Slider System Overview:
Due to special requirements of product, demolding direction of its parts is inconsistent with mold opening direction, requiring side parting or core-pulling structures to smoothly eject product.
Structural Classification:
1) Based on position of action, it is divided into movable side sliders, fixed side sliders, and angled ejector mechanisms.
2) Based on power source, it is divided into hydraulic (pneumatic) side slider structures and mechanical side slider structures.
1. Slider Type:

1. Automotive parts forming parts use 4Gr5MoSiV1 (2344 8407) type material, heat treated HRC46～49. OA parts forming parts use 2344 type material, quenched.
2. Slider seat uses 3Cr2Mo (718) type material, pre-hardened to HB280～330.
3. Slider locking block: 3Cr2Mo (P20) type material, pre-hardened to HB280-330.
4. Slider pressure bar: 3Cr2Mo (718) type material, pre-hardened to HB280-330, surface nitrided.
5. Wear-resistant plate: CR12 material, heat treated HRC50-54. Sliding guide bar: CR12 material, heat treated HRC50-55.
6. Inclined guide post: GCr15 (SUJ2) type material, high-frequency quenched HRC58-62. Specific steel material selection depends on product requirements and functions. Customer requirements will be followed.

1. Angle α between inclined guide post and normal direction of slider movement is <25°, and shall not exceed 30°. Angle of locking surface is 2° larger than that of inclined guide post, as shown in Figure 1:
2. Length L of fixed part of inclined guide post is ≥ 1.5D, and its fit is a transition fit with a tolerance of H7/k6.
3. Sliding fit of slider (except for sealing part) is a clearance fit with a tolerance of H8/f7.

 

4. Sealing surface of slider (excluding parting surface) should preferably have a 3° slope. For tunnel sliders, sealing surface should preferably have a 3° slope, as shown in Figure 2.

 

5. Fit between slider pressure plate and fixing groove is a transition fit with a tolerance of H7/k6.
6. Surface roughness Ra of slider mating surface is not greater than 0.8. Surface roughness Ra of non-mating surfaces that are in contact and move relative to each other is not greater than 1.6, and Ra of other surfaces is not greater than 6.3.
7. Clearance between non-mating surfaces of slider is 0.5.
8. Single-sided clearance of wear-resistant plate is 0.05～0.15.
9. All sliding mating surfaces of slider must be treated with wear resistance.
10. Single-sided clearance between inclined guide post and inclined guide post hole of slider is 0.5～1.0, as shown in Figure 1. When diameter of inclined guide post is less than or equal to 20 mm, gap is 0.5 mm; when it is greater than or equal to 25 mm, gap is 1 mm.
11. Both ends of inclined guide post hole of slider are chamfered with a radius (R). For inclined guide post diameters less than 20 mm, it is R1 or R2; for diameters between 20 and 35 mm, it is R3; For diameters greater than 35 mm, it is R4, as shown in Figure 1.
12. When direction of slider movement is not perpendicular to mold opening direction, as shown in Figures 3a and 3b.

 

a) In Figure 3a, γ+β=α≤25°, and maximum should not exceed 30°.
b) In Figure 3b, γ-β=α≤25°, and maximum should not exceed 30°.
c) In Figure 3a, if β≥20°, other core-pulling methods must be used, such as hydraulic cylinder core-pulling, gear rack, double-section slider, and secondary mold opening structures.
13. Slider Guiding
a) Sliding fit length L of slider in guide groove should be greater than width W and height H of slider. As shown in Figure 4:

 

b) When slider height H is high, L ≥ H can be achieved using following methods:
Raise guide boss of slider as shown in Figure 5.
Lower force-bearing point of inclined guide post as shown in Figure 6a. Note that height H when locking block and slider are in contact must be less than guide length L.
Lengthen guide length as shown in Figure 7.

 

c) When slider width W is relatively wide and height H > W, make L ≥ W as follows: Lengthen slider guide length as shown in Figures 6 and 7, and increase guide groove length as shown in Figure 8. Note that inclined guide post hole cannot pass through front support point of slider.

 

d) When slider width W > 180, add a center guide bar. When slider width W > length L, add a center guide bar, and use two inclined guide pillars depending on structure. As shown in Figure 9:
f) When slider width W > length L, two center guides can be added to reduce guide width to A ≤ L, and A ≤ 180, using one inclined guide pillar. When W ≥ 300, use two inclined guide pillars. As shown in Figure 10a:
e) When slider drop is large, use structure shown in Figure 10b.

 

g) When slider height H>60, slider width direction is guided by mold body (patches on both sides of slider), as shown in Figure 11.

 

h) Regarding width and height of slider shoulder, refer to following diagram:

 

14. Structure driving slider movement:
a) Inclined guide pillars are preferred.
b) Another option is a locking block with a T-shaped block. As shown in Figure 12, where a < 25°.

 

c) Thirdly, a hydraulic cylinder.
d) Using a spring to eject the slider (poor reliability, use sparingly).
e) Structure of small slider is shown in Figure 13:

 

15. Sliding Plate Structure
This type of pressure plate is preferred, as shown in Figures 14 and 15.

 

Following are pressure plate dimensions, see Figure 15. For pressure strips less than 50mm in length, no pins are needed.

 

16. Slider Positioning Structure
a) Built-in spring and stop block structure as shown in Figure 16.

When slider is running idle (without products), spring force when slider is pulled out to its final position is 1.5 to 2 times force exerted on slider in that sliding direction.
During mold opening in production, slider moves upwards or diagonally. After slider is pulled out, spring force is 1.5 to 2 times slider's weight.

 

When length of spring extending from guide hole after slider has slid out is greater than 1.5 times spring's outer diameter (1 > 1.5 of spring diameter), a center guide pin is required.
Slider positioning block material: S45C.
b) External spring with safety stop, as shown in Figure 17: Spring force calculation for external spring is same as that for internal spring.

 

Spring stop is made of 45# steel, as required in figure.
Spring safety stop is made of 45# steel, as required in figure.
c) STRACK positioning post, as shown in Figure 18. Top-side slider requires a positioning post and a spring. Spring preload ≥ 2 times slider weight.

 

d) DME standard positioner is shown in Figure 19:

 

17. Safe distance for slider to extend is shown in Figure 20: When slider's rubber surface height H ≤ 200, W = 3. When H > 200, W = 5.

 

18. Calculation of slider locking block and its stiffness is shown in Table 1:

 

Simplified dimensions of locking block are as follows:

 

19. Selection of slanted guide posts is shown in Table 2: (Since product's clamping force on slider is difficult to calculate and standardize, it is simplified as follows)
Table 2 Relationship between slider weight and slanted guide post diameter

 

a) When slider weight is greater than 100Kg, slanted guide post diameter d = 10³√W (mm) (w: slider weight Kg).
b) When slider uses two slanted guide posts, slanted guide post diameter d = 7³√W (mm).
Preferably choose installation method A (refer to AP guide posts in MISUMI standard).
If space is insufficient, consider installation method B (refer to APX, APXS guide posts in MISUMI standard).

 

20. Guide post fixing component conforms to PUNCH standard, and its structure is shown in Figure 21.

21. Basic dimensions of slider wear plate are shown in Figure 22.

 

22. Dimensions of wear-resistant backplate for slider are shown in Figure 22-1.
W30mm and below does not require a wear-resistant plate; thickness is 10mm, and fixing screws are M6 hex screws.

 

1. External inner slider as shown in Figure 23:
2. Slider with internal barb structure as shown in Figure 24:

 

3. External slider forced release structure is shown in Figure 25:

4. Double-section slider is shown in Figure 26:
5. Linked slider is shown in Figure 27:

 

Double-opening internal slider structure is shown in Figure 28:

 

Heat Treatment of Slider
1. If there is a difference in surface hardness compared to fixed and movable inserts, heat treatment is not required.
2. If slider is made of same material as fixed and movable inserts, it must undergo nitriding.
3. If slider has a textured surface, it must be heat treated followed by textured finishing, or textured finishing followed by nitriding.
4. If slider has sharp corners, etc., damage may occur during heat treatment. Customer approval is required; do not heat treat, use spare parts, etc.
5. For pre-hardened steel sliders, after confirming that product shape is unchanged, perform nitriding.
• Fixed Slider
1. Sliding part and limiting part are not shared, must be separate.
2. Adjustment plates must be added to each sliding surface and composite surface.
3. Spring preload must be at least twice weight of slider.
4. Sliding area must maintain at least 1/3 of stroke when mold is open.
5. When there is an insertion surface between set and movable P, L, an additional insertion angle needs to be added to mold base.
6. Snap-fit must undergo heat treatment, leaving a gap (0.2 mm) and adding a radius (R) to the front end.
7. A limit switch should be added at final limit point of mold opening.