaped platform (8), and one end of the I-shaped platform (8) is connected with an upper die (9); the upper plane of the I-shaped platform (8) is connected with a vibration unit (10) of the welding machine, and the lower plane is connected with a reinforcing plate (81); the dimension of the lower plane of the I-shaped platform (8) is larger than that of the upper plane of the I-shaped platform.
3. A plastic vibration friction welder with a preheating device according to claim 2, characterized in that: the side of I shape platform (8) is provided with a plurality of strengthening ribs (82), and its corresponding both sides along width direction are provided with a plurality of I shape notch (83), but embedded installation, dismantlement I shape fastening strip in I shape notch (83), I shape notch (83) use the central line of I shape platform (8) corresponding side to be the symmetry axis symmetric distribution.
4. A plastic vibration friction welder with a preheating device according to claim 1, characterized in that: the back of frame (1) articulates there is door (12), be provided with silencing device (13) on door (12), silencing device (13) are including a plurality of vibration pipe support (131), sill pillar (132), vibration pipe support (131) are connected on door (12) through the sill pillar.
5. A plastic vibration friction welder with a preheating device according to claim 4, characterized in that: the inside of vibration pipe support (131) is provided with a plurality of cross skeleton (1311) that link to each other in proper order, cross skeleton (1311) divide into vertical passageway (1312) and transverse channel (1313) with the inner space of its vibration pipe support (131).
6. A plastic vibration friction welder with a preheating device according to claim 5, characterized in that: the inside of the vibrating tube rack (131) is provided with granular sand grains (1314), and the total volume of the sand grains (1314) occupies 95-98% of the total volume of the vertical channels (1312) and the transverse channels (1313).
CN201810621321.1A 2018-06-15 2018-06-15 Plastic vibration friction welding machine with preheating device Active CN108773077B (en)

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CN201810621321.1A CN108773077B (en) 2018-06-15 2018-06-15 Plastic vibration friction welding machine with preheating device

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Application Number Priority Date Filing Date Title
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CN108773077A CN108773077A (en) 2018-11-09
CN108773077B true CN108773077B (en) 2024-04-05

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4154641A (en) * 1978-04-24 1979-05-15 Neumann Engineering & Manufacturing Company Apparatus for vibration welding thermoplastic parts
DE202005007282U1 (en) * 2005-05-02 2005-07-07 Bielomatik Leuze Gmbh + Co.Kg Vibration welding plant for welding plastic or plastic composite components has drive unit acting in conjunction with stroking drive unit to produce a set horizontal movement of the lower tool
DE102004047113A1 (en) * 2004-09-27 2006-04-06 Faurecia Innenraum Systeme Gmbh Plastic component for a friction welding process has recesses in the surface to be welded onto another component
CN201295751Y (en) * 2008-11-18 2009-08-26 浙江大学 Ultrasonic vibration auxiliary semisolid metal micro thixotropic molding device
CN202428665U (en) * 2011-12-12 2012-09-12 必能信超声(上海)有限公司 Vibrating friction welding machine with heating device
CN202668988U (en) * 2011-12-15 2013-01-16 必能信超声(上海)有限公司 System for controlling vibration friction wielding machine with heating device
CN103920985A (en) * 2014-04-10 2014-07-16 中国兵器工业第五九研究所 Fast preheating unit for thin-walled pipe type part axial friction welding
CN203766226U (en) * 2014-04-08 2014-08-13 李国新 Far infrared pad printing machine
CN104385577A (en) * 2014-09-25 2015-03-04 江苏大学 Laser transmission welding clamping apparatus capable of achieving any curved surface welding
CN107218799A (en) * 2017-07-31 2017-09-29 绵阳力洋英伦科技有限公司 A kind of reflective devices unit and spliced heater and its heater system
CN107984077A (en) * 2017-12-29 2018-05-04 苏州凯尔博精密机械有限公司 A kind of infrared preheating friction welding machine
CN108081618A (en) * 2017-11-29 2018-05-29 上海交通大学 A kind of vibration friction welding machine with bilateral preheating apparatus

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4154641A (en) * 1978-04-24 1979-05-15 Neumann Engineering & Manufacturing Company Apparatus for vibration welding thermoplastic parts
DE102004047113A1 (en) * 2004-09-27 2006-04-06 Faurecia Innenraum Systeme Gmbh Plastic component for a friction welding process has recesses in the surface to be welded onto another component
DE202005007282U1 (en) * 2005-05-02 2005-07-07 Bielomatik Leuze Gmbh + Co.Kg Vibration welding plant for welding plastic or plastic composite components has drive unit acting in conjunction with stroking drive unit to produce a set horizontal movement of the lower tool
CN201295751Y (en) * 2008-11-18 2009-08-26 浙江大学 Ultrasonic vibration auxiliary semisolid metal micro thixotropic molding device
CN202428665U (en) * 2011-12-12 2012-09-12 必能信超声(上海)有限公司 Vibrating friction welding machine with heating device
CN202668988U (en) * 2011-12-15 2013-01-16 必能信超声(上海)有限公司 System for controlling vibration friction wielding machine with heating device
CN203766226U (en) * 2014-04-08 2014-08-13 李国新 Far infrared pad printing machine
CN103920985A (en) * 2014-04-10 2014-07-16 中国兵器工业第五九研究所 Fast preheating unit for thin-walled pipe type part axial friction welding
CN104385577A (en) * 2014-09-25 2015-03-04 江苏大学 Laser transmission welding clamping apparatus capable of achieving any curved surface welding
CN107218799A (en) * 2017-07-31 2017-09-29 绵阳力洋英伦科技有限公司 A kind of reflective devices unit and spliced heater and its heater system
CN108081618A (en) * 2017-11-29 2018-05-29 上海交通大学 A kind of vibration friction welding machine with bilateral preheating apparatus
CN107984077A (en) * 2017-12-29 2018-05-04 苏州凯尔博精密机械有限公司 A kind of infrared preheating friction welding machine

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