A process method for heat shrinkage forming of a heat shrinkable sleeve at the cable tail

Abstract

The present invention provides a method for the manual heat shrinkage forming technology of the cable tail shrinkage sleeve in small-batch production under the premise of cost savings. First, for the purpose of reducing the continuous operation time, shrinking the area of the heat radiation region, and reducing the heating time, the heat shrinkage process of the shrinkage sleeve is split into two different heat shrinkage process stages, namely the pre-shrinkage process stage of the shrinkage sleeve and the final shrinkage process stage of the shrinkage sleeve after it is sleeved on the cable. Second, for the purpose of achieving a good appearance forming effect of the shrinkage sleeve, during the final shrinkage process stage of the shrinkage sleeve, the parts protected by the shrinkage sleeve in the cable core are heat shrunk with heat shrinkable tubes of different specifications as fillers, so as to achieve the effect that there are no voids or depressions at the formed part of the shrinkage sleeve held by hand, being firm and able to withstand force. Third, for the purpose of improving the poor qualified rate of the cable quality, the temperature settings, operation distances, and operation duration parameters of the hot air gun are respectively specified during the pre-shrinkage and final shrinkage stages of the shrinkage sleeve.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat shrink forming of upper die shrink sleeves for equipment cables, and mainly provides a process method for manual operation heat shrink forming of die shrink sleeves at the cable tail under the premise of saving the design cost of cable die shrink sleeve heat shrink devices in small batch production. Background Art

[0002] Die shrink sleeves are mainly used for mechanical protection and stress release of cable wire bundles and connectors. One end of the die shrink sleeve can be directly heat shrunk onto the thread of the tail accessory, and the other end is heat shrunk onto the cable core wire. Therefore, the cable die shrink sleeve is a core component that plays a protective role between the cable core wire and the cable connector. The heat shrink process method of the die shrink sleeve not only directly affects the shaping effect of the cable appearance, but also affects the reliability of signal transmission during use.

[0003] In mass cable production, the heat shrink forming technology of the die shrink sleeve at the cable tail usually requires the design of a die shrink sleeve heat shrink device. In small batch production, in order to save the cost of special tooling, it is usually implemented by manual operation using traditional process methods. The existing heat shrink process method technology of the die shrink sleeve is carried out according to the heat shrink method of ordinary heat shrink tubes. During the cable assembly process, after the die shrink sleeve is put on the positions of the tail accessory of the connector and the cable core wire that need to be protected, heat blowing is used for heat shrinking. During the heat shrink process, usually the operator holds a hot air gun and continuously heats the die shrink sleeve in a 360° circular manner from one end to the other end. In the traditional process of heat shrinking the heat shrink tube, it is only specified that the heat shrink tube needs to tightly wrap the material to be wrapped after heat shrinking and cannot move, and there are no standardized operation parameters for the use of the hot air gun. Therefore, after using the traditional process for heat shrink forming of the die shrink sleeve at the cable tail, the die shrink sleeve shrinks unevenly, resulting in poor cable appearance quality and even failing to achieve the protective effect between the cable core wire and the connector. Summary of the Invention

[0004] The present invention provides a process technology for heat shrink forming of a cable die shrink sleeve in small batch production to solve the technical problems in the prior art such as low production efficiency, poor cable appearance quality, and serious safety and quality hazards.

[0005] The present invention is realized by the following technical scheme: A process method for heat shrink forming of a die shrink sleeve at the cable tail includes a die shrink sleeve pre-shrinking treatment, a tail shaping treatment, and a die shrink sleeve final shrinking treatment process method;

[0006] The die shrink sleeve pre-shrinking treatment process method:

[0007] (1). Put the die shrink sleeve on one end of a smooth wooden stick, and the diameter of the wooden stick should be less than 1 / 2 of the maximum diameter of the die shrink sleeve;

[0008] (2) Set the hot air gun parameters as follows: temperature: 300 °C, air volume: 500 liters per minute;

[0009] (3) Hold one end of the wooden stick in one hand and the hot air gun in the other hand. Keep the hot air gun outlet 10 ± 2 cm away from the shrink sleeve and blow it along the direction from the large end to the small end of the shrink sleeve;

[0010] (4) After 10 ± 2 minutes, stop heat shrinking. The shrink sleeve will shrink to 2 / 3 of its diameter;

[0011] Tail shaping processing method:

[0012] (1) Bind the sleeve sleeved outside the wire at the end of the connector tail accessory and the wire with cotton string;

[0013] (2) First sleeve the heat shrinkable tube. The specifications of the heat shrinkable tube sleeved for the first time are as follows in the equation:

[0014] Length = shrink sleeve length - tail thread length

[0015] Diameter = wire outer sleeve diameter × 1.5

[0016] Quantity = 3 - 4 pieces;

[0017] (3) Sleeve the above heat shrinkable tubes to the end face near the tail accessory in sequence and heat shrink them. The heat shrinkable tubes in this step cover the large end and the small end of the tail accessory, and the heat shrinkable tubes are nested layer by layer;

[0018] (4) Second sleeve the heat shrinkable tube. The specifications of the heat shrinkable tube sleeved for the second time are as follows in the equation:

[0019] Length = shrink sleeve large end length + 3 - 5 mm

[0020] Diameter = wire outer sleeve diameter × 2

[0021] Quantity = 3 - 4 pieces;

[0022] (5) Sleeve the heat shrinkable tubes in step (4) to the end face near the tail accessory in sequence and heat shrink them. The heat shrinkable tubes in this step are only sleeved on the large end of the tail accessory, and the heat shrinkable tubes are nested layer by layer;

[0023] Final shrink processing method of the shrink sleeve:

[0024] (1) Sleeve the shrink sleeve on the tail accessory already sleeved with the heat shrinkable tube. The direction is that the large end of the shrink sleeve is sleeved on the thread of the tail accessory;

[0025] (2) Set the hot air gun parameters as follows: temperature: 300 °C, air volume: 500 liters per minute;

[0026] (3) At a position 10 ± 2 cm away from the shrink sleeve of the mold, blow and shrink along the direction from the small end to the large end of the shrink sleeve of the mold;

[0027] (4) After blowing and shrinking for 5 - 10 minutes, when the shrink sleeve of the mold shrinks thermally to tightly wrap the tail accessory and the cable to form a rigid connection, stop thermal shrinking.

[0028] The innovation points of this process method are as follows: ① The thermal shrinkage forming process of the shrink sleeve of the mold is divided into two process stages. During the cable production process, not only reasonable process arrangements are made for it, but also the process methods and parameters for its treatment are formulated. ② The forming technology of the shrink sleeve of the mold adopts the method of using a heat shrinkable tube as the filling material, and at the same time, its specifications and process methods are specified. This process method can not only solve problems such as low production efficiency, poor cable quality, and serious safety and quality hazards in the production process, but also enable the shrink sleeve of the mold to perfectly connect the tail accessory and the cable like a rigid road. It can not only achieve the expected quality in appearance, but also avoid damage to the internal wires caused by external forces or stress during use, realizing the long-term practicality of the cable and extending its service life.

[0029] Since the price of the shrink sleeve of the mold is over 200 yuan according to its shape and the forming process is irreversible, the cable production cost is high. In this process method, the filling material used is a common, frequently used, inexpensive, and easily purchasable material, and the heating tool used is a hot air gun, a professional heating tool frequently used in the electronics industry. Therefore, this process method has the characteristics of being easy to implement and convenient to operate. After the application of this process method, while improving production efficiency, it also improves the product quality qualification rate, controls the additional production cost, shortens the production cycle, and reduces quality accidents while solving safety hazards. Specific implementation method

[0030] In the existing cable assembly process, after putting the shrink sleeve of the mold on the tail accessory of the connector and the position where the cable core needs to be protected, use a hot air blower for thermal shrinking. During the thermal shrinking process, when the temperature of the hot air gun is set low, it takes at least about 1 hour of continuous heating to complete the blowing and shrinking process of a shrink sleeve of the mold. During the whole operation process, the operator holds the hot air gun to heat the shrink sleeve of the mold throughout the process, with high labor intensity and low efficiency. When the temperature of the hot air gun is set high, the area irradiated by the temperature of the hot air gun will heat up as the shrink sleeve of the mold is heated, which may cause safety and quality accidents such as burning of the nylon wire sleeve of the cable outer layer, burning of the outer skin of the cable wire, and even detachment of the solder joint from the contact part. Using the existing process method for the thermal shrinkage forming of the shrink sleeve at the cable tail may also cause problems such as uneven surface of the shrink sleeve of the mold and abnormal shape at the open end of the shrink sleeve of the mold, resulting in poor appearance quality and thus the shrink sleeve of the mold not being able to play a protective role between the cable core and the connector.

[0031] The purpose of the design of the heat shrink forming process method for the cable tail shrinkage sleeve of the present invention is to provide a process technology for heat shrink forming of cable shrinkage sleeves in small batch production, so as to solve the problems of low production efficiency, poor cable quality, and serious safety and quality hazards caused by the unreasonable process methods in the prior art, such as long continuous labor time, large heat radiation area, and long heating time.

[0032] To achieve the above purpose, the technical solution provided by the present invention is as follows: First, in order to achieve the purpose of reducing the continuous operation time, reducing the heat radiation area, and reducing the heating time, the heat shrinkage process of the shrinkage sleeve is split into two different heat shrinkage process stages, namely the pre-shrinkage process stage of the shrinkage sleeve and the final shrinkage process stage of the shrinkage sleeve after being sleeved on the cable. Second, in order to achieve the purpose of good appearance forming effect of the shrinkage sleeve, in the final shrinkage process stage of the shrinkage sleeve, the parts protected by the shrinkage sleeve in the cable core are heat shrunk with heat shrinkable tubes RSFR of different specifications as the filling material inside the shrinkage sleeve, so as to achieve the effect that there are no voids or depressions at the formed part of the shrinkage sleeve held by hand, and it is firm and can withstand force. Third, in order to achieve the purpose of improving the qualified rate of cable quality, the temperature settings, operating distances, operating durations and other parameters of the hot air gun are respectively specified in the pre-shrinkage and final shrinkage stages of the shrinkage sleeve.

[0033] A cable assembly with heat shrink forming of a cable tail shrinkage sleeve can be divided into two cases according to the tail form structure: one end is a shrinkage sleeve and both ends are shrinkage sleeves. When one end is a shrinkage sleeve, in order to avoid adverse effects such as the collision of the other end connector and the stress concentration of the welding terminal of the connector, it is necessary to first process the shrinkage sleeve end and then process the other end. When both ends are shrinkage sleeves, it is necessary to first process the shrinkage sleeve end with a complex shape and then process the other end. The connector assembly process with the tail being the shrinkage sleeve end mainly includes processes such as wire pretreatment, wire end treatment, pre-shrinkage treatment of the shrinkage sleeve, welding (crimping), tail shaping treatment, and final shrinkage treatment of the shrinkage sleeve.

[0034] In the production process of the connector with the tail end being a shrinkage sleeve, the operation processes of the pre-shrinkage treatment, tail shaping treatment, and final shrinkage treatment of the shrinkage sleeve are as follows respectively.

[0035] Pre-shrinkage treatment process method of the shrinkage sleeve:

[0036] (1). Put the shrinkage sleeve on one end of a smooth wooden stick, and the diameter of the wooden stick should be less than 1 / 2 of the maximum end diameter of the shrinkage sleeve.

[0037] (2). Set the parameters of the hot air gun as temperature: 300 °C, gear: 3 (air volume: 500 liters / minute).

[0038] (3). Hold the other end of the wooden stick with one hand and the hot air gun with the other hand. Keep the hot air gun outlet about 10 cm away from the shrinkage sleeve, and blow and shrink along the direction from the large end to the small end of the shrinkage sleeve.

[0039] (4) After about 10 minutes, stop heat shrinking. The shrinkage sleeve will shrink to 2 / 3 of its diameter.

[0040] Tail shaping processing method:

[0041] (1) Bind the sleeve (nylon silk sleeve, neoprene hose) sleeved outside the wire at the end of the connector tail accessory and the wire with cotton rope.

[0042] (2) First, put on the heat shrinkable tube. The specifications of the heat shrinkable tube are as follows:

[0043] Length = length of the shrinkage sleeve - length of the tail thread

[0044] Diameter = diameter of the wire outer sleeve × 1.5

[0045] Quantity = 3 - 4 pieces.

[0046] (3) Put the above heat shrinkable tubes on the end face close to the tail accessory in sequence and heat shrink them.

[0047] (4) Second, put on the heat shrinkable tube. The specifications of the heat shrinkable tube are as follows:

[0048] Length = length of the large end of the shrinkage sleeve + 3 - 5 mm

[0049] Diameter = diameter of the wire outer sleeve × 2

[0050] Quantity = 3 - 4 pieces.

[0051] (5) Put the above heat shrinkable tubes on the end face close to the tail accessory in sequence and heat shrink them.

[0052] Final shrinkage processing method of the shrinkage sleeve:

[0053] (1) Put the shrinkage sleeve on the tail accessory. The direction is that the large end of the shrinkage sleeve is sleeved on the thread of the tail accessory.

[0054] (2) Set the parameters of the hot air gun as follows: temperature: 300 °C, gear: 3 (air volume: 500 liters / minute).

[0055] (3) Keep the air outlet of the hot air gun about 10 cm away from the shrinkage sleeve and blow and shrink along the direction from the small end to the large end of the shrinkage sleeve.

[0056] (4) After about 5 - 10 minutes, when the shrinkage sleeve is heat shrunk to tightly wrap the tail accessory and the cable to form a rigid connection, stop heat shrinking.

Claims

1. A process method for heat-shrinking forming of a cable tail shrinkage sleeve, characterized in that: It includes the processes of pre-shrinking treatment of the mold shrinkage sleeve, tail shaping treatment, and final shrinkage treatment of the mold shrinkage sleeve; Process method of pre-shrinking treatment of the mold shrinkage sleeve: (1) Put the mold shrinkage sleeve on one end of a smooth wooden stick. The diameter of the wooden stick should be less than 1 / 2 of the maximum diameter of the mold shrinkage sleeve; (2) Set the parameters of the hot air gun as follows: temperature: 300 °C, air volume: 500 liters / minute; (3) Hold one end of the wooden stick in one hand and the hot air gun in the other hand. Keep the hot air gun outlet 10 ± 2 cm away from the mold shrinkage sleeve and blow and shrink along the direction from the large end to the small end of the mold shrinkage sleeve; (4) After 10 ± 2 minutes, stop heat shrinking. The mold shrinkage sleeve will shrink to 2 / 3 of its diameter; Process method of tail shaping treatment: (1) Bind the sleeve sleeved outside the wire at the end of the connector tail accessory and the wire with cotton rope; (2) First sleeve the heat shrinkable tube. The specifications of the first sleeved heat shrinkable tube are as follows in the equation: Length = length of the mold shrinkage sleeve - length of the tail thread Diameter = outer diameter of the wire sleeve × 1.5 Quantity = 3 - 4 pieces; (3) Sleeve the above heat shrinkable tubes to the end face close to the tail accessory in sequence and heat shrink. The heat shrinkable tubes in this step cover the large end and the small end of the tail accessory, and the heat shrinkable tubes are nested layer by layer; (4) Second sleeve the heat shrinkable tube. The specifications of the second sleeved heat shrinkable tube are as follows in the equation: Length = length of the large end of the mold shrinkage sleeve + 3 - 5 mm Diameter = outer diameter of the wire sleeve × 2 Quantity = 3 - 4 pieces; (5) Sleeve the heat shrinkable tubes in step (4) to the end face close to the tail accessory in sequence and heat shrink. The heat shrinkable tubes in this step are only sleeved on the large end of the tail accessory, and the heat shrinkable tubes are nested layer by layer; Process method of final shrinkage treatment of the mold shrinkage sleeve: (1) Put the mold shrinkage sleeve on the tail accessory already sleeved with the heat shrinkable tube, with the large end of the mold shrinkage sleeve sleeved on the thread of the tail accessory; (2) Set the parameters of the hot air gun as follows: temperature: 300 °C, air volume: 500 liters / minute; (3) Keep the hot air gun outlet 10 ± 2 cm away from the mold shrinkage sleeve and blow and shrink along the direction from the small end to the large end of the mold shrinkage sleeve; (4) After blowing and shrinking for 5 - 10 minutes, when the mold shrinkage sleeve shrinks to tightly wrap the tail accessory and the cable to form a rigid connection, stop heat shrinking.

2. The process method for heat-shrinking forming of a cable tail shrinkage sleeve according to claim 1, characterized in that, In the process method of pre-shrinking treatment of the mold shrinkage sleeve, in step (2), the hot air gun gear is at gear 3; in step (3), the hot air gun outlet is 10 cm away from the mold shrinkage sleeve; in step (4), stop heat shrinking after 10 minutes.

3. The process method for heat-shrinking forming of a cable tail shrinkage sleeve according to claim 1, characterized in that, In the process method of tail shaping treatment, the sleeve sleeved outside the wire in step (1) is a nylon silk sleeve or a neoprene tube.

4. The process method for heat-shrinking forming of a cable tail shrinkage sleeve according to claim 1, characterized in that, In the process method of final shrinkage treatment of the mold shrinkage sleeve, in step (2), the hot air gun gear is at gear 3, and in step (3), the hot air gun outlet is 10 cm away from the mold shrinkage sleeve.

5. The process method for heat-shrinking forming of a cable tail shrinkage sleeve according to any one of claims 1-4, characterized in that, The cable assembly can be divided into two cases according to the tail form structure: one end is a mold shrinkage sleeve and both ends are mold shrinkage sleeves; when one end is a mold shrinkage sleeve, to avoid the bump of the other end connector and the adverse effect of stress concentration of the connector welding terminal, it is necessary to first process the mold shrinkage sleeve end and then process the other end; when both ends are mold shrinkage sleeves, it is necessary to first process the mold shrinkage sleeve end with a complex shape and then process the other end.