Editorial Technical Reference

Automated dishwasher production line: stainless tub assembly, line cycle time and end-of-line safety testing

Dishwasher manufacturing lines · Stainless tub roll-seaming, cycle time and line capacity, stamping dies, and end-of-line earth bond and hipot tests

This page covers the production line that builds dishwashers: stamping and roll-seaming the stainless tub, moving tubs through assembly stations, and running electrical safety tests on every finished appliance. Ask three things first: what cycle time and hourly capacity each section reaches and with what rejection rate, which operations are automated versus manual for your volume and budget, and which routine tests the end-of-line stations perform and with what limits.

Production lines for household dishwashers, including tub forming and assembly sections, assembly conveyors and end-of-line test stations, supplied as integrated turnkey lines. Industrial robots used for assembly, including six-axis, SCARA, delta and collaborative robots, are covered on the Assembly robot page. Commercial warewashing machines and the dishwashers themselves are outside this page.

CNFX editorial research · Sources checked October 12, 2026 · 3 sources

Size the tub line Plan end-of-line testing

Illustration of stainless dishwasher tubs with racks on pallets moving along a conveyor, a yellow industrial robot above the line and a door panel at a station beside glass-guarded cells — Illustration: dishwasher tubs on a pallet conveyor with a robot and guarded stations

Start with your task

Size the tub lineCycle time, capacity and stations. Plan end-of-line testingEarth bond, hipot and function tests.

Size the tub line: cycle time, capacity and stations

Wuxi IDO Technology describes its dishwasher tub assembly line for stainless steel tubs as built around a Model 60 liner seaming machine with top, bottom and middle plates, feeding mechanisms and a post-seaming unloading and transfer device, in four workstations A1–A4. It lists a cycle time of 20 seconds or less for the automated section and each standalone machine, whole-line capacity of at least 160 units per hour, a product rejection rate of 0.5% or less and an air source of 0.5–0.6 MPa. [1]

The stations IDO describes are single-piece conveying of top and bottom plates with profile-matching fixtures on a looping conveyor, which includes an elevated section needing 1.8–2.0 m of clear height beneath it; a pre-assembly station where a robotic arm with three independent clamping systems positions the top, middle and bottom panels; a roll-seaming station where the three panels are joined by roll-hemming in a stationary die, with two servo motors positioning the parts and pneumatic fixtures holding the middle panel; and an unloading station where a third robotic arm on a shared gantry, driven by servo motor and rack and pinion, moves the flanged liner onto a rail-guided trolley. [1]

IDO states that whether each part of the line is automated or manual depends on the client's requirements, cycle time, investment budget and available space. [1] Editorial calculation: a 20 s cycle allows at most 3,600 ÷ 20 = 180 cycles an hour at one station, against the ≥160 units/h IDO gives for the whole line; at 160 units/h, a 0.5% rejection rate is 0.8 tubs an hour, or about 6 in an 8-hour shift of 1,280 tubs.

Give the supplier the tub drawings and material, the models and variants to run, target units per hour and shifts, the operations you want automated, available floor space and height, and your existing presses and conveyors.

Plan end-of-line safety and function testing

Seaward, a test-equipment maker, summarises the routine production-line tests that BS EN 60335-1 recommends in its Annex A: an earth bond test at a current above 10 A from a source below 12 V, with a 0.1 Ω fail limit for products without a supply lead and 0.2 Ω for products fitted with one, and no specified test time (Seaward recommends at least 2 s); a functional or run test; and a dielectric withstand (hipot) test. [3]

For the hipot test Seaward lists minimum voltages of 1,000 V AC for basic insulation and 2,500 V AC for double or reinforced insulation where the operating voltage is above 150 V, 800 V and 2,000 V AC at 150 V or below, and 400 V for Class III appliances, applied for at least 1 s with a 5 mA trip current that can be raised where higher leakage is known; a DC voltage of 1.5 times these values is an alternative. [3]

Editorial note: these values are a test-equipment maker's summary; confirm the limits against the edition of EN 60335-1 or IEC 60335-1 and the national adoption that applies to the market, and add any water-leak or function checks your dishwasher design needs.

Tub stamping dies, tub assembly line and end-of-line test sections

The sections below come from one line builder and one test-equipment maker; IDO describes its projects as customized turnkey solutions. [1]

Section	What the source states	Fix in the order
Tub stamping dies	Dies for tub top, tub bottom, inner door, outer door and tub wrapper. [2]	Part list and press tonnage.
Tub assembly line	≤20 s cycle; ≥160 units/h; ≤0.5% rejection; 0.5–0.6 MPa air. [1]	Capacity and variants.
End-of-line test stations	Earth bond, function and hipot tests per EN 60335-1 Annex A as summarised by Seaward. [3]	Test list and limits.

Conveyors, robots, roll-seaming, dies and test stations along a dishwasher line

Module	Role	Fix in the order
Conveying system	Moves plates and tubs between stations; looping conveyor with fixtures. [1]	Conveyor type and clearance.
Robotic arms and gantry	Pre-assembly clamping and unloading. [1]	Robot count and payload.
Roll-seaming machine	Joins top, middle and bottom panels by roll-hemming. [1]	Seam type and models.
Stamping dies	Form tub and door panels. [2]	Die list.
Test stations	Earth bond, hipot, function. [3]	Tester model and limits.
Utilities	Compressed air 0.5–0.6 MPa. [1]	Air and power.

Units per hour, cycle time, power and changeover the line is quoted against

Field	What it means and published values	Ask the supplier for
Production Rate (units/hour)	≥160 units/h whole tub line. [1]	Rate per section and model.
Cycle Time (seconds)	≤20 s per automated section and standalone machine. [1]	Cycle time per station.
Power Consumption (kW)	Connected load of the line.	Load per section.
System Length (meters)	Line layout; elevated conveyor needs 1.8–2.0 m clearance beneath. [1]	Layout drawing.
Automation Level (%)	Set by requirements, cycle time, budget and space. [1]	Automated stations list.
Changeover Time (minutes)	Model change between tub variants.	Changeover time.
Operating Pressure (MPa)	Air source 0.5–0.6 MPa. [1]	Air consumption.
Operating Temperature (°C)	Plant conditions.	Range.
Relative Humidity (% RH)	Plant conditions.	Range.
Electrical Supply (V AC)	Plant supply.	Voltage and phase.
Control Voltage (V DC)	Control circuits.	Value.
IP Rating	Cabinet and station protection.	Rating.
Noise Level (dB(A))	Seaming and press noise.	Measured level.
Line Weight (t)	Foundations and floor load.	Weight per section.

Send the product, volume and test requirements together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Products: [models; tub size and material; door types]
Volume: [units per hour; shifts]
Automation: [stations to automate]
Plant: [floor space; height; presses; air; power]
Testing: [earth bond; hipot; function; leak]
Schedule: [installation and commissioning]

See manufacturer records Send an enquiry through CNFX

Buyer questions

How fast is an automated dishwasher tub line?

Wuxi IDO lists a cycle time of 20 s or less and whole-line capacity of at least 160 units per hour, with a rejection rate of 0.5% or less. [1]

How are dishwasher tubs joined on the line?

IDO's line joins the top, middle and bottom panels by roll-hemming in a stationary die, with servo positioning and pneumatic fixtures. [1]

Which safety tests run at the end of the line?

Seaward's summary of EN 60335-1 Annex A lists an earth bond test above 10 A, a functional test and a hipot test, e.g. 1,000 V AC for basic insulation above 150 V operating voltage for at least 1 s. [3]

Sources and what still needs a direct check

Sources checked 2026-10-12. Wuxi IDO describes its own line and dies; Seaward, a test-equipment maker, summarises the routine tests of EN 60335-1.

Wuxi IDO Technology — Dishwasher Tub Assembly Line ↗ Maker product page Return to text ↑
Wuxi IDO Technology — Dishwasher Stamping Die ↗ Maker product page Return to text ↑
Seaward — Test to BS EN 60335-1 with household appliance testers ↗ Test-equipment maker guidance Return to text ↑

Still to check yourself

Confirm cycle time and capacity per section and model.
Agree which stations are automated.
Confirm floor space, clearance and air supply.
Fix the end-of-line test list and limits against the applicable standard edition.
Verify the legal supplier and factory.