Front mold, mold and front mold processing method capable of improving product quality

Abstract

The present invention discloses a front mold capable of improving product quality, comprising a front mold body, wherein the front mold body has a concave cavity, wherein the concave cavity is divided into a first cavity and a second cavity which are interconnected and connected to each other, and a cavity mouth of the concave cavity is formed on a side of the first cavity away from the second cavity; the first cavity is formed by CNC processing; the second cavity is formed by electric spark processing; the present invention can avoid causing the cavity wall draft angle of the concave cavity to become smaller or even form an undercut, so as to avoid causing product damage or scraping, thereby improving product quality; the present invention also discloses a mold and a processing method of the front mold capable of improving product quality.

Description

Technical Field

[0001] The invention relates to the field of mold equipment, and in particular to a front mold, a mold and a processing method of the front mold which can improve product quality. Background Art

[0002] Injection molding is a relatively mature technology. For some products, such as speakers, since the outer surface of the front shell or the rear shell of the product is a hemispherical surface, when processing the mold for molding the product, it is necessary to process a hemispherical cavity on the front mold.

[0003] Specifically, the processing technology of the front mold is as follows: electrospark machining is used to form a hemispherical cavity, and then the cavity wall of the cavity is vigorously polished with an oilstone. The oilstone grinds off the harder layer of the cavity wall caused by the electrospark machining, and then the cavity wall polished with the oilstone is polished with sandpaper to complete the die saving of the cavity; however, since the cavity wall of the cavity is close to the cavity mouth of the cavity at a sharp corner, in order to prevent the oilstone from grinding too hard and saving the sharp corner into a round mouth during operation, the die saving technician will keep a certain distance between the contact point between the oilstone and the cavity wall of the cavity and the surface where the cavity mouth is located. At this time, the portion of the cavity wall of the cavity within this distance cannot be polished, and the rest of the cavity wall gradually expands away from the center during the polishing process, which can easily cause the draft angle of the cavity wall of the cavity to become smaller or even form an undercut. In this way, when molding products, it is easy to cause product scratches or drags, and the product quality is poor. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, one of the objects of the present invention is to provide a front mold that can improve product quality. The second object of the present invention is to provide a mold, both of which can avoid causing the cavity wall draft angle to become smaller or even forming an undercut, so as to avoid causing product scratches or drags and improve product quality.

[0005] The third purpose of the present invention is to provide a front mold processing method that can improve product quality, which can process a front mold that avoids causing the cavity wall draft angle to become smaller or even forming an undercut, thereby avoiding product scratches or drags, thereby improving product quality.

[0006] One of the purposes of the present invention is achieved by the following technical solution:

[0007] A front mold capable of improving product quality includes a front mold body, the front mold body having a concave cavity, the concave cavity being divided into a first cavity and a second cavity which are connected and linked to each other, the cavity mouth of the concave cavity being formed on a side of the first cavity away from the second cavity; the first cavity is formed by CNC machining; the second cavity is formed by electrospark machining.

[0008] Furthermore, a first positioning structure is provided on a surface of the front mold body that faces the same direction as the cavity opening of the concave cavity.

[0009] Furthermore, the demoulding slope of the cavity wall of the concave cavity is 5°.

[0010] Furthermore, the front mold body is also provided with a concave stop located on a side of the first cavity away from the second cavity.

[0011] Furthermore, the side wall of the concave stop has a single-sided slope of 1°.

[0012] Furthermore, the cavity wall of the concave cavity is provided with a pattern, and the pattern gradually becomes thicker from one side of the cavity opening of the concave cavity to the other side.

[0013] Furthermore, the plane where the cavity opening of the concave cavity is located coincides with the end face of the concave stop and forms a PL face; the face where the opening of the concave stop is located forms an exhaust face; the PL face is provided with a first exhaust ring groove extending along its circumference; the PL face is also provided with first exhaust grooves arranged in the first exhaust ring groove in sequence and at intervals along the circumference of the first exhaust ring groove; the first exhaust groove connects the first exhaust ring groove and the first cavity, and the groove depth of the first exhaust groove is shallower than the groove depth of the first exhaust ring groove; the front mold body is also provided with a plurality of second exhaust grooves; a plurality of second exhaust grooves are arranged outside the first exhaust ring groove in sequence and at intervals along the circumference of the first exhaust ring groove; each of the second exhaust grooves passes through the PL face, the side face of the concave stop and the exhaust face, and is connected to the first exhaust ring groove and the outside.

[0014] Furthermore, the bottom of the second cavity is provided with a second exhaust ring groove, an exhaust channel and a plurality of third exhaust grooves; the plurality of third exhaust grooves are arranged outside the second exhaust ring groove in sequence and at intervals along the extension direction of the second exhaust ring groove; the groove depth of the third exhaust groove is shallower than the groove depth of the second exhaust ring groove, and the second cavity and the second exhaust ring groove are connected; the exhaust channel is arranged in the second exhaust ring groove, and is connected with the second exhaust ring groove and the outside.

[0015] The second object of the present invention is achieved by adopting the following technical solution:

[0016] A mold comprises a rear mold and the above-mentioned front mold capable of improving product quality, wherein a first positioning structure is arranged on the surface of the front mold body facing the same direction as the cavity opening of the concave cavity, and the rear mold is provided with a second positioning structure matched with the first positioning structure; the front mold body is also provided with a concave stop located on the side of the first cavity away from the second cavity; the rear mold is provided with a convex stop matched with the concave stop.

[0017] The third object of the present invention is achieved by adopting the following technical solution:

[0018] A front mold processing method capable of improving product quality comprises the following steps:

[0019] The first cavity is machined on the front mold body by CNC;

[0020] Grinding the cavity wall of the first cavity with sandpaper to make the cavity wall of the first cavity smooth;

[0021] After CNC machining, the second cavity is machined from the cavity bottom of the first cavity toward the cavity opening away from the first cavity by using electric spark machining, so that the first cavity and the second cavity are connected to each other and cooperate to form a concave cavity;

[0022] The cavity wall of the second cavity is roughly polished with an oil stone, and after the polishing with the oil stone, the cavity wall of the second cavity is finely polished with sandpaper to make the cavity wall of the second cavity smooth;

[0023] Graining is performed on the cavity wall of the first cavity and the cavity wall of the second cavity.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention divides the concave cavity into a first cavity and a second cavity, and the cavity opening of the concave cavity is formed on the side of the first cavity away from the second cavity, and the first cavity is processed by CNC. In this way, CNC processing will not cause the cavity wall of the first cavity to be too hard compared to electric spark processing. In this way, the mold saving can be completed by only using sandpaper to gently remove the knife marks formed by CNC processing. In this process, it is not necessary to use an oil stone for hard grinding, which avoids the situation that the oil stone saves the sharp corner of the cavity wall of the first cavity close to the cavity opening of the concave cavity into a rounded opening, and the sandpaper can be closely attached to the side of the first cavity close to the cavity opening. , the cavity wall of the first cavity is completely polished; furthermore, the second cavity is processed by electrospark machining. At this time, since the first cavity maintains a certain distance between the second cavity and the cavity mouth of the concave cavity, when the cavity wall of the second cavity is polished with an oilstone, the oilstone can be pressed against the edge of the second cavity close to the first cavity to achieve complete polishing of the cavity wall of the second cavity; thus, the complete polishing of the cavity wall of the concave cavity can avoid reducing the draft angle of the cavity wall of the concave cavity or even forming an undercut. In this way, when molding the product, it can avoid causing product scratches or drags, thereby improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the front mold that can improve product quality according to the present invention;

[0027] Figure 2 It is a structural schematic diagram of the mold of the present invention.

[0028] In the figure: 10, front mold body; 20, concave cavity; 21, first cavity; 22, second cavity; 32, second positioning structure; 42, convex stop; 50, PL surface; 60, exhaust surface; 70, first exhaust ring groove; 80, first exhaust groove; 90, second exhaust groove; 100, second exhaust ring groove; 110, exhaust channel; 120, third exhaust groove; 130, rear mold; 140, product. DETAILED DESCRIPTION

[0029] like Figure 1 As shown, the front mold capable of improving product quality includes a front mold body 10, the front mold body 10 has a concave cavity 20, and the concave cavity 20 is divided into a first cavity 21 and a second cavity 22 which are connected and linked to each other; the cavity opening of the concave cavity 20 is formed on the side of the first cavity 21 away from the second cavity 22. It can be understood that the first cavity 21 makes the second cavity 22 maintain a certain distance from the cavity opening of the concave cavity 20; the first cavity 21 is formed by CNC processing. At this time, since the CNC processing will not cause the cavity wall of the first cavity 21 to be too hard, and the knife marks formed in the CNC processing are relatively fine, in this way, the cavity wall of the first cavity 21 can be directly polished lightly with sandpaper to remove the knife marks. Specifically, sandpaper with a specification of 600#-800# can be used to complete the mold saving. In this process, there is no need to use an oil stone for hard polishing, which avoids the oil stone bringing the cavity wall of the first cavity 21 close to the concave cavity 20. In the case where the sharp corner of the cavity opening is rounded, sandpaper can be placed close to the side of the first cavity 21 close to the cavity opening to completely grind the cavity wall of the first cavity 21; at the same time, the second cavity 22 is formed by electrospark machining, and the second cavity 22 maintains a certain distance between the first cavity 21 and the cavity opening of the concave cavity 20. In this way, when the cavity wall of the second cavity 22 is grinded with an oilstone, the oilstone can be placed close to the edge of the second cavity 22 close to the first cavity 21 to completely grind the cavity wall of the second cavity 22; thus, by completely grinding the cavity wall of the first cavity 21 and the cavity wall of the second cavity 22, the cavity wall of the concave cavity 20 is completely polished, which can avoid causing the draft angle of the cavity wall of the concave cavity 20 to become smaller or even forming an undercut. In this way, when molding the product 140, it can avoid causing the product 140 to be scratched or scratched, thereby improving the quality of the product 140.

[0030] It should be noted that when CNC machining is used, the machining depth is limited. In the present application, the first cavity 21 is machined by CNC, and the second cavity 22 is machined by electrospark machining, thereby ensuring the depth of the cavity 20.

[0031] Furthermore, a first positioning structure is provided on the front mold body 10, and the first positioning structure is provided on the surface of the front mold body 10 facing the same direction as the cavity opening of the concave cavity 20, and the first positioning structure can match the corresponding structure of the rear mold 130 of the mold, so as to form positioning during the mold opening process of the front mold and the rear mold 130, so as to avoid the front mold and the rear mold 130 being misaligned and causing the product 140 to be scratched or strained;

[0032] Furthermore, the first positioning structure is a positioning column, and the extending direction of the positioning column is parallel to the mold opening direction, that is, the inclination of the first positioning column is 0°.

[0033] Specifically, the demolding slope of the cavity wall of the cavity 20 is 5°, which can greatly reduce the risk of scratches and strains on the product 140 compared to the existing design with a demolding slope of 3°.

[0034] Furthermore, the front mold body 10 is also provided with a concave stop located on the side of the first cavity 21 away from the second cavity 22, and the rear mold 130 of the mold is provided with a convex stop 42 matching it, which plays a further positioning role and further improves the quality of the product 140.

[0035] Specifically, the side wall of the recessed stop has a single-sided slope of 1°. It is worth mentioning that the inclination direction of the side wall of the recessed stop is the same as the inclination direction of the cavity wall of the cavity 20, that is, the side wall of the recessed stop is in an outward expansion shape from one side close to the cavity 20 to the other side; at this time, the inclination of the side wall of the recessed stop is smaller than the draft angle of the cavity wall of the cavity 20, which can play a role in precise positioning when opening the mold, and can greatly reduce the risk of scratches and strains on the product 140. Furthermore, the cavity wall of the concave cavity 20 is provided with a pattern, and the pattern gradually becomes thicker from one side of the cavity mouth of the concave cavity 20 to the other side; because after the mold is closed, a large extrusion pressure is formed at the cavity mouth of the concave cavity 20, and the extrusion pressure decreases from one side of the cavity mouth of the concave cavity 20 to the other side, therefore, in this embodiment, the cavity wall of the concave cavity 20 is provided with a pattern, and the pattern gradually becomes thicker from one side of the cavity mouth of the concave cavity 20 to the other side. At this time, the thickness of the fine lines is in the same direction as the increasing direction of the extrusion pressure, so as to avoid the formation of a pattern with relatively consistent depth on the product 140 under the action of pressure, thereby further improving the quality of the product 140.

[0036] Specifically, the cavity wall of the cavity 20 can be divided into a first layer, a second layer and a third layer from one side of the cavity mouth of the cavity 20 to the other side. The first layer is provided with a YS1284 pattern, the second layer is provided with a gradient pattern of YS1284 and YS1286 from one side close to the first layer to the other side, and the third layer is provided with a YS1286 pattern, so that the pattern gradually becomes thicker.

[0037] More specifically, the surface where the cavity mouth of the cavity 20 is located is formed as a PL surface 50, the portion of the cavity wall of the cavity 20 within 1.00 mm from the PL surface 50 is the first layer, the portion of the cavity wall of the cavity 20 at a distance of 1.00 mm-3.00 mm from the PL surface 50 is the second layer, and the portion of the cavity wall of the cavity 20 at a distance greater than 3.00 mm from the PL surface 50 is the third layer.

[0038] It is worth mentioning that the depths of the first cavity 21 and the second cavity 22 can be set respectively according to the size of the specific product 140. In this embodiment, the depth of the first cavity 21 is set to between 6mm and 8mm, that is, the lowest point of the first cavity 21 is between 6mm and 8mm from the PL surface 50.

[0039] Since trapped gas such as gas will be generated during the molding process of the product 140, if the trapped gas is not discharged in time, the trapped gas will easily burn and cause problems such as the whitening of the product 140. In the present invention, preferably, the plane where the cavity mouth of the concave cavity 20 is located coincides with the end face of the concave stopper and forms a PL surface 50; the surface where the mouth of the concave stopper is located forms an exhaust surface 60; the PL surface 50 is provided with a first exhaust ring groove 70 extending along its circumference, specifically, the first exhaust ring groove 70 is closed at its ends; the PL surface 50 is also provided with a plurality of exhaust ring grooves 70 arranged in the first exhaust ring groove 70 in sequence along the circumference of the first exhaust ring groove 70. The first exhaust groove 80 is connected to the first exhaust ring groove 70 and the first cavity 21; the front mold body 10 is also provided with a plurality of second exhaust grooves 90; the plurality of second exhaust grooves 90 are arranged outside the first exhaust ring groove 70 in sequence and at intervals along the circumferential direction of the first exhaust ring groove 70; each second exhaust groove 90 passes through the PL surface 50, the side surface of the concave stop and the exhaust surface 60, and is connected to the first exhaust ring groove 70 and the outside; in this way, during the molding process, the trapped air is discharged to the outside through the first exhaust groove 80, the first exhaust ring groove 70 and the second exhaust groove 90, so as to achieve timely exhaust.

[0040] It is worth mentioning that the first exhaust groove 80 has a side air inlet, and the direction of the side air inlet is not parallel to the mold opening direction. The gas in the concave cavity 20 enters the first exhaust groove 80 through the side air inlet of the first exhaust groove 80; at the same time, when the front mold and the external rear mold 130 are molded, there is a certain gap between the rear mold 130 and the bottom of the first exhaust groove 80, the first exhaust ring groove 70 and the second exhaust groove 90 to ensure that the gas can flow in the first exhaust groove 80, the first exhaust ring groove 70 and the second exhaust groove 90.

[0041] More preferably, the groove depth of the first exhaust groove 80 is shallower than the groove depth of the first exhaust ring groove 70. It should be noted that the groove depth of the first exhaust groove 80 and the groove depth of the first exhaust ring groove 70 both refer to their depths in the mold opening direction. At this time, the depth of the first exhaust groove 80 connected to the cavity 20 is shallower, which can avoid flash of the product 140; here, the depth of the first exhaust groove 80 is preferably 0.02mm, and the depths of the first exhaust ring groove 70 and the second exhaust groove 90 are preferably 0.3mm.

[0042] It is worth mentioning that the recessed stop is composed of a short hole and an end face. In the present embodiment, the end face is the PL face 50. The inner diameter of the short hole is larger than the diameter of the cavity opening of the first cavity 21, and the side and end faces of the short hole are perpendicular to each other. It should be noted here that the side wall of the recessed stop refers to the hole wall of the short hole; the mouth of the recessed stop refers to the mouth of the short hole away from the end face.

[0043] Furthermore, a second exhaust annular groove 100, an exhaust channel 110 and a plurality of third exhaust grooves 120 are provided at the bottom of the second cavity 22; the plurality of third exhaust grooves 120 are arranged in sequence and spaced apart along the extension direction of the second exhaust annular groove 100, and are arranged outside the second exhaust annular groove 100. At this time, the third exhaust groove 120 connects the second cavity 22 and the second exhaust annular groove 100; the exhaust channel 110 is provided in the second exhaust annular groove 100, and connects the second exhaust annular groove 100 and the outside. In this way, the gas can be discharged from the concave cavity 20 to the outside through the third exhaust groove 120, the second exhaust annular groove 100 and the exhaust channel 110 in sequence, thereby reducing the possibility of the product 140 turning white.

[0044] Furthermore, the groove depth of the third exhaust groove 120 is shallower than the groove depth of the second exhaust ring groove 100. The shallower groove depth of the third exhaust groove 120 can avoid flash of the product 140; here, the depth of the third exhaust groove 120 is preferably 0.02mm, and the depth of the second exhaust ring groove 100 is preferably 0.3mm.

[0045] It is worth mentioning that the simultaneous arrangement of the first exhaust groove 80 , the first exhaust ring groove 70 , the second exhaust groove 90 , the second exhaust ring groove 100 , the exhaust channel 110 and the plurality of third exhaust grooves 120 can improve the exhaust effect and prevent the product 140 from turning white to a greater extent.

[0046] like Figure 1-2As shown, the present invention also discloses a mold, including a rear mold 130 and the above-mentioned front mold capable of improving product quality; a first positioning structure is provided on the surface of the front mold body 10 facing the same direction as the cavity opening of the concave cavity 20, and the rear mold 130 is provided with a second positioning structure 32 matched with the first positioning structure; specifically, the first positioning structure is a positioning column, and the extension direction of the positioning column is parallel to the mold opening direction of the mold, and the second positioning structure 32 is a positioning groove. In this way, during the mold opening process, misalignment between the front mold and the rear mold 130 can be avoided, and the misalignment of the rear mold 130 can be avoided to cause dragging on the product 140, so as to further improve the quality of the product 140.

[0047] More specifically, the front mold body 10 is also provided with a concave stopper located on the side of the first cavity 21 away from the second cavity 22; the rear mold 130 is provided with a convex stopper 42 that cooperates with the concave stopper, so as to further position the front mold and the rear mold 130 and further improve the quality of the product 140.

[0048] The present invention also discloses a front mold processing method capable of improving product quality, comprising the following steps:

[0049] The first cavity 21 is formed on the front mold body 10 by CNC machining. At this time, CNC machining will not make the cavity wall of the first cavity 21 too hard compared to EDM machining, and the knife marks formed in CNC machining are finer.

[0050] Sandpaper is used to grind the cavity wall of the first cavity 21 to make the cavity wall of the first cavity 21 smooth; in this way, the knife marks can be removed by directly using sandpaper to gently grind the cavity wall of the first cavity 21, so that the cavity wall of the first cavity 21 is smooth and the mold saving is completed. In this process, it is not necessary to use an oil stone for hard grinding, so as to avoid the situation where the oil stone saves the sharp corner of the cavity wall of the first cavity 21 close to the cavity opening of the concave cavity 20 into a rounded mouth. The sandpaper can be closely attached to the side of the first cavity 21 close to the cavity opening to completely grind the cavity wall of the first cavity 21;

[0051] After CNC machining, the second cavity 22 is machined from the bottom of the first cavity 21 toward the cavity opening away from the first cavity 21 by using electric spark machining, so that the first cavity 21 and the second cavity 22 are connected to each other and cooperate to form the concave cavity 20; it can be understood that the cavity opening of the first cavity 21 is the cavity opening of the concave cavity 20; the second cavity 22 maintains a certain distance between the cavity openings of the first cavity 21 and the concave cavity 20, so that when the wall of the second cavity 22 is polished by using an oil stone, the oil stone can be pressed against the edge of the second cavity 22 close to the first cavity 21 to achieve complete polishing of the cavity wall of the second cavity 22;

[0052] From the above, it can be seen that by completely polishing the cavity wall of the first cavity 21 and the cavity wall of the second cavity 22, the cavity wall of the concave cavity 20 can be completely polished, which can avoid causing the draft angle of the cavity wall of the concave cavity 20 to become smaller or even form an undercut. In this way, when molding the product 140, it can avoid causing the product 140 to be stretched or scratched, thereby improving the quality of the product 140.

[0053] More specifically, the cavity wall of the first cavity 21 and the cavity wall of the second cavity 22 are subjected to sun-drying, and the texture gradually becomes thicker from one side of the cavity opening of the first cavity 21 to the other side.

[0054] The processing method of the front mold capable of improving product quality may further include the following steps:

[0055] The draft angle of the cavity wall of the cavity 20 is processed to 5°;

[0056] A first positioning structure is processed on the front mold body 10, and the extending direction of the first positioning structure is parallel to the mold opening direction;

[0057] A concave stop is machined on the front mold body 10, and the side wall of the concave stop has a single-side slope of 1°;

[0058] The plane where the cavity opening of the concave cavity 20 is located is set to coincide with the end surface of the concave stop, and the plane where the cavity opening of the concave cavity 20 is located is formed as a PL surface 50; a first exhaust ring groove 70, a plurality of first exhaust grooves 80 and a plurality of second exhaust grooves 90 are processed on the cavity bottom of the first cavity 21, wherein the plurality of first exhaust grooves 80 are arranged in the first exhaust ring groove 70 in sequence and at intervals along the circumference of the first exhaust ring groove 70, and the first exhaust grooves 80 are connected to the first exhaust ring groove 70 and the first cavity 21; a plurality of second exhaust grooves 90 are arranged outside the first exhaust ring groove 70 in sequence and at intervals along the circumference of the first exhaust ring groove 70, and the second exhaust grooves 90 are connected to the first exhaust ring groove 70 and the outside; at the same time, the groove depth of the first exhaust ring groove 70 can also be processed to be deeper than the first exhaust groove 80;

[0059] A second exhaust ring groove 100, an exhaust channel 110 and a plurality of third exhaust grooves 120 are provided at the bottom of the second cavity 22; the plurality of third exhaust grooves 120 are arranged outside the second exhaust ring groove 100 in a sequentially spaced arrangement along the extension direction of the second exhaust ring groove 100; the groove depth of the third exhaust groove 120 is shallower than the groove depth of the second exhaust ring groove 100, and the second cavity 22 and the second exhaust ring groove 100 are connected; the exhaust channel 110 is provided in the second exhaust ring groove 100, and is connected to the second exhaust ring groove 100 and the outside.

[0060] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A front mold processing method capable of improving product quality, characterized in that: The front mold includes a front mold body, the front mold body has a concave cavity, the concave cavity is divided into a first cavity and a second cavity that are connected and connected to each other, and the cavity opening of the concave cavity is formed on a side of the first cavity away from the second cavity; the first cavity is processed by CNC, and the cavity wall is polished with sandpaper; the second cavity is processed by electric spark, and the cavity wall is polished with oilstone; The following steps are involved: The first cavity is machined on the front mold body by CNC; Grinding the cavity wall of the first cavity with sandpaper to make the cavity wall of the first cavity smooth; After CNC machining, the second cavity is machined from the bottom of the first cavity toward the cavity opening away from the first cavity by using electric spark machining, so that the first cavity and the second cavity are connected to each other and cooperate to form a concave cavity; The cavity wall of the second cavity is roughly polished with an oil stone, and after the oil stone polishing, the cavity wall of the second cavity is finely polished with sandpaper to make the cavity wall of the second cavity smooth; Carrying out graining on the cavity wall of the first cavity and the cavity wall of the second cavity; A first positioning structure is provided on the surface of the front mold body facing the same direction as the cavity opening of the concave cavity; The demoulding slope of the cavity wall of the cavity is 5 °; The front mold body is also provided with a concave stopper located on the side of the first cavity away from the second cavity; the side wall of the concave stopper has a single-side slope of 1°; The cavity wall of the concave cavity is provided with a pattern, and the pattern gradually becomes thicker from one side of the cavity opening of the concave cavity to the other side.

2. A front mold processing method capable of improving product quality as claimed in claim 1, characterized in that: The plane where the cavity opening of the concave cavity is located coincides with the end face of the concave stop and forms a PL face; the face where the opening of the concave stop is located forms an exhaust face; the PL face is provided with a first exhaust ring groove extending along its circumference; the PL face is also provided with first exhaust grooves arranged in the first exhaust ring groove in sequence and at intervals along the circumference of the first exhaust ring groove; the first exhaust groove connects the first exhaust ring groove and the first cavity, and the groove depth of the first exhaust groove is shallower than the groove depth of the first exhaust ring groove; the front mold body is also provided with a plurality of second exhaust grooves; a plurality of second exhaust grooves are arranged outside the first exhaust ring groove in sequence and at intervals along the circumference of the first exhaust ring groove; each of the second exhaust grooves passes through the PL face, the side face of the concave stop and the exhaust face, and is connected to the first exhaust ring groove and the outside.

3. A front mold processing method capable of improving product quality as described in any one of claims 1-2, characterized in that: A second exhaust ring groove, an exhaust channel and a plurality of third exhaust grooves are provided at the bottom of the second cavity; the plurality of third exhaust grooves are arranged outside the second exhaust ring groove in an interval arrangement along the extension direction of the second exhaust ring groove; the groove depth of the third exhaust groove is shallower than the groove depth of the second exhaust ring groove, and the third exhaust groove connects the second cavity and the second exhaust ring groove; the exhaust channel is provided in the second exhaust ring groove, and connects the second exhaust ring groove and the outside.

4. A mold, characterized in that: It comprises a rear mold and a front mold prepared by the processing method of a front mold capable of improving product quality as claimed in claim 1, wherein the rear mold is provided with a second positioning structure matched with the first positioning structure; and the rear mold is provided with a convex stopper matched with the concave stopper.

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