塑料件结构设计精讲-推荐
塑料件设计标准
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目录
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1. 柱位结构 ······································································ 3 优缺点及使用范围 ······················································ 4
2. 螺钉沉孔······································································· 5 优缺点及使用范围······················································· 6
3. 带罩盖的螺钉沉孔···························································· 7 罩盖········································································ 8 优缺点及使用范围······················································· 9
4. 金属卡口支撑台（单边卡位） ·············································· 10 双边卡位·································································· 11 金属卡口·································································· 12 优缺点及使用范围······················································· 13
5. 椅背板钢丝卡································································· 14 优缺点及使用范围······················································· 15
6. 钢丝卡·········································································· 16 优缺点及使用范围······················································· 17
7. 平板卡口连接·································································· 18 结构分析·································································· 19 优缺点及使用范围······················································· 20
8. 卡口连接与翻边······························································· 21 结构分析·································································· 22 优缺点及使用范围······················································· 23
9. 插片式卡口连接······························································· 24 结构分析································································· 25 优缺点及使用范围······················································ 26
10. 圣诞树支撑··································································· 27 优缺点及使用范围····················································· 28 圣诞树例样······························································ 29
11. 塑料支脚····································································· 33 优缺点及使用范围······················································ 34
柱位的设计方式-自攻螺钉
自攻螺钉的标准尺寸
自攻螺钉规格 （国标） ST2.2 ST2.9 ST3.5 ST4.2 ST4.8 ST5.5
螺钉柱内径?（mm） 螺钉柱外径（mm）
nd
wd
1.7
5
2.3
6
2.8
7
3.4
7.5
3.8
8
4.4
9
表内值为参考值，一般柱位 内径较nd大0.3~0.4mm，柱 位壁厚在1.25mm左右，以 防止产品表面缩凹。
柱位高一般在5～10mm。
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柱位结构的优缺点及适用范围
? 用途：将零部件（开关盒，铰链等）固定到塑料件上。 ? 优点：结构简单，固定牢固。 ? 缺点：产品表面容易缩凹，装配工序较烦。 ? 适用产品：旁侧板等需要固定零部件的塑料件。
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螺钉沉孔
自攻螺钉的标准尺寸
DB_PART_NO
1
2 3 4 5 6
OS_PART_NAME
ST 2.2 ST 2.9 ST 3.5 ST 4.2 ST 4.8 ST 5.5
std K dk I
2.2
1.6
4
6.5
2.9
2.4 5.6 9.5
3.5
2.6
7
9.5
4.2
3.1
8
9.5
4.8
3.7 9.5 13
5.5
4
11
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std为螺钉螺纹处直径； K为螺钉头部厚度； dk为螺钉头部直径； l为螺钉螺纹处长度； t为产品壁厚； ?根据公差要求进行设定。
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螺钉沉孔的优缺点及适用范围
? 用途：用螺丝固定塑料件。 ? 优点：装配简单,可拆卸,定位性好。 ? 缺点：装配位可见，容易粘定模导致产品拉坏。 ? 适用产品：适用于大部分塑料件的非可见区，如设在可见区，必须得
到客户同意。
粘定模对策
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带罩盖的螺钉沉孔
H<1.5D,定模侧壁脱模斜度大于5度。 此标准件为装配件，装配后盖子与本体 要求无间隙、晃动、断差，且纹理一致。
CATIA 零部件 7
罩盖
CATIA 零部件 8
带罩盖的螺钉沉孔的优缺点及适用范围
? 用途：用螺丝固定塑料件,并遮盖孔位。 ? 优点：装配简单,可拆卸,定位性好，看不到螺钉。 ? 缺点：容易粘定模导致产品拉坏，多一道装配工序，表面有缝隙。 ? 适用产品：适用于大部分塑料件一般要求外观面，使用时必须得到
客户同意。
CATIA 产品 9
金属卡扣支撑台（单边卡位）
CATIA 零部件 10
h=H-6.5(当H<=20时)； h=0(当20
金属卡扣支撑台（双边卡位）
CATIA 零部件 11
单边卡位受法向力时金属 卡扣可能歪斜。 双边卡位受法向力时金属 卡扣可能会拉断塑料件。
金属卡扣
可拆卸式卡扣
不可拆卸式卡扣
CATIA 零部件 12
CATIA 零部件
金属卡扣支撑台的优缺点及使用范围
? 用途：装配CLIP后使塑料件固定在金属板上。 ? 优点：装配简单，可承受法向拉力及压力，高度调节范围大。 ? 缺点：装配后有一定晃动量，对切向受力抵抗弱。 ? 适用产品：旁侧板、前挡板等塑料件，位置较自由。
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椅背板钢丝卡扣
H值一般在20mm左右。
其他规格钢丝可参照此形状适当更改。
CATIA 零部件 14
详细请参照图纸
椅背板钢丝卡扣的优缺点及适用范围
? 用途：用钢丝固定塑料件。 ? 优点：装配简单,可拆卸,位置可适当调节。 ? 缺点：定位差，需靠其他定位机构辅助。 ? 适用产品：椅背板上端，一般于左右上角设2处。
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钢丝卡扣
CATIA 零部件 16
其他规格钢丝可参照此形 状适当更改，开口 尺寸 在钢丝直径的60％左右。
钢丝卡扣的优缺点及适用范围
? 用途：用钢丝固定塑料件。 ? 优点：装配简单,可拆卸,模具上易实现。 ? 缺点：高度有限制,受力有脱落可能。 ? 适用产品：旁侧板、前挡板等塑料件，卡扣周围50mm左右范围内无
发泡或面套挤压。
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平板卡扣连接
CATIA 产品 18
平板卡扣连接－－结构分析
CATIA 零部件 CATIA 零部件 19
平板卡扣连接的优缺点及适用范围
? 用途：平板件与其他塑料件利用卡扣连接。 ? 优点：装配简单且牢固，适用性强。 ? 缺点：需要其他结构支撑板件。 ? 适用产品：适用于板件与一般塑料件的连接等，板件一般不属于重
要外观件。
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