Extrusion die positioning device and extrusion die

Abstract

The present invention provides an extrusion die positioning device and an extrusion die, comprising a positioning mandrel (01) and a fluoroplastic gasket (02), wherein the positioning mandrel (01) comprises a positioning mandrel minor diameter and a positioning mandrel major diameter, and the fluoroplastic gasket (02) is sleeved on the positioning mandrel minor diameter. The present invention has a simple and reasonable structure and is easy to install. It can withstand the extrusion force during the bearing forming process and prevent the inner diameter of the bearing from being deformed. Moreover, since PTFE has a self-lubricating function, the bearing is easy to be taken out of the positioning device, thereby preventing the inner hole surface of the bearing from being scratched.

Description

Technical Field

[0001] The present invention relates to the technical field of dies, and in particular to an extrusion die positioning device and an extrusion die, and in particular to a spherical bearing extrusion forming die positioning device and an extrusion die. Background Art

[0002] When the inner ring of the self-lubricating spherical plain bearing is made of aluminum alloy or titanium alloy, due to the poor deformation resistance of the material, it is easy to cause the inner ring to deform after extrusion molding, or even lock, and scratches will appear during the removal of the bearing, which will affect the product quality. If the gap between the positioning mandrel and the inner ring of the bearing is too large, the inner ring of the bearing will deform due to lack of support, and the product size will not meet the design requirements.

[0003] Patent document with publication number CN110314953A discloses a multi-section conical surface spherical bearing extrusion die, including an upper extrusion die and a lower extrusion die, a spherical bearing outer ring blank is placed between the upper extrusion die and the lower extrusion die, a spherical bearing inner ring is placed inside the spherical bearing outer ring blank, and the mold cavities inside the upper extrusion die and the lower extrusion die are provided with a first-dimensional conical surface cavity, a second-dimensional conical surface cavity and a curved surface cavity from the inside to the outside. The present invention adopts a two-dimensional conical surface mold cavity structure, which can be beneficial to the storage of medium at the junction of the one-dimensional conical surface mold cavity and the two-dimensional conical surface mold cavity, thereby enhancing the lubrication effect, helping to eliminate bonding defects caused by excessive friction, reducing the contact stress during the deformation of the bearing outer ring and the extrusion force required for deformation, and improving the surface quality of the bearing extrusion surface; at the end of the extrusion mold, the extrusion mold adopts a curved surface mold cavity structure, which helps to improve the closing ability of the outer ring of the joint bearing, improve the angle quality of the inner and outer rings of the bearing, and improve the bearing capacity of the bearing; however, this scheme does not take into account the problem of poor deformation resistance of the joint bearing material, nor does it take into account the damage to the bearing during the removal process of the joint bearing after extrusion molding.

[0004] Therefore, it is necessary to design an extrusion die positioning device that can withstand the extrusion force during the bearing forming process to prevent the inner diameter of the bearing from deforming; and can also facilitate the mold to scratch the bearing when the bearing is removed after forming. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide an extrusion die positioning device and an extrusion die.

[0006] According to one aspect of the present invention, an extrusion die positioning device is provided, comprising a positioning mandrel and a fluoroplastic gasket, wherein the positioning mandrel comprises a positioning mandrel minor diameter and a positioning mandrel major diameter, and the fluoroplastic gasket is sleeved on the positioning mandrel minor diameter.

[0007] Preferably, the fluoroplastic gasket is connected to the small-diameter positioning mandrel by interference fit.

[0008] Preferably, the fluoroplastic gasket is detachably connected to the small diameter of the positioning core shaft.

[0009] Preferably, the fluoroplastic gasket comprises a metal substrate, an electroplated copper layer, a copper powder layer and a PTFE layer, and the electroplated copper layer, the copper powder layer and the PTFE layer are sequentially arranged on the surface of the metal substrate from the inside to the outside.

[0010] Preferably, the copper powder layer is a sintered copper powder layer, the PTFE layer is a sintered PTFE layer, and the metal matrix is ​​a heat-treated metal matrix.

[0011] Preferably, a groove is provided on the side surface of the fluoroplastic gasket, and the groove is arranged in a straight line or a curve from one end surface to the other end surface of the fluoroplastic gasket.

[0012] Preferably, the width of the slot is 2 mm.

[0013] Preferably, the fluoroplastic gasket is clearance-fitted with the inner diameter of the product to be extruded.

[0014] Preferably, the positioning mandrel is made of a heat-treated metal substrate.

[0015] According to another aspect of the present invention, there is provided an extrusion die, comprising the extrusion die positioning device.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention has a simple and reasonable structure and is easy to install. It can withstand the extrusion force during the bearing forming process and prevent the inner diameter of the bearing from being deformed. In addition, since PTFE has a self-lubricating function, the bearing can be easily removed from the positioning device to prevent scratches on the inner hole surface of the bearing.

[0018] 2. Compared with the conventional extrusion die without fluoroplastic washers, the fluoroplastic washers of the present invention can absorb overpressure, reduce friction and shock, thereby reducing the deformation of bearing parts during extrusion and improving the extrusion effect.

[0019] 3. Compared with the conventional extrusion die without fluoroplastic washers, the fluoroplastic washers in the present invention replace the positioning core shaft to bear the friction and wear during extrusion. When the parts are worn, only the fluoroplastic washers need to be replaced, thus saving processing costs.

[0020] 4. The surface of the fluoroplastic gasket of the present invention is made of soft material, which can fully fit with the inner hole of the inner ring of the bearing, increase the contact area, and make the stress distribution more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 It is a cross-sectional schematic diagram of the extrusion die of the present invention during use, and the view is a half-side schematic diagram of the extrusion die with the central axis as the dividing line.

[0023] Figure 2 It is a structural schematic diagram of the positioning mandrel of the present invention.

[0024] Figure 3 It is a schematic diagram of the structure of the fluoroplastic gasket of the present invention.

[0025] The figure shows:

[0026] 01—positioning mandrel, 02—fluoroplastic gasket DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0028] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] The present invention discloses a new extrusion die positioning device and an extrusion die, comprising a positioning mandrel and a fluoroplastic gasket, wherein the inner hole of the fluoroplastic gasket is interference-fitted with the outer surface of the positioning mandrel at the minor diameter, and the outer diameter is interference-fitted with the inner hole of the bearing inner ring. The positioning mandrel, the fluoroplastic gasket, and the inner and outer rings of the bearing are placed in an R groove (molding groove) of an extrusion R die (extrusion die) as a whole to form a complete set of extrusion dies, and the extrusion R die is self-aligned with the outer diameter of the bearing outer ring through the R groove to complete the positioning. The outer surface of the metal matrix of the fluoroplastic gasket is a composite coating, including electroplated copper, copper powder and PTFE. The fluoroplastic gasket is rolled from a sheet. The positioning mandrel of the extrusion die can withstand the extrusion force during the bearing molding process to prevent the inner diameter of the bearing from being deformed; and because the PTFE has a self-lubricating function, the bearing is easy to remove from the positioning device to prevent the surface of the inner hole of the bearing from being scratched; at the same time, the present invention has a simple structure and is easy to install.

[0030] According to one aspect of the present invention, Figure 1-3As shown, an extrusion die positioning device is provided, including a positioning mandrel and a fluoroplastic gasket, wherein the positioning mandrel includes a positioning mandrel minor diameter and a positioning mandrel major diameter, and the fluoroplastic gasket is sleeved on the positioning mandrel minor diameter. The fluoroplastic gasket is connected to the positioning mandrel minor diameter by interference fit. The fluoroplastic gasket is detachably connected to the positioning mandrel minor diameter. The fluoroplastic gasket includes a metal substrate, an electroplated copper layer, a copper powder layer and a PTFE layer, and the surface of the metal substrate is sequentially provided with an electroplated copper layer, a copper powder layer and a PTFE layer from the inside to the outside. The copper powder layer is a sintered copper powder layer, the PTFE layer is a sintered PTFE layer, and the metal substrate is a heat-treated metal substrate. A groove is provided on the side of the fluoroplastic gasket, and the groove is provided in a straight line or a curve from one end face of the fluoroplastic gasket to the other end face. The width of the groove is 2 mm. The fluoroplastic gasket is fitted with the inner diameter of the product to be extruded through a clearance fit. The positioning mandrel is made of a heat-treated metal substrate. The metal base of the positioning mandrel and the fluoroplastic gasket is heat treated to improve its bearing capacity. The metal base of the fluoroplastic gasket is rolled from a sheet.

[0031] According to another aspect of the present invention, an extrusion die is provided, comprising the extrusion die positioning device. Figure 1 As shown, the inner hole of the fluoroplastic gasket is interference fit with the outer surface of the positioning core shaft at the small diameter; the inner surface of the bearing inner ring is matched with the outer surface of the fluoroplastic gasket with a certain clearance; the large diameter of the positioning core shaft is installed in the extrusion R mold (lower mold); a load is applied to the end face of the upper mold of the extrusion R mold, so that the outer ring of the bearing is plastically deformed along the R mold, thereby achieving the purpose of bearing assembly.

[0032] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An extrusion die positioning device, characterized in that: It comprises a positioning mandrel (01) and a fluoroplastic gasket (02), wherein the positioning mandrel (01) comprises a positioning mandrel minor diameter and a positioning mandrel major diameter, and the fluoroplastic gasket (02) is sleeved on the positioning mandrel minor diameter; The fluoroplastic gasket (02) is connected to the positioning mandrel with a small diameter interference fit; The fluoroplastic gasket (02) is detachably connected to the small diameter of the positioning mandrel; The side surface of the fluoroplastic gasket (02) is provided with a groove, and the groove is arranged in a straight line or a curve from one end surface to the other end surface of the fluoroplastic gasket (02); The fluoroplastic gasket (02) is fitted with the inner diameter of the product to be extruded through clearance; The fluoroplastic gasket (02) comprises a metal substrate, an electroplated copper layer, a copper powder layer and a PTFE layer, wherein the electroplated copper layer, the copper powder layer and the PTFE layer are sequentially arranged on the surface of the metal substrate from the inside to the outside; The copper powder layer is a sintered copper powder layer, the PTFE layer is a sintered PTFE layer, and the metal matrix is ​​a heat-treated metal matrix; The width of the slot is 2 mm.

2. The extrusion die positioning device according to claim 1, characterized in that: The positioning mandrel (01) is made of a heat-treated metal matrix.

3. An extrusion die, characterized in that: It comprises the extrusion die positioning device as described in any one of claims 1-2.

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