Manufacturing process of electric hammer bracket

Abstract

This invention discloses a processing technology for an electric hammer bracket, comprising the following steps: 1) precision casting of the blank; 2) using the contour as a positioning datum; 3) sequentially machining end face A, the first bearing position, the first sealing position, and the housing position; 4) machining four positioning holes using a multi-hole drill; 6) using the four positioning holes as positioning datums; 7) sequentially machining the second sealing position, the second bearing position, and the bushing position. By using a single positioning datum, the negative impact of accumulated errors is fundamentally eliminated. While meeting the requirements for normal use of the electric hammer, the machining accuracy requirements of each machining position can be appropriately relaxed, thereby reducing the manufacturing cost of the electric hammer; or, without relaxing the machining accuracy of each machining position, the fit between the various components of the electric hammer can achieve higher precision, resulting in a high-quality electric hammer with low noise, energy saving, and a longer service life.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and more specifically, to a processing technology for an electric hammer bracket. Background Technology

[0002] Current hammer drill support manufacturing processes typically involve sequential machining according to the drawings, lacking a unified positioning benchmark. Even the four positioning holes are machined separately by a drilling machine. Multiple positioning benchmarks inevitably lead to the accumulation of machining errors between sequentially machined positions. We know that the hammer drill support is the connecting bridge between the head shell and the machine housing, the site where electrical energy is converted into mechanical energy, and it bears various loads and impact forces during the transformation from rotation to hammering function. Therefore, the manufacturing process and precision of the hammer drill support are crucial to the quality of the hammer, as it is a core component. Since the hammer drill motor rotates at tens of thousands of revolutions per minute, if the accumulated errors during manufacturing cannot be controlled within a reasonable range, it will generate severe vibration and wear, produce significant noise, and seriously affect the hammer's lifespan. To control the accumulated errors during hammer drill manufacturing within a reasonable range, the machining precision of each machining position must be significantly increased, inevitably leading to a substantial increase in the manufacturing cost. Summary of the Invention

[0003] To overcome the above-mentioned defects, the technical problem to be solved by the present invention is to provide a processing technology for an electric hammer bracket, which can appropriately relax the processing accuracy requirements of each processing position while meeting the requirements for normal use of the electric hammer, thereby significantly reducing the manufacturing cost of the electric hammer.

[0004] The technical solution of this invention to solve the problems existing in the prior art is: a processing technology for an electric hammer bracket, the processing technology including the following steps:

[0005] 1) The support blank is made by precision casting of metal materials;

[0006] 2) Fix the support blank on the machining equipment using the outline as the positioning reference;

[0007] 3) The end face A of the bracket, the housing position, the first bearing position, and the first sealing position are processed sequentially by removing material;

[0008] 4) Use a multi-hole drill to simultaneously machine the four positioning holes of the bracket;

[0009] 6) Fix it on the machining equipment using the four positioning holes as positioning references;

[0010] 7) The second sealing position, the second bearing position, and the bushing position that match the bracket and the electric hammer head shell are machined in sequence by removing material.

[0011] Although the technical solution of this invention has two positioning references, since the four positioning holes serving as the second positioning reference are machined simultaneously with end face A, housing position, first bearing position, and first sealing position, it can be considered equivalent to machining end face A, housing position, first bearing position, and first sealing position under the reference of the four positioning holes. Furthermore, the four positioning holes are machined in one operation using a multi-hole drill, so the machining tolerance of the four positioning holes serving as positioning references can be reliably guaranteed by equipment such as multi-hole drills. The subsequent second sealing position, second bearing position, and bushing position are all machined under the positioning reference of the four positioning holes. Based on the above, each machining position of the electric hammer bracket in the technical solution of this invention is machined under the positioning reference of the four positioning holes. Therefore, there is no cumulative error between each machining position of the electric hammer bracket and the four positioning holes. Thus, as long as the tolerance of each machining position is reasonable, the overall error can be controlled within a reasonable range, thereby reducing the vibration and noise of the electric hammer, reducing wear, and extending the service life of the electric hammer. In other words, under the premise of the same quality of electric hammer, the manufacturing cost of the electric hammer can be reduced.

[0012] Preferably, the multi-hole drill includes a tool holder, one end of which is equipped with a gearbox, and the other end of which is provided with an outer turning cutter, an inner turning cutter, and a grooving cutter in sequence from the inside out. The output end of the gearbox is provided with drill bits that mate with the four positioning holes of the bracket. The gearbox output shaft is equipped with four drill bits that mate with the positioning holes of the bracket, allowing the four positioning holes to be machined in one operation. This not only ensures reliable positional accuracy between the four positioning holes but also significantly improves work efficiency and reduces manufacturing costs. The other end of the tool holder, with the outer turning cutter, inner turning cutter, and grooving cutter in sequence from the inside out, allows for simultaneous machining of end face A, the housing position, the first bearing position, the first sealing position, and the four positioning holes in a single clamping and positioning operation. This not only improves positional accuracy between the machining positions but also significantly improves work efficiency and reduces manufacturing costs.

[0013] Preferably, the machining tolerance of the first bearing seat is 0~0.021mm, the surface roughness is 0.8μm, the coaxiality tolerance with the housing is 0.02mm, and the perpendicularity tolerance with the end face A of the bracket is 0.035mm. The first bearing seat is used to install the first bearing that is fixedly connected to the motor output shaft. Since the electric hammer motor rotates at speeds of tens of thousands of revolutions per minute, even without error accumulation, high positional accuracy is required to ensure that the power output by the motor is converted into effective working kinetic energy as much as possible, and to minimize vibration energy and noise.

[0014] Preferably, the machining tolerance of the first sealing position is ±0.05mm, and the surface roughness is 3.2μm. The first sealing position is used to install the first sealing ring between the first bearing position and the first bearing. The first sealing ring not only needs to withstand the huge pressure difference generated by the rapid back-and-forth movement of the cylinder, but also needs to withstand the sealing caused by the liquefaction of grease by the huge pressure. This is an important part of preventing oil leakage in the electric hammer. Therefore, even without the accumulation of errors, appropriate positional accuracy is required to ensure that the electric hammer does not leak oil.

[0015] Preferably, the machining tolerance of the housing position is 0~0.05mm, and the surface roughness is 3.2μm. The housing position is used for the connection between the bracket and the housing, which is related to the interconnection accuracy between the motor and various mechanical power transmission mechanisms inside the electric hammer, and determines the power transmission efficiency between the motor and various mechanical power transmission mechanisms. Even without error accumulation, appropriate positional accuracy is required to ensure efficient power transmission between the motor and various mechanical power transmission mechanisms.

[0016] Preferably, the machining tolerance of the second sealing position is 0~0.1mm, and the surface roughness is 3.2μm. The second sealing position is used for the connection between the mounting bracket and the head shell. The second sealing ring not only needs to withstand the huge pressure difference generated by the rapid back and forth movement of the cylinder, but also needs to withstand the sealing caused by the liquefaction of grease by the huge pressure. This is also an important part of preventing oil leakage in the electric hammer. Therefore, the second sealing position also needs appropriate positional accuracy even without error accumulation to ensure that the electric hammer does not leak oil.

[0017] Preferably, the machining tolerance of the second bearing seat is 0.02~0.04mm, the surface roughness is 0.8μm, and the parallelism tolerance with the housing axis is 0.035mm. The second bearing seat is used to install the rocker arm bearing, which houses an intermediate shaft and a helical gear. The positional accuracy of the intermediate shaft affects the transmission accuracy of the large gear, and the positional accuracy of the helical gear also affects the transmission accuracy of the motor gear shaft. Therefore, even without error accumulation, the second bearing seat requires high positional accuracy to ensure efficient power transmission between the motor and various mechanical power transmission mechanisms, and to minimize vibration energy and noise.

[0018] Preferably, the machining tolerance of the bushing position is ±0.01mm, and the surface roughness is 0.8μm. The bushing position is used to install the bracket bushing. A connecting rotating sleeve is sleeved inside the bracket bushing, and a large gear is sleeved outside the connecting rotating sleeve. A cylinder is sleeved inside the connecting rotating sleeve. The cylinder is associated with the piston, hammer rod, etc. Therefore, even without error accumulation, the bushing position still needs appropriate positional accuracy to ensure high efficiency of the electric hammer drill and smooth power transmission.

[0019] Beneficial effects: Since the present invention adopts a technical solution with only one positioning reference, it fundamentally eliminates the negative impact of accumulated errors. Under the condition of meeting the normal use of the electric hammer, the machining accuracy requirements of each machining position can be appropriately relaxed, thereby significantly reducing the manufacturing cost of the electric hammer. In other words, without relaxing the machining accuracy of each machining position, the cooperation between the various parts of the electric hammer can achieve higher precision, thereby obtaining a high-quality electric hammer with low noise, energy saving and longer service life. Attached Figure Description

[0020] Figure 1 This is a cross-sectional schematic diagram of the bracket in this invention;

[0021] Figure 2 This is a left-side view of the bracket in this invention;

[0022] Figure 3 This is a three-dimensional schematic diagram of the multi-hole drill holder in this invention.

[0023] In the diagram: guide position 1, housing position 2, outline 3, second sealing position 4, bushing position 5, second bearing position 6, end face A7, first bearing position 8, first sealing position 9, wind baffle position 10, positioning hole 11, drill bit 12, gearbox 13, wide-blade finishing knife 14, internal hole knife 15, end face knife 16, tool holder 17. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0025] An embodiment of the manufacturing process for an electric hammer bracket is shown in the figure. The manufacturing process includes the following steps:

[0026] 1) The support blank is made by precision casting of metal materials;

[0027] 2) Fix the support blank on the machining equipment using the outline 3 as the positioning reference;

[0028] 3) The end face A7 of the bracket, housing position 2, first bearing position 8, first sealing position 9, guide position 1, and baffle position 10 are machined sequentially by material removal, wherein: the machining tolerance of the housing position 2 is 0~0.05mm, and the roughness is 3.2μm; the machining tolerance of the first bearing position 8 is 0~0.021mm, the roughness is 0.8μm, the coaxiality tolerance with the housing position 2 is 0.02mm, and the perpendicularity tolerance with the end face A7 of the bracket is 0.035mm; the machining tolerance of the first sealing position 9 is ±0.05mm, and the roughness is 3.2μm; the machining tolerance of the distance between the baffle position 10 and the end face A7 of the bracket is 0~0.1mm, and the roughness is 3.2μm.

[0029] 4) Use a multi-hole drill to simultaneously machine the four positioning holes 11 of the bracket;

[0030] 6) Fix it on the machining equipment using the four positioning holes 11 as positioning references;

[0031] 7) The second sealing position 4, the second bearing position 6, and the bushing position 5, which are matched with the electric hammer head shell, are processed sequentially by removing material. The machining tolerance of the second sealing position 4 is 0~0.1mm and the roughness is 3.2μm; the machining tolerance of the second bearing position 6 is 0.02~0.04mm and the roughness is 0.8μm, and the parallelism tolerance with the axis of the housing position 2 is 0.035mm; the machining tolerance of the bushing position 5 is ±0.01mm and the roughness is 0.8μm.

[0032] The multi-hole drill mentioned in step 4) includes a tool holder 17. One end of the tool holder 17 is provided with a gearbox 13. The other end of the tool holder 17 is provided with an end face cutter 16, an inner hole cutter 15, and a wide-blade finishing cutter 14 from the inside out. The output end of the gearbox 13 is provided with a drill bit 12 that matches the four positioning holes 11 of the bracket.

[0033] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

[0034] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A processing method for an electric hammer support, the electric hammer support comprising a guide position, a housing position, a second sealing position, a first bearing position, and an end face A and a wind baffle position arranged concentrically with respect to the axial direction of the electric hammer support; the electric hammer support further comprising a bushing position, a second bearing position, and four positioning holes; the axes of the bushing position and the second bearing position are located on the plane of symmetry of the four positioning holes, characterized in that... The machining equipment used for processing electric hammer supports is equipped with a multi-hole drill. The multi-hole drill includes a tool holder, one end of which is equipped with a gearbox. The other end of the tool holder is provided with an external turning cutter, an internal turning cutter, and a grooving cutter in sequence from the inside to the outside. The output end of the gearbox is equipped with drill bits that match the four positioning holes of the support. The processing technology includes the following steps: 1) The support blank is made by precision casting of metal materials; 2) Fix the support blank on the machining equipment using the outline as the positioning reference; 3) The end face A, housing position, first bearing position, first sealing position, guide position, and wind baffle position of the bracket are processed sequentially by removing material; 4) Use a multi-hole drill to simultaneously machine the four positioning holes of the bracket; 6) Fix it on the machining equipment using the four positioning holes as positioning references; 7) The second sealing position, the second bearing position, and the bushing position that match the bracket and the electric hammer head shell are machined in sequence by removing material.

2. The processing technology of the electric hammer bracket according to claim 1, characterized in that, The machining tolerance of the first bearing position is 0~0.021mm, the roughness is 0.8μm, the coaxiality tolerance with the housing position is 0.02mm, and the perpendicularity tolerance with the end face A of the bracket is 0.035mm.

3. The processing technology of the electric hammer bracket according to claim 1, characterized in that, The machining tolerance of the first sealing position is ±0.05mm, and the surface roughness is 3.2μm.

4. The processing technology of the electric hammer bracket according to claim 1, characterized in that, The machining tolerance of the housing part is 0~0.05mm, and the surface roughness is 3.2μm.

5. The processing technology of the electric hammer bracket according to claim 1, characterized in that, The machining tolerance of the second sealing position is 0~0.1mm, and the surface roughness is 3.2μm.

6. The processing technology of the electric hammer bracket according to claim 1, characterized in that, The machining tolerance of the second bearing position is 0.02~0.04mm, the surface roughness is 0.8μm, and the parallelism tolerance with the axis of the housing position is 0.035mm.

7. The processing technology of the electric hammer bracket according to claim 1, characterized in that, The machining tolerance of the bushing position is ±0.01mm, and the surface roughness is 0.8μm.

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