Inverted conical surface necking die

Abstract

The utility model relates to the technical field of closing-in processing, and discloses a closing-in die with an inverted conical surface, which comprises a supporting mandrel, an inverted conical die, a spring and a tail cover, the inverted conical die comprises a head part and a tail part, the inverted conical die is provided with a through hole along the axial direction, the through hole of the head part is provided with a closing-in extrusion surface, and the closing-in extrusion surface is an inner conical surface; a limiting step and a closing-up supporting surface are arranged on the supporting mandrel; the supporting mandrel is connected in the through hole of the back taper die in a sliding mode, the tail cover is installed in the through hole of the back taper die, and the spring is arranged between the supporting mandrel and the tail cover. By means of the designed inverted cone die, machining of cover parts is not limited to lathe machining, a bench worker can also use the tool for machining, and the machining efficiency is greatly improved; compared with an original closing-in tool, the one-time forming machining qualification rate of the back taper closing-in die is greatly improved, the rework rate is continuously reduced in the using process, at present, the part does not need to be repaired after being machined, and the conformity of the machined part to a product pattern is high.

Description

Technical Field

[0001] This utility model relates to the field of edge finishing technology, specifically, it is an inverted conical edge finishing mold. Background Technology

[0002] Machining cover-type parts requires high compliance with product drawings. In aerospace and hydraulic products, cover-type parts, due to material strength and environmental characteristics, necessitate the use of specialized tooling and strenuous manual labor for batch processing. Therefore, enabling the one-time forming of cover-type parts using ordinary lathes or by fitter is of great significance in overcoming practical production bottlenecks.

[0003] For protective cover-like parts used in certain products, the conformity of their external dimensions and internal hole dimensions to the drawings places high demands on the use and assembly of the parts. For larger or easily clamped parts, turning or milling can be used to improve dimensional compliance with the drawings. However, for smaller or difficult-to-clamp parts, turning or milling is not feasible. Using conventional die-cutting methods results in low pass rates, high rework rates, and repeated machining can negatively impact fatigue strength. Furthermore, these parts have specific surface roughness requirements, and disassembly after die-cutting is inconvenient. Sometimes, unnecessary bumps and scratches can occur during the disassembly of qualified parts, leading to rework of qualified parts, and even situations where reworked parts exceed dimensional tolerances and are rendered unusable. Utility Model Content

[0004] The purpose of this invention is to provide an inverted conical surface closing mold to solve the problems of existing closing tooling being unsuitable for processing high-requirement cover-type parts and having low processing quality.

[0005] This utility model is achieved through the following technical solution: a tapered die for closing the part, comprising a support mandrel, a tapered die, a spring, and a tail cap. The tapered die includes a head and a tail. The tapered die has a through hole along the axial direction. A closing extrusion surface is provided at the through hole of the head. The closing extrusion surface is an inner conical surface, and the diameter of one side of the inner conical surface at the end of the tapered die is larger than that of the other side. The support mandrel is provided with a limiting step and a closing support surface. The closing support surface cooperates with the closing extrusion surface to close the part. The limiting step is used to limit the support mandrel. The support mandrel is slidably connected in the through hole of the tapered die. The tail cap is installed in the through hole of the tapered die. The spring is disposed between the support mandrel and the tail cap.

[0006] To better realize this utility model, the taper of the constricted extrusion surface is further defined as 1°±0.1°.

[0007] To better realize this utility model, the surface roughness of the closing extrusion surface and the closing support surface is 0.4 micrometers.

[0008] To better realize this utility model, the supporting mandrel is made of 50CrVA and has a hardness of HRC45-51 after heat treatment; the tapered die is carburized with 1Cr11Ni2W2MoV at the extrusion surface, with a hardness of HRC58-62, while the hardness of the remaining non-carburized surfaces on the tapered die is HRC35-41.

[0009] To better realize this utility model, the head diameter of the inverted cone mold is larger than the tail diameter, and a chamfer is provided at the end of the head of the inverted cone mold.

[0010] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0011] (1) The present invention, through the design of the inverted cone mold, makes the processing of cover-type parts no longer limited to turning, but also allows fitters to use this tooling for processing, greatly improving processing efficiency;

[0012] (2) Compared with the original finishing tooling, the inverted cone finishing mold in this case has greatly improved the one-time forming qualification rate and the rework rate has been continuously reduced during use. Currently, the part does not need to be repaired after processing, and the part after processing has a high degree of conformity with the product drawing. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the overall structure of this utility model.

[0014] Figure 2 This is a cross-sectional view of the supporting mandrel structure.

[0015] Wherein: 101-Support mandrel; 102-Limiting step; 103-Closing support surface; 104-Inverted conical die; 105-Closing extrusion surface; 106-Spring; 107-Tail cap. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] Example 1:

[0019] This embodiment provides an inverted conical surface closing mold, specifically as follows: Figures 1-2 As shown, the assembly includes a support mandrel 101, a tapered die 104, a spring 106, and a tail cap 107. The tapered die 104 includes a head and a tail. The tapered die 104 has a through hole along its axial direction. A tapering extrusion surface 105 is provided at the through hole of the head. The tapering extrusion surface 105 is an inner conical surface, with one side of the inner conical surface at the end of the tapered die 104 having a larger diameter than the other side. The support mandrel 101 has a limiting step 102 and a tapering support surface 103. The tapering support surface 103 cooperates with the tapering extrusion surface 105 to tape the part. The limiting step 102 is used to limit the support mandrel 101. The support mandrel 101 is slidably connected in the through hole of the tapered die 104. The tail cap 107 is threadedly connected in the through hole of the tapered die 104. The spring 106 is disposed between the support mandrel 101 and the tail cap 107. All dimensions in the attached figures are in mm.

[0020] Based on the above-mentioned device, a method for closing the opening of cover-type parts is provided, mainly including the following steps:

[0021] Step 1: Select a tail cap 107 of appropriate length according to the specifications of the part to be processed, and then screw the tail cap 107 into the tapered die 104 to ensure that the tail cap 107 is firmly fixed on the tapered die 104. At this time, the spring 106 is pushed by the tail cap 107, so the spring 106 pushes the support spindle 101 to move until the limit step 102 hits the inner hole of the tapered die 104. At this time, the support spindle 101 can no longer move, and the spring 106 is squeezed. The closing support surface 103 is at the closing extrusion surface 105.

[0022] Step 2: Place the cover-like parts to be processed between the closing support surface 103 and the closing extrusion surface 105.

[0023] Step 3: If machining on a lathe, place the tail of the tapered die 104 on the lathe, then use a three-jaw chuck to hold the tapered die 104, and use the tailstock of the lathe to push the cover-like parts and the support mandrel 101 into the tapered die 104; if machining by a fitter, place the tapered die 104 flat on a drilling machine, and use the drilling machine to press the cover-like parts and the support mandrel 101 into the tapered die 104.

[0024] Step 4: The inverted cone die 104 is calculated for the specific size of the cover-type part. After being pushed in, it stops when a large resistance is felt. After being pushed in, it is held for 30-60 seconds and then released. The part is automatically ejected under the action of the spring 106. The operator collects the part, removes the burrs, checks the dimensions, and completes the processing.

[0025] The inverted conical die 104 designed in this case enables the processing of cover-type parts to no longer be limited to turning; fitters can also use this tooling to process them, greatly improving processing efficiency. Compared with the original closing die, the inverted conical closing die has a significantly improved one-time forming pass rate and a continuously decreasing rework rate during use. Currently, the parts do not require rework after processing, and the processed parts have a high degree of conformity with the product drawings.

[0026] Example 2:

[0027] This embodiment further defines the closing extrusion surface 105 based on the above embodiment, specifically as follows: Figure 1 As shown, the taper of the tapered extrusion surface 105 is 1° ± 0.1°. In this embodiment, the taper of the tapered extrusion surface 105 is selected based on the type of cover being processed; however, the taper can be adaptively selected for different part processing requirements.

[0028] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0029] Example 3:

[0030] This embodiment further defines the closing support surface 103 and the closing extrusion surface 105 based on the above embodiment, specifically as follows: Figure 1 As shown, the surface roughness of both the closing extrusion surface 105 and the closing support surface 103 is 0.4 micrometers. This surface roughness is one that results in lower processing costs while meeting the standards for processing cover-type parts. If the roughness level is reduced, the processing requirements for cover-type parts cannot be met; while if the roughness level is increased, the manufacturing cost will increase.

[0031] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0032] Example 4:

[0033] This embodiment further defines the support mandrel 101 and the inverted conical mold 104 based on the above embodiment. For the support mandrel 101, considering that wear during use will affect the service life, and that the specific dimensions need to be adjusted according to the part size and the ductility of the part material, the material of the support mandrel 101 is 50CrVA, and the hardness after heat treatment is HRC45-51.

[0034] For the inverted conical die 104, only some parts have high wear and service life requirements, while the hardness requirements for heat treatment in other parts can be relatively reduced. Therefore, 1Cr11Ni2W2MoV carburizing is used at the end extrusion surface 105, with a hardness of HRC58-62, while the hardness of the other non-carburized surfaces on the inverted conical die 104 is HRC35-41.

[0035] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0036] Example 5:

[0037] This embodiment further defines the inverted cone mold 104 based on the above embodiment, specifically as follows: Figure 1 As shown, the head diameter of the inverted cone mold 104 is larger than the tail diameter, and a chamfer is provided at the end of the head of the inverted cone mold 104.

[0038] By reducing the tail diameter, the volume, weight, and material cost of the tapered die 104 are effectively reduced. The chamfer is designed to make way for the machine tool and prevent interference during machining.

[0039] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A tapered end-forming die, characterized in that: The device includes a support mandrel (101), a tapered die (104), a spring (106), and a tail cap (107). The tapered die (104) includes a head and a tail. The tapered die (104) has a through hole along the axial direction. The through hole at the head is provided with a tapered extrusion surface (105). The tapered extrusion surface (105) is an inner conical surface. The diameter of the inner conical surface on one side of the end of the tapered die (104) is larger than that on the other side. The support mandrel (101) is provided with a limiting step (102) and a closing support surface (103). The closing support surface (103) cooperates with the closing extrusion surface (105) to close the part. The limiting step (102) is used to limit the support mandrel (101). The support spindle (101) is slidably connected in the through hole of the inverted cone mold (104), the tail cap (107) is installed in the through hole of the inverted cone mold (104), and the spring (106) is disposed between the support spindle (101) and the tail cap (107).

2. The inverted conical surface closing mold according to claim 1, characterized in that: The taper of the closing extrusion surface (105) is 1°±0.1°.

3. The inverted conical surface closing mold according to claim 1, characterized in that: The surface roughness of both the closing extrusion surface (105) and the closing support surface (103) is 0.4 micrometers.

4. The inverted conical surface closing mold according to claim 1, characterized in that: The support mandrel (101) is made of 50CrVA and has a hardness of HRC45-51 after heat treatment; the inverted conical die (104) is carburized with 1Cr11Ni2W2MoV at the end of the extrusion surface (105) and has a hardness of HRC58-62, while the hardness of the other non-carburized surfaces on the inverted conical die (104) is HRC35-41.

5. The inverted conical surface closing mold according to claim 1, characterized in that: The diameter of the head of the inverted cone mold (104) is larger than the diameter of the tail, and a chamfer is provided at the end of the head of the inverted cone mold (104).

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