Baoding Longway Trading Co., Ltd.

Baoding Longway Trading Co., Ltd. ISO 9001 foundry, OEM, export sand casting, investment casting,forging, machining parts with heat treatment and surface treatment since 2014.

How do you choose the right CNC machining solution without increasing your manufacturing cost?The answer depends on much...
10/07/2026

How do you choose the right CNC machining solution without increasing your manufacturing cost?
The answer depends on much more than machining accuracy. Material selection, production volume, lead time, and machining capability all play an important role.
In our latest article, we share practical insights on CNC machining materials, applications, low-volume production, and 5-axis machining to help OEM buyers make informed sourcing decisions.
📖 Read the full article here: https://www.bdlongway.com/how-to-choose-the-right-cnc-machining-service-for-custom-metal-parts/
Have a custom machining project? Send us your drawings—we're happy to review them and recommend the most suitable manufacturing solution.
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com

Sometimes, what really affects the quality of castings is not the melting temperature, but some manufacturing details th...
09/07/2026

Sometimes, what really affects the quality of castings is not the melting temperature, but some manufacturing details that are easily overlooked.
As a trade and industry integration enterprise with nearly 20 years of experience, our quality control is implemented throughout the entire product production process.
Raw material control: According to customer requirements, confirm the material, check the material certificate and chemical composition.
Manufacturing process control: for example，resin sand mold casting. Due to the influence of environmental temperature and air humidity on the state of the sand mold, some projects will adopt hot air assisted drying and other measures to reduce the residual moisture in the mold cavity and create more stable conditions for subsequent pouring.
Process dimension control: the key dimensions of agricultural machinery parts,construction machinery parts, mining engineer equipment parts and power transimission system parts ,the hole of fire protection piping fitting,pumps and valves components and water treatment industries components, coaxiality, flatness and other important characteristics of the product, the remanufacturing process to carry out phased detection, timely find and correct deviations.
Finally, before shipment, according to the customer's drawing requirements, the size, appearance and related performance are finally confirmed to ensure that the product meets the assembly and use requirements.
As a supplier of one-stop manufacturing services for sand casting, investment casting, forging, and CNC machining, Longway always pays attention not only to the final product, but also to the stability of the entire manufacturing process.
Because for OEM projects, stable process control is often more important than one-time high quality.
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com




For power transmission parts such as drive shafts and stepped shafts, the final forged part is not produced by a single...
08/07/2026

For power transmission parts such as drive shafts and stepped shafts, the final forged part is not produced by a single process from the forging blank. The material organization, concentricity, dimension tolerance, heat treatment quality, and surface processing accuracy of shaft parts are directly related to the stability of equipment operation. High-temperature forging and melting of steel, precise control of tolerances, perfect integration of thermal process and precision craftsmanship.
The truly reliable shaft parts are not only machined, but also controlled stably in every manufacturing process. The precision of every fitting surface has been repeatedly polished and calibrated through multiple processes. Our unique competitiveness comes from our extreme pursuit of precise dimensions and our unwavering commitment to high-end quality.
We can provide stable and reliable metal forgings like transmission core parts for mining equipment parts, agricultural machinery parts, pumps valves parts, engineering equipment parts according to drawings and application requirements. Every shaft has gone through investment casting or sand casting or forging and then cnc machining, rigorous inspection, and comprehensive process protection over time.
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com

In mechanical transmission, there are many connection methods between the shaft and the hub, such as key connection, pin...
07/07/2026

In mechanical transmission, there are many connection methods between the shaft and the hub, such as key connection, pin connection and splined connection.
Among them, involute splines have become one of the most common forms of transmission in agricultural machinery components, engineering machinery components, gear reducers components, hydraulic systems components and other equipment. According to the product structure and use requirements, a splined shaft will usually go through several key manufacturing processes: forging, CNC turning, splined machining, heat treatment, and cnc grinding. Every process affects the performance of the final product. If any link is not controlled properly, it may lead to abnormal assembly clearance, accelerated wear of splines, and even affect the stable operation of the entire transmission system.
The reason is not that it is more complex in structure, but that it can transfer the load more evenly. Compared with the connection of the ordinary key, the involute splined connection involves the force of multiple teeth at the same time, which makes the torque distribution more uniform, effectively reduces the local stress concentration, and improves the stability and service life of the connection.
Therefore, it usually has the following advantages: carrying a greater torque; Maintain better coaxiality; Improve wear resistance and fatigue resistance; It is convenient to assemble and easier to maintain in the future.
This is why it is widely used in: agricultural machinery drive shafts components , engineering machinery drive systems parts, gearbox input and output shafts components, hydraulic transmission components, and various types of power transmission equipment parts.
Of course, a reliable splined connection system components depend not only on the tooth design.
The machining accuracy of splines, the quality of heat treatment, and the dimensional control between splines and mating parts all determine the final transmission performance and service life.
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com





Why must some holes be bored rather than drilled directly?Many people think that it is only necessary to drill a hole to...
06/07/2026

Why must some holes be bored rather than drilled directly?
Many people think that it is only necessary to drill a hole to process it.
But in precision CNC machining, CNC drilling is often just the first step.
The main function of drilling is to quickly form a hole, and when the part has higher requirements for hole diameter accuracy, roundness, concentricity, or the position relationship with other holes, it needs to be machined by boring.
Typical examples are fl**ge bores, drive shaft holes, gear inner bores, bearing seat mounting holes, gearbox casing bearing bores, and matching holes on pump and valve bodies.
These holes are not just through holes, but also play an important role in positioning, supporting and matching.
If the size deviation of the hole is too large, the roundness is insufficient, or the coaxiality is unstable, it may lead to difficulties in the installation of the bearing, a decrease in the sealing performance, and even affect the operation of the whole machine.
Compared with direct CNC drilling, CNC boring can further improve: the accuracy of hole diameter; Roundness and concentricity; The quality of the inner hole surface; The stability of the fit between the shaft, shaft sleeve, or bearing.
Therefore, in many castings parts and forging parts, we usually reserve reasonable machining allowance, drilling is responsible for "drilling holes", and boring is responsible for "ensuring precision".
Longway not only provides one-stop manufacturing services for investment casting parts, sand casting parts, forging parts, and CNC machining parts, but also pays attention to the connection and stability between each process, helping customers obtain mechanical parts with consistent dimensions and reliable assembly.
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com

**ge

03/07/2026

Machining Insights
When Is Milling the Better Choice Than Turning?
When discussing CNC machining, cnc turning and cnc milling are often mentioned together.
But they are designed for very different types of features.
Turning is ideal for rotational parts such as shafts, bushings and sleeves, where the workpiece rotates around its center axis.
Milling, on the other hand, becomes the preferred process when a part requires features that cannot be created by rotation alone.
For example: flat mounting surface, keyway and slot, cavity and groove, array of bolt holes, complex 2D and 3D contours.
These features are commonly found in gearbox housings, bearing supports, valve bodies, fl**ges, and automation components.
Choosing milling at the right stage of production can also improve overall manufacturing efficiency. A casting or forging that is designed with appropriate machining allowances allows the milling process to focus on precision rather than removing unnecessary material.
At Baoding Longway, we provide integrated manufacturing solutions including investment casting, sand casting, forging and CNC machining. By selecting the most suitable manufacturing route from the beginning, we help customers improve machining efficiency while maintaining consistent quality.
The right machining process isn't simply about removing material—it's about producing the features your part actually needs.
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com


**ges

Why do some gray iron castings or ductile iron castings appear perfectly sound after sand casting, only to reveal shrink...
02/07/2026

Why do some gray iron castings or ductile iron castings appear perfectly sound after sand casting, only to reveal shrinkage cavities in the central bore after CNC machining?
This is a problem that many foundries have encountered during production; such defects are particularly common in industrial castings featuring central bore structures, such as pump bodies, valve bodies, and bearing housings.
The truly frustrating aspect is that these sand casting parts often show no abnormalities during cleaning, shot blasting, or even visual inspection; however, once they reach the CNC machining stage, shrinkage cavities appear in the central bore area, leading to rework, scrap, and even delays in project delivery schedules.
Why does this happen?
Many people immediately suspect the material composition, but in reality, central bore shrinkage is rarely just a material issue; rather, it stems from a lack of optimal alignment between the solidification sequence and the feeding conditions.
When the area near the central bore becomes a "hot spot" that solidifies last—and liquid metal cannot continuously feed it—internal shrinkage cavities can form, even if the chemical composition meets specifications. This explains why certain defects only become apparent after machining.
When encountering similar issues, Longway typically does not rush to modify all process parameters; instead, it focuses on analyzing the following aspects first:
✔ Has a hot spot formed in the central bore area? Is the solidification proceeding in a reasonably directional manner?
✔ Has the gating position altered the casting's temperature distribution—keeping the outer edges hot for too long and thereby disrupting the feeding path?
✔ Do the riser design or external chills effectively improve feeding conditions in the final solidification zone?
✔ Have the carbon equivalent, silicon content, inoculation effect, and pouring temperature been appropriately matched to the casting's structure, wall thickness, and performance requirements, rather than relying on fixed parameters?
For pump and valve components, construction machinery components, agricultural machinery components, and other industrial equipment parts manufacturers, the internal quality of castings not only affects machining efficiency, but also directly relates to sealing performance, assembly precision, and the long-term reliability of products.
Therefore, the most effective solution is not to constantly tweak parameters after defects appear, but to identify potential risks early—during the product development phase—through process reviews, solidification simulations, optimization of gating and riser systems, and manufacturability analysis, thereby eliminating problems before mass production begins. Longway has always maintained that an outstanding casting supplier should do more than simply produce castings according to blueprints; they must possess the engineering capability to anticipate process risks and optimize manufacturing solutions.
For OEM castings, the true value lies not in detecting shrinkage defects, but in preventing them as much as possible during the trial production stage.
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com




Investment Casting InsightsWhy is investment casting more than just "pouring a ladle of molten steel"?When it comes to ...
01/07/2026

Investment Casting Insights
Why is investment casting more than just "pouring a ladle of molten steel"?
When it comes to investment casting, many people first think of the scene where high-temperature molten steel is poured into the mold.
In fact, what really determines the quality of a casting is not the pouring moment, but the entire manufacturing process.
From wax pattern creation, shell building, dewaxing, and firing to pouring, shell removal, heat treatment, cnc machining, surface finishing, and final inspection—each step impacts the next and dictates the final product's dimensional accuracy, surface quality, and performance stability.
For instance:
Wax pattern consistency affects dimensional stability;
Mold shell quality influences surface finish and contour integrity;
Heat treatment determines mechanical properties;
And subsequent machining and inspection ensure the product meets assembly and operational requirements.
Precisely for this reason, even when using the same materials, investment castings from different manufacturers can still exhibit significant differences in quality consistency and performance during downstream processing.
From the raw material entering the factory to the finished product leaving the factory, Longway relies on the quality management system throughout the manufacturing process to provide high-quality customized parts to customers in the fields of agricultural machinery components, engineering machinery components, pump valve components, power transmission parts and other fields.
Starting today, we are launching the "Investment Casting Insights" series to guide you through each critical stage of investment casting and explain how they collectively determine the final quality of a casting.
Because we believe:
A truly superior investment casting is never the result of excelling at just one step, but of executing every single step to perfection.
“Over the next few weeks, we'll explore each stage and explain how it influences casting quality.”
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com

For many mechanical components, the choice of manufacturing process is determined not merely by the material, but by pro...
30/06/2026

For many mechanical components, the choice of manufacturing process is determined not merely by the material, but by production volume and operating conditions.
In sectors such as agricultural machinery parts, construction equipment parts,and power transmission parts, like connecting yokes, fl**ges, connecting rods, gears,axle shafts,splined shafts,sprockets and hub forgings are frequently produced using closed-die forging.
This choice is made not because closed-die forging is inherently "superior," but because it is better suited for mass production.
During the closed-die forging process, metal is shaped under high pressure within a die cavity; this ensures consistent dimensional accuracy and aligns the material's grain flow with the part's contour, thereby enhancing strength and fatigue resistance.
Compared to machining directly from bar stock, closed-die forging offers distinct advantages: higher material utilization and reduced raw material waste; minimal machining allowance (as the forging closely resembles the final shape), which significantly cuts down on subsequent cnc turning, cnc milling, and cnc grinding operations; and greater product consistency during mass production.
There is no single "universal" manufacturing process. For small-batch orders, complex geometries, or large-scale workpieces, methods such as open-die forging, investment casting, or direct cnc machining from bar stock often offer better cost-effectiveness.

Therefore, during the initial stages of a new project, we comprehensively evaluate factors such as part geometry, material, annual volume, and finishing requirements to tailor the most economical and rational production solution for the client, rather than simply recommending a single process across the board.
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com
**ges

29/06/2026

In mechanical manufacturing, cnc turning is the most fundamental metal-cutting process.
Many people view turning merely as a method to machine round stock to specific dimensions; however, its more critical role lies in establishing the datums for subsequent machining operations.
For shaft-type components—such as transmission shafts, gear shafts and fl**ged shafts—parameters like outer diameter, end-face perpendicularity, and overall coaxiality directly influence the quality of downstream processes (such as milling, drilling, and internal grinding) and ultimately determine the fit and assembly precision of the finished product.
A stable, high-quality turning process not only ensures strict adherence to dimensional tolerances but also significantly reduces the workload for adjustments and corrections in later stages, guaranteeing consistent precision across mass-produced parts.
At Longway, we provide one-stop manufacturing services—including investment casting, sand casting, forging, and CNC machining—tailored to customer drawings and application requirements. From raw blank production to precision machining, we deliver customized component solutions for industries such as agricultural machinery parts, construction machinery parts, pumps and valves parts, and power transmission parts.
📱: wa.me/8618132570788
📞：+86 181 3257 0788
📧: [email protected]
🌐:www.bdlongway.com

**gedshafts

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