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CN-121989404-A - Foaming forming die for polyurethane polishing pad and application method of foaming forming die

CN121989404ACN 121989404 ACN121989404 ACN 121989404ACN-121989404-A

Abstract

The invention relates to the field of foaming dies and discloses a foaming forming die for a polyurethane polishing pad and a using method thereof, wherein the foaming forming die comprises a base, the upper end of the base is provided with a mounting block, the upper end of the mounting block is provided with an upper cover, the upper cover is connected with the base through a bracket component, the bracket component is arranged at the upper end of the base, the middle part of the base is provided with a die component, and the periphery of the die component is provided with a collecting tank; the bottom film is driven to incline and rotate, so that the raw materials are naturally leveled under the condition of no mechanical contact, residual pollution is avoided, and meanwhile, overflow materials generated by abnormal foaming can be automatically identified and cut off during mold opening by means of the cooperation of overflow holes on the movable ring and the fixed scraping plate, so that the utilization rate of the raw materials, the uniformity of finished products and the debugging reliability are improved.

Inventors

  • HU HUA
  • HUANG LINZHI
  • XU XINWEI
  • GUO JINZI
  • HU SHIYUE
  • Huang Lening

Assignees

  • 丽水志晟新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260205

Claims (10)

  1. 1. The foaming and forming die for the polyurethane polishing pad comprises a base (1) and is characterized in that an installation block (2) is arranged at the upper end of the base (1), an upper cover (3) is arranged at the upper end of the installation block (2), the upper cover (3) is connected with the base (1) through a bracket component (6), the bracket component (6) is arranged at the upper end of the base (1), a die component (4) is arranged in the middle of the base (1), and collecting grooves (5) are formed in the periphery of the die component (4); The die assembly (4) comprises a movable ring (401), a plurality of overflow holes (402) are formed in the periphery of the upper end of the movable ring (401), a jack post (403) is fixedly arranged at two ends of the movable ring (401), a bottom film (404) is arranged at the lower end of the movable ring (401), a universal joint (7) is arranged at the lower end of the bottom film (404), and the universal joint (7) is in sliding connection with the base (1).
  2. 2. The foaming and molding die for polyurethane polishing pads according to claim 1, wherein the movable ring (401) is driven by jacking columns (403) at two ends, the movable ring (401) moves upwards when the upper cover (3) is opened, the movable ring (401) sinks when the upper cover (3) is closed, the jacking columns (403) are pushed by a support assembly (6), and the lower end of the movable ring (401) is coupled with the upper end of a bottom film (404) and sealed.
  3. 3. The polyurethane polishing pad foaming forming die according to claim 1, wherein the bottom film (404) is located in the mounting groove (101), the mounting groove (101) is formed in the middle of the upper end of the base (1), the bottom film (404) is slidably connected with the mounting groove (101), the bottom film (404) is fixedly connected with the universal joint (7), the universal joint (7) can jack up the bottom film (404) upwards, after the universal joint (7) moves upwards, the steering joint of the universal joint (7) is away from the base (1), so that the bottom film (404) can incline to any side, the universal joint (7) can drive the bottom film (404) to rotate, and a rubber pad for buffering and increasing friction force is arranged on the lower end face of the universal joint (7).
  4. 4. The polyurethane polishing pad foaming and forming die according to claim 1, wherein the collecting tank (5) is slidably connected with the movable ring (401), a scraping plate (501) is fixedly arranged on the inner side of the collecting tank (5), the scraping plate (501) is specifically an annular blade, the lower end of the blade is connected with the lower end of the collecting tank (5) through a plurality of connecting columns, the blade and the connecting columns form the inner wall of the collecting tank (5), and the heights of the outer wall and the inner wall of the movable ring (401) are consistent.
  5. 5. A foaming and molding mold for polyurethane polishing pad as set forth in claim 4, wherein the length of the blade in the scraper plate (501) is half the depth of the overflow hole (402), and the lower end plane of the movable ring (401) exceeds the lower edge of the blade in the scraper plate (501) after the overflow hole (402) moves up along with the movable ring (401), thereby generating shearing force.
  6. 6. The foaming and molding die for the polyurethane polishing pad of claim 1, wherein the upper cover (3) seals the upper end of the movable ring (401) after being closed, and the upper cover (3) seals the movable ring (401) and simultaneously the protrusion at the lower end of the upper cover can seal the upper half part of the overflow hole (402).
  7. 7. The polyurethane polishing pad foaming and forming die according to claim 1 is characterized in that the base (1) is fixedly connected with the mounting block (2) through a positioning hole and a bolt, the collecting groove (5) is rotatably connected with the mounting block (2), and one end, close to the bracket assembly (6), of the upper cover (3) is arc-shaped.
  8. 8. The foaming and molding die for the polyurethane polishing pad of claim 1, wherein the bracket assembly (6) comprises a rotating plate (601), only one end of the rotating plate (601) is rotatably connected to the upper end of the base (1), the other end of the rotating plate (601) is rotatably provided with a connecting column (602), the upper end of the connecting column (602) is connected with the upper cover (3), and the connecting column (602) penetrates through the mounting block (2) and is slidably connected with the mounting block (2).
  9. 9. The foaming and molding die for the polyurethane polishing pad of claim 8, wherein the middle part of the rotating plate (601) is located right below the jacking column (403), the jacking column (403) can be jacked up by the aid of the rotating plate (601) after the rotating plate rotates around the part connected with the base (1), two support assemblies (6) are symmetrically arranged along the central line of the base (1), and the universal joints (7) are limited by the base (1) and can only move up and down along a straight line in a vertical space.
  10. 10. A polyurethane polishing pad foam molding die as set forth in claim 1, wherein the method for using the polyurethane polishing pad foam molding die as set forth in any one of claims 1 to 9 comprises the steps of: S1, before raw materials are pumped in, firstly, an upper cover (3) is opened, in the process of opening the upper cover (3), the upper cover (3) can play a role of a crowbar to lift a connecting column (602), and as an upper transfer plate (601) of the connecting column (602) is pulled upwards, a movable ring (401) can be pushed upwards by a jacking column (403) in a proper manner, at the moment, the movable ring (401) is separated from a bottom film (404), and then raw materials can be pumped in the bottom film (404); S2, when the raw materials are pumped, an external driving source can be used for pushing the lower end of the universal joint (7) to drive the bottom film (404) to rotate, so that the fluidity of the raw materials in the bottom film (404) is enhanced, the raw materials are forced to be paved on the whole bottom film (404), and uneven raw materials caused by discontinuous wetting are avoided; s3, after the raw materials are pumped in, the external driving source is moved upwards, the universal joint (7) and the bottom film (404) are jacked up, at the moment, the bottom film (404) can incline to any side in a homeotropic manner, at the moment, the bottom film (404) continues to rotate, the fluidity of the raw materials is further enhanced, and after rotating for a plurality of weeks, the bottom film (404) is put down; it is worth mentioning that if excess raw material is pumped, the excess raw material flows into the collecting tank (5) from the gap between the bottom film (404) and the movable ring (401); After the steps are finished, the upper cover (3) is closed, at the moment, the movable ring (401) moves downwards in a proper direction, at the moment, the movable ring (401) and the bottom film (404) are closed, and then foaming can be started; when foaming, the foam is prepared by: s4, if foaming is good, the upper end of the polishing pad enters the overflow hole (402), but the part entering the overflow hole (402) is few, and the polishing pad is removed during deburring; s5, if the bubbles in the raw materials are relatively dense and lower than a normal value, the foamed polishing pad cannot enter the overflow hole (402) at all; S6, if bubbles are too large due to too much gas in the raw materials, the raw materials with the same quantity flow out from the overflow holes (402) and enter the range of the scraping plate (501) after foaming, and the overflowing part can be cut off by the scraping plate (501) when the movable ring (401) moves upwards after the upper cover (3) is opened, so that workers can directly know that the polishing pad is a defective product; it is worth mentioning that during foaming, the excess air can enter the collecting tank (5), so that the probability of occurrence of large bubbles inside the polishing pad can be reduced to a certain extent; And S7, after the foaming is finished, opening the upper cover (3), then lifting the polishing pad upwards by the movable ring (401) so as to peel off the polishing pad from the bottom film (404), and then taking out the whole polishing pad by inserting the mechanical claw into the overflow hole (402), or taking out the whole polishing pad by inserting a worker contact tool into the overflow hole (402).

Description

Foaming forming die for polyurethane polishing pad and application method of foaming forming die Technical Field The invention relates to the technical field of foaming molds, in particular to a polyurethane polishing pad foaming molding mold and a use method thereof. Background The invention particularly relates to a foaming forming die suitable for small-batch and customized production and a use method thereof. The small batch production is a core link of polyurethane polishing pad technical innovation, namely, new product iteration, formula optimization and customization requirements are all dependent on the scene to finish early verification, and a forming die of the novel product is required to simultaneously meet four core requirements of controllable cost, flexible operation, convenient debugging and low loss; The production scale batch of the small batch scene is small, and the material injection amount is small, so the industry generally adopts a production mode of manually pumping materials, namely, manually injecting the mixed polyurethane raw materials into a mold through a metering cup or a small manual pump, completing foaming by matching with a basic temperature control device, and manually cleaning the mold after demolding. The prior art has developed basic optimizations for adapting the scenario, such as: In the patent application with the application publication number of CN113524557B, the device comprises an upper die, a lower die, an upper sealing edge, a locking device and a connecting sleeve, wherein the top of the upper die is fixedly connected with an upper top plate, four corners of the top of the upper top plate are all penetrated through and fixedly connected with the connecting device, the bottom of the lower die is fixedly connected with the lower top plate, the top of the lower top plate is fixedly connected with the bottom of the connecting device, the upper sealing edge is fixed at the bottom of the upper die, the bottom of the upper sealing edge is fixedly connected with the locking device, the bottom of the locking device is fixedly connected with a lower sealing edge, and the connecting device comprises the connecting sleeve, and storage grooves are formed in two sides of the inner wall of the connecting sleeve. The clamping device has the advantages that when the upper die and the lower die are assembled, the sliding sleeve and the threaded connecting rod penetrate through the fixed sleeve and are inserted into the connecting sleeve, when the clamping groove on the sliding sleeve moves to a position opposite to the clamping groove, the clamping groove is inserted into the clamping groove under the thrust action of the spring, the upper die and the lower die are connected and pressed through the threaded connecting rod, then the threaded connecting rod can be rotated to finely adjust the bonding degree between the upper die and the lower die, the bonding degree of the edge sealing positions is unified conveniently, edge warping is avoided, edge warping gaps are generated, and gap overflow is prevented. In the prior art including the above patent, the core pain point of small-scale production is not enough to adapt, directly restricts production efficiency and sample quality, and the specific inadequacies are as follows: The manual pump material precision is insufficient, the pre-control lack causes high sample loss, namely, the manual pump material is used, although the input cost on equipment is low, errors are easy to exist, excessive raw materials are easy to overflow a cavity before die assembly, not only are raw materials wasted, but also the subsequent sample molding can be influenced, for example, the patent only relies on sealing and intercepting the overflow in the foaming stage after die assembly, and a pre-control mechanism is not designed before material injection; The existing spreading mode adopts either natural leveling or small-sized scraping plates for stirring, but the mechanical contact between the scraping plates and a cavity is extremely easy to generate residues, the actual proportion of the residual raw materials is changed after the residual raw materials are mixed with new raw materials, impurities are easy to enter, and thus the quality of the finished product is influenced; The mold has low modularization degree and low mold changing and cleaning suitability, wherein the cavity, overflow structure and base of the existing simple mold are designed in an integrated mode, overflow materials and residual raw materials are mixed and stacked in a mold gap, the integrated structure can be cleaned only by disassembling a plurality of parts, and the efficiency is easy to be reduced due to frequent cleaning; The demolding and taking easily damaged samples lack auxiliary design, the quantity of each batch is small in small-batch production, the profit is low, the existing demolding mode relies on manual bare-handed stripping or simple crowbar assistance, th