Non-metal part outer circle straight grain knurling machining tool

Abstract

The utility model provides a non-metal part outer circle straight grain knurling machining tool which overcomes the defects that an existing non-metal part outer surface knurling forming mode is low in machining efficiency, the surface of a part is prone to elastic deformation, and the knurling size cannot be guaranteed. The tool comprises a knurling forming die and a core rod which are used in cooperation, and a slotting inner hole is formed in the knurling forming die; the slotting inner hole is a stepped through hole and comprises an upper inner hole and a lower inner hole which are coaxially arranged from top to bottom; the diameter of the upper inner hole is smaller than that of the lower inner hole; a circle of sharp and burr-free straight-line inner teeth are arranged on the hole wall, close to the lower inner hole, of the upper inner hole in the circumferential direction, and the length and the height of the straight-line inner teeth are matched with straight-line knurling parameters of the outer circle of the non-metal part to be machined; the core rod is a step shaft and comprises a first core shaft, a second core shaft and a third core shaft which are coaxially arranged from top to bottom.

Description

Technical Field

[0001] This utility model belongs to the field of tooling design technology, specifically relating to a tooling for machining straight knurling on the outer circle of non-metallic parts. Background Technology

[0002] like Figure 1-2 The parts shown are made of non-metallic materials (e.g., nylon 1010). Knurling (e.g., m0.3) needs to be machined onto the outer surface of the part, and the diameter of the outer circle where the knurling is located is the largest among the entire outer diameters of the part. Currently, the main methods for knurling the outer surface of such non-metallic parts include injection molding and knurling extrusion. Injection molding involves injecting molten plastic into a mold under pressure, which then cools and solidifies to obtain injection molded parts of various shapes. However, for small batches of parts, injection molding has the disadvantages of requiring high-temperature melting equipment to melt the plastic, designing specialized molds, and altering material properties after high-temperature melting, resulting in high overall costs and low efficiency. While knurling extrusion is low-cost, its disadvantages are also significant. During the knurling extrusion process, the part surface is prone to elastic deformation, making it impossible to guarantee the knurling dimensions.

[0003] Therefore, this utility model believes it is necessary to design a tooling for knurling of such non-metallic parts. Summary of the Invention

[0004] The purpose of this utility model is to solve the technical problems of low processing efficiency, easy elastic deformation of the part surface, and inability to guarantee the knurling size when using the existing non-metallic part external surface knurling forming method, and to provide a tooling for processing straight knurling on the outer circle of non-metallic parts.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A tooling for knurling the outer diameter of non-metallic parts is characterized by including a knurling forming mold and a mandrel used in conjunction with it.

[0007] The knurling die is provided with a cutting inner hole; the cutting inner hole is a stepped through hole, including an upper inner hole and a lower inner hole arranged coaxially from top to bottom; the diameter of the upper inner hole is smaller than the diameter of the lower inner hole, and the diameter of the upper inner hole is adapted to the maximum outer diameter of the non-metallic part to be processed, ensuring that the non-metallic part to be processed can be placed in without shaking; the upper inner hole near the lower inner hole has a ring of sharp, burr-free straight-lined internal teeth along the circumferential direction, and the length and height of the straight-lined internal teeth are consistent with the outer diameter of the non-metallic part to be processed. The knurling parameters are matched (i.e., a ring of straight knurled internal teeth is designed in the upper inner hole according to the knurling parameters of the outer circle of the non-metallic part to be processed, and the straight knurled internal teeth must be sharp and burr-free); the length of the upper inner hole is greater than the sum of the length of the straight knurled internal teeth and the height of the non-metallic part to be processed, so that the non-metallic part to be processed can be stably placed in; based on the above design, the diameter of the lower inner hole is greater than the maximum outer circle size of the non-metallic part to be processed, so that it can be removed from the lower inner hole after the straight knurling of the outer circle of the non-metallic part is completed;

[0008] The mandrel is a stepped shaft, comprising, from top to bottom, mandrel one, mandrel two, and mandrel three coaxially arranged;

[0009] Among them, the three diameters of the mandrel are matched with the diameter of the upper inner hole, and the length is sufficient to be able to cooperate with the knurling forming mold to cut straight knurling on the outer circle of the non-metallic part to be processed.

[0010] The diameter of mandrel two is greater than the diameter of mandrel three.

[0011] Furthermore, the knurling mold is cylindrical in shape.

[0012] Furthermore, to make the structure of the entire mandrel more balanced, the diameter of mandrel one is the same as the diameter of mandrel three; to make the force application more stable during inserting, the diameter of mandrel two is smaller than the outer diameter of the knurling die.

[0013] Furthermore, the length of the mandrel three is greater than the difference between the length of the upper inner hole and the height of the non-metallic part to be processed.

[0014] Furthermore, the knurling mold and the mandrel are both made of tool steel, alloy steel, or structural steel.

[0015] The advantages of this utility model are:

[0016] 1. This utility model abandons the conventional injection molding and knurling methods, and adopts a cutting method to process straight knurling on the outer diameter of non-metallic parts. Using this tooling, the straight knurling on the outer diameter of non-metallic parts can be formed in one step, which greatly improves the production efficiency of small batches of non-metallic parts.

[0017] 2. The processing tooling of this utility model is ingeniously designed, simple in structure, convenient to process and manufacture, easy to operate, has high knurling efficiency and stable quality, which not only reduces production costs, but also ensures product size and avoids elastic deformation caused by extrusion. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a non-metallic part;

[0019] Figure 2 for Figure 1 Top view of a non-metallic part;

[0020] Figure 3 This is a two-dimensional sectional view of the knurling tooling of this utility model;

[0021] Figure 4 This is a diagram showing the internal structure of the knurling tooling of this utility model.

[0022] In the diagram: 01-knurling; 1-mandrel; 11-mandrel one; 12-mandrel two; 13-mandrel three; 2-non-metallic part to be processed; 3-knurling forming mold; 31-pin inner hole; 32-knurling inner teeth. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] like Figure 3-4 As shown, a tooling for knurling the outer diameter of a non-metallic part includes a knurling die and a mandrel, both made of tool steel and used together.

[0025] The knurling mold is cylindrical in shape, with a coaxial insert hole inside. The insert hole is a stepped through hole, consisting of an upper inner hole and a lower inner hole arranged coaxially from top to bottom.

[0026] The diameter of the upper inner hole is smaller than that of the lower inner hole, and the diameter of the upper inner hole is adapted to the outer diameter of the non-metallic part to be processed. A ring of sharp, burr-free straight-knotted internal teeth is provided circumferentially on the hole wall of the upper inner hole near the lower inner hole. The length and height of the straight-knotted internal teeth are adapted to the straight-knotted knurling parameters of the outer diameter of the non-metallic part to be processed (that is, a ring of straight-knotted internal teeth is designed in the upper inner hole according to the straight-knotted knurling parameters of the outer diameter of the non-metallic part to be processed, and the straight-knotted internal teeth must be sharp and burr-free). In this way, it can not only ensure that the non-metallic part to be processed can be put in without shaking, but also facilitate the processing of the non-metallic part from falling out of the lower inner hole.

[0027] The mandrel is a stepped shaft, consisting of three coaxially arranged mandrels from top to bottom: mandrel one, mandrel two, and mandrel three. The diameter of mandrel three matches the diameter of the upper inner hole, and its length is greater than the difference between the length of the upper inner hole and the height of the non-metallic part to be processed. This allows it to work with the knurling die to cut straight knurling on the outer diameter of the non-metallic part. To make the entire mandrel more stable and balanced when force is applied, the diameter of mandrel two is greater than the diameter of mandrel three but smaller than the outer diameter of the knurling die. The diameter of mandrel one is the same as the diameter of mandrel three.

[0028] Instructions for using the above tooling:

[0029] 1. Place the non-metallic parts to be processed 2 according to... Figure 3 The material is placed into the knurling mold 3 from top to bottom.

[0030] 2. Press the mandrel 1. Figure 3 Place it into the knurling mold 3.

[0031] 3. Figure 3 The assembled fixture is placed directly beneath a manual or hydraulic press.

[0032] 4. By pressing the mandrel 1 downwards, the outer circle of the non-metallic part 2 to be processed passes through the straight knurled inner teeth in the knurling forming mold 3, and the required straight knurling can be cut out.

[0033] This type of machining tooling can be applied to, for example Figure 1-2 For non-metallic parts with straight knurling at the outermost diameter, as shown, the machining tooling dimensions can be redesigned according to the machining object, which can greatly improve machining efficiency and quality.

[0034] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. A tooling for machining straight knurling on the outer diameter of non-metallic parts, characterized in that: This includes the knurling mold and mandrel used in conjunction with it; The knurling die is provided with a cutting inner hole; the cutting inner hole is a stepped through hole, including an upper inner hole and a lower inner hole arranged coaxially from top to bottom; the diameter of the upper inner hole is smaller than the diameter of the lower inner hole, and the diameter of the upper inner hole is adapted to the maximum outer diameter of the non-metallic part to be processed, ensuring that the non-metallic part to be processed can be placed in without shaking; a ring of sharp, burr-free straight-lined internal teeth is provided circumferentially on the hole wall of the upper inner hole near the lower inner hole, and the length and height of the straight-lined internal teeth are adapted to the straight-lined knurling parameters of the outer diameter of the non-metallic part to be processed; the length of the upper inner hole is greater than the sum of the length of the straight-lined internal teeth and the height of the non-metallic part to be processed; The mandrel is a stepped shaft, comprising, from top to bottom, mandrel one, mandrel two, and mandrel three coaxially arranged; Among them, the three diameters of the mandrel are matched with the diameter of the upper inner hole, and its length is sufficient to cooperate with the knurling forming mold to cut straight knurling on the outer circle of the non-metallic part to be processed. The diameter of mandrel two is greater than the diameter of mandrel three.

2. The tooling for machining straight knurling on the outer diameter of non-metallic parts according to claim 1, characterized in that: The knurling mold is cylindrical in shape.

3. The tooling for machining straight knurling on the outer diameter of non-metallic parts according to claim 2, characterized in that: The diameter of mandrel one is the same as the diameter of mandrel three; The diameter of the second mandrel is smaller than the outer diameter of the knurling mold.

4. The tooling for machining straight knurling on the outer diameter of non-metallic parts according to claim 3, characterized in that: The length of the mandrel three is greater than the difference between the length of the upper inner hole and the height of the non-metallic part to be processed.

5. The tooling for machining straight knurling on the outer diameter of non-metallic parts according to claim 4, characterized in that: The knurling mold and mandrel are made of tool steel, alloy steel or structural steel.

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