A tool setting device for machining a positioning groove in a thin-walled projectile bore

Abstract

The present application provides a tool setting device for processing a positioning groove in a thin-walled projectile bore, comprising a positioning block, a positioning rod, a spring and a positioning seat, the top end of the positioning seat is processed into an arc shape; the rear end of the positioning block is fixed on the positioning seat by a screw, the front end of the positioning block is processed with a tool setting groove; the bottom end of the positioning seat is processed with a positioning rod installation blind hole, the spring and the positioning rod are installed in the positioning rod installation blind hole in sequence; the bottom end of the positioning rod is processed into a semispherical shape, the right side of the positioning rod is processed with a key groove, the cylindrical end of the screw is screwed into the key groove through the threaded hole on the side of the positioning seat, but does not contact the bottom plane of the key groove; the two ends of the spring are respectively abutted against the bottom of the positioning rod installation blind hole and the top end face of the positioning rod. By using the tool setting device, the positioning groove can be processed quickly and accurately without being affected by the diameter size change of the projectile bore, the depth size of the positioning groove is ensured, and the product design requirements are met.

Description

A tool setting device for machining positioning grooves in the bore of thin-walled projectiles Technical Field

[0001] This invention belongs to the field of mechanical cold working technology, specifically relating to a tool setting device for machining positioning grooves in the bore of thin-walled projectiles. Background Technology

[0002] For a certain type of projectile, a locating groove needs to be machined in the axial part of its bore to prevent a certain assembly component from rotating circumferentially within the projectile's bore. The depth of this locating groove is set to the distance from the upper wall of the projectile's bore to the bottom of the groove, which includes the bore diameter. During the research and development phase of production, a cylindrical milling cutter is installed on specialized equipment, and the milling depth is controlled using the lower wall of the projectile's bore as a reference, indirectly ensuring the product's design dimensions. However, due to variations in the bore diameter, this dimension is difficult to control effectively, resulting in a yield rate of only 65%. To control the locating groove depth, meet product design requirements, and improve the yield rate, a tool-setting device for machining the locating groove in the projectile's bore needs to be designed and used in mass production after the product design is finalized. This device will effectively control the milling depth and improve the yield rate. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] This invention proposes a tool setting device for machining positioning grooves in the bore of thin-walled projectiles, in order to solve the technical problem of how to control the milling depth of the positioning groove, ensure the depth dimension of the positioning groove, and improve the yield rate.

[0005] (II) Technical Solution

[0006] To address the aforementioned technical problems, this invention proposes a tool-setting device for machining positioning grooves in the bore of thin-walled projectiles. The tool-setting device includes a positioning block, a positioning rod, a spring, and a positioning seat. The top of the positioning seat is machined into an arc shape. The rear end of the positioning block is fixed to the positioning seat with screws, and the front end of the positioning block has a tool-setting groove. The bottom end of the positioning seat has a blind hole for mounting the positioning rod, and the spring and positioning rod are sequentially installed within this blind hole. The bottom end of the positioning rod is machined into a hemispherical shape, and a keyway is machined on the right side of the positioning rod. The cylindrical end of the screw is screwed into the keyway through a threaded hole on the side of the positioning seat, but does not contact the bottom plane of the keyway. The two ends of the spring rest against the bottom of the blind hole for mounting the positioning rod and the top surface of the positioning rod, respectively.

[0007] Furthermore, the radius of the arc at the top of the positioning seat is the minimum limit dimension of the bore radius of the projectile.

[0008] Furthermore, the tool groove is machined using the arc surface on the positioning seat as a reference.

[0009] Furthermore, the distance from the bottom of the groove to the highest point of the arc surface is the middle limit of the depth of the positioning groove in the missile's bore, and the groove width is greater than the diameter of the cylindrical milling cutter.

[0010] Furthermore, a tool setting edge is machined on the right side of the positioning groove.

[0011] Furthermore, the positioning block, positioning rod, and positioning seat are made of T10A tool steel.

[0012] Furthermore, the hardness requirement for T10A tool steel after heat treatment is HRC58~62.

[0013] (III) Beneficial Effects

[0014] This invention proposes a tool setting device for machining positioning grooves in the bore of thin-walled projectiles, comprising a positioning block, a positioning rod, a spring, and a positioning seat. The top of the positioning seat is machined into an arc shape. The rear end of the positioning block is fixed to the positioning seat by a screw, and the front end of the positioning block is machined with a tool setting groove. The bottom end of the positioning seat is machined with a blind hole for mounting the positioning rod, and the spring and the positioning rod are sequentially installed in the blind hole. The bottom end of the positioning rod is machined into a hemispherical shape, and a keyway is machined on the right side of the positioning rod. The cylindrical end of the screw is screwed into the keyway through a threaded hole on the side of the positioning seat, but does not contact the bottom plane of the keyway. The two ends of the spring rest against the bottom of the blind hole for mounting the positioning rod and the top surface of the positioning rod, respectively. By using the tool setting device of the present invention, the positioning groove can be machined quickly and accurately without being affected by changes in the diameter of the projectile bore, ensuring the depth of the positioning groove and meeting product design requirements. The present invention has a simple structure, low manufacturing cost, and long service life, and can meet the milling of more than 50,000 projectile bores. The design structure of the present invention is suitable for milling the bores of medium and large caliber projectiles, and can be applied and promoted in the shell manufacturing industry, with significant economic benefits and broad social benefits. Attached Figure Description

[0015] Figure 1a is a front sectional view of the projectile, and Figure 1b is an AA sectional view of Figure 1a.

[0016] Figure 2a is a front sectional view of the tool setting device structure of the present invention, and Figure 2b is a side view;

[0017] Figure 3 is a schematic diagram of the method of using the tool setting device of the present invention. Detailed Implementation

[0018] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0019] As shown in Figures 1a and 1b, a positioning groove needs to be machined in the axial part of the projectile's bore. The depth of the groove is set to the distance H from the upper wall of the projectile's bore to the bottom of the groove, which includes the bore diameter D. If the lower wall of the projectile's bore is used as a reference for machining dimension B, the product design dimension H can be indirectly guaranteed. However, due to the influence of changes in the bore diameter D, this dimension is difficult to control effectively.

[0020] This embodiment proposes a tool setting device for machining positioning grooves in the bore of thin-walled projectiles. Its structure is shown in Figures 2a and 2b. It mainly includes a positioning block 1, an internal hexagonal head screw 2, a positioning rod 3, a slotted cylindrical end set screw 4, a spring 5, and a positioning seat 6.

[0021] The top of the positioning seat 6 is machined into an arc shape, and the radius of the arc is the minimum limit dimension of the missile's bore radius. The rear end of the positioning block 1 is fixed to the positioning seat 6 by an internal hexagon head screw 2. The front end of the positioning block 1 is machined with a tool setting groove, which is machined based on the arc surface on the positioning seat 6. The distance h from the bottom of the tool setting groove to the highest point of the arc surface is the middle limit dimension H of the positioning groove depth dimension of the missile's bore. The groove width dimension B is slightly larger than the diameter dimension of the cylindrical milling cutter. A pair of cutting edges are machined on the right side of the positioning groove to facilitate observation of the tool setting situation.

[0022] The bottom end of the positioning seat 6 is machined with a blind hole for mounting the positioning rod. The spring 5 and the positioning rod 3 are sequentially installed in the blind hole. The bottom end of the positioning rod 3 is machined into a hemispherical shape, and a keyway is machined on the right side of the positioning rod 3. The cylindrical end of the slotted cylindrical set screw 4 is screwed into the keyway through the threaded hole on the side of the positioning seat 6, but does not contact the bottom surface of the keyway. The two ends of the spring 5 are respectively pressed against the bottom of the blind hole for mounting the positioning rod and the top surface of the positioning rod 3. Under the action of elastic force and external force, the spring 5 pushes the positioning rod 3 up and down, so that the positioning rod 3 and the positioning seat 6 can enter the inner cavity of the projectile and remain stable.

[0023] In this invention, the positioning block 1, the positioning rod 3, and the positioning seat 6 are all made of wear-resistant and pressure-resistant T10A tool steel, and the hardness requirement after heat treatment is HRC58~62.

[0024] As shown in Figure 3, the method of using the tool setting device of the present invention includes the following steps:

[0025] S1. Press the hemispherical bottom of the positioning rod 3 on the tool setting device downwards against the inner wall of the projectile, and then press it down with a little force while applying horizontal force. The spring 5 compresses the arc-shaped surface at the top of the positioning seat 6 into the inner cavity of the projectile. Since the radius of the arc-shaped surface of the positioning seat 6 is the minimum limit of the inner cavity radius of the projectile, most of the arc-shaped surface can contact the inner wall surface of the projectile. This ensures that the positioning groove on the positioning block 1 is at the centerline of the inner cavity of the projectile, and the bottom plane of the positioning groove is horizontal with the upper wall of the projectile. At this time, the h value is guaranteed to be the middle limit of the depth H of the positioning groove in the inner cavity of the projectile.

[0026] S2. Move the milling cutter holder to the right so that the cylindrical milling cutter fixed on the milling cutter holder enters the positioning groove from the left end of the positioning block 1 on the tool setting device and reaches the tool setting point. Then move the milling cutter holder down and observe the tool setting situation from the tool setting point. Make the lower end face of the cylindrical milling cutter rest on the bottom plane of the positioning groove of the positioning block 1. The tool setting is complete.

[0027] S3. After tool setting is completed, the tool setting device is removed from the missile's internal cavity, and then milling is performed.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A tool setting device for machining positioning grooves in the bore of a thin-walled projectile, characterized in that, The tool setting device includes a positioning block, a positioning rod, a spring, and a positioning seat. The top of the positioning seat is machined into an arc shape, and the radius of this arc is the minimum limit dimension of the projectile's bore radius. The rear end of the positioning block is fixed to the positioning seat with screws. The front end of the positioning block has a tool setting groove, which is machined based on the arc surface of the positioning seat. The distance from the bottom of the groove to the highest point of the arc surface is the middle limit dimension of the positioning groove depth in the projectile's bore, and the groove width is greater than the diameter of the cylindrical milling cutter. The bottom end of the positioning seat has a blind hole for mounting the positioning rod, and the spring and positioning rod are sequentially installed within this blind hole. The bottom end of the positioning rod is machined into a hemispherical shape, and a keyway is machined on the right side of the positioning rod. The cylindrical end of the screw is screwed into the keyway through a threaded hole on the side of the positioning seat, but does not contact the bottom plane of the keyway. The two ends of the spring rest against the bottom of the blind hole and the top surface of the positioning rod, respectively.

2. The tool setting device as described in claim 1, characterized in that, The right side of the positioning groove is machined with a cutting edge.

3. The tool setting device as described in claim 1, characterized in that, The positioning block, positioning rod, and positioning seat are made of T10A tool steel.

4. The tool setting device as described in claim 3, characterized in that, The required hardness of the T10A tool steel after heat treatment is HRC58~62.

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