Transmission shell space hole system machining clamp

Abstract

The utility model relates to a clamp, in particular to a clamp for machining space hole systems of a transmission shell, which solves the problems of high machining cost and complicated machining process when two space hole systems with different angles on the outer surface of the conventional transmission shell are machined, and comprises a clamp body, the clamp body comprises a bottom plate and a vertical plate vertically arranged on the vertical bottom plate, and the front side and the back side of the vertical plate are each provided with at least two positioning pins used for being matched with positioning pin holes in the transmission shell to achieve positioning of the transmission shell; the front side and the back side of the vertical plate are each provided with a plurality of positioning blocks in a mirror symmetry mode, each side is provided with at least three positioning blocks, and the outer side end faces of the positioning blocks located on the same side are located in the same plane. The front side and the back side of the vertical plate are each provided with a plurality of clamping pieces in a mirror symmetry mode, at least two clamping pieces are arranged on each side, each clamping piece corresponds to one positioning block, and pressing plates of the clamping pieces are matched with the positioning blocks to be used for pressing the transmission shell.

Description

Technical Field

[0001] The utility model relates to a clamp, in particular to a clamp for machining space holes of a transmission housing. Background Art

[0002] In the automotive industry, AT hydraulic automatic transmissions have been widely used, and the application of high-torque AT automatic transmissions in heavy-duty vehicles and engineering machinery has gradually increased. In order to achieve lightweight transmissions, most AT transmission housings are currently made of aluminum alloy. Aluminum alloy transmission housings have high strength and excellent processing performance. Their outer surface can be processed with more and more complex structures to improve the performance of the transmission housing.

[0003] Existing transmission cases are usually processed by four-axis horizontal machining centers. Most transmission case outer surfaces are designed with two spatial hole systems with different three-dimensional angles. Due to the limitation of the processing capacity of the four-axis horizontal machining center, the two spatial hole systems cannot be processed at one time. This leads to the need to design a set of fixtures for each angle of spatial hole system in the early trial processing and small batch processing, and to match a four-axis horizontal machining center for the processing of the spatial hole system at that angle. This leads to a large number of machining centers being occupied during production, and the transmission case also needs to be transferred multiple times between machining centers. The machining process is cumbersome, and the production cost of making a set of fixtures for a spatial axis system at one angle is also high. If multiple sets of fixtures are not used, a five-axis machining center is required to achieve efficient processing of the spatial hole system. However, compared with the four-axis horizontal machining center commonly used at this stage, the initial investment cost of the five-axis machining center is too high.

[0004] The Chinese utility model patent with authorization announcement number CN216758282U discloses a device for processing spatial double-angle inclined holes of shell-type parts, including: a base, a positioning plate, a tool block, a positioning pin shaft, a positioning diamond pin shaft, a fastening shaft, and an alignment shaft; the base includes: a bottom plate, a vertical plate, a side plate, and a top plate; the bottom of the vertical plate is connected to the top of the bottom plate, the rear of the side plate is connected to the front of the vertical plate, the top plate is connected to the top of the side plate, and the tool block is connected to the top of the top plate; one end of the positioning pin shaft is installed in the fifth pin shaft mounting hole and the second pin shaft mounting hole; one end of the alignment shaft is connected to the outer wall of the positioning pin shaft, the front end of the positioning diamond pin shaft is provided with a diamond end head, and the rear end is installed in the fourth pin shaft mounting hole and the first pin shaft mounting hole; the rear end of the fastening shaft is installed in the sixth pin shaft mounting hole and the third pin shaft mounting hole. The utility model solves the difficult problems of clamping and measuring in the processing of spatial double-angle holes on shell parts, but its structure is relatively complex and the manufacturing cost is high. There are still technical problems such as high processing cost and complicated processing process. Utility Model Content

[0005] The utility model aims to solve the technical problems that the processing cost is high and the processing process is complicated when processing two spatial hole systems with different angles on the outer surface of the existing transmission housing, and provides a transmission housing spatial hole system processing fixture.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A transmission housing space hole processing fixture, characterized by comprising a clamp body, a positioning pin, a positioning block and a clamping piece;

[0008] The clamp body comprises a bottom plate and a vertical plate vertically arranged on the bottom plate;

[0009] There are multiple positioning pins, which are respectively arranged on the front side and the back side of the vertical plate, and at least two are arranged on each side, which are used to cooperate with the positioning pin holes on the transmission housing to realize the positioning of the transmission housing;

[0010] There are multiple positioning blocks, which are respectively arranged on the front side and the back side of the vertical plate in a mirror-symmetrical manner, with at least three being arranged on each side, and the outer end surfaces of the positioning blocks on the same side are in the same plane;

[0011] There are multiple clamping parts, which are respectively arranged on the front side and the back side of the vertical plate in a mirror-symmetrical manner, with at least two arranged on each side. Each clamping part is respectively arranged corresponding to a positioning block. Each clamping part includes a connecting column arranged on the vertical plate and a pressure plate connected to the connecting column. A nut is connected to one end of the connecting column, and the nut abuts against the outer surface of the pressure plate. The pressure plate and the positioning block are used to clamp the transmission housing.

[0012] Furthermore, the positioning blocks include a first positioning block, a second positioning block, a third positioning block and a fourth positioning block arranged on the front side of the vertical plate, and the centers of the four are distributed in a circle; a fifth positioning block, a sixth positioning block, a seventh positioning block and an eighth positioning block are respectively arranged on the back side of the vertical plate in a mirror-symmetrical manner.

[0013] Furthermore, there are four locating pins, two of which are front diamond locating pins arranged at the lower right of the first locating block and front cylindrical locating pin arranged at the upper left of the third locating block, and the two are respectively used to cooperate with two locating pin holes on a transmission housing so that the axis of the A hole system on the transmission housing is parallel to the upper surface of the base plate; the other two are rear diamond locating pins arranged at the upper right of the fifth locating block and the rear cylindrical locating pin arranged at the lower left of the seventh locating block, and the two are respectively used to cooperate with two locating pin holes on another transmission housing so that the axis of the B hole system on the transmission housing is parallel to the upper surface of the base plate.

[0014] Furthermore, the vertical plate is arranged in the middle of the bottom plate, and a plurality of reinforcing ribs are arranged on both sides of the vertical plate, one end of the reinforcing rib is connected to the vertical plate, and the other end is connected to the bottom plate.

[0015] Furthermore, four clamping members are provided, two of which are respectively provided corresponding to the second positioning block and the fourth positioning block, and the other two are respectively provided corresponding to the sixth positioning block and the eighth positioning block.

[0016] Furthermore, the connecting column is a double-headed stud, one end of which is connected to the threaded hole on the vertical plate, and the other end is connected to the nut after passing through the long slot opened on the clamping plate.

[0017] Furthermore, a weight-reducing hole is provided on the vertical plate, and the weight-reducing hole is located at the center of the first positioning block, the second positioning block, the third positioning block and the fourth positioning block.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] (1) The utility model provides a transmission case spatial hole processing fixture, in which a plurality of clamping members and positioning blocks are respectively arranged in mirror symmetry on the front side and the back side of the clamping body, at least two clamping members and two positioning blocks are arranged on each side, and the outer end faces of the positioning blocks on the same side are in the same plane. Each clamping member is arranged corresponding to a positioning block, and a plurality of positioning pins are arranged on the front side and the back side of the vertical plate, and at least two positioning pins are arranged on each side. The overall structure is simple. In this way, the transmission case can be clamped on both sides of the vertical plate. After clamping once, two spatial hole systems can be processed by matching the positioning pins with the positioning pin holes. After one hole system is processed, it is not necessary to transfer the transmission case back and forth between different four-axis horizontal machining centers to process the remaining hole systems. Instead, the two transmission cases are exchanged and clamped to the two sides of the vertical plate for a second time to complete the processing of the remaining hole systems. The processing process is simplified, and the processing of two spatial hole systems on the transmission case can be realized by a set of fixtures, saving processing costs.

[0020] (2) The utility model provides a transmission case space hole system processing fixture in which a long groove is provided on the clamping plate. This is because there may be processing errors when the transmission case is processed, and there may also be installation errors when it is clamped on the fixture. If the length of the clamping plate is not adjustable, when all the errors accumulate, it may cause the clamping plate to be unable to clamp the transmission case. Therefore, a long groove is provided on the clamping plate to make the length of the clamping plate adjustable, thereby improving the flexibility of the clamping part.

[0021] (3) The utility model provides a transmission housing space hole system processing fixture with four clamping parts, two of which correspond to the second positioning block and the fourth positioning block respectively, and the other two correspond to the sixth positioning block and the eighth positioning block respectively. Because the clamping force required for processing the hole system is not very large, four clamping parts can meet the clamping requirements of the two transmission housings on both sides of the vertical plate, and no additional clamping parts are required, which can save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The three-dimensional structure of the embodiment of the machining fixture for the space hole system of the transmission housing of the utility model is shown in FIG. Figure 1 ;

[0023] Figure 2 The three-dimensional structure of the embodiment of the machining fixture for the space hole system of the transmission housing of the utility model is shown in FIG. Figure 2 ;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of a transmission case clamped by an embodiment of the transmission case space hole processing fixture of the utility model;

[0025] Figure 4 It is a schematic diagram of an embodiment of a machining fixture for a space hole system of a transmission housing of the utility model in use.

[0026] The following are the descriptions of the reference numerals:

[0027] 1-vertical plate, 11-weight reduction hole; 2-bottom plate; 3-locating pins, 31-front diamond locating pins, 32-front cylindrical locating pins, 33-reverse diamond locating pins, 34-reverse cylindrical locating pins; 4-locating blocks, 41-first locating block, 42-second locating block, 43-third locating block, 44-fourth locating block, 45-fifth locating block, 46-sixth locating block, 47-seventh locating block, 48-eighth locating block; 5-clamping piece, 51-connecting column, 52-pressure plate; 6-reinforcement ribs; 7-transmission housing, 71-A hole system, 72-B hole system. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] Reference Figure 1-Figure 4The utility model discloses a transmission housing space hole processing fixture, comprising a clamp body, a positioning pin 3, a positioning block 4 and a clamping piece 5. The clamp body comprises a bottom plate 2 and a vertical plate 1 vertically arranged on the bottom plate 2, and the vertical plate 1 is arranged in the middle position of the bottom plate 2, so that a T-shaped clamp body is formed. The overall center of gravity is located in the middle position of the bottom plate 2, and the transmission housing 7 can be clamped to maintain stability. In order to further strengthen the structural strength of the clamp body, a plurality of reinforcing ribs 6 are arranged on both sides of the vertical plate 1, and one end of the reinforcing rib 6 is connected to the vertical plate 1, and the other end is connected to the bottom plate 2.

[0030] In order to position the transmission housing 7 , the fixture as a whole adopts a positioning structure of “one side and two pins”, wherein the “one side” is the outer end face of the positioning block 4 , and the “two pins” are the positioning pins 3 .

[0031] In order to meet the positioning requirement of "one side", at least three positioning blocks 4 are arranged on each side to ensure that the end face of the transmission housing 7 is firmly abutted against the outer end face of the positioning block 4. In this embodiment, a total of eight positioning blocks 4 are arranged, and the structure is the same, and four are arranged on each side, namely the first positioning block 41, the second positioning block 42, the third positioning block 43, and the fourth positioning block 44 arranged on the front side of the vertical plate 1. The centers of the four are distributed in a circle and the outer end faces of the four are located in the same plane; the fifth positioning block 45, the sixth positioning block 46, the seventh positioning block 47, and the eighth positioning block 48 are respectively arranged on the reverse side of the vertical plate 1 in a mirror-symmetrical manner. The centers of the four are also distributed in a circle and the outer end faces of the four are located in the same plane; in this way, when the end faces of the transmission housing 7 clamped on the front and back sides of the vertical plate 1 contact with the outer end faces of the positioning blocks 4, it can be ensured that the transmission housing 7 will not tilt, thereby ensuring the processing accuracy.

[0032] In order to meet the positioning requirement of "two pins", at least two positioning pins 3 are provided on each side. In this embodiment, a total of four positioning pins 3 are provided, two of which are respectively provided at the front diamond positioning pin 31 at the lower right of the first positioning block 41 and the front cylindrical positioning pin 32 at the upper left of the third positioning block 43; the other two are respectively provided at the upper right of the fifth positioning block 45 and the reverse cylindrical positioning pin 34 at the lower left of the seventh positioning block 47. The structure of the clamped transmission housing 7 is as shown in FIG. Figure 3 As shown, the A hole system 71 and the B hole system 72 arranged on its outer surface are at different positions, and their three-dimensional angles are also different. By cooperating with the positioning pin holes on the transmission housing 7 through the "two pins" at different positions on both sides of the vertical plate 1, the axes of the two hole systems can be made parallel to the upper surface of the base plate 2, thereby realizing the positioning of the transmission housing 7 and facilitating processing by a four-axis horizontal machining center.

[0033] The clamping member 5 includes a connecting column 51 connected to the vertical plate 1 and a pressure plate 52 connected to the connecting column 51, wherein the connecting column 51 is a double-headed stud, one end of which is connected to the threaded hole on the vertical plate 1, and the other end is connected to a nut after passing through a long slot opened on the pressure plate 52. The nut abuts against the outer surface of the pressure plate 52, and the clamping force can be adjusted by the nut, and the long slot opened on the pressure plate 52 can also adjust the length of the pressure plate 52. Because the transmission housing 7 has a processing error, there will also be an installation error when clamped on the fixture. The adjustable length of the pressure plate 52 will enhance the flexibility of use of the clamping member 5. In order to ensure the clamping requirements of the transmission housing 7, at least two clamping members 5 are arranged on each side of the vertical plate 1, and each clamping member 5 is respectively arranged corresponding to a positioning block 4. In this embodiment, a total of four clamping members 5 are arranged, of which two clamping members 5 are respectively arranged corresponding to the second positioning block 42 and the fourth positioning block 44, and the other two clamping members 5 are respectively arranged corresponding to the sixth positioning block 46 and the eighth positioning block 48. In this way, the pressure plate 52 of the clamping member 5 cooperates with the corresponding positioning block 4 to clamp the transmission housing 7. The clamping member 5 is not arranged on each positioning block 4 because the clamping force required for processing the hole system is not large. Four clamping members 5 are sufficient to meet the clamping requirements of the transmission housing 7 on the positive and reverse sides of the vertical plate 1. Fewer clamping members 5 can save manufacturing costs.

[0034] In order to reduce the overall weight of the clamp, a weight-reducing hole 11 is further provided on the vertical plate 1. The weight-reducing hole 11 is located at the center of the first positioning block 41, the second positioning block 42, the third positioning block 43 and the fourth positioning block 44. Similarly, the weight-reducing hole 11 is also located at the center of the fifth positioning block 45, the sixth positioning block 46, the seventh positioning block 47 and the eighth positioning block 48. Because the entire clamp needs to clamp two transmission housings 7, its structural strength is of vital importance. Therefore, in order to reduce its own weight without weakening the structural strength, only one weight-reducing hole 11 is provided.

[0035] When using, Figure 4As shown, the two transmission housings 7 are clamped to the front and back sides of the vertical plate 1 respectively, the positioning pins 3 are inserted into the positioning pin holes on the transmission housing 7, and the end faces of the transmission housing 7 are abutted against the outer end faces of the positioning blocks 4, and then the two transmission housings 7 are fixed by the clamping members 5, and then the whole set of fixtures is installed on the workbench of the four-axis horizontal machining center. At this time, the A hole system 71 of the transmission housing 7 arranged on the side of the first positioning block 41 is parallel to the upper surface of the bottom plate 2, and the B hole system 72 of the transmission housing 7 arranged on the side of the fifth positioning block 45 is parallel to the upper surface of the bottom plate 2, and the machining center is started, and the B axis of the four-axis horizontal machining center is rotated by an angle of α to start machining at the first positioning block. The A hole system 71 with an angle of X on one side of the block 41; after the processing is completed, the B axis of the four-axis horizontal machining center rotates at an angle of β to start processing the B hole system 72 with an angle of Y on one side of the fifth positioning block 45; when the two hole systems are all processed, the two transmission housings 7 are removed, and the two transmission housings 7 are exchanged and clamped on both sides of the vertical plate 1 respectively, and then the subsequent hole system processing is carried out. During the entire processing process, only one traditional four-axis horizontal machining center and a set of fixtures are used to process the two spatial hole systems on the transmission housing 7, which reduces the processing cost, and the transmission housing 7 does not need to be transferred between different four-axis horizontal machining centers, and the processing process is simplified.

[0036] The embodiments described above are merely descriptions of the specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A transmission housing space hole processing fixture, characterized by: It comprises a clamp body, a positioning pin (3), a positioning block (4) and a clamping member (5); The clamp body comprises a bottom plate (2) and a vertical plate (1) vertically arranged on the bottom plate (2); There are a plurality of positioning pins (3), which are respectively arranged on the front side and the back side of the vertical plate (1), with at least two being arranged on each side, and are used to cooperate with the positioning pin holes on the transmission housing (7) to achieve the positioning of the transmission housing (7); There are multiple positioning blocks (4), which are respectively arranged on the front side and the back side of the vertical plate (1) in a mirror-symmetrical manner, with at least three being arranged on each side, and the outer end surfaces of the positioning blocks (4) on the same side are in the same plane; The clamping members (5) are multiple and are respectively arranged on the front side and the back side of the vertical plate (1) in a mirror-symmetrical manner, with at least two being arranged on each side. Each clamping member (5) is respectively arranged corresponding to a positioning block (4). Each clamping member (5) comprises a connecting column (51) arranged on the vertical plate (1) and a pressure plate (52) connected to the connecting column (51). A nut is connected to one end of the connecting column (51), and the nut abuts against the outer surface of the pressure plate (52). The pressure plate (52) cooperates with the positioning block (4) to press the transmission housing (7).

2. The transmission housing space hole processing fixture according to claim 1 is characterized in that: The positioning blocks (4) comprise a first positioning block (41), a second positioning block (42), a third positioning block (43) and a fourth positioning block (44) arranged on the front side of the vertical plate (1), and the centers of the four positioning blocks are distributed in a circle; a fifth positioning block (45), a sixth positioning block (46), a seventh positioning block (47) and an eighth positioning block (48) are arranged on the reverse side of the vertical plate (1) in a mirror-symmetrical manner.

3. The transmission housing space hole processing fixture according to claim 2 is characterized in that: Four positioning pins (3) are provided, two of which are a front rhombus positioning pin (31) provided at the lower right of the first positioning block (41) and a front cylindrical positioning pin (32) provided at the upper left of the third positioning block (43), and the two are respectively used to cooperate with two positioning pin holes on a transmission housing (7) so that the axis of the A hole system (71) on the transmission housing (7) is parallel to the upper surface of the bottom plate (2); the other two are a reverse rhombus positioning pin (33) provided at the upper right of the fifth positioning block (45) and a reverse cylindrical positioning pin (34) provided at the lower left of the seventh positioning block (47), and the two are respectively used to cooperate with two positioning pin holes on another transmission housing (7) so that the axis of the B hole system (72) on the transmission housing (7) is parallel to the upper surface of the bottom plate (2).

4. The transmission housing space hole processing fixture according to claim 3 is characterized in that: The vertical plate (1) is arranged in the middle of the bottom plate (2), and a plurality of reinforcing ribs (6) are arranged on both sides of the vertical plate (1), one end of the reinforcing rib (6) is connected to the vertical plate (1), and the other end is connected to the bottom plate (2).

5. The transmission housing space hole processing fixture according to claim 4 is characterized in that: Four clamping members (5) are provided, of which two clamping members (5) are respectively provided corresponding to the second positioning block (42) and the fourth positioning block (44), and the other two are respectively provided corresponding to the sixth positioning block (46) and the eighth positioning block (48).

6. The transmission housing space hole processing fixture according to claim 5 is characterized in that: The connecting column (51) is a stud, one end of which is connected to the threaded hole on the vertical plate (1), and the other end of which passes through the long slot provided on the pressing plate (52) and is connected to the nut.

7. The transmission housing space hole processing fixture according to claim 6, characterized in that: A weight-reducing hole (11) is provided on the vertical plate (1), and the weight-reducing hole (11) is located at the center of the first positioning block (41), the second positioning block (42), the third positioning block (43) and the fourth positioning block (44).

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