Cable Assembly

LHD Mission

We are very keen on the needs of our customers.

LHD Purpose

To provide clients with a truly one-stop shopping experience.

LHD Specialties

To achieve excellent PCBA function.

Crimping Process

Each process has inputs and outputs, i.e. relevant documents need to be compiled to guide the production of the corresponding process, such as the wire down table to guide the wire down crimping process.

Note: the wire down table that is, the wire down, crimping details, including a variety of process parameters and requirements, such as process forms. In the wire harness production process, the down wire table ultimately through the down wire crimping process card, used to guide the operation of the down wire crimping process, to guide the workshop production process.

Each process also needs to be inspected, and only after the inspection is passed can the batch be carried out, and the process needs to be monitored at any time. For example, in the next line process, you need to make the first piece, the first piece of wire length, stripping head and other parameters through the inspection, before the batch off the line.

Downstream (material) process


The so-called underline is according to the design drawings, the different specifications of the wire conductor according to the process documents for cutting, stripping, bundling process.


prepare materials → adjust equipment → first piece of inspection (measuring wire length, stripping head) → mass production (in the final inspection, 100% self-inspection) → finishing wire → to be turned over.


The wire length, full stripping and half stripping length, opening length and other process parameters need to be measured in the downstream process.

Crimping Process

Definition: The so-called crimping is the process of acting the wire and terminal together.

Process: ready materials → adjust the equipment → do the first piece → the first piece of inspection (micrometer to measure the height of the crimp, crimp width) → mass production (in the end of the inspection 100% self-check crimp quality) → to be turnover

Inspection: The crimping process needs to measure whether there is R angle, whether the visible range of core wire and insulation skin is within the tolerance range, whether there is any damage to the pressing part of the core wire and insulation skin, and whether there is any damage to the pressing part of the core wire and insulation skin, as well as the crimping distortion degree and other process parameters.

Each process

Cable Assembly

In PCBA processing, not only is there only component placement, but there are also often a lot of circuit boards that need to be soldered with a large number of wiring harnesses. Generally this harness is used in the DIP insertion process, which is different from other parts of SMT processing, as it needs to be manually inserted into the through-hole and then coated with solder paste through wave soldering.

In the production of PCBA, the wire harness plays an important role in connecting various components and parts. A wire harness is an assembly of multiple insulated wires or optical fibers used to transmit electrical signals, power or data. In PCBA production, wire harnesses assume the following roles:


Feeding Wire

Wire feeding equipment: the required processing wire to the transit feeder frame.

Required equipment: wire feed frame, wire feeder.

Requirements: Pay attention not to scratch the surface of the wire. Avoid multiple wire processing at the same time, the wire tension is not the same.



Cutting:To get the required length, we need to use the wire cutting machine
equipment: computer wire cutting machine, multi-functional cutting line, cutting line stripping machine.
Process: To make sure that the wire is up to standard, we have some standards in the production process. It is not allowed to cut the surface of the wire; not allowed to cut the copper wire; it is not allowed to strip the length of the wire with an error of more than ±1mm.



Wire stripping: according to the SOP requirements strip the length of the wire at the connector corresponding to the insulation.
Equipment: Machine for wire cutting, vertical stripping, and pneumatic stripping
Process requirements: no surface crush; peeling length error is not allowed to exceed ± 1mm.


Twisting line

Twisted wire: finishing and twisting the conductor at the joint.
Required equipment: cutting line stripping and twisting machine, cutting line twisting machine.
Craft requirements: not allowed to scratch the surface of the wire; copper wire must be twisted tightly, and not allowed to appear loose wire.

Equipment: The equipment required for Step 4 is the same as the Step 3
Process requirements: no surface crush; peeling length error is not allowed to exceed ± 1mm.


Crimp Terminal

Rivet terminals: riveted joints at the conductor and plug terminals.

Required equipment: terminal machine, single and double head terminal machine, automatic terminal machine, copper tape machine, mute terminal machine.

Process requirements: the terminal is not deformed and must meet the requirements of tension, riveting height, width.


Dip Tin

Dip tin: tin on the joints to facilitate the insertion of circuit boards.

Required equipment: automatic tin machine, single and double head tin machine, cutting line tin machine.

Process requirements: tin evenly, not allowed to not appear loose wire, tin depth in line with the requirements.



assembling plastic plug shell.

Required equipment: electric screwdriver.

Requirements: screws are not allowed to expose the surface of the plastic shell; must meet the product requirements of the torque.


Conduction Test

the use of instruments for wire harness conduction test.

Required equipment: conductivity tester.

Requirements: no short circuit, broken circuit, miswiring, poor contact, poor insulation and other phenomena.



use plastic bags to encapsulate the finished wire harness and put it into carton.

Required equipment: sealing machine and baler.

Requirements: sealing should be flat; packing tape should be tightly wrapped carton, not allowed to fall off.

Pre-assembly (Pre-Assembly) Process


The so-called pre-assembly is the process of assembling the semi-finished products with sheaths, tubes, rubber parts and other components into new semi-finished products after wire or crimping.


Prepare all the materials → one insertion, two listening, three pull back → installation of self-locking


According to a plug two listen to three back to pull the process to complete the self-inspection.

Assembly (Total Assembly) Process

The so-called assembly is the process of combining the semi-finished products after wiring or crimping, semi-finished products after pre-assembly and other materials into a finished wire harness. Tape or zip ties are bundled into bundles, which are wire harnesses.

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