A valve rod machining tool

Abstract

The utility model provides a valve rod processing frock, including clamping rod, its front end is equipped with the clamping hole of penetrating upside and downside, and the valve rod lower extreme is inserted and realizes the circumferential fixed; Clamping rod upside is equipped with the installation surface and valve rod step abuts, downside is equipped with locking surface, realizes axial fixed through locking nut and valve rod screw joint; The rear end is equipped with fixed link and machine tool connection, the front end is equipped with the fixed hole and the slot, and the bolt screw tight makes the slot both sides contract and clamp the valve rod; The rear end upside is equipped with vertical abutment surface and step outside surface abutment. This frock passes through the valve rod of circumferential and axial multidimensional fixed valve rod, and the valve rod is immobile when processing, and cutting knife moves, and the abutment surface resists the cutting impact force, solves the problem that two faces are not parallel in the existing processing, guarantees that surface A and surface B are parallel, improves the processing stability and precision.

Description

Technical Field

[0001] This utility model relates to the field of valve stem processing technology, and specifically to a valve stem processing tooling. Background Technology

[0002] In the field of machining, the valve stem is a key component of the valve, and its machining accuracy directly affects the valve's sealing performance and reliability.

[0003] refer to Figure 1 As shown, there is an existing type of valve stem 01. The upper end of the valve stem 01 forms a step 02, and the lower end of the valve stem 01 is provided with an external thread 03. The upper end of the valve stem 01 needs to be machined on its left and right sides to produce parallel surfaces A and B.

[0004] One existing machining method involves clamping and fixing the valve stem before machining surfaces A and B separately. In practice, surface A is often machined first, followed by rotating the valve stem to machine surface B. However, this method has a significant drawback: during valve stem rotation, positional errors can easily lead to non-parallelism between the machined surfaces A and B. This not only affects the assembly accuracy of the valve stem but may also cause valve seal failure due to insufficient precision, ultimately impacting the normal operation of the entire fluid control system. Utility Model Content

[0005] In view of the problems pointed out in the background art, this utility model proposes a valve stem machining tooling to solve the above-mentioned technical problems.

[0006] The technical solution of this utility model is implemented as follows: A valve stem machining fixture includes a clamping rod, the front end of which is provided with clamping holes extending through its upper and lower sides, and the upper side of the clamping rod forming a horizontally set mounting surface corresponding to the position of the clamping holes, and also includes a locking nut.

[0007] The present invention is further provided that the rear end of the clamping rod is provided with a rearwardly extending fixing rod.

[0008] The present invention is further configured such that the front end of the clamping rod is provided with a slot that runs through its upper and lower sides and front side, and the slot communicates with the clamping hole; it also includes a fixing hole that runs through the left and right sides of the clamping rod, the fixing hole passes through the slot, and a bolt is connected to the fixing hole by thread.

[0009] The present invention is further configured such that the diameter of the fixing rod is smaller than the diameter of the clamping rod.

[0010] The present invention is further configured such that a horizontally arranged locking surface is formed on the lower side of the clamping rod corresponding to the position of the clamping hole.

[0011] The present invention is further configured such that a vertically arranged abutment surface is formed on the upper side of the rear end of the clamping rod.

[0012] By adopting the above technical solution, the beneficial effects of this utility model are as follows: The valve stem is clamped and fixed circumferentially using clamping holes, and the locking nut, utilizing the valve stem's own threaded structure, locks and fixes the valve stem axially. This ensures the valve stem is stably and securely clamped and fixed. When machining the upper end of the valve stem, the clamped valve stem remains stationary while the cutting tool moves to cut both sides of the valve stem, producing surfaces A and B. Because the valve stem remains stationary and the cutting tool's position and angle are easily controlled, deviations are less likely, ensuring that surfaces A and B remain parallel.

[0013] The horizontally positioned mounting and locking surfaces help to lock the valve stem axially after the lock nut is tightened.

[0014] The contact surface faces the feed direction of the cutting tool, which can resist the impact force generated by the cutting tool during cutting, making the machining process more stable and reliable. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the existing technology.

[0017] Figure 2 This is a schematic diagram of the tooling of this utility model.

[0018] Figure 3 This is an exploded view of the tooling of this utility model. Figure 1 .

[0019] Figure 4 This is an exploded view of the tooling of this utility model. Figure 2 .

[0020] Figure 5 This is a schematic diagram of the tooling used to clamp the valve stem according to this utility model.

[0021] Figure 6 This utility model Figure 6 Cross-section Figure 1 .

[0022] Figure 7 This utility model Figure 6 Cross-section Figure 2 .

[0023] The following are the labels in the attached diagram: Clamping rod 1, Clamping hole 2, Mounting surface 3, Locking nut 4, Fixing rod 5, Slot 6, Fixing hole 7, Bolt 8, Locking surface 9, Abutting surface 10. Detailed Implementation

[0024] 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.

[0025] For reference as follows Figures 1-7 The present invention will be described as follows: Example: A valve stem machining fixture includes a clamping rod 1, which is the main structure. The front end of the clamping rod 1 has clamping holes 2 extending through its upper and lower sides. The lower end of the valve stem 01 is inserted into the clamping holes 2, forming a clamping and fixing mechanism around the valve stem 01. The diameter of the clamping holes 2 is equal to the diameter of the valve stem 01.

[0026] A horizontally positioned mounting surface 3 is formed on the upper side of the clamping rod 1, corresponding to the position of the clamping hole 2. When the valve stem 01 is inserted into the clamping hole 2, the bottom surface of the step 02 at its upper end forms a surface contact fit with the mounting surface 3. This surface contact achieves the upper limit of the valve stem 01 in the axial direction, ensuring that the machined parts (surface A and surface B) of the valve stem 01 maintain a fixed axial position relative to the clamping rod 1.

[0027] A horizontally positioned locking surface 9 is formed on the lower side of the clamping rod 1, corresponding to the position of the clamping hole 2.

[0028] It also includes a locking nut 4, which is connected to the external thread 03 at the lower end of the clamping rod 1. When the locking nut 4 is tightened, the upper end face of the nut contacts the locking surface 9 and generates axial pressure. This pressure is transmitted to the valve stem 01 through the clamping rod 1, making the contact between the step 02 and the mounting surface 3 more compact, thereby forming a bidirectional limiting structure in the axial direction.

[0029] Compared to traditional machining methods that require manual rotation of the valve stem, this fixture achieves one-time positioning and fixing of the valve stem 01 through circumferential fixation via clamping hole 2 and axial positioning structure of mounting surface 3, locking surface 9, and locking nut 4. This eliminates the need to rotate the valve stem during machining, avoiding positioning errors caused by secondary clamping, and structurally eliminates the problem of non-parallelism between surfaces A and B. In traditional machining, valve stem rotation requires manual positioning, which can easily lead to angular deviations during secondary clamping, resulting in parallelism errors between surfaces A and B. This fixture, however, uses a machining method where the valve stem is fixed and the cutting tool moves. The CNC cutting tool has high positioning accuracy and a controllable movement trajectory, ensuring the parallelism of surfaces A and B.

[0030] The rear end of the clamping rod 1 is provided with a rearwardly extending fixing rod 5. The diameter of the fixing rod 5 is smaller than the diameter of the clamping rod 1, forming a stepped shaft structure. The fixing rod 5 is used for fixed connection with the machine tool jaws or for connection with other fixing devices, so as to fix the clamping rod 1. When the clamping rod 1 is fixed, its mounting surface 3 is in a horizontal state.

[0031] The connection between the fixed rod 5 and the machine tool jaws adopts a universal three-jaw chuck clamping method.

[0032] The clamping rod 1 has a slot 6 extending through its upper, lower, and front sides, which communicates with the clamping hole 2. It also includes fixing holes 7 extending through the left and right sides of the clamping rod 1, passing through the slot 6, and threaded bolts 8 are connected to the fixing holes 7. After the valve stem 01 is inserted into the clamping hole 2, the bolts 8 are tightened, and the clamping rod 1 on both sides of the slot 6 retracts to clamp and fix the valve stem 01. One fixing block 7 on each side of the slot 6 has a smooth hole and the other has a threaded hole; the bolts 8 are inserted through the smooth hole.

[0033] The presence of slot 6 divides the front end of clamping rod 1 into two elastic arms, left and right. When bolt 8 is tightened, the elastic arms undergo centripetal contraction displacement, forming a clamping and fixing mechanism.

[0034] A vertically arranged abutment surface 10 is formed on the upper side of the rear end of the clamping rod 1. The outer side of the step 02 abuts against the abutment surface 10.

[0035] The normal direction of the contact surface 10 is consistent with the feed direction of the cutting tool (assuming the cutting tool feeds along the positive X-axis, the contact surface 10 is perpendicular to the X-axis). This design allows the cutting impact force F to be transmitted along the normal direction of the contact surface 10, acting directly on the main structure of the clamping rod 1, avoiding the impact force from being transmitted to the clamping structure through the valve rod 01, and reducing elastic deformation.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A valve stem machining fixture, comprising a clamping rod, characterized in that: The clamping rod has clamping holes extending through its upper and lower sides at its front end. The upper side of the clamping rod forms a horizontal mounting surface corresponding to the position of the clamping holes. It also includes a locking nut. The clamping rod has a slot extending through its upper, lower, and front sides, and the slot communicates with the clamping holes. It also includes fixing holes extending through the left and right sides of the clamping rod. The fixing holes pass through the slots, and bolts are threaded into the fixing holes.

2. The valve stem machining fixture according to claim 1, characterized in that: The rear end of the clamping rod is provided with a rearwardly extending fixing rod.

3. The valve stem machining fixture according to claim 2, characterized in that: The diameter of the fixing rod is smaller than the diameter of the clamping rod.

4. The valve stem machining fixture according to claim 1, characterized in that: The lower side of the clamping rod forms a horizontally positioned locking surface corresponding to the position of the clamping hole.

5. The valve stem machining fixture according to claim 1, characterized in that: The upper side of the rear end of the clamping rod forms a vertically arranged abutment surface.

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