充电桩外壳换料，桩体和枪壳的要求方向常常相反。这篇讲清两条线为什么要分件选料、耐候复验该看哪几项数据、判定表怎么读，以及换过去要动的工序、试模三轮各验什么。
充电桩外壳换料这件事，去年让一家桩厂在验收上卡了一次。
他们把桩体外壳从那支用了多年的料换到我们这边，理由是原料的交货周期越拉越长。
样品顺利，装了几十台做试运营，一个夏天过去，浅色机壳开始泛黄，光泽也掉了。
客户那边只回了一句："件没裂，就是颜色不对，运营商那边的验收不收。"
他电话里的第二句更值得记："我们做过抗紫外，报告是合格的。"
我先反问他三句话：换的是桩体外壳，还是连枪壳一起换了？耐候走的是氙灯还是紫外灯，累计能量给到多少？阻燃和电痕化是老化之后复测的吗？
他答：桩体；氙灯，能量按老报告的量级；老化后复测没做。
下面这条线，就是他这批外壳的完整经过。
起点是样品外观与常规性能都过，试运营放行；潜伏阶段是第一个夏天的强紫外与高温叠加，表面开始失光；爆发是第二批整机验收时色差超线，运营商不收；结算是回查，颜色这条线的根在配方份额上——增韧和阻燃调上去了，耐候那一份被挤薄了。
外壳换料最后算的账，大多落在三个字上：晒太阳。
一、桩体外壳的工况，六维里四样先落下数字
桩体外壳是典型的户外大件，六条线一条都不能省。
紫外这条排在最前面，因为它是少数几条"越晒越差、且不可逆"的线之一。
行业里常见的做法是按氙灯累计辐照能量折算，把几年到十几年的户外暴露压到几百到上千小时里跑完。
温度这条要按面板温度算，不是按气温算。
夏天正午的金属或深色面板，表面温度比气温高出二三十度是常见的；件内外的温差又会在装配面上加一层应力。
循环这条要单独记：昼夜温差一年三百多次，服役十年就是三千次以上的量级。
沿海场景还要加盐雾这一条，按中性盐雾的小时数定等级，金属件与镀层的压力更明显。
电气这条在桩体上是硬项：阻燃要按最小壁厚报，电痕化要调湿态测，而且都要看老化之后的变化。
其余两条是机械与寿命：跌落主要落在枪壳上，桩体更多是风载与挤压；寿命按十到十五年计，外观件还要加一条免喷涂的色差要求。
六样里，紫外、电痕化和阻燃老化后复测这三项要先定，它们决定后面路线怎么走。
二、三条路线，并列摆开
换料不是挑一支"全能料"，是把三条路的代价摆清楚。
| 路线 | 耐候与外观 | 阻燃与电痕化 | 尺寸与翘曲 | 适合换自哪里 |
|---|
| PA6-GF 耐候体系 | 紫外体系齐，颜色控制相对好做 | 需与阻燃体系一起对 | 大件薄壁翘曲要压 | 原通用增强料、中小机壳 |
| PA66-GF 耐候体系 | 耐温余量高一档，颜色偏黄风险更高 | 阻燃与电痕化兼容面较宽 | 翘曲中等 | 原 PA6 强度不足或温度偏高 |
| 分件方案：骨架 + 面板 | 外观面板可走矿物填充或非增强 | 阻燃按骨架承担 | 翘曲最可控 | 大尺寸、高外观要求的桩体 |
三条没有谁更好，只有哪一条跟你的结构和外观要求兜得住。
一个常见误判是把"加耐候改性"当成刷一层保护。
耐候不是表面的事，它是配方里的一份份额：紫外吸收剂、光稳定剂、抗氧剂都要占位置。
增韧剂和阻燃剂调上去，占的就是这份位置——这一条在外壳件上被放大得最明显。
另一个误判是把桩体和枪壳当成一个件来选。
桩体要刚性、要耐候、要抗翘曲；枪壳要韧性、要低温不碎、还要握持手感。
两个件的偏好方向是反的，用同一支料去扛，通常两边都不落好。
三、换料判据表：这张表决定你复验哪几项
把前面的约束落成能核对的指标。
下表门限是方向性建议，不是验收标准；实际数值要由你的件、你的户外条件和你的实测确定。
| 指标 | 方向性门限 | 验证方法 / 标准 | 换料后常见失效 | 通行解法 | 对应助剂体系 |
|---|
| 氙灯老化色差 | 累计能量后 ΔE 在允许内 | ISO 4892-2 / GB/T 16422.2 | 泛黄、失光 | 补齐耐候体系并复测 | 紫外吸收剂 + 受阻胺光稳定剂 |
| 老化后力学保留 | 按整机规范定保留率 | 老化后拉伸 / 冲击（ISO 527、ISO 179） | 表面粉化后变脆 | 稳定化体系 + 控料温 | 抗氧剂（抑制降解） |
| 低温冲击 | 低温下不断裂 | GB/T 1043 / ISO 179，低温箱 | 冬季跌落碎裂 | 增韧体系 + 结构圆角 | 增韧剂 |
| CTI（湿态） | 按整机档位，调湿态测 | IEC 60112，调湿态 | 老化后掉一档 | 低吸湿基材 + 防积污结构 | —（属材料档位） |
| 阻燃（老化后） | 按最小壁厚报 V-0 | UL94 / IEC 60695-11-10 | 老化后阻燃衰减 | 换阻燃体系并复测 | 无卤阻燃剂 |
| 装配面翘曲 | 平面度在图纸内 | 三坐标 / 装配检具 | 装配缝不均、密封差 | 分件或修模 | —（属结构与工艺） |
| 表面状态 | 浮纤与光泽在色板内 | 目视 + 光泽度 + 色板比对 | 浮纤、流痕 | 提模温、调浇口 | 润滑剂（改善流动） |
怎么读这张表：先看头两行。
色差决定能不能验收，保留率决定能不能用够年限，两者都属于同一条老化线。
这两行过不去，后面的强度数据再漂亮也没有意义。
第三列是给采购和品质的：老化报告要写明累计能量与试片厚度，短时长的报告不能当长期结论用。
四、换料之后四种失效，和它们真正的原因
失效一：一个夏天过去，浅色件泛黄、失光。
根因常有两个：耐候助剂的份额不够，或者加工温度把一部分助剂提前消耗掉了。
我们这边观察到的规律是：同一条配方，增韧和阻燃各调高一点，耐候那一份就容易变薄。
这不是料坏了，是配方份额在做取舍，而耐候这一项在取舍里最容易被牺牲，因为它不会立刻显形。
失效二：表面浮纤、光泽不均。
根因在模温与浇口，不在基材。
模温不够，料流前端的玻纤暴露在表面，光一照就是白花花的纹路；浇口位置不理想，流痕会停在外观面上。
这一类靠工艺窗口解决，换料号解决不了。
失效三：大件薄壁件的装配面翘曲。
根因是玻纤取向带来的收缩各向异性。
一件半米长的机壳，装配面只要偏零点几毫米，门的缝隙就不均匀，密封条也跟着吃力。
纸面上看是个尺寸问题，根子上是流道和取向的问题。
失效四：老化之后电痕化掉一档。
根因是三件事叠在一起：吸潮、表面沉积、电压下的碳化。
表面越粗糙，越容易积污积潮；表面一旦被碳化，泄漏电流就顺着碳化层走，再涨也涨不回来。
这一类要看老化后的湿态数据，出厂那一天的合格值说明不了问题。
五、加工与验证：分件之后，工序要跟着分开
分件选料不是把件拆开就完了，工序也要跟着分。
外观面板这一组，重点是表面状态与色差：模温要稳，料温不要顶到助剂的上限，脱模与取件的手法要干净。
骨架这一组，重点是阻燃与刚性：保压和冷却要控住，翘曲的余量要留在结构上，别全推给材料。
干燥这道工序在两类料上都不能省。
外壳件常用玻纤体系，拆包敞口放几个小时含水率就回升；上机前按水分仪或露点确认，不凭手感。
装配与后处理是第三步。
如果面板和骨架是分别成型再装配的，粘接面或卡扣位的清洁度要控住；分件方案里最常见的投诉，就是装配面的清洁没管好。
验证顺序建议这样排，不要换：
1. 材料级：氙灯累计能量后的色差与保留率、湿态电痕化、薄壁阻燃
2. 工艺窗口：变模温与浇口排布打对比件，看浮纤与翘曲
3. 件级：装配面平面度、跌落与低温冲击（枪壳单独做）
4. 老化后复测：阻燃、电痕化、密封与装配尺寸
5. 整机：装到桩上跑户外暴晒与雨淋，按季节复看外观
为什么顺序不能换？因为外观与电性能都依赖表面状态和吸湿状态；表面没定，老化后的数据只对那一批有效。
六、边界：这几种外壳，换料先收手
这一段可能比前面几段更值钱，因为它帮你在开工前止损。
其一，超大尺寸、要求一次成型、外观又不能有浮纤的桩体。
这三条要求同时压在一种料上，通常只能靠分件或者换成型方式解决，硬换料号是往里填时间。
其二，目标市场包含强紫外与沿海双重条件的项目。
耐候等级和盐雾要求都会往上抬，验证周期跟着变长，报交期前先把这一条算进去。
其三，枪壳要求极低温不碎、又要求高刚性的项目。
这两个方向互相牵制，要靠结构解决刚性，材料用来保韧性。
其四，结构上没法加圆角、也没法分件的薄壁大件。
应力集中点改不掉，换料只是把问题推后。
其五，失效点还没定位的件。
黄了、翘了、还是碎了，先分清是耐候、是取向、还是冲击，三件事的解法完全不同。
把这五条写在前面不是劝退，是省时间。
七、换料风险清单（从原方案换到这边，要动的东西）
| 环节 | 要动什么 | 容易漏的点 |
|---|
| 模具 | 收缩率变了，装配面与卡扣位要复测 | 只换料不修模，门缝不均 |
| 干燥 | 换除湿干燥机，按实测含水率定窗口 | 敞口周转几小时就回潮 |
| 调湿 | 关键配合尺寸按调湿态出图 | 关键配合位按干态放行 |
| 料温 / 模温 | 表面状态与熔接线重定，模温要稳 | 料温顶到助剂上限 |
| 保压 / 脱模 | 薄壁大件的收缩补偿要重排 | 取件手法留下划痕 |
| 色差 | 浅色件比深色件更难对，提前对色板 | 批次之间底色有差 |
| 分件装配 | 面板与骨架的粘接面清洁度 | 装配面沾油污 |
| 验证顺序 | 材料→工艺→件级→老化后复测→整机 | 前一项没过就往下走 |
八、打样试模排程（几轮上机、每轮验什么、留样多久）
我们给桩体外壳换料排的试模，通常分三轮，轮次之间不跳步。
头一轮·小样比对：用你的原模具打三到五模，验流动性、外观、熔接线与浮纤位置，同时确认干燥后含水率。
这一轮不追性能，先把"料能不能在你这套模具里把表面做干净"确认掉。
留样两件，标注批号、干燥参数与模温，至少留到第二轮结束。
第二轮·工艺窗口：固定料，变模温与浇口排布打两组对比件。
验装配面平面度、光泽与色板比对、短射填充。
这一轮输出的参数，就是后面量产的参数；分件方案要在这一轮把面板与骨架的配合定下来。
留样按批次封存，至少留到量产稳定后三个月。
第三轮·老化与整机：按累计能量做氙灯老化，复测色差与力学保留；老化后补一次阻燃与湿态电痕化；再装到桩上跑雨淋与季节复查。
这一轮过了，才建议放量。
留样封存周期覆盖首批量产，便于追因。
九、自产能力位与常见问答
配方里的助剂体系按件的工况配——常规助剂常备现货，特殊型号按需配套；你报工况和牌号，料和助剂一次配齐。
如果这篇要拿去汇报，可以收成四行：
| 项 | 一句话结论 |
|---|
| 换什么 | 桩体外壳与枪壳分开选，先按户外条件定耐候等级 |
| 动什么 | 模温浇口重排、干燥换除湿、分件装配面重新定公差 |
| 验什么 | 氙灯色差与保留率、湿态电痕化、老化后阻燃、低温冲击 |
| 什么时候能放量 | 三轮试模过、老化后复测不衰减、整机季节复查无异常 |
读者常问的三句
问：耐候改性加了，为什么还是黄？要看加进去之后有没有被别的体系挤掉份额，也要看加工温度有没有把它提前消耗掉。
问：桩体的电痕化和阻燃要不要老化后复测？要。这两项都是跟着表面状态走的，出厂合格不等于几年后合格。
问：枪壳能不能跟桩体用同一种料？多数项目不建议。两个件的要求方向相反，同料通常两边都勉强。
先把话讲清楚，再谈价钱。
有些单子我们宁可说"这个件我们的料不合适"，也不硬接。选型错了，便宜也是贵。
开篇那三句追问——问是桩体还是枪壳、问耐候的累计能量、问老化后有没有复测——回到这里也就清楚了：这三样答全，外壳该分件还是合件、换完要复验哪几项，基本就定了。
When changing the material of the charging pile's casing, the requirements for the pile body and the gun casing are often opposite. This article explains why the two parts need to select materials separately, which data points should be checked during weather resistance re-testing, how to read the judgment table, as well as the processes that need to be modified when the materials are changed, and what to check in each of the three rounds of mold testing.
The issue of changing the material of the charging pile enclosure caused a charging pile manufacturer to get held up during acceptance inspection last year.
They switched the pile casing from the material they had been using for many years to ours, citing that the delivery cycle of the raw material was getting longer and longer.
The samples were successful, and dozens of units were installed for trial operation. After one summer, the light-colored casings began to yellow, and the gloss also faded.
The client only replied with one sentence: 'The item isn’t cracked, but the color is wrong, and the carrier won’t accept it.'
The second sentence he said on the phone is even more worth remembering: 'We have done UV resistance tests, and the report is qualified.'
I first asked him three counter-questions: Was it just the pile shell that was replaced, or was the gun shell replaced as well? Did the weathering test use xenon lamps or ultraviolet lamps, and what was the accumulated energy delivered? Were the flame retardancy and electrical tracking retested after aging?
He answered: Pile body; xenon lamp, energy according to the magnitude reported in the old report; retesting after aging was not done.
The line below shows the complete process of this batch of shells.
The starting point is that the sample passes both appearance and conventional performance tests, so it’s released for trial operation; the latent phase is the first summer with strong UV and high temperatures combined, causing the surface to begin to lose gloss; the outbreak happens when the second batch of complete machines is inspected and the color difference exceeds the limit, leading the operators to reject them; the settlement is upon review, finding that the root of the color issue lies in the formulation proportions — the toughening and flame-retardant components were increased, while the portion for weather resistance was squeezed.
In the end, when it comes to changing the outer shell, most of the accounting comes down to three words: sunbathing.
1. The working condition of the pile body shell, first drop the numbers for the four samples in six dimensions
The pile body shell is a typical large outdoor item, and not a single one of the six lines can be omitted.
Ultraviolet is listed first because it is one of the few types that 'get worse the more they are exposed and irreversible.'
A common practice in the industry is to convert the cumulative irradiation energy of xenon lamps, compressing several to more than ten years of outdoor exposure into just a few hundred to over a thousand hours.
The temperature should be calculated based on the panel temperature, not the air temperature.
It is common for metal or dark-colored panels at noon in summer to have surface temperatures twenty to thirty degrees higher than the air temperature; the temperature difference between the inside and outside of the component will add another layer of stress on the assembly surface.
This cycle needs to be recorded separately: the day-night temperature difference occurs more than three hundred times a year, and over ten years of service, it amounts to over three thousand times.
For coastal scenarios, salt spray should also be added, with the level determined by the number of hours of neutral salt spray, and the stress on metal parts and coatings becomes more pronounced.
In terms of electrical aspects, this is a tough requirement for the pile body: flame retardancy must be reported according to the minimum wall thickness, electrical tracking must be measured in a humid state, and both need to consider changes after aging.
The remaining two are mechanics and lifespan: falls mainly impact the gun casing, while the pile body is more affected by wind load and compression; the lifespan is calculated at ten to fifteen years, and for exterior parts there is an additional requirement for color difference without repainting.
Among the six items, ultraviolet, electrical tracking, and flame-retardant aging need to be retested first, as they determine the subsequent course of action.
Two or three routes, placed side by side
Changing materials is not about picking a 'universal material'; it's about clarifying the costs of the three options.
| Route | Weather resistance and appearance | Flame Retardant and Electrical Tracking | Size and Warpage | Where is it suitable to change from? |
|---|
| PA6-GF Weather-Resistant System | The ultraviolet system is complete, and color control is relatively easy to handle. | Needs to be matched with the flame-retardant system | Large thin-walled warping needs to be pressed | Original general-purpose reinforced material, small and medium-sized housings |
| PA66-GF Weather-Resistant System | The temperature tolerance margin is one level higher, and the risk of yellowing is greater. | The compatibility range between flame retardancy and tracking resistance is relatively wide | Moderate warping | Original PA6 lacks sufficient strength or the temperature is too high |
| Component plan: skeleton panel | The exterior panel can be mineral-filled or non-reinforced | Flame retardancy relies on the backbone | Warping is most controllable | Large-sized pile with high appearance requirements |
None of the three is better; it’s just a matter of which one suits your structure and appearance requirements.
A common misjudgment is treating 'weather-resistant modification' as just applying a layer of protection.
Weather resistance is not just a surface matter; it is a part of the formulation: UV absorbers, light stabilizers, and antioxidants all need to have their place.
The toughening agent and flame retardant are added, occupying this position — this is most noticeably amplified on the outer casing parts.
Another misjudgment is treating the pile and the cartridge case as a single piece when selecting.
The pile body must be rigid, weather-resistant, and warp-resistant; the gun shell must be tough, not break in low temperatures, and also have a good grip feel.
The preferred directions of the two parts are opposite, and using the same batch of material to handle them usually results in neither side being good.
3. Material Change Criteria Table: This table determines which items you need to re-inspect
Turn the previous constraints into verifiable indicators.
The thresholds in the table are directional suggestions, not acceptance standards; the actual values need to be determined by your equipment, your outdoor conditions, and your own measurements.
| Indicator | Directional Threshold | Verification Method / Standard | Common failures after material change | Common solution | Corresponding auxiliary agent system |
|---|
| Xenon lamp aging color difference | After accumulating energy, ΔE is within the allowed range | ISO 4892-2 / GB/T 16422.2 | Yellowed, dulled | Complete the weathering system and retest | Ultraviolet Absorber Hindered Amine Light Stabilizer |
| Mechanical retention after aging | Retention rate according to the whole machine specifications | Tensile / Impact after aging (ISO 527, ISO 179) | Becomes brittle after surface powdering | Stabilization system Control material temperature | Antioxidant (inhibits degradation) |
| Low temperature shock | Does not crack at low temperatures | GB/T 1043 / ISO 179, low-temperature chamber | Winter fall and shatter | Toughening System Structural Fillet | Toughening agent |
| CTI (wet state) | Measure in wet condition according to the machine gear | IEC 60112, conditioned state | Drops one gear after aging | Low moisture-absorbing substrate Anti-fouling structure | —(Material grade) |
| Flame retardant (after aging) | Report V-0 according to minimum wall thickness | UL94 / IEC 60695-11-10 | Flame retardancy degradation after aging | Change the flame retardant system and retest | Halogen-free flame retardant |
| Assembly surface warping | Flatness within the drawing | CMM / Assembly Gauge | Uneven assembly seams, poor sealing | Parting or mold repair | —(Structural and Process Attributes) |
| Surface condition | Floating fibers and luster in the color swatch | Visual inspection Glossiness Color swatch comparison | Floating fibers, flow marks | Form removal temperature, gate adjustment | Lubricant (improves flow) |
How to read this table: first look at the first two rows.
Color difference determines whether it can pass inspection, and retention rate determines whether it can last for the intended service life; both belong to the same aging curve.
If these two lines can't pass, no matter how good the subsequent intensity data is, it is meaningless.
The third column is for procurement and quality: the aging report must specify the cumulative energy and the thickness of the test piece; reports of short duration cannot be used as long-term conclusions.
4. Four types of failures after material replacement, and their real causes
Failure 1: After one summer, the light-colored items turn yellow and lose their shine.
There are usually two root causes: insufficient proportion of weathering additives, or part of the additives being consumed prematurely due to processing temperature.
The pattern we observed is: for the same formula, if the toughness and flame retardancy are each increased slightly, the weather resistance part tends to become thinner.
This doesn’t mean the material is bad; it’s about making trade-offs in the formula proportions, and weather resistance is the easiest to sacrifice in these trade-offs because it doesn’t show immediately.
Failure 2: Surface fiber float and uneven gloss.
The root cause lies in the mold temperature and the gate, not in the substrate.
If the mold temperature is insufficient, the glass fibers at the front end of the material flow are exposed on the surface, and under light they form whitish streaks; if the gate position is not ideal, flow marks will remain on the appearance surface.
This type is resolved through process windows and cannot be solved by changing the material number.
Failure 3: Warping of the assembly surface of large thin-walled parts.
The root cause is the shrinkage anisotropy caused by the orientation of the glass fibers.
A half-meter-long machine casing, if the assembly surface is off by just a few tenths of a millimeter, the door gap will be uneven, and the sealing strip will also be strained.
On paper, it seems like a size issue, but at its root, it's a problem with the flow channel and orientation.
Failure Four: After aging, the electric tracking drops by one level.
The root cause is three things piling up together: moisture absorption, surface deposition, and carbonization under voltage.
The rougher the surface, the more easily it accumulates dirt and moisture; once the surface is carbonized, the leakage current flows along the carbonized layer and cannot return even if it rises again.
For this type, we need to look at the wet-state data after aging; the qualified values on the day of manufacture do not indicate the problem.
5. Processing and Verification: After disassembly, the processes should also be separated.
Sorting materials by component is not just about taking the pieces apart; the processes must be divided accordingly.
For this set of exterior panels, the focus is on surface condition and color difference: the mold temperature should be stable, the material temperature should not reach the upper limit of the additives, and the demolding and handling techniques must be clean.
For this set of the framework, the focus is on flame retardancy and rigidity: pressure holding and cooling need to be controlled, and allowances for warping should be incorporated into the structure, not entirely blamed on the material.
The drying process cannot be skipped for either of the two types of materials.
The outer shell parts commonly use glass fiber systems; after unpacking and leaving them exposed for a few hours, their moisture content will rise again. Before processing, confirm the moisture level with a moisture meter or dew point measurement, not by hand feel.
Assembly and post-processing are the third step.
If the panels and the skeleton are molded separately and then assembled, the cleanliness of the bonding surfaces or snap-fit positions must be controlled; the most common complaint with the parting scheme is that the cleanliness of the assembly surfaces was not properly managed.
It is recommended to arrange the verification sequence like this, do not change it:
1. Material level: color difference and retention rate after cumulative energy of xenon lamp, wet electrical tracking, thin-wall flame retardancy
2. Process window: Compare different mold temperatures and gate arrangements to check for floating fibers and warpage.
3. Component Level: Assembly surface flatness, drop and low-temperature impact (handled separately for the cartridge case)
4. Retesting after aging: flame retardancy, tracking resistance, sealing, and assembly dimensions
5. Whole machine: Install on the pile to run outdoors under sun exposure and rain, and inspect the appearance again according to the season
Why can't the order be changed? Because both appearance and electrical performance depend on the surface condition and moisture absorption state; if the surface isn't fixed, the aging data will only be valid for that batch.
6. Boundary: For these types of shells, stop handling the material first when changing it.
This section may be more valuable than the previous few sections because it helps you cut losses before starting work.
First, the pile body is of super-large size, requires one-time forming, and its appearance must not have floating fibers.
These three requirements all pressing on one type of material can usually only be solved by splitting the parts or changing the molding method; forcibly changing the material code is just filling in time.
Secondly, the target market includes projects with both strong ultraviolet exposure and coastal conditions.
The weathering grade and salt spray requirements will both be raised, the verification cycle will be extended accordingly, and this should be taken into account before reporting the delivery date.
Thirdly, the cartridge case requires extremely low-temperature resistance without shattering, and also requires high rigidity.
These two directions constrain each other, requiring structure to solve rigidity, and materials to maintain toughness.
Fourth, thin-walled large parts that cannot have rounded corners or be split into pieces structurally.
The stress concentration point cannot be eliminated; changing the material only postpones the problem.
Fifth, parts whose failure points have not yet been located.
Yellowed, warped, or broken, first distinguish whether it is weather resistance, orientation, or impact; the solutions for these three issues are completely different.
Putting these five points at the front is not to discourage, but to save time.
7. Material Change Risk List (things that need to be changed when switching from the original plan to this one)
| link; segment; part | What do you want to move? | Points that are easy to overlook |
|---|
| Mold | The shrinkage rate has changed, the assembly surface and the snap-fit positions need to be re-measured. | Only replace the material without repairing the mold, the door gaps are uneven |
| Dry | Replace the dehumidifying dryer and set the window according to the measured moisture content. | The exposed surface regains moisture after a few hours. |
| Humidity control | Key fitting dimensions are drawn in the conditioned state | Key mating positions are released according to the dry state |
| Material Temperature / Mold Temperature | Surface condition and weld line relocation, mold temperature must be stable | Material temperature reaches the upper limit of the additive |
| Pressure Holding / Demolding | The shrinkage compensation for large thin-walled parts needs to be rearranged | The pickup method left scratches |
| Color difference | Light-colored parts are harder to match than dark-colored parts, so prepare the color board in advance. | There is a difference in the base color between batches |
| Component assembly | Cleanliness of the bonding surface between the panel and the frame | Assembly surface contaminated with oil |
| Verification order | Material → Process → Component Level → Retest After Aging → Whole Machine | If the previous item fails, just move on. |
8. Sample Mold Trial Schedule (How many rounds of machine use, what to test in each round, how long to retain)
We usually do three rounds of mold trial for the pile shell material change row, with no skipping between rounds.
First round · Small sample comparison: Use your original mold to make three to five molds, check flowability, appearance, weld line and floating fiber position, and confirm moisture content after drying.
This round doesn't focus on performance; first, confirm whether the material can clean the surface in your mold set.
Keep two samples, mark the batch number, drying parameters, and mold temperature, and keep them at least until the end of the second round.
Second round · Process window: fix the material, adjust mold temperature, and make two sets of comparison parts for gate arrangement.
Check the flatness of the assembly surface, gloss and color palette comparison, and short-shot filling.
The parameters output in this round are the parameters for subsequent mass production; The component splitting plan must finalize the fit between the panel and the frame during this round.
Retain samples by batch sealing, at least three months after mass production stabilizes.
Third round · Aging and complete machine: Perform xenon lamp aging according to cumulative energy, retest color difference and mechanical retention; After aging, add one more round of flame retardant and wet electric marking; Then install on the pile to run for rain exposure and seasonal re-inspection.
Only after this round is recommended to ramp up.
Sample retention and sealing cycle covers the first batch of production, making it easier to trace the cause.
9. Self-Production Capacity and FAQs
The additive system in the formula is tailored according to the working conditions of each piece—regular additives are always in stock, special models are matched as needed; You report the working conditions and grade, and the materials and additives are all prepared in one go.
If you want to use this article for a report, you can summarize it in four lines:
| Item | One-sentence conclusion |
|---|
| What to replace | Pile shell and gun shell separately, first set the weather resistance rating based on outdoor conditions |
| What to move | Rearrange mold temperature gates, dry replace with dehumidification, Re-defining tolerances on the assembly surface |
| What to test | Xenon lamp color difference and retention, wet electro-trace formation, flame retardancy after aging, low-temperature shock |
| When will volume increase | Three rounds of mold trials, no degradation after retesting, no abnormalities during seasonal inspection of the whole machine |
Three frequently asked questions by readers
Question: After adding weather-resistant modification, why is it still yellow? You need to see if other systems have squeezed out the share after adding it, and also check if the processing temperature has consumed it in advance.
Question: Should the electric mark formation and flame retardant of the pile body be retested after aging? Yes. Both of these items depend on the surface condition; factory passing does not mean passing the test years later.
Q: Can the gun shell and pile body be made of the same material? Most projects do not recommend it. The requirements for the two parts are opposite; usually both sides are barely made of the same material.
Make your situation clear first, then negotiate the price.
For some orders, we'd rather say "our material isn't suitable for this piece" than take it rigidly. If you choose the wrong model, cheap can be expensive.
The three follow-up questions at the beginning—asking if it's the pile body or the gun shell, the accumulated energy of weathering, and whether it was retested after aging—once you get back to this, it's clear: if all three are answered, should the shell be split or assembled, and which items to re-inspect after replacement, it's basically decided
