Suzhou Industrial Park Hojama Technology Co., Ltd

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Suzhou Industrial Park Hojama Technology Co., Ltd
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Suzhou Industrial Park Hojama Technology Co., Ltd.

Suzhou Industrial Park Hojama Technology Co., Ltd., established in March 2015, is a key player in ball screw manufacturing. HOJAMA delivers expert industrial manufacturing and automation solutions, offering comprehensive R&D, production, sales, and support services. We specialize in precision position control components, including ball screws, lead screws, linear guideways, ball splines, and linear modules, with a monthly production of 30,000 sets.

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WHY CHOOSE HOJAMA
Quality First / Service Always

Superior Quality

HOJAMA is dedicated to upholding the highest standards of quality and service. Our products are meticulously crafted under stringent production processes, and each item undergoes rigorous quality inspections to ensure excellence. We prioritize both precision and reliability, guaranteeing that every product meets our superior quality benchmarks.

Competitive Price

We offer a 100% guarantee of quality products at competitive prices, providing you with exceptional quality while ensuring you get your money's worth. Our competitive pricing strategy means that you will receive top quality products at unbeatable value prices, maximising your return on investment and satisfaction with every purchase.

Custom Service

HOJAMA provides bespoke services tailored to meet specific requirements, ensuring that every design and production detail is customized according to the unique specifications provided by our customers. This personalized approach guarantees that each project is completed to the highest standards, aiming for exceptional satisfaction and exceeding expectations.

Quick Response

Our expert marketing and after-sales service teams are available 7x24 to assist you. We are committed to delivering prompt and effective support to ensure you have a flawless and satisfying experience with our products and services. Whether you need assistance with product price, product details, or any other questions, our specialists are ready to provide professional guidance and customized solutions to address your specific needs.

QUALIFICATION CERTIFICATE

NEWS

Learning More About Technique

COMPANY NEWS INFORMSATION
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What is the difference between a lead screw and a ball screw?
Ball screws and lead screws are two commonly used drive components in mechanical systems, each with its advantages and disadvantages.   What are ball screws and lead screws? ——Ball screws consist of a screw, nut, steel balls, return mechanism, and dust protector. They can effectively transform rotational motion into linear movement, or convert torque into consistent, axial force output. ——Lead screws are made up of a screw shaft and a nut. The screw typically features a trapezoidal thread, while the nut mates with the screw shaft to achieve motion transfer.     What is the difference between a lead screw and a ball screw?   ——Efficiency: Ballscrew has a transmission efficiency between 90% and 99%, significantly higher than lead screws, which have an efficiency of 25% to 50%. Ball screw achieves higher efficiency due to their use of rolling friction, while leadscrews rely on sliding friction. As a result, ball screws consume less energy, which helps lower operating costs.     ——Precision and Play: Ball screws reduce friction through the use of steel balls and can eliminate play through preload, achieving nearly zero backlash. In contrast, lead screws, due to sliding friction, cannot achieve zero play, resulting in lower precision and stability.   ——Self-locking: Lead screws feature good self-locking properties which can help them to hold their position without external force. Ball screws with low friction, however, typically lack self-locking ability, especially when the pitch is large.   ——Heat Generation and Longevity: Ball screws generate much less heat, making them suitable for high-speed operation and offering longer service life. Lead screws, due to their sliding friction, produce more heat during extended use, requiring additional cooling, and generally have a shorter lifespan.   ——Application: Ball screws are commonly used in high-precision applications like CNC machines and positioning tables where precision and efficiency are critical. Lead screws are more suitable for applications with lower precision requirements and smaller loads, such as simple force transfer mechanisms.   ——Cost: Ball screws are more complex and thus more expensive. However, the price gap is narrowing as automation equipment becomes more widespread and production technology improves. Lead screws, with their simpler structure and lower cost, are ideal for budget-conscious applications.     Both ball screws and lead screws come with their unique advantages and drawbacks. Choosing between ball screws and lead screws should be based on the specific requirements of the application, budget constraints, and the needed levels of precision and efficiency.
  • 06
    2024-09
    What should be noted when using ball screw grease?
    Ball screws are widely used as precision transmission components due to their long service life, high rigidity, high efficiency, high sensitivity, and zero backlash characteristics. Proper lubrication is essential for ball screws, as insufficient lubrication can increase friction and wear, leading to failure or reduced lifespan. When using ball screw grease, the following points should be noted:   Check lubrication status: Before using the ball screw, ensure that the lubrication is in good condition. Poor lubrication can cause the ball screw to lose functionality within a short period.   Ball screw grease application: If grease has already been applied to the ball screw, it can be used directly. However, if dust or debris adheres to the surface of the grease during use, clean it off with an appropriate solvent.   Replacing ball screw grease: After cleaning the ball screw, reapply new grease of the same type as the original. Avoid mixing different types of grease, as this can negatively affect the ball screw's performance.   Regular ball screw grease inspection: It is recommended to inspect the grease 2 to 3 months after initial use. If the grease appears noticeably dirty, remove the old grease and apply fresh grease to ensure optimal ball screw performance and extend its lifespan.
  • 13
    2024-09
    What are the methods of ball screw mounting?
    Since ball screws operate with rolling motion, they are more efficient compared to lead screws, achieving a conversion efficiency of η = 88% -96% for rotary motion to linear motion. Additionally, precision ball screws, which are machined to a fine degree, can achieve micron-level feeding accuracy. When used in lifting mechanisms, measures such as braking must be implemented, such as using servo motors with brakes.   Ball Screw Mounting Method           1. Fixed-Free     This installation method has a low load capacity and low axial stiffness, making it suitable only for short screws.   Characteristics: This method features a simple structure, with low axial stiffness and critical speed, resulting in poor stability for the screw. It is commonly used for short strokes and vertical drive systems where one end is free, typically combined with angular contact bearings.   2. Fixed-Support     One end is fitted with a thrust bearing, while the other end is fitted with a deep groove ball bearing. When the ball screw is relatively long, the thrust bearing is fixed at one end, and the deep groove ball bearing supports the other end. To reduce the impact of thermal deformation on the screw, the mounting position of the thrust bearing should be kept away from heat sources.   This installation method is the most typical and commonly used for ball screw mechanisms, suitable for medium speeds with high stiffness and precision.   Note that the supporting end has relatively low rigidity, with one end using a combined angular contact bearing and the other a deep groove ball bearing.   3. Fixed-Fixed   This method can withstand high axial loads, with the axial stiffness of the screw being approximately four times greater than that of the fixed-support mounting method. It is suitable for applications requiring high speed, high precision, and relatively long screws, particularly in high-rigidity CNC machines.   A key feature of this support method is that the ball screw is pre-tensioned to compensate for thermal deformation caused by frictional heat during high-speed rotation, with both ends fitted with combined angular contact bearings in a DT-DB arrangement.   However, this structure has drawbacks; adjustments can be cumbersome. If the pre-tension at both ends is too high during installation, the actual travel of the ball screw may exceed the designed travel, resulting in a larger pitch than intended. Conversely, insufficient pre-tension on the nuts can cause the opposite effect, potentially leading to machine vibration and decreased precision.   4. Support-Support     This method is suitable for general applications that require medium speed and do not have high demands for stiffness and precision. The structure is simple, with low rigidity and poor load-bearing conditions, leading to less frequent use. Both ends are fitted with deep groove ball bearings.  
  • 20
    2024-09
    How to use go /no go gauge check ball screw thread?
    Thread Tolerance Standards Unified Inch Thread - External threads: classified into grades 1A, 2A, and 3A. - Internal threads: grades 1B, 2B, and 3B. Higher grade numbers mean tighter fits, which is crucial for mechanical assembly compatibility. Metric Thread - Grades like 4h, 6h, and 6g define tolerances for external threads for precise fits in various applications.   Go and No-Go Gauges Importance - Essential tools in precision mechanical manufacturing and quality control. Crucial to inspect if threaded components, including those related to ball screws, conform to standards to prevent assembly issues and ensure mechanical system reliability. Manufacturing Standards - Produced according to international and national standards like ISO, ANSI, and DIN to ensure thread accuracy and compatibility, which is vital for quality control in ball screw manufacturing. Function 1) Go Gauge (“T”) - Verifies minimum tolerance limits of threads. If it can't fully screw into a threaded component (e.g., a ball screw thread), it indicates the thread is smaller than the permitted minimum size, potentially leading to fastening and mechanical failure. It must be calibrated regularly.   2) No-Go Gauge (“Z”) - Verifies maximum tolerance limits of threads. Should only screw into the component to a specific depth (usually one-third). If it goes deeper, the thread exceeds the standard maximum size, indicating non-compliance. Efficiency in Quality Control More efficient than individual precision instrument measurements. Provide a quick way to ensure products, including ball screw components, fall within tolerance ranges, enhancing manufacturing productivity. Practical Application For example, with ball screws, if the Go gauge passes smoothly, the thread meets the minimum size requirements. Then the No-Go gauge is used to check maximum size compliance. If it turns more than the specified limit, the thread is non-compliant and should be discarded. The Go gauge is always longer than the No-Go gauge as the Go gauge should fit while the No-Go gauge indicates non - compliance. Differences Between Go and No-Go Gauges The Go gauge ensures parts, such as those of ball screws, fit snugly within the specified tolerance range to confirm compliance. The No-Go gauge is designed to not exceed the upper tolerance limit, marking oversized components as unacceptable.       Go and No-Go gauges are vital for ensuring threaded components adhere to standards. Their efficient use in quality control helps manufacturers maintain high-quality products, avoid costly assembly problems, and produce reliable mechanical systems, enhancing safety and operational efficiency.
  • 30
    2024-08
    What is the life expectancy of a ball screw?
    Estimation of Ball Screw Life and Influencing Factors   Ball screws are essential components in mechanical transmission, and their lifespan directly affects the performance and reliability of equipment.    Definition of Ball Screw Lifespan The lifespan of a ball screw refers to the total number of rotations, time, or distance at which the balls or the rolling surfaces of the ball screws begin to show signs of fatigue and flaking under alternating stress.   According to industry standards, the expected lifespans for different types of equipment are as follows:   Machine tools: 20,000 hours Automatic control devices: 15,000 hours Industrial machinery: 10,000 hours Measuring devices: 15,000 hours   Estimation of High-Precision Ball Screw Lifespan The lifespan of high-precision ball screws is typically estimated using the L10 lifespan. The L10 lifespan indicates the expected lifespan that 90% of the ball screws can achieve under the same operating conditions. For example, if a certain ball screw has an L10 lifespan of 5,000 hours, then 90% of the ball screws can operate normally for up to that time.     According to ISO 281 standards, the calculation formula for the rated lifespan of a ball screw is as follows:   Lh=(PC​)³×10^6÷(60×n)   Lh: rated lifespan (in hours)C: basic dynamic load (in N) P: equivalent dynamic load (in N) n: rotational speed (in r/min)   Key Factors Affecting Ball Screw Lifespan Material and Processing Technology Materials with good fatigue resistance and wear resistance should be selected, and precision in the manufacturing process should be ensured to minimize errors. HOJAMA ball screws typically use high-quality bearing steel and stainless steel, and materials can be adjusted based on customer needs.   Operating Environment and Conditions Environmental factors such as temperature, humidity, corrosive gases, as well as load, speed, and vibration conditions, all influence the lifespan of ball screws. Therefore, it is essential to consider the adaptability to different working environments during the design phase.   Lubrication and Maintenance Proper lubrication and regular maintenance are critical for extending the lifespan of ball screws. Adequate lubrication can reduce friction and wear, maintaining the cleanliness and stability of the ball screw device. Regular replacement of lubricants and removal of dust and impurities are vital maintenance tasks.   Installation and Maintenance Correct installation and regular maintenance are key to ensuring the normal operation of ball screws. Installation should follow the manual guidelines to avoid uneven force or misalignment, and regular inspections and repairs should be conducted to timely replace worn components in ball screws.     Estimating the lifespan of high-precision ball screws is a comprehensive process that requires consideration of materials, technology, environment, lubrication, and maintenance.  
What causes the clearance of ball screw?
Analysis of the Causes of Ball Screw Clearance Ball screws are precision components widely used in industrial machinery and equipment, playing a vital role in converting rotary motion into linear motion with high accuracy and efficiency. However, a common problem that affects its performance is the clearance or backlash between the ball nut and the screw shaft. This article will delve into the causes of this backlash.     1. No or insufficient preload   Non-preloaded ball screws will slide down when placed vertically with the nut rotating due to its own weight; and there will be considerable backlash, so they can only be used in machines with low operating resistance, with special consideration given to the requirement for positioning accuracy. Different applications determine the correct amount of preload and adjust the preload before shipment; therefore, when you order ball screws, please describe the operation of the equipment.   2. Too much torsional displacement   1) Improper heat treatment, too thin hardened layer, uneven hardness distribution, or too soft material The standard hardness of steel balls, nuts, and screws are HRC 62~66, HRC 58~62, and HRC 56~62 respectively.   2) Improper design The slender ratio is too large, the smaller the length and diameter ratio of the screw the higher the rigidity, the limit of the slender ratio must be below 60 if the length and diameter ratio is too large the screwball will produce the sagging of the self-weight.   3. Improper bearing selection   Usually, industrial ball screws must be used with angled bearings, especially those designed with high-pressure angles; when the precision ball screws are subjected to axial loads, general deep groove ball bearings produce a certain amount of axial backlash, so deep groove ball bearings are not suitable for this purpose.   4. Improper bearing mounting   1) If the bearing is mounted on the ball screw assemblies and they do not fit perfectly that the backlash will come for axial loads, which may be caused by too long or too short shoulder of the screw. 2) Poor perpendicularity can lead to misalignment between the bearing seat surface and the axis of the locking nut's V-groove, or poor parallelism between the locking nut’s surface in two corresponding directions, resulting in skew. Therefore, to ensure perpendicularity, the locking nut’s V-groove at the shoulder and the bearing seat surface should be machined simultaneously, with grinding processes being the preferred method. 3) Two locking nuts with spring washers are used to secure the bearing to prevent dislodgement during operation.   5. Insufficient rigidity of nut seats / bearing seats If the nut seat or bearing seat is not sufficiently rigid, it will deflect due to the weight of the element itself or the load of the machine.   6. Improperly assembled nut seats / bearing seats   1) Element dislodged due to vibration or unsecured pin. Replace spring pins with solid pins for positioning purposes. 2) The fixed screws of the ballscrew nut cannot be tightened because the fixed screws are too long or the screw holes of the nut are too shallow. 3) The fixed screws of the nut come loose due to vibration or lack of spring washers.   7. Surface parallelism or flatness of the screw support is out of tolerance Regardless of whether the surface of the bonding element is ground or scratched, as long as its parallelism or flatness is out of tolerance, the reproduction accuracy of the position during the movement of the bed table will be poor; therefore, in a machine, a thin spacer is usually used between the support base and the body of the machine to achieve the purpose of adjustment.  
  • 09
    2024-10
    Fault Diagnosis of Ball Screw Pair in the Treatment of Common Faults of CNC Machine Tools
    The majority of ball screw pair failures are caused by reduced motion quality, excessive backlash, mechanical creep, and poor lubrication. We will analyze the causes of different failure phenomena of ball screws and put forward corresponding solutions.   1. High roughness value of processed parts 1) The lubricating oil of the guide rail is not enough, causing the sliding plate to crawl Method: Add lubricating oil to eliminate lubrication failure  2) The ball screw is partially rough or damaged Method: Replace or repair the screw  3) The screw bearing is damaged and the movement is not stable Method: Replace damaged bearings  4)The servo motor is not adjusted well, and the gain is too large Method: Adjust the servo motor control system   2. Large reverse error and unstable processing accuracy 1) Loose cone sleeve of screw shaft coupling Method: Retighten and repeat the test with a dial indicator 2) The screw shaft slide plate is too tight or too loose with the pressure plate Method: Re-adjust or repair, use 0.03mm ruler to be qualified 3)Screw shaft slide with wedge iron is too tight or too loose Method: Re-adjust or repair to make the contact rate reach over 70%     3. Too large  torque of the ball screws 1) Two skateboards cooperate with the pressure plate too tight or damaged Method: Readjust or repair the pressure plate to make the 0.04mm caliper plug not qualified 2) The ball screw nut reverser is damaged, the ball screw is stuck or the shaft end nut pretension is too large Method: Repair or replace the screw and adjust it carefully 3) Servo motor and ball screw are connected to different shafts Method: Adjust the coaxial and tighten the connection seat   4. Poor lubrication of screw nut 1) Whether the oil separator divides the oil Method: Check the quantitative oil separator 2) Whether the oil pipe is blocked Method: Remove dirt and make the tubing unblocked   5. Ball screw noise 1) The ball screw bearing gland is not pressed properly Method: Adjust the gland to make it tight against the bearing 2) Poor lubrication of ball screw Method: Check the oil separator and the oil circuit to make sure the oil is sufficient  
  • 02
    2024-10
    Ball screw nut installation method
    The ball screw nut pair is only used to bear the axial load, radial force, bending moment will make the ball screw nut auxiliary surface contact stress and other loads, which may cause permanent damage to the screw. Correct installation is a prerequisite for effective maintenance. Therefore, the following points should be noted when installing the ballscrew nut assembly into the machine tool: 1) The axis of the screw must be parallel to the axis of the matched guide rail. The bearing seat and nut seat at both ends of the machine must be in line at three points. 2) Mount the nut as close as possible to the support bearing. 3) Install the support bearing as close to the nut installation as possible. 4) When installing the ball screw into the machine, do not remove the nut from the screw. If you must remove the auxiliary sleeve, otherwise the ball may fall off during loading and unloading. When handling nuts, note the following points: (1) The auxiliary sleeve outer diameter should be smaller than the bottom diameter of the screw by 0.1-0.2mm. (2) During use, The auxiliary sleeve must be tightly threaded around the threaded shaft shoulder. (3) do not use too much force when unloading to avoid damage to the nuts. (4) Avoid impact and eccentricity when installing the mounting hole. How to install the ball screw nut ball methodFirst of all, users are not recommended to disassemble and install nuts themselves, especially high-precision ball screws. If the nut accidentally falls off or you have now disassembled, please reinstall the nut by following the following method: Make an outside diameter slightly smaller than the bottom diameter of the screw raceway (smaller than 0.1mm), and the inside diameter is slightly larger than the outside diameter of the screw end (Large 0.5~2mm) Hollow sleeves with a length longer than the nut length (10~50mm long).
  • 25
    2024-09
    How to prevent guideway damage of lathe machine?
    We can implement effective measures to prevent damage to the guideway. 1. The machine tool guideway should have sufficient and reasonable lubrication conditions.   Good lubrication conditions to reduce the damage to the guide rail are essential. When the relative movement between the guide surface filled with lubricant, the formation of oil film, the establishment of the liquid friction between the guide surface does not occur direct friction, which occurs between the molecules within the lubricant, which avoids the rail surface of the research loss pull Injury, extend the service life of rails to improve the movement of the rail accuracy.     2. The lathe machine should have reasonable protective measures   To prevent iron filings, abrasive particles, dust, and other impurities into the rail surface, the machine tool rail must have reasonable protection devices. For example, steel plate devices and shields on the rail slide surface end.     3. Enhance the rigidity of the guideway   Increasing the rigidity of the guide rail is the most straightforward way to reduce or avoid injury.   First, we can do hardening on the surface of the guide surface. Second, we can also do steel-plated treatment on the rails. In short, To keep the lathe machine in good condition for a long time, the operator should cooperate closely and do the routine maintenance work of the equipment, keep the lathe machine clean oil regularly, and check it regularly.
  • 18
    2024-09
    CNC Machine Parts Ball Screw MIF1602
    CNC Machine Parts Ball Screw MIF1602 ——16mm diameter ball screw Quick Details Manufacturing Process: Milled ThreadMaterial: Gcr15 / SS440C(9Cr18) Accuracy grade: C3/C5Length: As requestedModel Number: MIF1602Diameter:16mmPitch: 2mm Nut Type: Standard NutSample order: YESSurface treatment: According to your needShaft end: Customized Deflector: Floating DeflectorThe advantages of a floating deflector lie in its ability to achieve automatic docking of the ball return inlet and outlet during high-frequency "floating." This provides a smooth channel for the return of the balls, resulting in better friction characteristics and structural manufacturability.   Specifications   High-quality ball screw super precision MIF16021. ISO 9001:2015 certified2. High precision high performance Packaging & DeliveryPackaging: Wooden box Delivery Detail: According to the required quantity  Application: 1. engraving machines 2. high-speed Machinery of CNC machinery. 3. window machines 4. Semiconductor Equipment 5. high speed machinery We also offer different sizes: 

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No.28 Xinchang Road, Suzhou Industrial Park, Jiangsu Province, China

Telephone

+86 13151467999

Email

hojama@126.com

Mobile

+86 18068430089

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