Friction liner pressing die

Abstract

The utility model relates to a friction liner pressing die, and belongs to the technical field of dies, the friction liner pressing die comprises an upper die plate, a lower die plate and a lower die located between the upper die plate and the lower die plate, the lower die is in a rectangular frame shape, the lower end of the upper die plate is provided with an upper die located in the lower die, the upper end of the lower die plate is provided with a middle die located in the lower die, and the lower die, the middle die and the upper die jointly define a die cavity; the middle mold is provided with partition plates used for dividing a mold cavity into a plurality of forming cavities, the outer side of the lower mold is sleeved with a protective cover, and a heating assembly used for heating is arranged in the protective cover; a first positioning column is arranged at the lower end of the upper die plate, a first sinking groove is formed in the upper end of the lower die, and a first guide sleeve matched with the first positioning column is arranged in the first sinking groove. The first positioning column and the first positioning sleeve are matched to restrain position deviation easily generated during mold opening and mold closing of the mold.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a friction pad pressing mold. Background Art

[0002] Friction lining is an engineering plastic product, which is a niche product widely used in mine hoisting equipment.

[0003] At present, the friction pads in the prior art are mainly manufactured by hot compression molding process. The friction pad products have the characteristics of large volume, high molding pressure, poor raw material fluidity, etc. during the processing process; and because the materials produced by various raw material manufacturers have different physical and chemical properties, this also leads to different requirements for the positioning device force, mold cavity force, mold assembly structure and heating temperature control rate in the pressing production link. In the specific product application field, users have high requirements for the dimensional accuracy, form and position tolerance, surface quality, and warping deformation of the product, so the mold positioning structure, assembly structure, cavity dimensional accuracy and heating insulation cooling rate are the key factors that determine the quality of the friction pad finished product. Based on the above reasons, due to the frame-type straight-through guide rod guide positioning structure often used in most traditional plastic molds, the guide stroke is too long and the ability to resist lateral torque is insufficient. It cannot fully meet the mechanical requirements of the product during the pressing process and cannot play a precise positioning role. It is easy to cause poor product accuracy, excessive dimensional deviation, flash, lack of material, deformation, black spots and other defects. In severe cases, it may even damage the mold, greatly shortening the service life of the mold. At the same time, there are also drawbacks such as limited mold disassembly and assembly space, which is not conducive to demoulding of finished products and increases the size of the mold. The above problems determine that such products cannot be produced using the positioning methods and mold assembly structures of compression molding and injection molding in the traditional plastics industry; at the same time, due to the large differences in the mechanical properties of the raw materials used by various friction pad manufacturers, there is no universality in mold design and manufacturing technology and it cannot be used as a reference. Utility Model Content

[0004] Aiming at the problems existing in the prior art, the utility model provides a friction pad pressing die.

[0005] The utility model adopts the following technical solution to solve the above technical problems: a friction pad pressing die, comprising an upper die plate, a lower die plate and a lower die between the upper die plate and the lower die plate, the lower die is in a rectangular frame shape, an upper die located in the lower die is arranged at the lower end of the upper die plate, a middle die located in the lower die is arranged at the upper end of the lower die plate, the lower die, the middle die and the upper die together form a die cavity, a partition for dividing the die cavity into a plurality of forming cavities is provided on the middle die, a protective cover is provided on the outer side of the lower die, a heating assembly for heating is provided in the protective cover;

[0006] A first positioning column is arranged at the lower end of the upper mold plate, a first sink groove is arranged at the upper end of the lower mold plate, and a first guide sleeve matched with the first positioning column is arranged in the first sink groove.

[0007] As a preferred solution, a first positioning shaft is provided at the lower end of the first positioning column, and the first positioning shaft can extend into the first guide sleeve and slideably cooperate with the first guide sleeve.

[0008] As a preferred solution, a second positioning column is provided at the upper end of the lower mold plate, a second sink groove is provided at the lower end of the middle mold, and a second guide sleeve cooperating with the second positioning column is provided in the second sink groove.

[0009] As a preferred solution, a second positioning shaft is provided at the lower end of the second positioning column, and the second positioning shaft can extend into the second guide sleeve and slideably cooperate with the second guide sleeve.

[0010] As a preferred solution, the upper end of the partition has a protrusion, and the upper mold is provided with a groove that matches the protrusion.

[0011] As a preferred solution, the partition is in a straight line shape or a cross shape.

[0012] As a preferred solution, the heating assembly includes an electromagnetic heating controller and an electromagnetic induction coil connected to the electromagnetic heating controller, and the electromagnetic induction coil is evenly wound and sleeved on the circumferential outer wall of the lower mold.

[0013] As a preferred solution, a heat insulating layer is provided between the inner side of the protective cover and the electromagnetic induction coil, and the heat insulating layer is made of ceramic.

[0014] As a preferred solution, a discharge through hole is provided on the lower template.

[0015] The beneficial effects of the present application are as follows: 1. The present application restrains the position deviation that is easy to occur when the mold is opened and closed by cooperating with the first positioning column and the first positioning sleeve. When the mold is opened, the first positioning shaft on the first positioning column slides out along the guide of the first positioning sleeve. When the mold is closed, the first positioning shaft is slowly embedded along the inner wall of the first positioning sleeve, thereby limiting the position deviation of the four sides of the front, back, left and right between the movable and fixed molds when opening and closing the mold.

[0016] 2. The present application sets a second positioning column and a second positioning sleeve to prevent the middle mold from moving when the mold is closed, thereby ensuring the quality of the product compression molding.

[0017] 3. The present application has multiple molding cavities, which can mold multiple friction pads at one time, and has high working efficiency.

[0018] 4. This application uses an electromagnetic induction coil evenly wound around the lower mold. The lower mold generates eddy currents in the magnetic field by cutting the magnetic flux lines. The eddy currents cause the carriers and atoms inside the lower mold to collide and rub at high speed to generate heat, thereby uniformly heating the mold and avoiding the local stress caused by uneven temperature that may be caused by traditional heating methods. This reduces the possibility of cracks in the mold due to thermal stress and extends the service life of the mold. In addition, the appropriate mold temperature allows the material to better fill the mold cavity during the molding process, and the crystallization is more uniform, thereby improving the mechanical properties, physical properties and other intrinsic qualities of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a structural schematic diagram of the middle mold of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the first positioning column and the first guide sleeve of the utility model;

[0022] Figure 4 It is a structural schematic diagram of the partition of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the discharge through hole of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the protective cover of the utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the utility model on a four-column hydraulic press;

[0026] Figure 8 for Figure 7 sectional view of .

[0027] Markings in the figure: 1. upper template, 11. first positioning column, 111. first positioning axis, 2. lower template, 21. second positioning column, 211. second positioning axis, 22. unloading hole, 3. lower mold, 31. first guide sleeve, 4. middle mold, 41. partition, 42. second guide sleeve, 43. raised part, 5. upper mold, 6. molding cavity, 7. protective cover, 71. electromagnetic induction coil, 72. thermal insulation layer, 8. four-column hydraulic press, 81. mobile downward pressure platform, 82. lifting hydraulic cylinder. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that in the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] See also Figure 1-8 The embodiment of the utility model provides a friction pad pressing die, comprising an upper die plate 1, a lower die plate 2 and a lower die 3 located between the upper die plate 1 and the lower die plate 2, the lower die 3 is in a rectangular frame shape, the lower end of the upper die plate 1 is provided with an upper die 5 located in the lower die 3, the upper end of the lower die plate 2 is provided with a middle die 4 located in the lower die 3, the lower die 3, the middle die 4, and the upper die 5 together form a die cavity, the middle die 4 is provided with a partition 41 for dividing the die cavity into a plurality of molding cavities 6, the outer side of the lower die 3 is provided with a protective cover 7, and a heating component for heating is provided in the protective cover 7; the lower end of the upper die plate 1 is provided with a first positioning column 11, the upper end of the lower die 3 is provided with a first sink, and the first sink is provided with a first guide sleeve 31 matched with the first positioning column 11. The first guide sleeve 31 is interference fit with the first sink.

[0030] Among them, the upper mold 5 is connected to the upper mold plate 1 by bolts, and the lower mold 3 is connected to the lower mold plate 2 by bolts. There are four first positioning columns 11, and the four first positioning columns 11 are evenly distributed on the upper mold plate 1. The upper mold plate 1 is provided with a first countersunk hole that is interference-fitted with the first positioning column 11. The lower end of the first positioning column 11 is provided with a first positioning shaft 111, and the first positioning column 11 and the first positioning shaft 111 are made as one piece. The outer diameter of the first positioning shaft 111 is smaller than the outer diameter of the first positioning column 11, and the first positioning shaft 111 can extend into the first guide sleeve 31 and slide with the first guide sleeve 31.

[0031] A second positioning column 21 is provided at the upper end of the lower template 2, and the number of the second positioning columns 21 is four, and the four second positioning columns 21 are evenly distributed at the upper end of the lower template 2. A second countersunk hole that is interference-fitted with the second positioning column 21 is provided on the lower template 2. A second countersunk groove is provided at the lower end of the middle mold 4, and a second guide sleeve 42 that is interference-fitted with the second positioning column 21 is provided in the second countersunk groove, and the second guide sleeve 42 is interference-fitted with the second countersunk groove. A second positioning shaft 211 is provided at the lower end of the second positioning column 21, and the second positioning column 21 and the second positioning shaft 211 are made as one piece. The outer diameter of the second positioning shaft 211 is smaller than the outer diameter of the second positioning column 21, and the second positioning shaft 211 can extend into the second guide sleeve 42 and slide with the second guide sleeve 42. It should be noted that the parts not described in detail in this application are all prior art.

[0032] Specifically, the upper end of the partition 41 has a protrusion 43, and the upper mold 5 is provided with a groove that matches the protrusion 43. The middle mold 4 can move up and down in the lower mold 3 along the vertical direction, and the middle mold 4, the partition 41 and the protrusion 43 are made as a whole. The partition 41 is in a straight line shape and divides the mold cavity into two molding cavities 6. A discharge through hole 22 is provided at the center of the bottom of the lower mold plate 2.

[0033] In addition, the heating component includes an electromagnetic heating controller and an electromagnetic induction coil 71 connected to the electromagnetic heating controller. The protective cover 7 can be provided with a temperature sensor, and the electromagnetic induction coil 71 is evenly wound and sleeved on the circumferential outer wall of the lower mold 3. A heat insulation layer 72 is provided between the inner side of the protective cover 7 and the electromagnetic induction coil 71, and the heat insulation layer 72 is made of ceramic. In the present application, the electromagnetic induction coil 71 is evenly wound around the lower mold 3, and the lower mold 3 generates eddy currents inside by cutting the magnetic flux lines in the magnetic field. The eddy currents cause the carriers inside the lower mold 3 to collide and rub with atoms at high speed to generate heat, thereby uniformly heating the mold. The appropriate mold temperature can make the material better fill the molding cavity 6 of the mold during the molding process, and crystallize more evenly, thereby improving the mechanical properties, physical properties and other intrinsic qualities of the product.

[0034] The mold of the present application needs to be installed on a hydraulic press when in use. The embodiment of the present application adopts a four-column hydraulic press, which adopts a four-column universal hydraulic press produced by Hebei Hongkai Heavy Machine Tool Co., Ltd., model Y32-315T. The four-column hydraulic press has a movable pressing platform 81 and a lifting hydraulic cylinder 82. The movable pressing platform 81 can be driven to rise and fall by four pressing hydraulic cylinders. The lower template 2 is fixed to the working platform of the four-column hydraulic press by bolts, and the upper template 1 is fixed to the lower end of the movable pressing platform 81 by bolts. The raw material of the friction pad is introduced into the mold cavity, and the movable pressing platform 81 moves downward, and the upper template 1 moves downward and finally conflicts with the lower mold 3. The upper mold 5 extends into the lower mold 3, and the first positioning shaft 111 is stuck in the first guide sleeve 31, thereby completing the mold closing. When opening the mold, the movable pressing platform 81 drives the upper mold 1 to move upward, and then the piston rod of the lifting hydraulic cylinder 82 extends into the unloading through hole 22, and then pushes the middle mold 4 to move upward to eject the formed friction pad, which is convenient for material removal. The present application may also use a common hydraulic press, and the working principle is the same as above, except that during unloading, a steel pipe may be inserted into the unloading through hole 22 to push out the formed friction pad.

[0035] Of course, the present invention is not limited to the above-described implementations. Several other implementations based on the design concept of the present invention are provided below.

[0036] For example, in other embodiments, different from the above-described embodiments, as shown in FIG. , the partition plate 41 is cross-shaped and divides the mold cavity into four molding cavities 6 .

[0037] For example, in other embodiments, different from the above-described embodiments, the heating component includes a heating wire disposed in the protective cover 7 .

[0038] It should be noted that the above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model fall within the protection scope of the present utility model.

Claims

1. A friction pad pressing die, characterized in that: The invention comprises an upper mold plate (1), a lower mold plate (2) and a lower mold plate (3) located between the upper mold plate (1) and the lower mold plate (2); the lower mold plate (3) is in the shape of a rectangular frame; an upper mold plate (5) located inside the lower mold plate (3) is provided at the lower end of the upper mold plate (1); a middle mold plate (4) located inside the lower mold plate (3) is provided at the upper end of the lower mold plate (2); the lower mold plate (3), the middle mold plate (4) and the upper mold plate (5) together form a mold cavity; the middle mold plate (4) has a partition plate (41) for dividing the mold cavity into a plurality of molding cavities (6); a protective cover (7) is provided on the outer side of the lower mold plate (3); a heating component for heating is provided inside the protective cover (7); A first positioning column (11) is provided at the lower end of the upper mold plate (1), a first recessed groove is provided at the upper end of the lower mold plate (3), and a first guide sleeve (31) cooperating with the first positioning column (11) is provided in the first recessed groove; The upper end of the lower mold plate (2) is provided with a second positioning column (21), the lower end of the middle mold (4) is provided with a second sink groove, and the second sink groove is provided with a second guide sleeve (42) that cooperates with the second positioning column (21); The partition plate (41) has a protruding portion (43) at the upper end, and the upper mold (5) is provided with a groove that matches the protruding portion (43).

2. A friction pad pressing die according to claim 1, characterized in that: A first positioning shaft (111) is provided at the lower end of the first positioning column (11), and the first positioning shaft (111) can extend into the first guide sleeve (31) and slidably cooperate with the first guide sleeve (31).

3. The friction pad pressing die according to claim 1, characterized in that: A second positioning shaft (211) is provided at the lower end of the second positioning column (21), and the second positioning shaft (211) can extend into the second guide sleeve (42) and slidably cooperate with the second guide sleeve (42).

4. The friction pad pressing die according to claim 1, characterized in that: The partition (41) is in a straight line shape or a cross shape.

5. The friction pad pressing die according to claim 1, characterized in that: The heating component comprises an electromagnetic heating controller and an electromagnetic induction coil (71) connected to the electromagnetic heating controller, wherein the electromagnetic induction coil (71) is evenly wound and sleeved on the circumferential outer wall of the lower mold (3).

6. A friction pad pressing die according to claim 5, characterized in that: A heat insulating layer (72) is provided between the inner side of the protective cover (7) and the electromagnetic induction coil (71), and the heat insulating layer (72) is made of ceramic.

7. The friction pad pressing die according to claim 1, characterized in that: The lower template (2) is provided with a discharge through hole (22).

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