A new type of roller forming die

Abstract

The present invention provides a new type of roller forming mold, which can produce and process carriers with special pocket structures, large sizes and high precision on the roller forming mold under the premise of ensuring that the pocket forming strength meets the standard. It includes: a mold inner pressure ring, whose inner surface is a planar annular structure; a mold forming ring, which includes a ring body, the radial outer ring surface of the ring body is surrounded by a plurality of inner concave pocket cavities, the plurality of inner concave pocket cavities are arranged along the width center area of ​​the radial outer ring surface, and a spacing strip is left between adjacent inner concave pocket cavities, and the two side surface positions of the ring body corresponding to each of the inner concave pocket cavities are respectively provided with inner concave vacuum air cavities; and a mold outer pressure ring, whose inner surface is a planar annular structure, and the outer surface thereof is surrounded by a plurality of mold mounting holes, and the mold mounting holes are used for connecting with the vacuum ring of the inner ring.

Description

Technical Field

[0001] The invention relates to the technical field of electronic packaging moulds, in particular to a novel roller forming mould. Background Art

[0002] Carrier tape is a strip product used in the field of electronic packaging. It has a specific thickness, and pockets for holding electronic components and positioning holes for indexing are evenly distributed at a certain distance along its length. It is mainly used in the electronic component mounting industry. It is used with a cover tape (upper sealing tape) to carry and store electronic components such as resistors, capacitors, transistors, and diodes in the pockets of the carrier tape, and the cover tape is sealed on top of the carrier tape to form a closed package to protect the electronic components from contamination and damage during transportation. When mounting electronic components, the cover tape is peeled off, and the automatic mounting equipment takes out the components in the pockets one by one through the precise positioning of the index holes of the carrier tape, and places them on the integrated circuit board (PCB board).

[0003] According to the pocket forming method, it can be divided into two types: intermittent (flat plate molding) and continuous (roller rotation). Compared with the intermittent type, the continuous type usually has better dimensional stability and higher product dimensional accuracy. The intermittent type is more suitable for making large-sized pockets.

[0004] The continuous roller mold is usually assembled and combined. It is generally composed of two side rings and a forming ring with several independent vacuum grooves on both sides, which are assembled and combined through several positioning pins. The forming principle is that the two side rings and the forming ring are inserted into the vacuum ring after assembly and combination. The mold together with the vacuum ring is sleeved on the forming mold base and fixed with screws and installed on the forming mold base. When the motor is running, the mold covered with leather rotates with the vacuum ring. The leather is heated by the hot air gun. After softening, it is vacuum adsorbed by the closed vacuum grooves on both sides of the forming ring to form a pocket of a certain shape and size in the pocket cavity on the surface of the mold. This kind of mold is greatly limited by the structure, size and strength of the carrier pocket during leather molding production. Some products with special pocket structures or sizes cannot be realized on continuous molding (roller molding) molds. They need to be developed and produced on intermittent (flat plate pressing mode) molds, but the intermittent (flat plate pressing mode) molding method has poor stability, low precision, and poor appearance at the intersection of each mold of narrow rib carrier products, which cannot be mass-produced. Summary of the invention

[0005] In view of the above problems, the present invention provides a new roller forming mold, which can produce and process carriers with special pocket structures, larger sizes and higher precision on the roller forming mold while ensuring that the pocket forming strength meets the standards.

[0006] A novel roller forming mold, characterized in that it comprises:

[0007] The inner surface of the mold inner pressure ring is a flat annular structure;

[0008] A mold forming ring, comprising a ring body, wherein a plurality of concave pocket cavities are arranged on the radial outer ring surface of the ring body, wherein the plurality of concave pocket cavities are arranged along the width center area of ​​the radial outer ring surface, and a spacing strip is left between adjacent concave pocket cavities, and concave vacuum air cavities are respectively arranged on the two side surface positions of the ring body corresponding to each of the concave pocket cavities, and corresponding vacuum holes are opened at the two end positions of the bottom of the concave pocket cavities, and vacuum channels are respectively opened at the inner end areas of the ring body corresponding to the vacuum holes, and the two ends of the vacuum channels are respectively connected to the concave vacuum cavities at the corresponding surface positions; a corresponding concave vacuum channel is arranged on the radial inner ring surface of the ring body corresponding to each of the concave pocket cavities, and the concave vacuum channel penetrates the width direction area of ​​the corresponding inner ring wall of the ring body, and is respectively connected to the concave vacuum cavities at the corresponding surface positions, and at least one suction edge groove is also respectively arranged on the radial outer ends of the inner surfaces on both sides of the ring body corresponding to each of the concave pocket cavities, and the radial outer ends of the suction edge grooves are connected to the outside, and the radial inner ends of the suction edge grooves are connected to the concave vacuum cavities;

[0009] and a mold outer pressure ring, the inner surface of which is a planar annular structure, and the outer surface of which is provided with a plurality of mold mounting holes, the mold mounting holes being used for being locked and connected with the vacuum ring of the inner ring;

[0010] The inner surface of the mold inner pressure ring is pressed onto the first side surface of the mold forming ring, and the inner surface of the mold outer pressure ring is pressed onto the second side surface of the mold forming ring.

[0011] It is further characterized in that: the mold inner pressure ring is provided with a first mold positioning hole, the ring body is provided with a plurality of second mold positioning holes, the second mold positioning holes are arranged at corresponding positions of the first mold positioning holes, the inner surface of the mold outer pressure ring is provided with a third mold positioning blind hole, and the positioning pin passes through the first mold positioning hole and the second mold positioning hole, and is then fixed to the third mold positioning blind hole;

[0012] The inner concave pocket cavity is specifically an inverted trapezoidal pocket that expands radially from the inside to the outside. The inverted trapezoidal pocket shape facilitates smooth placement and removal of electronic components, and is also conducive to demolding the carrier tape and the mold after the pocket is formed;

[0013] A plurality of vacuum holes are arranged on both sides of the arc direction of the inverted trapezoidal pocket, and adjacent vacuum holes are arranged at equal intervals;

[0014] The concave vacuum channel is a cylindrical channel;

[0015] Each concave pocket cavity is provided with an air suction side groove at both ends of the inner surface of the ring body in the arc direction, and the air suction side groove is used to absorb the edge areas of both sides of the carrier tape to ensure that the overall width of the carrier tape is stable and reliable;

[0016] The pocket ribs of the inner concave pocket cavity are in an arc structure, and the diameter of the arc structure is smaller than the outer diameter of the mold forming surface, so that after the cover tape is sealed, the cover tape will not be affected by the sticky ribs during the peeling process;

[0017] The vacuum channel is specifically a semicircular vacuum channel.

[0018] It abandons the original separate assembly structure of the side ring and the forming ring. The defect of the original mold is that it only relies on the vacuum air groove forming method on the two sides of the forming ring. For carrier products with larger pocket sizes or special pocket structures, the vacuum suction force is uneven and cannot be well formed. In addition, the side strength of the pocket after forming is poor and the pocket is soft. After adopting the present invention, the pressure rings and the forming rings on both sides are designed as an integrated structure, which enhances the mold strength of large pocket narrow rib carrier products and extends the mold life. The bottom of the concave pocket cavity is designed with a number of vacuum holes as vacuum air holes, which is conducive to the more uniform suction force on the bottom of the pocket when the leather is softened by heat and sucked into the cavity for forming, and the forming effect will be better, and the pocket strength after forming will be longer. It is also high and not easy to deform; a number of vacuum air cavities are designed on both sides of the mold forming ring, and the vacuum air cavities are connected to the edge suction air grooves for edge suction during leather forming to ensure that the leather does not shrink or curl when it is heated and formed. The mold inner pressure ring and the mold outer pressure ring can fix the mold forming ring on the vacuum ring and ensure that each vacuum cavity in the forming ring is sealed to ensure vacuum stability. The outer surface connection position of the inner concave pocket cavity of the mold is designed to be a polygonal structure, which is conducive to the stable sealing of large pocket carrier products; on the premise of ensuring that the pocket forming strength meets the standards, it produces and processes carriers with special pocket structures, large sizes and high precision on the roller forming mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereogram of the present invention in a combined state;

[0020] Figure 2 It is a three-dimensional exploded view of the present invention;

[0021] Figure 3 for Figure 2 A local enlarged view of point A;

[0022] Figure 4 A three-dimensional diagram of a carrier tape manufactured using the present invention;

[0023] The names corresponding to the serial numbers in the figure are as follows:

[0024] Mold inner pressure ring 10, first mold positioning hole 11, mold forming ring 20, first side surface 201, second side surface 202, ring body 21, concave pocket cavity 22, arc structure 221, spacer bar 23, concave vacuum air cavity 24, vacuum hole 25, vacuum channel 26, concave vacuum channel 27, suction side groove 28, mold outer pressure ring 30, mold mounting hole 31. DETAILED DESCRIPTION

[0025] A new type of roller forming die, see Figure 1-Figure 3 , which includes a mold inner pressure ring 10, a mold forming ring 20, and a mold outer pressure ring 30;

[0026] The inner surface of the mold inner pressure ring 10 is a planar annular structure; the mold forming ring 2 includes a ring body 21, and the radial outer ring surface of the ring body 21 is annularly provided with a plurality of concave pocket cavities 22, and the plurality of concave pocket cavities 22 are arranged along the width center area of ​​the radial outer ring surface, and a spacing strip 23 is left between adjacent concave pocket cavities 22, and the two side surface positions of the ring body corresponding to each concave pocket cavity 22 are respectively provided with concave vacuum air cavities 24, and the bottom two ends of the concave pocket cavity 22 are provided with corresponding vacuum holes 25, and the inner end areas of the ring body 21 corresponding to the vacuum holes 25 are respectively provided with vacuum channels 26, and the two ends of the vacuum channels 26 are respectively connected to the concave vacuum cavities 24 at the corresponding surface positions; each concave pocket cavity 2 2 is provided with a corresponding concave vacuum channel 27 on the radial inner ring surface of the ring body 21, which penetrates the width direction area of ​​the corresponding inner ring wall of the ring body 21 and is respectively connected to the concave vacuum cavity 24 at the corresponding surface position. The radial outer ends of the inner surfaces of both sides of the ring body 21 corresponding to each concave pocket cavity 22 are also respectively provided with at least one suction side groove 28, the radial outer ends of the suction side groove 28 are connected to the outside, and the radial inner ends of the suction side groove 28 are connected to the concave vacuum cavity 24; the inner surface of the mold outer pressure ring 30 is a plane annular structure, and a plurality of mold mounting holes 31 are arranged on the radial inner end of the outer surface thereof, and the mold mounting holes 31 are used for locking and connecting with the vacuum ring of the inner ring (not shown in the figure, belonging to the existing mature vacuum structure);

[0027] The inner surface of the mold inner pressure ring 10 is pressed onto the first side surface 201 of the mold forming ring 20 , and the inner surface of the mold outer pressure ring 30 is pressed onto the second side surface 202 of the mold forming ring 20 .

[0028] During specific implementation, the mold inner pressure ring 10, the mold forming ring 20, and the mold outer pressure ring 30 are fixedly connected by a positioning pin combination: at this time, the mold inner pressure ring 10 is annularly provided with a first mold positioning hole 11, and the ring body 21 is annularly provided with a plurality of second mold positioning holes, and the second mold positioning holes are arranged at corresponding positions of the first mold positioning holes 11. Specifically, each second mold positioning hole penetrates the ring body 21 corresponding to the concave vacuum cavity 24 at the corresponding circumferential position, and the number of the second mold positioning holes is four evenly distributed; the inner surface of the mold outer pressure ring 30 is annularly provided with a third mold positioning blind hole (obstructed in the figure, belonging to an existing mature concave blind threaded hole), and the positioning pin penetrates the first mold positioning hole 11, the second mold positioning hole, and is then fixed to the third mold positioning blind hole;

[0029] The radial inner end of the mold outer pressure ring 30 is provided with six mold mounting holes 31 penetrating in the thickness direction. The radial inner end of the mold outer pressure ring 30 is arranged to protrude inwardly from the inner ring wall of the mold forming ring 20.

[0030] The inner concave pocket cavity 22 is specifically an inverted trapezoidal pocket that expands radially from the inside to the outside. The inverted trapezoidal pocket shape facilitates smooth placement and removal of electronic components, and is also conducive to demolding the carrier tape from the mold after the pocket is formed;

[0031] A plurality of vacuum holes 25 are arranged on both sides of the arc direction of the inverted trapezoidal pocket, and adjacent vacuum holes 25 are arranged at equal intervals. The aperture of the vacuum holes is 0.2 mm.

[0032] The concave vacuum channel 27 is a cylindrical channel;

[0033] Each concave pocket cavity 22 has an air suction groove 28 at both ends of the inner surface of the ring body in the arc direction. The air suction groove 28 is used to absorb the edge areas of the two sides of the carrier tape to ensure that the overall width of the carrier tape is stable and reliable.

[0034] The pocket ribs of the inner concave pocket cavity 22 are arc structures 221, and the diameter of the arc structures 221 is smaller than the outer diameter of the mold forming surface, so that after the cover tape is sealed, the cover tape will not be affected by the sticky ribs during the peeling process;

[0035] The vacuum channel 26 is specifically a semicircular vacuum channel.

[0036] Its working principle is as follows: the mold inner pressure ring, mold forming ring and mold outer pressure ring are assembled together through the corresponding positioning pins of the second mold positioning hole. After heating to a certain temperature, the whole set of molds are nested on the vacuum ring using the principle of thermal expansion and contraction. The mold is fastened to the vacuum ring with screws through the mold mounting hole. The mold and vacuum ring are installed together on the mold base of the equipment for use. After the forming mold installed on the equipment is heated to a certain temperature by the hot air gun provided by the equipment, the mold temperature is maintained; the leather is covered on the forming surface of the mold. Driven by the motor, the leather moves with the rotation of the mold. When it moves to the position corresponding to the vacuum groove of the mold base, the vacuum is connected to the vacuum air cavities on both sides of the mold forming ring through the vacuum flow channel, and the edge suction air groove is connected to each other through the vacuum channel, the concave vacuum cavity and the vacuum holes in the concave pocket cavity. The leather has a certain fluidity after being heated and softened by the hot air gun. Under the action of vacuum, the softened leather is adsorbed and flows to the side walls of the concave pocket cavity to form a cavity structure consistent with the concave pocket cavity. As the mold continues to rotate, the leather separates from the mold after cooling to form a carrier with a certain shape and strength.

[0037] The pressure rings and forming rings on both sides are designed as an integrated structure, which enhances the mold strength of the large-pocket narrow-rib carrier product and extends the mold life; the bottom of the concave pocket cavity is designed with a number of small vacuum holes as vacuum air holes, which is conducive to more uniform suction at the bottom of the pocket when the leather is softened by heat and sucked into the cavity for forming, and the forming effect will be better. In addition, the pocket strength after forming is also high and not easy to deform; a number of vacuum air cavities are designed on both sides of the mold forming ring, and the vacuum air cavities are connected to the edge suction air groove for edge suction during leather forming to ensure that the leather does not shrink or curl when it is heated and formed. The inner pressure ring and the outer pressure ring of the mold can fix the mold forming ring on the vacuum ring and ensure that each vacuum cavity in the forming ring is sealed to ensure vacuum stability. The outer surface connection position of the inner concave pocket cavity of the mold is designed to be a polygonal structure, which is conducive to the sealing stability of the large-pocket carrier product; on the premise of ensuring that the pocket forming strength meets the standard, it produces and processes carriers with special pocket structure, large size and high precision on the roller forming mold.

[0038] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0039] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A new roller forming mold, characterized in that: It includes: The inner surface of the mold inner pressure ring is a flat annular structure; A mold forming ring, comprising a ring body, wherein a plurality of concave pocket cavities are arranged on the radial outer ring surface of the ring body, wherein the plurality of concave pocket cavities are arranged along the width center area of ​​the radial outer ring surface, and a spacing strip is left between adjacent concave pocket cavities, and concave vacuum air cavities are respectively arranged on the two side surface positions of the ring body corresponding to each of the concave pocket cavities, and corresponding vacuum holes are opened at the two end positions of the bottom of the concave pocket cavities, and vacuum channels are respectively opened at the inner end areas of the ring body corresponding to the vacuum holes, and the two ends of the vacuum channels are respectively connected to the concave vacuum cavities at the corresponding surface positions; a corresponding concave vacuum channel is arranged on the radial inner ring surface of the ring body corresponding to each of the concave pocket cavities, and the concave vacuum channel penetrates the width direction area of ​​the corresponding inner ring wall of the ring body, and is respectively connected to the concave vacuum cavities at the corresponding surface positions, and at least one suction edge groove is also respectively arranged on the radial outer ends of the inner surfaces on both sides of the ring body corresponding to each of the concave pocket cavities, and the radial outer ends of the suction edge grooves are connected to the outside, and the radial inner ends of the suction edge grooves are connected to the concave vacuum cavities; and a mold outer pressure ring, the inner surface of which is a planar annular structure, and the outer surface of which is provided with a plurality of mold mounting holes, the mold mounting holes being used for being connected with the vacuum ring of the inner ring by locking; The inner surface of the mold inner pressure ring is pressed onto the first side surface of the mold forming ring, and the inner surface of the mold outer pressure ring is pressed onto the second side surface of the mold forming ring.

2. A novel roller forming mold as claimed in claim 1, characterized in that: The mold inner pressure ring is provided with first mold positioning holes, the ring body is provided with a plurality of second mold positioning holes, the second mold positioning holes are arranged at corresponding positions of the first mold positioning holes, the inner surface of the mold outer pressure ring is provided with third mold positioning blind holes, and the positioning pins penetrate the first mold positioning holes and the second mold positioning holes and are then fixed to the third mold positioning blind holes.

3. A novel roller forming mold as claimed in claim 2, characterized in that: The inner concave pocket cavity is specifically an inverted trapezoidal pocket that expands radially from the inside to the outside.

4. A new roller forming mold as claimed in claim 3, characterized in that: A plurality of vacuum holes are arranged on both sides of the arc direction of the inverted trapezoidal pocket, and adjacent vacuum holes are arranged at equal intervals.

5. A novel roller forming mold as claimed in claim 1, characterized in that: The concave vacuum channel is a cylindrical channel.

6. A novel roller forming mold as claimed in claim 4, characterized in that: An air suction side groove is respectively arranged at both ends of the inner surface of both sides of the ring body corresponding to each inner concave pocket cavity in the arc direction, and the air suction side groove is used to absorb the edge areas of both sides of the carrier tape.

7. A novel roller forming mold as claimed in claim 1, characterized in that: The pocket rib portion of the inner concave pocket cavity is an arc structure, and the diameter of the arc structure is smaller than the outer diameter of the mold forming surface.

8. A novel roller forming mold as claimed in claim 1, characterized in that: The vacuum channel is specifically a semicircular vacuum channel.

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