CN114657351B - Local heat treatment method and device for small contact - Google Patents

Local heat treatment method and device for small contact Download PDF

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Publication number
CN114657351B
CN114657351B CN202210296671.1A CN202210296671A CN114657351B CN 114657351 B CN114657351 B CN 114657351B CN 202210296671 A CN202210296671 A CN 202210296671A CN 114657351 B CN114657351 B CN 114657351B
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contact
carrier strip
heat treatment
miniature
torch
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CN114657351A (en
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曹先铭
何浩
徐志波
刘晰
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Guizhou Space Appliance Co Ltd
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Guizhou Space Appliance Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/32—Soft annealing, e.g. spheroidising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The utility model provides a local heat treatment device of small-size contact, includes the horizontal migration module that sets up on the mesa, the horizontal migration module can follow its axial and reciprocate, still includes: the box body is arranged on the horizontal movement module through a connecting plate; the carrier strip is arranged in the box body, the length direction of the carrier strip is parallel to the reciprocating motion direction of the horizontal moving module, and a plurality of mounting holes are formed in the top surface of the carrier strip along the length direction of the carrier strip and used for placing the contact pieces; the fixed bracket is arranged on the table top; the miniature torch is arranged on the fixed bracket and can slide up and down on the fixed bracket; the nozzle of the miniature torch faces the contact piece; the cooling spray pipe is arranged on the fixed bracket and is arranged at intervals with the miniature torch, and a water outlet of the cooling spray pipe faces to the contact piece; the interval distance between the miniature torch nozzle and the water outlet of the cooling spray pipe is equal to the interval distance between two adjacent contact pieces.

Description

Local heat treatment method and device for small contact
Technical Field
The invention relates to the technical field of heat treatment processing of electric connectors, in particular to a local heat treatment method and device for a small contact.
Background
The contact (finger pin, jack) used in the connector requires low hardness and good shaping of the crimp wire segment, while the butt-joint use segment has high strength and high hardness, so that the contact crimp wire segment needs to be subjected to local heat treatment. At present, high-frequency local heat treatment is commonly used for local heat treatment of metal in industry, but for small-diameter contact pieces, the high-frequency heating time is long, the efficiency is low, the heating is unstable, the position precision of the local heat treatment is not ideal, automation is inconvenient to realize, and the process requirements cannot be well met.
Some related patents in the prior art disclose heat treatment apparatuses and heat treatment methods.
Such as: the patent of application number CN201721216357.9 discloses a conveyor for intermediate frequency quenching, including intermediate frequency quenching machine and basin, intermediate frequency quenching machine one side top is equipped with the heating mantle, and heating mantle one side connects induction coil, the fixing base is installed to the bottom in the basin, and the fixing base top passes through the bolt installation protection casing, rotate the motor through the mounting bracket installation in the protection casing, and rotate the motor top and pass through the drive shaft installation rolling disc, install gear motor in the drive shaft of rotating the motor, protection casing top installation water knockout drum, and the water knockout drum is located the rolling disc bottom, water knockout drum one side is through the small-size water pump delivery port of pipe connection, and small-size water pump water inlet connection drain pipe, the shower nozzle is installed at water knockout drum top. The patent makes the gear rotate at a constant speed through the gear motor, recovers hot water produced by processing in the water tank through the water tank, cools water in the water tank through the water pipe by the water chiller, conveys the water to the water tank through the pressure pump, and forms good cooling water circulation.
For another example, patent application number CN202010138356.7 discloses a local contact softening device, which accurately and reliably performs contact softening in a full-automatic manner through gravity positioning of parts; the vibration disc is used for screening the directions of the parts, continuously feeding, reversing the screened parts through the conveying mechanism, conveying the parts to the working position of the softening mechanism, and heating the local positions of the contact parts through the high-frequency induction heating equipment, so that the plasticity of the positions of the contact parts, which are required to be bent or pressed, is enhanced, and cracks are avoided.
However, the above prior art patents are not suitable for heat treatment of small-sized contact elements of electrical connectors, such as pins and sockets, and still have problems of long time for high-frequency heating, low efficiency, unstable heating, unsatisfactory positional accuracy of local heat treatment, and the like for small-diameter contact elements.
Disclosure of Invention
The invention mainly aims to provide a local heat treatment method and device for a small contact piece, and aims to solve the technical problems.
In order to achieve the above object, in one aspect, the present invention provides a local heat treatment device for a small-sized contact, including a horizontal movement module disposed on a table, the horizontal movement module being capable of performing a reciprocating movement along an axial direction thereof, and further including: the box body is arranged on the horizontal movement module through a connecting plate;
the carrier strip is arranged in the box body, the length direction of the carrier strip is parallel to the reciprocating motion direction of the horizontal moving module, and a plurality of mounting holes are formed in the top surface of the carrier strip along the length direction of the carrier strip and used for placing the contact pieces;
the fixed bracket is arranged on the table top;
the miniature torch is arranged on the fixed bracket and can slide up and down on the fixed bracket; the nozzle of the miniature torch faces the contact piece;
the cooling spray pipe is arranged on the fixed bracket and is arranged at intervals with the miniature torch, and a water outlet of the cooling spray pipe faces to the contact piece;
the interval distance between the miniature torch nozzle and the water outlet of the cooling spray pipe is equal to the interval distance between two adjacent contact pieces.
Preferably, a water tank is arranged on the table top and is positioned below the box body, and a through hole is arranged on the bottom wall of the box body and aligned with the water tank; the water tank is connected with the water tank through a pipeline; the cooling spray pipe is connected with a water pump in the water tank through a pipeline.
Preferably, the miniature torch further comprises a power component, wherein the power component is installed on the fixed support and used for driving the miniature torch to move up and down.
Preferably, the miniature torch is slidably mounted on the fixed support through a sliding rail and a sliding block, the sliding rail is in sliding fit with the sliding block, the miniature torch is arranged on the sliding block, and the sliding rail is arranged on the fixed support; the power component is an air cylinder; the actuating end of the cylinder is connected with the sliding block.
Preferably, the table top is arranged at the top of the vehicle body; universal wheels and adjusting supports are arranged at four corners of the bottom of the car body.
Preferably, the water outlet of the cooling spray pipe is vertically downward and is located above the contact member; the nozzle of the miniature torch is arranged on one side of the carrier strip, and the axis of the nozzle of the miniature torch is perpendicular to the long side surface of the carrier strip; and in the length direction along the carrier strip, the interval distance between the miniature torch nozzle and the cooling spray pipe water outflow opening is 5-10 cm.
Preferably, a cavity is arranged in the carrier strip, and cooling water is filled in the cavity; the lower ends of the contact pieces are immersed in cooling water.
Preferably, the table top is provided with a stand column, and the stand column is provided with a vertical chute; baffle plates are arranged between the adjacent upright posts, and two ends of each baffle plate are respectively arranged in the vertical sliding groove.
On the other hand, the invention also provides a local heat treatment method of the small-sized contact, and the local heat treatment device adopting the small-sized contact comprises the following steps:
step S1: placing the contact on the mounting hole of the carrier strip;
step S2: placing the carrier strip on a box body of the horizontal movement module, and adjusting the height of the miniature torch up and down according to the part of the contact piece, which needs local heat treatment;
step S3: igniting the micro torch, and starting the cooling spray pipe to enable cooling water to flow out of the cooling spray pipe;
step S4: starting a horizontal moving module to drive the carrier strip to move so that the contact pieces sequentially move through the flame and cooling water at the front section of the micro torch, and after all the contact pieces are heated and cooled, moving the micro torch upwards, wherein the horizontal moving module drives the carrier strip with the contact pieces to return to the original position, so that the local flame heat treatment of the contact pieces on the whole carrier strip is realized;
step S5: and (3) replacing another carrier strip filled with the contact pieces, and repeating the operation of the step S4 to realize the local heat treatment of the batch production of the parts.
Preferably, the horizontal movement speed of the contact piece before the micro torch flame is 2.4cm/s.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) According to the invention, the horizontal moving module is adopted to drive the carrier strip to move, so that the contact piece is driven to sequentially move through the flame at the front section of the miniature torch to heat and the cooling spray pipe to cool, and the local heat treatment is completed. The carrier strip is utilized to load the contact, the mounting holes on the carrier strip can be used for making the aperture and the depth according to the diameter of the contact and the length of the local heat treatment, and the parts of the contact which need to be subjected to the local heat treatment are exposed out of the carrier strip holes, and the parts which do not need to be subjected to the heat treatment are buried in the carrier strip holes so as to protect the parts from being influenced by flame temperature.
(2) In the invention, as the interval distance between the micro torch nozzle and the water outlet of the cooling spray pipe is equal to the interval distance between the two adjacent contact pieces, the micro torch can heat the contact pieces and simultaneously the cooling spray pipe can align the heated contact pieces, and the heated contact pieces are subjected to cooling quenching treatment. The structure enables the miniature torch and the cooling spray pipe to treat the contact piece at the same time, and effectively improves the heat treatment efficiency. The horizontal movement speed of the contact piece is controlled by utilizing the horizontal movement module, so that the horizontal movement speed of the contact piece is controlled, and the heating time and the quenching time are conveniently controlled.
(3) According to the invention, the cooling system of the heat treatment device is formed by the box body, the water tank, the water pump and the cooling spray pipe, when the cooling spray pipe sprays water for cooling and quenching, the quenching water firstly falls onto the box body, and as the through holes are arranged on the bottom wall of the box body and are aligned with the water tank, the quenching water in the box body flows into the water tank through the through holes on the bottom wall, the quenching water collected in the water tank flows back to the water tank through the pipeline, and the quenching water in the water tank is conveyed to the cooling spray pipe through the water pump for cooling and quenching the contact piece, and the recycling of the quenching water is realized through the cooling system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a device for local heat treatment of a small-sized contact according to the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is an enlarged view at B in FIG. 1;
FIG. 4 is a schematic view of the contact assembly on a carrier strip (carrier strip without cavities) according to the present invention;
fig. 5 is a schematic view of the structure of the contact member assembled on the carrier strip (the carrier strip is provided with the cavity) in the present invention.
The reference numerals are for illustration: 1-a horizontal movement module; 101-a box body; 102-connecting plates; 2-carrier bars; 21-mounting holes; 22-cavity; 3-an actuation button; 4-a water tank; 5-a water pump; 6-fixing a bracket; 601-a slide rail; 602-a slider; 7-cylinder; 8-a miniature torch; 9-a water tank; 10-cooling the spray pipe; 11-a baffle; 12-contacts; 200-table top; 201-a vehicle body; 202-universal wheels; 203-adjusting the support; 204-stand columns; 205-vertical chute.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Examples:
referring to fig. 1, a local heat treatment device for a small-sized contact includes a horizontal movement module 1 disposed on a table 200, and is controlled by a PLC device to reciprocate along an axial direction thereof, and further includes:
the box body 101 is arranged on the horizontal movement module 1 through a connecting plate 102;
the carrier strip 2 is arranged in the box body 1, the length direction of the carrier strip 2 is parallel to the reciprocating motion direction of the horizontal movement module 1, and a plurality of mounting holes 21 are arranged on the top surface of the carrier strip 2 along the length direction of the carrier strip for placing the contact pieces 12; the diameter and depth of the mounting hole 21 are matched with those of the contact 12, the part of the contact 12 which needs to be subjected to local heat treatment is exposed out of the carrier strip 2, and the part which does not need to be subjected to heat treatment is buried in the mounting hole 21 of the carrier strip 2, so that the contact 12 is protected from the flame temperature;
a fixed bracket 6 provided on the table 200;
the miniature torch 8 is arranged on the fixed bracket 6 and can slide up and down on the fixed bracket 6; the nozzle of the micro torch 8 is directed towards the contact 12; the miniature torch 8 is connected with a liquefied petroleum gas cylinder and an oxygen cylinder through a hose and is used for providing heat;
a cooling spray pipe 10 which is arranged on the fixed bracket 6 and is arranged at intervals with the micro torch 8, wherein a water outlet of the cooling spray pipe 10 faces to the contact piece 12;
the distance between the nozzle of the miniature torch 8 and the water outlet of the cooling spray pipe 10 is equal to the distance between two adjacent contact pieces 12.
The horizontal moving module 1 is utilized to drive the carrier strip 2 to move, so that the contact 12 is driven to sequentially move through the flame of the front section of the miniature torch 8 to heat and the cooling spray pipe 10 to cool and quench, and the local heat treatment is completed. The horizontal movement module 1 can adjust its movement speed according to the diameter and flame size of the contact member, so as to stabilize the heating temperature and time of the contact member 12.
As shown in fig. 1, a water tank 9 is disposed on the table 200, the water tank 9 is located below the box 101, and a through hole is disposed on the bottom wall of the box 101 and aligned with the water tank 9; the heat treatment device also comprises a water tank 4, wherein the water tank 9 is connected with the water tank 4 through a pipeline; the cooling spray pipe 10 is connected with the water pump 5 inside the water tank 4 through a pipeline. By utilizing the box body 101, the water tank 9, the water tank 4, the water pump 5 and the cooling spray pipe 10 together to form a cooling system of the heat treatment device, when the cooling spray pipe 10 sprays water for cooling quenching, the quenching water firstly falls onto the box body 101, and as the through holes on the bottom wall of the box body 101 are aligned with the water tank 9, the quenching water in the box body 101 flows into the water tank 9 through the through holes on the bottom wall, the quenching water collected in the water tank 9 flows back to the water tank 4 through a pipeline, and the quenching water in the water tank 4 is conveyed to the cooling spray pipe 10 through the water pump 5 for cooling quenching the contact piece 12, and the recycling of the quenching water is realized through the cooling system.
As shown in fig. 1 and 2, the heat treatment device further comprises a power assembly, wherein the power assembly is installed on the fixed bracket 6 and is used for driving the micro torch 8 to move up and down. Specifically, the micro torch 8 is slidably mounted on the fixed support 6 through a sliding rail 601 and a sliding block 602, the sliding rail 601 is in sliding fit with the sliding block 602, the micro torch 8 is arranged on the sliding block 602, and the sliding rail 601 is arranged on the fixed support 6; the power component is a cylinder 7; the actuating end of the cylinder 7 is connected to the slide 602. The air cylinder 7 is controlled by a PLC component and is mainly used for controlling and adjusting the height of the miniature torch 8.
As shown in fig. 1, the heat treatment apparatus further includes a vehicle body 201, and the table 200 is disposed on top of the vehicle body 201; universal wheels 202 and adjustment bearings 203 are provided at the bottom four corners of the vehicle body 201. By utilizing the vehicle body 201, the whole heat treatment apparatus is convenient to move, the height of the adjusting support 203 can be adjusted, and the table top 200 can be adjusted to be in a horizontal state; secondly, the supporting function is achieved, and the vehicle body 201 is supported and prevented from sliding after moving into place.
As shown in fig. 1 and 2, in this embodiment, the water outlet of the cooling nozzle 10 is vertically downward and is located above the contact member 12; the nozzle of the miniature torch 8 is arranged on one side of the carrier strip 2, and the axis of the nozzle of the miniature torch 8 is perpendicular to the long side surface of the carrier strip 2; in the length direction along the carrier strip 2, the interval distance between the nozzle of the miniature torch 8 and the water outlet of the cooling spray pipe 10 is 5-10 cm. The micro torch 8 is in the form of side heating, and the flame is easily dispersed to the part of the contact 12 where the local heat treatment is required. The water flow of the cooling spray pipe 10 adopts a vertically downward mode, the water flow downwards from the top of the contact piece 12, and a water curtain formed by the action of gravity can be well covered on the contact piece 12, so that the contact piece 12 can be cooled and quenched better. Because the interval distance between the nozzle of the micro torch 8 and the water outlet of the cooling spray pipe 10 is equal to the interval distance between two adjacent contact pieces 12, the interval distance is 5-10 cm, so that the micro torch 8 can heat the contact pieces 12 and simultaneously the cooling spray pipe 10 can be aligned with the heated contact pieces 12, and the cooling quenching treatment is carried out. The structure enables the miniature torch 8 and the cooling spray pipe 10 to treat the contact piece at the same time, and effectively improves the heat treatment efficiency.
As shown in fig. 4 and 5, the following two types of carrier tapes 2 are provided in this embodiment.
The first type of carrier strip 2 is provided with 20 mounting holes 21, and the inside of the carrier strip 2 of the first type is not provided with a cavity, which is suitable for a contact piece with the diameter smaller than 4 mm; in use, the part of the contact 12 that needs to be subjected to the local heat treatment is exposed outside the carrier strip 2, and the part that does not need to be subjected to the heat treatment is buried in the carrier strip 2.
The second type of carrier strip 2 is provided with a cavity 22 inside, cooling water is filled in the cavity 22, and 38 mounting holes 21 are arranged on the carrier strip 2; when the contact 12 is mounted in the mounting hole 21, the lower end of the contact 12 is immersed in the cooling water. With this type of carrier strip 2, the parts of the contact 12 that need to be subjected to the local heat treatment are exposed to the outside of the carrier strip 2, and the parts that do not need to be subjected to the heat treatment are immersed in the cooling water in the cavity 22 of the carrier strip, further protecting them from the flame temperature. Carrier strip 2 of this type is suitable for use with contacts having a diameter of 4 to 6 mm.
Referring to fig. 1 and 3, a stand column 204 is provided on the table 200, and a vertical chute 205 is provided on the stand column 204; baffle plates 11 are arranged between the adjacent upright posts 204, and two ends of each baffle plate 11 are respectively arranged in the vertical sliding grooves 205. By providing the baffle 11, the heating device is mainly used for enclosing the components of the carrier strip 2, the micro torch 8, the cooling spray pipe 10 and the like of the heating device inside. Firstly, the burning of high-temperature flame to operators is avoided; and secondly, splashing caused by cooling water for cooling the spray pipe 10 can be avoided. Meanwhile, the baffle 11 is installed by adopting the vertical chute 205, and can slide up and down in the vertical chute 205, so that the baffle 11 can be pulled out when the carrier strip 2 is taken and put out, and the operation of workers is facilitated.
On the other hand, the invention also provides a local heat treatment method of the small-sized contact, and the local heat treatment device adopting the small-sized contact comprises the following steps:
step S1: placing the contact 12 on the mounting hole 21 of the carrier strip 2;
step S2: the carrier strip 2 is placed on the box body 101 of the horizontal movement module 1, and the height of the micro torch 8 is adjusted up and down according to the part of the contact piece 12 needing local heat treatment;
step S3: igniting the micro torch 8, and starting the cooling spray pipe 10 to enable cooling water to flow out of the cooling spray pipe 10;
step S4: starting the horizontal movement module 1 to drive the carrier strip 2 to move so that the contact pieces 12 sequentially move through the flame and cooling water at the front section of the micro torch 8, and after all the contact pieces 12 are heated and cooled, moving the micro torch 8 upwards, wherein the horizontal movement module 1 drives the carrier strip 2 with the contact pieces 12 to return to the original position, so that the local flame heat treatment of the contact pieces on the whole carrier strip 2 is realized;
step S5: and (4) replacing another carrier strip 2 filled with the contact pieces, and repeating the operation of the step (S4) to realize the local heat treatment of the batch production of the parts.
Specifically, in step S4, the horizontal movement speed of the contact 12 before the flame of the micro torch 8 is controlled to be 2.4cm/S by horizontally moving the module 1.
Application example one:
the diameter of the soft segment of a certain type of tin bronze contact part of a company is phi 1.2mm, the height of the soft segment is 5mm, the hardness before soft is about 240HV, and the non-soft segment cannot be soft.
The first type of carrier strip 2 is selected for preparation, and the contact 12 is vertically placed in the carrier strip 2 with the aperture matched with the contact 12 through a manual work or a sieve plate, so that a protection section of the contact 12 without local heat treatment is buried in a hole of the carrier strip 2, and 5mm of the contact 12 which needs local heat treatment is exposed out of the carrier strip 2.
According to the position of the contact 12 needing local heat treatment, the height of the micro torch 8 is adjusted up and down, so that the nozzle of the micro torch 8 is opposite to the center of the part needing local softening, and after the adjustment, the micro torch 8 is fixed on the fixed support 6.
The miniature torch 8 is connected with oxygen and an liquefied petroleum gas cylinder through a hose, a liquefied petroleum gas cylinder valve is slowly opened, the miniature torch 8 is ignited, and the flame size is regulated by slowly regulating the size of the oxygen cylinder valve, so that the flame is stable, and the processing consistency is ensured; the baffle 11 blocks the flame after-flame after heating, and avoids safety accidents caused by the excessive injection of the after-flame.
The cooling spray pipe 10 is vertically fixed at the position 5cm behind the miniature torch 8 and is connected with the water pump 5 through a pipeline, the water pump 5 is started, and cooling water vertically flows down at the position 5cm behind the miniature torch 8.
The procedure was set so that the horizontal movement speed of the contact 12 in front of the flame gun was 2.4cm/s. The start button 3 is pressed down, the horizontal movement module 1 drives the carrier strip 2 to enable the contact pieces 12 to sequentially move through flame and cooling water at a constant speed, the contact pieces 12 are heated by the flame and burned to be red, then the cooling water is used for cooling and quenching, and the partial quenching and softening treatment of all the contact pieces 12 on the carrier strip 2 is completed, wherein the hardness value of the soft-withdrawing and softening section is 110-140 HV. After all the contact pieces 12 are heated and cooled, the air cylinder 7 acts upwards to vertically lift the micro torch 8 by 5cm, and the horizontal movement module 1 drives the carrier strip 2 with the contact pieces 12 to move back to the original point; another carrier strip 2 filled with the contact pieces 12 is replaced in the box body 101 of the horizontal moving module 1, and the operation is repeated to carry out part batch production.
Application example II:
the diameter of the soft-removing section of a certain type of contact piece of a company is phi 5mm, the height of the soft-removing section is 4mm, the hardness before soft-removing is about 240HV, and the non-soft-removing section cannot be soft-removed.
The method comprises the steps of preparing, selecting a second type of carrier strip 2, vertically placing the contact 12 in the carrier strip 2 with the aperture matched with the contact by manpower or a sieve plate, placing cooling water in a cavity 22 of the carrier strip 2, immersing a protection section of the contact 12 which does not need to be subjected to local heat treatment in the cooling water, and exposing a 4mm soft-withdrawing section which needs to be subjected to local heat treatment outside the carrier strip 2.
According to the position of the contact 12 needing local heat treatment, the height of the micro torch 8 is adjusted up and down, so that the nozzle of the micro torch 8 is opposite to the center of the part needing local softening, and after the adjustment, the micro torch 8 is fixed on the fixed support 6.
The miniature torch 8 is connected with oxygen and an liquefied petroleum gas cylinder through a hose, a liquefied petroleum gas cylinder valve is slowly opened, the miniature torch 8 is ignited, and the flame size is regulated by slowly regulating the size of the oxygen cylinder valve, so that the flame is stable, and the processing consistency is ensured; the baffle 11 blocks the flame after-flame after heating, and avoids safety accidents caused by the excessive injection of the after-flame.
The cooling spray pipe 10 is vertically fixed at the position 5cm behind the miniature torch 8 and is connected with the water pump 5 through a pipeline, the water pump 5 is started, and cooling water vertically flows down at the position 5cm behind the miniature torch 8.
The procedure was set so that the horizontal movement speed of the contact 12 in front of the flame gun was 2.4cm/s. The start button 3 is pressed down, the horizontal movement module 1 drives the carrier strip 2 to enable the contact pieces 12 to sequentially move through flame and cooling water at a constant speed, the contact pieces 12 are heated by the flame and burned to be red, then the cooling water is used for cooling and quenching, and the partial quenching and softening treatment of all the contact pieces 12 on the carrier strip 2 is completed, wherein the hardness value of the soft-withdrawing and softening section is 110-140 HV. After all the contact pieces 12 are heated and cooled, the air cylinder 7 acts upwards to vertically lift the micro torch 8 by 5cm, and the horizontal movement module 1 drives the carrier strip 2 with the contact pieces 12 to move back to the original point; another carrier strip 2 filled with the contact pieces 12 is replaced in the box body 101 of the horizontal moving module 1, and the operation is repeated to carry out part batch production.
The invention realizes the local heat treatment of the small-diameter contact pieces on various types of connectors of companies, has high part processing efficiency, good consistency, good quality, convenient and fast operation and clean operation, and only needs to replace carrier strips with corresponding apertures and types aiming at the contact pieces with different diameters, thereby having strong compatibility and low cost.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather, the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (9)

1. The utility model provides a local heat treatment device of small-size contact, includes horizontal migration module (1) of setting on mesa (200), horizontal migration module (1) can follow its axial and reciprocate, its characterized in that still includes:
the box body (101) is arranged on the horizontal movement module (1) through a connecting plate (102);
the carrier strip (2) is arranged in the box body (1), the length direction of the carrier strip (2) is parallel to the reciprocating motion direction of the horizontal moving module (1), and a plurality of mounting holes (21) are formed in the top surface of the carrier strip (2) along the length direction of the carrier strip and are used for placing the contact pieces (12);
a fixed bracket (6) arranged on the table top (200);
the miniature torch (8) is arranged on the fixed bracket (6) and can slide up and down on the fixed bracket (6); the nozzle of the mini torch (8) is directed towards the contact (12);
the cooling spray pipe (10) is arranged on the fixed bracket (6) and is arranged at intervals with the miniature torch (8), and a water outlet of the cooling spray pipe (10) faces the contact piece (12);
the interval distance between the nozzle of the miniature torch (8) and the water outlet of the cooling spray pipe (10) is equal to the interval distance between two adjacent contact pieces (12);
a cavity (22) is arranged in the carrier strip (2), and cooling water is filled in the cavity (22); the lower end of the contact member (12) is immersed in cooling water.
2. A localized heat treatment device for a miniature contact as set forth in claim 1 wherein: a water tank (9) is arranged on the table top (200), the water tank (9) is positioned below the box body (101), and a through hole is arranged on the bottom wall of the box body (101) and aligned with the water tank (9);
the water tank (4) is further included, and the water tank (9) is connected with the water tank (4) through a pipeline; the cooling spray pipe (10) is connected with a water pump (5) in the water tank (4) through a pipeline.
3. A localized heat treatment device for a miniature contact as set forth in claim 1 wherein: the miniature torch also comprises a power component, wherein the power component is arranged on the fixed support (6) and is used for driving the miniature torch (8) to move up and down.
4. A localized heat treatment device for a miniature contact as set forth in claim 3 wherein: the miniature torch (8) is slidably arranged on the fixed support (6) through a sliding rail (601) and a sliding block (602), the sliding rail (601) is in sliding fit with the sliding block (602), the miniature torch (8) is arranged on the sliding block (602), and the sliding rail (601) is arranged on the fixed support (6); the power component is a cylinder (7); the actuating end of the cylinder (7) is connected with the sliding block (602).
5. A localized heat treatment device for a miniature contact as set forth in claim 1 wherein: the table top (200) is arranged at the top of the vehicle body (201); universal wheels (202) and an adjusting support (203) are arranged at four corners of the bottom of the vehicle body (201).
6. A localized heat treatment device for a miniature contact as set forth in claim 1 wherein: the water outlet of the cooling spray pipe (10) is vertically downward and is positioned above the contact piece (12);
the nozzle of the miniature torch (8) is arranged on one side of the carrier strip (2), and the axis of the nozzle of the miniature torch (8) is perpendicular to the long side surface of the carrier strip (2);
in the length direction along the carrier strip (2), the interval distance between the nozzle of the miniature torch (8) and the water outlet of the cooling spray pipe (10) is 5-10 cm.
7. A localized heat treatment device for a miniature contact as set forth in claim 1 wherein: an upright post (204) is arranged on the table top (200), and a vertical chute (205) is arranged on the upright post (204);
baffle plates (11) are arranged between adjacent upright posts (204), and two ends of each baffle plate (11) are respectively arranged in the vertical sliding groove (205).
8. A method of local heat treatment of a small contact, characterized in that a local heat treatment apparatus for a small contact according to any one of claims 1 to 7 is employed, comprising the steps of:
step S1: placing the contact (12) on the mounting hole (21) of the carrier strip (2);
step S2: the carrier strip (2) is placed on a box body (101) of the horizontal movement module (1), and the height of the miniature torch (8) is adjusted up and down according to the part of the contact piece (12) which needs local heat treatment;
step S3: igniting the micro torch (8), and starting the cooling spray pipe (10) to enable cooling water to flow out of the cooling spray pipe (10);
step S4: starting a horizontal moving module (1), driving the carrier strip (2) to move so that the contact pieces (12) sequentially move through the flame and cooling water at the front section of the miniature torch (8), and after all the contact pieces (12) are heated and cooled, moving the miniature torch (8) upwards, wherein the horizontal moving module (1) drives the carrier strip (2) provided with the contact pieces (12) to return to the original position, so that the local flame heat treatment of the contact pieces on the whole carrier strip (2) is realized;
step S5: and (3) replacing another carrier strip (2) filled with the contact pieces, and repeating the operation of the step S4 to realize the local heat treatment of the batch production of the parts.
9. A method of localized heat treatment of a microcontact as defined in claim 8 wherein: the horizontal movement speed of the contact piece (12) before the flame of the miniature torch (8) is 2.4cm/s.
CN202210296671.1A 2022-03-24 2022-03-24 Local heat treatment method and device for small contact Active CN114657351B (en)

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CN114657351B true CN114657351B (en) 2023-05-05

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030048853A (en) * 2001-12-13 2003-06-25 현대자동차주식회사 Coolant suppling apparatus for flame hardening
CN109321737A (en) * 2018-10-31 2019-02-12 浙江康普瑞汽车零部件有限公司 Three pin shaft heat treatment toolings and three pin shaft process for quenching
CN112342348A (en) * 2020-11-05 2021-02-09 马鞍山威泰机电有限公司 Local precision heat treatment equipment for superfine parts

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030048853A (en) * 2001-12-13 2003-06-25 현대자동차주식회사 Coolant suppling apparatus for flame hardening
CN109321737A (en) * 2018-10-31 2019-02-12 浙江康普瑞汽车零部件有限公司 Three pin shaft heat treatment toolings and three pin shaft process for quenching
CN112342348A (en) * 2020-11-05 2021-02-09 马鞍山威泰机电有限公司 Local precision heat treatment equipment for superfine parts

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