Product Description
Product Description
| Professional High Precision Plastic Injection CZPT Factory | |
| Mould material | P20, 718, NAK80, S316H |
| Hardness of steel | Vacuum quenching, nitride, hrc41-47, hrc46-50, hrc60 |
| Mould base | LKM, HASCO |
| Mould cavity | Single / Multi |
| Runner system | Hot / Cold |
| MoInjection machies equipments | According to product precision to choice the different model 100T,128T,150T,200T,250T,368T,450T injection machine. |
| Inspection | 100% inspection by QC, QA before shipping. |
| Fast CZPT design | Can be within 1-3 working days after getting customer’s drawings |
| Lead time | Plastic moulds : 3- 6 weeks after getting the CZPT design confirmation |
| Mould testing | All of the moulds can be well tested before the shipments. Videos for moulds trial running are available. |
| Minimum order | Small orders for injection moulding can be accepted |
| Production capacity | 50 sets/month |
| CAD for quote | Step.& dwg. |
| Mould life | 100-500K shots |
| After sales service | Available by our staff with more than 10 years of working experience in this field |
Product Show
| CNC Plastic Precision Mechanical Dummy Prototype | 1. CNC ABS part |
| 2. CNC PC clear part | |
| 3. CNC plastic part | |
| 4. CNC machining prototype | |
| 5. Vacuum casting molding | |
| 6. Vacuum casting TPU part | |
| 7. Silicon rubber molding partpart | |
| 8. Small production by SLA/vacuum casting | |
| Plastic material | ABS, PP, PC, POM, NYLON, TPE, TPU etc |
| Color | RAL/PANTONE color |
| Prototype surface finish | Polishing finish,Texture Finish,Glossy Finish,Painting,Slik print,Rubber Painting etc |
Manufacturing Ability
Our Service
| ScHangZhou & 3D drawing | can make a 3D drawing through scHangZhou machine with sample | |
| CNC Machining prototype | ABS, PC, Nylon, good strength, same material features as injection parts | |
| SLA & 3D print prototype | cost effective for part show or design test | |
| Vacuun casting mold/Silicon mold | for TPU or rubber material, color part available | |
| Plastic injection mould | soft tooling or production mould, can do switch runner at single tool to save tooling investment | |
| Injection moulding parts | ABS, PC, POM, TPU, overmolding parts, can provide painting or logo print service | |
| Advantages | Confidentiality | Signed NDA documents to ensure all your information discussed be confidential. We will also train the staff with detailed regulations and not showing the staff full data if not necessary. |
| Initiative communication |
Through many years cooperation with our partners, we are confident to provide you satisfied quality with a reasonable price. Not only providing satisfied quality and on-time delivery, but we also have a dedicated and initiative staff for every issue happened in the process. | |
| Efficient service | For some urgent issues, we provide 7*24 hours for timely feedback.We will reply your mail within 12 hours or earlier since our team members are energetic and all using smartphone devices.Please add our or for better communication | |
| Advantage in price | We are also happy to follow up your other projects which need outsourcing service, what we think is to save your plant visit cost and transportation cost etc. Our team’s goal is to work hard to find out the best price with good quality products for our customers and achieve more trust and confidence on both sides |
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Packaging & Shipping
| Delivery Method: | Payment Terms: | Warranty Period: |
| Sample by Express Courier, such as DHL, Fedex,UPS, TNT, EMS etc.; Bulk Order by Air, by Load or by Sea; | We accept TT, western union, paypal, moneygram, Escrow , (if you prefer other ways ,pls let us know) | We cherish every cooperation chance, and treat customer as friend. Production quality will always be same with sample test. For defected goods, we will re-produce and ship out for replacement |
Company Profile
Why Choose Us
FAQ
Q1:What is your business scope?
A1: Our factory provides CNC plastic prototype, Plastic injection mould, moulding production, logo print and color painting.
Q2:Can you help to share an idea for a new product?
A2: Yes. We are always happy to cooperate with potential customers to evaluate the technical feasibility. Like, choose the right material, optimized the design, DFM report, and building cost etc.
Q3:Can you make double color injection mold or over-molding mould?
A3: Yes, we can. Have made lots of double color molds for brand earphones.
Q4:Which country do you frequently work with?
A4: Our customer groups mainly from USA, Canada, Mexico, Australia, Japan, Singapore, India, Israel etc.
Q5:How to have my components quoted?
A5: Please share us your drawings with 3D format (.STEP or .IGES files) and detailed BOM sheet. We are pleased to sign the NDA with your company.
Q6:Can I have precision prototypes for testing before tooling design?
A6: Sure, our factory can prepare the prototype with surface finish and color painting, either CNC machining or SLA 3D printing is available.
Q7:What is the lead time for CNC prototypes?
A7: It is about 4 to 7 days for qty less than 5sets, and 7 to 12 days for qty above 10sets. Before painting process, we will polish and test part assembly, and then share video for confirmation.
Q8:We’ve decided to go ahead for the project. How long will it take to get T1 parts?
A8: It takes 3 to 4 weeks to have the mould/tooling manufactured well before first tooling trial. Once the part quality approved with good quality by your side, you can expect parts delivery within 2 weeks.
How to Calculate Stiffness, Centering Force, Wear and Fatigue Failure of Spline Couplings
There are various types of spline couplings. These couplings have several important properties. These properties are: Stiffness, Involute splines, Misalignment, Wear and fatigue failure. To understand how these characteristics relate to spline couplings, read this article. It will give you the necessary knowledge to determine which type of coupling best suits your needs. Keeping in mind that spline couplings are usually spherical in shape, they are made of steel.
Involute splines
An effective side interference condition minimizes gear misalignment. When 2 splines are coupled with no spline misalignment, the maximum tensile root stress shifts to the left by 5 mm. A linear lead variation, which results from multiple connections along the length of the spline contact, increases the effective clearance or interference by a given percentage. This type of misalignment is undesirable for coupling high-speed equipment.
Involute splines are often used in gearboxes. These splines transmit high torque, and are better able to distribute load among multiple teeth throughout the coupling circumference. The involute profile and lead errors are related to the spacing between spline teeth and keyways. For coupling applications, industry practices use splines with 25 to 50-percent of spline teeth engaged. This load distribution is more uniform than that of conventional single-key couplings.
To determine the optimal tooth engagement for an involved spline coupling, Xiangzhen Xue and colleagues used a computer model to simulate the stress applied to the splines. The results from this study showed that a “permissible” Ruiz parameter should be used in coupling. By predicting the amount of wear and tear on a crowned spline, the researchers could accurately predict how much damage the components will sustain during the coupling process.
There are several ways to determine the optimal pressure angle for an involute spline. Involute splines are commonly measured using a pressure angle of 30 degrees. Similar to gears, involute splines are typically tested through a measurement over pins. This involves inserting specific-sized wires between gear teeth and measuring the distance between them. This method can tell whether the gear has a proper tooth profile.
The spline system shown in Figure 1 illustrates a vibration model. This simulation allows the user to understand how involute splines are used in coupling. The vibration model shows 4 concentrated mass blocks that represent the prime mover, the internal spline, and the load. It is important to note that the meshing deformation function represents the forces acting on these 3 components.
Stiffness of coupling
The calculation of stiffness of a spline coupling involves the measurement of its tooth engagement. In the following, we analyze the stiffness of a spline coupling with various types of teeth using 2 different methods. Direct inversion and blockwise inversion both reduce CPU time for stiffness calculation. However, they require evaluation submatrices. Here, we discuss the differences between these 2 methods.
The analytical model for spline couplings is derived in the second section. In the third section, the calculation process is explained in detail. We then validate this model against the FE method. Finally, we discuss the influence of stiffness nonlinearity on the rotor dynamics. Finally, we discuss the advantages and disadvantages of each method. We present a simple yet effective method for estimating the lateral stiffness of spline couplings.
The numerical calculation of the spline coupling is based on the semi-analytical spline load distribution model. This method involves refined contact grids and updating the compliance matrix at each iteration. Hence, it consumes significant computational time. Further, it is difficult to apply this method to the dynamic analysis of a rotor. This method has its own limitations and should be used only when the spline coupling is fully investigated.
The meshing force is the force generated by a misaligned spline coupling. It is related to the spline thickness and the transmitting torque of the rotor. The meshing force is also related to the dynamic vibration displacement. The result obtained from the meshing force analysis is given in Figures 7, 8, and 9.
The analysis presented in this paper aims to investigate the stiffness of spline couplings with a misaligned spline. Although the results of previous studies were accurate, some issues remained. For example, the misalignment of the spline may cause contact damages. The aim of this article is to investigate the problems associated with misaligned spline couplings and propose an analytical approach for estimating the contact pressure in a spline connection. We also compare our results to those obtained by pure numerical approaches.
Misalignment
To determine the centering force, the effective pressure angle must be known. Using the effective pressure angle, the centering force is calculated based on the maximum axial and radial loads and updated Dudley misalignment factors. The centering force is the maximum axial force that can be transmitted by friction. Several published misalignment factors are also included in the calculation. A new method is presented in this paper that considers the cam effect in the normal force.
In this new method, the stiffness along the spline joint can be integrated to obtain a global stiffness that is applicable to torsional vibration analysis. The stiffness of bearings can also be calculated at given levels of misalignment, allowing for accurate estimation of bearing dimensions. It is advisable to check the stiffness of bearings at all times to ensure that they are properly sized and aligned.
A misalignment in a spline coupling can result in wear or even failure. This is caused by an incorrectly aligned pitch profile. This problem is often overlooked, as the teeth are in contact throughout the involute profile. This causes the load to not be evenly distributed along the contact line. Consequently, it is important to consider the effect of misalignment on the contact force on the teeth of the spline coupling.
The centre of the male spline in Figure 2 is superposed on the female spline. The alignment meshing distances are also identical. Hence, the meshing force curves will change according to the dynamic vibration displacement. It is necessary to know the parameters of a spline coupling before implementing it. In this paper, the model for misalignment is presented for spline couplings and the related parameters.
Using a self-made spline coupling test rig, the effects of misalignment on a spline coupling are studied. In contrast to the typical spline coupling, misalignment in a spline coupling causes fretting wear at a specific position on the tooth surface. This is a leading cause of failure in these types of couplings.
Wear and fatigue failure
The failure of a spline coupling due to wear and fatigue is determined by the first occurrence of tooth wear and shaft misalignment. Standard design methods do not account for wear damage and assess the fatigue life with big approximations. Experimental investigations have been conducted to assess wear and fatigue damage in spline couplings. The tests were conducted on a dedicated test rig and special device connected to a standard fatigue machine. The working parameters such as torque, misalignment angle, and axial distance have been varied in order to measure fatigue damage. Over dimensioning has also been assessed.
During fatigue and wear, mechanical sliding takes place between the external and internal splines and results in catastrophic failure. The lack of literature on the wear and fatigue of spline couplings in aero-engines may be due to the lack of data on the coupling’s application. Wear and fatigue failure in splines depends on a number of factors, including the material pair, geometry, and lubrication conditions.
The analysis of spline couplings shows that over-dimensioning is common and leads to different damages in the system. Some of the major damages are wear, fretting, corrosion, and teeth fatigue. Noise problems have also been observed in industrial settings. However, it is difficult to evaluate the contact behavior of spline couplings, and numerical simulations are often hampered by the use of specific codes and the boundary element method.
The failure of a spline gear coupling was caused by fatigue, and the fracture initiated at the bottom corner radius of the keyway. The keyway and splines had been overloaded beyond their yield strength, and significant yielding was observed in the spline gear teeth. A fracture ring of non-standard alloy steel exhibited a sharp corner radius, which was a significant stress raiser.
Several components were studied to determine their life span. These components include the spline shaft, the sealing bolt, and the graphite ring. Each of these components has its own set of design parameters. However, there are similarities in the distributions of these components. Wear and fatigue failure of spline couplings can be attributed to a combination of the 3 factors. A failure mode is often defined as a non-linear distribution of stresses and strains.
