How to identify the wrong type, wrong core and off-core?

(1) Dislocation is the defect that one part of the casting is staggered with another part at the parting surface, which is usually caused by inaccurate positioning of the mold. (2) The core staggering is that the sand cores are staggered at the parting surface, which makes the inner cavity of the casting deform and the outer surface shape of the casting is correct. (3) Core deviation is caused by improper change of sand core position, which results in casting shape and size inconsistent with the

Precision Custom Plastic Metal Steel Turning Aluminium CNC Machining Part

Name: Precision Custom Plastic Metal Steel Turning Aluminium CNC Machining Part
Brand: Qingdao OBT Power Co., Ltd.
SKU: 2039496065

Shandong, ChinaQingdao OBT Power Co., Ltd.

Negotiable

1 Piece

Sample price:US$2.00/piece.Request sample

Product profile

Customization

Available

After-sales Service

24 Times Online

Warranty

2 Years

Model NO.

OBT

Condition

New

Certification

CE, RoHS, GS, ISO9001

Standard

DIN, ASTM, GOST, GB, JIS, ANSI, BS

Customized

Material

Nylon, Steel, Plastic, Brass, Alloy, Copper, Alumi

Transport Package

Wooden Box Packing

Trademark

OBT

Origin

China

HS Code

76169910

Production Capacity

150000

Key features

Multi-Axis CNC Machining: Services include 3-axis, 4-axis, and 5-axis CNC milling and turning capabilities.

Wide Material Selection: Supports Stainless Steel, Carbon Steel, Brass, Aluminum, Titanium, and various Plastics.

High Precision Accuracy: Machining accuracy up to +/-0.005mm with surface roughness Ra0.8.

Comprehensive Certification: Certified with CE, RoHS, GS, and ISO9001:2015 standards.

2-Year Warranty Coverage: Includes 24/7 online after-sales service support for 2 years.

Customized Manufacturing: Fully customizable parts based on customer drawings in DWG, PDF, STEP, etc.

100% Quality Inspection: Strict QC system with 100% inspection before shipment using CMM and testers.

Fast Sample Delivery: Sample lead time of 3-7 working days for rapid prototyping.

Company profile

Importers and ExportersHigh Repeat Buyers ChoiceMulti-language PioneerExperienced Team

Qingdao OBT Power Co., Ltd.

Shandong, China

Business Type: Manufacturer/Factory, Trading CompanyExport Year: 1997-03-08Nearest Port: Qingdao port, Tianjin portAverage Response Time: ≤3.00hTerms of Payment: LC, T/T, D/PInternational Commercial Terms(Incoterms): FOB, EXW, CFR, CIF

AI-Powered supplier vetting

SummaryThe supplier is a limited-company trading company with 15 employees and a valid import/export license. It reports 90% export sales, flexible customization, ODM services, OEM experience for popular brands, in-stock capability, quality assurance, and raw-material traceability. Customer-oriented delivery and after-sales service are claimed, but supporting records are incomplete for corrective actions and complaint handling. The supplier has no available SDK, no new products in the past year, and no overseas agents, branches, warehouses, showrooms, or offline trade-show participation. Manufacturing outsourcing procedures and contracts are not confirmed. Financial information identifies reporting years but provides no substantive financial results, so financial credibility cannot be assessed. Customer reach is described as more than 382 customers, although specific customer cases are not provided.

Supplier typeThe supplier is identified as a limited company and a trading company, with 15 employees, no parent-group affiliation, and a valid import/export license. This supports classification as an independently operated trading supplier rather than a confirmed manufacturer.

CertificationsThe supplier explicitly reports holding a valid import/export license. No other certification information is provided, so the assessment is limited to this documented license.

R&D capabilityThe supplier has no available SDK and reports no new products during the past year, indicating limited documented product-development activity. It does provide ODM services, but this alone does not establish strong internal innovation capability.

Customization capabilityThe supplier explicitly offers flexible customization and ODM services, and also reports OEM service for popular brands. These statements provide direct evidence of customization and externally oriented design-manufacturing support.

Product Q&A

Q:How to prevent the formation of air holes in castings?

The effective methods to prevent bubbles are: reducing the gas content in the metal liquid, increasing the air permeability of sand mold, and adding an air riser at the top of the mold cavity.

Q:How to avoid the situation of sticky sand?

The method to prevent the formation of sand is to add coal powder in molding sand, and to brush the surface of the cast mold with anti-sand paint.

Q:How to identify shrinkage?

(1) Observe the surface shape of casting defects. If the surface is uneven, very rough, and dark gray, the hole with irregular shape is shrinkage cavity. (2) If the location of the hole is at the final solidification thickening of the casting, or at the hot spot where the two walls intersect, and is located in the middle or upper part of the section, it is a shrinkage cavity. (3) The most concentrated hole defects on the thick and large section of steel castings are shrinkage or air shrinkage.

Q:How to prevent sand expansion?

In order to prevent sand expansion, the strength of sand mold and the rigidity of sand box should be increased, and the pressing force or fastening force when closing the box should be increased. In addition, the pouring temperature should be reduced to make the surface of molten metal crust earlier, so as to reduce the pressure of molten metal on the mold.

Q:How to prevent sand inclusion?

Sand inclusion is a kind of groove and scar defect formed on the surface of castings, which is very easy to produce in wet mold casting of heavy plate castings. Avoiding large plane structure can effectively prevent sand inclusion.