{"id":6771,"date":"2026-11-09T09:37:21","date_gmt":"2026-11-09T01:37:21","guid":{"rendered":"https:\/\/miharmle-cnc.com\/?p=6771"},"modified":"2026-11-09T09:37:21","modified_gmt":"2026-11-09T01:37:21","slug":"testowa-praca-trzywalcowej-gietarki-do-blach","status":"publish","type":"post","link":"https:\/\/miharmle-cnc.com\/pl\/blog\/three-roll-plate-bending-machine-trial\/","title":{"rendered":"Testowanie 3-walcowej gi\u0119tarki do blach i kontrola cylindr\u00f3w"},"content":{"rendered":"

When using a 3 roll plate bending machine<\/strong><\/a> to roll a steel plate into a cylinder, it is necessary to ensure the target diameter and consistent roundness.<\/p>\n

Quick Answer<\/strong><\/h2>\n

A 3-roll plate bending machine trial verifies whether the machine can form cylinders to your required dimensions. You should record material specifications, rolling passes, diameter measurements, and roundness results. These checks help you evaluate machine performance before factory acceptance.<\/p>\n

\"3<\/p>\n

I. Why Perform a Trial Rolling Process on a Three-Roller Plate Bending Machine?<\/strong><\/h2>\n

The rated processing capacity of a plate bending machine may not necessarily align with the specific dimensions of the cylinders you intend to produce. Conducting a standardized trial run helps address the following three questions:<\/p>\n

1. Can the equipment roll the material to the required diameter?
\n2. How many operational passes are needed to complete the rolling process?
\n3. Do the dimensions and roundness of the finished cylinder meet the specifications outlined in the drawings?<\/p>\n

II.Recording Plate Specifications and Target Dimensions<\/strong><\/h2>\n

Record the data from every trial run on the plate rolling machine. Before operation, verify the material grade, thickness, width, and cut length of the plate, as well as the target diameter of the cylinder.
\nThe following parameters must be recorded (in mm):<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nTrial Data<\/th>\n<\/tr>\n
Machine model<\/td>\n[Insert model]<\/td>\n<\/tr>\n
Material grade<\/td>\n[Insert grade]<\/td>\n<\/tr>\n
Nominal plate thickness<\/td>\n[Insert mm]<\/td>\n<\/tr>\n
Actual measured thickness<\/td>\n[Insert mm]<\/td>\n<\/tr>\n
Plate width<\/td>\n[Insert mm]<\/td>\n<\/tr>\n
Blank length<\/td>\n[Insert mm]<\/td>\n<\/tr>\n
Target cylinder diameter<\/td>\n[Insert mm, ID or OD]<\/td>\n<\/tr>\n
Required diameter tolerance<\/td>\n[Insert mm]<\/td>\n<\/tr>\n
Required roundness tolerance<\/td>\n[Insert mm]<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The importance of the material grade is as follows:<\/strong>
\n1. Higher yield strength requires greater forming force.
\n2. Plate width also affects the equipment’s actual rolling capacity.
\n3. Consider the plate strength, width, and minimum rolling diameter collectively.<\/p>\n

III. Preparation for Rolling<\/strong><\/h2>\n

1. Inspect the three rollers for any visible signs of wear or contamination.
\n2. Check the equipment\u2019s lubrication, hydraulic, and control systems, as well as its safety protection devices.
\n3. Measure the thickness of the plate at multiple locations.
\n4. Inspect the edges of the plate for burrs or deformation.
\n5. Position the plate and verify the correct feed direction.
\n6. Confirm that the current material, target diameter, and plate width fall within the equipment\u2019s specified processing range.<\/p>\n

Ensure that the plate does not skew during feeding; this is essential for maintaining a consistent diameter at both ends of the rolled cylinder.<\/p>\n

\"Steel<\/p>\n

IV. Plate Pre-bending: Reducing Straight Edges at the Ends of a Cylinder<\/strong><\/h2>\n

Plate pre-bending is a critical step; the specific pre-bending method should be determined based on the actual structure. Its purposes are as follows:
\n1. It effectively reduces the length of the straight, unrolled segments that inevitably remain at the leading and trailing ends of the plate.
\n2. Inadequate pre-bending can increase the workload for subsequent fit-up, welding, and correction processes.
\nThe following data should be recorded regarding the pre-bending process:
\nPre-bending method used for the leading edge of the plate
\nPre-bending method used for the trailing edge of the plate
\nLength of the remaining straight edge after pre-bending
\nWhether any significant deformation has occurred along the edges of the plate<\/p>\n

V. Documentation of Each Forming Stage<\/strong><\/h2>\n

The cylinder rolling process must be determined based on the plate thickness, material strength, and target diameter; a well-planned rolling procedure helps minimize unnecessary risks.
\nCylinder Rolling Pass Record Table:<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n
Stage<\/th>\nOperation<\/th>\nInspection<\/th>\n<\/tr>\n
Preparation<\/td>\nPlate alignment<\/td>\nConfirm feeding position<\/td>\n<\/tr>\n
Pre-bending<\/td>\nForm plate edges<\/td>\nCheck straight ends<\/td>\n<\/tr>\n
Pass 1<\/td>\nInitial cylinder forming<\/td>\nInspect curvature<\/td>\n<\/tr>\n
Pass 2<\/td>\nIncrease curvature<\/td>\nCheck diameter<\/td>\n<\/tr>\n
Pass 3<\/td>\nCorrect remaining deviation<\/td>\nCheck profile<\/td>\n<\/tr>\n
Final pass<\/td>\nCalibration if required<\/td>\nVerify dimensions<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Note: The above serves as an example of a process workflow. The actual number of passes and equipment adjustment parameters should be based on the records obtained during on-site trial rolling.<\/p>\n

VI. How to determine whether the dimensions of a cylinder are within specifications?<\/strong><\/h2>\n

1. Clarify whether the drawing specifies the inner diameter or the outer diameter of the cylinder.
\nOuter diameter = Inner diameter + 2 \u00d7 wall thickness of the material.<\/p>\n

It is recommended to select multiple inspection points along the length of the cylinder, use appropriate measuring tools, and take measurements in different directions at each cross-section.<\/p>\n

VII. How to Determine if a Cylinder Has Undergone Elliptical Deformation<\/strong><\/h2>\n

Diameter checks and roundness checks should be performed separately; for any given cross-section, the diameter can be measured across multiple orientations.
\nDiameter Range = Maximum Measured Diameter \u2212 Minimum Measured Diameter
\nExample of Cylinder Diameter Inspection<\/p>\n

Maximum Diameter: 1502 mm<\/p>\n

Minimum Diameter: 1498 mm<\/p>\n

Diameter Range = 1502 \u2212 1498 = 4 mm<\/p>\n

Note: The data above is provided solely to illustrate the calculation method.<\/p>\n

VIII. Inspecting Straight Edges, Seam Gaps, and Surface Quality<\/strong><\/h2>\n

1. Inspect the residual straight edges at both ends of the plate, as well as the alignment at the cylinder\u2019s seam (joint).<\/p>\n

2. Additionally, the surface of the cylinder should be inspected for the following issues:<\/p>\n