Clamp for CNC machining of inner hole plane

Abstract

The utility model provides a clamp for CNC machining of an inner hole plane. Relates to the field of machining, and aims to solve the problem that the efficiency of workpiece clamping state detection and adjustment is low at present, an air pressure detection meter is arranged on an air pipe connected into a detection hole corresponding to each detection station, so that the air pressure change of each detection station is independently monitored; when air leakage is caused by unqualified clamping of a workpiece on a certain detection station, the air pressure detection meter of the corresponding detection hole can display obvious air pressure change, so that which station has a problem is accurately judged, the efficiency of correcting the clamping state of the workpiece is improved, and the working efficiency is improved. Repeated detection and debugging work caused by the fact that an air leakage station cannot be accurately recognized is avoided, the accuracy and reliability of air tightness detection of the clamp are enhanced, and the quality of CNC machining of the inner hole plane is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of machining, especially a kind of fixture for CNC machining inner hole plane. BACKGROUND

[0002] In the process of machining workpiece, workpiece needs to be clamped first before machining. If workpiece loosens during machining, it may lead to waste product, and more seriously, it may cause accident. In related technology, whether workpiece is clamped can be detected by air tightness. If workpiece is clamped in place, air tightness is good, and machine tool does not alarm. If clamping is unqualified, air leakage occurs, and pressure in air pipe drops more than set threshold, which will cause machine tool to alarm and stop machining.

[0003] A clamp air tightness detection device is disclosed in Chinese patent (publication number CN114370980B), which can clearly show air pressure change in air pipe when workpiece clamping is unqualified, and accurately determine whether workpiece clamping is qualified. However, all detection air pipes are connected to air source after merging, and it is difficult to identify which work station has clamping problem when air leakage occurs due to unqualified clamping, which leads to low efficiency when correcting workpiece clamping state. UTILITY MODEL CONTENT

[0004] The utility model aims at defects in prior art, and provides a kind of fixture for CNC machining inner hole plane, air pressure detection table is arranged on the air pipe connected to each detection hole, air pressure change of each detection station is monitored independently, when workpiece clamping in certain detection station is unqualified and leads to air leakage, air pressure detection table of corresponding detection hole will show obvious air pressure change, so as to accurately determine which work station has problem, improve the efficiency of correcting workpiece clamping state, avoid repeated detection and debugging work due to unable to accurately identify air leakage station, and the accuracy and reliability of clamp air tightness detection are enhanced, and the quality of CNC machining inner hole plane is improved.

[0005] To achieve the above purpose, the following technical scheme is adopted:

[0006] A kind of fixture for CNC machining inner hole plane, comprising:

[0007] Base body, equipped with multiple detection stations, detection station is equipped with the bearing surface of bearing workpiece;

[0008] Positioning pin, distributed in each detection station and installed on base body, one end of positioning pin protrudes from bearing surface, for cooperating with hole part opened on workpiece;

[0009] Pressing plate, installed on base body by telescopic part, end of pressing plate forms pressing surface towards bearing surface, and clamping part for accommodating workpiece is formed between bearing surface and pressing surface;

[0010] A detection hole is formed on the base, and the detection hole is open at one end of the bearing surface to seal the workpiece, and the other end is open to connect the gas pipe to the gas source. A gas pressure detector is arranged on the gas pipe connected to the detection hole of each detection station.

[0011] Further, a plurality of positioning holes are arranged on the bearing surface of each detection station, and the positioning pin is installed in the positioning hole away from the matched workpiece.

[0012] Further, the same group of positioning holes has two, and the two positioning holes in the same group are symmetrically distributed relative to the axis of the matched workpiece. At least one group of positioning holes of each detection station is matched with a positioning pin.

[0013] Further, all the positioning holes are distributed around the axis of the matched workpiece, and the sizes of different groups of positioning holes are different.

[0014] Further, the pressing plate forms a pressing surface at both ends, and the output end of the telescopic member is connected between the pressing surfaces at both ends of the pressing plate. The pressing surfaces at both ends of the pressing plate are matched with the bearing surfaces of different detection stations to form clamping parts.

[0015] Further, the opening of the detection hole at one end is located in the range of the bearing surface corresponding to the clamping part.

[0016] Further, the detection station is located between two detection stations.

[0017] Further, the bearing surface of each detection station forms two clamping parts distributed at intervals, and the two clamping parts are located on the opposite sides of the axis of the clamped workpiece.

[0018] Further, the detection hole is arranged in each of the two clamping parts formed by each detection station.

[0019] Further, each detection hole is connected with a gas pipe, and a gas pressure detector is arranged on the gas pipe.

[0020] Compared with the prior art, the utility model has the advantages and positive effects that:

[0021] In view of the problem of low efficiency of workpiece clamping state detection and adjustment, by arranging the gas pressure detector on the gas pipe connected to the detection hole of each detection station, the change of the gas pressure of each detection station is independently monitored. When the workpiece clamping of a detection station is unqualified and causes air leakage, the gas pressure detector of the corresponding detection hole will show obvious change of the gas pressure, so that it is accurately judged which station has problems, the efficiency of correcting the workpiece clamping state is improved, repeated detection and debugging work caused by failure to accurately identify the air leakage station are avoided, the accuracy and reliability of the clamp air tightness detection are improved, and the quality of the CNC machining inner hole plane is improved. Attached Figure Description

[0022] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0023] Figure 1 This is a schematic diagram of a fixture used for CNC machining of inner hole planes in an embodiment of this utility model.

[0024] Figure 2 This is a schematic diagram of the distribution of inspection holes in the fixture used for CNC machining of inner hole planes in an embodiment of this utility model.

[0025] In the figure, 1. Base; 2. Clamping part; 3. Telescopic part; 4. Clamping plate; 5. Pressing surface; 6. Bearing surface; 7. Inspection hole; 8. Air pipe; 9. Positioning pin; 10. Positioning hole; 11. Inspection station; 12. Workpiece. Detailed Implementation

[0026] In a typical embodiment of this utility model, such as Figures 1-2 As shown, a fixture for CNC machining of internal hole planes is proposed.

[0027] Existing fixture airtightness detection devices can determine the problem by detecting changes in air pressure when workpiece 12 is not properly clamped. However, their method of connecting all detection air pipes 8 to the air source makes it difficult to accurately identify which workstation is experiencing a leak, reducing the efficiency of correcting the workpiece 12's clamping status. Therefore, this embodiment provides a fixture for CNC machining of internal plane holes, aiming to solve the problem of inaccurate identification of leaking workstations in existing technologies.

[0028] CNC machining refers to precision machining controlled by computer digital control, and is applied to CNC lathes, CNC milling machines, CNC boring and milling machines, etc.

[0029] like Figure 1 As shown, the CNC machining fixture for internal planar holes includes a base 1, locating pins 9, and a pressure plate. The base 1 is the main structure of the fixture, and it has multiple inspection stations 11. Each inspection station 11 has a bearing surface 6 for bearing the workpiece 12 to be inspected. The locating pins 9 are distributed on each inspection station 11 and installed on the base 1 to maintain their positions. One end of the locating pin 9 protrudes from the bearing surface 6 and is used to mate with the hole on the workpiece 12 to ensure accurate positioning of the workpiece 12 on the bearing surface 6. The pressure plate is installed on the base 1 via a telescopic component 3 (such as a cylinder, hydraulic cylinder, etc.). The end of the pressure plate forms a pressing surface 5 facing the bearing surface 6, and a clamping part 2 is formed between the pressure plate and the bearing surface 6 for clamping the workpiece 12.

[0030] In addition, as shown in Figure 2 The base body 1 is also provided with detection holes 7, and each detection station 11 corresponds to at least one detection hole 7. One end of the detection hole 7 is open on the bearing surface 6, and when the workpiece 12 is placed on the bearing surface 6, the one end of the detection hole 7 is attached to the workpiece 12 and is blocked by the workpiece 12, forming an airtight detection area. The other end of the detection hole 7 is connected to the gas source through the gas pipe 8 for inflating the detection hole 7.

[0031] The gas pipe 8 connected to the detection hole 7 corresponding to each detection station 11 is provided with a gas pressure detection table. The gas pressure detection table is used to monitor the gas pressure change in each detection hole 7 in real time, so as to judge whether the clamping of the workpiece 12 is qualified.

[0032] In this embodiment, by arranging the gas pressure detection table on the gas pipe 8 connected to the detection hole 7 corresponding to each detection station 11, the gas pressure change of each detection station 11 is independently monitored. When the workpiece 12 on a certain detection station 11 is clamped unqualifiedly, causing air leakage, the gas pressure detection table of the corresponding detection hole 7 will show obvious gas pressure change, so as to accurately judge which station has the problem. The efficiency of correcting the clamping state of the workpiece 12 is improved, and repeated detection and debugging work caused by the inability to accurately identify the air leakage station is avoided; the accuracy and reliability of the clamp airtightness detection are enhanced, and the quality of the CNC machining inner hole plane is improved.

[0033] The relative positions and relationships of the positioning pin 9, the pressing plate, the detection hole 7, and the base body 1 and the workpiece 12 are described in detail.

[0034] The bearing surface 6 of each detection station 11 is provided with a plurality of groups of positioning holes 10 for installing the positioning pin 9, as shown in Figure 1 The positioning holes 10 are divided into three groups, the positioning pin 9 is detachably connected with the positioning hole 10, and the sizes of the positioning holes 10 in different groups can also be configured to be different, so as to adapt to different positioning pins 9 and hole parts on the workpiece 12. It can be understood that the distribution position of the positioning hole 10 matches the distribution position of the hole part on the workpiece 12 that can be positioned on the bearing surface 6.

[0035] The end of the positioning pin 9 away from the matching end of the workpiece 12 is installed in the positioning hole 10, ensuring the stability of the positioning pin 9. The same group of positioning holes 10 are provided with two, and are symmetrically distributed relative to the axis of the matched workpiece 12, ensuring the stable positioning of the workpiece 12 on the bearing surface 6.

[0036] Each detection station 11 has at least one set of positioning holes 10 matched with positioning pins 9, but more sets can be added as needed to improve positioning accuracy. All positioning holes 10 are spaced around the axis of the workpiece 12, and the sizes of different sets of positioning holes 10 can be configured differently to accommodate different sizes and shapes of hole portions. The positioning pins 9 can also have different cross-sectional shapes, such as hexagonal, cylindrical, etc.

[0037] The positioning holes 10 match the positions of the hole portions available for positioning on the workpiece 12, ensuring that the workpiece 12 can be accurately placed on the bearing surface 6. The positioning pins 9 and the positioning holes 10 are detachably connected, such as threaded connection or pin hole matching, to ensure that the positioning pins 9 are securely installed in the positioning holes 10.

[0038] As shown in Figure 1 and Figure 2 , before installing the workpiece 12, select the appropriate positioning pins 9 and corresponding sets of positioning holes 10 according to the positions and sizes of the hole portions on the workpiece 12; insert the positioning pins 9 into the positioning holes 10 to ensure that the positioning pins 9 are accurately aligned with the hole portions on the workpiece 12; place the workpiece 12 on the bearing surface 6 so that the hole portions on the workpiece 12 are matched with the positioning pins 9 to achieve preliminary positioning of the workpiece 12.

[0039] As shown in Figure 2 , the two ends of the pressing plate form a pressing surface 5, which is used to cooperate with the bearing surface 6 to form a clamping portion 2. The pressing plate can be provided with a pressing plate that forms the pressing surface 5, which can be made of rubber, plastic, etc., thereby reducing damage to the workpiece 12 caused by clamping the workpiece 12.

[0040] The telescopic member 3 serves as a driving member for the movement of the pressing plate, which can drive the movement of the pressing plate. The output end of the telescopic member 3 is connected between the pressing surfaces 5 at both ends of the pressing plate, and simultaneously drives the pressing surfaces 5 at both ends. The telescopic member 3 achieves the up and down movement of the pressing plate by telescopic action, changes the size of the clamping portion 2 formed by the pressing surface 5 and the bearing surface 6, and thereby clamps or releases the workpiece 12. The pressing surfaces 5 at both ends of the pressing plate can cooperate with the bearing surfaces 6 of different detection stations 11 to form multiple clamping portions 2, improving the flexibility of the clamp.

[0041] As shown in Figure 1 and Figure 2 , after the workpiece 12 is preliminarily positioned, the telescopic member 3 is started to move the pressing plate downward until the pressing surface 5 is tightly matched with the bearing surface 6 to form a clamping portion 2; adjust the telescopic amount of the telescopic member 3 according to the size and shape of the workpiece 12 to ensure that the workpiece 12 is stably clamped in the clamping portion 2.

[0042] The opening of one end of the detection hole 7 is located within the range of the bearing surface 6 corresponding to the clamping part 2, ensuring that the detection hole 7 is closely attached to the workpiece 12 to form an airtight detection area. The detection stations 11 are arranged in an array on the base body 1, which can maximize the use of the space of the base body 1, configure multiple detection stations 11 to simultaneously carry and clamp multiple workpieces 12, and improve the processing efficiency of the workpieces 12, while keeping the spacing of the detection stations 11 reasonable to avoid mutual interference.

[0043] The telescopic part 3 is located between two detection stations 11, ensuring that the pressing plate does not interfere with the detection hole 7 or the air pipe 8 when moving. The bearing surface 6 of each detection station 11 forms two spaced-apart clamping parts 2, which are located on the opposite sides of the axis of the clamped workpiece 12 and can clamp both sides of the workpiece 12 simultaneously, improving the clamping stability. Each clamping part 2 is respectively provided with a detection hole 7, which can perform airtightness detection after clamping the workpiece 12, for judging whether the workpiece 12 is clamped in place.

[0044] Each detection hole 7 is respectively connected with an air pipe 8, and an air pressure detection table is installed on the air pipe 8. The air pressure detection table is used to monitor the air pressure change in the detection hole 7 in real time, so as to judge whether the clamping of the workpiece 12 is qualified.

[0045] After the workpiece 12 is clamped, gas is injected into the detection hole 7 through the air pipe 8, so that an airtight area is formed between the detection hole 7 and the workpiece 12; observe the air pressure change on the air pressure detection table, if the air pressure remains stable, it means that the workpiece 12 is clamped in place and has good airtightness; if the air pressure decreases, it means that the workpiece 12 is not clamped tightly or there is a leak, which needs to be adjusted or checked.

[0046] Specifically, in work, as shown in Figure 1 and Figure 2 shown:

[0047] Workpiece 12 positioning: according to the position and size of the hole part on the workpiece 12, select appropriate positioning pins 9 and corresponding positioning holes 10 groups, place the workpiece 12 on the bearing surface 6, make the hole part on the workpiece 12 cooperate with the positioning pin 9, realize the preliminary positioning of the workpiece 12.

[0048] Workpiece 12 clamping: start the telescopic part 3, make the pressing plate move downward, until the pressing surface 5 tightly cooperates with the bearing surface 6, form the clamping part 2, stably clamp the workpiece 12 in the clamping part 2.

[0049] Airtightness detection: inject gas into the detection hole 7 through the air pipe 8, observe the air pressure change on the air pressure detection table, judge whether the workpiece 12 is clamped in place.

[0050] Workpiece 12 processing: after confirming that the workpiece 12 is clamped in place, start the processing equipment to process the workpiece 12, process the inner hole and the plane on the workpiece 12.

[0051] Workpiece 12 release: after processing is completed, the telescopic part 3 is started to move the pressing plate upwards to release the workpiece 12.

[0052] Through the above design and implementation, accurate positioning, stable clamping and air tightness detection of the workpiece 12 are realized, and the processing quality and efficiency are improved. At the same time, the overall structure design is reasonable, the reliability and durability of the clamp are improved, and the maintenance cost is reduced.

[0053] The above only describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fixture for CNC machining of internal hole planes, characterized in that, The utility model relates to a kind of detection device for workpiece, including: Base, is equipped with multiple detection stations, detection station is equipped with the bearing surface of carrying workpiece; Positioning pin, distributed in each detection station and installed to base, positioning pin one end protrudes from bearing surface, for cooperating with the hole part opened on workpiece; Pressing plate, by telescopic piece installation to base, pressing plate end forms the pressing surface towards bearing surface, and the clamping portion of bearing surface and pressing surface between forms containing workpiece; Detection hole, opened in base, detection hole one end opening is located in bearing surface, to fit workpiece is blocked by workpiece, the other end opening is connected by gas pipe to gas source, and each detection station corresponding detection hole is connected on the gas pipe of gas pressure detection table.

2. The jig for machining an inner hole plane of the CNC according to claim 1, wherein The bearing surface of each detection station is equipped with multiple sets of positioning holes, and the end of positioning pin away from the workpiece is installed in the positioning hole.

3. The jig for machining an inner hole plane of the CNC according to claim 2, wherein The same group of positioning holes is provided with two, and the two positioning holes in the same group are symmetrically distributed relative to the axis of the workpiece to be fitted, and at least one set of positioning holes of each detection station is fitted with a positioning pin.

4. The jig for machining an inner hole plane of a CNC according to claim 2 or 3, wherein All positioning holes are spaced apart around the axis of the workpiece fitted with the positioning pin, and the sizes of different sets of positioning holes are different.

5. The fixture for CNC machining of an inner hole plane according to claim 1, characterized in that, The pressing plate forms a pressing surface at both ends, respectively, and the output end of the telescopic piece is connected between the pressing surfaces at both ends of the pressing plate, and the pressing surfaces at both ends of the pressing plate cooperate with the bearing surfaces of different detection stations to form clamping portions, respectively.

6. The jig for machining an inner hole plane of the CNC according to claim 5, wherein The one end opening of the detection hole is located within the range of the bearing surface corresponding to the clamping portion.

7. The fixture for CNC machining of an inner hole plane according to claim 1, characterized in that, The telescopic piece is located between two detection stations.

8. The fixture for CNC machining of the inner hole flat surface according to claim 7, characterized in that, The bearing surface of each detection station forms two spaced-apart clamping portions, and the two clamping portions are located on the opposite sides of the axis of the clamped workpiece.

9. The jig for machining an inner hole plane of a CNC according to claim 7 or 8, wherein Each detection station forms two clamping portions, and each clamping portion is respectively provided with a detection hole.

10. The fixture for CNC machining of an inner hole plane according to claim 9, characterized in that, Each detection hole is respectively connected with a gas pipe, and a gas pressure detection table is installed on the gas pipe.

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