Mini Parafuso Esférico Tipo SFK Série

Principais Parâmetros Técnicos e Projeto
Fabricação de precisão: A retificação da pista do eixo do parafuso esférico, o processamento da porca e a montagem de pequenas esferas de aço (com diâmetros possivelmente inferiores a 1 mm) requerem precisão de fabricação extremamente alta.
Inovação estrutural: pode empregar circulação de tampa final ou recirculadores em miniatura especiais para acomodar o espaço interno extremamente pequeno.
Materiais e tratamento térmico: Ligas de aço de alta resistência são frequentemente usadas e submetidas a tratamento térmico especial para garantir resistência e resistência ao desgaste suficientes em tamanhos miniatura.
Precisão e desempenho: disponível em graus de precisão C5, C7 e até mais altos. Devido ao seu cabo extremamente pequeno, muitas vezes ele pode atingir controle de deslocamento de precisão submicrométrico.
Especificações e seleção: oferece diâmetros de eixo extremamente pequenos de φ3 mm a φ10 mm, com cabos normalmente de 0,5 mm, 1 mm, 2 mm, etc. Os usuários precisam calcular cuidadosamente a carga, a velocidade e a vida útil.

Aplicações
O parafuso esférico da série Mini tipo SFK é a fonte de energia ideal para os seguintes equipamentos de ponta miniaturizados e leves:
Microautomação e Robótica: Braços microrobóticos de mesa, plataformas de micromovimento em equipamentos de embalagem de chips, acionamentos conjuntos para microrobôs biônicos.
Óptica e Instrumentos de Precisão: Equipamentos de alinhamento de fibra óptica, eixos de microajuste para máquinas de gravação a laser, mecanismos de focagem automática para microscópios.
Equipamentos médicos e laboratoriais: manipuladores de células, sequenciadores de genes, mecanismos de alimentação de precisão para chips microfluídicos, efetores finais finos para robôs cirúrgicos.
Produtos de consumo e modelos de ponta: elevação de bico de impressora 3D de alta precisão, controles deslizantes de câmera profissionais, controle de leme para modelos de aeronaves de ponta.

O parafuso esférico da série Mini tipo SFK é um excelente representante do avanço da engenharia de precisão no domínio microscópico. Ele quebra as limitações de "transmissão eficiente e precisa, sendo difícil de ser alcançada em espaços pequenos", condensando a essência da tecnologia de parafusos de esferas em um design compacto. Escolher a série SFK significa equipar seus produtos inovadores miniaturizados com componentes de movimento central de nível profissional e altamente confiáveis, o que é fundamental para criar competitividade diferenciada e uma experiência de produto superior.

_Parâmetros

_Desenhos

_{Suporta seleção de combinação de produtos}

_{Production Capacity}

Cyclone Milling Machines LWN160-6000mm Leistritz Cyclone milling machines imported directly from Germany, the ball screw shaft precision can be C3, C5, and C7 the max length can be 7000mm

Rolled Thread CNC Machines ST-20.2 and ST-347.7 rolled thread ball screw machines from TaiWan. The ball screw shaft precision can be C7 - C10

Ball Screw Assembly Workshop We conduct nut assembly in a constant temperature workshop,  all workers having decades of work experience and zero clearance between the screw and nut.

Ball Screw Assembly Workshop One ball screw shaft matches one ball screw nut. Because each ball screw shaft has a very tiny different tolerance. There are dozens of different ball sizes for different screw shaft. Our ball screw shaft and nut can be interchanged with the Taiwan TBI ball screw shaft and nut very well.

_{Model Code Explanation} 

_{Design Accuracy}

1-1-1 Lead/Travel Accuracy

According to the standard of JIS,we classified our lead accuracy through E,e,e3oo and e2m four main regulations.As figure 1.1.1～1.1.3 shown in below, all the definition and tolerance are specified.To test the accumulated travel deviations for grade C7 and C10, the tolerance wll be chosen in random 30omm of useful length and evaluated if it is qualified with the e300 table of 1.1.3.

Fig 1.1.1 Diagram of Lead Accuracy

Terms	Reference	Definition	Allowable
Travel Compensation	T	Travel compensation is the deduction between specified and nominal travel in the useful travel. A slightly smaller value compared with nominal travel is often selected by customer, to compensate for an expected elongation caused by temperature rise or external load. Therefore"T "” is usually a negative value. Note:if no compensation is needed,specified travel is the same as nominal travel.	Table 1.1.2
Actual Travel		Actual travel is the axial displacement of the nut relative to the screw shaft.
Mean Travel		Mean travelis the linear best fit line of actual. This could be obtained by the leastsquares method. This line represents the tendency of actual travel.
Mean Travel Deviation	E	Mean travel deviation is the deduction between mean travel and specified travel within travel length.
Travel Variations	e	Travel variations is the coverage of 2 lines drawn parallel to the mean travel. Maximum width of variation within the travel length. Actual width of variation for the length of 300mm taken anywhere within the travel length. Wobble error, actual width of variation for one revolution (2πt radian)	Table 1.1.2 Table 1.1.3 Table 1.1.3

Table 1.1.2 Mean Travel Deviation (±E) and Travel Variation (e) (JIS B 1192)

Table 1.1.3 International standard of accuracy grade for ball screw

Grade	C0	C1	C2	C3	C5	C7	C10
	3.5	5	7	8	18	50	210
	2.5	4	5	6	8

1-1-2 Axial Play

Axial play of WANGONG's precision ball screw is shown below:

Table 1.1.4 Classification of Axial Play

Excessive preload increases the friction torque and generates heat which wll reduce the life expectancy. However, insufficient preload will reduce stifness and increase the possibility of lost motion. WANGONG recommends that the preload applied on CNC machine tools should not heavier than 8% of the dynamic load; 5% for industrial automation X-Y table.

Table 1.1.5 The reference spring force of (P2)

Table 1.1.6 Axial Play (Po) Clearance in the Axial Direction of Rolled and Grind Ball Screw

1-1-3 Definition of Mounting Accuracy and Tolerance on Ball Screw

The main items of the mounting accuracy of ball screw are listed in below.
(1) Periphery run-out of the supporting part of the screw shaft to the screw groove.
(2) Concentricity of a mounting portion of the shaft to the adjacent ground portion of the screw shaft.
(3) Perpendicularity of the shoulders to the adjacent ground portion of tha screw shaft.
(4) Perpendicularity of the nut flange to the axis of the screw shaft.
(5) Concentricity of the ball nut diameter to the screw groove.
(6) Parallelism of the mounting surface of a ball nut to the screw groove.
(7) Total run-out of the screw shaft to the axis of the screw shaft.
All WANGONG ball screws are manufactured, inspected and guaranteed to be within specifications.

Fig 1.1.2 Mounting Accuracy and Tolerance

1-1-4 Preload Torque
As figure 1.1.3 shown in below, it specified allthe type of preload torque generated by rotating a preloaded ball screw.

Fig 1.1.3 Descriptions of preload torque

Glossary

1. Preload
To generate the inner force inside the ball screw to decrease the
clearance and increase the rigidity, a set of one gage ( approximately 2μ) larger steel balls is filled inside the nut or two nuts which are executing mutual displacement in axial direction.
2. Preload dynamic torque
The dynamic torque required for continuously rotating the screws shaft or the nuts under unload condition and the preload has applied to the ballscrews.
3. Reference torque
The targeted preload dynamic torque Fig 1.1.3-(1)
4. Torque variation values
The variation values of the targeted preload torque variation rates are specified.Take a positive or negative value relative to the reference torque.
5. Torque variation rate
The variation ratio of reference torque.
6. Actual torque
The actual measured preload dynamic torque of the ball screws.
7. Average actual torque
The arithmetic average of the maximal and minimal actual
torque values measured when the nuts are doing reciprocating
movements.
8. Actual torque variation values
After the nut doing reciprocating movements on the effective
length of the thread, the biggest variation tested will be the actual
torque variation value, which is covered between the positive and negative minimum value relative to the actual torque.
9. Actual torque variation rate
The rate of actual torque variation values in relation of the average
actual torque.

Table 1.1.7 Permissible ranges of toque variation rates

Remarks: 1. Slenderness is the value of dividing the screws shaft outside diameter with the screws shaft threading length.