Tool for PVD coating of precision broach
By designing a precision broach PVD coating tool and using a multi-clamp and shielding structure to adjust the electric field distribution, the problems of uneven coating thickness and tip effect were solved, achieving uniform coating deposition and cost savings.
Patent Information
- Application Number
- CN202423050713.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-11
AI Technical Summary
In the precision broaching process, uneven coating thickness and tip effect can lead to dimensional deviations, affecting machining accuracy and cost.
A precision broach PVD coating fixture is designed, which adopts multiple clamps and a shielding structure. The broach is fixed by clamps and the electric field distribution is adjusted by shielding to reduce electric field concentration and achieve uniform coating deposition.
It improves the uniformity and thickness consistency of the coating, reduces coating costs, and enhances processing accuracy and product competitiveness.
Smart Images
Figure CN223646622U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of precision broach PVD coating, and particularly to a precision broach PVD coating tool. BACKGROUND
[0002] PVD technology appeared in the late 1970s, and the prepared thin film has the advantages of high hardness, low friction coefficient, good wear resistance and chemical stability. At present, PVD coating technology has been widely used in the coating treatment of hard alloy, high speed steel and other materials such as end mill, drill, step drill, oil hole drill, reamer, tap, indexable milling blade, special-shaped tool and welded tool.
[0003] The broach is a kind of cutting tool, which is used for broaching. There are multiple rows of teeth on the surface of the tool, and the size and shape of each row of teeth increase and change from the cutting-in end to the cutting-out end. When the broach moves, each tooth cuts a certain thickness of metal from the workpiece, and finally obtains the required size and shape. Due to the excellent wear resistance and low friction performance of PVD coating, broach coating is also more and more widely used.
[0004] When part of the broach is processed, due to the precise size requirement, such as the requirement that the groove type size tolerance is within 0.002mm, the size control of the broach edge is extremely strict, and the broach edge is prone to have a thick coating due to the coating accumulation tip effect.
[0005] Therefore, it is urgent to use a suitable tool to optimize the coating thickness of the broach. CONTENT OF THE INVENTION
[0006] The present application aims to provide a precision broach PVD coating tool to solve the problems in the background art.
[0007] To achieve the above-mentioned purpose, the present application provides a precision broach PVD coating tool, which adopts the following technical scheme:
[0008] A precision broach PVD coating tool, comprising a rotary table, a positioning column is vertically fixed in the middle of the rotary table, a plurality of clamps for mounting the broach are uniformly arranged on the side of the positioning column, the clamp comprises a C-shaped frame body and a supporting plate, the supporting plate is fixed at the opening of the C-shaped frame body, the C-shaped frame body is provided with a placing groove for placing the broach from top to bottom, a plurality of fastening screws are uniformly arranged on the side of the C-shaped frame body, the fastening screws can tightly fix the broach in the placing groove, an adjusting groove is arranged at the top of the main body of the C-shaped frame, the shutter plate is obliquely movably arranged in the C-shaped frame, a locking screw is threadedly connected to the top of the shutter plate, the locking screw is threadedly connected to the shutter plate through the adjusting groove, and the bottom end of the shutter plate is matched and arranged in the placing groove.
[0009] Preferably, the rotating table surface is uniformly provided with a plurality of positioning grooves, the bottom end of the C-shaped frame is matched with the positioning grooves, the top end of the positioning column is threadedly connected with a locking piece, and the top of the C-shaped frame body is provided with an arc-shaped wedge block on one side close to the positioning column.
[0010] The locking piece comprises a thread segment and a ring segment which are integrally formed, the thread segment is threadedly connected with the positioning column, and the cross section of the ring segment is a slope matched with the arc-shaped wedge block.
[0011] By adopting the above technical scheme, the drawbars are stacked in the C-shaped frame in use, and then the drawbars are fastened by fastening screws. After adjusting the position of the shutter, the whole is pushed into the rotating table along the positioning grooves, and then the six clamps are installed on the rotating table. Then, the locking piece is rotated, and the ring segment at the bottom of the locking piece can be clamped on the arc-shaped wedge block at the top of the C-shaped frame, so that the plurality of clamps can be fixed on the rotating table.
[0012] The six clamps and the drawbars in the clamps can be stacked and clamped, which greatly improves the loading capacity and saves the coating cost.
[0013] Preferably, in order to facilitate the placement of a wrench, the cross section of the thread segment is hexagonal.
[0014] The number of the clamps is six.
[0015] In summary, the present application has at least one of the following beneficial technical effects:
[0016] 1. By providing a plurality of clamps, a plurality of drawbars can be stacked in each clamp, and the drawbars are fixed in the clamps by the fastening screws on the side, which improves the clamping quantity, reduces the coating cost, and improves the competitiveness of the coating product.
[0017] 2. By providing a shutter, the shutter is used in cooperation with the clamps. In the PVD process, the shutter can effectively adjust the electric field distribution, reduce the concentration of the electric field at the tip or edge, thereby reducing the excessive coating of the tip area, homogenizing the deposition process of the coating, reducing the influence of the tip effect, and ensuring the uniformity and thickness consistency of the coating on the surface of the drawbar. BRIEF DESCRIPTION OF DRAWINGS
[0018] Fig. 1 is a whole structure schematic diagram of the embodiment of the present application.
[0019] Fig. 2 is a structure schematic diagram for embodying the clamp in the embodiment of the present application.
[0020] Fig. 3 is a structure schematic diagram for embodying the locking piece in the embodiment of the present application.
[0021] Explanation of reference signs: 1, rotary table; 11, positioning column; 12, positioning groove; 2, clamp; 21, C-shaped frame body; 211, placing groove; 22, shutter; 23, support plate; 24, fastening screw; 25, adjusting groove; 26, locking screw; 27, arc-shaped wedge block; 3, locking piece; 31, annular segment. DETAILED DESCRIPTION
[0022] The following will be described in detail in combination with the accompanying drawings. Figs. 1-3 The present application is further described in detail.
[0023] The present application discloses a precision broach PVD coating tool, referring to Figs. 1-2 , including a rotary table 1, a positioning column 11 is vertically fixed in the middle of the rotary table 1, six clamps 2 for installing broaches are uniformly arranged on the side of the positioning column 11, the clamp 2 includes a broach holder and a shutter 22, the broach holder includes a C-shaped frame body 21 and a support plate 23, the support plate 23 is fixed at the opening of the C-shaped frame body 21, the C-shaped frame body 21 is provided with a placing groove 211 for placing the broach from top to bottom, a plurality of fastening screws 24 are uniformly arranged on the side of the C-shaped frame body 21, the fastening screws 24 can tightly fix the broach in the placing groove 211, the main body of the C-shaped frame is provided with an adjusting groove 25 at the top, the shutter 22 is obliquely movably arranged in the C-shaped frame, the top of the shutter 22 is threadedly connected with a locking screw 26, the locking screw 26 is threadedly connected to the shutter 22 through the adjusting groove 25, and the bottom end of the shutter 22 is matched and arranged in the placing groove 211.
[0024] Referring to Figs. 1-3 , six positioning grooves 12 are uniformly arranged on the surface of the rotary table 1, the bottom end of the C-shaped frame is matched with the positioning groove 12, the top end of the positioning column 11 is threadedly connected with a locking piece 3, the side of the top of the C-shaped frame body 21 close to the positioning column 11 is provided with an arc-shaped wedge block 27, a plurality of C-shaped frame bodies 21 are fastened to the positioning column 11 through the locking piece 3, the locking piece 3 includes an integrally formed threaded segment and an annular segment 31, the threaded segment is threadedly connected to the positioning column 11, the cross section of the annular segment 31 is a slope matched with the arc-shaped wedge block 27, and the cross section of the threaded segment is a hexagon.
[0025] In use, the broaches are stacked up and down in the C-shaped frame, then the broaches are fastened through the fastening screws 24, after adjusting the position of the shutter 22, the whole is pushed into the rotary table 1 along the positioning groove 12, and then the six clamps 2 are arranged on the rotary table 1, and then the locking piece 3 is rotated, the annular segment 31 at the bottom of the locking piece 3 can be clamped on the arc-shaped wedge block 27 at the top of the C-shaped frame, so that the plurality of clamps 2 can be fixed to the rotary table 1.
[0026] The six clamps 2 and the broaches in the clamps 2 can be stacked up and down and clamped, which greatly improves the furnace loading capacity, thereby saving the coating cost.
[0027] The implementation principle of the precision broach PVD coating tool according to an embodiment of the application is as follows:
[0028] The principle of PVD coating is that under the action of negative bias, plasma is generated on the surface of the workpiece to react and deposit to form a dense coating, thereby achieving the effect of increasing the wear resistance of the workpiece. However, during the PVD coating process, especially when using a direct current power supply, the electric field intensity will be concentrated at the sharp edges or corners. This leads to a higher deposition rate of the coating at the tip or edge of the workpiece, forming a thicker coating, while the deposition rate in the flat area is relatively low. The tip effect is due to the concentration of the electric field in the sharp area, so that these areas obtain more material deposition than the flat area.
[0029] For some precision parts, size out-of-tolerance will cause the workpiece to be scrapped, resulting in waste. At this time, the tool shielding is needed to avoid the size out-of-tolerance caused by the tip effect.
[0030] When in use, the multiple broaches are placed in the same direction along the placement groove 211, and the broaches are fastened by the fastening screw 24, so that they are firmly and stably installed on the clamp 2. Then, the position of the shutter 22 is adjusted so that it is close to the blade edge of the broach, and the shutter 22 is fixed by the locking screw 26. During the subsequent PVD process, the shutter 22 can effectively adjust the electric field distribution and reduce the concentration of the electric field at the tip or edge, thereby reducing the excessive coating of the tip area, uniformizing the deposition process of the coating, reducing the influence of the tip effect, and ensuring the uniformity and thickness consistency of the coating on the surface of the broach.
[0031] The above are preferred embodiments of the application, and do not limit the protection scope of the application. Therefore, any equivalent changes made on the basis of the structure, shape, and principle of the application should be covered within the protection scope of the application.
Claims
1. A precision broach PVD coating tool, comprising a rotary table (1), a positioning column (11) is vertically fixed in the middle of the rotary table (1), a plurality of clamps (2) for installing the broach are uniformly arranged on the circumferential side of the positioning column (11), characterized in that: Said clamp (2) comprises a tool holder and a shutter (22), the tool holder comprises a C-shaped holder body (21) and a support plate (23), the support plate (23) is fixed at the opening of the C-shaped holder body (21), the C-shaped holder body (21) is provided with a placing groove (211) for placing a broach from top to bottom, the C-shaped holder body (21) is uniformly provided with a plurality of fastening screws (24) on the side, the fastening screw (24) can tightly fix the broach in the placing groove (211), the main body of the C-shaped holder is provided with an adjusting groove (25) at the top, the shutter (22) is obliquely movably arranged in the C-shaped holder, the shutter (22) is threadedly connected with a locking screw (26) at the top, the locking screw (26) is threadedly connected on the shutter (22) through the adjusting groove (25), and the shutter (22) is matched and arranged at the bottom of the placing groove (211).
2. The precision broach PVD coating tooling of claim 1, wherein: Said rotary table (1) is uniformly provided with a plurality of positioning grooves (12) on the surface, the C-shaped holder is matched with the positioning groove (12) at the bottom, the positioning column (11) is threadedly connected with a locking piece (3) at the top, the C-shaped holder body (21) is provided with an arc-shaped wedge block (27) on one side near the positioning column (11) at the top, and a plurality of C-shaped holder bodies (21) are fastened on the positioning column (11) through the locking piece (3).
3. The precision broach PVD coating tooling of claim 2, wherein: Said locking piece (3) comprises an integrally formed threaded segment and an annular segment (31), the threaded segment is threadedly connected on the positioning column (11), and the cross section of the annular segment (31) is a bevel matched with the arc-shaped wedge block (27).
4. The precision broach PVD coating tooling of claim 3, wherein: The cross section of the threaded segment is hexagonal.
5. The precision broach PVD coating tooling of claim 1, wherein: The number of the clamps (2) is six.