China Professional Fpic Plastic Parts Plastic Products Injection Molding Plastic Injection Automotive Parts Plastic Injection Molding ABS Plastic Part with high quality

Product Description

New Raw Material PC Nylon PA66 GF30 ABS PBT LCP Electronic OEM Injection Molding Plastic Parts

   Forman has specialized in the fabrication industry since found in 1999, and we offer one-stop whole services from mold fabrication, plastic injection, metal stamping, assembly&package, surface treatment, and shipment. Our products are popularly used for electronics, automobiles, medical, transportation and so on.

Product Description


Our Capacity Full-Auto Production Line for plastic injection, metal stamping, and assembly services.
Our Max. Stamping Machine Tons.  200 Tons. 
Our Max Injection Machine Tons 300 Tons
Our Production Cycles 21 working days for the new mold and within 7 working days for exiting model
(Depends on the QTY)
Our Certificate ISO9001: 2015; ISO14001: 2015; IATF16949: 2016
Quality Assurance 100% quality assurance.
Plastic Injection Machine 25 sets, 16 sets for the Horizontal machine, and 9 sets for the vertical one.
Injection Material ABS, PBT, LCP, PA66, PA9T, BK337, etc.
Plastic raw material brand KURARAY, Dupont, Lanxess, etc.
Automatic Injection Process Yes.

Good price PBT Plastic Parts Custom Injection Molding Spare Parts
Plastic Injection Projects
Plastic Injection Products


Production Area

   Forman has strong development and fabrication services for various electronic parts and OEM high-end products. We adopt the automatic injection, stamping, and assembly processes, and all our operations are compliant with ISO9001, ISO14001, and IATF16949 systems.


Department Equipment Ton  Quantity
Mold-Making Department Sodick




Injection Department Vertical Molding Machine 55T 4
Horizontal Injection Machine 30T~180T 16
Stamping Department Progressive Punch 35T~110T 24
Assembly Department Customized automatic assembly machine / Over 200


The Mold-Making Department

The Injection Molding Department

Vertical Injection Department

The Automatic Stamping Department

The Automatic Assembly Department

     Forman’s annual sales amount is over USD 15,000,000 that the output of plastic parts is 31KK pcs, the stamping part is 54KK pcs and the assembly component is almost 20KK pcs. 

Company Profile

  HangZhou Forman Precision Industry Co., Ltd was established in 1999, from the beginning, we have been focusing on the development, production, and marketing services for precise components, like plastic injection and metal stamping parts, heat sink, electronic connectors. In recent years, we received more and more auto components’ orders, mainly from Germany, Italy, France, America, Mexico, and other countries. Until the end of 2571, the plant covers over 10 thousand square meters, our total investment capital is almost USD10 million, and the annual sales amount is higher than USD15 million.


   Forman has been attaching importance to talent team building and the average industry experience of our technical and managerial personnel over 10 years. On the strength of good management, through the normative operation procedure, based on the ERP, ISO9001, ISO14000, and IATF16949 systems, our company has always been keeping in a good and healthy operation condition.

   By the philosophy of “Focus on Customer, Contributor Based, and Always Going All Out”, Forman has established a long-term cooperation relationship with many world-famous companies. There is no doubt that the capability of quality controlling, super flexible delivery, and continuous cost optimization can lead a long-term development, we look forward to working together with you for mutual development and benefits.

Our Advantages

    Forman has over 20 years of development, and production capacity of electronic components, and passed the IATF16949 certification with have strong technical and equipment support for automotive components. 

Quality Management

     Forman clearly understands the quality importance for a company, therefore, every aspect from product designing, producing, to inspecting has been paid attention to. High-Efficiency ABS PBT Plastic Parts Custom Injection Molding Spare Parts

Packaging & Shipping

Packaging: Most of our plastic products are packed in PE bags, Tray, but it depends on the application and requirement.

Delivery: By Air, By Truck, By sea and express.


PBT plastic parts custom injection molding spare parts
1: Q: Can you introduce your working process and your advantages?

A: Thanks for your question, first we will ask for your drawing, requirement, QTY, and more detailed information to understand your demand, and our engineer can offer the best solution according to these specifications. Sometimes we will offer the structure improvement program when we find any issue from your design or any suggestion to keep the cost down. Then we can start mold design and fabrication when the price settles down, delivery time is approved. About our feature, that we would like to say 100% quality assurance and advantage facilities can give you strong support and our professional service will lead you to make great progress on this project.

2: Q: Do you have any experience cooperating with brand companies?

A: Definitely yes, we are the T1 supplier of that international enterprise and Chinese companies. Always keep mutual trust and friendly relationships, thanks for their support in our 20 years of development.

3: Q: Can you ensure your production lead time and stable quality in a long-term relationship?

A: Of course. Except for the Chinese New Year holiday, our shipments are always on a schedule of our scientific work arrangements, strong production competence, and reliable employee.

Kindly send us an inquiry ↓ to ask for more detailed information, thank you so much.

Analytical Approaches to Estimating Contact Pressures in Spline Couplings

A spline coupling is a type of mechanical connection between 2 rotating shafts. It consists of 2 parts – a coupler and a coupling. Both parts have teeth which engage and transfer loads. However, spline couplings are typically over-dimensioned, which makes them susceptible to fatigue and static behavior. Wear phenomena can also cause the coupling to fail. For this reason, proper spline coupling design is essential for achieving optimum performance.

Modeling a spline coupling

Spline couplings are becoming increasingly popular in the aerospace industry, but they operate in a slightly misaligned state, causing both vibrations and damage to the contact surfaces. To solve this problem, this article offers analytical approaches for estimating the contact pressures in a spline coupling. Specifically, this article compares analytical approaches with pure numerical approaches to demonstrate the benefits of an analytical approach.
To model a spline coupling, first you create the knowledge base for the spline coupling. The knowledge base includes a large number of possible specification values, which are related to each other. If you modify 1 specification, it may lead to a warning for violating another. To make the design valid, you must create a spline coupling model that meets the specified specification values.
After you have modeled the geometry, you must enter the contact pressures of the 2 spline couplings. Then, you need to determine the position of the pitch circle of the spline. In Figure 2, the centre of the male coupling is superposed to that of the female spline. Then, you need to make sure that the alignment meshing distance of the 2 splines is the same.
Once you have the data you need to create a spline coupling model, you can begin by entering the specifications for the interface design. Once you have this data, you need to choose whether to optimize the internal spline or the external spline. You’ll also need to specify the tooth friction coefficient, which is used to determine the stresses in the spline coupling model 20. You should also enter the pilot clearance, which is the clearance between the tip 186 of a tooth 32 on 1 spline and the feature on the mating spline.
After you have entered the desired specifications for the external spline, you can enter the parameters for the internal spline. For example, you can enter the outer diameter limit 154 of the major snap 54 and the minor snap 56 of the internal spline. The values of these parameters are displayed in color-coded boxes on the Spline Inputs and Configuration GUI screen 80. Once the parameters are entered, you’ll be presented with a geometric representation of the spline coupling model 20.

Creating a spline coupling model 20

The spline coupling model 20 is created by a product model software program 10. The software validates the spline coupling model against a knowledge base of configuration-dependent specification constraints and relationships. This report is then input to the ANSYS stress analyzer program. It lists the spline coupling model 20’s geometric configurations and specification values for each feature. The spline coupling model 20 is automatically recreated every time the configuration or performance specifications of the spline coupling model 20 are modified.
The spline coupling model 20 can be configured using the product model software program 10. A user specifies the axial length of the spline stack, which may be zero, or a fixed length. The user also enters a radial mating face 148, if any, and selects a pilot clearance specification value of 14.5 degrees or 30 degrees.
A user can then use the mouse 110 to modify the spline coupling model 20. The spline coupling knowledge base contains a large number of possible specification values and the spline coupling design rule. If the user tries to change a spline coupling model, the model will show a warning about a violation of another specification. In some cases, the modification may invalidate the design.
In the spline coupling model 20, the user enters additional performance requirement specifications. The user chooses the locations where maximum torque is transferred for the internal and external splines 38 and 40. The maximum torque transfer location is determined by the attachment configuration of the hardware to the shafts. Once this is selected, the user can click “Next” to save the model. A preview of the spline coupling model 20 is displayed.
The model 20 is a representation of a spline coupling. The spline specifications are entered in the order and arrangement as specified on the spline coupling model 20 GUI screen. Once the spline coupling specifications are entered, the product model software program 10 will incorporate them into the spline coupling model 20. This is the last step in spline coupling model creation.

Analysing a spline coupling model 20

An analysis of a spline coupling model consists of inputting its configuration and performance specifications. These specifications may be generated from another computer program. The product model software program 10 then uses its internal knowledge base of configuration dependent specification relationships and constraints to create a valid three-dimensional parametric model 20. This model contains information describing the number and types of spline teeth 32, snaps 34, and shoulder 36.
When you are analysing a spline coupling, the software program 10 will include default values for various specifications. The spline coupling model 20 comprises an internal spline 38 and an external spline 40. Each of the splines includes its own set of parameters, such as its depth, width, length, and radii. The external spline 40 will also contain its own set of parameters, such as its orientation.
Upon selecting these parameters, the software program will perform various analyses on the spline coupling model 20. The software program 10 calculates the nominal and maximal tooth bearing stresses and fatigue life of a spline coupling. It will also determine the difference in torsional windup between an internal and an external spline. The output file from the analysis will be a report file containing model configuration and specification data. The output file may also be used by other computer programs for further analysis.
Once these parameters are set, the user enters the design criteria for the spline coupling model 20. In this step, the user specifies the locations of maximum torque transfer for both the external and internal spline 38. The maximum torque transfer location depends on the configuration of the hardware attached to the shafts. The user may enter up to 4 different performance requirement specifications for each spline.
The results of the analysis show that there are 2 phases of spline coupling. The first phase shows a large increase in stress and vibration. The second phase shows a decline in both stress and vibration levels. The third stage shows a constant meshing force between 300N and 320N. This behavior continues for a longer period of time, until the final stage engages with the surface.

Misalignment of a spline coupling

A study aimed to investigate the position of the resultant contact force in a spline coupling engaging teeth under a steady torque and rotating misalignment. The study used numerical methods based on Finite Element Method (FEM) models. It produced numerical results for nominal conditions and parallel offset misalignment. The study considered 2 levels of misalignment – 0.02 mm and 0.08 mm – with different loading levels.
The results showed that the misalignment between the splines and rotors causes a change in the meshing force of the spline-rotor coupling system. Its dynamics is governed by the meshing force of splines. The meshing force of a misaligned spline coupling is related to the rotor-spline coupling system parameters, the transmitting torque, and the dynamic vibration displacement.
Despite the lack of precise measurements, the misalignment of splines is a common problem. This problem is compounded by the fact that splines usually feature backlash. This backlash is the result of the misaligned spline. The authors analyzed several splines, varying pitch diameters, and length/diameter ratios.
A spline coupling is a two-dimensional mechanical system, which has positive backlash. The spline coupling is comprised of a hub and shaft, and has tip-to-root clearances that are larger than the backlash. A form-clearance is sufficient to prevent tip-to-root fillet contact. The torque on the splines is transmitted via friction.
When a spline coupling is misaligned, a torque-biased thrust force is generated. In such a situation, the force can exceed the torque, causing the component to lose its alignment. The two-way transmission of torque and thrust is modeled analytically in the present study. The analytical approach provides solutions that can be integrated into the design process. So, the next time you are faced with a misaligned spline coupling problem, make sure to use an analytical approach!
In this study, the spline coupling is analyzed under nominal conditions without a parallel offset misalignment. The stiffness values obtained are the percentage difference between the nominal pitch diameter and load application diameter. Moreover, the maximum percentage difference in the measured pitch diameter is 1.60% under a torque of 5000 N*m. The other parameter, the pitch angle, is taken into consideration in the calculation.

China Professional Fpic Plastic Parts Plastic Products Injection Molding Plastic Injection Automotive Parts Plastic Injection Molding ABS Plastic Part     with high qualityChina Professional Fpic Plastic Parts Plastic Products Injection Molding Plastic Injection Automotive Parts Plastic Injection Molding ABS Plastic Part     with high quality