Office Chair Backrest Mold Structure Diagram

Currently, there is no directly publicly available complete resource for the office chair backrest mold structure diagram, but relevant information or design references can be obtained through the following methods:

I. Analysis of Existing Drawing Resources

According to public information, Mufeng Network Drawing ID 1870619 provides a set of precision plastic mold design drawings with the following core parameters:

• Application Scenario: Used for producing chair backrest panels. The mold cavity surface supports fine-line or high-gloss treatments to meet different aesthetic requirements.
• Technical Features: Optimized cooling system design ensures rapid molding of the backrest without deformation through runner layout and cooling waterway planning. The product support structure is stable, and the installation hole positions are highly accurate, allowing for a firm connection with the chair seat.
• File Format: A prt file in UG NX10.0 format, which requires the corresponding software version to open. A download fee of 25 Mufeng coins is required.

This drawing is a verified and mature design solution, suitable for direct reference or secondary development, but attention should be paid to copyright and payment restrictions.

II. Self-Design Methods

If you need to obtain the mold structure for free, you can refer to the SolidWorks 2026 tutorial on modeling a stainless steel backrest chair and complete the design through the following steps:

1. Sketch Drawing: Draw the basic outline in a 3D software according to the backrest dimensions and surface requirements, and mark key dimensions (such as height, curvature, and installation hole positions).
2. Parting Surface Design: Divide the backrest model into a moving mold and a fixed mold according to the plastic mold parting principle to ensure smooth demolding without flash.
3. Cooling System Planning: Arrange cooling waterways in the moving and fixed molds, prioritizing conformal waterways to improve cooling efficiency. The waterway diameter is usually 8-12mm, and the spacing is controlled within 30-50mm.
4. Ejection Mechanism Design: Select ejector pins or slanted ejectors according to the backrest structure. The ejection position should avoid reinforcing ribs and installation holes to prevent product deformation.
5. Mold Flow Analysis Verification: Use software such as Moldflow to simulate the filling process, optimize the gate position and runner size, and ensure uniform filling of the melt without shrinkage marks.

III. Key Design Points

• Material Selection: For the mold core and cavity, H13 or NAK80 mold steel is preferred, with a hardness of HRC48-52 to withstand long-term high-pressure injection.
• Surface Treatment: The cavity surface can undergo nitriding or PVD coating treatment to improve wear resistance and demolding properties. For fine-line treatment, the surface roughness Ra should be controlled at ≤0.8μm.
• Exhaust System: Set up exhaust slots on the parting surface and at the end of the core, with a width of 0.03-0.05mm and a depth of 0.008-0.015mm, to avoid air entrapment and burning.

If further design optimization is required, it is recommended to adjust the mold structure according to specific product requirements (such as production volume, cost, and material) or contact a professional mold manufacturer for custom development.