A certain automotive parts enterprise

Release Time：2026-09-04

Case name: Hot melt drilling technology alternative welding solution for door hinge nut plate of a certain automotive parts enterprise

Customer name: A certain automotive parts manufacturing enterprise

Industry: Automotive parts manufacturing

Enterprise scale/background: Domestic passenger car door hinge and body structural component supplier

Project background/customer pain point:

Pain point 1: The door hinge nut plate adopts the traditional "drilling+welding nut" process, and the welding heat affected zone causes deformation of the thin plate. Subsequent need to add straightening process

Pain point 2: Welding nuts involves multiple and time-consuming processes, requiring multiple steps such as drilling, welding, polishing, and straightening for a single piece, resulting in a high overall cost

Pain point 3: Welding high temperature causes the nut threaded hole to shrink and deform, making it difficult for the bolt to align with the hole during assembly, affecting the overall assembly cycle of the vehicle. Solution: The core product/service used by

is Ruiyi RUIYI hot melt drill (flat mouth type) and extrusion tap. Overview: A hot melt drill is used to form a hole and liner on the door hinge nut plate in one go, with a liner thickness of 3-5 times that of the original plate. The liner is directly tapped with an extrusion tap, replacing the traditional drilling+welding nut process.

Implementation effect:

Effect 1: The process has been reduced from the original 5 to 2, eliminating welding, polishing, and straightening processes

Effect 2: The thread strength has been improved compared to welded nuts through tensile and torque tests

Effect 3: The single piece processing time has been significantly reduced, and with the help of automated production lines, the cycle time is stable

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FAQ

How much cost can the hot melt drilling solution in this case reduce due to our large batch size and cost sensitivity? How long is the investment return cycle approximately?

In the case of metal furniture, hot melt drilling replaces the welding nut process, saving welding, polishing processes and nut procurement costs. Long term large-scale production can significantly reduce overall costs. The specific cost reduction varies depending on the workpiece specifications, batch size, and existing processes. Huayi Tools can provide selection suggestions and sample support to help you evaluate investment returns. Suggest contacting the technical team to provide specific working conditions for calculation.

How to ensure the sealing of the battery pack aluminum alloy frame beam using hot melt drilling scheme? Can the connection method in the case pass the airtightness test?

In the case of new energy batteries, a hot-melt drill is integrated on the frame beam wall to form a through-hole convex platform, and a sealing gasket is fitted on the convex platform. After tightening the bolts, a sealed connection is formed. The sealing performance depends on the quality of the protrusion molding, the selection of the sealing gasket, and the tightening torque. The solution in the case has already met the sealing requirements of the battery pack. The specific airtightness testing standards need to be determined according to your product requirements. It is recommended to contact the technical team to provide sample verification.

Do medical device stainless steel thin-walled fittings require no burrs or contamination? Do they need additional cleaning or surface treatment after hot melt drilling?

The chip free processing of hot melt drills does not produce chips, and the hole wall is smooth without burrs, which can reduce subsequent cleaning processes. The medical equipment and fittings in the case meet the surface quality requirements directly after processing, without the need for additional deburring. If the product has special requirements for cleanliness, special hot melt paste can be used in conjunction with it and cleaning standards can be followed. Please consult the technical team for details.

The connection of rail transit vehicles has high requirements for fatigue life. In the case, it was mentioned that "passing fatigue testing". Can specific testing standards or data be provided?

The connection strength test in rail transit cases refers to industry standard fatigue testing methods, such as the requirements of the EN 15085 welding certification system. The specific testing standards and data need to be determined according to your project requirements. Huayi Tools can provide samples and testing support. It is recommended to contact the technical team for targeted solutions.

Can the solution proposed in this case be applied to existing bench drills or CNC machines when the wall thickness of construction machinery structural components is relatively large (such as 6-12mm)? Do we need to replace the equipment?

Hot melt drills can be adapted to manual bench drills, ordinary drilling machines, milling machines, and CNC machining centers without the need for specialized equipment. When the wall thickness increases, it is necessary to use large-sized hot melt drills and adjust the speed and feed appropriately. In the case, the processing of engineering machinery structural components is completed using existing CNC equipment. For specific selection, please consult the Huayi Tool Technology Team.

Our automotive parts factory requires suppliers to comply with the IATF 16949 system. Can the hot melt drilling solution be used on the production line?

Huayi Tool Ruiyi RUIYI Hot Melt Drill can be used in conjunction with the existing quality system of automotive parts enterprises. The solution in the case has been applied to the processing of thin-walled parts such as car door hinges and battery packs. The adaptability of the mass production line needs to be evaluated based on your pace, equipment, and workpiece conditions. It is recommended to contact the technical team to provide specific working conditions, and we can assist in parameter debugging and sample testing.