A roll wheel mark free curing process

Abstract

A kind of roller traceless curing process, including the following steps, copper ring pretreatment, copper ring into mould, batching, pouring, solidification forming, demolding cutting step;The binding force strengthening component used in pouring process includes tight shrinkage and protruding structure, the tight shrinkage strengthens the binding strength between binding force strengthening component and copper ring, the protruding structure is fused into the wheel body during pouring, increases the binding degree of binding force strengthening component and wheel body.By such design, the output roller does not exist the binding line of the roller made by injection molding process, when being installed on some delicate household equipment, the quality and aesthetic degree of equipment can be improved, and the wear resistance is superior, and the service life is long.And with the binding force strengthening site medium, the binding strength between copper ring and binding force strengthening part and the binding force strengthening part and wheel body is indirectly realized to strengthen the binding force between copper ring and wheel body.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of plastic part forming, and particularly relates to a rolling wheel traceless curing process. BACKGROUND

[0002] In the rolling wheel manufacturing field, the traditional injection molding process will have obvious injection molding marks after the rolling wheel is formed, and the rolling wheel with obvious injection molding joint marks is not suitable for some devices with high appearance requirements, such as a sweeping robot, so a rolling wheel traceless curing process needs to be provided to manufacture the rolling wheel with high appearance requirements, but the rolling wheel produced by the traceless curing process has another technical problem, that is, the rolling wheel has insufficient combination between the wheel body and the copper ring, and the thermal expansion coefficients of the wheel body material and the copper ring are different, so that the wheel body is prone to cracking and falling off due to thermal expansion and contraction, and therefore the combination between the wheel body and the copper ring needs to be strengthened. SUMMARY

[0003] The present application aims to provide a rolling wheel traceless curing process to solve the problem that the traditional injection molding process will have obvious injection molding marks after the rolling wheel is formed, affecting the appearance, and the rolling wheel produced by the pouring process has a serious technical problem of poor combination between the poured wheel body and the metal part in the rolling wheel.

[0004] To achieve the above-mentioned purpose, the specific technical scheme of the present application is as follows:

[0005] A rolling wheel traceless curing process, comprising the following steps:

[0006] Step one, copper ring pretreatment;

[0007] Step two, copper ring into the mold: assemble the copper ring into the mold;

[0008] Step three, batching: bake the solid pu material at 70-80 DEG C, add a curing agent, and stir uniformly, then heat the pouring material to 100-110 DEG C;

[0009] Step four, pouring: pour the liquid pouring material into the mold with a temperature of 100-110 DEG C;

[0010] Step five, curing forming: including ① pre-curing, ② pressurizing, ③ curing;

[0011] Step six, demolding and trimming: remove the rolling wheel from the mold, and trim the overflowed part.

[0012] Through such a process, the produced rolling wheel does not have the joint line of the rolling wheel produced by the injection molding process, and when installed on some delicate household devices, the quality and appearance of the device can be improved, and the wear resistance is superior, and the service life is long.

[0013] Preferably, in the step one, the copper ring is pretreated: ① roughening the outer surface of the copper ring, sandblasting the copper ring to make the outer surface of the copper ring rough, increasing the adhesion of the subsequent coating, ② applying a glue layer, applying a glue layer on the outer surface of the copper ring, ③ assembling a rubber part to strengthen the bonding force. Through such steps, the outer surface of the copper ring which needs to be combined with the wheel body is treated, the outer surface of the copper ring is roughened, the adhesion of the glue on the outer surface is stronger, and the rubber part to strengthen the bonding force is sleeved on the outer surface of the copper ring when the glue has not yet solidified. The rubber part to strengthen the bonding force is integrated with the poured wheel body in the subsequent pouring process, thereby strengthening the bonding strength between the wheel body and the copper ring.

[0014] Preferably, in the step three, the weight of the curing agent is equal to (the weight of the main material*0.95*AE*NCO%) / 4202. Wherein AE is the equivalent value of the curing agent, and NCO% is the PU index of the main material.

[0015] Preferably, in the step four, after pouring the liquid pouring material into the mold with a temperature of 100-110°C, high-frequency small-amplitude vibration is applied to the copper ring carrying the liquid pouring material for 20s. When the structure of the rubber ring to strengthen the bonding force is relatively complex, the liquid pouring material may not be able to completely fill the gap in the mold. Through such steps, the high-frequency small-amplitude vibration can not cause the liquid pouring material to shake out of the mold due to the large shaking amplitude, and can also help the liquid pouring material to smoothly fill the gap in the mold.

[0016] Preferably, in the step five, ① pre-solidification, using the residual heat carried by the mold, waiting for 1-2 minutes to make the liquid pouring material in the mold solidify into a semi-solid state, ② pressurization, covering the mold with a mold cover and applying a pressure of 5000N to the mold in the upward and downward directions to completely compact the semi-solid pouring material in the mold, ③ solidification, placing the mold in an environment with a temperature of 100-110°C, maintaining the pressure value between the mold and the mold cover at 5000N, and waiting for 10 minutes to make the pouring material in the mold change from a semi-solid state to a solid state. Through such steps, the residual heat of the mold is used to pre-solidify the liquid pouring material, so that the liquid pouring material changes into a semi-solid state. Then the mold cover is covered, the pouring material is pressurized, and the semi-solid pouring material is pressurized. The semi-solid pouring material can be completely compacted, and the liquid pouring material can be prevented from flowing out of the gap between the mold and the mold cover due to the strong fluidity of the liquid pouring material. After the semi-solid pouring material is pressurized, it can be completely compacted, and the finally solidified wheel body has higher strength.

[0017] The binding force reinforcing component used in step one comprises an integral shrinkage part and a protruding structure, the shrinkage part strengthens the binding strength between the binding force reinforcing component and the copper ring, and the protruding structure is fused into the wheel body during pouring to increase the binding degree between the binding force reinforcing component and the wheel body. Through such a design, the binding force reinforcing component is arranged between the copper ring and the wheel body to indirectly strengthen the binding force between the copper ring and the wheel body by strengthening the binding strength between the copper ring and the binding force reinforcing component and the binding strength between the binding force reinforcing component and the wheel body.

[0018] Preferably, the binding force reinforcing component is a binding force reinforcing rubber ring, the binding force reinforcing rubber ring is sleeved on the outer surface of the copper ring, the inner diameter of the shrinkage part is smaller than the inner diameter of the outer surface of the copper ring when the binding force reinforcing rubber ring is not under stress, the shrinkage part and the copper ring are adhered by the glue layer after the glue layer solidifies, the binding force between the binding force reinforcing rubber ring and the copper ring is increased by the elastic contraction of the shrinkage part, and the protruding structures are uniformly arranged on the surface of the shrinkage part, the protruding structures are fused into the wheel body during pouring, and the protruding structures increase the binding strength between the binding force reinforcing rubber ring and the wheel body.

[0019] Preferably, the protruding structure is any one of a stick shape, an arch bridge type, and a ribbon shape, or a combination of any two or three. Through such a design, the binding force reinforcing degrees and material costs in the axial and radial directions of the protruding structures of different shapes are different, and different protruding structures can be selected according to actual needs.

[0020] Preferably, the included angle between the ribbon-shaped protruding structure and the axis of the shrinkage part is 10°-30°, the two ends of the ribbon-shaped protruding structure are integrally formed with the shrinkage part, and a space for accommodating liquid pouring material is reserved between the middle part of the ribbon-shaped protruding structure and the outer wall of the shrinkage part. Through such a design, the binding force reinforcing effect of the protruding structure is more significant.

[0021] Preferably, the ribbon-shaped protruding structure is twisted around its own central axis, the ribbon-shaped rubber body comprises two twisted end parts, the twisted angle experienced by the two twisted end parts during twisting is 180°-720°, and a spiral limiting surface is formed on the surface of the ribbon-shaped protruding structure after twisting. Through such a design, the spiral limiting surface strengthens the binding force between the wheel body and the binding force reinforcing rubber ring more evenly, and the service life is longer.

[0022] The beneficial effects of the present application are: the produced roller does not have the joint line of the roller made by the injection molding process, when installed on some delicate household equipment, can improve the quality and aesthetics of the equipment, and has superior wear resistance and long service life. And the combination of force strengthening part medium, by strengthening the combination of copper ring and force strengthening part and the combination of force strengthening part and wheel body, indirectly realizes the combination of copper ring and wheel body. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 For the structure diagram of the rod-shaped combination force strengthening rubber ring, copper ring, glue layer and wheel body of the present application;

[0024] Figure 2 For the structure diagram of the mold and mold cover of the present application;

[0025] Figure 3 For the structure diagram of the arch bridge-shaped combination force strengthening rubber ring of the present application;

[0026] Figure 4 For the structure diagram of the ribbon-shaped combination force strengthening rubber ring of the present application;

[0027] Figure 5 For the structure diagram of the horn-shaped combination force strengthening rubber ring of the present application;

[0028] Figure 6 For the structure diagram of the ribbon-shaped combination force strengthening rubber ring of the present application;

[0029] Figure 7 For the structure diagram of the ribbon-shaped combination force strengthening rubber ring of the present application;

[0030] Figure 8 For the structure diagram of the horn-shaped convex structure of the present application;

[0031] Figure 9 For the structure diagram of the roller testing machine used in the test of the present application;

[0032] Figure 10 For the structure diagram of the horn-shaped convex structure of the present application;

[0033] Figure 11 For the structure diagram of the horn-shaped convex structure of the present application;

[0034] Figure 12 For the structure diagram of the horn-shaped convex structure of the present application;

[0035] Marking in the figure: 1, roller; 2, copper ring; 3, glue layer; 4, combination force strengthening rubber ring; 5, mold; 6, mold cover; 7, shrinkage part; 8, convex structure; 9, wheel body; 10, torsion end. DETAILED DESCRIPTION

[0036] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description herein relates to the drawings, which will be described in detail below. In the drawings, like reference numerals refer to like elements throughout. The following exemplary embodiments described are not representative of all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0037] Embodiment 1

[0038] As shown in the figure, a roller traceless curing process, comprising the following steps: Figure 1 Figure 2 Step one, copper ring 2 pretreatment;

[0039] Step two, copper ring 2 into the mold: copper ring 2 is assembled into the mold 5;

[0040] Step three, ingredients: solid pu material is baked at 70-80°C, curing agent is added, and after stirring evenly, the pouring material is heated to 100-110°C;

[0041] Step four, pouring: liquid pouring material is poured into the mold 5 with a temperature of 100-110°C;

[0042] Step five, solidification forming: including ① pre-curing, ② pressurization, ③ curing;

[0043] Step six, demolding and cutting: the roller 1 is demolded from the mold 5, and the overflow part is trimmed.

[0044] In step one, copper ring 2 pretreatment: ① roughen the outer surface of copper ring 2, sandblast copper ring 2 to make the outer surface of copper ring 2 rough, increase the adhesion of the subsequent coating, ② apply glue layer 3, apply glue layer 3 on the outer surface of copper ring 2, ③ assemble the bonding force reinforcing part.

[0045] In step three, the weight of the curing agent is added=(main material weight*0.95*AE*NCO%) / 4202.

[0046] In step four, after pouring the liquid pouring material into the mold 5 with a temperature of 100-110°C, high-frequency small-amplitude vibration is applied to the copper ring 2 carrying the liquid pouring material for 20s.

[0047] In step four, after pouring the liquid pouring material into the mold 5 with a temperature of 100-110°C, high-frequency small-amplitude vibration is applied to the copper ring 2 carrying the liquid pouring material for 20s.

[0048] In step five, 1) pre-curing, using the residual heat of the mold 5, waiting for 1-2 minutes to solidify the liquid casting material in the mold 5 into a semi-solid state, 2) pressurizing, putting the mold cover 6 on the mold cover 6, and applying a pressure of 5000N to the mold 5 in the up-down direction to completely compact the semi-solid casting material in the mold 5, 3) curing, placing the mold 5 in an environment of 100-110°C, maintaining the pressure value between the mold 5 and the mold cover 6 at 5000N, and waiting for 10 minutes to change the casting material in the mold 5 from a semi-solid state to a solid state.

[0049] The implementation process of the above embodiment is as follows: the copper ring 2 is pretreated, the copper ring 2 is first subjected to sand washing treatment to make the outer surface of the copper ring 2 rough, and then a layer of glue layer 3 is applied (the ratio of the materials of the glue layer 3 is as follows: toluene ≤30%, isopropyl alcohol ≤30%, trichloroethylene ≤25%, phenolic resin ≤10%, ethanol ≤10%, phenol ≤5%, and butylene oxide ≤0.9%), when the glue layer 3 is not completely solidified, the combined force reinforcing rubber ring 4 is sleeved, and after the pretreatment of the copper ring 2 is completed, the copper ring 2 is placed in the mold 5. The solid PU is completely baked at a temperature of 70-80°C for 4-6 hours. The mold 5 is placed on a flat bed machine and heated to 100-110°C, a curing agent is selected, and the curing agent is matched with the PU main material according to the formula: curing agent weight=(main material weight*0.95*AE*NCO%) / 4202, wherein AE is the equivalent value of the curing agent, the curing agent can be MOCA (equivalent 133.5), E300 (equivalent 107), or TIPA (equivalent 64). NCO% is the index of the main material PU, the ratio is completed according to the required pouring amount, combined with the formula, and stirred uniformly, the uniformly stirred material is heated to 100-110°C in a microwave oven. The material is poured into the heated mold 5 cavity, and pre-curing is performed for 1-2 minutes. After pre-curing is completed, the mold cover 6 is covered, and the mold 5 is completely compacted by a pressure exceeding 5000N. The product is obtained after curing at a temperature of 100-110°C for 10 minutes, the press and the mold 5 cavity are opened, and the product is trimmed and cleaned.

[0050] In further embodiments, a layer of glue layer 3 can also be applied to the outer surface of the combined force reinforcing part to further strengthen the combined force.

[0051] Embodiment 2

[0052] As shown in Figure 1 A rolling wheel traceless curing process, the combined force reinforcing part includes an integral shrinkage part 7 and a protruding structure 8, the shrinkage part 7 strengthens the combined strength between the combined force reinforcing part and the copper ring 2, and the protruding structure is integrated into the wheel body 9 during pouring to increase the combined degree of the combined force reinforcing part and the wheel body 9.

[0053] The binding force strengthening component is a binding force strengthening rubber ring 4, which is sleeved on the outer surface of the copper ring 2. When the binding force strengthening rubber ring 4 is not under stress, the inner diameter of the tight part 7 is smaller than the inner diameter of the outer surface of the copper ring 2. After the glue layer 3 solidifies, the tight part 7 is adhered to the copper ring 2 by the glue, and at the same time, the tight part 7 increases the binding force between the binding force strengthening rubber ring 4 and the copper ring 2 by elastic contraction. The protruding structures are evenly arranged on the surface of the tight part 7, and the protruding structures 8 are integrated into the wheel body 9 during pouring. The protruding structures increase the binding strength between the binding force strengthening rubber ring 4 and the wheel body 9. The protruding structures are rod-shaped.

[0054] The implementation mode of the above embodiment is that when the copper ring 2 is pretreated, the binding force strengthening rubber ring 4 is sleeved on the copper ring 2. When the binding force strengthening rubber ring 4 is not under external force, the inner diameter of the binding force strengthening rubber ring 4 is smaller than the inner diameter of the outer surface of the copper ring 2. The staff member sleeves the binding force strengthening rubber ring 4 on the copper ring 2 by expanding it. At this time, the binding force strengthening rubber ring 4 is contracted on the copper ring 2 due to its own elastic tendency. In the subsequent pouring step, the protruding structures are locked by the solidification of the pouring material, thereby strengthening the binding strength between the binding force strengthening rubber ring 4 and the wheel body 9. Moreover, the thickness of the binding force strengthening rubber ring 4 in the axial direction is lower than that of the wheel body 9. After the wheel body 9 is poured, solidified and formed, the binding force strengthening rubber ring 4 is hidden inside the wheel body 9, and does not affect the appearance of the roller 1.

[0055] Embodiment 3

[0056] The protruding structures 8 are any one of rod-shaped, arch bridge-shaped and ribbon-shaped, or a combination of any two or three.

[0057] The included angle between the ribbon-shaped protruding structure 8 and the axis of the tight part 7 is 10°-30°. The two ends of the ribbon-shaped protruding structure 8 are integrally formed with the tight part 7. The middle part of the ribbon-shaped protruding structure 8 is reserved with a space for accommodating the filling of liquid pouring material between the outer wall of the tight part 7.

[0058] The ribbon-shaped protruding structure 8 is formed by twisting a strip-shaped rubber body around its own central axis. The strip-shaped rubber body includes two twisted end portions 10, and the twisted angle experienced by the two twisted end portions 10 during the twisting process is 180°-720°. After twisting, the surface of the ribbon-shaped protruding structure 8 forms a spiral limiting surface.

[0059] As Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7As shown, the convex structure 8 includes, stick-shaped, arch-shaped, horn-shaped, and ribbon-shaped, wherein the ribbon-shaped is divided into ribbon one-shaped, ribbon two-shaped, and ribbon three-shaped. The convex structure 8 of the ribbon one-shaped is vertically combined with the constricted part 7, and the combined surface is the narrow side of the twisted end part 10. The convex structure 8 of the ribbon two-shaped is obliquely combined with the constricted part 7, and the combined surface is the wide side of the twisted end part 10. The convex structure 8 of the ribbon three-shaped is a 360° twisted ribbon based on the ribbon two-shaped. The above-mentioned convex structure 8 has differences in axial and radial combined strength and material cost. The radial and axial combined force of the above-mentioned convex structure 8 is analyzed from three data, ① whether there is a gap under the convex structure 8 to accommodate the liquid casting material, which can play a dead effect after the casting material solidifies. ② the effective limiting area of the convex structure 8 in the axial view. ③ the effective limiting area of the convex structure 8 in the radial view. The convex structure that meets condition ① includes arch-shaped, horn-shaped, ribbon two-shaped, and ribbon three-shaped.

[0060] From condition ②, the effective limiting area of various convex structures 8 in the axial direction is as follows Figure 11 As shown

[0061] From condition ③, the effective limiting area of various convex structures 8 in the radial direction is as follows Figure 12 As shown

[0062] From the above conditions, the following table is obtained:

[0063]

[0064] The roller 1 with various convex structures 8 is placed in a roller testing machine to test the service life of the roller 1 with different convex structures.

[0065]

[0066] The data in the above two tables shows that in the actual production of the roller 1, the shape of the combined force reinforcing rubber ring 4 should be selected according to the actual use scene of the roller 1, the thickness of the wheel body 9, the service life requirement of the roller 1, and the expected cost. The main influencing factors of the difference in the axial and radial combined force of the above-mentioned convex structure 8 are the contact area of the convex structure 8 with the wheel body and whether there is a gap under the convex structure 8 to accommodate the casting material. Only when the liquid casting material fills the gap and solidifies, the convex structure 8 can be locked, which greatly strengthens the radial combined force of the combined force reinforcing rubber ring 4 and the wheel body 9.

[0067] It is to be understood that the present application is described by way of example only, and that modifications or alterations can be made to the features and embodiments described without departing from the spirit and scope of the application. In addition, modifications can be made to the features and embodiments described to accommodate specific situations and materials without departing from the spirit and scope of the application. Accordingly, the application is not limited to the specific embodiments disclosed herein, but rather, the scope of the application includes all embodiments falling within the scope of the claims.

Claims

1. A roll-to-roll mark free curing process characterized in that, It comprises the following steps: Step one, copper ring (2) pretreatment; Step two, copper ring (2) into the mold: the copper ring (2) is assembled into the mold (5); Step three, ingredients: solid pu material is baked at 70-80 degrees Celsius, add curing agent, after stirring evenly, the pouring material is heated to 100-110 degrees Celsius; Step four, pouring: the liquid pouring material is poured into the mold (5) with a temperature of 100-110 degrees Celsius; Step five, solidification forming: including ① pre-curing, ② pressurization, ③ curing; Step six, demolding and cutting: the roller (1) is taken out of the mold (5), and the overflow part is trimmed; The binding force reinforcing component used in the step one comprises an integral shrinkage part (7) and a protruding structure (8), the shrinkage part (7) strengthens the binding strength between the binding force reinforcing component and the copper ring (2), and the protruding structure (8) is fused into the wheel body (9) during pouring, thereby increasing the binding degree of the binding force reinforcing component and the wheel body (9); the binding force reinforcing component is a binding force reinforcing rubber ring (4), the binding force reinforcing rubber ring (4) is sleeved on the outer surface of the copper ring (2), the inner diameter of the shrinkage part (7) is smaller than the inner diameter of the outer surface of the copper ring (2) when the binding force reinforcing rubber ring (4) is not stressed, after the glue layer (3) is solidified, the shrinkage part (7) and the copper ring (2) are adhered by the glue layer (3), and the binding force between the binding force reinforcing rubber ring (4) and the copper ring (2) is increased by the elastic contraction of the shrinkage part (7), the protruding structures (8) are evenly arranged on the surface of the shrinkage part (7), the protruding structures (8) are fused into the wheel body (9) during pouring, and the protruding structures (8) increase the binding strength of the binding force reinforcing rubber ring (4) and the wheel body (9).

2. The roll roller mark-free curing process of claim 1, wherein, In the step one, the copper ring (2) is pretreated: ① roughening the outer surface of the copper ring (2), sand washing the copper ring (2) to make the outer surface of the copper ring (2) rough, thereby increasing the adhesion of the subsequent coating, ② applying the glue layer (3) on the outer surface of the copper ring (2), ③ assembling the binding force reinforcing component.

3. The roll roller mark-free curing process of claim 1, wherein, The weight of the curing agent added in the step three is equal to (the weight of the main material * 0.95 * AE * NCO%) / 4202.

4. The roll roller mark-free curing process of claim 1, wherein, In the step four, after the liquid pouring material is poured into the mold (5) with a temperature of 100-110 degrees Celsius, high-frequency small-amplitude vibration is applied to the copper ring (2) carrying the liquid pouring material for 20 seconds.

5. The roll roller mark-free curing process of claim 1, wherein, In the step five, ① pre-curing is performed by using the residual heat of the mold (5), the liquid pouring material in the mold (5) is solidified into a semi-solid state after waiting for 1-2 minutes, ② pressurization, the mold cover (6) is covered on the mold (5), and a pressure of 5000N is applied to the up-down direction of the mold (5) to completely compact the semi-solid pouring material in the mold (5), ③ curing, the mold (5) is placed in an environment with a temperature of 100-110 degrees Celsius, the pressure value between the mold (5) and the mold cover (6) is maintained at 5000N, and the pouring material in the mold (5) is changed from a semi-solid state to a solid state after waiting for 10 minutes.

6. The roll roller mark-free curing process of claim 1, wherein, The convex structure (8) is any one of a stick shape, an arch bridge shape, a ribbon shape, or a combination of any two or three.

7. The roll roller mark-free curing process of claim 6, wherein, The ribbon-shaped convex structure (8) has an angle of 10-30° with the axis of the necked portion (7), the two ends of the ribbon-shaped convex structure (8) are integrally formed with the necked portion (7), and a space for accommodating liquid pouring material is reserved between the middle part of the ribbon-shaped convex structure (8) and the outer wall of the necked portion (7).

8. The roll roller mark-free curing process of claim 7, wherein, The ribbon-shaped convex structure (8) is formed by twisting a strip-shaped rubber body around its own central axis, the strip-shaped rubber body comprises two twisted end portions (10), and the two twisted end portions (10) experience a twisting angle of 180-720° during the twisting process; the ribbon-shaped convex structure (8) forms a spiral limiting surface on the twisted surface.

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