Negative pressure fixing jig for a housing workpiece

CN224688470UActive Publication Date: 2026-08-28ANHUI DEBOJIE ELECTROMECHANICAL CO LTD
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Patent Information

Application Number
CN202521933962.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-09
Publication Date
2026-08-28
Estimated Expiration
2035-09-09

AI Technical Summary

Technical Problem

传统机械夹持方式通过卡爪、压板等结构对工件进行物理固定，虽能提供一定的夹持力，但夹持力易导致壳体工件发生局部形变，尤其对于薄壁壳体工件，形变问题更为突出，直接影响后续加工尺寸精度

Benefits of technology

[0011]本实用新型的有益效果：本实用新型通过设置与壳体工件适配的定位模型，将壳体工件扣在定位模型上，不仅壳体工件定位精准，还利用抽气装置抽气使气槽和壳体内形成均匀负压，能稳定地将壳体工件吸附在定位模型上，也避免了常规夹具夹持带来的变形问题。同时，所述气槽纵横交错，形成网格状结构，能在定位模型上端面更广泛地分布，从而使壳体工件受到的负压均匀；且在定位模型上设置一组均匀分布的第一抽气孔，进一步保证了壳体工件受到的负压均匀，提升负压吸附效果。同时，将气槽的宽度和第一抽气孔的直径设计成均小于铣刀直径，当铣刀作用在壳体工件上时，壳体工件下方均能得到定位模型的支撑，可有效防止壳体工件在加工过程中变形。此外，定位模型上端设置的密封槽及内部的密封圈，增强了定位模型与壳体工件之间的密封性，保证了负压的稳定产生；密封圈采用硅胶材料制成，具有较好的密封性、耐温性和耐磨性，能够长期保证定位模型与壳体工件之间的密封效果。

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Abstract

The utility model discloses a kind of negative pressure fixing jigs of shell workpiece, including base, the positioning die core being set on base and being adapted with shell workpiece inner cavity, the upper end surface of the positioning die core is provided with a group of intercommunication gas groove, first suction hole is provided on the positioning die core and is communicated with gas groove, second suction hole is provided on the base and is communicated with first suction hole, the other end of second suction hole is connected and provided with vacuumizing device.The utility model is fixed to shell workpiece stable and reliable, and will not cause deformation to shell workpiece, can be widely applied in shell workpiece processing technical field.
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Claims

1. A negative pressure fixing fixture for a shell workpiece, characterized in that: Includes a base (1), a positioning mold core (2) set on the base (1) and adapted to the inner cavity of the shell workpiece, the upper end face of the positioning mold core (2) is provided with a set of interconnected air grooves (21), the positioning mold core (2) is provided with a first air extraction hole (22) communicating with the air grooves (21), the base (1) is provided with a second air extraction hole (11) communicating with the first air extraction hole (22), and the other end of the second air extraction hole (11) is connected to a vacuum device (3).

2. The negative pressure fixing fixture for the shell workpiece according to claim 1, characterized in that: The upper end face of the positioning mold core (2) is provided with a sealing ring fixing groove (23), and a sealing ring (4) is provided in the sealing ring fixing groove (23), and the sealing ring (4) is higher than the upper end face of the positioning mold core (2).

3. The negative pressure fixing fixture for the shell workpiece according to claim 1, characterized in that: The air groove (21) includes a transverse air groove (211) and a longitudinal air groove (212), which are interwoven to form a grid.

4. The negative pressure fixing fixture for the shell workpiece according to claim 1, characterized in that: The positioning mold core (2) is uniformly provided with a set of first air extraction holes (22) that communicate with the air groove (21), and the base (1) is provided with a set of second air extraction holes (11) that communicate with each of the first air extraction holes (22).

5. The negative pressure fixing fixture for the shell workpiece according to claim 4, characterized in that: The second air extraction hole (11) includes a second vertical air extraction hole (111) that penetrates the base (1). One end of the second vertical air extraction hole (111) is connected to the first air extraction hole (22), and the other end is provided with a plug (5). The base (1) is also provided with a second horizontal air extraction hole (112) that communicates with the second vertical air extraction hole (111).

6. The negative pressure fixing fixture for the shell workpiece according to claim 1, characterized in that: The width of the air groove (21) and the diameter of the first air extraction hole (22) are both smaller than the diameter of the milling cutter.

7. The negative pressure fixing fixture for the shell workpiece according to claim 2, characterized in that: The sealing ring (4) is made of silicone.