CN214956792U - Strip product reflow oven carrier - Google Patents
Strip product reflow oven carrier Download PDFInfo
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- CN214956792U CN214956792U CN202120821808.1U CN202120821808U CN214956792U CN 214956792 U CN214956792 U CN 214956792U CN 202120821808 U CN202120821808 U CN 202120821808U CN 214956792 U CN214956792 U CN 214956792U
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- carrier
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Abstract
The utility model discloses a strip product reflow oven carrier, which comprises a carrier base (3), wherein a product frame material strip (5) is placed on the carrier base (3) and then covered by a carrier pressing plate (4); a plurality of base grooves (6) are uniformly distributed on the carrier base (3), and two side edges of the carrier base (3) are provided with bottom plate positioning copper sleeves (7); the carrier pressing plate (4) is provided with a plurality of contact areas (8) with the same number as the base grooves (6), and the two side edges of the carrier pressing plate (4) are provided with pressing plate positioning pins (9). The utility model discloses effectively make the product temperature be heated evenly, improve QFN frame material strip angularity requirement, and can avoid product surface scratch.
Description
Technical Field
The utility model relates to a reflow oven carrier specifically is strip product reflow oven carrier.
Background
In the process of the reflow oven, the material strips are directly placed on the surface of the tray aiming at the prior design of the QFN frame product, and when the material strips change along with the temperature in the reflow oven. As shown in FIG. 1, the frame material strips of the QFN products are laid on the carrier base of the reflow oven at present, the frame material strips are not restricted in any direction on the carrier, irregular deformation and warpage are easily generated due to thermal expansion and cold contraction, and the warpage is more than 4mm and exceeds the process specification by 2 mm.
When the whole strip of product passes through a high-temperature reflow oven after QFN plastic package, the temperature is increased from the room temperature to 260 ℃, and then is reduced from 260 ℃ to the room temperature; the temperature change causes the strip frame to generate strip warping of different degrees of the material strip due to expansion with heat and contraction with cold; when the post process cutting separation, because the piece warp leads to the product at cutting separation in-process piece unevenness, the misalignment appears when processing, and the product size skew exceeds the standard after the cutting separation, influences the product quality. And designing and developing the reflow oven carrier again aiming at the reasons.
Utility model patent specification CN208575351U discloses cross stove carrier, should cross stove carrier and have relative first surface and second surface from top to bottom, the carrier body be formed with the portion of placing that is used for placing the part of waiting to cross the stove on the first surface, the carrier body be formed with first location portion on the first surface, the carrier body the second be formed with on the surface be suitable for with first location portion complex second location portion. The first positioning part is formed into a positioning protrusion, and the second positioning part is formed into a positioning groove. The height of the positioning protrusion is greater than the depth of the positioning groove. However, the grooves and the bumps are only used for positioning when a plurality of carriers are superposed, and the warping degree of the strip QFN product cannot be limited and improved.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a strip product reflow oven carrier, which comprises a carrier base, wherein a product frame material strip is placed on the carrier base, and then a carrier pressing plate is used for pressing the upper surface of the strip product; a plurality of base grooves are uniformly distributed on the carrier base, and a plurality of hollow grooves in the long strip direction are uniformly formed in the bottom of each base groove. Two side edges of the carrier base are provided with base positioning copper sleeves; the carrier pressing plate is provided with a plurality of contact areas with the same number as the grooves of the base, and the two side edges of the carrier pressing plate are provided with pressing plate positioning pins.
The depth of the base groove is consistent with the thickness of the product frame material strip.
A plurality of hollowed-out square lattice grooves are uniformly arranged on the contact area.
The grid grooves and the base grooves are uniformly distributed.
The base positioning copper sleeve is matched with the pressing plate positioning pin.
The utility model discloses the fretwork groove of several rectangular directions in base recess bottom to and the square groove of contact zone several fretwork on the carrier clamp plate effectively make the product temperature be heated evenly, lean on the action of gravity of clamp plate to reach the restraint and improve QFN frame material strip warpage requirement; each strip product is independently placed in the groove of the base, so that the surface scratch caused by mutual friction in the strip taking and placing process can be avoided.
Drawings
Fig. 1 shows a carrier design of a QFN product reflow oven in the background art. In the figure, 1 is a carrier base (product placing plane), and 2 is a peripheral baffle of the carrier base.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a schematic view of the carrier base structure of the present invention.
Fig. 4 is a schematic view of the pressing plate structure of the carrier of the present invention.
In the figure, 3, carrier base, 4, carrier pressure plate, 5, frame material strip, 6, base groove, 7, base positioning copper sleeve, 8, contact area, 9, pressure plate positioning pin, 10, hollowed-out groove and 11, grid groove.
Detailed Description
As shown in fig. 2, the strip product reflow oven carrier includes a carrier base 3, on which a product frame strip 5 is placed and then covered by a carrier platen 4. And the carrier base 3 is used for bearing the QFN product frame material strips 5. And the carrier pressing plate 4 restrains the QFN product frame material strip 5 from deforming and warping due to thermal expansion and cold contraction.
As shown in fig. 3, the seating grooves 6, four seating grooves 6 in total, are uniformly distributed. Each base groove 6 is provided with a frame material strip 5, and the depth of each base groove 6 is consistent with the thickness of the frame material strip 5. A plurality of hollow grooves 10 in the long strip direction are formed in the bottom of the base groove 6, the heating area of a product is increased by the hollow grooves 10, and the temperature of the frame material strips 5 in the reflow furnace can meet the required requirement; the base positioning copper sleeve 7 is used for positioning the carrier pressing plate 4.
As shown in fig. 4, a plurality of hollowed-out grid grooves 11 are formed in the contact area 8 where the carrier pressing plate 4 contacts the frame material strip 5, and the grid grooves 11 are uniformly distributed, so that the heating area of the product is increased, the heat dissipation of the product is uniform, and the temperature of the frame material strip 5 in the reflow oven can meet the required requirements. The press plate positioning pin 9 is accurately positioned with the carrier base 3 when the carrier press plate 4 is conveniently covered.
When the product passes through the reflow oven, the machine automatically puts four products into the base grooves 6 in sequence, and each base groove 6 has one product; each product is relatively unique and independent, and the surface scratches of the products caused by mutual overlapping and mutual friction of the products in the carrying process can be avoided.
The bottom of each base groove 6 is provided with a plurality of hollow grooves 10 in the long strip direction, so that the temperature of the product frame material strips 5 in the reflow oven can reach the required requirement, and the product temperature is heated uniformly.
A plurality of (2 x 7) hollowed-out square grooves 11 are arranged in the contact area between the carrier pressing plate 4 and the frame material strip 5, so that the temperature of the frame material strip 5 in the reflow oven reaches the required requirement, and the temperature of a product is heated uniformly.
The carrier is additionally provided with the carrier pressing plate 4, so that the strip product 5 can be fixed in the groove space of the carrier base 3 under the action of gravity of the carrier, and the strip product is restrained from deforming and warping due to expansion caused by heat and contraction caused by cold in a reflow furnace, and the requirement of improving the warping degree of the QFN frame material strip 5 is met.
Data before and after vehicle improvement were compared as follows:
| item | Degree of warp |
| Before improvement | >4mm |
| After improvement | <2mm |
Claims (5)
1. The strip product reflow oven carrier comprises a carrier base (3), wherein a carrier pressing plate (4) is arranged on the carrier base (3); the method is characterized in that: a base groove (6) is formed in the carrier base (3), and a plurality of hollow grooves (10) in the long strip direction are uniformly formed in the bottom of the base groove (6); two side edges of the carrier base (3) are provided with base positioning copper sleeves (7); the carrier pressing plate (4) is provided with a plurality of contact areas (8) with the same number as the base grooves (6), and pressing plate positioning pins (9) are arranged on two side edges of the carrier pressing plate (4).
2. The strip product reflow oven carrier of claim 1, wherein: the depth of the base groove (6) is consistent with the thickness of the product frame material strip (5).
3. The strip product reflow oven carrier of claim 1, wherein: the contact area (8) is provided with a hollowed-out grid groove (11).
4. The strip product reflow oven carrier of claim 3, wherein: the square lattice grooves (11) and the base grooves (6) are uniformly distributed.
5. The strip product reflow oven carrier of claim 1, wherein: the base positioning copper sleeve (7) is matched with the pressing plate positioning pin (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120821808.1U CN214956792U (en) | 2021-04-21 | 2021-04-21 | Strip product reflow oven carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120821808.1U CN214956792U (en) | 2021-04-21 | 2021-04-21 | Strip product reflow oven carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214956792U true CN214956792U (en) | 2021-11-30 |
Family
ID=79043430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120821808.1U Active CN214956792U (en) | 2021-04-21 | 2021-04-21 | Strip product reflow oven carrier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214956792U (en) |
-
2021
- 2021-04-21 CN CN202120821808.1U patent/CN214956792U/en active Active
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